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化学气相沉积室钝化方法
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《电镀与涂饰》 CAS CSCD 2002年第5期65-66,共2页
关键词 化学沉积 钝化方法 湿式清洗 就地清洗 调理
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消除蒸脱机汽相室正压方法
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作者 吴道银 徐树元 《粮食与油脂》 2002年第2期42-42,共1页
本文简要分析了蒸脱机汽相室产生正压的原因并结合生产实践提出消除正压的具体措施。
关键词 蒸脱机 正压 油脂浸出 消除方法 气相室
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Advances in LES of Two-phase Combustion(Ⅱ) LES of Complex Gas-Particle Flows and Coal Combustion 被引量:1
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作者 周力行 胡瓅元 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第4期609-616,共8页
Large-eddy simulation(LES) is under its rapid development and is recognized as a possible second generation of CFD methods used in engineering.Large-eddy simulation of two-phase flows and combustion is particularly im... Large-eddy simulation(LES) is under its rapid development and is recognized as a possible second generation of CFD methods used in engineering.Large-eddy simulation of two-phase flows and combustion is particularly important for engineering applications.Some investigators,including the present authors,give their review on LES of spray combustion in gas-turbine combustors and internal combustion engines.However,up to now only a few papers are related to the state-of-the-art on LES of gas-particle flows and combustion.In this paper a review of the advances in LES of complex gas-particle flows and coal combustion is presented.Different sub-grid scale(SGS) stress models and combustion models are described,some of the main results are summarized,and some research needs are discussed. 展开更多
关键词 large-eddy simulation complex gas-particle flows coal combustion
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Technical Procedure Determination of Thoron Indoor Concentration by LR-115 Type II
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作者 Nguyen Thi Thu Ha Frinh Van Giap Le Dinh Cuong 《Journal of Environmental Science and Engineering(B)》 2016年第3期109-114,共6页
Thoron (Rn-220) is an invisible, odorless radioactive gas and nine times heavier than air. Purpose of project is to set up procedure to determine Rn-220 concentration which has been carried out in laboratory using S... Thoron (Rn-220) is an invisible, odorless radioactive gas and nine times heavier than air. Purpose of project is to set up procedure to determine Rn-220 concentration which has been carried out in laboratory using Solid State Nuclear Track Detector (SSNTD) based passive detector technique. In this study, technical procedure has been applied in Karlsruhe diffusion chamber and LR-115, Type II strippable (Kodak Pathe, France) detector. The results have investigated how LR-115 work for Rn-220 by using Monazite ore to simultaneously measure Rn-222 and Rn-220. To carry out experiment, Karlsruhe diffusion chamber is used to with and without Poly-Ethylene (PE) membrane. Karlsruhe diffusion chamber with PE membrane only detect Rn-222, without PE membrane detect total Rn-222 and Rn-220. Precision evaluation by duplicate measure at 8 cm detector-source distance with relative standard deviation is less than 2.54%. Testing technical procedure, detectors have been sent to National Institute of Radiological Science (NIRS) for Rn-220 calibration exposure. After detectors have been calibration exposure at NIRS, it carried out all the following steps of procedure which set up at laboratory in 1NST, Vietnam. Finally, calibration factor calculated is 0.21 (tracks-cm2/Bq·m3·h) and constructed curve between integrated Tn-220 concentration and tracks density with factor R2 = 0.975. 展开更多
关键词 LR-115 type-II (SSNTDs) Rn-220 spark counter.
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Potential Energy Surface of Cytosine and Tunneling Between Its Normal and Trans-imino Tautomer
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作者 ZHAO Zhen-Min ZHANG Qi-Ren GAO Chun-Yuan 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第3X期541-544,共4页
The potential energy surface of H(13) proton in base cytosine of the DNA molecules is calculated at the Caussian 98 MP2/6-311C(d,p) level. Two potential wells are found. One corresponds to the normal cytosine, whi... The potential energy surface of H(13) proton in base cytosine of the DNA molecules is calculated at the Caussian 98 MP2/6-311C(d,p) level. Two potential wells are found. One corresponds to the normal cytosine, while the other corresponds to its trans-imino tautomer. The estimated tunneling probability of the H(13) proton from one well to another well shows that the life time of the proton staying in one of these wells is about 600 yrs. It is too long to let tautomers of cytosine be in thermodynamical equilibrium in a room temperature gas phase experiment. 展开更多
关键词 potential energy surface cytosine trans-imino tautomer
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Phytochemical Screening of Essential Oil of Citrus sinensis by Gas Chromatography-Flame Ionization Detector
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作者 Kammegne Djidjou Patricia Bella Oden Gervais Martial Dongo Kenfack Kelack Justine Yvonne 《Journal of Agricultural Science and Technology(B)》 2015年第3期193-196,共4页
Citrus sinensis commonly called sweet orange belongs to the family Rutaceae. Nutritionally, it is highly recommended due to its high content of micronutrients. However, the rejection of a large amount of epicarp in na... Citrus sinensis commonly called sweet orange belongs to the family Rutaceae. Nutritionally, it is highly recommended due to its high content of micronutrients. However, the rejection of a large amount of epicarp in nature contributes to the emission of greenhouse gas and the development of leachate which contaminate surface water and groundwater. The aim of this work was to identify the essential oil components from Citrus sinensis epicarp, and then look after the biological activity of these components in order to underline the worth to reuse the Citrus sinensis epicarp as a gainful mean. The essential oil of 4,000 g of Citrus sinensis epicarp was done through the water steam distillation and 0.0287 g of essential oil was obtained; so a yield of 0.0007%. The essential oil was then submitted to gas chromatography-flame ionization detector (GC-F1D). The result revealed that the essential oil was teemed with 28 volatile compounds, including terpene compounds (50%), aldehydes (32%) and alcohols (18%) whose anti-inflammatory, anti-diabetic, larvicidal and antioxidant activities were underlined. 展开更多
关键词 ENVIRONMENT Citrus sinensis essential oil.
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The green fuel from carbon waste: optimization and product selectivity model studies
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作者 Hossein Atashi Fatemeh Rezaeian Ali Akbar Mirzaei 《International Journal of Coal Science & Technology》 EI 2018年第3期399-410,共12页
Increase in greenhouse gases, has made scientists to substitute alternative fuels for fossil fuels. Nowadays, converting biomass into liquid by Fischer-Tropsch synthesis is a major concern for alternative fuels (gaso... Increase in greenhouse gases, has made scientists to substitute alternative fuels for fossil fuels. Nowadays, converting biomass into liquid by Fischer-Tropsch synthesis is a major concern for alternative fuels (gasoline, diesel etc.). Selectivity of Fischer-Tropsch hydrocarbon product (green fuel) is an important issue. In this study, the experimental data has been obtained from three factors; temperature, H2/CO ratio and pressure in the fixed bed micro reactor. T = 543-618 (K), P = 3-10 (bar), H2/CO = 1-2 and space velocity = 4500 (l/h) were the reactor conditions. The results of product modeling for methane (CH4), ethane (C2H6), ethylene (C2H4) and CO conversion with experimental data were compared. The effective parameters and the interaction between them were investigated in the model. H2/CO ratio and pressure and interaction between pressure and H2/CO in ethane selectivity model and CO conversion and interaction between temperature and H2/CO ratio in methane selectivity model and ethylene gave the best results. To determine the optimal conditions for light hydrocarbons, ANOVA and RSM were employed. Finally, products optimization was done and results were concluded. 展开更多
关键词 Selectivity model Fischer-Tropsch synthesis Green fuel OPTIMIZATION Fixed bed micro reactor Alternative fuels
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Respiratory Risk Associated with Indoor Air Pollutants in the Form of Settled House Dust
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作者 Herbert Jackson III 《Journal of Environmental Science and Engineering(B)》 2017年第5期231-293,共63页
Asthma and allergies are considered by many physicians as being triggered by different substances in the air that people breathe. The lung is the most common site of injury by airborne pollutants. Acute effects, howev... Asthma and allergies are considered by many physicians as being triggered by different substances in the air that people breathe. The lung is the most common site of injury by airborne pollutants. Acute effects, however, may also include non-respiratory signs and symptoms, which may depend upon toxicological characteristics of the substances and host-related factors. The studying of indoor air quality can provide a method for appropriate remedial action. Research suggests that SHD (Settled House Dust) may be a significant source for indoor exposure to different substances. This research study consisted of sampling dust from homes in different area codes. The dust samples were collected from August 2006 thru March 2007 and analyzed using GC/MS (Gas Chromatography/Mass Spectrometry). The purpose of this research study will display how sampling household dust is a powerful tool for identifying chemicals that contribute to poor indoor air quality. 展开更多
关键词 SHD (Settled House Dust) asthma and allergies phthalates.
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Mn-doped SiGe thin films grown by UHV/CVD with room-temperature ferromagnetism and high hole mobility 被引量:2
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作者 Limeng Shen Xi Zhang +3 位作者 Jiaqi Wang Jianyuan Wang Cheng Li Gang Xiang 《Science China Materials》 SCIE EI CAS CSCD 2022年第10期2826-2832,共7页
In this work,silicon-germanium(SiGe)thin films are epitaxially grown on Ge substrates by ultra-high vacuum chemical vapor deposition and then doped with Mn element by ion-implantation and subsequent rapid thermal anne... In this work,silicon-germanium(SiGe)thin films are epitaxially grown on Ge substrates by ultra-high vacuum chemical vapor deposition and then doped with Mn element by ion-implantation and subsequent rapid thermal annealing(RTA).The characterizations show that the epitaxial SiGe thin films are single-crystalline with uniform tensile strain and then become polycrystalline after the ion implantation and following RTA.The magnetization measurements indicate that the annealed thin films exhibit Mn concentration-dependent ferromagnetism up to 309 K and the X-ray magnetic circular dichroism characterizations reveal the spin and orbital magnetic moments from the substitutional Mn element.To minimize the influence of anomalous Hall effect,magneto-transport measurements at a high magnetic field up to 31 T at 300 K are performed to obtain the hole mobility,which reaches a record-high value of~1230 cm^(2)V^(-1)s^(-1),owing to the crystalline quality and tensile strain-induced energy band modulation of the samples.The first demonstration of Mn-doped SiGe thin films with roomtemperature ferromagnetism and high carrier mobility may pave the way for practical semiconductor spintronic applications. 展开更多
关键词 diluted magnetic semiconductor Mn-doped SiGe FERROMAGNETISM hole mobility UHV/CVD
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Accurate characterization of room-temperature long range magnetic order in GaN: Mn by magnetic force microscope 被引量:1
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作者 ZHANG YuHao LIN ZhiYuan +8 位作者 CHEN ZhiTao QIAN YuZhou YANG XueLin LI Ding ZHANG FaFa DAI Tao HAN BaoShan WANG CunDa ZHANG GuoYi 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第1期15-18,共4页
Room-temperature ferromagnetism with a Curie temperature higher than 380 K was studied in GaN: Mn thin films grown by metal-organic chemical vapor deposition. By etching artificial microstructures on the GaN: Mn layer... Room-temperature ferromagnetism with a Curie temperature higher than 380 K was studied in GaN: Mn thin films grown by metal-organic chemical vapor deposition. By etching artificial microstructures on the GaN: Mn layer,strong magnetic responses were observed in the magnetic force microscopy (MFM) measurement,which revealed that the films were independent of dopant particles and clusters. Numerical simulation on the data of atomic force microscope (AFM) and MFM measurements covering the whole microstructure validated the formation of long range magnetic order. This result excluded a variety of controversial origins of room-temperature ferromagnetism in the GaN: Mn and gave a strong evidence of our GaN: Mn as the intrinsic diluted magnetic semiconductor (DMS). The forwarded method for accurate characterization of long range magnetic order could be applied to a wide range of DMS and diluted magnetic oxide (DMO) systems. 展开更多
关键词 GaN: Mn diluted magnetic semiconductor atomic force microscope magnetic force microscope room-temperature longrange magnetic order
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