查询词典 pitch ratio

In this paper, finite-time thermodynamics is applied to optimize the intercooling pressure ratio and the heat conductance distribution of hot- and cold-side heat exchangers, intercooler and regenerator of a real closed intercooled regenerated Brayton cycle. Double-maximum efficiency is obtained by further optimizing the total pressure ratio. The effects of some important parameters on the optimal results are analyzed by detailed numerical examples.

该文应用有限时间热力学方法研究了实际闭式燃气轮机循环热效率最大时高低温侧换热器、回热器和中冷器的热导率最佳分配和最佳中间压比分配；进一步对总压比优化可得到双重最大效率；分析了循环的一些重要参数对性能的影响。

Under the current (1996) conditions of planned irrigative and municipal water supply of Shihmen Reservoir, inflow discharge at the damsite, estimated flows at downstream control points and other associated data, the annual shortage ratio and shortage index through reservoir operation simulation are called the basic shortage ratio and shortage index. These two numbers are the criteria to evaluate the reliability of water supply from the Reservoir.

摘要探讨石门水库在现况(民国85年)灌溉及公共给水计画配水情况下，以石门坝址之流量纪录及其下游控制点之推估流量，配合水库相关资料，经由所建立之水库运转程式，模拟其年平均缺水率及缺水指数，此称之为基准缺水率及缺水指数，以作为水库供水可靠度之比较标准。

When the amount of SO(superscript 2- subscript 4)/ZrO2 catalyst was 7% of the mass of β-pinene, the yield of product was 62.0%, and the mass ratio of borneol to isoborneol in the product was 13.6:48.7. When the amount of S2O(superscript 2- subscript 8)/ZrO2 catalyst was 7% of the mass of β-pinene, the yield of product was 66.7%, the mass ratio of borneol to isoborneol in the product was 11.5:49.5. Both two catalysts were poor for borneol selectivity.

在上述反应条件下，当催化剂SO(上标 2-下标 4)/ZrO2用量为7%时（以β-蒎烯质量计，下同），粗龙脑产率为62.0%，产品中正、异龙脑比为13.6：48.7；当催化剂S2O(上标 2-下标 8)/ZrO2用量为7%时，粗龙脑产率为66.7%，正、异龙脑比为11.5：49.5；这两种催化剂对正龙脑选择性比较差。

It is found that UIFR with softening point of 90℃, OH value of 32mg KOH/g andM of 377 g/mol is synthesized when molar ratio of isobutyraldehyde to formaldehyde is 1.5, molar ratio of aldehyde to urea is 6, vacuum distillation temperature and time is 140℃ and 1 h respectively. The terpolycondensate is soluble in most solvents, of paints and exhibits excellent yellowing-resistance.

结果表明，在异丁醛、甲醛摩尔比为1.5，醛、脲摩尔比为6，真空蒸馏温度为140℃、时间为1h的条件下，合成出的UIFR软化点为90℃，羟基值为32mgKOH/g，M为377g/mol，且树脂具有良好的溶解性和杭黄变性。

Synthesis of biodiesel by transesterification of rapeseed oil and methanol catalyzed by KOH/Al2O3 solid base was studied. The catalyst was prepared by isochoric impregnation. Effects of some factors on the transesterification were investigated systematically and reaction conditions were optimized. The optimum reaction conditions on KOH/Al2O3 catalyst were: mass ratio of KOH to Al2O3 20%; calcination temperature 400℃ for 5h; molar ratio of methanol to oil 12:1, the amount of catalyst 5wt%; reaction temperature 60℃ and reaction time 2h.

采用等体积浸渍法制备了KOH/Al2O3负载型固体碱催化剂，并将其用于菜籽油与甲醇酯交换法合成生物柴油的研究；分别考察了催化剂附载量、锻烧温度、醇油摩尔比、反应温度、反应时间等条件对生物柴油产率的影响；结果表明：用等体积浸渍法，在400℃煅烧5h，制得负载量为20%的KOH/Al2O3催化剂。

The cell suppression ratio and surviving ratio were detected respectively under conditions of simple hypoxia, or 5mmol/L glucose complicated with hypoxia. The mRNA levels of key enzymes that are involved in regulating glyco-metabolism were detected, including the mRNA levels of pyruvate-kinase, hexokinase, succinic dehydrogenase and isocitric dehydrogenase, and the activity of lactate dehydrognase.

以SMMC-7721人肝癌细胞和L02正常肝细胞作为研究对象，分别在单纯缺氧及加葡萄糖缺氧条件下，观察细胞生长，并检测糖代谢关键酶：丙酮酸激酶(pyruvate-kinase， PK)、己糖激酶(hexokinase， HK)、琥珀酸脱氢酶(succinic dehydrogenase， SDH)、异柠檬酸脱氢酶(isocitric dehydrogenase， IDH) mRNA表达水平和乳酸脱氢酶(lactate dehydrogenase， LDH)活性。

Modern systems consist of one or more computer-controlled metering pumps that can be programmed to vary the ratio of mobile phase components, as is required for gradient chromatography, or to mix isocratic mobile phases (i.e., mobile phases having a fixed ratio of solvents).

现在的泵系统通常是一元或多元计算机控制的计量泵组成，它们可以通过编程来改变流动相的组成，以满足梯度色谱的要求或者用来混合等度流动相（也就是流动相的组分可以有一个固定的溶剂配比）。

Modern systems consist of one or more computer-controlled metering pumps that can be programmed to vary the ratio of mobile phase components, as is required for gradient chromatography, or to mix isocratic mobile phases (i.e., mobile phases having a fixed ratio of solvents).

现代的系统由一个或更多个计算机控制的计量泵组成。这些泵能够按程序变化流动相的组成比例，以满足梯度色谱的要求或者用来混合等度流动相（即流动相有一个固定的溶剂配比）。

Modern systems consist of one or more computer-controlled metering pumps that can be programmed to vary the ratio of mobile phase components, as is required for gradient chromatography, or to mix isocratic mobile phases (i.e., mobile phases having a fixed ratio of solvents).

泵系统—HPLC 泵系统通过高压管路和设备将储液系统的流动相按设定的流量精确地输送通过柱子，最新的泵系统由一台或更多的计算机测量控制泵使得流动相组分能够按照程序变化改变比例，如有必要，可以进行梯度洗脱或混合均匀的流动相（i.e。，流动相可以是混合比例的溶液），然而，当操作压力达到或高于5000 psi，流速达到10ml/min的典型值时，预混合均匀的流动相各成分的比例就比泵控制的更精确。

Modern systems consist of one or more computer-controlled metering pumps that can be programmed to vary the ratio of mobile phase components, as is required for gradient chromatography, or to mix isocratic mobile phases (i.e., mobile phases having a fixed ratio of solvents).

后者有一个装样品瓶的转盘或者架子，瓶子顶部用可以穿孔的隔膜或者塞子密封，和一个注射装置来把样品从样品瓶转移到定量环，从那里注入到色谱分离系统。

Consumer preference ; fuzzy partial ordering relation ; condorect function

消费者偏好；模糊偏序关系； condorect函数

And she doesn't have a cat, she has a Mexican hairless.

而且她不养猫，她养了一只墨西哥无毛犬。