浅谈面向对象分析的基础教学

针对一个业务应用实例进行介绍,从而引入软件工程、面向对象分析的基本概念、优点和表示方法,并向读者展现如何在程序设计课程中开展面向对象分析与设计的基础教学。     

真空紫外辐照对Lumogen薄膜损伤及光学性能的影响

为研究Lumogen(C22H16N2O6)薄膜在真空紫外波段的光致发光特性及辐照损伤,采用热阻蒸发法,以氟化镁为基底制备Lumogen薄膜.使用真空紫外荧光光谱仪、原子力显微镜(AFM)、扫描电子显微镜(SEM)、紫外?可见分光光度计等仪器分别对薄膜的光致发光特性、荧光强度衰减变化、表面形貌、透过率等进行测试与表征....     

气候变化对办公建筑极端负荷的影响

利用TRNSYS能耗模拟软件模拟了1961—2009年天津市典型办公建筑的供暖和供冷负荷,结合同期气象资料,着重分析了建筑极端负荷与气候变化的关系。结果表明,1961—2009年办公建筑供暖极端负荷日数极显著下降,而供冷极端负荷日数无显著变化;供暖期和空调期过渡月份的极端负荷日数出现较少,供暖期极端负荷占总负荷的比例呈减小趋势,在空调期的变化不大;供暖极端负荷日数主要受气温的影响,而供冷极端负荷日数除受气温影响外,还与相对湿度的变化有关。     

Fracture analysis of laser beam welded superalloys Inconel 718 and 625 using the FITNET procedure

This paper presents results of the analysis for residual strength prediction of two laser beam welded superalloys (Inconel 625 and 718) using the fitness-for-service (FFS) procedure FITNET. The analysis is based on Option 3 of the Fracture Module of the procedure arising from the European Community funded project FITNET (www.eurofitnet.org). Analysis option 3 requires full stress–strain curves of the materials as input data. Since the strength mismatch ratio (M) between the weld and the base metals for both alloys was less than 10%, a homogeneous solution route has been used for welded tension loaded specimens containing through thickness central cracks. The FITNET predictions of the attained maximum load levels of the specimens were verified with the generated experimental results. The analysis methodology, as well as comparison between predictions and experimental results are provided. Accurate yet conservative estimation of the maximum load carrying capacities have been achieved depending on the input data; as the input data becomes more detailed, the degree of conservatism decreases.     

液力变矩叉车缓动功能研制

通过研究液力变矩叉车传动特性,研制出一套可实现液力变矩叉车缓动功能的控制装置。该装置通过检测操纵手柄位置,采用台达PLC控制步进电机驱动丝杠运动,从而实现对发动机转速的控制;通过触摸屏修改控制参数进行现场调试,实现液力变矩叉车在怠速作业时,通过操纵手柄就可以顺利稳定的平移、提升或倾斜作业,从而使得叉车操作更加方便,且降低了操作人员的劳动强度,具有很高的性价比。     

Reaction Mechanism and Kinetics of 1,8‐Diazabicyclo[5.4.0]undec‐7‐ene and Carbon Dioxide in Alkanol Solutions

Carbon dioxide‐binding organic liquids (CO₂BOL) are a new class of solvents with advantageous properties such as high boiling points, low specific heats, high absorption capacities, and easily reversible reactions. In order to implement these solvents in processes, the reaction characteristics must be determined a priori. This work presents an analysis of the rate constants and activation energies of the reaction between carbon dioxide and 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) in 1‐hexanol and 1‐propanol. The reactions were found to comply with a termolecular reaction mechanism and exhibited pseudo‐first‐order behavior in the presence of excess DBU and 1‐alkanol. It was concluded that DBU‐based CO₂BOL are environmentally friendly and easy‐to‐handle solvents that may provide great flexibility and improvements over conventional carbon dioxide absorption processes.     

Pacemaker endocarditis due to Candida albicans: case report and review

We describe a case of pacemaker endocarditis due to Candida albicans in a patient who responded favorably to combined surgical and antifungal therapy. Only five cases of candidal pacemaker endocarditis have been reported previously. We review these five cases and discuss the clinical presentation and therapy for this disease in comparison with candidal prosthetic valve endocarditis.     

Effect of medication on biomechanical properties of rabbit bones: heparin induced osteoporosis

BACKGROUND: We hypothesize that the integrity of the latissimus dorsi muscle graft used to wrap the heart may affect the clinical outcome of patients undergoing dynamic cardiomyoplasty. METHODS: By correlating the pathologic findings with their clinical course in five patients who died 1 month to 6 years after dynamic cardiomyoplasty operation, we sought to discern findings that might shed light on the pathophysiology of cardiomyoplasty. RESULTS: Of the two patients who had a limited clinical response, one had an atrophic, edematous latissimus dorsi muscle with fatty infiltration resulting from cardiac cachexia, and the other had insufficient length of latissimus dorsi muscle to cover a large heart. The remaining patients responded well clinically without signs of pump failure and died at various intervals, mostly of arrhythmias. Autopsy findings included the following: (1) one patient with ischemic cardiomyopathy as the underlying disease had development of rich vascularity in the interface between the muscle wrap and the epicardium; whereas in four others with idiopathic cardiomyopathy, such evidence of collateralization was far less evident. (2) There was a variation in the skeletal muscle transformation achieved, with the fraction type I fatigue-resistant fiber in the muscle wrap ranging from 60% to 100%, in spite of the identical transformation protocol used. Such variation is believed to be genetically based. (3) In one patient, the skeletal muscle was paced to contract at 30 to 50 times/minute (2:1 ratio) for more than 5 years. Nevertheless, the pathologic specimen of the muscle wrap showed only minimal interstitial fibrosis. (4) Relatively thin muscle wrap around the heart found at autopsy could be atrophy but most likely was related to muscle transformation, which is known to reduce muscle mass and increase capillary density. (5) All skeletal muscle grafts showed geometric conformation to the shape of the epicardium and grossly looked as if they were an additional layer of the ventricular wall. Such conformation may facilitate the modulation of the ventricular remodelling process in the failing heart, as has been described both in clinical and experimental studies. CONCLUSIONS: Our findings are consistent with and support a number of mechanisms proposed for cardiomyoplasty. Thus preservation of latissimus dorsi muscle graft integrity may be important in the success of dynamic cardiomyoplasty.     

用广义协调Coons混合曲面元分析中厚板的振动

利用文献[1]的厚薄板通用广义协调元Coons混合曲面法分析了中厚板的振动,其优点是自由度少、精度高、程序简便、收敛快。算例计算出了四边简支方板的前几阶频率,其结果与文献[2]的结果符合良好。     

A comparative study of the antithrombotic effect through activated endothelium of garlic powder and tomato extracts using a rodent model of collagen and epinephrine induced thrombosis

Food Science and Biotechnology - In this study, garlic powder, tomato extract and a mixture of both were analyzed for anti-thrombotic effects using a collagen and epinephrine induced thrombosis...