期刊文献+
共找到5,025篇文章
< 1 2 250 >
每页显示 20 50 100
The Design of an Air Rower That Can Purify Indoor Air
1
作者 Shuyao Fan 《Open Journal of Applied Sciences》 2024年第7期1843-1850,共8页
To solve the problem that utilizing an air rower lowers indoor air quality due to the dust stirred up in the course of rowing, an air rower is designed to have the extra function of air purifying. The designed rower i... To solve the problem that utilizing an air rower lowers indoor air quality due to the dust stirred up in the course of rowing, an air rower is designed to have the extra function of air purifying. The designed rower is composed of six parts, which are the frame, air generator, transmission part, air purifying filter cartridge, performance monitor, and electric motor. To fulfill the task, the filter cartridge is vertically arranged to lead the air to enter from the lower part and vent out of the upper part to filter and purify the air before it enters the generator so as that the indoor air is well circulated to improve the air purification effect when the rower is utilizing. The modular detachable design allows the air filter and electric motor to be installed and disassembled to adapt to different air purification needs. The designed rower has the benefit of lower purchasing cost and energy saving that may motivate exercising, bringing more fun and the sense of accomplishment. 展开更多
关键词 air Rower air Quality Purify Modular design BENEFITS
下载PDF
基于Design-Expert优化一款中药空气抑菌剂配方的研究
2
作者 黄晓珊 王亚琴 +5 位作者 卢佳佳 曾俊棠 黄烁 范宇梦 吕立铭 李大炜 《江西化工》 CAS 2024年第1期63-67,共5页
目的:以多种中药挥发油作为原料,开发一款高效广谱抑菌的空气抑菌剂。方法:选取丁香、艾叶、香茅3种挥发油,采用Design-Expert 12.0中自带的Optimal(custom)试验设计进行最优混料配方筛选试验。通过采样我校饭堂空间空气浮游菌,先按软... 目的:以多种中药挥发油作为原料,开发一款高效广谱抑菌的空气抑菌剂。方法:选取丁香、艾叶、香茅3种挥发油,采用Design-Expert 12.0中自带的Optimal(custom)试验设计进行最优混料配方筛选试验。通过采样我校饭堂空间空气浮游菌,先按软件设计配方加样抑菌孵育并计数,再拟合出孵育菌落数与各挥发油配方比例的模型方程,最后计算出最佳抑菌效能配方比例,并采用实验室试验和现场试验验证优选配方。结果:利用286组抑菌孵育数据计算得出,孵育菌落数(Y)与各挥发油配方比例之间的拟合方程为Y=17.60A+53.01B+36.76C-106.11AB-84.87AC-63.93BC+782.79A^(2)BC-1178.89AB^(2)C+413.15ABC2。丁香与艾叶、香茅挥发油抑菌的交互作用对孵育菌落数量有显著影响(p<0.05)。最终选择的丁香、艾叶、香茅挥发油比例为45.2:41.6:13.2,该配方的实验室试验和现场试验验证了其抑菌效能良好。结论:中药抑菌挥发油复配后具有明显的增效作用。该配方的空气抑菌剂抑菌效果明显,气味芳香易于被人们接受,具有良好的市场前景和推广价值。 展开更多
关键词 中药挥发油 空气抑菌剂 最优混料设计 抑菌试验
下载PDF
INTEGRATED DESIGN OF AN ELECTRIC POWERED UNMANNED AIR VEHICLE USING CONCURRENT SUBSPACE DESIGN 被引量:1
3
作者 余雄庆 MarcA.Stelmack StephenM.Batill 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2000年第2期140-149,共10页
The concurrent subspace design (CSD) framework has been used to conduct a preliminary design optimization of an electric powered, unmanned air vehicle (EPUAV) operating at a low Reynolds number. A multidisciplinary sy... The concurrent subspace design (CSD) framework has been used to conduct a preliminary design optimization of an electric powered, unmanned air vehicle (EPUAV) operating at a low Reynolds number. A multidisciplinary system analysis that includes aerodynamics, weights, propulsion, performance and stability and control has been developed for this class of vehicles. The CSD framework employs artificial neural network based response surfaces to provide approximations to the design space. The EPUAV system includes 25 continuous and 4 discrete design variables. The CSD framework was able to identify feasible designs with significant weight reductions relative to any previously considered (i.e. initial database) designs. This was accomplished with a limited number of system analyses. The results also demonstrate the nature of this design framework adaptive to changes in design requirements. 展开更多
关键词 aircraft design multidisciplinary design optimization unmanned air vehicle OPTIMIZATION
下载PDF
Planting Design of Urban Air Farm
4
作者 王艳 许先升 《Journal of Landscape Research》 2011年第2期7-9,13,共4页
Air farm could provide urban people with a beautiful place to release working pressure,remove troubles,cultivate moral character and long for future.It was of practical value.The paper had analyzed the tendency and ne... Air farm could provide urban people with a beautiful place to release working pressure,remove troubles,cultivate moral character and long for future.It was of practical value.The paper had analyzed the tendency and necessity to construct air farm and put forward limiting factors and favorable factors for construction of air farm.Limiting factors were:① man-made planting soil had separated plants from the earth,restricting the supply of underground water;② plants on roof had weak capacity resisting to wind.Favorable factors were fresh air,good light and large temperature difference between day and night,which were beneficial for growth of plants.Based on domestic planting of blueberry,starting from the angles of good visual appearance,ecological effect and economic effect,four planting methods of blueberry had been proposed,which were standard planting,landscape planting,greenhouse planting,and combination planting.It hoped to apply new techniques,new materials and research results in practical design of air farm as far as possible. 展开更多
关键词 CITY air FARM PLANTING design
下载PDF
Virtual design and performance prediction of a silencing air cleaner used in an I.C.engine intake system 被引量:4
5
作者 郝志勇 贾维新 方芳 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第10期1107-1114,共8页
This paper reports results of the authors’ studies on the virtual design method used in the development of low noise intake system of I.C. engine. The resulting high pass-by noise at level above the legislative targe... This paper reports results of the authors’ studies on the virtual design method used in the development of low noise intake system of I.C. engine. The resulting high pass-by noise at level above the legislative target at full throttle when engine speed was around 5200 r/min necessitated a BEM-aided redesign task, following the typical process of design and development of an intake system. During the initial design, based on the acoustic theory and the requirements (1. The air flux of the redesigned should equal to or exceed the value of the original flux; 2. The filtering area must not be degraded), and considering the constraint of space in the engine compartment, total volume and rough internal dimensions were determined. During the detailed design, the exact internal dimensions of the air cleaner were determined, and an effective method was applied to improve the acoustic performance at low frequency. The predicted sound power of the intake system indicated that the objective of reducing the overall engine noise by minimizing intake system noise was achieved. 展开更多
关键词 Virtual design Acoustic performance Silencing air cleaner Boundary element method (BEM)
下载PDF
Analysis on Potential Conflict Frequency of Intersected Air Routes in Terminal Airspace Design 被引量:1
6
作者 王超 韩邦村 刘菲 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2014年第5期580-588,共9页
In order to obtain accurate conflict risks in terminal airspace design,the concept and calculation model of potential conflict frequency for intersected routes are proposed.Conflict frequency is represented by the pro... In order to obtain accurate conflict risks in terminal airspace design,the concept and calculation model of potential conflict frequency for intersected routes are proposed.Conflict frequency is represented by the product of horizontal conflict frequency and vertical conflict probability.The horizontal conflict frequency is derived from the probability density distribution of conflicts in a period of time.Based on the recorded radar trajectory data,the concept and model of ROUTE distance are proposed,and the probability density function of aircraft height at a specified ROUTE distance is deduced by kernel density estimation.Furthermore,vertical conflict probability and its horizontal distribution are achieved.Examples of three intersected arrival and departure route design schemes are studied.Compared with scheme 1,the conflict frequency values of the other two improved schemes decrease to53% and 24%,respectively.The results show that the model can quantify potential conflict frequency of intersected routes. 展开更多
关键词 air traffic management terminal airspace design horizontal conflict frequency vertical conflict proba-bility kernel density estimation(KDE)
下载PDF
Designing Oxide Catalysts for Oxygen Electrocatalysis: Insights from Mechanism to Application 被引量:4
7
作者 Ning Han Wei Zhang +7 位作者 Wei Guo Hui Pan Bo Jiang Lingbao Xing Hao Tian Guoxiu Wang Xuan Zhang Jan Fransaer 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第10期514-546,共33页
The electrochemical oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) are fundamental processes in a range of energy conversion devices such as fuel cells and metal–air batteries. ORR and OER both hav... The electrochemical oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) are fundamental processes in a range of energy conversion devices such as fuel cells and metal–air batteries. ORR and OER both have significant activation barriers, which severely limit the overall performance of energy conversion devices that utilize ORR/OER. Meanwhile, ORR is another very important electrochemical reaction involving oxygen that has been widely investigated. ORR occurs in aqueous solutions via two pathways: the direct 4-electron reduction or 2-electron reduction pathways from O_(2) to water(H_2O) or from O_(2) to hydrogen peroxide(H_2O_(2)). Noble metal electrocatalysts are often used to catalyze OER and ORR, despite the fact that noble metal electrocatalysts have certain intrinsic limitations, such as low storage. Thus, it is urgent to develop more active and stable low-cost electrocatalysts, especially for severe environments(e.g., acidic media). Theoretically, an ideal oxygen electrocatalyst should provide adequate binding to oxygen species. Transition metals not belonging to the platinum group metal-based oxides are a low-cost substance that could give a d orbital for oxygen species binding. As a result, transition metal oxides are regarded as a substitute for typical precious metal oxygen electrocatalysts. However, the development of oxide catalysts for oxygen reduction and oxygen evolution reactions still faces significant challenges, e.g., catalytic activity, stability, cost, and reaction mechanism. We discuss the fundamental principles underlying the design of oxide catalysts, including the influence of crystal structure, and electronic structure on their performance. We also discuss the challenges associated with developing oxide catalysts and the potential strategies to overcome these challenges. 展开更多
关键词 Oxygen evolution Oxygen reduction Oxide catalysts Catalyst design Fuel cell Metal–air batteries
下载PDF
CFD-based design and analysis of air-bearing-supported paint spray spindle 被引量:1
8
作者 Ali Khaghani Kai Cheng 《Nanotechnology and Precision Engineering》 EI CAS CSCD 2018年第4期226-235,共10页
In this paper, an analytical scientific approach is presented for the design and analysis of an air-turbine-driven paint spray spindle, and it is used to improve further the design concept of the existing spindle appl... In this paper, an analytical scientific approach is presented for the design and analysis of an air-turbine-driven paint spray spindle, and it is used to improve further the design concept of the existing spindle applied in automotive coating and paint spraying applications. The current spindle on the market can operate at a maximum speed of 100,000 rpm and features a maximum bell size of 70 mm diameter. Given the increasing demands for high automotive coating/painting quality and productivity in assembly, the design and development of a paint spray spindle with a speed of 145,000 rpm or higher is needed. Computational fluid dynamics(CFD)-based simulation is applied in the approach. Accordingly, CFD simulation-based design and analysis are undertaken, covering the characteristic factors of velocity, pressure of the air supply, rotational speed of the air-turbine, and torque and force reaction on the turbine blades. Furthermore, the turbine blade geometric shape is investigated through the simulations. Three geometrical concepts have been investigated against the original model. The results on Concept_03 verified the higher angular velocity speeds against the theoretical model. The pressure and velocity effects in the blades have been investigated. The results show that the pressure and velocity of the air supply driving the turbine are critical factors influencing the stability of turbine spinning. The results also demonstrate that the force acting on the blades is at the highest level when the adjacent face changes from a straight surface into a curve. Finally, changing the geometrical shape in the turbine likely increases the tangential air pressure at the blades surface and relatively increases the magnitude of the lateral torque and force in the spindle. Notwithstanding this condition, the analytical values surpass the theoretical target values. 展开更多
关键词 air-bearing CFD analysis PAINT SPRAY SPINDLE air-turbine design TURBINE blade design and optimization
下载PDF
Design and Numerical Simulation on Coupled Flow Field of Radial Turbine with Air-Inlet Volute 被引量:2
9
作者 王云飞 陈焕龙 陈浮 《Transactions of Tianjin University》 EI CAS 2015年第2期153-160,共8页
As one of the core components of turbocharger or micro-turbine, radial turbine has the features of small size and high rotation speed. In order to explore the design method and flow mechanism of the turbine with a vol... As one of the core components of turbocharger or micro-turbine, radial turbine has the features of small size and high rotation speed. In order to explore the design method and flow mechanism of the turbine with a volute, a centimeter-scale radial turbine with a vaneless air-inlet volute was designed and simulated numerically to investigate the characteristics of the coupled flow field. The results show that the wheel efficiency of single passage computation without the volute is 80.1%. After accounting for the factors of the loss caused by the volute and the interaction between each passage, the performance is more accurate according to the whole flow passage computation with the volute. High load region gathers at the mid-span and the efficiency declines to 76.6%. The performance of the volute whose structure angle of the trapezoid section is equal to 70 degree is better. Unlike uniform inlet condition in single passage, more appropriate inlet flow for the impeller is provided by the rectification effect of the volute in full passage calculation. Flow parameters are distributed more evenly along the blade span and are generally consistent between each passage at the outlet of the turbine. 展开更多
关键词 radial turbine aerodynamic design WHOLE flow PASSAGE air-inlet VOLUTE
下载PDF
Characteristics and experience in the electrical design of the first domestically-integrated large-scale air separation unit
10
作者 GONG Zhaoliang 《Baosteel Technical Research》 CAS 2009年第3期18-22,共5页
The first domestically-integrated large-scale air separation unit (ASU) with a capacity of 60 000 m^3/h was successfully built and put into operation at Baosteel. Compared with the electrical design of the imported ... The first domestically-integrated large-scale air separation unit (ASU) with a capacity of 60 000 m^3/h was successfully built and put into operation at Baosteel. Compared with the electrical design of the imported equipment of the same type,this ASU has an electrical protection interlink that is independent from the distribution control system (DCS). With the design idea of simplicity, the ASU features a simplified configuration and an audio alarm system for electrical failures. It helps reduce the failure rate of the electrical equipment and detect failures quickly and accurately. It will effectively enhance safe and stabilized production. The ASU can not only reduce the cost of investment, but also ensure a smooth and stable running of the whole electrical equipment. This study focuses on the experience and understanding of the unit design and commissioning. 展开更多
关键词 air separation unit LOCALIZATION electrical design characteristics
下载PDF
Performance Analysis of Constant-Pressure Pumped Hydro Combined with Compressed Air Energy Storage System Considering Off-Design Model of Compressor 被引量:3
11
作者 Xin He Huanran Wang +1 位作者 Feiyue Tao Gangqiang Ge 《Energy and Power Engineering》 2021年第4期11-18,共8页
<div style="text-align:justify;"> With the wide application of renewable energy, energy storage technology has become a research hotspot. In order to overcome the shortcomings of energy loss caused by ... <div style="text-align:justify;"> With the wide application of renewable energy, energy storage technology has become a research hotspot. In order to overcome the shortcomings of energy loss caused by compression heating in compressed air energy storage technology, a novel constant-pressure pumped hydro combined with compressed air energy storage system was proposed. To deepen the understanding of the system and make the analysis closer to reality, this paper adopted an off-design model of the compressor to calculate and analyze the effect of key parameters on system thermodynamics performance. In addition, the results of this paper were compared with previous research results, and it was found that the current efficiency considering the off-design model of compressor was generally 2% - 5% higher than the previous efficiency. With increased preset pressure or with decreased terminal pressure, both the previous efficiency and current efficiency of the system increased. The exergy destruction coefficient of the throttle valve reached 4%. System efficiency was more sensitive to changes in water pump efficiency and hydroturbine efficiency. </div> 展开更多
关键词 Energy Storage Compressed air Energy Storage Off-design Model
下载PDF
Visual Interactive Computer Package for Air Conditioning System Design: Case of the International Conference Centre, University of Ibadan, Nigeria
12
作者 K. M. Odunfa T. O. Arowona V. O. Odunfa 《Journal of Building Construction and Planning Research》 2018年第4期317-330,共14页
Air conditioning design has become an interesting aspect of human life with the aim of seeking environmental comfort for indoor spaces. Analytical work involves in the design of air-conditioning system is often time c... Air conditioning design has become an interesting aspect of human life with the aim of seeking environmental comfort for indoor spaces. Analytical work involves in the design of air-conditioning system is often time consuming and laborious. This work therefore aims at developing a visual interactive computer package for the design of air conditioning system using the international conference centre, University of Ibadan, Nigeria as a case study. Procedures for calculating heat gain through various building components were discussed in detail. Cooling load analysis was carried out using standard cooling load equations obtained from the American Society of Heating, Refrigeration and Air conditioning Engineers (ASHRAE) handbook. A computer program was developed using java programming language to compute the total cooling load in the building. The result from the computer program was obtained within a very short period of time when compared with that of the manual one. The cooling load of the building obtained was 3,194,414 btu/hr;a visual interactive computer package for the design of air conditioning system has been developed and tested positively;hence can be used to design air conditioning system for any building. 展开更多
关键词 Environmental COMFORT PROGRAMMING Language air CONDITIONING design
下载PDF
Selection of Weather Parameters for Air-Conditioning System Design for Buildings with Long Thermal Lag 被引量:1
13
作者 GE Lian-feng1,2,LEI Ming3,CHEN You-ming1,2(1.College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China 2.Key Laboratory of Building Safety and Energy Efficiency,MOE,China (3.Aviation Theory Department,Aviation University of Air Force,Changchun,Jilin 130022,China) 《湖南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2009年第S1期79-82,共4页
Two building factors-a longer thermal lag of more than one hour for building envelops and a lag of indoor radiation to convert into cooling load-have impact on the instantaneous heat input and instantaneous cooling lo... Two building factors-a longer thermal lag of more than one hour for building envelops and a lag of indoor radiation to convert into cooling load-have impact on the instantaneous heat input and instantaneous cooling load.So the two factors should be taken into account when selecting the weather parameters for air-conditioning system design.This paper developed a new statistic method for the rational selection of coincident solar irradiance,dry-bulb and wet-bulb temperatures.The method was applied to historic weather records of 25 years in Hong Kong to generate coincident design weather data.And the results show that traditional design solar irradiance,dry-bulb and wet-bulb temperatures may be significantly overestimated in many conditions,and the design weather data for the three different constructions is not kept constant. 展开更多
关键词 building construction THERMAL LAG system capacity design WEATHER data air-CONDITIONING
下载PDF
Design and Modeling of Femto Air Bearing Slider
14
作者 Ching F. Yong Eddie Y. K. Ng +1 位作者 Wei D. Zhou Wan K. Ng 《Engineering(科研)》 2010年第11期841-854,共14页
This paper presents the studies of the performance of an improved femto air bearing slider which is optimized based on the past studies and effort. The flying characteristics performance of this novel femto slider is ... This paper presents the studies of the performance of an improved femto air bearing slider which is optimized based on the past studies and effort. The flying characteristics performance of this novel femto slider is relatively stable over different radii. This optimized slider achieved a flying height of 3 nm, with variation of about 0.2 nm. The variations for pitch and roll values are 6 μrad and 0.9 μrad respectively. In the studies for the effect of side rail on flying characteristics, it was found that there exists transition of pitch value when the side rail is located very close to the leading edge. The modulation of flying height reduces greatly when the areas of double shallow steps increase. The roll variation reduces when the flat double shallow steps profile is modified into a “V-Shape” profile. 展开更多
关键词 FEMTO air BEARING Performance SLIDER design Modeling Simulation Optimization
下载PDF
Optimization and Process Design Tools for Estimation of Weekly Exposure to Air Pollution Integrating Travel Patterns during Pregnancy
15
作者 Valentin Simoncic Mario Pozzar +2 位作者 Christophe Enaux Severine Deguen Wahida Kihal-Talantikite 《Open Journal of Statistics》 2022年第3期408-432,共25页
A growing number of international studies have highlighted that ambient air pollution exposures are related to different health outcomes. To do so, researchers need to estimate exposure levels to air pollution through... A growing number of international studies have highlighted that ambient air pollution exposures are related to different health outcomes. To do so, researchers need to estimate exposure levels to air pollution throughout everyday life. In the literature, the most commonly used estimate is based on home address only or taking into account, in addition, the work address. However, several studies have shown the importance of daily mobility in the estimate of exposure to air pollutants. In this context, we developed an R procedure that estimates individual exposures combining home addresses, several important places, and itineraries of the principal mobility during a week. It supplies researchers a useful tool to calculate individual daily exposition to air pollutants weighting by the time spent at each of the most frequented locations (work, shopping, residential address, etc.) and while commuting. This task requires the efficient calculation of travel time matrices or the examination of multimodal transport routes. This procedure is freely available from the Equit’Area project website: (https://www.equitarea.org). This procedure is structured in three parts: the first part is to create a network, the second allows to estimate main itineraries of the daily mobility and the last one tries to reconstitute the level of air pollution exposure. One main advantage of the tool is that the procedure can be used with different spatial scales and for any air pollutant. 展开更多
关键词 Travel Pattern Road Network air Pollution Exposure Optimization Tool Process design
下载PDF
Design and Analysis of Computer Experiments Based on a Simulation Model of Air Traffic Flow Optimization in Panama
16
作者 Juan Marcos Castillo Erick Jones +1 位作者 Victoria Chen Zoila Guerra de Castillo 《Journal of Traffic and Transportation Engineering》 2018年第5期205-222,共18页
There is a growing in number of operations in aviation all over the world.This growing is increasing the necessity of innovation and new technology to respond the increment of the demand.As a respond of this demand,FA... There is a growing in number of operations in aviation all over the world.This growing is increasing the necessity of innovation and new technology to respond the increment of the demand.As a respond of this demand,FAA(Federal Aviation Administration)is working with NextGen in the United States and the EUROCONTROL is implementing the Point Merge as solution in the air traffic flow management in Europe.However,the FAA alternative and EUROCONTROL alternative are not mutually exclusive since Panama,a small country in Latin America,is trying to use a combination between the vectoring approach and the Point Merge in the air traffic flow management.In addition,the AAC(Autoridad de Aereonautica Civil)and the Tocumen(Tocumen International Airport)are working in a continuous collaboration between FAA and Panama with the mutual challenge to improve the actual system.As a result,the main airline of Panama,the Compania Panamena de Aviacion(COPA Airlines),and the Autoridad de Aeronautica Civil(AAC)constructed a simulation model to select an air traffic flow alternative that can be able to change the actual situation.In other words,COPA Airlines and AAC are pursuing the minimization of the numbers of conflicts,the number of sequence actions,the flight time,the track flight distance and the fuel burn.Furthermore,this study aims to use the final draft of this previous analysis based on a simulation methodology to conduct a Design and Analysis of Computer Experiments with the final objective to increment the statistical significance of the actual model. 展开更多
关键词 air TRAFFIC management air TRAFFIC KPIs air TRAFFIC RULES ground TRAFFIC RULES SEASON ITINERARY DACE(design and Analysis of Computer Experiments) statistically significance
下载PDF
Coupling outdoor air quality with thermal comfort in the presence of street trees:a pilot investigation in Shenyang,Northeast China
17
作者 Chunping Miao Pingping Li +3 位作者 Yanqing Huang Yuxuan Sun Wei Chen Shuai Yu 《Journal of Forestry Research》 SCIE CAS CSCD 2023年第3期831-839,共9页
Together,the heat island eff ect and air pollution pose a threat to human health and well-being in urban settings.Nature-based solutions such as planting trees are a mitigation strategy to improve outdoor temperatures... Together,the heat island eff ect and air pollution pose a threat to human health and well-being in urban settings.Nature-based solutions such as planting trees are a mitigation strategy to improve outdoor temperatures(thermal comfort)and enhance air quality in urban areas.In this study,outdoor thermal comfort,and particulate matter levels were compared between treeless and treed areas to provide a better understanding of how street trees improve thermal comfort and air quality.Street trees decreased the physiological equivalent temperature from 46.3 to 44.2℃in summer but increased it from 36.4 to 37.5℃in autumn.Air temperature and relative humidity contributed more in summer while wind speed contributed more in autumn.Particulate matter concentrations were negatively correlated with physiological equivalent temperature in summer but not in autumn.The presence of trees decreased concentrations of fi ne particulate matter in hot summer conditions but increased in hot autumn conditions.The presence of trees increased coarse particulate matter in very hot summer conditions in summer and in hot autumn conditions.Overall,the layout of trees in urban street canyons should consider the trade-off between outdoor thermal comfort and air quality improvement. 展开更多
关键词 air pollution Particulate matter(PM) Physiological equivalent temperature(PET) Built environment Urban design
下载PDF
Design and Characterization of an Aerosol Test Chamber for Emergency Response Patient Contamination Control Simulation and Research
18
作者 Megan L. Steele Emily M. Spatz +4 位作者 George P. Lemmer Jacob M. Denney Jeremy M. Slagley Casey W. Cooper Robert M. Eninger 《Occupational Diseases and Environmental Medicine》 2023年第1期78-96,共19页
Contaminated or infected patients present a risk of cross-contamination for emergency responders, attending medical personnel and medical facilities as they enter a treatment facility. The controlled conditions of an ... Contaminated or infected patients present a risk of cross-contamination for emergency responders, attending medical personnel and medical facilities as they enter a treatment facility. The controlled conditions of an aerosol test chamber are required to examine factors of contamination, decontamination, and cross-contamination. This study presents the design, construction, and a method for characterizing an aerosol test chamber for a full-sized manikin on a standard North Atlantic Treaty Organization litter. The methodology combined air velocity measurements, aerosol particle counts and size distributions, and computational fluid dynamics modeling to describe the chamber’s performance in three dimensions. This detailed characterization facilitates future experimental design by predicting chamber performance for a variety of patient-focused research. 展开更多
关键词 Test Chamber Characterization Aerosol Generation Exposure Chamber design air Velocity Mapping Spatial Variability CFD Modeling Patient Decontamination
下载PDF
Calculation and Design of Dry-type Air-core Reactor
19
作者 Yan Li Zhenhai Zhang +2 位作者 Longnv Li Guoli Li Manhua Jiang 《Energy and Power Engineering》 2013年第4期1101-1104,共4页
Based on the method of compound and additional conditions under the conditions of the equal temperature rise and the equal potential drop (P.D.) of resistance, the application of design software of dry-type air-core r... Based on the method of compound and additional conditions under the conditions of the equal temperature rise and the equal potential drop (P.D.) of resistance, the application of design software of dry-type air-core reactor is introduced in this thesis. The analytical methods of the inductance are also given. This approach is proved entirely feasible in theory through the simplification with Bartky transformation, and is able to quickly and accurately calculate reactor inductance. This paper presents the analytical methods of the loss of dry-type air-core reactor as well. 展开更多
关键词 Dry-type air-core REACTOR Bartky TRANSFORMATION COMPOUND and Additional Conditions Software design
下载PDF
芳纶针织面料透气透湿及隔热性能研究 被引量:1
20
作者 郑勇 马云龙 +1 位作者 徐美琪 齐业雄 《针织工业》 北大核心 2024年第1期31-34,共4页
通过棉、蚕丝混纺纱,竹炭纤维、丙纶混纺纱和芳纶纱的科学搭配,由龙星制版系统进行双面针织物结构数字化设计,利用艺术设计方法有效地在结构和空间中进行科学合理的分配和排列,制备了纬编间隔织物和罗纹空气层织物,探讨了芳纶协同高舒... 通过棉、蚕丝混纺纱,竹炭纤维、丙纶混纺纱和芳纶纱的科学搭配,由龙星制版系统进行双面针织物结构数字化设计,利用艺术设计方法有效地在结构和空间中进行科学合理的分配和排列,制备了纬编间隔织物和罗纹空气层织物,探讨了芳纶协同高舒适性双面针织物的透气透湿、隔热等性能。结果表明:通过有效的数字化方法所设计的空气层组织中,芳纶与竹炭、丙纶混纺纱搭配织造的空气层织物透气性更好,纬编间隔组织中,芳纶与竹炭、丙纶混纺纱间隔织物比芳纶与蚕丝、棉混纺纱间隔织物的透气性好。蚕丝的透湿性比竹炭纤维更好,更适用于制作服装纤维材料。 展开更多
关键词 针织物 间隔组织 数字化设计 罗纹空气层组织 透气透湿 热传导系数
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部