查询词典 necessary and sufficient conditions

Motivated by the i dea o f t he v ariable-structure c ontrol, t he c onception o f a pproaching region and leaving region of the switching boundary is developed. The sufficient conditions of whether sliding mode occurs or not on the switching boundary are obtained. Under the assumption of the switching delay time being positive, the sufficient conditions of quasi-sliding-mode occurring on the switching boundary are given.

受变结构控制思想的启发，提出切换线的趋近域和远离域的概念，进而得出系统在切换线上是否会发生滑动模态的充分条件。

First, the rural social security system should be developed in accordance with the national conditions, including economic and social development status quo, people's views and security traditions. Next, the thesis puts forward the guiding thought and general principles for the establishment of the system based on the national conditions, and clearly sets forth the idea of establishing the transitional rural social security system. Then, the thesis makes explanation and analysis respectively on the existing security types, hoping to find the proper components of the rural social security system that is suited to the conditions of the country. At last, the thesis puts forward the objective mode and transitional mode of the establishment of the system at the macro level. The objective mode is the development direction of the transitional mode, and the transitional mode is a necessary stage of the objective mode. Only when establishing the vigorous transitional mode that is suited to the national conditions and achieving development, can the objective mode be possibly realized in the self-evolution of the transitional mode.

首先，我国农村社会保障制度建设应当立足于我国的基本国情，包括经济社会发展现状、人们的观念、保障传统等方面；其次，在基本国情的基础上提出了建立我国农村社会保障制度的指导思想和一般原则，明确提出了建立过渡型农村社会保障制度的构想；而后，本文对农村社会保障现存的几种保障方式一一做出了说明和分析，以期为构建适合我国国情的农村社会保障制度模式找到合适的构成要素；最后，本文从较为宏观的层次提出了我国农村社会保障制度建设的目标模式和过渡模式，目标模式是过渡模式的发展方向，而过渡模式是目标模式建设的必经阶段，只有在建立适合国情具有活力的过渡模式并取得发展的基础上，目标模式才有可能在过渡模式本身的自我升级过程中逐步实现。

First of all,we tested the germination and water uptake rate of 47 species typical xerophil seeds grow up in north China from 20 families,38 genuses under sufficient water and different Grads water stress by high-molecular-weight polyethylene glycol(PEG6000).The results show that Xerophil seeds from the same habitat exhibited similar patterns in response to water stress.Xerophil seeds from arid community were stronger in germination and imbibition than that from other two communities under serious water stress,whereas Xerophil seeds from humid community were sensitive to any degree of water stress.Namely,the seeds live in arid habitat possessed high germination and quickly water uptake in sufficient water or any degree of water stress,but the others grow up in humid habitat shown significant difference which germination and water uptake well under sufficient water but inhibited even if slight water stress.

首先，我们通过对20个科，38属，47种旱生植物种子在水分充足和不同梯度的干旱处理(聚乙二醇PEG6000)条件下的萌发率及吸水率实验发现，当水分胁迫强烈时，分布于干旱沙漠地区的植物种子其吸水率和萌发率都高于半干旱和湿润地区的植物群落，相反，湿润地区植物种子的吸水率和萌发率对任何的水分胁迫都表现出敏感的响应趋势，也就是说，生境恶劣的植物种子在较强的干旱胁迫下，仍然保持了较高较快的萌发率及吸水率，水分充足与水分缺乏时无显著差异，而生境相对较好的植物种子在水分充足情况下萌发与吸水良好，但在干旱胁迫时则受到明显抑制，水分充足与水分缺乏时差异显著。

As the development that studies to structure of protective screen of kidney spherule filtration and function, it is normal to realise VEGFR of sufficient cell surface shares sufficient cell gradually of structure and function maintain, mix in injury sufficient cell wither dies certain effect is produced in the process.

随着对肾小球滤过屏障结构和功能探究的深入，逐渐熟悉到足细胞表面VEGFR参和足细胞正常结构和功能的维持，在损伤和足细胞凋亡过程中发挥一定功能。

We affirmed clearly and definitely that the universal moral law which represented by the three absolute orders is the necessary and sufficient conditions of legitimacy and the necessary prerequisites of reasonability of the leagal right, and then found the binding point among the freedom philosophy and economic analysation

明确肯定以合理理解的三大绝对律令为代表的普遍道德法则是法律权利正当性的充要条件及其合理性的必要条件，初步找到了法律的&自由哲学&与法律的经济分析之间的结合点，为法治国家的立法、执法及司法活动提供一种可能的纲要性指导。

In this project, we study the theory of higher order differential equations in Banach spaces and related topics. We solve an open problem put forward by two American Mathematicians and two Italian Mathematicians concerning wave equations with generalized Weztzell boundary conditions, introduce an existence family of operators from a Banach space $Y$ to $X$ for the Cauchy problem for higher order differential equations in a Banach space $X$, establish a sufficient and necessary condition ensuring $ACP_n$ possesses an exponentially bounded existence family, as well as some basic results in a quite general setting about the existence and continuous dependence on initial data of the solutions of $ACP_n$ and $IACP_n$. We set up quite a few multiplicative and additive perturbation theorems for existence families governing a wide class of higher order differential equations, regularized cosine operator families, regularized semigroups, and solution operators of Volterra integral equations, obtain classical and strict solutions having optimal regularity for the inhomogeneous nonautonomous heat equations with generalized Wentzell boundary conditions, gain novel existence and uniqueness theorems,which extend essentially the existing results, for mild and classical solutions of nonlocal Cauchy problems for semilinear evolution equations, present a new theorem with regard to the boundary feedback stabilization of a hybrid system composed of a viscoelastic thin plate with one part of its edge clamped and the rest-free part attached to a visocelastic rigid body. Also we obtain many other research results.

在本研究中，我们对Banach空间中的高阶算子微分方程的理论以及相关理论进行了深入研究，解决了由美国和意大利的四位数学家联合提出的一个关于广义Wentzell边界条件下的波动方程适定性的公开问题，恰当地定义了Banach空间中的高阶算子微分方程Cauchy问题的算子存在族及唯一族，建立了齐次和非齐次高阶算子微分方程Cauchy问题适定性的判别定理，获得了关于高阶退化算子微分方程的算子存在族、正则余弦算子族、正则算子半群、Volterra积分方程解算子族的乘积扰动和混合扰动定理，得到了关于以依赖于时间的二阶微分算子为系数的一大类非自治热方程非齐次情形下的时变广义Wentzell动力边值问题的古典解、严格解的最大正则性结果，获得了半线性发展方程非局部Cauchy问题广义解和经典解存在唯一的判别条件，从实质上推广了现有的相关结果；得到了一部分边缘固定而另一部分附在一粘弹性刚体上的薄板构成的混合粘弹性系统的边界反馈稳定化的新稳定化定理，还建立了一系列其他研究结果。

Cosmetology costumes are doing a necessary condition for a woman is not necessary and sufficient conditions.

服饰美容是做好一个女人的必要条件，不是充要条件。

Dress beauty to a woman is a necessary condition is not sufficient and necessary conditions.

服饰美容是做好一个女人的必要条件，不是充要条件。

Subject to the conditions of this section and to such terms and conditions as the Administrator determines to be necessary to carry out the purposes of this title, the Administrator is authorized to guarantee, and to make commitments to guarantee, the principal and interest (including interest accruing between the date of default and the date of the payment in full of the guarantee) of any loan, obligation, or participation therein of any State, municipality, or intermunicipal or interstate agency issued directly and exclusively to the Federal Financing Bank to finance that part of the cost of any grant-eligible project for the construction of publicly owned treatment works not paid for with Federal financial assistance under this title, which project the Administrator has determined to be eligible for such financial assistance under this title, including, but not limited to, projects eligible for reimbursement under section 206 of this title. No guarantee, or commitment to make a guarantee, may be made pursuant to this section—(1) unless the Administrator certifies that the issuing body is unable to obtain on reasonable terms sufficient credit to finance its actual needs without such guarantee; and (2) unless the Administrator determines that there is a reasonable assurance or repayment of the loan, obligation, or participation therein. A determination of whether financing is available at reasonable rates shall be made by the Secretary of the Treasury with relationship to the current average yield on outstanding marketable obligations of municipalities of comparable maturity.

依于这个部分的条件和对如此期限和条件象管理员确定是必要执行这个标题的目的，管理员被批准保证，并且做承诺保证，主要和兴趣(包括兴趣累积在缺省日期和付款的日期之间充分保证)的任何贷款，义务，或参与在其中任何状态，自治市，或intermunicipal 或跨境代办处直接地和完全被发布对联邦财务银行提供经费一部分的任何授予合格的项目的费用为公开地拥有的治疗工作的建筑没被支付以联邦经济援助在这个标题之下，哪个项目管理员确定是有资袼这样的经济援助在这个标题之下没有保证，或承诺做保证，可以被做寻求这个部分(1)除非管理员证明发布的身体无法获得在合理的期限充足的信用提供经费给它的实际需要没有这样的保证；并且(2)除非管理员确定有贷款的合理的保证或偿还，义务，或参与在其中。

The influences of derivations and adjoint ideal semigroups of prime ring with characteristic 2 on the prime ring are discussed, and several sufficient conditions for the prime ring being communitive ring or S4-ring and some necessary conditions for a class of prime rings being communitive rings are obtained.

先给出了一个利用导子和理想来判断素环的可交换性结论的证明，然后讨论了特征为2的素环的导子和归联理想半群对这个素环的影响，得到了素环成为交换环或者S4-环的几个充分条件及一类素环成为交换环的必要条件。

Metrorrhagia is also gynaecological problems of common diseases.

崩漏是妇科常见病也是疑难症。

WordFTP gives you the convenience and timesaving you need.

wordftp让您的方便和省时您所需要的。