Exergy analysis of the diesel pre-reforming solid oxide fuel cell system with anode off-gas recycling in the SchIBZ project. Part I: Modeling and validation

Solid oxide fuel cell (SOFC) systems with anode off-gas recirculation (AGR) and diesel pre-reforming are advantageous because they can operate with the current fuel infrastructure. In the SchIBZ-project, the prototype of such a SOFC system for maritime applications has already been commissioned. In this first paper, we model the system devices to conduct an exergy analysis of this real SOFC plant and validate them with experimental values from experiments in laboratory scale. The results of our simulation agree well with the experimental values. The calculations with the validated results may be closer to the real thermodynamic behavior of such system components than previous literature.     

纸面石膏板嵌缝胶的研制

介绍了一种预混型膏状纸面石膏板嵌缝材料，能解决纸面石膏板板缝后期开裂问题。     

基于6σ和目标驱动技术的高速卧式加工中心滑架多目标优化

针对高速卧式加工中心滑架的结构特点,构建了高速卧式加工中心滑架的有限元模型,并利用基于6σ原则和目标驱动技术的有限元优化分析方法对滑架进行多目标尺寸优化设计。首先利用基于6σ原则的分析方法对模型进行参数灵敏度分析,得到对滑架性能影响较大的参数,并将其设置为最终的优化设计变量;然后利用基于目标驱动技术的多目标优化方法对滑架进行以质量、变形和一阶固有频率为目标函数的多目标优化,并根据目标函数的优先等级选取优化结果,通过对比优化前后的有限元分析结果,找到需要进一步改进的薄弱环节。相对于传统的单目标优化方法,基于6σ和目标驱动技术的多目标优化能够更好地解决工程实际问题。     

Inhibition of nitric oxide synthesis extends cerebrovascular autoregulation during hypertension

In anesthetized intact rats, cerebral blood flow is autoregulated until mean arterial blood pressure (MAP) exceeds 150 mmHg. At higher pressures cerebral blood flow breaks through autoregulation and rapidly increases. However, interruption of the arterial baroreceptor reflex eliminates breakthrough of autoregulation. Thus, breakthrough may reflect active rather than passive vasodilatation. We, therefore, sought to determine if breakthrough depends upon synthesis of the vasodilator nitric oxide. Thirty-eight anesthetized adult male Sprague-Dawley rats were studied. In all, MAP was raised by slow i.v. infusion of phenylephrine. In rats pretreated with the nitric oxide synthase inhibitor L-nitroarginine (L-NA; 22 mg/kg i.v.) or with a combination of L-NA plus D-arginine (D-Arg; 240 mg/kg i.v.), breakthrough did not occur even when MAP exceeded 185 mmHg (L-NA) and 165 mmHg (D-Arg). In contrast, breakthrough occurred in rats treated with L-NA plus L-arginine (L-Arg; 240 mg/kg i.v.) and in rats whose basal vascular tone had been increased by pretreatment with arginine vasopressin prior to infusion of phenylephrine. Removal of sympathetic innervation to cerebral vessels attenuated, but did not eliminate, effects of L-NA on breakthrough. Thus, vasodilatation seen with breakthrough of autoregulation depends upon release of nitric oxide or a nitric oxide donor.     

沙洲电厂1号机组排水沟伸缩缝泄漏处理

主要介绍了江苏沙洲电厂1号机组循环水排水沟伸缩缝的处理。主要采用灌浆后进行缝面嵌填,再粘贴橡胶板,最后采用不锈钢板进行保护的处理方案。所用材料包括LW水溶性聚氨酯、HK-9105油溶性聚氨酯、HK-963水下环氧涂料、德国慧鱼化学锚栓、橡胶止水带、不锈钢板等,通过巧妙结合,对排水沟伸缩缝的渗漏问题进行了妥善处理。     

玛丽斯特普服务规程临床应用效果分析

目的研究分析玛丽斯特普服务规程临床应用的效果。方法选择2005年1月～2008年9月120例宫内节育器嵌顿和异位需要手术治疗而无手术禁忌症者,选择2007年1月～2008年9月意外妊娠来我院行人流术130例、宫颈糜烂光热治疗100例,分别随机分为MSI服务规程研究组,ⅠA组60例、ⅡA组65例、ⅢA组50例;常规护理组ⅠB组60例、ⅡB组65例、ⅢB组50例。分析比较各两组患者的焦虑水平、健康知识掌握和满意度。结果研究组术后焦虑水平明显低于对照组,研究组治疗前分别为(42.8±3.56)、(43.8±4.45)、42.5±4.15)(分);治疗后分别为(28.8±3.81)、28.2±3.76)、(27.9±4.02),对照组治疗前后变化不明显。研究组患者健康知识掌握分别为(28.6±3.80)、29.1±3.32)、(27.3±3.72)(分),对照组分别为(19.3±3.71)、(20.2±3.6)、(18.5±3.66)。研究组满意度均为100%,对照组分别为81.3%、80.6%、80.8%。经统计学处理,差异有统计学意义(P<0.05)。结论MSI临床应用降低了患者的焦虑水平,提高了患者的健康意识和满意度。