用价连接性指数研究酯类气相色谱保留指数

用价连接性指数^1X相关了100种酯类化合物的气相色谱保留指数,相关系数为0．9930,平均相对误差为2．15。比Randic-kier^1X^v有所改善。     

Structure Underlies Other Organizational Determinants of Mental Health: Recent Results Confirm Early Sociotechnical Systems Research

Workplaces are implicated in the current global epidemic of mental illness. This paper presents early results from an action research project designed to investigate and prevent mental illness at work. It treats the organization as an open sociotechnical system where mental health is measured by self report and the affects experienced at work. Sick days are also measured. The study finds that the second genotypical, organizational design principle creates enabling conditions for mental health, many of which enablers such as trust and equality have previously been hypothesized as determinants of mental health. But the enablers are themselves consequent to a design principle. The results show how the second design principle creates the jointly optimized sociotechnical system that leads to enablers and positive outcomes, for people and the bottom line. This research reinforces the conclusion from the first study of sociotechnical systems that structure is a determinant of mental health.     

胎衣不下对奶牛产后繁殖力的影响研究

通过对574头初产母牛和1269头经产母牛泌乳期资料的生物统计学分析,研究胎衣不下对产后奶牛繁殖力的影响,同时按母牛是否伴发子宫炎或(和)卵巢囊肿分组,比较了它们可能对产后繁殖力的影响。患子宫炎或(和)卵巢囊肿的母牛,其胎衣滞留时间的长短对产后繁殖力无明显影响。单纯胎衣滞留的初产母牛,首次配种受胎率明显降低。经产母牛中,胎衣滞留超过5天者,首次配种受胎率降低25％(P<0.05),空怀时间延长17天(P<0.05);若胎衣滞留时间超过7天,首次配种时间延迟21天(P<0.05),首次配种受胎率降低35％(P<0.01),空怀时间延长66天(P<0.01)。     

脂肪醇分子结构与气相色谱保留值间的关系

本文应用Benson基因加和法对脂肪醇分子结构与其气色谱保留值间的关系进行了研究，计算结果表明，脂肪酸的气相色谱保留体积具有很好的基因加和性。     

荷叶香气成分的研究（Ⅱ）荷叶精油成分分析及其与天然香气成分的比较

以同时蒸馏萃取法（SDE）提取荷叶精油。用毛细管GC／MS／DS联用法分离鉴定了91种组分，战总峰面积的95．64％。再用双柱GC标样程升保留指数确证了其中38种组分。已确证的组分占总峰面积的64．20％。主要成分及含量是顺－3－己烯醇（27．49％）、反－2－戊烯醇（11．07％）、1－戊烯－3－醇（9．01％），反－2－己烯醛（5．36％）。     

常温下膨胀颗粒污泥床(EGSB)反应器处理城市污水

研究了用膨胀颗粒化污泥床(EGSB)反应器处理常温条件的城市污水.实验结果表明:在回流比为1∶1,水力停留时间(HRT)为2~24 h范围内,城市污水经EGSB处理后,其出水平均ρCOD为78 mg.L-1,ρSS为18mg.L-1,色度16,浊度12,pH 7.5~pH8.3,满足城镇污水处理厂二级排放标准.出水ρCOD中,硫化物占约50%的比例,脱除出水中的硫化物是进一步降低ρCOD浓度的关键.在一定的范围内(1∶1~14∶1),回流比对出水ρCOD影响较少,但当回流比为18∶1,上升流速为3.8 m.h-1时,污泥流失严重,出水恶化.     

程序升温条件下毛细管短柱和长柱气相色谱保留行为的比较

本文研究了程序升温条件下不同组份在毛细管短柱和长柱中的气相色谱保留行为。提出了长柱和短柱的适用条件。     

Computer simulation on reliability of retention index with FDG-PET and optimization of dual-time-point imaging protocol

The inherent noise in positron emission tomography (PET) leads to the instability of quantitative indicators, which may affect the diagnostic accuracy for differentiating malignant and benign lesions in the management of lung cancer. In this paper, the reliability of retention index (RI) is systematically investigated by using computer simulation for the dual-time-point imaging protocol. The area under the receiver operating characteristic (ROC) curve is used to evaluate the optimal protocol. Results demonstrate that the reliability of RI is affected by several factors including noise level, lesion type, and imaging schedule. The Ris with small absolute values suffer from worse reliability than those larger ones. The results of ROC curves show that over delayed second scan cannot help to improve the diag- nostic performance further, while an early first scan is expected. The method of optimization based on ROC analysis can be easily extended to comprise as many lesions as possible.     

毛细管气相色谱柱轴向非均匀性对保留值的影响

用理论和实验方法研究了柱轴向非均匀性对保留时间的影响。理论计算和对典型非均匀柱的实验表明，柱管的非均匀性是影响绝对保留值的一个不可忽视的因素，在基于均匀假定的保留值模拟中会引入系统误差。提出了柱均匀性的简单判据：相同柱压和温度条件下调换柱的进出口后保留时间不变是柱均匀的充分必要条件，是柱几何对称必要条件。对梯形柱，进样口较小时保留时间较短。     

IVR策略下反应堆压力容器变形数值模拟

堆内熔融物滞留技术(in-vessel retention, IVR)是中国三代核电厂设计中广泛采用的严重事故的缓解策略,其成功的关键在于反应堆压力容器(reactor pressure vessel, RPV)外壁面导出热量高于堆内衰变热。在堆内高温熔融池的作用下,RPV会发生明显的热膨胀并导致外壁面冷却流道形状改变,从而对局部换热情况产生影响。为了提供RPV外壁面换热研究的输入条件,通过COMSOL多物理场耦合计算软件搭建了一个热工水力和固体力学耦合计算模型,研究了严重事故下RPV的热膨胀形变情况。计算结果表明在RPV外部实现冷却条件下,下封头区域的热膨胀形变将导致外冷却流道宽度明显减小,在工程设计中应予以考虑。事故后RPV内压对膨胀形变影响明显,严重事故后对一回路泄压是IVR策略成功的重要因素之一。