因素

A valve-controlled asymmetric cylinder system has many factors of nonlinearity and uncertainty,whose influence on the stability of the system is complicated.

阀控非对称缸系统存在着大量的非线性和不确定因素，这些因素对系统稳定性的影响非常复杂。

Results Abortion, low birth weight, dystocia, asphyxiation were the main risk factors for cerebral palsy. Driscoll was important risk factor for mixed and athetosis type cerebral palsy.

结果 早产低出生体重、难产窒息缺氧是各型脑瘫的主要患病相关因素；新生儿黄疸是手足徐动型和混合型脑瘫的重要患病相关因素。

To study the effects of factors such as electromagnetic field and electron temperature on the ion extraction characteristics (extraction time, collision loss ratio) in atomic vapor laser isotope separation, 2-D electron-equilibrium model was used to analyze and simulate the ion extraction process.

为研究各因素对原子蒸气激光同位素分离中离子引出特性的影响，采用二维流体理论电子平衡模型分析计算了引出过程中外加恒定电磁场和电子温度等因素对离子引出特性的影响。

Objective:to investigate the cesarean section of the reasons for the bleeding, and lower the rate of obstetric hysterectomy possibility.methods: 30 cases in our hospital cesarean section in the clinical data of patients with hemorrhage were retrospectively analyzed.results: in 30 cases of bleeding, placental factors accounted for 53.33%, 36.67% of the uterine atony, uterine incision bleeding laceration of 6.67%, 3.33% of the amniotic fluid embolism, hysterectomy three cases.conclusion:placenta, uterine atony cesarean section is the main reason for the bleeding.

目的：探讨剖宫产术中大出血的原因及降低产科子宫切除率的可能性。方法：对我院30例剖宫产术中大出血患者的临床资料进行回顾性分析。结果：30例大出血中，胎盘因素占53.33%，宫缩乏力占36.67%，子宫切口裂伤出血占6.67%，羊水栓塞占3.33%。治疗结果中，子宫切除3例，占剖宫产术的0.076%（3/3 935）。结论：胎盘因素、宫缩乏力是剖宫产术中大出血的主要原因。

After that inducts the mainly influence factors of ports attractive force, researching the list of the influence relevancy of all indexes and the result has been qualified and quantified analysis.

随后分析了影响港口吸引力的主要因素，并对影响因素的影响程度进行了关联性排序，定性和定量分析了排序结果。

Methods 134 patients with type 2 diabetes were determined by pure tone audiometry, auditory brainstem responseand distortion product otoacoustic emissions. The risk factors of hearing loss were analyzed by logistic regression analysis. Results 41.8% patients had hearing loss.

测定134例2型糖尿病患者的纯音测听、脑干听觉诱发电位和畸变产物诱发电位结果，回顾性分析听力正常组和异常组的临床资料，并应用多因素logistic回归分析探讨影响听力的危险因素。

According to the model, the author forecast the performance level of science and technology expenditure during the future certain years .

本文在前人研究的基础上结合逻辑模型的思想设计了区域科技支出绩效评价指标体系；收集了2000 年－ 2004 年西安的科技支出绩效统计数据；应用灰色系统理论的分析方法模拟出科技支出绩效模型，根据模型预测了未来若干年西安的科技支出绩效水平；通过灰色关联度与聚类分析，获得了决定区域科技支出绩效的因素；针对这些因素提出了改进区域科技支出绩效的建议。

Literature Research The etiological factors of POF are not still clear. The changes of sites and numbers in X chromatosome, X; autosome translocations, a forkhead transcription factor gene (FOXL2) mutations, FRAXA premutations and inhibits gene mutations are found in POF patients, so genetic disorders have been thought to be involved. Irradiation, chemotherapy or pelvic operations can damage ovaries and cause ovarian atrophy and failure, so it is thought one factor of POF.

一、文献研究 POF的确切病因目前尚不清楚，从POF患者体内检测到X染色体上位点和数目的变化，X染色体与常染色体间的平衡易位，脆性X基因前突变，FOXL2基因突变，抑制素基因突变等，故认为POF发生与遗传因素有关；由于放射、化疗或盆腔手术等可损伤卵巢，导致卵巢萎缩，出现卵巢衰竭，故也是导致POF的因素之一。

In light of different sources of data, three groups of affecting factors, that is, 1 mean annual air temperature; 2 longitude, latitude and elevation; and 3 mean annual air temperature, longitude, latitude and elevation; were designed as auxiliary variable, and the regression kriging method was adopted to predict the spatial patterns of mean annual soil temperatures across the country.

本文用我国698个气象站点的年均土壤温度和年均气温数据以及数字高程模型数据，分析不同气象和地形因素对年均土壤温度的影响；根据全国各地可获取数据源的不同，分别用3组不同的影响因素为辅助变量：(1)年均气温；(2)经度、纬度和海拔；(3)年均气温、经度、纬度和海拔，采用回归克里格法预测我国年均土壤温度空间分布。

Based on the analysis of the mechanism of robot manipulators, a trajectory tracking controlling research model is first built up with ADAMS, and its mathematical model is formulated through the study of robot kinematics and dynamics. After the modeling errors are analyzed in practical robotic systems, a conception of centralized error is brought forward according to the theory of weighting functions. In the case of modeling errors' exist, the robotic uncertain model is derived by introducing an auxiliary control variable into inverse dynamic analysis. The control strategy of robust exponential convergence is applied to the robotic uncertain model, the applicable conditions and the applicable controller with this application are presented. The stable control effect under three main model uncertainties (parametric errors, joint disturbs, joint frictions) are systematically studied on the previously built research model. The problems of robust exponential convergence controller which often results in unstable output and so produces a large relative error when the input trajectory is in a small range are resolved by adjusting the control parameters based on the controller's structure.

本文在机械手的机械结构分析基础上，利用ADAMS建立了用于机械手轨线跟踪控制研究的机械手模型；通过对机器人运动学和动力学问题的研究，建立了机械手研究的数学模型；分析了机器人系统中模型误差的主要来源，根据加权函数法分析，提出了模型集中误差的概念；在存有模型误差的情况下，采用逆动力学结构并引入辅助控制量，由机器人误差模型推导了机器人非确定性模型；提出了采用鲁棒指数收敛法对上述机器人非确定性模型进行鲁棒镇定的控制策略，并给出了对机器人进行鲁棒指数收敛控制时系统不确定因素应满足的匹配条件；针对机械手研究模型，深入研究了鲁棒指数收敛控制器对机器人系统中常见的模型参数误差、关节扰动、关节摩擦等不确定因素的镇定控制效果；针对鲁棒指数收敛控制器易产生控制量振荡的问题以及在小范围内系统轨线跟踪的稳态误差过大问题，本文分别提出了基于控制器结构的控制参数调整法和基于轨线跟踪范围大小的控制参数分段切换法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。