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The crystallizability and solution properties of polyacrylate depressants and their depressive effects on two waxy oils were studied. It was found that the crystallizability of PA depended on the length of its side chain and molecular weight. Gel was observed in the concentrated solution, The temperature of gelation, which was a measure of the crystallizability of PA in solution, was higher for the PA itself with stronger crystallizability.

对聚丙烯酸长链酯的结晶能力和溶液性质及其对两种含蜡油的降凝效果进行了研究,发现PA的结晶能力取决于PA侧链长度和相对分子质量,而其在溶液中形成冻胶或沉淀的温度(反映PA在溶液中的结晶能力)与PA本体的结晶能力有关,而PA对含蜡油的降凝效果则与PA在油中的结晶能力有关。

This makes more and more people pay more attention to studies and applications of numerical simulation in thermal recovery. In this research, we have developed a reliable mathematical model for thermal recovery, which takes a full consideration of the effect of viscos, gravitical and capillary forces on the three-phase flow of gas, water and oil, the effect of the temperature on the medium characteristics of liquid and solid, the phase equilibrium of gas-liquid in each component, heat transportation including connection, conduction and radiation as well as heat losses in both the overburn and underlying strata. In the space discreation of the mathematical model, we have proposed a new method based on the improvement of the conventional nine-points difference approximation, which has a higher difference accurancy.

本项研究以热力采油的主要机理为基础,充分考虑在粘性力、重力和毛管力作用下油水气三相流动,考虑温度对各种流体和固体介质物性的影响,考虑每一组分中汽液两相的相平衡,考虑热在地层中的传导、对流和辐射以及上下盖层的热损失,利用热力学第一定律、质量守恒定律和流体迁移定律,建立了正确可靠的注蒸汽数学模型;在对数学模型进行空间离散时,利用控制有限体积积分法,对以往的九点差分近似作了合理的改进,使其具有较高的差分近似精度:结果表明,该公式的近似精度要比以往文献中所给的九点差分近似精度高,可以认为,在油藏数值模拟中,如果遇到非均质情况,使用这种九点差分近似更合理。

The area backgrounds and conditions of this project are analyzed,then the following principles are worked out:in order to establish a good community of habitant,the neighbor hood size,the synthesis of .

随着 2 1世纪的到来,我国住区规划面临着新的挑战,福苑东里规划恰好是对此进行探索的机遇。在规划中,对我国 2 1世纪社区环境的发展方向进行了预测,对项目的用地及环境条件进行了分析,从而制定出两项规划原则:通过以人的认知范围确定邻里规模、多种功能的综合、构筑网络结构等手法营造社区性;以带状的公共绿地与宅前绿地结合,形成网状连续的交通、生态、景观、交往、休闲复合系

During the three-dimensional images of aircraft sequence types identified objectives, the purpose of this algorithm using iterative computation can rapidly and accurately identify a target.

在进行三维飞机序列图像的目标类型识别中,采用本文提出的自适应算法进行迭代运算,可以快速准确地进行目标识别。

This article is divided into several categories of questions, focus on a typical example of the Lagrange Mean Value Theorem to prove the application of the inequality summarized in the hope that readers can better grasp the Lagrange mean value theorem in the inequality in the application of skills .

本文将题型分成几类,集中典型例题,对拉格朗日中值定理在不等式证明的应用中进行归纳总结,希望读者能够更好的掌握拉格朗日中值定理在不等式中的应用技巧。

This article will write divides into several kinds, the centralism typical sample question, carries on the induction to the Lagrange theorem of mean in the application which the inequality proved to summarize, hoped that the reader can better grasp the Lagrange theorem of mean in the inequality application skill.

本文将题型分成几类,集中典型例题,对拉格朗日中值定理在不等式证明的应用中进行归纳总结,希望读者能够更好的掌握拉格朗日中值定理在不等式中的应用技巧。

The heat generation curves of seven rubber materials used in tires with the changes of temperature have been obtained by using Dynamic Mechanics Analysis technique on NETZSCH DMA242 instrument, knowing that the heat generation of every other rubber materials except inner liner rubber changes lightly alone with the temperature within 10℃~80℃. According to the Fourier law, the heat transfer coefficients of tire rubber are measured by stable method on self-made experiment instrument. The coefficients changes lineally within 20℃~80℃ and the relation formulas λ=λ〓+bt are given out attached with λ〓 and b. The specific heat of tire rubber are measured on Differential Scanning Calorimeter NETZSCH DSC204 and the relations with temperature are linear and the formula is c=c〓+bT, where c〓 and b gained from experiment result data are presented in the paper. The heat convection coefficients on the surface of rolling tire are measured according to the principle of heat-mass transfer analogy principle after simplifying rolling tire into rotating disk with straight movement on wind channel. The relation with rotation speed of disk is linear as h=5. 399+0.0258n and the relation with straight line speed of tire is linear too, h=

论文采用动态力学分析技术,使用NETZSCH DMA 242型实验仪,获得了轮胎用七种胶料的生热率随温度变化曲线,确知除内衬层胶以外,其它各种胶料在一般胎温范围内(10℃~80℃)的生热率随温度变化不大;轮胎胶料的导热系数根据傅立叶定律的基本原理,采用稳态法在自行搭建的实验台上进行测试,结果表明,材料的导热系数在20℃~80℃的温度范围内随温度呈线性变化,论文给出了各种材料导热系数的线性变化的关系式λ=λ〓+bt及其λ〓和b的值;轮胎胶料的比热运用差式扫描量热原理,在NETZSCH DSC204型DSC实验仪上进行测试,结果表明,胶料的比热随温度的变化呈线性变化,其关系可用c=c〓+bT表示,文中给出了根据实验数据拟合的c〓、b的值;对轮胎表面的对流换热系数的测定,本文先将滚动的轮胎简化为有直线运动的旋转圆盘,而后采用萘升华热质比拟技术,在风洞中测量了滚动轮胎表面的对流换热系数,结果表明,圆盘表面对流换热系数与转速呈线性关系,即h=5.399+0.0258n,轮胎表面对流换热系数与其直线运动的速度呈线性关系,即h=

It turned out reproduction rete of chrysanthemum was raised,the regular,non-plant diseases and insect pests could be offered to the market. Shoot tip were used as explants to study the effects of different sterilization methods, illumination intensity and concentrations of 6-BA and NAA on shoot propagation. Rooting with perlite, vermiculite and river sand instead of agar was studied. In the process of preliminary multiplication, the effect of using 0.1% HgCl_2 in sterilization of explants was better than using saturated bleaching solution. The highest multiplication rate was found under whole illumination. MS media with 6-BA from 0.2 mg·L~(-1) to 5 mg·L~(-1) and NAA from 0.05 mg·L~(-1) to 2 mg·L~(-1) were tested and as a result, the highest differentiation rate and the multiplication rate was reached with 0.2 mg·L~(-1) 6-BA, 0.05 mg·L~(-1) NAA.

本实验以菊花的茎尖为外植体,研究了不同灭菌方法,光照强度,全光照、半光照和弱光处理以及不同6-BA和NAA浓度及配比对于试管苗增殖的影响,并研究了珍珠岩、蛭石和河砂等琼脂替代物对于菊花生根的影响,结果表明:在初代培养物建立的过程中采用0.1%升汞进行表面灭菌的效果好于饱和漂白粉的灭菌效果;在全光照条件下外植体的增殖倍数最高;在试管苗增殖培养的过程中,以MS为基本培养基,并在培养基中添加0.2~5mg·L~(-1)6-BA和0.05~2mg·L~(-1)NAA,其中0.2mg·L~(-1)6-BA和0.05mg·L~(-1)NAA最适于外植体的分化和增殖,其分化率为100%,增殖倍数为12。

Seductive is, these two opinions not only the standard that had each side to the businessman of industry of B2B, B2C, still had a standard to the individual negotiant of C2C domain, ask the individual in trade must undertake with real name, at the same time terms of payment also must withhold conclusive evidence, involve the problem such as goods of exchange a purchase to want to find out legal responsibility to wait.

引人注重的是,这两份意见不但对B2B、B2C行业的商家进行了各方面的规范,还对C2C领域的个人交易者进行了规范,要求在交易中的个人必须以实名进行,同时支付方式也必须保留真凭实据,涉及退换货等问题要追究法律责任等。

The result of virtuous activities in the mode of goodness is declared purity, the result in the mode of passion is misery and the result in the mode of ignorance is nescience .

在善性的知觉觉知中施善行的结果是纯净,在欲望情感中追求行为的利益结果是苦难,在愚昧无知中进行的行为,其结果是愚昧。

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In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是,在否定句或疑问句里,这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷

Nusa lembongan : Bali's sister island, coral and sand beaches, crystal clear water, surfing.

Nusa Dua :豪华度假村,冲浪和潜水,沙滩,水晶般晶莹剔透的水,网络冲浪。