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Optimization and verification of free flight separation similarity law in high-speed wind tunnel 认领
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作者 Fei XUE Xin JIN +4 位作者 Peihua FENG Han QIN Zenghui JIANG Yuchao WANG Peng BAI 《中国航空学报:英文版》 SCIE EI CAS CSCD 2020年第2期501-507,共7页
Based on the similarity of separation time,a similarity law optimization method for high-speed weapon delivery test is derived.The typical separation state under wind load is simulated by the numerical method.The real... Based on the similarity of separation time,a similarity law optimization method for high-speed weapon delivery test is derived.The typical separation state under wind load is simulated by the numerical method.The real separation data of aircraft,separation data of previous test methods,separation data of ideal wind tunnel test of previous methods,and simulation data of the proposed optimization method are obtained.A comparison of the data shows that the method proposed can improve the performance of tracking.Similarity law optimization starts with the development of motion equations and dynamic equations in the windless state to address the problems of mismatching between vertical and horizontal displacement,and to address the problems of separation trajectory distortion caused by insufficient gravity acceleration of the scaling model of existing light model.The ejection velocity of the model is taken as a factor/vector,and is adjusted reasonably to compensate the linear displacement insufficiency caused by the insufficient vertical acceleration of the light model method,so as to ensure the matching of the vertical and horizontal displacement of the projectile,and to improve the consistency between the test results of high-speed projection and the actual separation trajectory.The optimized similarity law is applicable to many existing free-throwing modes of high-speed wind tunnels.The optimized similarity law is not affected by the ejection velocity and hanging mode of the projectile.The optimized similarity law is suitable not only for the launching of the buried ammunition compartment and external stores,but also for the test design of projectile launching and gravity separation. 展开更多
关键词 Carrier and MISSILE interference EJECTION SEPARATION Gravity SEPARATION High-speed WEAPON delivery Multi-body SEPARATION SIMILARITY law OPTIMIZATION
文章速递Turbulence Intensity Effects on a Leading-Edge Separation Bubble of Flat Plate Wing at Low-Reynolds Numbers 认领
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作者 Masayuki Anyoji 《流量控制、测量及可视化(英文)》 2020年第4期188-207,共20页
In this study, we experimentally investigate the effects of mainstream turbulence intensity (<em>T<sub>i</sub></em>) on a leading-edge separation bubble under low-Reynolds number (<em>Re&... In this study, we experimentally investigate the effects of mainstream turbulence intensity (<em>T<sub>i</sub></em>) on a leading-edge separation bubble under low-Reynolds number (<em>Re<sub>c</sub></em>) conditions range of 2.0 × 10<sup>4</sup> to 6.0 × 10<sup>4</sup>. We used a flat plate to fix a separation point at the leading edge. Also, we visualized the behavior of the leading-edge separation bubble using the smoke wire technique and Particle Image Velocimetry (PIV) measurement. Furthermore, we measured the effect of <em style="white-space:normal;">T<sub>i</sub></em> on the turbulent transition process in the separated shear layer using a hot-wire anemometer. The results indicate that the bypass transition for large <em style="white-space:normal;">T<sub>i</sub></em> causes the turbulent transition, and so accelerates the reattachment of the separated shear layer. The results show that the bypass transition promotes the reattachment of the separated shear layer to maintain the leading-edge separation bubble on the upper surface even at high angles of attack, increasing the stall angle. 展开更多
关键词 Separation Turbulence Transition Fluid Dynamics
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Developing a Novel Approach for Sludge Treatment Using Microwaves Technology 认领
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作者 David Yu Wendy Li 《地球科学和环境保护期刊(英文)》 2020年第5期195-203,共9页
The purpose of this research is to find a method that can improve the cost and efficiency of sludge treatment. Currently, large amounts of sludge are produced every day, but sludge treatment is neither efficient nor p... The purpose of this research is to find a method that can improve the cost and efficiency of sludge treatment. Currently, large amounts of sludge are produced every day, but sludge treatment is neither efficient nor profitable. To improve the sludge treatment process, we proposed the method of using microwave technology to treat sludge. We hypothesized that using microwave technology, we can reduce the volume of the sludge up to 90%, and can save more energy and time comparing to the traditional methods that we are currently using to treat the sludge. To prove our hypothesis, we designed an experiment to compare the solid-liquid boundary height and the solid-liquid mass ratio of the sludge treated by the conventional method and the microwave technology. Prime temperature and time found for dewatering sludge are 70 Celsius degrees and five minutes. The results were rather surprising, as microwave heating demonstrated no significant advantage over conventional heating. The solid-liquid boundary height of sludge heated by conventional and by microwave methods are 22.34 mL and 22.56 mL;the solid-liquid mass ratio of sludge using conventional heating and microwave heating at 70 Celsius degrees are 14.28% and 14.55% (by separation with filter press), or 9.82% and 9.89% (by centrifugation). In conclusion, the difference is negligible. 展开更多
关键词 MUNICIPAL SEWER SLUDGE SLUDGE DEWATERING Microwave Treatment INTRACELLULAR Water Thermal CONDITIONING Solid Liquid Separation
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Separation of Molybdenum Isotopes at Supercritical Fluid Extraction with Carbon Dioxide in a Vertical Gradient Field of Temperatures 认领
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作者 Boris Viktorovich Borts Stella Fedorovna Skoromnaya Viktor Ivanovich Tkachenко 《金属学报(美国)》 2020年第1期1-15,共15页
Separation of molybdenum isotope complexes by supercritical fluid extraction (SFE) with carbon dioxide was studied experimentally. The extraction of molybdenum isotope complexes was carried out in the updated extracti... Separation of molybdenum isotope complexes by supercritical fluid extraction (SFE) with carbon dioxide was studied experimentally. The extraction of molybdenum isotope complexes was carried out in the updated extraction chamber (reactor) of the SFE-U installation, which provided an initial pressure of P ≤ 20 MPa at constant temperatures of the upper T1 = 35&deg;C and bottom T2 = 45&deg;C flanges. The device, through which the eluent was discharged, involved a set of four thin tubes of different lengths located inside the reactor. The axes of the tubes and the reactor are parallel and the tubes are equally spaced circumferentially inside the reactor. The extract was removed from each tube through channels isolated from each other and located in the bottom flange with cylindrical expansion, in which several layers of filter paper were placed. After passing through the filters the extract entered a restrictor designed to remove the eluent from the reactor. The initial pressure of carbon dioxide and the holding time of the extract were specified in the experiments. The level of the eluent sampling was set by the lengths of the tubes depending on the reactor height. A method of producing molybdenum complexes was described. It was experimentally shown that at an initial pressure of 20 MPa and a given holding time a difference from the natural content of Mo isotopes for given heights of extract sampling depending on the reactor height was observed in extracts removed through filters. The ranges of deviation of the content of molybdenum isotopes in extracts from natural one were determined. 展开更多
关键词 Carbon Dioxide SUPERCRITICAL Fluids Extraction MOLYBDENUM ISOTOPES SEPARATION
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Kolmogorov’s Probability Spaces for “Entangled” Data-Subsets of EPRB Experiments: No Violation of Einstein’s Separation Principle 认领
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作者 Karl Hess? 《现代物理(英文)》 2020年第5期683-702,共20页
It is demonstrated that the use of Kolmogorov’s probability theory to describe results of quantum probability for EPRB (Einstein-Podolsky-Rosen-Bohm) experiments requires extreme care when different subsets of measur... It is demonstrated that the use of Kolmogorov’s probability theory to describe results of quantum probability for EPRB (Einstein-Podolsky-Rosen-Bohm) experiments requires extreme care when different subsets of measurement outcomes are considered. J. S. Bell and his followers have committed critical inaccuracies related to spin-gauge and probability measures of such subsets, because they use exclusively a single probability space for all data sets and sub-sets of data. It is also shown that Bell and followers use far too stringent epistemological requirements for the consequences of space-like separation. Their requirements reach way beyond Einstein’s separation principle and cannot be met by the major existing physical theories including relativity and even classical mechanics. For example, the independent free will does not empower the experimenters to choose multiple independent spin-gauges in the two EPRB wings. It is demonstrated that the suggestion of instantaneous influences at a distance (supposedly “derived” from experiments with entangled quantum entities) is a consequence of said inaccuracies and takes back rank as soon as the Kolmogorov probability measures are related to a consistent global spin-gauge and permitted to be different for different data subsets: Using statistical interpretations and different probability spaces for certain subsets of outcomes instead of probability amplitudes related to single quantum entities, permits physical explanations without a violation of Einstein’s separation principle. 展开更多
关键词 Bell’s THEOREM Einstein’s Separation PRINCIPLE EPRB EXPERIMENTS
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司法体制改革背景下“分调裁”机制改革的实践与完善 认领
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作者 岳彩领 王涵 《南海法学》 2020年第1期57-65,共9页
深化“分调裁”机制改革,实现多元解纷、简案快审、繁案精审,构建分层递进、衔接配套纠纷解决体系,是当前司法改革的应有之义,更是满足人民群众多元司法需求、消解人案矛盾、积极提升国家治理能力的现实需求。但当前司法实践中,矛盾纠... 深化“分调裁”机制改革,实现多元解纷、简案快审、繁案精审,构建分层递进、衔接配套纠纷解决体系,是当前司法改革的应有之义,更是满足人民群众多元司法需求、消解人案矛盾、积极提升国家治理能力的现实需求。但当前司法实践中,矛盾纠纷吸附能力有待扩大、调解力量有待加强、速裁团队内部职责有待优化、衔接机制有待进一步调整、信息化建设总体水平不高等因素制约着“分调裁”机制作用发挥,建议从加强科学有效引导、速裁团队建设、拓展调解力量、智慧法院建设、完善配套机制等方面予以完善。 展开更多
关键词 分调裁 繁简分流 调解 速裁
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Simple fabrication of superhydrophobic PLA with honeycomb-like structures for high-efficiency oil-water separation 认领
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作者 Xiaolong Wang Yamin Pan +6 位作者 Huan Yuan Meng Su Chunguang Shao Chuntai Liu Zhanhu Guo Changyu Shen Xianhu Liu 《中国化学快报:英文版》 SCIE CAS CSCD 2020年第2期365-368,共4页
Polylactic acid(PLA) is one of the most suitable candidates for environmental pollution treatment because of its biodegradability which will not cause secondary pollution to the environment after application.However,t... Polylactic acid(PLA) is one of the most suitable candidates for environmental pollution treatment because of its biodegradability which will not cause secondary pollution to the environment after application.However,there is still a lack of a green and facile way to prepare PLA oil-water separation materials.In this work,a water-assisted thermally induced phase separation method for the preparation of superhydrophobic PLA oil-water separation material with honeycomb-like structures is reported.The PLA material shows great ability in application and could adsorb 27.3 times oil to its own weight.In addition,it could also be applicated as a filter with excellent efficiency(50.9 m^3 m^(-2) h^(-1)). 展开更多
关键词 BIODEGRADABILITY PLA Phase SEPARATION Oil-water SEPARATION SUPERHYDROPHOBICITY
Competition between Liquid-liquid De-mixing, Crystallization, and Glass Transition in Solutions of PLA of Different Stereochemistry and DEET 认领
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作者 Chanita Sungkapreecha Walter WFocke René Androsch 《高分子科学:英文版》 SCIE CAS CSCD 2020年第2期174-178,I0007共6页
Liquid-liquid(L-L)de-mixing and vitrification of solutions of either crystallizable poly(L-lactic acid)(PLLA)or non-crystallizable poly(D/L-lactic acid)(PDLLA)with 50 m%N,N-diethyl-3-methylbenzamide(DEET)were analyzed... Liquid-liquid(L-L)de-mixing and vitrification of solutions of either crystallizable poly(L-lactic acid)(PLLA)or non-crystallizable poly(D/L-lactic acid)(PDLLA)with 50 m%N,N-diethyl-3-methylbenzamide(DEET)were analyzed by calorimetry and cloud-point measurements,which allows drawing conclusions about the effect of polymer stereochemistry on the phase behavior.Regardless of the PLA stereochemistry,vitrification of the solutions on fast cooling,hindering crystallization of PLLA,occurred below-20℃ and suppressed prior L-L de-mixing.The experimental results prove that crystallization in samples containing crystallizable PLLA,observed at around 55℃ on slow cooling,is not preceded by L-L de-mixing. 展开更多
关键词 CRYSTALLIZATION PLA DEET LIQUID-LIQUID PHASE SEPARATION Thermally-induced PHASE separation(TIPS)
High-performance SSZ-13 membranes prepared using ball-milled nanosized seeds for carbon dioxide and nitrogen separations from methane 认领
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作者 Xinping Li Yaowei Wang +4 位作者 Tangyin Wu Shichao Song Bin Wang Shenglai Zhong Rongfei Zhou 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2020年第5期1285-1292,共8页
SSZ-13 membranes with high separation performances were prepared using ball-milled nanosized seeds by once hydrothermal synthesis.Separation performances of SSZ-13 membranes in CO2/CH4 and N2/CH4 mixtures were enhance... SSZ-13 membranes with high separation performances were prepared using ball-milled nanosized seeds by once hydrothermal synthesis.Separation performances of SSZ-13 membranes in CO2/CH4 and N2/CH4 mixtures were enhanced after synthesis modification.Single-gas permeances of CO2,N2 and CH4 and ideal selectivities were recorded through SSZ-13 membranes.The effects of temperature,pressure,feed flow rate and humidity on separation performance of the membranes were discussed.Three membranes prepared after synthesis modifications had an average CO2 permeance of 1.16×10-6 mol·(m2·s·Pa)-1(equal to 3554 GPU)with an average CO2/CH4 selectivity of 213 in a 50 vol%/50 vol%CO2/CH4 mixture.It suggests that membrane synthesis has a good reproducible.The membrane also displayed a N2 permeance of 1.07×10-7 mol·(m2·s·Pa)-1(equal to 320 GPU)with a N2/CH4 selectivity of 13 for a 50 vol%/50 vol%N2/CH4 mixture.SSZ-13 membrane displayed stable and good separation performance in the wet CO2/CH4 mixture for a long test period over 100 h at 348 K.The current SSZ-13 membranes show great potentials for the simultaneous removals of CO2 and N2 in natural gas purification as a facile process suitable for industrial application. 展开更多
关键词 Carbon/methane separation Nitrogen/methane separation CHA membrane Natural gas purification
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Mixed-conducting ceramic–carbonate membranes exhibiting high CO2/O2 permeation flux and stability at high temperatures 认领
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作者 R.ORTEGA-LUGO J.A.FABIAN-ANGUIANO +3 位作者 O.OVALLE-ENCINIA C.GOMEZ-YANEZ B.H.ZEIFERT J.ORTIZ-LANDEROS 《先进陶瓷:英文版》 SCIE CSCD 2020年第1期94-106,共13页
This investigation demonstrates the feasibility to fabricate high quality ceramic–carbonate membranes based on mixed-conducting ceramics.Specifically,it is reported the simultaneous CO2/O2 permeation and stability pr... This investigation demonstrates the feasibility to fabricate high quality ceramic–carbonate membranes based on mixed-conducting ceramics.Specifically,it is reported the simultaneous CO2/O2 permeation and stability properties of membranes constituted by a combination of ceramic and carbonate phases,wherein the microstructure of the ceramic part is composed,in turn,of a mixture of fluorite and perovskite phases.These ceramics showed ionic and electronic conduction,and at the operation temperature,the carbonate phase of the membranes is in liquid state,which allows the transport of CO32-and O2–species via different mechanisms.To fabricate the membranes,the ceramic powders were uniaxially pressed in a disk shape.Then,an incipient sintering treatment was carried out in such a way that a highly porous ceramic was obtained.Afterwards,the piece is densified by the infiltration of molten carbonate.Characterization of the membranes was accomplished by SEM,XRD,and gas permeation techniques among others.Thermal and chemical stability under an atmosphere rich in CO2 was evaluated.CO2/O2 permeation and long-term stability measurements were conducted between 850 and 940℃.The best permeation–separation performance of membranes of about 1 mm thickness,showed a maximum permeance flux of about 4.46×10^–7 mol·m^–2·s^–1·Pa^–1 for CO2 and 2.18×10^–7 mol·m^–2·s^–1·Pa^–1 for O2 at 940℃.Membranes exhibited separation factor values of 150–991 and 49–511 for CO2/N2 and O2/N2 respectively in the studied temperature range.Despite long-term stability test showed certain microstructural changes in the membranes,no significant detriment on the permeation properties was observed along 100 h of continuous operation. 展开更多
关键词 CO2 separation O2 separation ceramic–carbonate membrane SELECTIVITY
Advances in high carbon dioxide separation performance of poly(ethylene oxide)-based membranes 认领
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作者 Samaneh Bandehali Abdolreza Moghadassi +3 位作者 Fahime Parvizian Sayed Mohsen Hosseini Takeshi Matsuura Ezatollah Joudaki 《能源化学:英文版》 SCIE EI CAS CSCD 2020年第7期30-52,I0002,共24页
Poly(ethylene-oxide)(PEO)-based membranes have attracted much attention recently for CO2 separation because CO2 is highly soluble into PEO and shows high selectivity over other gases such as CH4 and N2.Unfortunately,t... Poly(ethylene-oxide)(PEO)-based membranes have attracted much attention recently for CO2 separation because CO2 is highly soluble into PEO and shows high selectivity over other gases such as CH4 and N2.Unfortunately,those membranes are not strong enough mechanically and highly crystalline,which hinders their broader applications for separation membranes.In this review discussions are made,as much in detail as possible,on the strategies to improve gas separation performance of PEO-based membranes.Some of techniques such as synthesis of graft copolymers that contain PEO,cross-linking of polymers and blending with long chains polymers contributed significantly to improvement of membrane.Incorporation of ionic liquids/nanoparticles has also been found effective.However,surface modification of nanoparticles has been done chemically or physically to enhance their compatibility with polymer matrix.As a result of all such efforts,an excellent performance,i.e.,CO2 permeability up to 200 Barrer,CO2/N2 selectivity up to 200 and CO2/CH4 selectivity up to 70,could be achieved.Another method is to introduce functional groups into PEO-based polymers which boosted CO2 permeability up to 200 Barrer with CO2/CH4 selectivity between 40 and 50.The CO2 permeability of PEO-based membranes increases,without much change in selectivity,when the length of ethylene oxide is increased. 展开更多
关键词 Membrane gas separation Molecular design Poly(ethylene oxide) CO2/CH4 separation
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The Use of Process Analysis and Simulation to Identify Paths to Improve the Operation of an Iron Ore Gravity Concentration Circuit 认领
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作者 Maryam Sadeghi Claude Bazin 《化学工程与科学期刊(英文)》 2020年第3期149-170,共22页
The processing of iron ore to recover the valuable iron oxide minerals is commonly carried out using spiral concentrators that separate valuable minerals from non-valuable ones on the basis of the specific gravity of ... The processing of iron ore to recover the valuable iron oxide minerals is commonly carried out using spiral concentrators that separate valuable minerals from non-valuable ones on the basis of the specific gravity of minerals. This paper shows that the analysis of the operation of spirals should not only focus on the minerals (as it is usually the case), but should also consider the particle size of these minerals. Indeed, the sampling of two industrial iron ore circuits and the data processing of the resulting measurements show that unexpectedly about 10% of the coarse heavy iron oxide minerals are not recovered by the spirals of the two circuits. Tests conducted by an independent research center confirm this plant observation. The pilot plant tests also show that the wash water flowrate addition may adversely affect the recovery of coarse heavy mineral particles. A mathematical model for the spiral was implemented into a simulator for an iron ore gravity concentration circuit. The simulator shows a potential 0.7% increase of iron recovery by simply changing the strategy used to distribute the wash water between the rougher and the cleaner/recleaner spirals of the circuit. The simulator also shows that the introduction of a hydraulic classifier into the gravity concentration circuit yields a marginal improvement to the performances of the circuit. 展开更多
关键词 Iron Ore Gravity Separation Spiral Concentrators HEMATITE Hydraulic Clas-sifier Particle Size Partition Curves
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Preparation and Characterization of Magnetic Banana Peels Biochar for Fenton Degradation of Methylene Blue 认领
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作者 Eric Sakué Ngankam Lemankreo Dai-Yang +3 位作者 Baissassou Debina Abdellaziz Baçaoui Abdelrani Yaacoubi Abdoul Ntieche Rahman 《材料科学与应用期刊(英文)》 2020年第6期382-400,共19页
Co-precipitation method was used for the synthesis of biochar/Fe<sub>3</sub>O<sub>4</sub> to heterogeneously degrade methylene blue (MB) in an aqueous medium. This catalyst was characterized by... Co-precipitation method was used for the synthesis of biochar/Fe<sub>3</sub>O<sub>4</sub> to heterogeneously degrade methylene blue (MB) in an aqueous medium. This catalyst was characterized by different techniques such as Fourier Transform Infrared (FTIR) Spectroscopy, X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX) and Raman Microscopy. The analysis highlighted the presence of iron oxides on the surface of the biochar in the form of magnetite (Fe<sub>3</sub>O<sub>4</sub>). Catalytic tests performed on this composite showed significant degradation and simple magnetic separation in the solution for reuse. Maximum degradation was carried out after stirring it for 90 minutes in an MB aqueous solution at different concentrations. The percentages of degradation were 99% and 98.6% 93.3% and 91% for concentrations of MB 40 mg/L and 60 mg/L, 80 mg/L and 120 mg/L respectively. The reactions followed a second-order kinetics with correlation coefficients r<sup>2</sup> = 0.9598, 0.9247, 0.9548 and 0.9614 for the same concentrations of MB at pH = 2, 0.2 mL/L H<sub>2</sub>O<sub>2</sub> and 15 mg of biochar/Fe<sub>3</sub>O<sub>4</sub>. This work provides a simple and an effective method for the preparation of biochar/Fe<sub>3</sub>O<sub>4</sub> and its use for the oxidation of MB by means of heterogeneous Fenton. 展开更多
关键词 CO-PRECIPITATION Magnetic Separation COMPOSITE Heterogeneous Fenton
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Particle mixing behavior of fine coal in density control of gas-solid separation fluidized bed 认领
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作者 Bo Lv Zhenfu Luo +3 位作者 Yanhong Fu Bo Zhang Xingzong Qin Xiangnan Zhu 《颗粒学报:英文版》 SCIE EI CAS CSCD 2020年第3期76-87,共12页
In a gas-solid separation fluidized bed,mixing of fine coal is necessary to achieve a suitable bed density to enable effective separation of low rank coal.On the basis of a variety of mixture models,a gas-solid separa... In a gas-solid separation fluidized bed,mixing of fine coal is necessary to achieve a suitable bed density to enable effective separation of low rank coal.On the basis of a variety of mixture models,a gas-solid separation fluidized bed was judged,where fine coal particles of 0.6-1.0mm were uniformly mixed with magnetite powder.High-speed dynamic camera technology was combined with a slump-sampling method to study the mixing process of the fine coal in the fluidized bed.These results showed that limitations of the fluidized bed structure cause the mixing process to be dominated by lateral diffusion and supplemented by axial diffusion.Axial diffusion was mainly achieved through the ascension of bubbles,whereas lateral diffusion was determined by the bursting action of the gas bubbles at the surface of the bed and the undulating characteristics of the bed.The effective lateral diffusion coefficient increased exponentially with gas velocity but had no strong relationship with the bed height.As the feed point moved toward the center,fine coal began to diffuse to both sides,which shortened the time for the bed density stabilization from 20 to 5 min.The bed density of the layer was stabilized at approximately 1.75 g/cm3.The separation efficiency of the gas-solid separation fluidized bed containing binary mixtures was more obvious for 6-50 mm raw coal,with a probable error E of 0.16. 展开更多
关键词 Gas-solid separation fluidized bed Density control Fine coal Diffusion behavior Separation process
上海庙一号井易泥化煤分选工艺流程的选择 认领
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作者 贾安涛 夏云凯 《煤炭加工与综合利用》 CAS 2020年第2期7-13,I0001共8页
分析了上海庙一号井原煤可选性特点和选煤厂原水洗工艺存在的问题;多次干选半工业性试验结果表明,干选技术可用于分选该矿末煤含量大、矸石易泥化、可选性为易选的原煤,全粒级干选不仅可以稳定和提高末煤质量,还可以生产合格的块精煤产... 分析了上海庙一号井原煤可选性特点和选煤厂原水洗工艺存在的问题;多次干选半工业性试验结果表明,干选技术可用于分选该矿末煤含量大、矸石易泥化、可选性为易选的原煤,全粒级干选不仅可以稳定和提高末煤质量,还可以生产合格的块精煤产品;干法分选不产生煤泥,具有精煤产率高,降灰脱硫效果显著的优势;针对一号井煤质特点和产品质量要求,通过分选对比,确定对现有工艺进行改造,采用干湿结合并联分选工艺流程,取得了改善分选效果、提高经济效益的目的。 展开更多
关键词 选煤厂 易泥化煤 干法分选 干湿并联分选工艺 改造效果
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Analytical Solution for Thermal Flutter of Laminates in Supersonic Speeds 认领
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作者 Qiaozhen Sun 《应用数学与应用物理(英文)》 2020年第8期1525-1534,共10页
<div style="text-align:justify;"> As a basic component of engineering fields such as aeronautics, astronautics and shipbuilding, panel structure has been widely used in engineering and scientific resea... <div style="text-align:justify;"> As a basic component of engineering fields such as aeronautics, astronautics and shipbuilding, panel structure has been widely used in engineering and scientific research. It is of great theoretical and practical significance to study the vibration of panels. The panel flutter problem has caused widely concerned by researchers at home and abroad during to the emergence of high-speed aircrafts. With regard to the eigenvalue problem of rectangular panels, it is generally believed that it is difficult to obtain a closed form eigen solution in the case of an adjacent boundaries clamped-supported or a free boundary that cannot be decoupled. Aiming at the problem, this paper studies the two-dimensional symmetric orthogonal laminated plate structure in the hypersonic flow in the thermal environment, and combines the first-order piston aerodynamic theory to study a high-precision separation variable method. Through this method, analytical solution to the closed form of the thermal flutter problem of rectangular panels can be obtained under any homogeneous boundary conditions. </div> 展开更多
关键词 Two-Dimensional Panel Thermal Flutter Separation Variable Method Analytical Solution
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Isobars Separation (<sup>137</sup>Cs-<sup>137m</sup>Ba-<sup>137</sup>Ba) from Marine Sediments, in Order to Evaluate Directly Their Radioactive Contamination by Mass Spectrometry 认领
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作者 Karla Fernández Juan Manuel Navarrete +2 位作者 Miguel Angel Zúñ iga Ernesto Hernández 《核科学与技术国际期刊(英文)》 2020年第1期32-38,共7页
Marine sediments contamination by fission product 137Cs-137mBa is a fact since the period 1945-65, when plus than two thousand atomic explosion tests were performed mainly in the southern seas, earth region with minor... Marine sediments contamination by fission product 137Cs-137mBa is a fact since the period 1945-65, when plus than two thousand atomic explosion tests were performed mainly in the southern seas, earth region with minor population density. However, marine flows have produced dissemination of this radioactive pair through the sea bottom all over the world, at different levels, because the sea movement and natural decaying of radioactive pair: parent 137Cs (t1/2 = 30.17 years) and daughter 137mBa (t1/2 = 2.55 minutes). Radioactive detection of these contaminants, compared as percentage with that of natural 40K (t1/2 = 1.28 × 109 years, 0.0118% of elementary K) leads to radiation contamination factor (RCF), as one possible unit to measure the radioactive contamination intensity in different regions, as well to determine if there is some other possible source of this contaminant, for example water cooling from power nuclear reactors when it is discharged at sea. However, radioactive detection always implies an unavoidable statistical variation, which makes more difficult to appreciate the changes as function of time and region. But at beginning of this century, mass spectrometry has got impressive advances, which makes it much more precise and sensible than radioactive detection [1]. This paper attempts to measure with other units the radioactive contamination: 137Cs atoms number per gram of sample, instead radioactivity, which could be more direct and with minor standard deviation that radioactive detection, solving at same time the isobars separation: 137Cs versus 137mBa plus elementary 137Ba (11.23% of Ba element). 展开更多
关键词 Isobars SEPARATION 137Cs-137mBa-137Ba
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撞击流式反应器内水合物法分离沼气中CO2研究 认领
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作者 方书起 张欣悦 +2 位作者 李思齐 白东豪 白净 《化工学报》 EI CAS CSCD 北大核心 2020年第5期2099-2108,F0003共11页
实验考察了撞击流式反应釜内水合物法分离沼气中CO2的特性。选取纯水和十二烷基硫酸钠(SDS)两个不同的体系,考察了水合物生成过程中压力、温度、撞击强度的影响。实验结果表明在纯水体系和SDS体系下压力的升高均有利于水合物的快速生成... 实验考察了撞击流式反应釜内水合物法分离沼气中CO2的特性。选取纯水和十二烷基硫酸钠(SDS)两个不同的体系,考察了水合物生成过程中压力、温度、撞击强度的影响。实验结果表明在纯水体系和SDS体系下压力的升高均有利于水合物的快速生成,但并不利于沼气中的二氧化碳捕集;实验通过改变撞击流式反应器的撞击强度发现,当撞击强度为0.128时,CO2分离因子(S.F.)在纯水和SDS两种体系下均达到最大,纯水体系下S.F.的最大值为138.9,SDS体系下S.F.的最大值为64.5;实验结果表明添加剂SDS可以促进水合物的生成,最适宜的浓度为600 mg/L,此时耗气量、CO2水合率S.Fr.(CO2)和CH4水合率S.Fr.(CH4)达到最大,但SDS对CH4水合物生成过程的促进作用大于CO2水合物,反而不利于CO2的分离,降低CO2的分离因子。 展开更多
关键词 水合物 沼气 分离 二氧化碳捕集 分离因子
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文章速递电渗析-超滤耦合技术研究进展 认领
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作者 苏慧超 张田明 +1 位作者 吴云奇 徐国荣 《化工进展》 EI CAS CSCD 北大核心 2020年第S02期1-7,共7页
电渗析-超滤耦合技术(EDUF)是一项用于分离带电有机物的新型技术,用超滤膜替换一部分离子交换膜,或将超滤膜嵌入到传统电渗析器中,从而形成一种超滤与电渗析内部结合的新型分离技术。该技术一方面利用超滤膜的孔径差异性分离不同分子量... 电渗析-超滤耦合技术(EDUF)是一项用于分离带电有机物的新型技术,用超滤膜替换一部分离子交换膜,或将超滤膜嵌入到传统电渗析器中,从而形成一种超滤与电渗析内部结合的新型分离技术。该技术一方面利用超滤膜的孔径差异性分离不同分子量的带电有机物,另一方面利用电驱动原理克服压力驱动式超滤膜的膜污染问题,在营养食品、生物制药等领域用于分离提纯活性有机物组分,展示出了良好的应用优势。本文聚焦于电渗析-超滤耦合技术的产生和发展,详细介绍了该技术的技术原理及应用优势,重点阐述了影响其分离效率的主要因素,包括pH、超滤膜切割分子量(MWCO)、电场强度、膜对结构等。最后,从提高分离效率、降低系统能耗、超滤膜材质、水解液预处理、系统泄漏等角度提出了未来的研究方向,为该技术的研究和应用提供指导。 展开更多
关键词 电渗析 超滤 耦合 有机物 分离
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新型离子交换纤维材料的应用研究进展 认领
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作者 代立波 冯韧 赵宏亮 《化工技术与开发》 CAS 2020年第10期23-25,共3页
离子交换纤维是一类具有吸附分离作用的功能材料。本文结合近年来离子交换纤维在废水处理、空气净化、食品医药等领域的应用现状进行分析和总结,以期为新型功能纤维材料的性能评价提供参考。
关键词 离子交换纤维 应用研究 进展
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