Xem 1-20 trên 22 kết quả Atmospheric pressure
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Growth of carbon nanowalls at atmospheric pressure for one-step gas sensor fabrication

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  • Helicopter aerodynamics is the branch of physics dealing with the forces and pressures exerted by air in motion. The atmosphere, the mass of air, which completely envelops the earth, is composed of varying and nonvarying constituents. The nonvarying constituents include oxygen (21%) and nitrogen (78%). The varying constituents include CO2, argon, hydrogen, helium, neon, krypton, and water vapor, which will vary from negligible amounts to approximately 4% by volume (100% relative humidity). Air is a fluid and is affected by changes in temperature, pressure, and humidity....

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  • More and more evidence of global climate warming, sea level rise, droughts, floods and climate extremes are recorded. In Vietnam, the manifestation of climate change (CC) is often considered as changing the level and trend of variation of main climatic elements and sea level. However, Vietnam climate influenced by the characteristics of atmospheric circulation in the Earth climate system.

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  • Ion hóa bằng phun điện ESI (Electrospray Ionization) LC-MS • Tách bằng LC Xác định bằng MS • Khó khăn: loại ảnh hưởng của dung môi và các thành phần trong pha động; không có thư viện phổ • Để ghép nối giữa LC và MS: • giao diện ion hoá hoá học ở áp suất thường (atmospheric pressure chemical ionisation)

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  • Larry Bachus and Angel Custodio met each other in the early 1990s in Puerto Rico. Larry was working on a pump and seal conversion in a pharmaceutical chemical plant and Angel was installing a computerized preventive maintenance system in the same plant. They had passed each other in the administrative offices at the plant and one day the maintenance engineer introduced them and suggested they work together. They became fast friends and have worked together on numerous projects over the years since, including this book....

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  • stress [stres] (n): sự căng thẳng; tâm trạng căng thẳng - The stresses of morden life: những sự căng thẳng của cuộc sống hiện đại stressful ['stresfl](a): gây ra căng thẳng 2. pressure ['pre∫ə(r)](n): sức ép, áp suất, áp lực - atmospheric pressure: áp suất khí quyển - under the pressure of public opinion (dưới sức ép của dư luận quần chúng)

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  • Diesel engines, also known as CI engines, possess a wide field of applications as energy converters because of their higher efficiency. However, diesel engines are a major source of NOX and particulate matter (PM) emissions. Because of its importance, five chapters in this book have been devoted to the formulation and control of these pollutants. The world is currently experiencing an oil crisis. Gaseous fuels like natural gas, pure hydrogen gas, biomass-based and coke-based syngas can be considered as alternative fuels for diesel engines.

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  • Alubaidy et al. Nanoscale Research Letters 2011, 6:375 http://www.nanoscalereslett.com/content/6/1/375 NANO EXPRESS Open Access Synthesis of magnetic nanofibers using femtosecond laser material processing in air Mohammed-Amin Alubaidy1, Krishnan Venkatakrishnan1* and Bo Tan2 Abstract In this study, we report formation of weblike fibrous nanostructure and nanoparticles of magnetic neodymiumiron-boron (NdFeB) via femtosecond laser radiation at MHz pulse repetition frequency in air at atmospheric pressure.

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  • The report describes the environmental status of the water bodies in 2004 as well as the trend in environmental quality over the period 1989–2004 in relation to changes in the pressures. In addition it de- scribes the monitoring of terrestrial natural habitats and species, in- cluding the first results of this monitoring, which was initiated in 2004.

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  • Differential Diagnosis CENTRAL CYANOSIS (Table 35-1) Decreased SaO2 results from a marked reduction in the Pa O2. This reduction may be brought about by a decline in the FIO2 without sufficient compensatory alveolar hyperventilation to maintain alveolar PO2. Cyanosis usually becomes manifest in an ascent to an altitude of 4000 m (13,000 ft).

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  • TOMMY Benton, on his first visit to Earth, found the long-anticipated wonders of twenty-first-century New York thrilling the first week, boring and unhappy the second week, and at the end of the third he was definitely ready to go home. The never-ending racket of traffic was torture to his abnormally acute ears. Increased atmospheric pressure did funny things to his chest and stomach. And quick and sure-footed on Mars, he struggled constantly against the heavy gravity that made all his movements clumsy and uncoordinated.

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  • Control of ectoparasites on poultry creates additional exposure risks. High pressures sprays or dipping are often used in large commercial operations to treat birds for obligate ectoparasites such as the northern fowl mite. Aerosol and splash represent exposure risks for the applicator in both situations. Routes of entry may be oral, dermal or inhalation. Dipping represents the most significant risk to personnel since each bird must be handled to effectively treat the outbreak. A significant amount of splash occurs as birds are immersed and withdrawn from the dipping vat.

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  • I am going to tell you, my dear child, something of the life and nature of men and animals, believing the information may be of use to you in after-life, besides being an amusement to you now. Of course, I shall have to explain to you a great many particulars which are generally considered very difficult to understand, and which are not always taught even to grown-up people. But if we work together, and between us succeed in getting them clearly into your head, it will be a great triumph to me, and you will find out that the science of learned men is more...

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  • VACUUM DISTILLATION TOWER In order to further distill the residuum from the atmospheric tower at higher temperatures, reduced pressure is required to prevent thermal cracking. The process takes place in one vacuum distillation tower. The principles of vacuum distillation resemble those of fractional distillation and, except that larger-diameter columns are used to maintain comparable vapor velocities at the reduced pressures, the equipment is also similar.

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  • Abstract: “Brown dwarfs” is the collective name for objects more massive than giant planets such as Jupiter but less massive than M dwarf stars. This review gives a brief description of the classification and chemistry of low mass dwarfs. The current spectral classification of stars includes L and T dwarfs that encompass the coolest known stars and substellar objects. The relatively low atmospheric temperatures and high total pressures in substellar dwarfs lead to molecular gas and condensate chemistry.

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  • PART 4 ENERGY, POWER, AND POLLUTION CONTROL TECHNOLOGY p H o U 3 ; I £ 5 D 2 " 0 GO 2 H o rn £ f| |* ?f!5 Ssfcp "Hlr F | | | s^l.^ | "I a 5 co 1 I TABLE 39.1 TABLE 39.2 CONVERSION FACTORS TABLE 39.9 1247 PHASE TRANSITION DATA FOR THE ELEMENTS 1247 PHASE TRANSITION DATA FOR COMPOUNDS 1249 THERMODYNAMIC PROPERTIES OF SATURATED MERCURY 1259 TABLE 39.3 FIGURE 39.2 ENTHALPY-LOG PRESSURE DIAGRAM FOR MERCURY TABLE 39.10 TABLE 3 . THERMODYNAMIC 94 PROPERTIES OF LIQUID AND SATURATED VAPOR AIR 1251 TABLE 39.

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  • The Watt steam engine was the first type of steam engine to make use of steam at a pressure just above atmospheric to drive the piston helped by a partial vacuum. Improving on the design of the 1712 Newcomen steam engine, the Watt steam engine, developed sporadically from 1763 to 1775, was a great step in the development of the steam engine. Offering a dramatic increase in fuel efficiency, James Watt's design became synonymous with steam engines, due in no small part to his business partner, Matthew Boulton.

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  • This paper describes the work performed on two programs supported in part by the U.S. Department of Energy. These programs are aimed at evaluating the potential of using slurries of chemical hydrides and organic liquids to store hydrogen. The projects have been very successful in meeting all project objectives. After a detailed analysis of chemical hydrides, lithium hydride was selected for use in these programs.

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  • Early in the morning on June 30, 1908, a giant airburst occurred over the basin of the Podkamennaya Tunguska River in Central Siberia, Russia, leveling trees over an area of 2,000 km2 (770 mi2) (Figure 1). Eyewitnesses described a ―fire ball, bright as the Sun‖ (Longo, 2007). The event produced seismic and pressure waves that were recorded all over the world and led to atmospheric phenomena (e.g. , bright nights, noctilucent clouds) observed over much of Eurasia.

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  • Fe3O4 nanoparticles have been prepared by the microemulsion technique with water as the aqueous phase, n-hexane as the oil phase and Span 80 as the surfactant. The reaction occurred under air, N2 or high temperature and high pressure atmosphere. Particle size can be controlled by the concentration of the reactants dissolved in water, the ratio of water/surfactant and the atmospheric conditions.

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