查询词典 isothermal surface

A sufficient and necessary condition of an isothermal surface being a minimal surface is obtained.

除平面外没有其它二次多项式极小曲面，Enneper曲面是目前微分几何文献中唯一出现的三次参数多项式极小曲面，还没有出现高次多项式极小曲面的例子。

The relative variation of the slope of curve pairs of isothermal surface potential decay is first time used to study trap energy density creation.

这一理论结果填补了长期以来介质电老化只有经验公式而没有理论基础的空白。

Combining with a practical example, by computer simulation the diagrams of isothermal surface of the energy-stored aquifers during heating period and cooling period are obtained, so the distance between extracting well and injecting well is determined.

结合工程实例，通过计算机模拟，得出了供暖期和制冷期的等温面图，从而确定了采灌井的间距。

Its physical model is put forth:"Out of an element of the isothermal surface of non-penetrate material covered airtightly by a perfect reflector, the emission is the one of blackbody at the temperature of the isothermal surface."

第二类黑体辐射源概念和物理模型的提出是在他人早期实践及初步模型的基础上抽象而成。

Most of the current finite element software packages treat it using the net-radiation method or absorbed radiation method based on the assumption of isothermal surface with uniform radiation heat flux,which brings the conflict between the precision and the quantity of grids.

进行了选用高阶单元、采用高斯积分精确计算单元表面变辐射热流方法的研究，从而摆脱了一致表面温度和辐射热流的假设，使得在相同网格密度的情况下计算精度大大提高；同时，从包含辐射换热问题的有限元计算方程出发，采用与有限元数值计算时相同的积分方案，只在独立的积分点处计算辐射热流，克服了积分方法计算效率低的缺点。

By controlling the process of sol gel, the charge storage stability of porous silica thin film electret based on silicon substrate were investigated by measurements of IR spectra, isothermal surface potential decay and current spectra of open circuit Thermally Stimulated Discharge.

通过控制溶胶凝胶工艺条件，利用相应条件下样品的红外光谱，等温表面电位衰减，开路热刺激放电电流谱等，考察了Si基多孔SiO2 薄膜驻极体体内沉积的空间电荷的储存稳定性，分析了各种工艺参数与薄膜驻极体性质之间的联系。

Methods: Polytetrafluoroethylene and polypropylene film electrets were prepared by constant voltage corona charging at room temperatures. The charge-store stability of PTFE and PP were studied by measuring isothermal surface potential decay after different dose of ultraviolet radiation.

用常温恒压电晕充电系统将聚四氟乙烯和聚丙烯两种材料极化制备成驻极体；用补偿法测量不同剂量的紫外照射后驻极体的表面电势。

The polarization stability of the samples poled by constant voltage corona charging was investigated by means of measuring the open-circuit thermally stimulated discharge current-temperature spectrum, the electro-optical coefficient and the isothermal surface potential decay.

样品用恒压电晕充电法极化，通过测量电光效应的等温衰减监测偶极子有序取向稳定性，用开路热刺激放电、等温表面电位衰减测量等手段分析了材料的电荷动态特性。

Methods: The PP/porous PTFE/PP composite electret film was prepared with porous PTFE,polyethylene and PP by heat melting technique.The charge storage stability of the electret film and transportation were evaluated by using the methods of isothermal surface potential attenuation and open-circuit thermally stimulated discharge current spectra.

利用热融法将多孔PTFE、聚乙烯和PP制备成PP/多孔PTFE/PP复合膜驻极体，利用等效表面电位衰减和开路热刺激放电电流谱方法研究PP/多孔PTFE/PP驻极体的电荷储存稳定性及其输运规律。

The differential exhumation caused by the NNE-trending faults probably continued all the way from the 180℃isothermal surface, through 110℃isothermal surface to the 70℃isothermal surface. At 90Ma, Dabie orogen"s average height of topography, compared with the current sea level, reached 1.45 km (when geothermal gradient is chosen as 25℃/km) or 1.75 km (when geothermal gradient is chosen as 20℃/km), which is 4(when geothermal gradient is chosen as 25℃/km) or 5(when geothermal gradient is chosen as 20℃/km) times of the height of today"s surface topography in simulated region.

这种由于NNE向断裂系引发的差异推隆剥露，可能从等温面180℃锆石(U-Th／He的封闭温度、经过110℃(磷灰石裂变径迹的退火温度)一直延续到70℃等温面磷灰石(U-Th／He的封闭温度大别造山带90Ma时与现今海平面相比地形平均高度可达1.45km(地温梯度取25℃／km时)或1.75km(地温梯度取20℃／km时)，是现今模拟区域地形平均高度的4倍(地温梯度取25℃／km时)或5倍(地温梯度取20℃／km时)。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。