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For the floating body with complex bow and stern, the molded line reconstruction method is adopted to generate the section lines on the bow and on the stern which are necessary to construct the wetted surface, and it can raise efficiency greatly that the intersection lines of intersection structures are obtained by the way of combining modeling tool and NURBS technology; then the patch representation method is adopted in generating the mesh of wetted surface and interior free surface, and the velocity potentials on them are expressed separately, on basis of which the irregular frequency effect is dealt with in the calculation of hydrodynamic coefficients.

对于有复杂首尾结构的浮体,用型线重构的方式在首尾生成曲面构成所需要的截面线,将通用建模工具和NURBS曲线拟合相结合,生成相贯结构的相交线;然后,用分片法生成浮体湿表面及内自由面网格,并独立表达各自的速度势以处理不规则频率现象,进而进行水动力系数计算。

The results demonstrate that the pump transportation behavior of concrete can be better evaluated using the inverted slump cone to measure the outflow time for all concrete, slump spread and slump constant.

结果表明:采用倒置坍落度筒测定拌合物全部流出所需时间,辅以扩展度和坍落度,可以较好地评价混凝土的泵送性能,水胶比仍然是影响混凝土流动性和抗压强度的主要因素。

In the present dissertation, a surfactant-templated mesoporous silica molecular sieve with high pore volume, high porosity and narrow bimodal mesopore size distribution was synthesized for the first time in a reaction system, which was used usually in the synthesis of mesoporous MCM-41 molecular sieves, by a judiciously controlled two-phase sol-gel processing under basic conditions.

在本论文中,我们通过对一个通常用于制备介孔MCM-41分子筛的反应体系中正硅酸乙酯水解与缩合反应相对速率的精确调控,首次在弱碱性体系中合成了一种具有高孔隙率、大孔体积和双介孔孔分布特征的新型二氧化硅分子筛材料,简记为BMS,并对BMS二氧化硅分子筛中双介孔结构形成的原因及各种可能对其结构和性质产生影响的合成因素如Ammonia/silica摩尔比、组分浓度的变化、表面活性剂烷基链长度的调节、辅助有机物均三甲苯的引入、催化剂的结构和性质、溶剂和助溶剂的极性和用量、老化和干燥条件的变化及合成后水热处理等,利用不同的测试手段如XRD,SEM,TEM,〓Si MAS NMR,TG-DTA,N〓吸附测试等进行了系统的表征研究。

In this report, half-esterification between these pendent hydroxyl groups of hydroxyl-PU and maleic anhydride could lead to new pendent groups, carboxylic groups. These highly polar carboxylic groups in the side chain of PU could play the role of internal emulsifier. They had self-dissociation ability in the water or were neutralized first by appropriate amount of base. Then, PU bearing carboxylic group could dispersed steadily in the water, named aqueous-based polyurethane dispersion.

在本论文中,利用原来亲油性Hydroxyl PU主链段上悬挂的羟基经由与琥珀酸酐的半酯化(Half-esterification Reaction)反应后,使PU在侧链上悬挂具有强极性的羧酸基,其可作为聚胺酯分子中的内乳化剂,羧酸基能在水相中自身解离产生离子或加入适量碱使之中合,使聚氨酯高分子能够稳定分散於水中,即所谓水性PU分散液(Aqueous-based Polyurethane Dispersion)。

Came to an old ox to drinking water around Dakoudakou, He Shangshu book, I can not help being caught in a meditation.

来到老牛身边大口大口地喝着水,合上书本,我不禁陷入了沉思之中。

The Knoevenagel condensations of various carbonyl compounds with active methylene compounds were reported in water medium without adding any catalyst.

报道了水相中无催化剂下各种羰基化合物与活泼亚甲基化合物的Knoevenagel缩合反应。

Chaper 3: Aldol condensations of aromatic aldehydes with ketones under solvent-free condition to synthesize α,β-unsaturated ketones in good to excellent yields using PEG400 and powdered anhydrous K2CO3 as catalysts at 90℃or 120℃were described.

第三章:在无溶剂条件下,由PEG400 和无水K2CO3催化芳香醛与酮的Aldol 缩合反应合成α,β?不饱和酮,得到较高的收率。

In fact, even better associating properties are presented by the corresponding fluorocarbon modified polymers.

实际上,相应的氟碳改性物在水溶液中往往表现出更优良的疏水缔合性能。

An airless, waterless stone and the prophetic image of our own earth when, some few million years from now, the senescent sun shall have lost its present fostering power.... And so on. This passage could easily be prolonged-a Study in Purple. But I forbear. Let every reader lay on as much of the royal rhetorical colour as he finds to his taste.

这块石头变心灰意冷了,没有空气,也没有水,它预示了几百万年后衰老的太阳失去孕育力量时的地球形象……这一段本可轻易延长——一项华丽的研究,但我克制住了,就让每位读者尽量涂抹鲜艳的华丽色彩来合其口味吧。

An airless, waterless stone and the prophetic image of our own earth when, some few million years from now, the senescent sun shall have lost its present fostering power.... And so on. This passage could easily be prolonged-a Study in Purple. But I forbear. Let every reader lay on as much of the royal rhetorical colour as he finds to his taste.

这块石头变冷了,没有空气,也没有水,它预示了几百万年后衰老的太阳失去孕育力量时的地球形象……这一段本可轻易延长——一项华丽的研究,但我克制住了,就让每位读者尽量涂抹鲜艳的华丽色彩来合其口味吧。

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This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。

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双标记神经干细胞的增殖、分化活力与未标记神经干细胞相比无改变。