电缆桥架的稳定问题

将弹性稳定理论应用于工程实际，并全面讨论了电缆桥架的翼缘、腹板和整体稳定性问题，给出了临界载荷算式，经桥架稳定性试验考核，得出了一些实用性的结论。这不仅为电缆桥架的标准制定提供了依据，也可为其他薄壁件的稳定设计计算作参考。     

脉冲反射法在现代市话电缆障碍测试中的应用

电信事业的飞速发展 ,电话不断扩容 ,使得现代市话电缆线路线径越来越细。因此市话电缆线路障碍概率增加 ,如何利用原有测试仪器 ,采用脉冲反射法快速检测、排除市话电缆障碍 ,其关键就是内部阻抗平衡问题与测试方法问题     

论太平天国档案流失海外的原因、经过及其具体分布

太平天国在14年的革命历程中产生了大量档案,然而,在国内,这些档案随着太平天国运动的失败几经磨难、丢失和损毁。幸而,在国外还有大量的太平天国档案得以保存。文章在前贤的基础上对流失海外的太平天国档案进行整合汇总,将收藏在海外的太平天国档案调查清楚,为将来追索这些太平天国档案提供参考。     

南京电大新校区校园网络的规划、设计及其应用

文章阐述了南京广播电视大学新校区校园网络建设、现代教育技术装备的规划和设计,校园建网应考虑的问题及前期准备工作,以及建成后的应用,重点就校园网络综合设计方案的多方面展开论述,并给出具体的实施方案和设备选型。根据总体设计、分段实施、重视基础建设的原则,做到“规划到位、分步建设、科学管理、先进开放”。我校校园网建设分三个步骤进行,即综合布线、系统集成、子功能单元建设,并充分考虑各步骤问的整合。     

Serum Urea:Albumin Ratio as a Prognostic Marker in Critical Patients With Non-Chronic Kidney Disease

Routine laboratory investigations play an important role in estimating the risk of mortality in intensive care unit (ICU) patients. The significance of urea:albumin ratio (UAR) in predicting the stay and mortality of ICU patients is not known. It is a retrospective study of patients admitted to ICU (n = 412) with non-chronic kidney disease (non-CKD). Receiver-operating characteristics (ROC) analysis for predicting mortality was carried out to find area under curve (AUC) and threshold levels. Analysis of survival probability was carried out by Kaplan–Meier method and Log-rank test. The AUC to predict mortality were 0.695, 0.767 and 0.791 for serum albumin, urea and UAR, respectively. The threshold levels for albumin, urea and UAR were 2.8 g/dL, 53 mg/dL, and 23.44 mg/g, respectively. The highest odds ratio (OR) of 9.75 to predict mortality at threshold level was observed for UAR, while OR were 7.0 and 3.62 for serum urea and albumin, respectively. The serum urea above and albumin below threshold level were associated with increase in ICU stay of >3 days but the highest OR of 4.73 to predict stay of >3 days was observed for UAR. Kaplan–Meier survival analysis shows significant (p < 0.001) difference at the threshold value of UAR. Serum urea and albumin are found to be an independent predictor for the mortality and stay; however an increased UAR value is the best parameter in predicting mortality and stay in ICU patients with non-CKD illness.     

Parametrically excited oscillation of stay cable and its control in cable-stayed bridges

This paper presents a nonlinear dynamic model for simulation and analysis of a kind of parametrically excited vibration of stay cable caused by support motion in cable-stayed bridges. The sag, inclination angle of the stay cable are considered in the model, based on which, the oscillation mechanism and dynamic response characteristics of this kind of vibration are analyzed through numerical, calculation. It is noted that parametrically excited oscillation of a stay cable with certain, sag, inclination angle and initial static tension force may occur in cable-stayed bridges due to deck vibration under the condition that the natural frequency of a cable approaches to about half of the, first model frequency of the bridge deck system. A new vibration control system installed on the cable anchorage is proposed as a possible damping system to suppress, the cable parametric oscillation. The numerical calculation results showed that with the use of this damping system, the cable oscillation due to the vibration of the deck and/or towers will be considerably reduced. Project supported by National Natural Science Foundation of China (No. 59978044)     

绝缘架空电缆在35kV线路改造中的应用

工程采用了交联聚乙烯绝缘架空电缆代替架空裸导线对线路特殊区段进行绝缘化处理,有效地解决了线路运行中存在的问题,通过对电缆选型、施工情况进行了较为系统的总结和分析,指出在特殊区段采用交联聚乙烯绝缘架空电缆进行绝缘化处理是实现绝缘化的技术跨越,值得推广应用。     

隐元留日不归原因探析

探讨隐元留日不归的原因,不能只看清初福建的政治形势,要更多地从隐元的个性特点以及日方的态度演变来考察,才不至于失之偏颇。隐元在宗教事业上的执着精进是根本内因,而中方时局演变和日方态度变化则是外因。在外因中,江户幕府赐地开创的特殊礼遇是关键。     

What helps children in a pupil referral unit (PRU)? An exploration into the potential protective factors of a PRU as identified by children and staff

Previous studies have focused on the views of excluded children or those finding themselves in Pupil Referral Units (PRUs). Few, however, have focused on exploring views from a resilience perspective. Studies linked to resilience have tended to focus on exploring factors through quantitative rather than qualitative measures. This piece of research aimed to explore the potential protective factors of one PRU through the valuable voices of children and staff. The views of six children aged between 9 and 13 years, all with varying forms of behavioural, emotional and social difficulties, and partway through a PRU placement, were explored through semi-structured interviews supported by the use of tools and techniques to facilitate discussion. The views of four staff members were also obtained. Findings reveal the powerful perspectives that children and young people can bring in relation to what might be helping them within a particular environment. A number of potential protective factors, both within the environment and within-child factors that may operate as mechanisms in fostering positive social and academic outcomes, are identified. Implications of these findings for professional practice, and for children finding themselves in PRU provision, are discussed, with a focus on reintegration and the potential impact of changing environments for these children.     

Earth return path impedances of underground cable for three-layer earth

One of the factors that affect the parameters of an underground cable is earth return path impedance. Pollaczek developed a formula for the case of one-layer （homogenous） earth. But in practice the earth is composed of several layers. In this study we develop a new formula for earth return path impedance in the case of a three-layer earth. To check the accuracy of the obtained results, a comparison has been made with the finite element method （FEM）. A comparison between the results of the Pollaczek formula and results of the obtained formula for a three-layer earth has been made, showing that the use of the Pollaczek formula instead of the actual formula can cause serious errors.