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Vaccine Cooler
Many vaccines require refrigeration to remain active, and the lack of infrastructure to maintain the cool chain to reliably bring vaccines into more remote areas of developing countries poses a serious challenge to national immunization programs. Portable vaccine cooler units have been proposed by several technologists. The WHO Performance, Quality and Safety (PQS) programme is a driver of the technology. __TOC__ Technology development In 2005 Ian Tansley of Sure Chill designed an ice-chest vaccine cooler regulated by the density of water. Since water has greatest density at around 4 °C, putting the vaccine chamber at the bottom of a thermo-syphon regulates the temperature at between 2 °C and 8 °C, as long as there is ice and the heat-exchange capacity is not overloaded. Sure Chill claimed to be WHO approved and in use for vaccine storage in 46 countries. A refrigeration device was shown for this purpose by Adam Grosser at a TED Talk TED Conferences, LLC ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vaccines
A vaccine is a biological preparation that provides active acquired immunity to a particular infectious or malignant disease. The safety and effectiveness of vaccines has been widely studied and verified. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and recognize further and destroy any of the microorganisms associated with that agent that it may encounter in the future. Vaccines can be prophylactic (to prevent or alleviate the effects of a future infection by a natural or "wild" pathogen), or therapeutic (to fight a disease that has already occurred, such as cancer). Some vaccines offer full sterilizing immunity, in which infection is prevented. The administration of vaccines is called vaccination. Vaccination is the most effective ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonia
Ammonia is an inorganic chemical compound of nitrogen and hydrogen with the chemical formula, formula . A Binary compounds of hydrogen, stable binary hydride and the simplest pnictogen hydride, ammonia is a colourless gas with a distinctive pungent smell. It is widely used in fertilizers, refrigerants, explosives, cleaning agents, and is a precursor for numeous chemicals. Biologically, it is a common nitrogenous waste, and it contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to fertilisers. Around 70% of ammonia produced industrially is used to make fertilisers in various forms and composition, such as urea and diammonium phosphate. Ammonia in pure form is also applied directly into the soil. Ammonia, either directly or indirectly, is also a building block for the synthesis of many chemicals. In many countries, it is classified as an List of extremely hazardous substances, extremely hazardous substance. Ammonia is toxic, cau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cooling Technology
Cooling is removal of heat, usually resulting in a lower temperature and/or phase change. Temperature lowering achieved by any other means may also be called cooling. The transfer of thermal energy may occur via thermal radiation, heat conduction or convection. Examples can be as simple as reducing temperature of a coffee. Devices *Coolant *Cooling towers, as used in large industrial plants and power stations *Daytime passive radiative cooler *Evaporative cooler *Heat exchanger *Heat pipe *Heat sink *HVAC (Heating, Ventilation and Air Conditioning) *Intercooler *Radiative cooling in Heat shields *Radiators in automobiles *Pumpable ice technology *Thermoelectric cooling *Vortex tube, as used in industrial spot cooling See also * Computer cooling * Refridgeration Refrigeration is any of various types of cooling of a space, substance, or system to lower and/or maintain its temperature below the ambient one (while the removed heat is ejected to a place of higher temperature) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vaccination
Vaccination is the administration of a vaccine to help the immune system develop immunity from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism. In stimulating the body's Adaptive immune system, adaptive immunity, they help prevent sickness from an infectious disease. When a sufficiently large percentage of a population has been vaccinated, herd immunity results. Herd immunity protects those who may be immunocompromised and cannot get a vaccine because even a weakened version would harm them. The effectiveness of vaccination has been widely studied and verified. Vaccination is the most effective method of preventing infectious diseases; widespread immunity due to vaccination is largely responsible for the Eradication of infectious diseases, worldwide eradication of smallpox and the elimination of diseases such as polio and tetanus from much of the world. According to the World Health Organization ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propane
Propane () is a three-carbon chain alkane with the molecular formula . It is a gas at standard temperature and pressure, but becomes liquid when compressed for transportation and storage. A by-product of natural gas processing and petroleum refining, it is often a constituent of liquefied petroleum gas (LPG), which is commonly used as a fuel in domestic and industrial applications and in low-emissions public transportation; other constituents of LPG may include propene, propylene, butane, butene, butylene, butadiene, and isobutylene. Discovered in 1857 by the French chemist Marcellin Berthelot, it became commercially available in the US by 1911. Propane has lower volumetric energy density than gasoline or coal, but has higher gravimetric energy density than them and burns more cleanly. Propane gas has become a popular choice for barbecues and portable stoves because its low −42 °C boiling point makes it vaporise inside pressurised liquid containers (it exists in two pha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electricity
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations. Common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others. The presence of either a positive or negative electric charge produces an electric field. The motion of electric charges is an electric current and produces a magnetic field. In most applications, Coulomb's law determines the force acting on an electric charge. Electric potential is the Work (physics), work done to move an electric charge from one point to another within an electric field, typically measured in volts. Electricity plays a central role in many modern technologies, serving in electric power where electric current is used to energise equipment, and in electronics dealing w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icyball
Icyball is a name given to two early refrigerators, one made by Australian Sir Edward Hallstrom in 1923, and the other design patented by David Forbes Keith of Toronto (filed 1927, granted 1929), and manufactured by American Powel Crosley Jr., who bought the rights to the device. Both devices are unusual in design in that they did not require the use of electricity for cooling. They can run for a day on a cup of kerosene, allowing rural users lacking electricity the benefits of refrigeration. Operation (Crosley Icyball) The Crosley Icyball is as an example of a gas-absorption refrigerator, as can be found today in recreational vehicles or campervans. Unlike most refrigerators, the Icyball has no moving parts, and instead of operating continuously, is manually cycled. Typically it is charged in the morning for 1.5 hours, and provides cooling throughout the heat of the day. Absorption refrigerators and the more common mechanical refrigerators both cool by the evaporation of refr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Dyson Award
The James Dyson Award is an international student design award in the fields of product design, industrial design and engineering. Description The James Dyson Award is open to university level students (or recent graduates) and rewards those who "design something that solves a problem". The award is run by the James Dyson Foundation, James Dyson’s charitable trust, as part of its mission to get young people involved in design engineering. To qualify students must have studied in: Australia, Austria, Belgium, Canada, China, France, Germany, Ireland, India, Italy, Japan, Korea, Malaysia, Netherlands, New Zealand, Russia, Singapore, Spain, Sweden, Switzerland, Taiwan, Thailand, United Kingdom or the United States. One national winner and four finalists are chosen from each country. James Dyson selects an international winner for the overall prize. Winners ;International winners *2007 Maxi Pantel (Germany) for the ''Senjo'', an electronic device for the deaf to communicate w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Will Broadway
Will may refer to: Common meanings * Will and testament, instructions for the disposition of one's property after death * Will (philosophy), or willpower * Will (sociology) * Will, volition (psychology) * Will, a modal verb - see Shall and will People and fictional characters * Will (comics) (1927–2000), a comic strip artist * Will (given name), a list of people and fictional characters named Will or Wil * Will (surname) * Will (Brazilian footballer) (born 1973) * Will (singer), Italian singer-songwriter Arts, entertainment, and media Films * '' Will: G. Gordon Liddy'', a 1982 TV film * ''Will'' (1981 film), an American drama * ''Will'' (2011 film), a British sports drama * ''Will'', a Japanese documentary film featuring Masahiro Higashide * ''Bandslam'', a 2008 film with the working title ''Will'' Literature * ''Will'' (novel), by Christopher Rush * ''Will'' (Will Self memoir), 2019 * ''Will'' (Will Smith memoir), 2021 * ''Will'', an autobiography by G. Gordon Liddy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twinbird Corporation
Twinbird Corporation, founded in 1951, is a manufacturer of household electric products with headquarters in Tsubame City, Niigata Prefecture, Japan. Shigekatsu Nomizu is the President, employing 284 people as of March 2010. It was founded as a plating company in 1951. In the 1980s it expanded into small electrical appliances and began developing products occasionally in conjunction with other companies. The free-piston Stirling cooler is one such product that was developed jointly and under license to Global Cooling. By 2002, Twinbird released the first ever consumer product utilizing the free-piston Stirling cycle process.Edwards, J. 'Cooling: Stirling Strikes', Appliance Design, April 2008 Before this, free-piston Stirling machines were only available at extremely high cost generally used for specialized aerospace applications. A branded version of a portable refrigerator using the free-piston Stirling cooler was sold for a time by the Coleman Company The Coleman Compan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Applications Of The Stirling Engine
Applications of the Stirling engine range from mechanical propulsion to heating and cooling to electrical generation systems. A Stirling engine is a heat engine operating by cyclic compression and expansion of air or other gas, the "working fluid", at different temperature levels such that there is a net conversion of heat to mechanical work. The Stirling cycle heat engine can also be driven in reverse, using a mechanical energy input to drive heat transfer in a reversed direction (i.e. a heat pump, or refrigerator). There are several design configurations for Stirling engines that can be built (many of which require rotary or sliding seals) which can introduce difficult tradeoffs between frictional losses and refrigerant leakage. A free-piston variant of the Stirling engine can be built, which can be completely hermetically sealed, reducing friction losses and completely eliminating refrigerant leakage. For example, a free-piston Stirling cooler (FPSC) can convert an electrical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Butane
Butane () is an alkane with the formula C4H10. Butane exists as two isomers, ''n''-butane with connectivity and iso-butane with the formula . Both isomers are highly flammable, colorless, easily liquefied gases that quickly vaporize at room temperature and pressure. Butanes are a trace components of natural gases (NG gases). The other hydrocarbons in NG include propane, ethane, and especially methane, which are more abundant. Liquefied petroleum gas is a mixture of propane and some butanes. The name butane comes from the root but- (from butyric acid, named after the Greek word for butter) and the suffix -ane (for organic compounds). History The first synthesis of butane was accidentally achieved by British chemist Edward Frankland in 1849 from ethyl iodide and zinc, but he had not realized that the ethyl radical dimerized and misidentified the substance. It was discovered in crude petroleum in 1864 by Edmund Ronalds, who was the first to describe its proper ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
