导管架海洋平台结构模糊优化设计

考虑约束条件边界的模糊性,建立了导管架海洋平台结构模糊优化设计模型。对模糊优化模型中的设计变量、目标函数和约束条件进行了模糊处理。针对导管架海洋平台的特点,用模糊优选法确定约束条件边界容差系数,由界限搜索法求解模糊约束集和模糊目标集之交集的最优水平截集*l,进而求得模糊优化问题的最优解。以胜利油田埕北11#井采油平台为例进行了模糊优化设计,并与确定性优化设计相比较,分析了两种优化设计中设计变量的走向及原因,算例结果还显示目标函数值比确定性优化设计值有较大幅度下降,说明考虑模糊因素进行优化设计的可行性和科学性。

改性壳聚糖对处理污泥脱水性能影响的研究

研究了聚合氯化铝、壳聚糖和3种羧甲基壳聚糖(N-羧甲基壳聚糖、N,O-羧甲基壳聚糖和O-羧甲基壳聚糖)絮凝剂对污泥的脱水性能作用。实验结果表明,羧甲基壳聚糖作为絮凝剂对污泥进行脱水时,形成的絮体强度大,不易破碎,对污泥脱水的效果明显好于普通絮凝剂。在3种所研究的羧甲基壳聚糖中,N-羧甲基壳聚糖对污泥的脱水效果最好,污泥比阻抗最低,与未加絮凝剂时相比,含水率从99.1%下降到73%,污泥的体积减少为原来的1/30,热值提高为原来的40倍。

导管架海洋平台优化设计中约束的有效处理

对导管架海洋平台优化设计中的应力约束、桩基横向承载力约束和构件长细比约束进行了分析 ,论证了应力约束取构件截面最大 Mises应力、桩基横向承载力约束取桩顶侧位移或最大抗力比和构件长细比约束取受压构件长细比许用值作为约束的合理性。提出了精细一维搜索算法 ,并用此法求得构件截面 Mises应力最大值。

基于双迭代以截面尺寸拟合薄壁梁几何性质的解法

利用薄壁特点将截面尺寸拟合薄壁梁几何性质的方程组简化，构造且证明了收敛的迭代初始解，时而用准确的非线性方程组构造进一步迭代公式，得到了收敛快而稳的解法。

DTC改性壳聚糖的合成及其对重金属捕集性能的研究

本文对壳聚糖(CTS)进行化学改性,合成了一种重金属捕集剂—二硫代氨基甲酸改性壳聚糖(DTC-CTS)。根据CTS本身的溶解性能,及反应动力学、热力学等特点实验探讨了影响合成DTC-CTS的因素:反应介质、反应物浓度、碱度、温度、时间、反应物的投加速度等,并确定了适宜的合成方法。文章研究了DTC-CTS与未改性的CTS对水溶液中重金属捕集性能的差别。实验表明,与未改性的CTS相比,DTC-CTS捕集重金属的性能更好,可以在更宽的pH范围内使用,捕集重金属的数量更大。可以预见,对于含有重金属的工业废水,DTC-CTS是一种优良的重金属捕集剂。

两种输尿管上段结石手术的疗效安全性和费用比较

目的 比较和分析经尿道输尿管镜钬激光碎石术和后腹腔镜下输尿管切开取石术在处理单纯输尿管上段≥1cm结石时在清石率、并发症和经济效益等方面的差异.方法 收集2018年1月至2019年12月因输尿管结石在本院行微创手术的202例患者的临床数据,其中经尿道输尿管镜钬激光碎石术(A组)143例,后腹腔镜下输尿管切开取石术(B组)59例.比较两组患者在手术时间、高年资医生手术参与率、术后住院时间、并发症、术后1个月结石清除率、平均住院次数、平均手术次数和医疗费用等方面的差异.结果 A组的手术时间明显短于B组(P<0.05);A组的高年资医生手术参与率明显低于B组(P<0.05),A组术后住院天数明显短于B组(P<0.05);A组术后出现了5例感染性休克和3例输尿管狭窄,B组未出现上述并发症;A组术后1个月清石率明显低于B组(P<0.05).A组平均住院次数和平均手术次数均多于B组,整体治疗费用也高于B组.结论 对于单纯输尿管上段较大的结石,后腹腔镜手术虽然难度较大,术后住院时间长,但是手术效果确切,安全性高,经济效益好,具有较高的应用价值.

在工程风险分析中应用Matlab进行蒙特卡罗模拟

蒙特卡罗方法是工程风险分析中一种常用的方法,而产生具有一定分布的随机数是该方法中一个重要的步骤。应用Matlab软件实现该步骤的方法,具有简单、快捷、实用的优点。

糖皮质激素受体信号通路在膀胱癌治疗中的作用研究进展

糖皮质激素受体（GR）是核受体家族中的一员，结合配体后的受体会从细胞质中转位进入细胞核，通过对相关基因转录信号的调控发挥生物学作用。临床上，使用糖皮质激素产生的治疗效果和不良反应几乎都是通过GR信号通路实现的。越来越多的研究表明，GR信号通路与膀胱癌的增殖、侵袭性和预后密切相关，而新一代GR选择性激动剂在提升糖皮质激素抗肿瘤作用的基础上，大大减少了不良反应，有望成为膀胱癌治疗的新方法。

考虑结构-桩-土相互作用的导管架平台优化设计

首先建立了多设计准则、多约束条件的面向结构 -桩 -土相互作用的导管架海洋平台优化设计模型 ,然后给出了此模型与结构分析软件及优化算法软件相结合进行优化设计的方法 ,并以胜利油田埕北 11#井单井采油平台为例进行优化设计。结果显示所建模型既不依赖于优化算法 ,也不依赖于初始设计值 ,目标函数值均收敛于同一极小值且收敛速度较快、减小幅度可观 ,从而说明了此模型的合理性。

基于事件的视频传输自适应调节方法及其应用

在监控视频传输过程中,网络状况及编码参数的改变会影响视频质量与占用的存储资源。在对IP网络视频传输技术研究的基础上,提出了一种基于交通事件的视频传输的自适应调节方法。这种方法在实时监测网络资源状况的同时考虑存储资源,在交通事件发生时提高视频码率和分辨率达到提高视频质量的目的;在没有事件发生期间采用低编码参数,达到节约存储资源的目的。结合一个交通视频通信系统,实现了这种基于事件的自适应调节方法的应用,并进行了实际测试,验证了其运行效果。

海洋平台设计选型的多级模糊优化及非结构性模糊决策分析

针对海洋平台开发设计中经常遇到的复杂的方案优化选型问题 ,提出了将多因素、多级非结构性模糊优选理论引入到平台的设计选型中。根据影响平台选型的非结构性因素 ,采用三级模糊优选 ,综合考虑了影响平台选型的各种优选目标 ;针对影响平台选型优化的因素非常复杂、确定隶属函数主观因素较强的情况 ,引入非结构性模糊决策法以确定其隶属度和权重。通过此模糊优选模型 ,进行了一平台的设计选型优化 ,得到了比较理想的优选结果 ,证明了此模型在为海洋平台方案的设计选型中的实用性。

用薄壁梁截面参数拟合几何性质的有效算法

求解截面参数为变量的拟合性能的非线性方程组时，首先利用薄壁特点和柯西不等式得到较好的近似解，然后迭代计算。

Optimum Design of Structure Shape for Offshore Jacket Platforms

With the introduction of the design variables of nodal coordinates, which reflect the embedded depth of the pile and the jacket bed height, a shape optimum design model for offshore jacket platforms is established. A sequential two-level optimum algorithm is developed based on the design variable gradation. On the basis of the finite element method, the sensitivity of the objective function and nodal displacement is analyzed. As an example, the BZ281 oil storage offshore platform, which ties in the Bohai oil field, is designed with the shape optimum model. The results are compared with the cross-section optimum design. The tendency of design variables and its reasons in the two methods are analyzed. In the shape optimum design, the value of objective function is obviously smaller than that of the initial design and the cross-section optimum design. Therefore, the advantage of structure shape optimum design for jacket platforms is remarkable.

前列腺癌的现代中医药治疗策略探讨

分析近年来前列腺癌的中医药治疗思路,提出前列腺癌分期论治的现代中医药治疗策略。认为在前列腺癌的手术后期、放射治疗期、内分泌治疗期和化学治疗期等不同阶段,中医药干预可分别从改善患者尿失禁、减轻放化疗毒副反应、预防肿瘤复发转移、改善肿瘤相关并发症和提高生活质量等方面入手,提高前列腺癌的治疗效果;并指出当前应用中医药治疗前列腺癌,应慎用破血消癥或毒性较强的中药,以及慎用或不用补肾(阳)中药。

深基坑双排桩支护结构优化设计

建立了多设计准则 ,多约束条件的面向桩 -土相互作用的双排桩支护结构优化设计模型 ,给出了模型与结构分析软件及优化算法软件相结合的优化设计方法。完成了高层建筑深基坑双排桩支护实例的优化设计 ,并分析了桩身刚度、桩的直径和前后排桩距对优化结果的影响 ,算例结果表明 ,本文提出的优化模型应用于双排桩支护结构设计将带来显著的经济效益。

Lectotype Optimization of Offshore Platforms by Use of Three-Scale Fuzzy Analytical Hierarchy Process

A Three-Scale Fuzzy Analytical Hierarchy Process (T-FAHP) is proposed by introducing the Three-Scale Analytical Hierarchy Process (T-AHP) and the trapezoid fuzzy number. A multi-objective optimization model based on the T-FAHP is presented subsequently, in which many factors influencing the lectotype of offshore platform are taken into account synthetically, such as the original investment, the maintenance, cost, the ability of resisting fatigue and corrosion, the construction period, the threat to the environment, and so on. With this method, the experts can give the relatively precise ranking weight of each index and at the same time the requirement of consistence checking can be met, The result of a calculation example shows that the T-FAHP is practical.

Temperature and Stress Analysis of An Experimental Model of Prestressed Lightweight Concrete Platform

This paper presents an experimental study of a prestressed lightweight concrete platform model with a tank and for five steel-columns. This platform can be used not only for extraction but also for storage of oil and is suitable for the Bohai Sea and other shallow seas of China. The platform is subjected to temperature. load, or both. The corresponding temperature distribution. strains, cracks. and vulnerable parts of the platform are analyzed respectively. By use of the finite element method and empirical formulas, the temperature field of the model is analyzed. The results agree with the experimental results, thereby verifying! the reliability of these two calculating methods. The paper provides an experimental basis for the des sign of the bearing capacity and normal service state of prestressed concrete platforms.

Multi-Objective Fuzzy Optimum Design Based on Reliability for Offshore Jacket Platforms

In consideration of the fuzzy constraint boundary and through analysis of structural reliability, a model of structural fuzzy optimum design is established based on reliability for offshore jacket platforms. According to the characteristics of offshore jacket platforms, the tolerance coefficient of the constraint boundary is determined with the fuzzy optimization method. The optimum level cut set lambda*, which is the intersection of the fuzzy constraint set and fuzzy objective set, is determined with the bound search method, and then the fuzzy optimum solution to the fuzzy optimization problem is obtained. The central offshore platform SZ36-1 is designed with the fuzzy optimum model based on reliability; the results are compared with those from deterministic optimum design and fuzzy optimum design. The tendency of design variables in the above three methods and its reasons are analyzed. The results of an example show that the fuzzy optimum design based on reliability is stable and reliable.

Optimum Design of Jacket Platforms Considering Structure-Pile-Soil Interaction

This paper proposes an optimum design model for the offshore jacket platform considering multidesign criteria, multi-design constraints and the structure-pile-soil interaction, and gives an optimum design procedure in which the proposed optimum design model is used together with structural analysis software SAP91 and optimum algorithm software OPB1. The Chengbei (#)11 offshore platform, which lies in the Shengli oilfield, is designed by use of the above optimum design model. The results show that the optimum design model is stable, and it depends on neither the optimization algorithm nor initial values of design variables. All values of the objective function converge to the same minimum value, and the speed of convergence is high, showing that the proposed optimum design model is reasonable.

改性壳聚糖对处理污泥脱水性能影响的研究

研究了聚合氯化铝、壳聚糖和3种羧甲基壳聚糖（N-羧甲基壳聚糖、N，O-羧甲基壳聚糖和O-羧甲基壳聚糖）絮凝剂对污泥的脱水性能作用．实验结果表明．羧甲基壳聚糖作为絮凝剂对污泥进行脱水时．形成的絮体强度大．不易破碎．对污泥脱水的效果明显好于普通絮凝剂．在3种所研究的羧甲基壳聚糖中．