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.

测算高校R&D综合实力的二次相对评价方法

对于提高高校 R&D综合实力有效努力程度的评估比对高校 R&D综合实力本身的评估更为重要 .本文提供了可以消除各高校客观条件的影响 ,能够真正体现高校在提高 R&D综合实力主观努力程度的二次相对评价方法 .

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.

综合性护理干预对脑卒中偏瘫患者Barthel指数和肌力的影响

目的：探讨综合护理干预对脑卒中偏瘫患者Barthel指数和肌力的影响。方法：选取2012年4月～2014年3月我院收治的脑卒中偏瘫患者136例作为研究对象，实施综合护理干预，观察患者干预前后Barthel指数、肌力及生存质量情况。结果：干预6周后Barthel指数明显高于干预前（P〈0．05）；干预6周后患者上、下肌力恢复效果明显高于干预前（P〈0．05）；干预6周后生存质量评分明显高干预前（P〈0．05）。结论：综合护理干预可有效提高脑卒中偏瘫患者Barthel指数、肌力，并能有效提高患者生存质量。

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.

PDCA循环管理模式用于检验科仪器设备管理的效果评估

目的评估PDCA循环管理模式用于检验科仪器设备管理的效果。方法选取2021年7月—2022年6月长沙市第一医院检验科工作人员25名作为研究对象,2021年7—12月开展常规仪器设备管理,作为常规组;2022年1—6月开展PDCA循环管理模式,作为实践组。分析管理后两组工作人员综合实力、仪器设备无损率、仪器设备每月维修情况、管理满意率的差异性。结果管理后,实践组工作人员综合实力高于常规组,差异有统计学意义(P<0.05);实践组仪器设备无损率高于常规组,差异有统计学意义(P<0.05);实践组仪器设备每月维修率低于常规组,差异有统计学意义(P<0.05);实践组管理满意率高于常规组,差异有统计学意义(P<0.05)。结论在为检验科仪器设备管理时,运用PDCA循环管理模式能够增强工作人员综合实力,提升仪器设备无损率,减少仪器设备每月维修情况,提高管理满意率。

基于MDI法的化工生产碳排放强度计算方法

为使用主观、客观相结合的评价指标,准确判断化工生产碳排放强度,提出基于MDI法的化工生产碳排放强度计算方法。此方法在构建化工生产碳排放强度评价指标体系之后,由基于MDI法的碳排放强度评价指标综合赋权方法,完成碳排放强度评价指标综合赋权,以此便可把评价指标效用值转换为综合值;将综合赋权后指标输入基于改进BP神经网络的碳排放强度计算模型,由蚁群算法寻优可保证BP神经网络训练误差最小化的连接权重后,使用训练完毕的BP神经网络,以碳排放强度分级的方式,计算化工生产碳排放强度。经验证,此方法能够使用主观、客观相结合的评价指标,高精度计算化工生产碳排放强度。

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。

权力与价值的博弈:国际传播战略模型研究

在国际交往日益频繁、国际竞争持续深入的当下,国际传播成为各国取得竞争优势的重要一极。与传统意义上以大众媒介为主要场域不同,广义国际传播包括主体和对象之间一切因为互动引发的信息交换行为,深刻作用于参与者的国际权力地位和文明影响能力。因此,国际传播战略制定的意义重大,必须反映国际竞争的全局性、系统性和长期性。基于此,从现实主义和建构主义出发,将国家综合实力与广义文化近似程度确定为国际传播战略模型(受众矩阵)的横纵坐标,从而区隔出四个象限,各自衍生出一种国际传播战略。首先是综合实力强、广义文化相近的“同源与责任战略”,强调和突出国际传播主体与对象同文同种的“自我认同”,渲染强大前者在同文化圈领导或核心的负责任国家形象;其次是综合实力强、广义文化相异的“标杆与说服战略”,即文化相异、综合实力较强的国际传播主体应努力跨越文化鸿沟,示范和说服国际传播对象明确认识和接受这一事实并开展建设性交流和实质性合作;再次是综合实力弱、广义文化相近的“共情与跟随战略”,也就是在“同文化、弱实力”比较条件下,主体通过国际传播强调双方广义文化近似程度并清晰表达“跟随”战略意图,引发受众共情效应,从而最大化保护国家安全和其他重要利益;最后是综合实力弱、广义文化相异的“互利与展演战略”,即以普世性利益为交流合作切入点、以不同文化共鸣之处为展演,弱势方通过国际传播使强势方认可其国家形象并接受合作诚意。

综合干预联合盆底康复治疗对围绝经期女性盆底功能障碍性疾病的影响

目的:探讨综合干预联合盆底康复治疗对围绝经期女性盆底功能障碍性疾病(PFD)的影响。方法:选取2021年10月—2022年12月贵州航天医院收治的160例围绝经期PFD患者作为研究对象,以随机数字表法分为研究组与对照组,各80例。对照组实施盆底肌康复治疗,研究组在对照组基础上进行综合干预。比较两组干预效果。结果:研究组总有效率高于对照组,差异有统计学意义(P=0.043)。干预6、12周后,两组Ⅰ、Ⅱ类肌纤维疲劳度和盆底功能评分逐渐降低,且研究组低于对照组,两组Ⅰ、Ⅱ类肌纤维电压值逐渐升高,且研究组高于对照组,差异有统计学意义(P<0.05)。结论:综合干预联合盆底康复治疗对围绝经期女性PFD的干预效果显著,可改善盆底肌疲劳度、电压值、盆底功能。

水库近坝高位滑坡滑带抗剪强度参数综合确定研究

滑坡滑带的抗剪强度参数是进行滑坡稳定性评价和滑坡涌浪等灾害链研究必需的数据基础,科学合理确定滑带物理力学参数至关重要.本研究以澜沧江GS水电站MLS滑坡为依托,采用现场调查、大型原位剪切试验、室内重塑样剪切试验、室内原状样剪切试验、工程地质类比法及参数反分析法,综合确定滑带抗剪强度参数.采用数值模拟软件运用所得参数对滑坡进行变形破坏分析.数值计算结果与现场滑坡监测变形数据相吻合,验证了采用多方法综合选取滑带抗剪强度参数的准确性和合理性.研究成果可为MLS滑坡稳定评估和防治工程设计等提供技术支撑和参考借鉴依据.

生态烧结料制备免烧砖试验研究

以生态烧结料为主要原料,采用压制成型法制备免烧砖,研究了成型压力、原料配比等对免烧砖抗压强度的影响,并进行了免烧砖制备工业化试验。结果表明:成型压力20 MPa时,在m(生态烧结料):m(水泥):m(炉渣):m(废砖石)=45:15:15:25条件下,免烧砖的7、28 d抗压强度分别达到12.98、16.04 MPa;按照优化的原料配比,工业化试验制备的免烧砖性能符合JC/T 422—2007《非烧结垃圾尾矿砖》中MU15要求,试样表面无凹凸、裂缝、破损和分层等现象。凝胶物质与生态烧结料中矿物以及其他物质相互交织,将胶凝材料体系中的颗粒紧密包裹,形成致密的网状结构,提高了免烧砖的抗压强度。

基于Rough集理论的产业竞争力综合测评分析

一个国家的竞争力不一定在于整个国民经济 ,而主要看该国有无一些独具特色的产业或产业群 .本文从产业的效益、发展、均衡三维视觉构建了描述产业竞争力的指标体系 ,并应用新型的数学工具——粗集理论 。