查询词典 essential resistance

Rna - Rns, see "Partitioning of net radiation", for multiple plants the fraction of radiation to each plant is calculated in the radiation section, see "Partitioning of radiation between plants", es is the vapour pressure at saturation, ea is the actual vapour pressure,ρa is air density, cp is the specific heat of air at constant pressure, Lν is the latent heat of vaporisation,Δ is the slope of saturated vapour pressure versus temperature curve,γ is the psychrometer "constant", rs is an "effective" surface resistance and ra is the aerodynamic resistance.

潜在蒸腾量 Etp 根据Monteith(1965)给出的彭曼联合方程形式计算：式中： Rn 为对于蒸腾的有效净辐射量(也就是 Rna - Rns ，见"净辐射划分"-Partitioning of net radiation，对于多重植被，每一株植物的辐射比率的计算见辐射一节的"植物间的辐射划分"Partitioning of radiation between plants)； es 为饱和水气压；ea 为实际水气压；ρa 为空气密度； cp 为常压下的空气比热；Lν为汽化潜热；Δ为与温度曲线饱和水气压关系曲线斜率；γ为干湿球湿度计"常数"；rs 为"有效"表面阻力；ra 为气动阻力。

Significant selection effects of leaf blade pubescence status on resistance to bean pyralid were found in R1-R6 stages. It indicated that the pubescence status on leaf blade can be used as an indirect indicator for the resistance to bean pyralid in marker-assisted selection breeding.

在大豆生长的R1-R6期，两群体中叶片茸毛着生状态都有明显的选择效应，因而大豆叶片茸毛着生状态可作为豆卷叶螟抗性的指示性状，用于抗豆卷叶螟的标记辅助选择育种。

Using the strategy,the pure integration and stator leakage inductance are removed from the reference model.Then the low speed performance is improved.Simultaneously,As to the stator resistance identification,the accuracy of speed observation is increased and the rotor resistance can also be identified.

该方法消除了纯积分和电机漏感对算法的影响，电机的低速性能得到了改善；同时，对定子电阻进行在线辨识，从而得到准确的转速观测结果，也能近似地辨识转子电阻。

Some important traits, i.e., oil and protein contents, 100-seed weight, and the resistance of soybean to Bean pyralid in F2 population, the resistance of soybean to soybean mosaic virus with strain Sa in the F2:3 population, and the number of branches, the number of main-stem nodes and plant height in the F2 and F2:3 populations, were measured.

主要结果如下： 1。连锁图总长度为1091.34cM，标记间平均距离为16.53cM。利用公共遗传图谱，将21个连锁群与大豆染色体相对应。每个连锁群上的标记数目在2-8个之间，连锁群长度在17.71-129.33cM之间。相邻标记间平均间距最大的连锁群为D1b，为43.55cM；最小平均间距的连锁群为M，为13.86cM；有20个区间长度大于20cM。

Kdr resistance and determination of frequences of kdr gene in house fly field population L1014F is the most common amino acid substitution in the kdr allele. The frequency of the L1014F kdr allele was determined by the method of PASA in fourteen field populations of houseflies with resistance factors at LD〓 for pyrethrin/ piperonyl butoxide and bioresmethrin/piperonyl butoxide from 4 to 29 and 2 to 98, respectively.

击倒抗性及kdr基因频率在家蝇野生种群中的检测 L1014F是击倒抗性等位基因最常见的突变位点。14个家蝇种群对除虫菊酯／胡椒基丁醚和苄呋菊酯／胡椒基丁醚的LD〓抗性倍数分别为4到29和2至98。

On the other hand, 3(2)-fluoro-4-methoxyl methyl benzyl alcohol and 3(2)-fluoro-4-methyl benzyl alcohol are mixture and components of pyrethrum esters. Both of them have "mixture fluorine effect " and higher activity, lower drug resistance. As we know, the mixture benzyl alcohol containing fluorine is more easy to be synthesized than the single, so the cost of preparation is lower. We hope to apply it to molecule design of the new agriculture chemical. On the base of molecule design and structure-activity relationship research of pyrethric acid II and mixture of alcohol containing fluorine, we intend to get new pyrethrum ester that have higher activity and lower resistance.

另一方面，混合含氟对甲氧甲基苄醇和混合含氟对甲苄醇都是具有"混合氟效应"的高活性、低抗性的拟除虫菊酯醇组分，由于混合含氟醇的合成要比单一异构体的合成容易，成本较低，本文希望将其应用到新农药的分子设计中，用第二菊酸和一些含氟醇进行分子设计及进一步的构效关系的研究，筛选出一些高活性低抗性的拟除虫菊酯换代新品种。

The quick freeze test and other standard methods are adopted to validate the frost resistance, shrinkage, abrasion resistance and other pavement durability of concrete mixed with both materials.

采用快冻法等规定的试验方法验证了双掺混凝土的抗冻、收缩、抗磨耗等路用耐久性能。

The analysis of Wr+Vr showed that the additive effect was major and the susceptibility was partially dominant.The inheritance of resistance in the highly resistant accessions(Calhoun Gray、Sugerlee) to race1 conform to a single dominant gene conditioned the resistance and there was significant correlation between the genes controlling the characters.

试验结果表明：西瓜对枯萎病抗性是由隐性多基因控制，其遗传符合加性-显性模型，加性效应比显性效应更为重要，且感病对抗病表现为部分显性，显性方向指向增效，隐性基因为减效，在所有亲本中所携带的隐性基因比显性基因多。

This paper puts forward the derivation of precise calculating formula used to determine the magnification ratio of voltage, input resistance and output resistance in amplifying circuits based on the feedback circuit model with parallel voltage.

在建立电流并联反馈电路模型的基础上，推导出放大电路中的电压放大倍数、输入电阻、输出电阻的精确计算公式。

precise calculating formula is derivated to determine magnification ratio of voltage,input resistance and output resistance in amplifying circuits based on th feedback circuit model with cascade voltage.with th new calculating methods put forward by the author,it is possible to solve the problems in terms of calculation in amplifying circuits,the key problem being low level of exactness.the research shows the influence of components′ parameters of basic amplifying circuits and feedback circuits on feedback amplifying circuits.the results of the research may contribute to design amplifying circuits and electronic instrument with higher performance,due to the simpler calculation in the design of feedback circuit with cascade voltage.

摘 要：在建立电压串联反馈电路模型基础上，推导出放大电路中的电压放大倍数、输入电阻、输出电阻的精确计算公式。提出新的计算方法，从而解决了放大电路计算不方便，精确度不高、准确性不够的问题。同时进一步揭示了基本放大电路、反馈电路元件参数对反馈放大电路的影响关系。为设计出高性能放大电路及电子设备指明了方向，更加方便于电压串联反馈电路的计算。

However it can often be frust ating for a child when people are unable to pronounce their name.

但它往往可以令人沮丧的一个孩子当人们无法断言他们的名字。

All these compounds were obtained from this genus for the first time. Compound, 4-cumylphenol, was a new nature product.

所有化合物均为首次从本属海藻中分离得到，其中4cumylphenol为新天然产物。