金属化球团工艺系统还原风机转子失衡故障分析与风机现场动平衡技术的应用

本文主要介绍了金属化球团工艺系统还原风机的工况,分析了该工艺下还原风机转子失衡故障的主要原因,提出了预防还原风机转子失衡振动故障的方案,并对风机现场动平衡技术应用进行了介绍。

复方丹参滴丸治疗冠心病的疗效与运动平板实验分析

目的:观察复方丹参滴丸治疗冠心病心绞痛的效果。方法:选择冠心病稳定型心绞痛70例,应用复方丹参滴丸治疗,检测运动平板实验、常规心电图、血脂、血流变。结果:6周后心绞痛总有效率达91.4%,心电图改善总有效率71.14%,运动平板实验治疗前、后比较(P<0.01)。结论:用复方丹参滴丸治疗冠心病稳定型心绞痛疗效确切、安全、速效,无副作用。

轨道平直度对动车组动态称重设备误差影响探讨

本文就轨道的不平直度对动车组动态称重设备造成的不良影响进行了分析,从水平高度差、空气弹簧调节高度阀、纵向力和制动力几个方面诠释该设备对检测区及周边轨道平直度要求很高的原因。

名老中医张磊“动、和、平”学术思想的临床运用

张磊老师是全国名老中医之一,在河南中医界属于泰斗级名老中医。他不仅学术精深,医德高尚,对书法旧体诗也颇有研究,临证中善用经方,但又不拘于经方。他集六十余年的临床经验,结合现代疾病的发病特点,总结出临证八法,

张磊以“动、和、平”学术思想治疗眩晕经验介绍

国医大师张磊教授在长期的教学和临床工作中,积累了丰富的经验,形成了独特的“动、和、平”学术思想,该思想不但能指导临床疾病的诊治,还是一种哲学思想的体现,是对中医学整体观的升华。“动、和、平”学术思想是在整体运动发展观的辨证下治疗疾病,即和态失常的疾病发生观、病证变化的动态观、动态的平和辨治观、动态的求本治本观。在治疗眩晕类疾病时,需注重辨证,辨清静态之证与动态之证;要树立大学科观,不能只看眩晕,而不看头晕甚至头昏。临证时用心审病查因,不惑于万千幻象,诊治思路和用药需灵活,遣方用药精准,配伍得当,通过药物功用动静对立的特点,纠正病势之偏颇,引风归元,沉烽静柝,从而使机体恢复阴平阳秘,眩晕可止。

平头式动臂屋面起重机起重臂设计方法

研究了平头式动臂屋面起重机起重臂截面参数的确定方法,根据起重臂水平状态下工作时的受力状态特点得到各节上下弦杆应力计算表达式,以各节起重臂受力状态基本一致为原则设定各节起重臂根部应力值。再使各节起重臂根部设定的应力值与起重臂仰起状态的整体稳定性等效应力值基本相等,得出合理的起重臂截面尺寸,应用MATLAB软件对起重臂截面尺寸关系进行实例分析,为平头式动臂屋面起重机及类似塔机起重臂截面尺寸设计提供新的方法。

平肝调肺止动汤治疗小儿多发性抽动症40例疗效观察

目的:观察平肝调肺止动汤治疗小儿多发性抽动症的临床疗效及安全性。方法:选取2016年9月-2017年8月洛阳市第二中医院脑病门诊收治的小儿多发性抽动症患者40例作为研究对象,给予平肝调肺止动汤治疗,30d为1疗程,共治疗3个疗程,观察临床疗效。结果:临床总有效率达92.5%(37/40)。结论:平肝调肺止动汤治疗小儿多发性抽动症疗效显著,且副作用小,安全性高,远期疗效稳定。

一种车载平台随动自调平系统设计

本文介绍了一种应用于在某型光电搜索仪随载车行进过程中适应外界不规则地形提升探测精度的平台随动自调平系统,系统以自动控制理论为引导,在硬件模块中加入PID算法,经样机调试与外场试验后,将工作平台的随动调平时间缩减至2min,随动调平精度提升至±0.1°,成功应用于地下管线、孔洞与雪面冰层厚度检测的光电物探过程中。

潜基导弹动基座瞄准技术

系统分析和论述了国内外采用和正在研究的先进动基座瞄准技术,包括动基座调平、光电瞄准、传递对准、自主对准等多种对准方法在动基座中应用的原理,论述采用不同方式完成初始方位对准后平台系统变射向的方法,为进一步减小初始对准误差对导弹落点精度的影响,提出惯性/星光制导方案及在动基座潜基弹道导弹中的工作流程和工作方法。

基于小波消噪的EMD模型在GPS振动信号处理中的应用

经验模式分解和小波分解是当前有效处理非平稳信号的两种时频分析方法,它们各具有其优缺点,适用于不同的应用。从对GPS振动信号的预处理、时域和频域处理入手,结果分析表明,对GPS振动信号先进行小波滤波消除随机噪声的干扰,再应用经验模式分解更有利于变形特征信息的分离和提取,提取的信号与振动平台记录数据更加吻合。

Kalman Fliter Approach to Multisensor Registration of Moving Platform

Aim To find an effective method to remove the registration error in multi-sensor systems. Methods A Kalman filtering technique was proposed to estimate and remove sensor bias and sensor fare tilt errors in multisensor systems with a moving platform. Results Simulation results are presented to demonstrate the performance of the approach. Conclusion The Kalman filter algorithm am detect registration errors and use this information to converge tracks from independent sensors. This is particularly important if the data from the sensors are to fused.

Equilibrium Control Theory and Direct Method of Feedback Linearization for Nonlinear Time Varying Systems

Aim To present a simple and effective method for the design of nonlinear and time varying control system. Methods A new concept of dynamic equilibrium of a system and its stability were presented first. It was pointed out that what is controlled directly by the input of a control system is the system's dynamic equilibrium rather than the states. Based on it, a new feedback linearization method for nonlinear system based on the Lyapunov direct method was given. Simulation studies were also carried out. Results The example and simulation show that by use of the method, the controller design becomes very simple and the control effect is quite satisfying. Conclusion The new method unifies the stabilizing problem(regulating problem) with the tracking problem. It is a very simple and effective method for the design of nonlinear and time varying control system.

Competitive Strategies of Two Species of Co-occuring Tadpoles

We examined the competitive ability of larval toads （Bufo gargarizans ） and frogs （Rana kukunoris ） which co-occur in natural pools in the Jiuzhaigou Nature Reserve. We measured the activity level, growth rate, mass at metamorphosis and larval period in a laboratory experiment. Tadpoles of B. gargarizans were significantly more active when food was abundant than scarce, while there was no significant difference in the activity of R. kukunoris tadpoles at different food levels. At low food availability, mass at metamorphosis and growth rate of R. kukunoris were significantly increased in the presence of B. gargarizans, whereas the presence of R. kukunoris had no significant effect on the mass and growth rate of B. gargarizans. In all treatments, the larval period of B. gargarizans at low food availability was the shortest. These results suggest that B. gargarizans can adapt to different food levels by changing their activity rate. At high food level, B. gargarizans increased activity to gain more food. At low food level, B. gargarizans decreased activity and achieved early metamorphosis. However, when food resources were limited, R. kukunoris could gain more food than B.gargarizans .

Driving Analysis on Ecological Security in Vulnerable Transition Areas of Mountain and Plain

[Objective] This study aimed to investigate the driving mechanism of eco- logical security in vulnerable areas in mountain and plain. [Method] The ecological security evaluation index system of Lincheng County was established using PSR model. Driving mechanism was analyzed in total system and subsystems respectively by the principal components. The ecological safety driving factor was calculated through the total system and subsystem respectively. And the intersection was adopt- ed as dominant driving factor. [Result] A total of 10 indices including density index of rivers, land degradation index, farmland drought and flood insurance yield, human in- terference index, population density, the natural population growth rate, per capita GDP, the R＆D funds spending accounts for the proportion of GDP, laborer by edu- cation degree and three industry accounted for the proportion of GDP, are the domi- nant driving factors of the regional ecological security. [Conclusion] This study will pro- vide reasonable and feasible advice for the benign development of the area.

Identification and Balancing of Flexible Rotors by Boundary Element Method

In this paper, an identification method to estimate the unbalances is introduced, which is based on the boundary element method (BEM). By using the vibration response measured at some points on the flexible rotor the unbalances can be identified conveniently. Therefore, the rotor can be balanced without test runs.

A Into-Plane Rotating Micromirror Actuated by a Hybrid Electrostatic Driving Structure

A novel into-plane rotating rnicromirror actuated by a hybrid electrostatic driving structure is presented. The hybrid driving structure is made up of a planar plate drive and a vertical comb drive. The device is fabricated in SOI substrate by using a bulk-and-surface mixed silicon micromachining process. As demonstrated by experiment, the novel driving structure can actuate the mirror to achieve large-range continuous rotation as well as spontaneous 90°rotation induced by the pull-in effect. The continuous rotating range of the micromirror is increased to about 46° at an increased yielding voltage. The measured yielding voltages of the mirrors with torsional springs of 1 and 0.5μm in thickness are 390 - 410V and 140 - 160V, respectively. The optical insertion loss has also been measured to be --1.98dB when the mirror serves as an optical switch.

Analysis of the Groundwater System Change and Driving Factors in Songnen Plain in Jilin Province

[Objective] The aim was to provide theoretical basis for the study of underground water dynamic changes in Songnen Plain in Jilin Province.[Method] The dynamic changes and driving factors for the underground water in Songnen Plain in Jilin Province was expounded.[Result] Since 1960s,the temperature in the Songnen Plain in Jilin Province increased gradually.The average temperature increased 2℃;precipitation reduced gradually.Especially,the trend of precipitation reduction in west area was more distinct;in the meantime,the development of underground water augmented gradually and reached 2 800 million m3 in 2008.Driven by many factors,regional underground water level had distinct changes.Potential water position reduced greatly in northwest fan-shaped area.The one in other places were stable and even increased in certain parts;confined water position decreased quickly in general and it increased in certain parts.[Conclusion] The general deterioration trend of underground water environment was inevitable.But,the deterioration process can be eased through scientific planning and regional underground water resources so as to realize sustainable utilization of regional underground water resources.

Inhibitory Effects of Sodium Ferulate on Proliferation of Rabbit Aortic Smooth Muscle Cells Induced by Oxidized LDL

The effects of sodium ferulate(SF), a water-soluble element of Chinese medicine Angelica sinensis diels, on cell-mediated oxidative modification of human low density lipoprotein(LDL) and proliferation of rabbit aortic smooth muscle cells(SMCs) were investigated. Using experimental models of proliferation of cultured rabbit aortic SMCs induced by oxidized LDL(ox-LDL), the extent of oxidation was determined by thiobarbituric acid reactive substances(TBARS) method, MTT colorimetry and 3H-thymidine(3H-TdR) incorporation were used to observe proliferation of SMCs. It showed that SF effectively inhibited cell-mediated oxidation induced by Cu2+ in a concentration-dependent manner. At the final concentration of 40, 80, 120 gmL-1, SF could significantly inhibit 3H-TdR incorporation and cell Proliferation in a dose-dependent manner. The results indicated that SF could, in vitro protect LDL against oxidative modification and inhibit the proliferation of SMC, which might be due to its free radical scavenging capacity.

Resource allocation based on fairness and QoS provisioning for OFDMA-WLAN system

To satisfy different service requirements of multiple users in the orthogo nal frequency division multiple access wireless local area network OFDMA-WLAN system downlink transmission a resource allocation algorithm based on fairness and quality of service QoS provisioning is proposed. Different QoS requirements are converted into different rate requirements to calculate the QoSs atisfaction level.The optimization object is revised as a fairness-driven resource optimization function to provide fairness. The complex resource allocation problem is divided into channel allocation and power assignment sub-problems. The sub-problems are solved by the bipartite graph matching and water-filling based method.Compared with other algorithms the proposed algorithm sacrifices less data rate for higher fairnes and QoS satisfaction.The sim ulation results show that the proposed algorithm is capableo fp rovi ding QoS and fairness and performs better in a tradeoff among QoS fairness and data rate.

PYRAMIDAL MULTIPHASE LEVEL SET FRAMEWORK FOR BRAIN TUMOR DETECTION USING GENERALIZED TECHNIQUE OF PAINTING BACKGROUND

The pyramidal multiphase level set framework （PMLSF） based on the technique of painting background （TPBG） and the Chan-Vese model can detect multiple objects on a given image. However, the boundaries of the sub-object obtained by PMLSF-TPBG are not variable since a specialcolor parameter is used in TPBG. To solve the problem, a new technique utilizing a varying parameter is proposed to ensure that PMLSF is effective for the detection of the desired boundaries of the sub-object. The interval of the variable color parameter is proved and the effects of the parameter are also discussed. Experimental results for the brain tumor detection show that different boundaries of the brain tumors can be detected with different color parameters. It is especially useful for clinical diagnoses.