tfhjj632
- Создано: 16-03-22
- Последний вход: 16-03-22
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The light can be used in commercial
Описание: The light can be used in commercial Galvanized Light Fixtures, this upscale traditional style fixture can be used on the outside of any home to beautify a porch, deck, patio, garage and more. The anti-flicker high grade Dusk to Dawn photocell automatically turns light on at dusk and turns off the next morning. Simply install it, turn the switch on, and leave it to do its job. This fixture contains a standard medium base (E26) socket and can be adapted to use several styles of light bulbs according to the light and style needs required. It is built to last with reliable quality and a great mix of decorative and functional features such as stainless steel or solid brass mounting hardware and moisture blocking rubber washers. This fixture includes everything you need for a new or to replace an existing light fixture including mounting bracket, junction box screws, corrosion resistant fixture mounting screws and wire nuts. Easy to Install, each fixture comes with full illustrated instructions, making it easy to install for most DIY customers. The light can be used in commercial areas, residential areas, scenic spots, parks, squares, etc. It can also be used in heavy industrial environments such as marine lighting and external effects. And this kind of light has strong adhesion, heat and cold resistance, clean and environmentally friendly, good safety, stable chemical functions of the raw materials, no harm to the human body. It has anti-rust and oxidation resistance, acid and alkali resistance, and excellent intergranular corrosion resistance. It can be used with confidence in any place and environment. Good quality outdoor wall lights will allow you to extend the time you can spend outside. They also help to improve security by making it harder for thieves to enter your garden undetected. LED Garden Wall Lights are available in a vast array of styles and finishes, with a number of designs also available with built in security sensors. The combination of PC lampshade and aluminum makes the lamps unique, elegant and sophisticated. Apply PC lampshade to make the light softer, warmer, and protect the eyes. black outdoor lights wall mounted can be applied to unused places, and it is green and environmentally friendly, that is, no heat and no radiation. Using LED light source, compared with incandescent lamps of the same brightness, black outdoor lights wall mounted can save about 80% of electricity. High efficiency, energy saving, environmental protection, recyclable, sturdy and durable, high color temperature, superior color rendering, natural light, no flicker, no glare. In addition to the above, this light is also suitable for anywhere lighting is required. Outdoor Lawn Lights or garden lighting refers to lights that use outdoor lighting to illuminate private gardens and public landscapes; for the enhancement and purposes of safety, nighttime aesthetics, accessibility, security, recreation and sports, and social and event uses. Light pollution exacerbated by excessive, misdirected or obtrusive use of light, but even carefully used light fundamentally alters natural conditions. As a major side-effect of urbanization, it is blamed for compromising health, disrupting ecosystems and spoiling aesthetic environments. The public landscape and gardens have been illuminated for as long as interior structures have – for beauty, security, circulation, and social occasions; since ancient times by firelight from wood, candles, and animal-plant oil fells in torches, sconces and lanterns. Since the 17th century's introductions of new interior illumination fuels, the technology has then been used outdoors and in gardens. As systems were developed for power delivery, Gas lighting of the 19th century and electric light of the 20th century became part of exterior functioning and design. Conventionally generated and sourced electricity remains the most used source for landscape lighting in the early twenty-first century. With the combination of increasing demand for more efficient lighting, increasing availability of sustainable designs, global warming considerations, and aesthetic and safety concerns in garden and landscape design the methods and equipment of outdoor illumination have been evolving. The increasing use of LEDs, solar power, low voltage fixtures, energy efficient lamps, and energy-saving lighting design are examples of innovation in the field. The lights suitable for beautification and lighting decoration in residential communities or public places. Using galvanized or spray paint technology, safe and reliable, energy-saving and environmentally friendly, strong and durable anti-oxidation. This kind of light not only play a lighting effect, bring people a safe and convenient night, but also play a very good green landscape. The soft lighting does not irritate the eyes, but also brings illumination. It can also create a different color atmosphere for the surrounding plants, creating a more eye-catching and beautiful picture, and becoming a beautiful scenery in the city.
Дата Публикации: 16-03-22
For example
Описание: For example A vitamin is an organic molecule (or a set of molecules closely related chemically, i.e. vitamers) that is an essential micronutrient which an organism needs in small quantities for the proper functioning of its metabolism. Essential nutrients cannot be synthesized in the organism, either at all or not in sufficient quantities, and therefore must be obtained through the diet. Vitamin C can be synthesized by some species but not by others; it is not a vitamin in the first instance but is in the second. The term vitamin does not include the three other groups of essential nutrients: minerals, essential fatty acids, and essential amino acids. Most vitamins are not single molecules, but groups of related molecules called vitamers. For example, there are eight vitamers of vitamin E: four tocopherols and four tocotrienols. Some sources list fourteen vitamins, by including choline, but major health organizations list thirteen: vitamin A (as all-trans-retinol, all-trans-retinyl-esters, as well as all-trans-beta-carotene and other provitamin A carotenoids), vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B3 (niacin), vitamin B5 (pantothenic acid), vitamin B6 (pyridoxine), vitamin B7 (biotin), vitamin B9 (folic acid or folate), vitamin B12 (cobalamins), vitamin C (ascorbic acid), vitamin D (calciferols), vitamin E (tocopherols and tocotrienols), and vitamin K (phylloquinone and menaquinones). A veterinary drug (also animal drug) refers to a drug intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease in animals. Veterinary drugs can be roughly classified into four categories: ① general disease control drugs; ② infectious disease control drugs; ③ internal and external parasitic disease control drugs; ④ (including growth-promoting drugs). Except for biochemical immune products (bacteria, vaccines, serums, antitoxins and toxoids, etc.) for the prevention and treatment of infectious diseases, and special veterinary drugs such as special parasitic drugs for livestock and poultry and growth-promoting drugs, the rest are the same as those for human use, but the dosage , dosage forms and specifications are different. It has long been widely used to control livestock and poultry diseases. Sweetening agent are food additives that impart sweetness to soft drinks. It can be divided into nutritive sweeteners and non-nutritive sweeteners according to their nutritional value; according to their sweetness, they can be divided into low-sweetness sweeteners and high-sweetness sweeteners; Divided into natural sweeteners and synthetic sweeteners. The main functions of sweetening agent in food are as follows: (1) Taste: Sweetness is one of the indicators of many foods. In order to make food and beverages taste palatable, a certain amount of sweetener needs to be added. (2) For the adjustment and enhancement of flavor, sweetness is generally required in cakes; in beverages, there is a "sugar-acid ratio" for flavor adjustment. Sweeteners allow products to achieve good flavor while retaining fresh flavor. (3) The formation of flavor, sweetness and the flavor of many foods are complementary to each other, and the flavor of many products is produced by the combination of flavor substances and sweeteners, so many foods are added with sweeteners. Cosmetics are compound mixtures made of various raw materials through reasonable deployment and processing. Cosmetics have a wide variety of raw materials with different properties. According to the raw material properties and uses of cosmetics, it can be roughly divided into two categories: matrix raw materials and auxiliary raw materials. The former is a kind of main raw material of cosmetics, which occupies a large proportion in cosmetic formulations and plays a major functional role in cosmetics. The latter is responsible for shaping, stabilizing or imparting color, fragrance and other properties to cosmetics, which are not used in cosmetic formulations, but are extremely important. Cosmetics are chemical mixtures made of natural, synthetic or extracted substances with different functions as raw materials and processed through production procedures such as heating, stirring and emulsification. API refers to active pharmaceutical ingredent, includes human growth hormone powder, pure minoxidil powder, paracetamol powder and acetylsalicylic acid powder. It indicate that the raw materials used for the production of various preparations, the active ingredients in the preparations, and various powders, crystals, extracts, etc., prepared by chemical synthesis, plant extraction or biotechnology for medicinal purposes. Substances that the patient cannot take directly. Natural active ingredient refers to active ingredients extracted from natural products, such as oyster meat powder, bulk krill oil, tomato lycopene extract powder, etc. Chemical products are the species formed from chemical reactions. During a chemical reaction reactants are transformed into products after passing through a high energy transition state. This process results in the consumption of the reactants. It can be a spontaneous reaction or mediated by catalysts which lower the energy of the transition state, and by solvents which provide the chemical environment necessary for the reaction to take place. When represented in chemical equations products are by convention drawn on the right-hand side, even in the case of reversible reactions. The properties of products such as their energies help determine several characteristics of a chemical reaction such as whether the reaction is exergonic or endergonic. Additionally the properties of a product can make it easier to extract and purify following a chemical reaction, especially if the product has a different state of matter than the reactants. Reactants are molecular materials used to create chemical reactions. The atoms aren't created or destroyed. The materials are reactive and reactants are rearranging during a chemical reaction. Here is an example of reactants: CH4 + O2. A non-example is CO2 + H2O or "energy". Food additives are substances added to food to preserve flavor or enhance taste, appearance, or other sensory qualities. Some additives have been used for centuries as part of an effort to preserve food, for example vinegar (pickling), salt (salting), smoke (smoking), sugar (crystallization), etc. This allows for longer-lasting foods such as bacon, sweets or wines. With the advent of processed foods in the second half of the twentieth century, many additives have been introduced, of both natural and artificial origin. Food additives also include substances that may be introduced to food indirectly (called "indirect additives") in the manufacturing process, through packaging, or during storage or transport.
Дата Публикации: 16-03-22
A basin used for washing
Описание: A basin used for washing A basin used for washing, (now) particularly a permanently installed sink, fitted with a water supply and a drain, for washing the hands and face. It can be made of various materials, such as ceramic wash basins that are very common choice among many households in Singapore. Although in recent years, market have been flooded with many different types of bathroom sinks and vanities creating confusion for homeowners on choosing the right products. However, ceramic wash basin are still the most popular choice among most families. Simply because of its core advantages that is irreplaceable. Ceramic have been tested through time and can last really long so there is absoultely no doubt about its durability even after many years of excessive use. It’s resistance to stain makes cleaning easy which is one of the main reasons people choose to use ceramic basins. On top of that, it's eco friendly yet cost effective since not much maintenance is required. The vanity washbasin enriches the washing area with lots of storage space. Together with the matching furniture, the vanity washbasin gives you an especially elegant and uniform look. The cabinet module and the shelving space ensure plenty of space for daily bathroom utensils. They offer lots of practical and easy to clean shelving space, perfect for a family bathroom as a double washbasin. The matt color counter top wash basin is resistant to cracks, scratches, fading, heat and wear. The simple design with mat color make luxury bathroom .It is popular in Europe. All the glossy white design can have matt white or matt black color. As well as wall mounted wash basin, glossy white counter top wash basin and mable pattern wash basin. A toilet is a piece of sanitary hardware that collects human urine and feces, and sometimes toilet paper, usually for disposal. Flush toilets use water, while dry or non-flush toilets do not. They can be designed for a sitting position popular in Europe and North America with a toilet seat, with additional considerations for those with disabilities, or for a squatting posture more popular in Asia (see squat toilet). In urban areas, flush toilets are usually connected to a sewer system that leads to septic tanks in isolated areas. The waste is known as blackwater and the combined effluent including other sources is sewage. Dry toilets are connected to a pit, removable container, composting chamber, or other storage and treatment device, including urine diversion with a urine-diverting toilet. The technology used for modern toilets varies. Toilets are commonly made of ceramic (porcelain), concrete, plastic, or wood. Newer toilet technologies include dual flushing, low flushing, toilet seat warming, self-cleaning, female urinals and waterless urinals. Japan is known for its toilet technology. Airplane toilets are specially designed to operate in the air. The need to maintain anal hygiene post-defecation is universally recognized and toilet paper (often held by a toilet roll holder), which may also be used to wipe the vulva after urination, is widely used (as well as bidets). The wall hung toilet uses an edgeless toilet design, which can effectively prevent dirt from accumulating in the toilet. Since the toilet has no rims, there are no hidden cavities This makes the inner surface much easier to clean compared to a conventional toilet. And compared to conventional PP (Polypropylene) seat covers, UF (Urea-Formaldehyde) seat covers are high quality and scratch-resistant. UF seat covers are easy to clean and do not lose their shine even after years of use. At the same time, due to the different surface materials, this toilet can be divided into matt color wall hung toilet and glossy white wall hung toilet. A dual flush toilet is a variation of the flush toilet that uses two buttons or a handle mechanism to flush different amounts of water. A lesser amount of water is designed to flush liquid waste and the larger quantity of water is designed to flush solid waste. The system was developed by Japanese sanitary product manufacturer TOTO in 1960. It was equipped with two levers and built-in hand-washer, and was also revolutionary in that it reused the water in the hand-washer for flushing. However, it was not well known outside, or even within, Japan. In 1976, American industrial designer Victor Papanek proposed the dual flush system in his book Design for the real world, but the first practical implementation was designed in 1980, by staff at the Australian sanitary-ware company Caroma, with flush volumes of 11 and 5.5 litres. The design caught on, and a redesign in 1994 cut water usage to 6 and 3 litres. The dual-flush toilet has become almost universally adopted in Australia, New Zealand, Singapore, and Israel, with its use in new buildings often mandated by legislation in those countries. The more complex dual-flush mechanism is more expensive than many other types of low-flush toilets. A typical flush toilet is a ceramic bowl (pan) connected on the "up" side to a cistern (tank) that enables rapid filling with water, and on the "down" side to a drain pipe that removes the effluent. When a toilet is flushed, the sewage should flow into a septic tank or into a system connected to a sewage treatment plant. Toilets are an integral part of any bathroom. Whether you’re in the midst of a remodel or your old toilet is leaking and needs replacing, you'll be faced with several options when choosing a new bathroom fixture. Toilets come in many shapes, sizes, and styles, including one-piece and two-piece toilets. Traditionally, toilets were made with a tank and bowl bolted together, and some are still sold this way. However, recently one-piece toilets have become an option. A two piece toilet has a separate tank and bowl, while a one piece is all connected. But there are other differences, too. One piece toilets are typically heavier and easier to clean, and there’s less space for bacteria to grow. Because two piece toilets feature a detachable tank, they're more customizable for preferred styles and heights. Both styles can include bells and whistles like bidet attachments or low-flow energy saving. Also, either can be shaped in the standard styles: elongated, which is slightly longer, and round. Because one piece toilets are heavier, they can be more expensive to ship if you order one online. Both toilets work well.
Дата Публикации: 16-03-22
which are most common
Описание: which are most common A headband is a clothing accessory worn in the hair or around the forehead, usually to hold hair away from the face or eyes. Headbands generally consist of a loop of elastic material or a horseshoe-shaped piece of flexible plastic or metal. They come in assorted shapes and sizes and are used for both fashion and practical or utilitarian purposes. In the UK, horseshoe-shaped headbands are sometimes called "Alice bands" after the headbands that Alice is often depicted wearing in through the Looking-Glass. There are many materials used for headbands such as wood, leather, plastic, metal, fabric, hemp, teeth, human and animal hair, bone, and novelty materials. The leather headbands are usually glued onto a harder plastic headband, or they are hand-stitched. Plastic headbands, which are most common, can be wavy, straight or angled and come in many colours. Metal can be used to form and support leather headbands. Metal-only headbands may be plain or decorated, sometimes with precious jewels. Fabric headbands are comfortable because they do not dig into the head. They usually have an elastic band, so that the headband forms to the head. Toothed headbands have comb-like teeth that are connected to the top part of the headband. Their teeth ensure that the hair stays in place. Makeup headband could keep the hair looking fresh while brushing the teeth, washing the face, applying makeup or even in a quick shower. They are ideal for taming those flyaways whilst doing your makeup, stopping a face mask going in your hair, and just generally keeping your hair out of your way during your everyday make-up and skincare routines. Headbands, or sport headbands, are worn around the forehead during physical activity to absorb sweat and keep it from reaching the eyes. Sweatbands are often made of a continuous loop of terrycloth, as it is a particularly absorbent fabric. Folded bandanas, usually knotted behind the head, also serve this purpose. Headbands are usually used for sports but have not been popular since the late 1970s or early 1980s. LeBron James is one of the most notable players who wears a headband during basketball games. They also come in the form of wristbands. Hair claws, as the term suggests, are hair clips that are shaped like claws. Basically, two claws are joint together by means of a spring, which helps to open and close the claw clip while also holding the hair firmly. Due to their shapes, hair claw clips enjoy a considerable reputation when it comes to following trendy fashion and hairdos. Hair claw clips are also known as hair jaws. Hair claws are ideal for on-the-go and easy hairstyles. This hair accessory is pretty classy yet straightforward. It offers you an excellent alternative to don a formal updo or casually holding the hair at one place for carrying out home chores. Their versatility is the reason why women drool over them. Owing to their widespread popularity, millions of hair claw clips are embellishing the hairstyles of women across the globe. Although it seems pretty simple to put on a hair claw since all you need to do is pressing the rear end of the claw clip to open its jaws and attach them to the hair. The material of hair claws can be divided into many kinds, such as plastic hair claws, metal hair claws, etc. The face mask is a kind of hygiene product, which is generally worn on the mouth and nose to filter the air entering the mouth and nose to block harmful gases, odors, droplets, viruses and other substances. It is made of gauze or paper and other materials. Masks have a certain filtering effect on the air entering the lungs. Wearing masks has a very good effect when working in a polluted environment such as dust when respiratory infectious diseases are prevalent. Masks can be divided into air filter masks and air supply masks. It can also be divided into disposal facemasks, cotton facemasks and silk facemasks according to the material. But compared with the latter two, disposal facemasks are more hygienic and safer in the current situation of COVID-19. A scarf, plural scarves, is a piece of fabric worn around the neck or head for warmth, sun protection, cleanliness, fashion, religious reasons, or used to show the support for a sports club or team. They can be made in a variety of different materials such as wool, linen, silk or cotton. It is a common type of neckwear. Scarves have been worn since ancient times. The Statue of Ashurnasirpal II from the 9th century BC features the emperor wearing a shawl. In Ancient Rome, the garment was used to keep clean rather than warm. It was called a focale or sudarium (sudarium from the Latin for "sweat cloth"), and was used to wipe the sweat from the neck and face in hot weather. They were originally worn by men around their neck or tied to their belt. In later times, scarves were also worn by soldiers of all ranks in Croatia around the 17th century. The only difference in the soldiers' scarves that designated a difference in rank was that the officers had silk scarves whilst the other ranks were issued with cotton scarves. Some of the Croatian soldiers served as mercenaries with the French forces. The men's scarves were sometimes referred to as "cravats" (from the French cravate, meaning "Croat"), and were the precursor of the necktie. The scarf became a real fashion accessory by the early 19th century for both men and women. By the middle of the 20th century, scarves became one of the most essential and versatile clothing accessories for both men and women. Scarves can be divided into hijab scarf, fashion scarf, soccer scarf, silk scarf and so on. A hat&cap is a head covering which is worn for various reasons, including protection against weather conditions, ceremonial reasons such as university graduation, religious reasons, safety, or as a fashion accessory. In the past, hats were an indicator of social status. In the military, hats may denote nationality, branch of service, rank or regiment. Police typically wear distinctive hats such as peaked caps or brimmed hats, such as those worn by the Royal Canadian Mounted Police. Some hats have a protective function. As examples, the hard hat protects construction workers' heads from injury by falling objects, a British police Custodian helmet protects the officer's head, a sun hat shades the face and shoulders from the sun, a cowboy hat protects against sun and rain and an ushanka fur hat with fold-down earflaps keeps the head and ears warm. Some hats are worn for ceremonial purposes, such as the mortarboard, which is worn (or carried) during university graduation ceremonies. Some hats are worn by members of a certain profession, such as the Toque worn by chefs. Some hats have religious functions, such as the mitres worn by Bishops and the turban worn by Sikhs. Also, it can be divided into bonnets, beanie, sports caps, etc.
Дата Публикации: 16-03-22
Arylboronic acids are important
Описание: Arylboronic acids are important Arylboronic acids are important reagents for the construction of carbon-carbon bonds and carbon-heteroatom bonds. Especially, arylboronic acid esters have the advantages of high stability, low toxicity, and easy operation, and are widely used in the synthesis of drugs and active natural products. .In addition, in biology, material science and medical research, arylboronic acids have been widely used in carbohydrate sensors, enzyme inhibitors and nucleoside and carbohydrate transport carriers. Therefore, the development of efficient and mild aromatic The synthesis method of boronic acid has always been the focus of chemists. The cross‐coupling of arylboronic acids and derivatives with DAST‐type reagents under mild and metal‐free conditions to directly afford sulfinamides in moderate to good yields. Moreover, sulfonamides were obtained after a simple oxidation reaction. The reaction mechanism was investigated by 18O‐labeling experiments, and the synthetic utility was demonstrated by the sulfoxidation of natural products. Bis(pinacolato)diboron is widely used in the catalytic monoboration and diboration of carbon–carbon multiple bonds. Although known for over 90 years, only in the past two decades has the chemistry of diboron compounds been extensively explored. Many interesting structural features and reaction patterns have emerged, and more importantly, these compounds now feature prominently in both metal-catalyzed and metal-free methodologies for the formation of B–C bonds and other processes. Organoboric acid is a class of organoboron compounds with the general formula R-B(OH)2, also known as hydrocarbyl boronic acid. It is a product in which one hydroxyl group of boronic acid (B(OH)3) is replaced by an organic group. Organoboronic acid is more stable than its inorganic acid parent (HB(OH)2), but it can still be hydrolyzed under acidic conditions to generate boronic acid. Organoboronic acid has important applications in organic synthesis, such as Suzuki coupling reaction. Due to their versatility as synthetic intermediates in the preparation of complex molecules, boronic acids and derivatives play important roles in organic synthesis and medicinal chemistry. Potassium trifluoroborates are a special class of organoboron reagents that offer several advantages over the corresponding boronic acids and esters in that they are moisture- and air-stable, and are remarkably compliant with strong oxidative conditions. Sodium tetrafluoroborate is an inorganic compound with formula NaBF4. It is a salt that forms colorless or white water-soluble rhombic crystals and is soluble in water (108 g/100 mL) but less soluble in organic solvents. Sodium tetrafluoroborate is used in some fluxes used for brazing and to produce boron trifluoride. Potassium Trifluoroborate and Tetrafluoroborate Salts are both a class of compounds with the anion BF4?. Chiral compounds refer to the same molecular weight and molecular structure, but the left and right arrangements are opposite, such as the real object and its enantiomer in the mirror. Human's left and right hands have the same structure, and the order from the big to the little finger is also the same, but the order is different. The left hand is from left to right, and the right hand is from the opposite, so it is called "chirality". That is, a pair of molecules. A chiral compound can contain no improper axis of rotation (Sn), which includes planes of symmetry and inversion center. Chiral molecules are always dissymmetric (lacking Sn) but not always asymmetric (lacking all symmetry elements except the trivial identity). Asymmetric molecules are always chiral. Alkylboronic acids such as methylboronic acid and butylboronic acid are highly active catalysts for the dehydrative amide condensation of α-hydroxycarboxylic acids. The catalytic activities of these alkylboronic acids are much higher than those of the previously reported arylboronic acids. Alkenyl and alkyl acids are substituted boronic acids with carbon-boron bonds, represented by R-B(OH)2. These Lewis acids are "green" compounds due to their inherent low toxicity and rapid environmental degradation. We provide high quality alkenyl acids for alkylboronic acid derivative formation and other chemical synthesis applications. Alkenyl boronic acids are important organic synthons that are widely used in the preparation of high value-added alkenyl compounds and multifunctional alkyl boronic acid esters. Cross-coupling or lithium-halide exchange-boration reactions of alkenyl halides and their analogs are a common method for preparing alkenyl boronic esters. However, the alkenylboronic acids derivatives and their analogs are relatively expensive and complicated to prepare, which limits the general use of this method to a certain extent. Hydroboration and carboration of alkynes are another commonly used method for the preparation of alkenyl boronic esters. However, most of the hydroboration reactions of terminal alkynes can only produce 1,2-disubstituted alkenyl boronate esters, and rarely 1,1-disubstituted alkenyl boronate esters; hydroboration of asymmetric internal alkynes or carbon The boronation reaction lacks practical value due to the lack of regioselectivity. Due to their versatility as synthetic intermediates in the preparation of complex molecules, boronic acids and boronic acid derivatives play important roles in organic synthesis and medicinal chemistry. Boric acid is also one of the basic raw materials for the production of other borides, such as heterocyclic boronic acids and derivatives, other compounds, intermediate and so on.
Дата Публикации: 16-03-22
Electrocardiogram (ECG)
Описание: Electrocardiogram (ECG) An electrocardiogram (ECG) is a simple test that can be used to check your heart's rhythm and electrical activity. Sensors attached to the skin are used to detect the electrical signals produced by your heart each time it beats. hese signals are recorded by a machine and are looked at by a doctor to see if they're unusual. An ECG may be requested by a heart specialist (cardiologist) or any doctor who thinks you might have a problem with your heart, including your GP. The test can be carried out by a specially trained healthcare professional at a hospital, a clinic or at your GP surgery. Despite having a similar name, an ECG isn't the same as an echocardiogram, which is a scan of the heart. When an ECG is used An ECG is often used alongside other tests to help diagnose and monitor conditions affecting the heart. It can be used to investigate symptoms of a possible heart problem, such as chest pain, palpitations (suddenly noticeable heartbeats), dizziness and shortness of breath. An ECG can help detect: arrhythmias – where the heart beats too slowly, too quickly, or irregularly coronary heart disease – where the heart's blood supply is blocked or interrupted by a build-up of fatty substances heart attacks – where the supply of blood to the heart is suddenly blocked cardiomyopathy – where the heart walls become thickened or enlarged A series of ECGs can also be taken over time to monitor a person already diagnosed with a heart condition or taking medication known to potentially affect the heart. How an ECG is carried out There are several different ways an ECG can be carried out. Generally, the test involves attaching a number of small, sticky sensors called electrodes to your arms, legs and chest. These are connected by wires to an ECG recording machine. You don't need to do anything special to prepare for the test. You can eat and drink as normal beforehand. Before the electrodes are attached, you'll usually need to remove your upper clothing, and your chest may need to be shaved or cleaned. Once the electrodes are in place, you may be offered a hospital gown to cover yourself. The test itself usually only lasts a few minutes, and you should be able to go home soon afterwards or return to the ward if you're already staying in hospital. Ambulatory Blood Pressure Monitoring The diagnosis, management, and estimated mortality risk in patients with hypertension have been historically based on clinic or office blood pressure readings. Current evidence indicates that 24-hour ambulatory blood pressure monitoring should be an integral part of hypertension care. The 24-hour ambulatory monitors currently available on the market are small devices connected to the arm cuff with tubing that measure blood pressure every 15 to 30 minutes. After 24 hours, the patient returns, and the data are downloaded, including any information requested by the physician in a diary. The most useful information includes the 24-hour average blood pressure, the average daytime blood pressure, the average nighttime blood pressure, and the calculated percentage drop in blood pressure at night. The most widely used criteria for 24-hour measurements are from the American Heart Association 2017 guidelines and the European Society of Hypertension 2018 guidelines. Two important scenarios described in this document are white coat hypertension, in which patients have normal blood pressures at home but high blood pressures during office visits, and masked hypertension, in which patients are normotensive in the clinic but have high blood pressures outside of the office. The Centers for Medicare and Medicaid Services has made changes in its policy to allow reimbursement for a broader use of 24-hour ambulatory blood pressure monitoring within some specific guidelines. Primary care physicians should make more use of ambulatory blood pressure monitoring, especially in patients with difficult to manage hypertension. What are the features to look for before buying an ECG machine? Electrocardiography is the process of producing a recording of the electrical activity of the heart, in the form of a graph, using electrodes placed on certain specific spots on the body. This graph is called electrocardiogram. For the purpose of producing an electrocardiogram, the standard practice now is to place 10 electrodes in the following 10 different positions on the body: 4 Limbs ( Left Arm, Right Arm, Left Leg and Right Leg) + 6 on the chest on specific locations near the heart. Potential (Voltage difference) is measured between two of the electrodes or a common virtual electrode, called as the Wilson’s central terminal. Wilson’s central terminal is the average potential measurements between three of the limb electrodes – Right arm, Left arm and Left Leg. These voltage difference measurements are called “Leads”. In all 12 ‘leads’ are required to complete the ECG graph. These 12 leads include, 3 limb leads, 3 augmented limb leads and 6 chest leads (also called precordial leads). While the three limb leads are measurements of potential / voltage difference between the limb electrodes, the augmented limb leads and chest leads (also called precordial leads) are potential difference between the limb and chest electrodes vs the virtual electrode (Wilson’s central terminal). Often people use the term ‘lead’ for electrodes also and hence cause confusion as to whether there are 10 leads or 12 leads in an ECG machine. When a patient cardiac activity needs to be monitored for a longer period of time; ECG variants with fewer number of electrodes are used to help aid mobility – such as with 3-electrodes or 5-electrodes (These may be confusingly called 3-lead / 5-lead ECGs – but the numbers 3 & 5 here refer not to the number of leads obtainable but the number of electrodes used). As against the 12-leads ECGs, the 3 & 5-electrode ECGs capture less information. The 3-elecrode ECGs -capture only the limb-leads but no anterior view, hence useful for rhythm monitoring. In a 5-electrode ECG all the 6 limb leads and one chest view is also captured. If someone says e.g. 5-channel ECG or 5-leads ECG, they essentially mean 5-electrodes ECG. So, what is a channel? Channel – The other term commonly used in reference to ECG machine is number of ‘channels’. ECG machines may come as single channel, 3-channel, 6-channel or 12-channel configurations. Each lead measurement done aPre-owned GE Mac ECG machines detailed above is then passed through an ‘amplifier’ channel and recorded. In a single-channel system, each lead is recorded and displayed one at a time. In a multi-channel system, the ECG has a microprocessor which manages this processing of signals based on the number of channels. The signals are amplified, filtered and sent to a multiplexer. The multiplexer receives all the inputs, reconstructs signals, de-multiplexes and sends the output to display screen or chart recorder. If it is a 3-channel ECG, the microprocessor groups the signals received from the 12-leads, in 4 groups of 3 and processes them. Similarly, in 6-channel it is in two groups and 12-channel device the same 12-leads are processes simultaneously. Hence, higher the number of channels, faster the ECG recording would be. Clearly, ‘channels’ is different from ‘electrodes’ or ‘leads’. Point-of-Care Ultrasound: A Practical Guide for Primary Care Ultrasound has head-to-toe applications for primary care, and the newest machines are portable and affordable enough to fit into almost any practice. Family physicians can order a wide range of imaging services for patients. But barriers such as time, money, and physical distance sometimes prevent patients from accessing those services, causing gaps in care. Incorporating point-of-care ultrasound (POCUS) into clinical practice is one way to bridge those gaps. Technological advancements have allowed more physicians to bring ultrasound services to the office visit or bedside, and to make POCUS an integral part of practice. I was an early adopter, adding ultrasound to my rural practice in 1980 after delivering a surprise set of twins in the wee hours of the morning. I have never since been surprised by twins, nor missed an ectopic pregnancy. In addition, I first used POCUS during residency in 2011, after a patient complained that it felt like her intrauterine device (IUD) had moved. Everything looked normal on the pelvic exam, but a hand-me-down ultrasound machine from the clinic's obstetrics department revealed the unmistakable flutter of a tiny heartbeat. The patient was pregnant, despite having an IUD for three years. These are just two examples of the many ways POCUS can benefit doctors and patients. There is robust evidence that POCUS improves care in critically ill patients and improves the efficiency and safety of many invasive ambulatory surgeries that are otherwise performed blindly or by anatomic landmarks. There is also preliminary but growing evidence that POCUS can improve diagnostic capabilities, expedite patient care, and inform bedside treatment and management. Most recently, POCUS has proven to be a valuable tool for confirming COVID-19 diagnoses, as well as monitoring some symptoms of the disease. The hands-on, “showing while telling” nature of POCUS advances physical diagnosis skills, fosters doctor-patient communication, and increases patient satisfaction. This article outlines some common uses for POCUS and explains how to add it to a practice. Electrocardiogram (ECG) Solutions Electrocardiogram (ECG) systems record the electrical activity of the heart over time by measuring electric potentials on the surface of living tissue. A biopotential electrode is used to pick up heart signals from specific locations on the body. The differential voltage between two electrodes, or the differential voltage between one electrode and the average voltage of multiple electrodes, can be measured and displayed as one channel on the ECG printout. The primary function of the AFE is to digitize the heart signals. This process is complicated by the need to reject interference from strong RF sources, pace signals, lead-off signals, common-mode frequency, signals from other muscles, and electrical noise. Typically, the AFE includes instrumentation amplifiers (INAs), filtering, and ADCs. There are two kinds of ECG architecture design approaches—ac coupling and dc coupling.
Дата Публикации: 16-03-22
Buying an Adjustable Dumbbell Set - What to Look for
Описание: Buying an Adjustable Dumbbell Set - What to Look for Buying an Adjustable Dumbbell Set - What to Look forDumbbells are an excellent piece of equipment to buy for a home gym of any size. As you can probably tell from our large video library of exercise videos, we are big fans of bodyweight exercises. You really don't need a gym in order to get fit, but there are a few very simple and inexpensive tools that infinitely increase the number of exercises you can do and the muscle groups that you can hit. Dumbbells are definitely one of those essential pieces of equipment. In fact, if you were only going to buy one or two things, dumbbells would be one of 2 (including an exercise mat and maybe a physioball) near necessities that I would recommend purchasing. One popular option available for this particular fundamental fitness device is the adjustable dumbbell variety. When you buy an adjustable dumbbell set you significantly reduce the amount of necessary storage. This can be especially helpful if you don't have an entire room dedicated to your home gym; these can usually be tucked away or stored in a closet without taking up too much extra space. This version also typically ends up costing you less than buying a full set of individual, fixed weights. With all the different purchasing options out there, you want to make sure that you get the highest quality adjustable kettlebells that with withstand many years of use. Here are what features to look for in terms of quality, durability, and function when you're shopping around for this product. Look for an adjustable dumbbell set that has plates that are easy to switch out Because you won't be able to just grab a weight and jump into an exercise, you want to make sure that the set that you choose is one that allows you to switch plate weights out quickly and without a lot of fuss. You don't want to cut into your workout time or let your heart rate slow and muscles get cold in between sets while you change the mass that you're lifting. Research to ensure that the plates are held on in a method that is durable and not going to wear down after six months of use. Read the reviews of the particular adjustable dumbbells that you are looking at buying Look for all of the features you would normally look for in a handweight; durability, a comfortable grip, your desired thickness of the handles, and an enduring, non offensive coating. Make sure that the size and length of the overall apparatus is going to work for the exercises that you most commonly make a part of your routine. It doesn't matter if you save money on this purchase if you don't end up actually utilizing them because they aren't user-friendly! Buy a set that encompasses the both minimums and maximums that you need for your specific workouts Make sure that the adjustable dumbbell set you buy covers both the lightest and heaviest weights that you need for your exercise program. It doesn't hurt to even think ahead a bit in terms of strength gains; it would be very disappointing to buy the weights and then quickly outgrow them. Also pay attention to the increments of the weights. Consider whether you will need half pound increments or not. Contemplate before making any purchase what you will be using them for; heavy lifting, strength gains, light toning, etc. This will help you decipher which end of the lb spectrum you need to be on in terms of the ranges of heaviness. Make sure that the set has plates that wont slide If an adjustable dumbbell doesn't have a proper securing mechanism, the plates might end up being lose on either side and this would cause a “clanking” that could end up both pinching you (rare) or being just plain annoying. Make sure that there is a securing agent that holds the weights securely in place, and then that there is also a bumper of some kind or another that goes in between the plates and the fastener to allow for very little wiggle room. Choose a set that stores away efficiently This is one of the least important factors to consider while you're shopping around but considering that the saving of space is one of the perks of this type of weight, it's worth considering. Make sure that the adjustable dumbbells come in a case that allows you to quickly and ergonomically store away your mini home gym. Why the Rowing Machine Deserves Your Attention Whether you're getting to know the lay of the land in your local gym, or you're considering a new fitness machine for your home, it's time you got to know the indoor rower, also known as the ergometer or rowing machine. While it may look intimidating at first, it's actually more beginner-friendly than you might think—and it provides one hell of a workout. All the deets, here. What Is the Rowing Machine? The ergometer is essentially mimicking the rowing of a shell (aka boat), like those you see in the Olympics, according to Evan Tyrrell, owner of F45 Training in La Jolla, CA. "The rowing machine is like the Swiss Army knife of the gym," says professional rower Michelle Sosa, a Hydrow athlete. "Its multiple purposes include low-impact workouts, high-intensity sprint intervals, low-intensity endurance development, full-body strength training, core training, heart health, and posture control." Swiss Army knife is right—the rower seemingly does it all. How Do You Use a Rowing Machine? The motion you use in a rowing exercise is not always intuitive, but it's actually pretty simple once you dial it in. Here's a handy way to remember how to row: legs, core, arms (on the way out) and arms, core, legs (on the way in). Meaning, when you start from the bottom of a stroke (in the catch position), you should extend your legs, hinge your core, then use your arms to row the handle toward your chest. Then you reverse it to go back to the beginning: Extend your arms, let your core hinge forward, then bend your legs. (You can repeat it in your head as a sort of mantra while you're rowing: Legs, core, arms, arms, core, legs.) A lot of the power actually comes from the legs, but you need to keep your core tight while you push back and eventually pull the handles with your hands/arms. Sosa notes that the biggest misconception about rowing is that it's an upper-body-only exercise. "The bulk of your rowing stroke is accomplished by the legs and core," says Sosa. (See: Rowing Machine Mistakes You're Probably Making) "Rowing is about 60-percent legs, 30-percent core, and 10-percent arms," says Joseph Illustrisimo, creator of Let's Dryft in San Francisco (a workout that's half on the rower, half strength training—think Barry's with rowers instead of treadmills). "Most of rowing will be working out your hamstrings and booty, but only if you are hinging properly. It should feel like a deadlift. There's also a large amount of core activation. Your core should be engaged the whole time, so you should learn how to dynamically engage those abs and you should feel a burn throughout." You can ask a trainer at your gym to show you, or opt for an at-home program with instructional videos. Hyrdow is like the Peloton of rowing machines, so if you're in the market for a home gym addition, this would be a useful way to get some live instruction on how to use a rower. "The instruction piece is critical for beginners to ensure you're maximizing your efforts and doing it safely and correctly," says Sosa. If you want to try a class that incorporates rowing, you ca try CityRow in New York City, Let's Dryft in San Francisco, F45 Training in multiple locations, and Orangetheory Fitness (in certain locations). These all offer workouts that incorporate the rowing machine into their classes. This would give you more IRL intel on how to properly use the rowing machine and how to vary your workouts to keep things interesting. Rowing Machine Benefits Let's break down what you actually get out of using the rowing machine. What are some of the benefits of using a rower, and why would you want to hop on one at your gym? Burn a lot of calories. Because the rower offers a combo of strength and cardio training, Tyrrell says it's a "super-efficient way to burn calories." Depending on your body weight and how vigorously you're rowing, you could burn between 400 and 500 calories an hour on the rowing machine. Improve your aerobic fitness. Tyrrell noted that rowing for even just 15 minutes is "a serious aerobic workout." Rowing regularly can help increase your stamina and endurance while improving your overall cardiovascular health. Get a full-body workout. You'll truly get a full-body workout with a rowing machine. Get this—this machine uses 86 percent (!!) of the muscles in your body. (Just smile a lot during your workout and you might use 100?) Improve lower-body conditioning. Because you use your leg muscles so much in this workout (contrary to how it might seem, they're doing a majoring of the work in rowing), he noted that targeted lower-body conditioning—building strength and endurance—is among the top benefits. Strong stems, here you come. Work out with less injury risk. You have a lower injury risk on a rower machine because it's low-impact, says Tyrrell. Plus, because it's of this, you can work at a high intensity without as much wear-and-tear on your joints. "Higher-intensity exercises like plyometrics and sprinting can sometimes be hard on the body, but low-impact tools like rowing machines and bicycles are great for the body," says Illustrisimo. "You also have many variables to change in your workouts like resistance, pace, and distance." Build better posture. "Since the rowing machine primarily uses your legs, core, and back, it has loads of postural benefits, and is a great tool to engage the posterior chain of the body," says Illustrisimo. Working your posterior chain is super important for balancing our muscle strength, reducing injury risk, and helping correct the bad posture that's common in our sedentary society. Keep your workout beginner-friendly. One of the additional benefits is that it's easy for beginners to try, says Sosa. "You see and feel results quickly, which is great for beginners," says Sosa. But you have to stick with it for more than just a few minutes to make this happen. "Gym goers tend to hop on and off a rower within five minutes due to boredom or confusion, foregoing those results," she explains. Stick it out for 10 to 20 minutes to see an improvement in your form and work long enough to get your heart pumping. Folding BenchCamarillo Wooden Garden BenchWhat we like: Beautiful acacia wood construction is strong and stylish What we don’t like: No seat cushions included Resistant to both water and UV radiation, this classically styled folding bench makes an ideal addition to your backyard, patio, or pool area. The frame is made from durably constructed acacia wood that lasts for years with regular care. The seat is slatted, reinforced, with a weight capacity of 705 lb. to comfortably seat two adults. The wide curved armrests complement the slightly sloping backrest. While this bench does require assembly, the process is relatively simple. The folding mechanism is simple and user-friendly when you need to fold the bench to stow or transport it. No seat cushions are included, but the slatted acacia wood seat evenly distributes your weight, so it is comfortable on its own. Brookes 12” Rectangular Folding Bench What we like: Convenient locking mechanism What we don’t like: Not weather resistant This rustic-style folding bench is suitable for various applications, from outdoor dining to adorning your home’s foyer, and complements a farmhouse aesthetic beautifully. The benchtop is crafted from solid pine and provides space for two people. Once you unfold the sturdily built legs, simply push the pins in to lock them in place. Two heavy-gauge black steel brackets support the seat for added stability. While you can use this bench outdoors, you should avoid leaving it in the rain because it’s not water-resistant. During inclement weather, fold the bench and place it inside the house or garage, or cover it with a nylon or vinyl furniture cover. When it’s time to fold the bench, simply retract the locking pins, and the legs fold under the seat, locking securely. Convenient to lock and unlock, this is a stylish and versatile folding bench. How To Buy A Treadmill Why should you warm up before treadmill shopping? There's two main reasons which spring to mind. Firstly, you want to avoid brain sprain! With a huge array of brands, models and offers on the market, treadmill shopping can be overwhelming. Warming up will help you narrow down your options and give you a clearer idea of what you are looking for. Secondly, companies play price games. If you don't know the rules, you could end up feeling cheated instead of happy with your decision. Learn how to buy a treadmill wisely with these simple tips and tricks. 1. CHOOSE YOUR WORKOUT SPACE AND TREADMILL SIZE How much room can you offer a treadmill in your home, and where are you going to put it? To save time before shopping, measure the floor space you plan to put your treadmill on. If you're considering a folding treadmill, also measure any space (L x W x H) you have to spare for storage. Treadmill dimensions are usually published, and keeping this information handy makes you a more efficient shopper. Keep in mind that the required running space, which you can work out via the treadmill belt size, can also impact the overall footprint of the treadmill. We recommend a 22″ wide belt for runners and 20″ for walkers. Although a 20″ belt is sufficient for runners, it just leaves a little less room for error. 2. IMAGINE YOUR TREADMILL WORKOUTS Do you envision relaxing walks, intense running or something in between? Answering this question will help you narrow down your treadmill selection by motor power. The heavier the exercise you anticipate, the higher powered motor you will need. We will take a look at motor power in more detail in the second section of this guide.Your answer to the above question can also help you choose the track size for your workout needs. Walkers can save money by choosing shorter treadmill tracks and runners (especially tall runners) will need more room to stretch out
Дата Публикации: 16-03-22