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This thesis analyzes the types and art trait of solar-assisted heat pump water heater, the development trend of direct expansion solar-assisted heat pump water heater, makes a summary of these research results from six aspects. On the basis of these works and from the point of view of receiving optimum solar radiation , the thesis develops a novel design model of direct expansion solar-assisted heat pump water heater with a truncated cone collector/evaporator, theoretically analyzes the heat that the system can absorb, compares its ability with other two types of cylinder and flat plate ones, and calculates COP and EER with computer aids. The results show that a truncated cone direct expansion solar-assisted heat pump water heater can absorb not only more solar energy but heat energy in air. It takes on favorable thermal performance. Under the average day in February which is of the worst weather throughout the year in Kunming, the COP is about 4. 2, EER is about 2.9 . The heat absorbed by the system are more than those of the other systems. The system is very great in terms of saving

本文分析研究了太阳能热泵热水系统的分类及技术特点，直膨式太阳能热泵技术国内外发展趋势，从六个方面对直膨式太阳能热泵热水系统的研究进行了归纳总结；在此基础之上，从太阳辐射的最佳接收考虑，提出了集热器／蒸发器为圆台侧面的圆台型直膨式太阳能热泵热水器的设计模型，理论上分析了这种热水系统所接收的太阳辐射和得热量，并与圆柱型、平板型的直膨式太阳能热泵热水系统进行对比分析，通过计算机辅助模拟计算出：系统不但可以有效地吸收太阳能，还能有效地吸收空气中的热量，具有良好的热性能；在昆明，以2月为代表的冬季，其太阳辐照较低，系统的制热系数COP值也能达到4.2，效能比EER值为2.9；系统的得热量高出圆柱型、平板型的直膨式太阳能热泵热水系统，节能效果明显。

Because the normal distribution is not fit for the practical design,the truncated distribution has been presented to solve this problem,the reliability index under truncated distribution has also been calculated.

对工程中大量存在的截尾分布与计算中使用的理论分布不同问题作了详细的研究，计算了在变量服从截尾正态分布时的可靠性指标的计算，并给出了如何确定实际工程中的截尾点的方法。

In order to investigate the law of the unstability during the evolutionary process in genetic algorithms, two novel concepts of the truncated generation and the distribution of truncated generations are firstly presented, and their definitions are also detailed.

为了研究遗传算法进化过程中的非稳定性规律，文中首次提出了进化截止代数和进化截止代数分布两个新概念，并给出了它们的具体定义。

The average truncated generations" and "the distribution entropy of truncated generations are used to evaluate the optimization efficiency of CGA.

本文将"平均截止代数"和"截止代数分布熵"作为评价指标，对混沌遗传算法的优化效率进行了研究，定量地评价了CGA的优化效率，通过与遗传算法进行比较，进一步说明了CGA的优化效率高于GA。

The average truncated generations"and"the distribution entropy of truncated generationsare used to evaluate the optimization efficiency of NGA.

同时，由于以其所具有的本质并行性、随机性及自适应性等特征，使其被认为是求解非线性现象和复杂系统问题的重要方法之一。

A truncate leaf; truncated volcanic mountains; a truncated pyramid.

被削平了的树叶；平头的火山；平头的金字塔。

In order to avoid prolin residue inhibiting enterokinase cleavage, 9bp of MGF cDNA 5′ end sequence was truncated by primer, then the obtained truncated MGF des(1-3MGF cDNA (321 bp) was subcloned in pET32a vector to construct a prokaryotic recombination expression plasmid.

通过RT-PCR从拉伸刺激的人成骨细胞中克隆MGF cDNA序列，并去除5'端9 bp的序列，使N端缺少对肠激酶(Enterokinase， EK)具有抑制作用的脯氨酸，将截短型MGF des(1-3 MGF cDNA序列克隆入pET32a质粒，构建重组表达质粒。

After induced with IPTG, the proteins expressed by different fragments were analyzed by SDS-PAGE, and the results showed that all these truncated proteins could be expressed in E. coli BL21. Bioassay result against Plutella xylotella showed that the active fragment of Cry1Ba3 protein was located between amino acid No. 22 and No. 655. As the insecticidal activity of the truncated protein containing amino acid No. 54-655 was declined significantly, and No. 22-627 and No.

采用浸叶法检测这些蛋白片段对小菜蛾的杀虫活性，研究结果表明含有第1～685位和含有第22～655位氨基酸的蛋白片段对小菜蛾的毒性，与全长Cry1Ba3蛋白相比，没有改变；含有第54～655位氨基酸的蛋白片段对小菜蛾的毒力明显降低；而含有第22～627位和含有第85～655位氨基酸的蛋白片段完全丧失了对小菜蛾的活性。

Tobacco mosaic virus, a member of alphavirus-like superfamily, the N-terminal truncated TMV helicase formed hexamer and exhibited double strand RNA unwinding activity. Accordingly, we also constructed the same N-terminal truncated BaMV helicase-like domain and analysis the capability to unwind double-strand RNA.

在同属於alphavirus-like superfamily的Tobacco mosaic virus之解螺旋蛋白的分析中，其N端的截断蛋白会形成六聚体，而且具有解旋活性，因此我们同样建构了许多类解螺旋酵素N端的截断蛋白，测试其蛋白质的聚集形式及解旋活性。

The truncated icosahedra have been prepared for the first time by prolonging the reaction time to 4 h.The XRD,SEM,TEM and Uv-vis technologies confirm the high shape difference between icosahedral gold nanocrystals and their truncated forms.

通过延长反应时间合成了一种类似足球的新型金纳米粒子—截角二十面体，研究结果表明，该粒子由二十个六边形和十二个五边形组成，截角面是{100}面。

There are two types of gold deposits in this area, namely altered rock type and quartz vein type.

本区金矿床包括两种类型：柴胡栏子金矿床为蚀变岩型金矿；莲花山和红花沟金矿床属石英脉型。

You were home and it was two weeks ago.

你回到了家里。当时是两周前。