查询词典 B.P.

Finally, A B-P neural network is used to optimize the catalytic reaction conditions.

最后采用B-P神经网络对该反应体系的反应条件进行了优化。

In 1909, B-P organized an event at London's Crystal Palace for Scouts everywhere.

1909年， B-P 在伦敦的水晶宫为各地的童子军组织了一次活动。

In addition, when the modified PVA resins fulfilled requirements in the following: 1 the acetalization degree varied from 60 mol% to 80 mol%, 2 the esterification degree varied from 10 mol% to 20 mol%, 3 the amount of hydroxyl group was 5-25 mol%, 4 the range of value of B/P(the mass ratio of the binder to diazo resin) was from 4 to 4.5,5 the range of its molecular weight was from 4×10^5 to 8×10^5, the negative PS plate obtained had excellent sensitivity, hydrophobic property, good developability, good ink receptivity and good scratch resistance.

因此其分子量、酯化度和缩醛度的确定，必须综合考虑各项性能之间的平衡。缩醛度为60-80 mol%，酯化度10-15mol%，羟基5-25 mol%，分子量约为4-8万，B/P为4-4.5时，制得的阴图PS版的感度、显影性、着墨性和耐磨性都较好。

And 2 700 a B.P., respectively, based on data in 3 profiles of high moor peat deposits.

和 2 70 0 a B.P。以来孢粉组合特征和植物群与气候演变过程。

About 1.7-1.6Ma. B. P, phase C of the Qinghai-xizang Movement made the yellow River cut down the"Gansu Peneplain"and drained off the water of Dong shah paleolake, so that the loess was preserved in the Lanzhou region.

在1.7-1.6Ma.B.P前后，青藏运动C带使黄河自临夏盆地的"甘肃期准平原面"下切，排干了东山古湖之水，从而使研究区内有了得以保存黄土堆积的条件。

ABSTRACT A new learning method with self-adaptive deviation and adjustable slope sigmoid function is presented in this paper. The theoretical formulation and its deduction based on B-P are also presented.

本文提出了自适应偏移和可调陡度的B-P神经网络学习算法，给出了这种新的神经网络学习方法的理论推导和计算公式。

Through studying, the deposit environment of low lying area was long period unrestful, potassium resources mainly store in liquid, and in 25ka B.P.

研究分析表明，罗北洼地为一长期动荡的浅水沉积环境；钾资源以液体矿为主：2 5 ka B.P。

The aim of this study was to develop a novel amphiphilic functional block poly(ε-caprolactone) bearing ketone groups MPEG-b-P(OPD-co-CL. 2-oxepane-1, 5-dione was copolymerized with ε-caprolatone in which methoxy poly (MPEG, Mn=5 000) and stannous octoate were used as initiator and catalyst, respectively. The syntheses were conducted by bulk and solution polymerization. 1H NMR results showed that peak position and splitting of the polymers synthesized through solution polymerization were consistent with theoretical data, demonstrating the products were designed block copolymers. While in the bulk polymerization, polymer peak position was changed due to their high reaction temperature, suggesting their structural variation.

将带有羰基官能团的4-羰基己内酯和ε-己内酯分别在甲氧基聚乙二醇(MPEG，Mn=5 000)为引发剂，异辛酸亚锡为催化剂溶液和本体体系中开环聚合，合成了两亲性侧基带有羰基官能团的聚己内酯嵌段共聚物MPEG-b-P(OPD-co-CL.1H NMR结果表明采用溶液聚合法合成的聚合物各峰的峰位置和分裂情况与理论一致，证明了产物是实验所设计的嵌段共聚物，而采用本体聚合法合成的聚合物由于温度的影响，聚合物各峰的峰位置发生了变化，说明其结构发生了变化；差示扫描量热法分析结果表明随着OPD单体含量的增加，聚合物的熔点，玻璃化转变温度和熔融焓增加；热失重测试结果表明OPD单体的引入增加了聚合物的热敏感性。

According to Tom Cummins, which one of the following is NOT true of B.P.A.?

根据汤姆·卡明斯所说的，关于B.P.A。下列哪个选项是不正确的？

Two days after two-chamber shared medium assay, the expression of PDGF-B(P���0.05) trkA and trkB of NSCs was up-regulated; and the expression ofNGF and BDNF Of OECs was increased.

共培养液培养2d后，神经干细胞PDGF-B(P＜0.05)、trkA和trkB mRNA的相对量上调，嗅鞘细胞NGF和BDNF mRNA的相对量有所增加。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。