Limit equilibrium method(LEM) of slope stability and calculation of comprehensive factor of safety with double strength-reduction technique

When the slope is in critical limit equilibrium(LE) state, the strength parameters have different contribution to each other on maintaining slope stability. That is to say that the strength parameters are not simultaneously reduced. Hence, the LE stress method is established to analyze the slope stability by employing the double strengthreduction(DSR) technique in this work. For calculation model of slope stability under the DSR technique, the general nonlinear Mohr–Coulomb(M–C) criterion is used to describe the shear failure of slope. Meanwhile, the average and polar diameter methods via the DSR technique are both adopted to calculate the comprehensive factor of safety(FOS) of slope. To extend the application of the polar diameter method, the original method is improved in the proposed method. After comparison and analysis on some slope examples, the proposed method's feasibility is verified. Thereafter, the stability charts of slope suitable for engineering application are drawn. Moreover, the studies show that:(1) the average method yields similar results as that of the polardiameter method;(2) compared with the traditional uniform strength-reduction(USR) technique, the slope stability obtained using the DSR techniquetends to be more unsafe; and(3) for a slope in the critical LE state, the strength parameter φ, i.e., internal friction angle, has greater contribution on the slope stability than the strength parameters c, i.e., cohesion.

The W-11-4A Platform Comprehensive Strength Monitoring System

A comprehensive strength monitoring system used on a fixed jacket platform is presented in this paper. The long-term monitoring of W-11-4A platform achieved. Structural responses (strain and acceleration) at selected locations, as well as associated environmental parameters, have been obtained. The emphasis of the paper is placed on the system design, and the instrumentation and operation methodology employed in the monitoring of the structural responses. The performance of the system and the characteristic results obtained during its 13-month operation are also summarized.

Risk assessment of corroded casing based on analytic hierarchy process and fuzzy comprehensive evaluation

Casing corrosion during CO2 injection or storage results in significant economic loss and increased production risks.Therefore,in this paper,a corroded casing risk assessment model based on analytic hierarchy process and fuzzy comprehensive evaluation is established to identify potential risks in time.First,the corrosion rate and residual strength characteristics are analyzed through corrosion tests and numerical simulations,respectively,to determine the risk factors that may lead to an accident.Then,an index system for corroded casing risk evaluation is established based on six important factors:temperature,CO2 partial pressure,flow velocity,corrosion radius,corrosion depth and wellhead pressure.Subsequently,the index weights are calculated via the analytic hierarchy process.Finally,the risk level of corroded casing is obtained via the fuzzy comprehensive evaluation.The corroded casing risk assessment model has been verified by a case well,which shows that the model is valuable and feasible.It provides an effective decision-making method for the risk evaluation of corroded casing in CO2 injection well,which is conductive to improve the wellbore operation efficiency.

Strength Design Method for Tubing Hanger of Subsea Christmas Tree Against Big Temperature Difference

The tubing hanger is an important component of the subsea Christmas tree, experiencing big temperature difference which will lead to very high thermal stresses. On the basis of API 17D/ISO 13628-4 and ASME VIII-1, and by comprehensively considering the erosion of oil and the gravity load of the tubing, a calculation model is established by regarding design pressure and thermal stress, and the method for designing the tubing hanger of the horizontal Christmas tree under big temperature difference condition is developed from the fourth strength theory. The proposed theory for strength design of the tubing hanger in big temperature difference is verified by numerical results from ABAQUS.

《公共应急管理》的SWOT分析及其靶向综合施策

为满足新时代对应急人才的需求,解决《公共应急管理》课程教学实践中主要痛点,运用态势(SWOT)分析方法,深入剖析公共应急管理的发展趋势和所面临的挑战,多维度融合典型案例优化教学内容,激发学生学习兴趣,启迪学生思维;提出在互联网+时代背景下的教学创新,实现智能手机从“干扰”课堂到“助力”创新课堂的转变;课程创新引入超级辩论赛,突破传统知识传授的局限,强化问题导向、课堂翻转和主动参与;同时,融入基于Pathfinder软件的疏散模拟和基于ALOHA的危化品泄漏模拟仿真技术,提高课程难度和挑战度,推动高阶学习。结果表明:对于该课程的靶向综合施策教学创新,能够有效激发学生的学习热情,提升学生的自主学习能力,培养学生通过现代工具解决复杂应急工程问题的能力。

基于I-TOPSIS法的河南省市域经济综合实力评价

基于河南省17个地市2015年的数据,运用I-TOPSIS法从经济规模、经济结构、开放程度、城市建设、人民生活质量5个方面,构建市域经济综合实力评价指标体系,得出河南省各地级市经济综合实力排序,通过分析指出河南省经济发展存在的问题,并提出相应的建议。

基于熵权TOPSIS模型的中国海洋综合实力评价

海洋强国战略目标的实现需以海洋综合实力的整体提升为基础。运用熵权TOPSIS模型,根据中国海洋经济及相关统计数据对海洋综合实力及其动态变异规律进行分析评价。结果显示,2001—2016年中国海洋综合实力呈上升趋势,且具有阶段性特征,但要素层七大子系统对海洋综合实力提升的传递作用具有异质性。为此,需从以下方面提升中国海洋综合实力:完善海洋科技发展体制机制,提升海洋经济发展质量与效益;改善海洋基础设施效能,提高海洋产品与服务的消费市场与国际竞争力;在合理利用现有海洋资源基础上进一步开发海洋新资源,提高海洋生态保护能力。

基于熵权—TOPSIS和DEA算法的港口综合实力评价及作业效率研究

现代港口对推动一国经济发展具有重要影响,随着港口规模不断扩大,港口之间的竞争日益加剧,如何促进港口可持续健康发展成为各国关注的焦点.在此背景下,该文以上海港和宁波舟山港等几个主要沿海港口为例,根据港口实际发展情况建立了涵盖港口运营规模在内的六方面港口竞争力评价指标体系,利用熵权-TOPSIS对港口竞争力进行深入的实证分析,并使用DEA算法对当前港口发展进行作业效率分析,得出各港口综合实力参差不齐,但总体向前发展,与各大港口实际发展现状相符;最后运用定性与定量分析法,对实证分析中各大港口发展中存在的问题,提出了具有针对性的发展意见.

基于TOPSIS-RSR法的高水平女排比赛攻防综合实力评价研究

运用TOPSIS和RSR法以及文献资料、数理统计、录像观察等研究方法,对参加2015年世界杯赛的12支中外女子排球队的攻防综合实力进行比较分析和排序、分档。结果表明:在2015年第12届女排世界杯赛中,最终取得较好名次和成绩的球队其攻、防实力均较强,且攻防综合实力也明显优于其他队伍;中国女排是一支攻强守弱的队伍,进攻实力突出但防守实力仅处于中等水平,攻防综合实力仍有较大的提升空间;2015年女排世界杯赛的竞争格局可分为五个档次,中国女排的攻防综合实力较强,排在第五位并处于第二档次水平,与塞尔维亚、美国等第一档次强队相比还存在一定的差距。研究认为,利用TOPSIS法和RSR法对高水平女排比赛的攻防实力进行综合评价及档次划分、排序具有一定的可靠性和参考价值,适合在球队综合实力评价中得到进一步推广及应用。

Preparation of montmorillonite modif ied phenolic resin for shell process

The development of montmorillonite modified phenolic resin under microwave irradiation heating was investigated.The effect of montmorillonite content and stirring time on the structure and morphology of synthetic resin was analyzed.The optimum processing procedure was found to be 45 min stirring time with 5.4% montmorillonite addition.Further,the platelet spacing increases with stirring time till montmorillonite exfoliated to nanoscales platelet.When montmorillonite is exfoliated,layered structure at nanoscale can be uniformly distributed in the resin.The overall performance of montmorillonite modi fied phenolic resin is improved remarkably,such as flow ability,tensile strength and toughness property of resin coated sand.However,the gelation speed decreased slightly by adding montmorillonite.

Spheres of Urban Influence and Factors in Beijing-Tianjin-Hebei Metropolitan Region Based on Viewpoint of Administrative Division Adjustment

The coordinated development of Beijing, Tianjin and Hebei has been elevated as China's important strategy. And, the priority in considering how to bring the maximum effect of their coordinated development into play is to delineate the spheres of urban influence with regard to the cities in the Beijing-Tianjin-Hebei Metropolitan Region. By building an evaluation index system of urban comprehensive strength, this paper applies the principal component analysis method to determine centrality strength of the cities, and the breakpoint theory and weighted Voronoi diagram to identify the spheres of urban influence in all central cities of the region. Results show that 13 central cities within the region greatly differ in strength, which can be classified into four tiers and that the spheres of urban influence do not have a high goodness of fit with administrative jurisdiction scope. Cities like Beijing, Tianjin, Shijiazhuang and Handan have larger spheres of urban, spheres of urban influence in Tangshan and Qinhuangdao are basically consistent with their administrative jurisdiction scopes, and seven cities including Langfang and Baoding have smaller spheres of urban influence. So according to these cities' comprehensive strength and spheres of influence, the region can be divided into five plates: Beijing, Tianjin, Shijiazhuang, Tangshan and Handan. The major influence factors for inconsistency between spheres of urban influence and spheres of jurisdiction include difference in urban administrative ranking, small number of central cities with weak strength, discrepancy in the number of counties under jurisdiction, unreasonable spheres of jurisdiction and diversity in topographical conditions. In order to solve the imbalance in the spheres of urban influence and those of jurisdiction and better facilitate the coordinated development of the region, it is advised to adjust administrative areas so as to obtain more optimized urban spatial layout and more reasonable urban scale hierarchy system.

Early-age Hydration Characteristics of Composite Binder Containing Graphite Powder

The early-age hydration characteristics of composite binder containing graphite powder(GP)with two different finenesses were investigated by determining the hydration heat,thermo gravimetric,morphology of hardened paste as well as the compressive strength of mortar.The experimental results show that:replacing 2%-6%of cement with graphite powder significantly improves the piezoresistive effect of early age mortar,can be used to monitor accidental loads caused by dropped objects,collisions,or other accident events,and thus avoids initial damage.Some GP provides additional nucleation sites that lead to a fast formation of hydration products(nucleation-site effect).However,due to the almost hydrophobic water contact angle,most of the GP causes a large number of micro-cracks in the hydrated paste(gap effect).Because of the lamellar shape and high surface energy,GP is easily balled and can not be uniformly distributed in the composite,resulting in clumping together and wrapping some of the cement particles(barrier effect).Due to nucleation-site effect,when the dosages of coarse and fine GP reached 2%and 4%,1 d strength were increased by 9.1%and 9.6%,respectively.At 3 days,as the interior damage caused by the gap effect gradually increased,and the retarding effect on cement hydration caused by barrier effect was enhanced.GP has an obvious negative effect on compressive strength.However,micro-cracks caused by fine GP are less,so its negative effect on 3 d compressive strength is lower.

基于AHP-EWM-TOPSIS模型的中国包装企业品牌价值评价

品牌价值是品牌管理要素中最核心的部分,也是体现同类竞争品牌差异的重要标志。品牌价值的评价可以反映各企业品牌培育情况,以便企业更好地合理配置资源,提高品牌影响力。针对品牌评价各级指标权重的优选和品牌强度的确定,建立了品牌价值AHP-EWM-TOPSIS评价模型。AHP-EWM确定综合权重以实现主观判断和客观数据相结合,TOPSIS计算品牌强度指数以实现企业品牌价值的综合排名。并选取25家包装上市企业在2018—2019年的相关数据进行实证分析,验证了模型的有效性和可行性。

基于TOPSIS-RSR法的女子足球世界杯8强球队的攻防能力评价

目的探究第八届女子足球世界杯前8强球队的攻防特点和实力格局分布,为提高女子足球技战术水平提供借鉴。方法主要运用文献资料法、TOPSIS法和RSR法等研究方法,对第八届女子足球世界杯前8名球队在比赛中的攻防技术指标进行分析。结果1)在进攻能力上,美国女足、法国女足和德国女足的进攻Ci>0.5152,属于进攻较强的球队;在防守能力上,荷兰女足、瑞典女足和意大利女足的防守Ci>0.5206,属于防守能力较强的球队。2)在攻防综合实力方面,攻防RSR>0.591,属第1档球队;攻防RSR值在0.478~0.591之间,属于第2档球队;攻防RSR<0.478,属第3档球队。3)8支队伍的攻防能力排序和分档与比赛排名基本一致。结论通过TOPSIS法和RSR法相结合,能较好地反映8强球队的进攻能力、防守能力和攻防综合能力。结合最佳分档原则,经反复验证,8支球队攻防实力排序和档次划分较为合理,共划分为3个档次。

地铁齿轮的C-P-S-N曲线研究及其可靠性分析

在对齿轮进行寿命设计与可靠性分析时,了解齿轮的强度和寿命分布极为重要。为此,以弯曲疲劳、接触疲劳实验数据为基础,对某地铁齿轮的C-P-S-N曲线进行了研究,对其可靠性进行了分析。首先,针对P-S-N曲线的失真,提出了一种利用拟合材料参数的修正方法,分别计算了齿轮不同置信度下的接触和弯曲C-P-S-N曲线;然后,以置信度为95%的C-P-S-N曲线为基准,得出了郑州某地铁齿轮箱在不同工况下的疲劳寿命分布参数,并分析了其寿命离散度规律;最后,运用顺序可靠度理论,对齿轮多工况下的综合可靠度进行了评判。研究结果表明:与其他方法相比,采用拟合材料参数的方法得到的疲劳强度差异最大为0.48%,与采用其他方法所得结果具有相同的参考性;随着置信度的增加,齿轮疲劳强度的离散度也随之增加;弯曲疲劳强度的变异系数约为0.096,接触疲劳强度的变异系数约为0.062,且接触疲劳寿命的可靠度小于弯曲疲劳寿命,即小齿轮更容易发生接触疲劳破坏;当地铁运行里程达到1.36×10^(7)km时,不发生接触疲劳破坏的概率约为0.989。

基于熵权-WRSR法的高水平女排比赛攻防综合实力评价研究

为认识和把握湖南省大学生高水平女排的攻防综合实力及实力格局分布,运用熵权-WRSR法以及文献资料、数理统计、录像观察等研究方法,对2022年湖南省第十二届大学生运动会大学组5支女子排球队进行分析.结果表明:进攻实力湖南师范大学WRSR值最高;防守实力中南大学WRSR值最高;攻防综合实力中南大学WRSR值最高.进攻WRSR值(r=0.942,P<0.05)与最终排名呈显著相关;防守(r=0.309,P>0.05)和攻防(r=0.832,P>0.05)WRSR值与最终排名呈不显著相关.实力格局分布上,进攻方面中南大学和湖南师范大学排在一档水平,湖南工业大学和中南林业大学排在二档水平,南华大学在三档水平;防守方面中南大学排在一档水平,湖南师范大学、湖南工业大学、中南林业大学和南华大学排在二档水平;攻防方面中南大学排在一档水平,湖南师范大学、湖南工业大学、中南林业大学和南华大学排在二档水平.

基于熵权和TOPSIS法研究宁波舟山港口综合发展

随着港口规模的不断扩大,港口发展对推动我国经济具有重要影响,港口之间的相互竞争日益加剧,如何使港口可持续稳定发展成为各国关注的焦点。以此为背景,本文以上海港和宁波-舟山港等几个主要沿海港口为研究对象,根据港口发展的实际情况建立了涵盖港口自然条件和管理水平在内的五大方面港口综合发展评价指标体系,利用熵权、TOPSIS法对港口综合发展进行深入透彻的实证分析。简单分析各大港口发展中存在的优势与问题,并针对宁波-舟山港提出了实质性的发展建议。

中国共产党人团结奋斗精神的基本内涵与弘扬路径

中国共产党的历史就是一部波澜壮阔的百年团结奋斗史,团结奋斗精神是中国共产党和中国人民最显著的精神标识。中国共产党人团结奋斗精神具有丰富深邃的内涵,主要体现为善于团结、敢于斗争的自主自觉,勇挑重任、谋求复兴的使命担当,自强不息、守望相助的爱国情怀,天下大同、共同富裕的理想追求。团结奋斗精神从四重逻辑上构成了一个主体有力、主题突出、主线清晰、主旨鲜明的精神体系,深刻解答了团结奋斗精神“由何而生、以何而成、因何而立、向何而去”的重要问题。新时代弘扬中国共产党人团结奋斗精神应以党为舵、以史为鉴、以人为镜、以媒为介,为走好中国式现代化道路、实现中华民族伟大复兴中国梦汇聚同心同德、同向同行的精神动力和实践伟力。

中国南北方植物对土壤加固机制的差异性

为深入分析植物对土壤加固的影响效益和机制,该研究选取重庆缙云山地区和陕西延安黄土丘陵区种植一年的乔木(火炬树、榆树)和灌木(荆条、酸枣),测定其根系形态、力学参数和土壤的抗剪强度,通过RBMw模型计算根系固土效益,综合评估不同植物的固土效能和贡献度。结果表明:2地种植的物种平均根直径的差异不显著(P>0.05),重庆种植的乔木(火炬树、榆树)的根长、分叉数和根尖数显著高于延安,灌木未出现显著差异(P<0.05)。根系的抗拉强度与直径都符合负幂函数关系,其中平均抗拉强度最大的为荆条。除荆条外,同种植物根系的抗拉强度并未因不同地区的种植产生显著差异。4个植物种根系的固土效率为0.65~4.12 kPa,各物种间存在显著差异(P<0.05)。重庆2种乔木种植下的根土复合体有效黏聚力高于裸地(约10%),灌木种植下则普遍略低于裸地。除酸枣外,种植于重庆的4种植物的根系固土作用和效率都显著的高于延安(P<0.05)。研究结果可为不同地区固土护坡的树种选择提供理论依据。

以障碍点为指导的个性化综合训练对老年全髋关节置换伴肌少症患者运动能力及预后的影响

目的 探讨以障碍点为指导的个性化综合训练用于老年全髋关节置换伴肌少症围术期的康复效果。方法 选取2020年2月—2023年4月收治的84例老年全髋关节置换伴肌少症,根据康复训练方法不同分为对照组、观察组,各42例。对照组给予常规康复训练,观察组给予以障碍点为指导的个性化综合训练。比较2组术前及术后1个月Fugl-Meyer运动功能量表(FMA)、Berg平衡量表(BBS)、髋关节残疾和骨关节炎预后评分(HOOS)、肌力相关指标、肌肉相关康复指标及肺功能[用力肺活量(FVC)、第1秒用力呼气容积(FEV1)、FEV1/FVC、FEV1占预计值的百分比(FEV1%pred)]。结果 术后1个月,观察组FMA、BBS、HOOS评分较对照组升高,优势手握力、四肢骨骼肌质量、患肢骨骼肌质量和全身肌肉质量均较对照组升高,胫前屈肌厚度、肱二头肌厚度较对照组均降低(P<0.05);术后1个月,观察组FVC、FEV1、FEV1/FVC、FEV1%pred与对照组比较均升高(P<0.05)。结论 以障碍点为指导的个性化综合训练能提高老年全髋关节置换伴肌少症患者肌力与运动能力,利于改善肺功能及患者预后。