装备综合保障模型及应用综述

在介绍综合保障模型研究背景的基础上，按模型建立方法和模型应用对象对综合保障模型进行分类研究，并指出其中的重要模型和主要应用领域；分析了我军综合保障模型研究现状及存在不足，明确了今后在相关领域的研究方向。     

A stress-coping profile of opioid dependent individuals entering naltrexone treatment: A comparison with healthy controls.

Background: Stress is known to increase addiction vulnerability and risk of relapse to substance use. Purpose & Method: We compared opioid dependent individuals entering naltrexone treatment (n = 57) with healthy controls (n = 75) on measures of stress, coping, and social support and examined the relative contribution of group membership, coping, and social support to stress within the sample. Analyses of variance (ANOVA) and covariance (ANCOVA), and stepwise multiple regression were conducted. Results: Compared with controls, opioid dependent subjects reported greater stress, less use of adaptive coping, but comparable use of maladaptive/avoidant coping. No group differences were found with respect to social support. Perceived stress was predicted by group membership, low social support, and greater use of maladaptive/avoidant coping, and the prediction by social support and maladaptive/avoidant coping did not differ by group. Conclusion: Opioid dependent individuals entering naltrexone treatment experience higher levels of stress and report less use of adaptive coping strategies when compared with controls. Group membership, maladaptive/avoidant coping, and social support independently contribute to perceived stress. Findings suggest that novel treatment approaches that decrease maladaptive/avoidant coping and improve social support are important aspects of decreasing stress during early recovery from opioid addiction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

综合支护技术在软土深基坑支护工程中的应用

针对深圳市图书馆大厦深基坑支护工程中采用搅拌桩截水帷幕联合土钉墙及预应力锚索的综合支护方法进行了介绍,指出采用该方法使得基坑施工工期大大缩短,成本降低,且经现场结果测试,边坡没有发生明显位移,基坑内也没有出现渗水现象,值得推广。     

基于LASSO-WOA-LSSVM的海洋管线外腐蚀速率预测

目的 构建海洋管线外腐蚀速率预测模型,提高海底油气管线外腐蚀速率预测的准确性.方法 建立基于套索(LASSO)回归和鲸鱼优化算法(WOA)的最小二乘支持向量机(LSSVM)腐蚀速率预测模型,采用LASSO回归方法对指标进行筛选,提取海洋管线腐蚀的主要影响因素.应用最小二乘支持向量机算法建立海洋管线外腐蚀速率预测模型,并使用鲸鱼优化算法对模型参数进行优化,避免了参数取值对模型回归性能的影响.以海洋挂片实验为例,通过MATLAB进行模拟仿真,分析验证模型预测结果,并将预测结果与其他模型进行对比分析.结果 LASSO回归算法筛选得到影响腐蚀速率的主要因素为:温度、溶解氧含量、pH值.采用WOA-LSSVM模型所预测的结果与实际值较为吻合,其平均相对误差为2.23％,均方根误差(RMSE)为0.3248,决定系数R2达到0.9708,均优于其他两种模型.结论 基于LASSO回归和鲸鱼优化算法的最小二乘支持向量机预测模型具有更优的泛化能力和预测精度,为海底管道腐蚀研究工作提供了新思路,也为海洋油气输送系统的结构安全与风险防范提供了参考.     

输电线路最佳经济寿命区间评估

为提高电网规划与运维决策的科学性,提出了一种以全寿命周期年平均成本最小为依据的输电线路最佳经济寿命区间评估方法。该方法在计算输电线路故障率时,不仅考虑了线路役龄,还考虑了气候与自然灾害、地理与外力破坏环境因素,以及部件与土建、运行与检修质量状况对输电线路故障率的影响;并采用最小二乘支持向量机按故障后果严重程度分别计算一般故障、较大故障和严重故障3类故障率,使得故障率的计算更加可信。此外,该方法采用区间分析法计算输电线路寿命周期的各项成本,消除了单一定值带来的成本计算误差。算例验证了输电线路最佳经济寿命区间评估方法的有效性,并指出了评估结果对电网规划与运维决策的指导作用。     

基于支持向量机的电站锅炉煤灰熔点预测

为解决结渣问题对电站锅炉高效稳定运行的影响,探讨了一种煤灰熔点预测模型。首先分析锅炉混煤燃烧时的煤灰结渣特性,介绍了支持向量机(support vector machine,SVM)回归方法,将煤灰中的8种氧化物成分作为输入量,以煤灰熔点作为输出量,建立煤灰熔点的SVM回归预测模型,并采用遗传算法对模型参数进行寻优。经过仿真实验,将模型的预测结果与广义回归神经网络模型的预测结果进行比较,结果表明本预测模型预测精度高、泛化能力强,有助解决电站锅炉的动力配煤技术中的结渣问题。     

一种风电机组的低压穿越改造装置研究

介绍了一种简便的1.5 MW双馈风电机组的低压穿越改造方法,该方法不需对机组主控、变桨及变频器进行任何改造,只要在机组并网点处串入一台低压穿越控制设备,就可使风电机组满足GB19963—2011要求的低压穿越能力。在电网故障时,该设备快速关断主功率回路,同时输出无功功率支撑电网电压,并同步发电机定子电压,使机组保持稳定运行。此方法特别适用电控型号较老、低压穿越改造成本较高的1.5 MW风电机组。     

基于FOABHC＿SVM的微电网短期负荷预测模型

为适应微电网的建设和发展对负荷预测效率及精度的要求,针对微电网负荷基数小、间歇性和随机性大等特点,提出一种基于历史认知果蝇优化算法（FOABHC）－优化支持向量机（SVM）的微电网短期负荷预测模型。以国内某微电网示范工程项目为例,将FOABHC＿SVM用于微电网短期负荷预测。实例仿真结果表明,所提出的FOABHC＿SVM预测模型优于SVM预测模型,更适用于当前微电网短期负荷预测需要。     

省级电力客服中心供电服务业务支撑作用的思考

通过对95598全业务集中后,省级电力公司客户服务中心业务职能在营销业务中的角色转换和支撑作用方面面临的一些问题的分析,提出应深化信息系统应用、优化指标管控方式、强化信息报送管理、加强内质外形建设等几点建议,以期为更好发挥省级客服中心对供电服务业务的支撑作用提供一些有益的参考。     

NMR imaging of low pressure,gas‐phase transport in packed beds using hyperpolarized xenon‐129

Gas‐phase magnetic resonance imaging (MRI) has been used to investigate heterogeneity in mass transport in a packed bed of commercial, alumina, catalyst supports. Hyperpolarized ¹²⁹Xe MRI enables study of transient diffusion for microscopic porous systems using xenon chemical shift to selectively image gas within the pores, and, thence, permits study of low‐density, gas‐phase mass‐transport, such that diffusion can be studied in the Knudsen regime, and not just the molecular regime, which is the limitation with other current techniques. Knudsen‐regime diffusion is common in many industrial, catalytic processes. Significantly, larger spatial variability in mass transport rates across the packed bed was found compared to techniques using only molecular diffusion. It has thus been found that that these heterogeneities arise over length‐scales much larger than ～100 µm. © 2015 American Institute of Chemical Engineers AIChE J, 61: 4013–4019, 2015