搜索结果: 16-30 共查到“工学 conductivity”相关记录57条 . 查询时间(0.109 秒)
The influence of conductivity measurement on mechanical properties of potato tubers – Short communication
potato conductivity deformation curve voltage frequency deformation
2014/2/26
Deformation curves in uniaxial compression of raw potato tuber were analyzed at Nicola and Saturna varieties. In the first part of deformation (time 1 min), some part of specimens were loaded by elect...
Achieving combined high strength and high conductivity in re-processed Cu-Cr alloy
Metallic alloys Cu-alloys Mechanical Properties
2009/12/14
Purpose: Precipitation hardening by nano-sized precipitates had proven to be the most adequate way to achieve the optimum combination for strength and conductivity in copper based alloys. However, pre...
Experimental investigation of viscosity and thermal conductivity of suspensions containing nanosized ceramic particles
I. Tavman A. Turgut M. Chirtoc H.P. Schuchmann S. Tavman
2009/12/2
Purpose: In this study we report measurements of effective thermal conductivity by using 3ω method
and effective viscosity by vibro-viscometer for SiO2-water and Al2O3-water nanofluids at different p...
Structure and AC conductivity of polycrystalline Pb(Cd1/3Nb2/3)O3
Ferroelectrics Phase transition Polarization
2009/12/2
Purpose: Purpose of this work was to determine crystalline structure and ac electric conductivity of polycrystalline
sample Pb(Cd1/3Nb2/3)O3 (PCN) in paraelectric phase. Controversies involving uncer...
Effect of polydispersity in conductivity of unidirectional cylinders
Effective conductivity Fibre composite Polydispersity
2009/12/2
Purpose: Purpose of this paper is to study the effective thermal conductivity of infinite unidirectional circular
cylinders arbitrary distributed in a uniform host.
Design/methodology/approach: Appl...
Simulation on the Conductivity of Charging Stock with Percolation Structure in the Submerged Arc Furnace
submerged arc furnace
2009/11/13
Based on the fractal geometry, a new way for selecting material burden ratio and size distribution, named physical design of burden, which is different from stoichiometric weight of carbon burden, wou...
番茄果实热导率测试装置参数实验（Optimization of the Parameters of Designed Apparatus for Determination of Thermal Conductivity of Tomato Fruits）
番茄 热导率 测试装置 操作参数
2009/11/3
微热探针法测试热导率系统已被广泛应用于食品材料热导率的测试中。但是，由于实验条件或实验设备的限制，基于理想的线热源瞬态模型测量原理得到的结果会产生某些测试误差。针对测试误差，从探针输入电压、加热时间和样品的径向尺寸等装置操作参数的选择着手，通过实验，得到装置系统测定中输入电压的最佳值为2.5～6.5V、加热时间最佳值为20～50s。最后通过实际测试，得到了番茄果实在不同成熟阶段的热导率变化规律。
Effect of the microstructure of EB-PVD thermal barrier coatings on the thermal conductivity and the methods to reduce the thermal conductivity
Thermal barrier coatings (TBCs) Electron beam-physical vapour deposition (EB-PVD) Thermal conductivity Zirconia
2010/8/16
Thermal Barrier Coatings (TBCs) were first successfully tested in the turbine section of a research gas turbine engine in the mid-1970s. By the early 1980s they had entered revenue service on the vane...
DETERMINATION OF THERMAL CONDUCTIVITY IN FOUNDRY MOULD MIXTURES
thermal conductivity granularity of sand foundry sand
2009/10/23
For a thorough understanding of the behaviour of foundry mould mixtures, a good knowledge of thermal properties
of mould materials is needed. Laboratory determination of thermal conductivity of mould...
DETERMINATION OF THERMAL CONDUCTIVITY OF ROCKS SAMPLES USING FABRICATED EQUIPMENT
thermal conductivity thermal diffusivity specific heat
2009/10/14
The aim of the paper is to describe how inexpensive/simple physics equipment was fabricated and used in the determination of thermal conductivity of rock samples. We used the experimental techniques k...
测试土壤含水率和电导率的时域反射仪系统（Design of Time Domain Reflectometry for Application of Soil Moisture and Bulk Electrical Conductivity Measurements）
土壤 含水率 电导率 相对介电常数
2009/8/11
研究了用于土壤参数测试的时域反射仪（TDR）系统原理与电路实现方法。根据系统设计要求设计出时域反射仪样机，该样机脉冲发生电路产生140ps上升沿的时域脉冲，接收电路等效采样精度为8.69ps，并设计了时域反射仪系统控制程序，给出了程序的系统控制和数据处理流程图。利用研制的TDR样机对两种土壤样本的相对介电常数进行了测试，反演了土壤样品的体积含水率，同时利用采集波形反演计算出不同湿度土壤样品的体积含...
农田土壤pH值和电导率采集仪设计与试验（Design and Experiment on the Field Information pH Value and Electrical Conductivity Acquisition Instrument）
土壤 pH值 电导率 采集仪
2009/8/11
设计开发了测量pH值和电导率的农田信息采集仪。在探讨该仪器测量原理和软硬件设计的基础上，分别采用两点校正法和配比KCl溶液法对采集仪的pH值和电导率测量进行了标定试验，并在一块黄豆田间隔14m×14m进行土壤采样，共采土样15个，对标定方程进行了验证试验。结果表明，土壤pH值标定结果和准确值的相对误差小于1%，土壤电导率相对误差小于14%；土壤pH值标定结果和准确值线性回归模型检验显著性概率为0....
Imaging Tissue Conductivity via Contactless Measurements: A Feasibility Study
Imaging Tissue Conductivity Contactless Measurements Feasibility Study
2009/7/27
The feasibility of a new imaging system is investigated. This system will be used to image electrical conductivity distribution of biological tissues via contactless measurements. This will be achieve...
Neural Network for Predicting Thermal Conductivity of Knit Materials
Neural Network Predicting Thermal Conductivity Knit Materials
2009/7/21
The major aim of comfort research is to find the comfort temperature for an individual or group. This subjective property can be evaluated by means of thermal conductivity as a physical characteristic...
Determination of Radiative Thermal Conductivity in Needlepunched Nonwovens
Radiative Thermal Conductivity Needlepunched Nonwovens
2009/7/21
Radiation heat transfer is found to be the dominant mode of heat transfer at temperatures higher than 400-500K [11]. Convection heat transfer being negligible in nonwovens, effective thermal conductiv...