Coronary bypass in vascular patients: a relatively high-risk procedure

A premise of cardiac risk stratification is that the added risk of coronary artery bypass grafting (CABG) is offset by the improved safety of subsequent vascular reconstruction (VR). We questioned if elective CABG is patients with severe peripheral vascular disease (PVD) is a relatively high-risk procedure. A cohort study of 680 elective CABG patients from January 1993 to December 1994 was performed using three mutually exclusive outcomes of complication-free survival, morbidity, and mortality. Patient characteristic, operative, and outcome data were prospectively collected. Retrospective review determined that 58 patients had either a standard indication for or a history of VR. Overall CABG mortality was 2.5%, with statistically similar but relatively higher rates for PVD as compared to non-PVD patients. In contrast, major morbidity occurred at rates 3.6-fold higher in PVD patients (39.7%) than in disease-free patients (16.7%) after adjustment for the effects of patient and operative variables (odds ratio [OR] 3.67, 95% confidence interval [CI] 1.93-6.99). CABG morbidity in the PVD patient was most likely in those patients with aortoiliac (OR 9.51, CI 3.20-28.27) and aortic aneurysmal (OR 5.24, CI 1.28-21.41) disease types. CABG in PVD patients is associated with significant major morbidity. Such morbidity may preclude or alter the timing of subsequent VR.     

通用绘图软件NuSlides中的面向对象的用户界面设计

本文描述在Ｕｎｉｘ环境下开发的通用绘图软件ＮｕＳｌｉｄｅ中的图形用户界面的设计思想和实际方法。其特点是基子面向对象的技术，提供多窗口、菜单驱动、选择面板、键盘输入等多种才法。该图形用户界面具有灵活性、可扩充性和易使用性。     

DGPSL：A DISTRIBUTED GRAPHICS LIBRARY

ＤＧＰＳＬ：ＡＤＩＳＴＲＩＢＵＴＥＤＧＲＡＰＨＩＣＳＬＩＢＲＡＲＹＳｈｉＪｉａｏｙｉｎｇ；ＰａｎＺｈｉｇｅｎｇ；ＺｈｅｎｇＷｅｎｔｉｎｇＤＧＰＳＬ：ＡＤＩＳＴＲＩＢＵＴＥＤＧＲＡＰＨＩＣＳＬＩＢＲＡＲＹ￥ＳｈｉＪｉａｏｙｉｎｇ；ＰａｎＺｈｉｇｅｎｇ；...     

程序可视化系统ProVS的设计和实现

本文研究程序代码可视化技术，即从现存的程序生成某种可视化表示，增强程序的易读性、易理解性和易维护性。首先介绍ＰｒｏＶＳ的设计思想和实现技术，然后给出输出例子。     

SnO2超微粒子薄膜的气敏特性研究

作者用自行设计的直流气体放电活化反应蒸发装置制备出平均粒径约为40nm的SnO_2超微粒子薄膜.研究了不同氧分压下所得SnO_2超微粒膜的形貌、结构和组成等特性,以及不同样品对各种易燃气体的气敏特性,得出了灵敏度随氧分压及灵敏度随工作温度的变化曲线.     

Influence of interfacial microcracks on the elastic properties of composites

A model is established to quantify the influence of interfacial microcracks on the elastic properties of a particulate composite using a combination of theoretical and finite element analysis. A unique way to construct physical models which could accommodate both crack size and crack density is proposed. Based on energy principles, the influence of a dilute concentration of interfacial microcracks is first studied. The case of a finite concentration of microcracks is solved subsequently by combining the dilute concentration solutions and the differential scheme. Both cases agreed well with existing composite theories for the limiting condition of complete decohesion. The final model predicts the effective elastic properties as functions of both crack size and microcrack density.     

L-肉碱的酶法生产

要L-肉碱是与动物体内脂肪酸代谢有关的化合物,主要功能是作为载体将长链脂肪酸从线粒体膜外输送到膜内促进脂肪酸的β-氧化,将脂肪代谢转变为能量。L-肉碱广泛用于医药、保健食品及饲料等行业。江苏省微生物研究所在成功解决了高转化率微生物酶的选育、肉碱与巴豆甜菜碱的分离技术和巴豆甜菜碱的回收问题后,开发了L-肉碱的微生物酶法生产技术,并与常茂生物化学工程有限公司合作进行了日产1kg规模的中试,用300L发酵罐发酵产酶,150L酶反应器进行酶转化,L-肉碱的发酵水平达15g/L以上,用401L有机玻璃层析柱系统提取精制,提取收率达70％以上,产品质量符合USP23版标准。     

天然气在应用领域的市场竞争力简析

文章以上海当前能源价格为例,讨论天然气与其他可替能源在应用领域的能耗费用,分析天然气的市场竞争力。     

挤压力对晶体生长速度及枝晶间距的影响

研究了挤压铸造时挤压力对宏观晶体生长速度的影响，给出了晶体生长速度表达式。结果表明：挤压力对合金宏观晶体生长速度的影响除与合金成分有关外，在某些挤压条件下，当形核率的增加幅度超过长大速度时，则挤压力可使宏观晶粒细化；反之，会使宏观晶粒变粗。随着挤压力的提高，合金凝固速度加快，一次枝晶间距和二次枝晶间距都随之减小，从而细化了树枝晶。