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双蒸发器汽车空调系统制冷性能分析与优化 被引量:3
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作者 李耀和 张成明 《中国新技术新产品》 2014年第9期123-124,共2页
本文介绍了双蒸发器汽车空调制冷性能的环模模拟测试及分析,并优化系统设计,提高制冷性能,为双蒸发器空调系统系统设计提供可参考的案例。
关键词 汽车空调 双蒸发器 环模实验 性能优化
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冷却系统设计与开发 被引量:1
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作者 闭兰兰 王许梅 《时代汽车》 2021年第14期110-111,共2页
本文针对汽车冷却系统的设计与开发做相关介绍(仅介绍燃油车),介绍内容包括整车冷却系统的设计开发流程、冷却系统工作原理及相关零部件介绍和环模实验。不同车企采用的冷却策略和实验标准各有千秋,本文的介绍不具通用代表性,请读者按... 本文针对汽车冷却系统的设计与开发做相关介绍(仅介绍燃油车),介绍内容包括整车冷却系统的设计开发流程、冷却系统工作原理及相关零部件介绍和环模实验。不同车企采用的冷却策略和实验标准各有千秋,本文的介绍不具通用代表性,请读者按需采纳借鉴。 展开更多
关键词 开发流程 冷却系统 环模实验
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Study on Diffusion of Hydrocarbons in FAU and MFI Zeolites by Molecular Simulation and Related Experiments 被引量:3
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作者 Yuan Shuai Liu Yujian +4 位作者 Tian Huiping Dai Zhenyu Zhao Yi Zhou Han Long Jun 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2012年第4期1-8,共8页
The diffusion of C4-24 alkanes, aromatics and cycloalkanes in FAU and MFI zeolites were studied systemati- cally by molecular simulation. The basic data on diffusion energy barriers and the diffusion characteristics o... The diffusion of C4-24 alkanes, aromatics and cycloalkanes in FAU and MFI zeolites were studied systemati- cally by molecular simulation. The basic data on diffusion energy barriers and the diffusion characteristics of alkanes, cyclo- alkanes and aromatics in FAU and MFI zeolites were obtained. It was found out that the 12-member-ring openings between the two adjacent super cages limited the diffusion of hydrocarbons in FAU zeolites, and the hydrocarbon molecules diffused more easily in the intersections of MFI zeolite channels than in the straight channels between the intersections. It was more difficult for the molecules to diffuse in the sinusoidal channel of the MFI zeolite than in the straight channel because of the atoms at the comer of sinusoidal channel. The diffusion of three kinds of C6 alkanes was studied by gravity sorption method. The simulation results were well consistent with the experimental results, indicating that the simulation results were con- vincing. 展开更多
关键词 hydrocarbons DIFFUSION FAU MFI
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Symmetry Reductions of a 1.5-Layer Ocean Circulation Model
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作者 HUANG Fei 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第5X期895-900,共6页
The (2+1)-dimensional nonlinear 1.5-layer ocean circulation model without external wind stress forcing is analyzed by using the classical Lie group approach. Some Lie point symmetries and their corresponding two-di... The (2+1)-dimensional nonlinear 1.5-layer ocean circulation model without external wind stress forcing is analyzed by using the classical Lie group approach. Some Lie point symmetries and their corresponding two-dimensional reduction equations are obtained. 展开更多
关键词 SYMMETRY similarity reductions 1.5-layer ocean circulation model
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Simulated Heat Sink in the Southern Ocean and Its Contribution to the Recent Hiatus Decade
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作者 OU Nian-Sen LIN Yi-Hua BI Xun-Qiang 《Atmospheric and Oceanic Science Letters》 CSCD 2015年第3期174-178,共5页
A set of numerical experiments is designed and carried out to understand a heat sink in the Southern Ocean in the recent hiatus decade. By using an oceanic general circulation model, the authors focus on the contribut... A set of numerical experiments is designed and carried out to understand a heat sink in the Southern Ocean in the recent hiatus decade. By using an oceanic general circulation model, the authors focus on the contributions from two types of forcing: wind stress and thermohaline forcing. The simulated results show that the heat sink in the upper Southern Ocean comes mainly from thermohaline forcing; while in the deeper layers, wind stress forcing also plays an important role. These different contributions may be due to different physical processes for the heat budget. The combination of these two types of forcing shows a significant heat sink in the Southern Ocean in the recent hiatus decade, and this is consistent with the observations and conclusions of a similar recently published study. 展开更多
关键词 heat sink Southem Ocean wind stress forc- ing thermohaline forcing OGCM
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Decision Model of Knowledge Transfer in Big Data Environment 被引量:7
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作者 Chuanrong Wu Yingwu Chen Feng Li 《China Communications》 SCIE CSCD 2016年第7期100-107,共8页
A decision model of knowledge transfer is presented on the basis of the characteristics of knowledge transfer in a big data environment.This model can determine the weight of knowledge transferred from another enterpr... A decision model of knowledge transfer is presented on the basis of the characteristics of knowledge transfer in a big data environment.This model can determine the weight of knowledge transferred from another enterprise or from a big data provider.Numerous simulation experiments are implemented to test the efficiency of the optimization model.Simulation experiment results show that when increasing the weight of knowledge from big data knowledge provider,the total discount expectation of profits will increase,and the transfer cost will be reduced.The calculated results are in accordance with the actual economic situation.The optimization model can provide useful decision support for enterprises in a big data environment. 展开更多
关键词 big data knowledge transfer optimization simulation dynamic network
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Effects of temperature,algae biomass and ambient nutrient on the absorption of dissolved nitrogen and phosphate by Rhodophyte Gracilaria asiatica 被引量:2
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作者 杜荣斌 刘立明 +1 位作者 王爱敏 王勇强 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2013年第2期353-365,共13页
Gracilaria asiatica, being highly efficient in nutrient absorption, is cultivated in sea cucumber ponds to remove nutrients such as nitrogen and phosphate. It was cultured in a laboratory simulating field conditions, ... Gracilaria asiatica, being highly efficient in nutrient absorption, is cultivated in sea cucumber ponds to remove nutrients such as nitrogen and phosphate. It was cultured in a laboratory simulating field conditions, and its nutrient absorption was measured to evaluate effects of environmental conditions. Ammonia nitrogen (AN), nitrate nitrogen (NN), total inorganic nitrogen (TIN), and soluble reactive phosphorus (SRP) uptake rate and removal efficiency were determined in a 4~2 factorial design experiment in water temperatures (T) at 15~C and 25~C, algae biomass (AB) at 0.5 g/L and 1.0 g/L, total inorganic nitrogen (TIN) at 30 ~tmol/L and 60 ~tmol/L, and soluble reactive phosphorus (SRP) at 3 and 6 ~tmol/L. AB and ambient TIN or SRP levels significantly affected uptake rate and removal efficiency of AN, NN, TIN, and SRP (P〈0.001). G. asiatica in AB of 0.5 g/L showed higher uptake rate and lower removal efficiency relative to that with AB of 1.0 g/L. Nitrogen and phosphorus uptake rate rose with increasing ambient nutrient concentrations; nutrient removal efficiency decreased at higher environmental nutrient concentrations. The algae preferred to absorb AN to NN. Uptake rates of AN, NN, and SRP were significantly affected by temperature (P〈0.001); uptake rate was higher for the 25~C group than for the 15~C group at the initial experiment stage. Only the removal efficiency of AN and SRP showed a significant difference between the two temperature groups (P〈0.01). The four factors had significant interactive effects on absorption of N and P, implying that G. asiatica has great bioremedial potential in sea cucumber culture ponds. 展开更多
关键词 ALGAE Gracilaria asiatica Chang et Xia nutrient removal NITROGEN soluble reactive phosphate
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Numerical Study of the Secondary Circulations in Rip Current Systems 被引量:1
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作者 LI Rui GUAN Changlong 《Journal of Ocean University of China》 SCIE CAS 2015年第1期9-16,共8页
To investigate the mechanism of secondary circulations in rip current systems, and to explore the relationship between wave conditions and secondary circulation intensity, a series of numerical experiments is performe... To investigate the mechanism of secondary circulations in rip current systems, and to explore the relationship between wave conditions and secondary circulation intensity, a series of numerical experiments is performed using coupled nearshore wave model and circulation model. In these experiments, the rip currents and secondary circulations generated above barred beaches with rip channels are simulated. A comparison experiment is conducted to investigate the formation and hydrodynamics of the secondary circulations. Model results indicate that the secondary circulations consist of alongshore flows driven by wave set-up near the shoreline, part of the feeder currents driven by the wave set-up over the bars, and onshore flows at the end of the rip channel driven by wave breaking and convection. The existence of the secondary circulation barely affects the rip current, but narrows and intensifies the feeder currents. Three groups of experiments of varying incident wave conditions are performed to investigate the relationship between wave conditions and secondary circulation intensity. The velocity of the alongshore flow of the secondary circulation is sensitive to the variation of the incident wave height and water depth. It is also found that the alongshore flow intensity is in direct proportion to the alongshore variation of the wave height gradient between the bars and the shoreline. 展开更多
关键词 secondary circulation rip current WAVES radiation stress
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Conversion of Fuel-N to N2O and NOx during Coal Combustion in Combustors of Different Scale 被引量:3
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作者 周昊 黄燕 +2 位作者 莫桂源 廖子昱 岑可法 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2013年第9期999-1006,共8页
With focus on investigating the effect of combustor scale on the conversion of fuel-N to NOx and N20, experiments are carried out in three combustors, including single coal particle combustion test rig, laboratory sca... With focus on investigating the effect of combustor scale on the conversion of fuel-N to NOx and N20, experiments are carried out in three combustors, including single coal particle combustion test rig, laboratory scale circulating fluidized-bed boiler (CFB) and full scale CFB in this work. For single coal particle combustion, the majority of f-uel-N (65%-82%) is released as NOx, while only a little (less than 8%) fuel-N yields N20. But in labora- tory scale CFB, the conversion of fuel-N to N20 is increases, but the conversion of fuel-N to NOx is quite less than that of single coal particle combustion. This is because much char in CFB can promote the NOx reduction by in- creasing N20 formation. In full scale CFB, both of the conversion of fuel-N to NOx and the conversion of fuel-N to N20 are smaller than laboratory scale CFB. 展开更多
关键词 fuel-N N2O NOx COAL fluidized bed
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Modeling and analysis of gradual hybrid anti-worm
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作者 李军群 秦拯 +3 位作者 欧露 O.Salman A.X.Liu 杨金民 《Journal of Central South University》 SCIE EI CAS 2011年第6期2050-2055,共6页
The gradual hybrid anti-worm (GHAW) was presented. percentage of vulnerable hosts present in the network. For GHAW It changed its confrontation scheme in real time according to the its process of countering maliciou... The gradual hybrid anti-worm (GHAW) was presented. percentage of vulnerable hosts present in the network. For GHAW It changed its confrontation scheme in real time according to the its process of countering malicious internet worms was modeled. The performance of GHAW on two factors was also estimated: confronting validity against worms and consumption of network resources. Factors governing its performance, specifically the transformation threshold and the transformation rate, were analyzed. The simulation experiments show that GHAW has dynamical adaptability to changes of network conditions and offers the same level of effectiveness on confronting internet worms as the divide-and-rule hybrid anti-worm, with significantly less cost to network resources. The experiments also indicate that the transformation threshold is the key factor affecting the performance of GHAW. 展开更多
关键词 network security internet worm anti-worm vulnerable host propagation model
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An Environmental Wind Tunnel Laboratory of SP
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作者 姚增权 《Electricity》 2002年第2期38-42,共5页
This paper briefs the background and process of setting-up andupdating of Environmental Wind Tunnel Laboratory of State Power Corporation,details the environmental wind tunnel, completed measuring instruments andequip... This paper briefs the background and process of setting-up andupdating of Environmental Wind Tunnel Laboratory of State Power Corporation,details the environmental wind tunnel, completed measuring instruments andequipment of the laboratory, and also describes the experimental projects thePower Environmental Protection Research Institute has completed, theexperiences gained and the services the Institute can provide in the future.[ 展开更多
关键词 environmental wind tunnel LABORATORY physical simulation
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Effect of galvanic contact on the flotability of galena in the presence and absence of a collector 被引量:1
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作者 M.B.Eslami Andargoli S.Jannesar Malakooti +1 位作者 F.Doulati Ardejani H.Abdollahi 《International Journal of Mining Science and Technology》 SCIE EI 2012年第5期629-632,共4页
In this paper,the effect of various electrochemical environments in the galena flotation is investigated.The electrochemical environments consisted of a ball mill for grinding of galena ore and a Denver flotation cell... In this paper,the effect of various electrochemical environments in the galena flotation is investigated.The electrochemical environments consisted of a ball mill for grinding of galena ore and a Denver flotation cell for flotation of galena in the laboratory scale.In order to achieve the maximum recovery with sodium hyposulfite,the concentrations of 0.06 and 0.12 M of air and nitrogen gases have been used to control the pulp potential in the Denver flotation cell.The galena sample was from the ''Era mine'' which is located in the Kiyasar area,north of Iran.This mine contains:Galena(PbS) at least 22%,Fluorite(CaF 2) 73.37%,Quartz(SiO 2) 2.54% and other minerals such as Cerussite(PbCO 3) and Kaolinite(Al 2 Si 2 O 5(OH) 4).Flotation of Galena was conducted in a 0.12 M of sodium hyposulfite solution.It was found that the amount of recovery by this process was 85% and 63% in the presence and absence of potassium amyl xanthate(KAX) and at an estimated potential of 280 to 350 mV respectively while the recovery was 70% and 52% at an approximate potential of 175 to 210 mV in water in the presence and absence of collector(KAX). 展开更多
关键词 Flotation Collector Galena Electrochemical Galvanic interactions
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Arctic Oscillation Responses to Black Carbon Aerosols Emitted from Major Regions
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作者 WAN Jiang-Hua LI Shuanglin 《Atmospheric and Oceanic Science Letters》 CSCD 2015年第4期226-232,共7页
The responses of the Arctic Oscillation(AO) to global black carbon(BC) and BC emitted from major regions were compared using the atmospheric general circulation model Geophysical Fluid Dynamics Laboratory(GFDL) atmosp... The responses of the Arctic Oscillation(AO) to global black carbon(BC) and BC emitted from major regions were compared using the atmospheric general circulation model Geophysical Fluid Dynamics Laboratory(GFDL) atmospheric general circulation model(AGCM) Atmospheric Model version 2.1(AM2.1). The results indicated that global BC could induce positive-phase AO responses, characterized by negative responses over the polar cap on 500 h Pa height fields, and zonal mean sea level pressure(SLP) decreasing while zonal wind increasing at 60°, with the opposite responses over midlatitudes. The AO indices distribution also shifted towards positive values. East Asian BC had similar impacts to that of global BC, while the responses to European BC were of opposite sign. South Asian BC and North American BC did not affect the AO significantly. Based on a simple linear assumption, we roughly estimated that the global BC emission increase could explain approximately 5% of the observed positive AO trend of +0.32 per decade during 1960 to 2000. 展开更多
关键词 black carbon Arctic Oscillation linear trend
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Fuzzy Modeling in Environmental Geotechnics
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作者 A.B. Lolaev 《Journal of Environmental Science and Engineering》 2010年第12期77-84,共8页
High level of industrialization of northern regions of Russia cause significant pollution problems in the soil. The new approach based on fuzzy modeling for reception and processing of the geocryological information i... High level of industrialization of northern regions of Russia cause significant pollution problems in the soil. The new approach based on fuzzy modeling for reception and processing of the geocryological information is offered. The technique and methodology of presentation of variables in a logic and linguistic way in a combination to elements of the experimental planning theory is developed. Comparison of the calculated data on model has shown its high adequacy of the experimental data of the various authors. The forecast of geoecological processes in cryolitozone on the basis of the described method will allow increasing reliability of the accepted design decisions. 展开更多
关键词 Environmental geotechnics PERMAFROST fuzzy modeling
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Biomass Vapogasification in Fluidized Bed: Modelling of Char Population Balance and Experimental Validation
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作者 Marc Detoumay Mehrdji Hemati 《Journal of Chemistry and Chemical Engineering》 2010年第12期38-51,共14页
The article presents a population balance model by mass developed for studying char gasification by steam occuring in a fluidized bed. The model has been validated by comparison with existing theoretical and experimen... The article presents a population balance model by mass developed for studying char gasification by steam occuring in a fluidized bed. The model has been validated by comparison with existing theoretical and experimental cases. Its main goal is to have a better understanding on particles size distribution behaviour during operation of the fluidized bed, and in particular to be applied on the case of Fast Internally Circulating Fluidized Beds for char gasification. Results have shown that the initial properties of the fluidized bed particles (bed and size distribution) are almost not involved in the steady state obtained in continous operation, which is excusively dependent on the properties of the fed particles flow rate and size distribution, the withdrawal flow rate and the reaction properties. Morevoer, it has been proven that the steady state fluidized bed mass and size distribution may be theroretically controlled by an adequate choice of feeding and withdrawal flow rates. 展开更多
关键词 Population balance size distribution steam gasification BIOMASS CHAR particles.
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Experimental Investigation and Numerical Simulation for Bacteria Transport in Soil
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作者 廉景燕 刘天雨 张瑞玲 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第2期327-333,共7页
A thorough understanding of bacteria transport in soil and groundwater is vital to the successful practice of environmental bioremediation.In this work,a dual-process adsorption with growth and decay model of bacteria... A thorough understanding of bacteria transport in soil and groundwater is vital to the successful practice of environmental bioremediation.In this work,a dual-process adsorption with growth and decay model of bacterial transport was proposed.The onsite soil and the high efficiency methyl tertbutyl ether (MTBE) degrading bacterium Chryseobacterium sp.A-3,was used in the experiments.The model was validated using one-dimensional soil column experiments.The results show that the dual-process adsorption with growth and decay model proposed well describes the migration mechanism of microorganisms in soil and groundwater environment.According to the model analysis and simulation,the bacterial transport is enhanced as flow velocity and inlet cell concentration increase.Compared with the contaminant MTBE,the bacteria show stronger transport capacity but the irreversible straining in soil prevents the bacteria from transporting longer than MTBE.The results have certain instructive significance to the insitu contamination remediation operation. 展开更多
关键词 BACTERIA TRANSPORT SOIL MTBE simulation
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Nutrient-controlled growth of Skeletonema costatum : an applied model
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作者 孙科 丘仲锋 +1 位作者 何宜军 尹宝树 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2014年第3期608-625,共18页
To model Skeletonema costatum blooms and their relationship with environmental parameters in situ, a S. costatum-specific zero-dimensional box model based on the mechanistic model Eco3M was established using physiolog... To model Skeletonema costatum blooms and their relationship with environmental parameters in situ, a S. costatum-specific zero-dimensional box model based on the mechanistic model Eco3M was established using physiological features. The parameters were calibrated using experimental counterparts, and simulations were compared with published laboratory findings. The resulting normalized objective function (NOF) values are less than 1.0 (and in most cases less than 0.58) and the values for the slope y (between 0.656 7-1.127 4) and R2 (between 0.806 8-0.971) are close to 1.0 for most of the sub-figures. This indicates good agreement between simulated and measured data and suggests that the model reproduces the general characteristics of S. costatum growth and use of nutrients under different N- or P-limiting conditions. The model is appropriate for further applications and can be used to test more scenarios using other nutrients. 展开更多
关键词 Skeletonema costatum red tide algal bloom MODELING GROWTH China Sea
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Influence of the Hydriding Cycles on U-IOMo Alloy Comminution Process
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作者 Kelly Cristina Martins Faeda Ana Maria Matildes dos Santo~ Tercio Assuncao Pedrosa Natalia Mattar Cantagalli Femando Soares Lameiras t Wilmar Barbosa Ferraz 《Journal of Energy and Power Engineering》 2014年第9期1559-1567,共9页
Hydriding-dehydriding process has been widely employed to comminute uranium alloys. Developments have been made to improve this process because it is a cheaper way to obtain powder of uranium alloys compared to the ot... Hydriding-dehydriding process has been widely employed to comminute uranium alloys. Developments have been made to improve this process because it is a cheaper way to obtain powder of uranium alloys compared to the other methods, such as atomization. This work presented an innovative comminution process of U-10Mo alloy in laboratory scale where a Sievert type equipment was utilized and only hydriding cycles were employed without repetition of the dehydriding procedure. Experiments of comminution of the U-10Mo alloy were carried out by employing alloy samples which were submitted to different heat treatment conditions and, subsequently, to different hydriding cycles. The heat treatments considered were hot rolled at 800 ℃, homogenization at 900 ℃ or 1,000 ℃ and aging at 520℃. It was observed that the number of hydriding cycles and heat treatment conditions have influenced the particle size distributions. Samples that were hot-rolled, homogenized at 1,000 ℃ and aged, and comminuted with five cycles of hydriding have produced powders with particle size distribution more uniform with the major quantity of particles in the range from 50μm to 200 μm while the other conditions have obtained a great quantity above 200 μm. 展开更多
关键词 Hydriding-dehydriding process U-Mo alloys comminution process hydriding-dehydriding cycles.
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Experimental Study on Combustion Characteristics and NOX Emissions of Pulverized Anthracite Preheated by Circulating Fluidized Bed 被引量:18
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作者 WANG Jun ZHU Jian-guo LU Qing-gang 《Journal of Thermal Science》 SCIE EI CAS CSCD 2011年第4期355-361,共7页
A 30 kW bench-scale rig of pulverized anthracite combustion preheated by a circulating fluidized bed (CFB) was developed. The CFB riser has a diameter of 90 mm and a height of 1,500 mm. The down-fired combustion cha... A 30 kW bench-scale rig of pulverized anthracite combustion preheated by a circulating fluidized bed (CFB) was developed. The CFB riser has a diameter of 90 mm and a height of 1,500 mm. The down-fired combustion chamber (DFCC) has a diameter of 260 mm and a height of 3,000 mm. Combustion experiments were carded out using pulverized anthracite with 6.74% volatile content. This low volatile coal is difficult to ignite and burn out. Therefore, it requires longer burnout time and higher combustion temperature, which results in larger NOx emis- sions. In the current study, important factors that influence the combustion characteristics and NOx emissions were investigated such as excess air ratio, air ratio in the reducing zone, and fuel residence time in the reducing zone. Pulverized anthracite can be quickly preheated up to 800~C in CFB when the primary air is 24% of theo- retical air for combustion, and the temperature profile is uniform in DFCC. The combustion efficiency is 94.2%, which is competitive with other anthracite combustion technologies. When the excess air ratio ranges from 1.26 to 1.67, the coal-N conversion ratio is less than 32% and the NOx emission concentration is less than 371 mg/m^3 (@6% O2). When the air ratio in the reducing zone is 0.12, the NOx concentration is 221 mg/m^3 (@6% O2), and the coal-N conversion ratio is 21%, which is much lower than that of other boilers. 展开更多
关键词 circulating fluidized bed preheat pulverized anthracite NOx
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Chloride ion ingress distribution within an alternate wetting-drying marine environment area 被引量:3
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作者 XU Chen LI ZhiYuan +2 位作者 JIN WeiLiang ZHANG Yi YAO ChangJian 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第4期970-976,共7页
Concrete structures in an alternate wetting-drying area often suffer from severe chloride ion ingress more than those in other areas. Field tests of marine structures were conducted, and chloride concentration is foun... Concrete structures in an alternate wetting-drying area often suffer from severe chloride ion ingress more than those in other areas. Field tests of marine structures were conducted, and chloride concentration is found to reach a maximum value at a certain elevation. The surface concentration and diffusion coefficient of chloride ions at different elevations exhibit Gaussian unimodal curve distributions. Using the chloride ion unsaturated permeability model, the distribution regularity mechanism is analyzed. Finally, an improved indoor accelerated simulation experiment is proposed to simulate the rules governing chloride ion ingress into concrete structures in an alternate wetting-drying area. 展开更多
关键词 concrete DURABILITY CHLORIDE
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