系统发生

To realize real time fault detection and diagnosis when multi sensors have faults simultaneously in the linear control system, a set of two ellipsoid confidence region s was constructed based on two ellipsoid overlap method.

双椭圆相交法可以用于多个传感器同时发生故障的线性控制系统，不仅能够快速、准确地检测出故障发生的时刻，并且能将故障定位到发生故障的传感器。

The 21st century is a century of life science,the mathematical biology advanced rapidly, and the study in determinate system is perfect. In face,the species ecology systems are often subject to ,some uncertain factors,white noise,whether the presence of such noise affects these results that we have obtained has received exten sive attention ,which makes the study about stochastic system more and more important.

21世纪是生命科学的世纪，生物数学的发展突飞猛进，百花争妍，其中对确定性系统的研究已经较为完善，而实际上的种群系统常受到一些不确定性因素的干扰，即白噪声的干扰，研究白噪声的存在是否影响种群生态系统以及是否使原有的结果发生变化已受到广泛的关注，这就使对随机系统的研究显得尤为重要。

After the collision, Shanghai Municipality organized an investigation group for this accident and came to a conclusion in a shortest possible time: it is an omission in the design that caused a wrong instruction, so the down-train directly collided with a normal turn-back train on the side due to insufficient braking distance, and the accident thus happened.

事故发生后，上海市政府迅速组成事故调查组，并在最短时间内对事故作出了结论。事故的直接原因是：由于设计疏漏，造成信号系统发出错误指令，致使列车制动距离不足，使下行列车与正在折返的列车发生侧面冲撞，导致了该事故的发生。

Mark Okusa, a nephrologist and professor of medicine at the University of Virginia Health System, has won two grants totaling $1.2 million over four years to test whether certain drugs can interrupt the inflammatory process that occurs in diabetic kidney disease.

一般而言，炎症是因身体受伤而发生的一种非特定性的免疫反应，据此，来自美国维吉尼亚健康系统的MARK博士已获得两项计120万美元的资助，计划于4年内测试是否某些药物能够中断发生在糖尿病肾病病人体内的这种炎症发生过程。

With radiation of the underfloor air conditioning system is one special underfloor air conditioning system, in this kind of system, static pressure box under the floor can not be taken insulation work, so, after some time, the surface temperature of the floor will change, can have a certain impact on hot wet load in the room, thus cause the change of state of underfloor air conditioning system.

带有地板辐射的地板送风空调系统是一种特殊的地板送风空调系统，这种系统中，室内地板下的空调静压箱不采取保温措施，因此，经过一段时间以后，地板的表面温度会发生变化，可以对室内的热湿负荷产生一定的影响，从而引起空调系统的送风状态的改变。

Subjects had more serious symptoms, more quickly onset of vection and more short rotation time when they were lying.

不同强度视觉与前庭系统感觉冲突影响视运动错觉的发生时间和旋转耐受性，表现为冲突越强，视运动错觉发生的时间越早，旋转耐受时间越短；视觉与前庭神经系统感觉冲突的增加可加重晕动发生时的症状。

The results were showed that embryogenic calli were induced from young leaves, which were cultured on MS medium supplemented with 2,4-D 2mg/L and KT 0.2mg/L. For the proliferation of embryogenic calli, the suitable culture medium was MS+BA 8mg/L +NAA 1mg/L. The development and maturation of somatic embryo could be much improved by using the medium of MS+ZT 2mg/L or BA 5mg/L +IAA 0.2mg/L. For the induction of secondary somatic embryo from integral somatic embryo, the suitable culture medium was MS+KT 0.1mg/L+NAA 0.01 mg/L or MS+ZT 0.1mg/L+NAA 0.01 mg/L, the proliferation frequency is 214%, 256% respectively. The cotyledonary generated from somatic embryos of Aesculus hippocastanum L.

本文就欧洲七叶树的组织培养和体细胞胚发生以及植株再生进行了系统研究，主要结果如下：以植物细胞具有全能性的理论为依据，以欧洲七叶树幼嫩叶片为外植体，进行体细胞胚胎发生研究，研究结果表明，诱导愈伤组织的适宜培养基是MS+2，4-D 2mg／L+KT0.2mg／L，MS+BA 8mg／L+NAA 1mg／L有利于胚性愈伤组织的诱导和增殖，添加ZT 2mg／L或BA 5mg／L和IAA 0.2mg／L的MS培养基有利于体细胞胚发育和成熟，体细胞胚可直接诱导次生胚发生，MS+KT 0.1mg／L+NAA 0.01 mg／L或MS+ZT 0.1mg／L+NAA 0.01 mg／L培养基诱导效果最好，增殖频率分别为214％、256％。

This paper also discusses institution supply and implementation performance of government accounting reform institutionally.

权责发生制政府会计改革的关键是通过在政府会计中引入权责发生制会计基础而建立权责发生制政府会计系统。

The inverse model of the system which can be established by neural network according to the UAV's movement is connected with the object controlled so that the nonlinear and correlative system will become linear and irrelated. PID reactive control is used to improve the performance.

根据无人机发生故障时非线性运动的特点，确定适当的神经网络结构建立无人机非线性系统的逆系统，并与被控对象串连可以对非线性耦合系统进行线性化解耦，然后引入PID反馈控制进一步提高神经网络逆控制系统的性能。

The rub-impact between rotor and stator often occurs because the rotor shaft stiffness decreases following the occurrence of the crack in the rotor shaft, and thus the coupling fault with rub-impact and crack is hackneyed fault type. Based on the nonlinear dynamical model of the cracked rotor-bearing system with rub-impact, the stability of the periodic motion and instability way were studied in unbalance-rotating speed plane and rotor/stator clearance- rotating speed plane and crack depth- rotating speed plane, and the main results were validated by the experiment.

转子轴承系统裂纹故障的出现会引起转子系统转静件之间碰摩故障的发生，因此裂纹碰摩耦合故障也是转子系统常见的故障类型，本文在裂纹碰摩耦合故障转子轴承系统的非线性动力学模型基础上，分析了系统在不平衡量-转速、碰摩间隙-转速、裂纹深度-转速等参数域内，周期运动的稳定性及其失稳规律，并用实验验证了主要理论结果。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。