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By means of the semigroup theory, spectrum theory, positive cone theory, integrated equation theory and optimal control theory, we obtain the existence of thresholds of these models, the existence and stability of the infection- free equilibrium and the endemic steady state, and the existence of optimal vaccination strategies, etc.

运用泛函分析中的半群理论、谱理论、正锥理论以及积分方程理论和最优控制理论,系统地研究了这些模型的阈值的存在性,无病平衡态和地方病平衡态的存在性和稳定性,最优接种疫苗策略的存在性等。

Through the experiments on hydration of AH in the following sulphate(Li_2SO_4、MgSO_4 、 Al_2(SO_4)_3 、MnSO_4 、CuSO_4 、CoSO4 、CdSO_4 、ZnSO_4 、NiSO_4 、FeSO_4), dissoluble sulfate hydrate origining from hydration process of AH affects it's hydrous rate, hydrous rate of AH does not connect with Z/R of cation in stimulation, theory that Z/R affect hydrous rate of AH does not exist. Third, hydration of AH in dissoluble sulfate complies with dissolve-nucleate -grow theory, concentration of Ca~2+ from dissolving of CaSO_4 is higher than one of CaSO_4·2H_2O, calcium sulphate dihydrite gets a motivity of crystallization. dissoluble sulfate takes the following function: double-salt or dissoluble sulfate hydrate from hydration of AH in it becomes heterogeneous particle and a kind of nucleation catalyzer, and reduces surface barrier when DH becomes crystal because the crystal of DH precedently appears in uneven place. Results indicate hydration of AH does not conform with double-salt theory, but it conform with this mechanism: dissolve-nucleate-grow, formation of DH is an uneven nucleation and crystalizaion process.

通过对CaSO_4在Na_2SO_4 、K_2SO_4 、Rb_2SO_4 、Cs_2SO_4 、(NH_4)_2SO_4溶液中水化过程,以及CaSO_4·2H_2O、CaSO_4与以上硫酸盐反应速度、产物的研究,说明复盐理论不正确;CaSO_4在(Li_2SO_4、MgSO_4 、 Al_2(SO_4)_3 、MnSO_4 、CuSO_4 、CoSO_4 、CdSO_4 、ZnSO_4 、NiSO_4 、FeSO_4)溶液中水化,水化过程中硫酸盐水合物的析晶影响着无水硫酸钙水化,与激发剂阳离子Z/R值大小无关,阳离子的Z/R参数影响水化率的规律并不存在; 3、无水硫酸钙在可溶性硫酸盐中的水化按照溶解-成核-生长理论进行,CaSO_4达到溶解平衡时Ca~2+的浓度大于CaSO_4·2H_2O溶解平衡的Ca~2+的浓度,CaSO_4·2H_2O获得结晶的驱动力,可溶性硫酸盐起到形成晶核的作用:水化过程与CaSO_4生成复盐或析出水合物所形成的细小物相,作为异质微粒使母相中存在不均匀性,这些不均匀性有效地降低成核时的表面能位垒,使CaSO_4·2H_2O晶核优先地在这些具不均匀性的地方形成,因此这些物质起成核催化剂作用。

In the algorithm,the theory of particle system changing from non-equilibrium to equilibrium is used to define the Rank function and Niche function for solving multi-objective problems,all the individuals in the population have chance to participate the evolving operation to solve the Pareto optimal solutions of the multi-objective problems fast and evenly.

由于该算法使用了粒子系统从非平衡达到平衡的理论来定义求解多目标问题的Rank函数和Niche适应值函数,使得种群中的所有个体都有机会参与演化操作,以达到快速、均匀地求出多目标优化问题的Pareto最优解。

The state of thermal equilibrium is a function of temperature, but also in the same system in the heat balance of the various objects with the same temperature.

热平衡的态函数就是温度,而且在同一系统中热平衡的各个物体具有相同的温度值。

The results show that, with the increase in ionic strength, the adsorbed amount of taurine on the resin D290, the distribution coefficient λ and the fraction of zwitterion Tau(superscript ±) all decrease, while the pH value of the solution at the equilibrium and the content of anionic taurine Tau(superscript -) increase. Moreover, it is found that, at a certain taurine concentration, the increase in ionic strength may improve the selectivity of the anion resin for taurine.

研究结果表明:(1)随着溶液离子强度的升高,阴离子树脂对牛磺酸的平衡交换吸附容量逐渐降低,牛磺酸在树脂上的分配系数λ逐渐下降;(2)随着溶液离子强度增大,达到平衡时液相的pH值升高,溶液中牛磺酸阴离子Tau含量迅速增加,而牛磺酸两性离子Tau含量迅速降低;(3)在一定的牛磺酸浓度范围内,溶液离子强度增大,有利于提高离子交换树脂对牛磺酸的选择性。

Inspection-and-ink balance, acidometer respectively measuring the pH value, such as imbalance of acetic acid or base can be used in conciliation.

检验水墨平衡,用酸度计分别测其pH值,如不平衡可采用醋酸或碱进行调解之。

The range of IBD is between 0 and 1,successively corresponding to complete balance and enure imbalance for the amino acid profile of a sample.

当样品中氨基酸完全平衡时,IBD取值为零;而当其氨基酸平衡最差时。

Based on the equilibrium equation, the states of self-stress and the modes of inextensional mechanisms are solved by the singular value decomposition method.

在建立空间杆件体系平衡方程的基础上,采用广义逆方法求解各种情况下的平衡方程,采用奇异值分解方法求解索杆的机构位移模态和自应力模态,并推导了力密度方法的基本公式。

In order to enhance reliability, this paper presents a new realization scheme. The scheme using current instantaneous value to detect the branch circuit which is serving, and the branch circuit permuted and combinated with recursion algorithm till the difference of each busbar balances.

针对这一问题,本文提出了一种新的自适应运行方案,使用电流瞬时值来检出有流支路,再利用递归算法算出两段平衡的小差,然后对两段小差不断进行平衡校验。

When life does not get on well with work, he redresses the balance.

听力译文(J=詹姆斯P=帕玛拉M=麦尔文) P詹姆斯在你辉煌的事业中你比别人更成功是走运吗 J这一点我不争辩事实上我是既是幸运又幸福 62 M那么说确切一些你把成功归结于什么呢 J我的哲学一直是找出自己从中能得到满足的工作 P大概也是能使你从中得到乐趣的荼 J绝对正确 M那跟我们说说你的秘密 J嗯在我工作的日子里我总问自己某些问题主要是在我感到不满意的时候 P对自己不满 J这么说吧对自己的生活感到不满职业方面的和个人生活方面的每次做出的回答都能给我指出新的方向或新的奋斗目标 M你问了哪些问题 J显然事业早期主要的问题都是关于钱的例如想挣的更多吗如果回答是肯定的那我就在采取步骤去实现或者使老板相信我值更多的薪水或者另谋职务首先钱对我是主要动力 P那么在你需求的阶梯上下一项是什么 J嗯下一项跟钱同样重要的是得到人们的承认别人真正懂得珍视我的努力吗如果回答是否定的那就到了应该打破原先平衡的时候这样方能谋求我理应得到的那份尊重 M照你这么一说你是把得到承认和金钱放在同样的位置了 J当然这样了接下来的便是责任我需要接受更多的挑战不仅是为了挑战本身而且我也从担负较多的责任中获益匪浅走向成功确保事事都顺利一旦有点差错就勇担其责当然责任大了必然需要更多的支持不言而喻当今成功的群体全都是由各种职业的人才组成的简单地说责任加支持就是我想要的 P毫无疑问你在鲁毕康组建了这样一个成功的团队 J确实如此他们无疑是与我共过事的同事中最有才华的无论是工作上还是其它方面我们观点一致相互配合达成默契 M詹姆斯我看你在鲁毕康达到了成功的顶峰 J我同意这点事实上在鲁毕康的最后期间我已经实现了自己大部分的目标我需要更多的时间来发展业余爱好顺便提一下我的妻子一直忠实地支持我是我坚强的后盾她认为我应该在工作会议之外多花些时间于是我开始培养一系列的业余爱好一些我以前总是浅尝辄止但从未真正精通的事情比如打高尔夫球或看优秀小说 P退出权力核心对你来说困难吗 J一点儿也不更多的时间用于业余爱好这正是我所想要的我还希望假期更长些一般说来别人认为你应抽出两周来恢复精力我想我的精力一直在很好地恢复不过需求总是在变化的我需要休息时间和假若来好好考虑下一步 P那么我们要看到詹姆斯里布鲁德卡潇洒退出公众生活了 J不是这样正如我刚才说的需求总是在变化的我的巾是总要把握住平衡我现在所处的位置使有足够的空间去做自己想做的事情总的来说我到目前为止对自己的生活十分满意 M剩下还有什么 J找到更多自己想做的事这是个挑战是寻求生活中更丰富内容的挑战

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Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克,果实色泽鲜艳,汁多味浓,甜酸适口,离核仁甜,清末时就驰名陕、甘两省,清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异:红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感,ED90值分别为47.65、71.67和29.17g/hm2;春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感,ED90值分别为96.91、114.20g/hm2;而番茄不敏感。

However, I have an idea.

不过,我有个主意。