浅析英法哥特建筑的发展

哥特式建筑于11世纪开始登上历史舞台,它在这个舞台上闪耀了8个世纪,也影响了整个欧洲乃至全世界的建筑风格。文章就英法两国哥特式建筑风格在不同历史背景下的发展和形成原因进行对比分析,并挖掘其历史成因和文化内涵。     

Incorporating fault debugging activities into software reliability models: a simulation approach

A large number of software reliability growth models have been proposed to analyse the reliability of a software application based on the failure data collected during the testing phase of the application. To ensure analytical tractability, most of these models are based on simplifying assumptions of instantaneous & perfect debugging. As a result, the estimates of the residual number of faults, failure rate, reliability, and optimal software release time obtained from these models tend to be optimistic. To obtain realistic estimates, it is desirable that the assumptions of instantaneous & perfect debugging be amended. In this paper we discuss the various policies according to which debugging may be conducted. We then describe a rate-based simulation framework to incorporate explicit debugging activities, which may be conducted according to the different debugging policies, into software reliability growth models. The simulation framework can also consider the possibility of imperfect debugging in conjunction with any of the debugging policies. Further, we also present a technique to compute the failure rate, and the reliability of the software, taking into consideration explicit debugging. An economic cost model to determine the optimal software release time in the presence of debugging activities is also described. We illustrate the potential of the simulation framework using two case studies.     

Enhanced photocatalytic H2 evolution over In2S3 via decoration with GO and Fe2P co-catalysts

In this study, GO and Fe₂P were used as co-catalysts to improve the separation efficiency of photogenerated electron-hole pairs in an In₂S₃ photocatalyst. The metallic character of Fe₂P provided a cheap substitute for traditional noble metal co-catalyst for H₂ production in aqueous media. The GO/Fe₂P/In₂S₃ composite demonstrated significantly enhanced photocatalytic activity compared to pure In₂S₃, delivering a H₂ production rate of 483.35 μmol h^?1 g^?1 and a quantum yield was 22.68% under visible light irradiation. The design of the photocatalyst was optimized using “Design Expert” software. The analysis showed that a GO loading of 1.18 wt%, a Fe loading of 5.36 wt%, and a calcination temperature of 180 °C were optimal.     

Antioxidant activity of cyanidins isolated from Ogapy (Acanthopanax divaricatus var. albeofructus) fruits in U937 macrophages

Reactive oxygen species (ROS) are continuously produced in aerobic organisms. Overproduction of ROS is known to play a crucial role in the pathogenesis of many cardiovascular diseases, including atherosclerosis and hypertension. Superoxide dismutase (SOD) and catalase (CAT) play critical roles on the removal of excess ROS. In the present study, we investigated the antioxidant activity of cyanidins from ogapy (Acanthopanax divaricatus var. albeofructus, ADA) fruits against oxidative stress in hydrogen peroxide (H₂O₂)-pretreated U937 macrophages, and explored the plausibility of the therapeutic effect of cyanidins on atherosclerosis. As a result, H₂O₂ generation and lipid peroxidation induced by H₂O₂-pretreatment was decreased by the treatment of cyanidins in U937 macrophages. In addition, increased activity of SOD and CAT was shown in H₂O₂-pretreated cells when treated with cyanidins. Overall, the results obtained in this study showed that cyanidin 3-galactoside and cyanidin 3-lathyroside from ADA fruits could protect macrophages against the damaging effects of H₂O₂ treatment.     

TA32钛合金板成形性能与电磁辅助弯曲成形实验研究

由于TA32钛合金板室温成形性差、精度难以保证,开展了电磁辅助弯曲成形方法的实验研究,通过拉伸和电磁成形实验探究了TA32钛合金的力学性能和成形性能,获得了TA32钛合金板在准静态和动态拉伸下的应力、应变关系,给出了在电磁成形状态下的成形极限应变,阐明了电磁成形作用下的TA32钛合金的增塑机制。采用匀压式电磁辅助弯曲成形的方法对TA32钛合金板开展实验研究,结果表明:电磁辅助弯曲成形方法能够有效地提高弯曲件的成形精度,并且在一定条件下,放电能量越高,贴模效果越好、成形精度越高。带压紧翼的弯曲件的变形区外层过度伸长而产生减薄并开裂,不带压紧翼的弯曲件通过合理地控制放电电压能够获得较好的成形效果。     

浅析英法哥特建筑的发展

哥特式建筑于11世纪开始登上历史舞台,它在这个舞台上闪耀了8个世纪,也影响了整个欧洲乃至全世界的建筑风格。文章就英法两国哥特式建筑风格在不同历史背景下的发展和形成原因进行对比分析,并挖掘其历史成因和文化内涵。     

既有居住建筑围护结构节能改造热工性能优化

既有建筑物窗墙比差异较大,在节能改造过程中窗墙比和窗的热工性能对保温层厚度的影响不可忽视。在《严寒和寒冷地区居住建筑节能设计标准》围护结构节能设计规定的基础上,提出围护结构等效传热系数限值,综合考虑朝向、窗墙比、窗户的类型等因素,建立了外墙保温层厚度计算模型和围护结构热工性能参数优化模型,并以徐州地区某既有住宅为例,验证了模型的可行性。     

阶段时间对CMICAO工艺低温运行特性的影响

研究了低温下多点交替进水阶式A2/O(CMICAO)工艺阶段运行时间对污染物去除率的影响,探讨了DO、ORP以及pH状态参数与污染物去除率之间的关系。结果表明,水温8~10 ℃,泥龄13 d,水力停留时间16 h,污泥浓度2 680~3 560 mg/L,污泥回流比30%,阶段1至6的运行时间为3、2.5、2、3、2.5、2 h时,工艺出水TN、氨氮、NO3--N和TP浓度的平均值分别为10.1、1.1、7.4和0.8 mg/L。硝化反应结束时,pH由下降转为上升,ORP上升趋于平缓,DO上升趋缓;反硝化结束时,ORP曲线明显跌落,pH由上升趋于平缓并略有下降;释磷结束后ORP曲线由下降趋于平缓。降低前好氧池DO浓度,有助于同步硝化反硝化作用的发生,从而提高脱氮效率,节省能耗。