非正的

Secondly, by linearizing the system at the unique positive equilibrium solution and analyzing the associated characteristic equation, it is found that the positive equilibrium solution is asymptotically stable when the delay equals to zero and when it is increased to certain critical value, the positive equilibrium solution will loss the stability and a spatially heterohomogeneous periodic solution will bifurcate from this positive equilibrium solution.

通过在系统唯一的正平衡解处线性化系统和分析相应的特征方程，发现在时滞等于零时该正平衡解是渐近稳定的，当时滞逐渐增大到某个临界值时该正平衡解将失去稳定性而且在该平衡解处分支出空间非齐次的周期解。

Chemical deoxygenation shows that the ternary systems including Zeph, Triton X-100, OP and SDBS exhibit no or a little phosphorescence enhancement upon addition of Na〓SO〓 to the solutions and the surfactants without phenyl group give rise to greater phosphorescence enhancement.

试验了乙醇、正丙醇和正丁醇对非离子表面活性剂参与三元体系光谱的影响。

The system parameters are determined by optimizing an output-error cost function. To deal with the non-uniqueness of the fully parameterized state-space system, a projected gradient search algorithm is presented by restricting the update of the parameters to the tangent space to the manifold of observationally equivalent state-space systems. The sufficient condition to employ L-M algorithm for optimizing parameters is also introduced. The proposed hierarchical optimization identificationmethod includes two steps: First, the parameter search direction is determined by the proposed adaptive L-M projected gradient approach; Second, the optimum step size is computed according to a line search method.

通过极小化输出误差目标函数获得了系统参数估计；提出了正交梯度搜索方法用于解决系统参数的非唯一性问题，正交梯度搜索的本质是在输入-输出等价类相切平面的正交垂空间更新系统参数；给出了用 L-M 算法进行参数优化的充分条件；提出的系统参数递阶优化辨识方法包括两步：首先用给出的自适应 L-M 算子正交梯度方法确定参数优化方向；其次由一维搜索方法计算最佳步长。

It is shown that let R be right nonsingular AGP-injective rings, if R be right CF rings and every right principal ideal is two-side ideal, then R is Von Neumann regular ring.

证明了设R是右非奇异右AGP-内射环，如果R是右CF-环且每个主右理想都是双边理想，则R是正则环，其次，讨论了右AGP-内射环的非奇异性。

Based on the concept of the non-proportional damping which may be divided into the proportional part for dissipation of energy and the nonproportional part for transformation of energy, a new modal superposition pseudo-force method is presented if the approximate decoupling method is not suitable. In this method the coupled modal equations are solved by iteration in which the coupling terms are treated as pseudo-force and set to the right side of the equations.

在不能进行近似解耦分析时，基于非比例阻尼可分为耗散能量的比例部分和转换能量的非比例部分这种概念，建立了一种拟力实模态叠加法，即把正则化的耦合模态方程中代表非比例阻尼部分的耦合项作为虚力，放到方程的右端，再运用迭代法求解。

METHODS: A series of N-octyl-N'-succinyl chitosan labeled with fluorescein, were incubated with HepG2 liver cancer cells, K562 leukemia cells, A549 human lung cancer cells, and BGC cancer cells respectively and followed by using flow cytometry and enzyme-linked immunosorbent assay to assess the affinity and inhibition of N-octyl-N'-succinyl chitosan for the four kinds of tumor cells already mentioned.

用异硫氰酸荧光素对N-正辛基－N'-琥珀酰基壳聚糖进行标记，再分别与人肝癌细胞(HepG2)、人白血病细胞(K562)、人非小细胞肺癌细胞(A549)及人胃癌细胞共培养，通过流式细胞仪及酶联免疫检测仪测定N-正辛基－N'-琥珀酰基壳聚糖对肿瘤细胞的亲和性及抑制力。

Under this background, non-themal sterilization becomes more widely used, including the adoption of aseptics, deliminating microorganisms by centrifuge and radiate processing.

因而非热处理正得到人们越来越广泛的关注，非热处理包括添加防腐剂抑制微生物、离心分离去除微生物、辐射处理杀灭微生物等。

Flow pattern computation is carried out by using a modified function of stream function Laplace equation proposed by the author, and the flow fields of heterogeneous goafs with complicated shapes and along the boundary direction can meet the condition of orthogonality of flow net, and at the same time the orthogonality can be controlled by the precision of split meshes.

指出用 流函数Laplace方程修正函数，对复杂形状和沿多边界方向非均质的采空区流场计算，仍能满足流网正交，其正交性可通过剖分网格精度来控制。

The prevalence of character limitations was significantly higher in left-behind children (64.4%) than in non-left-behind group (47.6%; x^2=21.25, P.01). The depressive symptoms score of the left-behind children was significant higher (40.4%) than that of the non left-behind group (27.8%;χ^2=13.78, P.01). Scores of EPQP and EPQN were positivey correlated with scores of CES-DC scale (r=0.198, r=0.372; P.01). Ten variables influenceing the personality traits and depressive symptoms of children were age, sex, peer interaction, parents' expectation for children, consanguineous marriage of parents satisfaction to family condition, self-estimate, academic achievement, frequency of meeting with the parents, and psychiatric history of family.

结果 留守儿童精神质、神经质得分分别为(5.25±2.56)，(9.48±5.33)分，高于非留守儿童的(4.79±2.16)，(8.10±497)分，差异有统计学意义(P.05， P.01)；留守儿童个性偏差检出率为64.4%，高于非留守儿童的47.6%(χ^2=21.25， P.01)；抑郁症状检出率为40.4%，高于非留守儿童的27.8%(χ^2=13.78， P.05)； CES-DC得分(18.24±8.65)分，高于非留守儿童的(15.85±7.45)分(P.01)；相关分析提示，EPQ中精神质、神经质量表与CES-DC呈正相关(r=0.198， r=0.372， P.01)；儿童性别、年龄、同伴交往、父母近亲结婚、家庭状况满意度、自我评价、学习成绩、与父母见面频率、父母期望、精神病家族史共10个变量影响着留守儿童的个性和抑郁情绪。

According to density of particle numbers and energy of perfect quantum gas ,by strict theoretical calculation ,the energy of non relativity and relativity about perfect quantum gas under high temperature and low density is given.

根据理想量子气体的粒子数和能量的密度，通过严格的理论推算，给出理想量子气体在高温低密度条件下非相对论和极端相对论能量；再由巨正则系综中能量和压强相对涨落的公式，采用合理的近似方法，给出巨正则系综能量和压强相对涨落的严格解，并将其与正则系综对比，完备地展示两种系综在强度量的涨落方面热力学的等价性和个性差

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。