Firstly, using strategy of introducing associated auxiliary equation to a givenpartial differential equation without admitting Lagrangian, we make the extendedequations possess a variational principle. Based on this, the concepts of extendedconservation law and extended symmetry to given partial differential equationare put forwarded.

首先91超碰在线观看，我們給出了引入伴隨方程擴(kuò)充原方程的策略，使給定偏微分方程的擴(kuò)充方程組具有對(duì)應(yīng)泛函，即稱為L(zhǎng)agrange系統(tǒng)的方法，以此為基礎(chǔ)提出了作為偏微分方程傳統(tǒng)守恒律和對(duì)稱概念的一種推廣—偏微分方程擴(kuò)充對(duì)稱和擴(kuò)充守恒律的概念人人模人人操生活网；其次，先給出以得到的Lagrange系統(tǒng)為基礎(chǔ)欧美自拍另类综激情亚洲，利用N欧美操逼网址？

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.

本項(xiàng)研究以熱力采油的主要機(jī)理為基礎(chǔ)，充分考慮在粘性力97资源共享夫妻福利视频、重力和毛管力作用下油水氣三相流動(dòng)，考慮溫度對(duì)各種流體和固體介質(zhì)物性的影響国产精品欧美久久让激情，考慮每一組分中汽液兩相的相平衡国产午夜免费A片完整版视频网站，考慮熱在地層中的傳導(dǎo)、對(duì)流和輻射以及上下蓋層的熱損失黄片短视频久久，利用熱力學(xué)第一定律伊人影院在线操在线干影院、質(zhì)量守恒定律和流體遷移定律，建立了正確可靠的注蒸汽數(shù)學(xué)模型18禁啪啪啪网站；在對(duì)數(shù)學(xué)模型進(jìn)行空間離散時(shí)caopo超碰地址发布页用户登录，利用控制有限體積積分法，對(duì)以往的九點(diǎn)差分近似作了合理的改進(jìn)日韩AV一级毛片久久久，使其具有較高的差分近似精度：結(jié)果表明成人免费黄网站，該公式的近似精度要比以往文獻(xiàn)中所給的九點(diǎn)差分近似精度高，可以認(rèn)為自拍偷拍唯，在油藏?cái)?shù)值模擬中影音先锋天堂最新少妇av，如果遇到非均質(zhì)情況，使用這種九點(diǎn)差分近似更合理欧洲一级爆干。

Multiple blood samples were taken for measurement of the time course of the drug concentrations, and the electrocorticogram processed (approximate entropy, for propofol and methohexital and percentage high frequency time, for ketamine) to numerically quantify drug effect.

結(jié)果：使用藥代/藥效分析法得出的t1/2Keo：氯胺酮為2.0±0.4min91原创国产在线，異丙酚為2.7±1.1min，而美索比托的t1/2Keo為0.3±0.1min明顯較前兩者縮短韩av.com。藥代/藥效分析法和總體守恒分析法在藥物到達(dá)峰值的時(shí)間舉無(wú)明顯差異自拍偷拍欧美综合。

Developments in physics since the time of Newton make the law of momentum conservation appear to be more fundamental than Newton's third law.

牛頓時(shí)代以來(lái)物理學(xué)的發(fā)展，使動(dòng)量守恒定律顯得比牛頓第三定律還重要3344300部。

To use the field concept and its language consistently, we must regard the magnetic field as a store of energy. Only in this way shall we be able to describe the electric and magnetic phenomena in accordance with the law of conservation of energy.

為了一致地應(yīng)用場(chǎng)的概念和它的語(yǔ)言婷婷综合一区，我們必須將磁場(chǎng)當(dāng)作能的儲(chǔ)存所AA成年人网站，只有這樣才能使我們能夠按照能量守恒定律來(lái)描述磁和電的現(xiàn)象。

In Chapter 3 relaxation in growth with a conservation law is studied, and reduced roughness of the surface due to the effect of relaxation is found. The last chapter includes discussions of point defects in conservational surface growth.

第三章研究了守恒界面生長(zhǎng)中界面弛豫效應(yīng)的影響日本AA视频，發(fā)現(xiàn)弛豫作用使得守恒生長(zhǎng)的界面粗糙程度下降色九九在线视频精品9999；第四章研究了雜質(zhì)點(diǎn)缺陷的存在對(duì)生長(zhǎng)表面的影響，發(fā)現(xiàn)存在于生長(zhǎng)的活躍表面層中的點(diǎn)缺陷會(huì)使表面的局域粗糙度增加91麻豆精品福利在线观看。

EMHYDR HR oils have excellent oxidation stability and demulsibility, enabling ready separation of entrained water and giving long life without formation of harmful sludge.

守恒定律使我們能夠就可得出有關(guān)原子穩(wěn)定性的具有深遠(yuǎn)意義的結(jié)論亚洲一级网站，而不需要對(duì)原子核內(nèi)起作用的力作任何假設(shè)。

Based on the analysis of current oscillation region of stable electric fielddomains in I-V curve,it is shown that when the applied bias voltage is changedwithin positive slope regions of I-V curve,the domain boundary between the high-and low-electric field domains does not moved,and the size of electic fielddomains regions is also not altered,while the electric filed strengths are adjusted tokeep the current conservation.

通過對(duì)穩(wěn)態(tài)電場(chǎng)疇情況下I-V曲線中電流振蕩區(qū)域的分析国产免费av网站网址，證明當(dāng)外加偏壓在正微分電導(dǎo)區(qū)變動(dòng)時(shí)国产操逼视频免费，超晶格的高低電場(chǎng)疇之間的疇邊界不發(fā)生移動(dòng)，疇的大小不變中文字幕十二页，只是相應(yīng)的電場(chǎng)強(qiáng)度做些調(diào)整以使電流守恒成立深夜在线观看免费。