妊娠期高血压疾病眼底病变的视网膜和脉络膜厚度变化分析

目的:探讨分析妊娠期高血压疾病眼底病变的视网膜和脉络膜厚度的变化特征。方法:选择2016年7月-2018年12月本院收治并确诊为妊娠期高血压疾病眼底病变患者60例115眼为研究对象,应用散瞳眼底检查和黄斑EDI-OCT检查确诊患者眼底病变情况,根据Duke-Elder分期标准分为眼底正常、眼底病变Ⅰ期、Ⅱ期及Ⅲ期,测量各组中心凹处视网膜、脉络膜厚度和黄斑区各象限脉络膜厚度。结果:本研究检查60例妊娠期高血压疾病患者115眼,显示眼底正常者12例24眼(20.87%),48例91眼(79.13%)呈不同程度眼底病变。不同程度眼底病变的妊娠期高血压疾病患者的视网膜和脉络膜厚度发生不同程度改变。眼底Ⅱ期病变患者黄斑区各象限脉络膜厚度、中心凹处视网膜和脉络膜厚度均较眼底正常者低,差异均有统计学意义(P<0.05);Ⅲ期病变患者黄斑区各象限脉络膜厚度、中心凹处视网膜和脉络膜厚度均较其他者高,差异均有统计学意义(P<0.05)。结论:妊娠期高血压疾病患者眼底Ⅲ期病变黄斑区、中心凹处视网膜和脉络膜厚度有明显改变,通过对妊娠期高血压疾病患者眼底筛查,有助于及时发现眼底病变,并制定有效的治疗方案,改善视网膜和脉络膜病变的微循环。     

蓄冷降温式太阳电池组件供电供热的实验研究

开发了蓄冷降温式太阳电池组件,实验研究结果表明,与常规平板式太阳电池组件相比,蓄冷降温式太阳电池组件效率提高10%以上,同时,可获得最高温度接近40℃的热水.分析了制得的低温热水的应用方法.     

Comparison and evaluation of statistical criteria in the solar cell and photovoltaic module parameters’ extraction

ABSTRACT

Recently, the extraction of photovoltaic parameters was the subject of intensive debate in the scienti?c literature. This paper presents an analysis and comparison of the use of the statistical errors in extraction of single and double diodes of the solar cell and photovoltaic module parameters. The compared errors are based on the utilisation of the firefly algorithm. The objective function used is adapted to minimise the absolute errors between the experimental and predicted current values. Two technologies of the solar cell are used to compare; a mono-crystalline silicon solar cell and the polycrystalline silicon photovoltaic module with 36 cells connected in series. The performance of the extracted parameters and current is compared with recent algorithms and techniques. The analysis and comparison of commonly used error measure help in evaluating the predictive ability of parameters extraction. The comparisons demonstrate that the firefly algorithm in statistical errors measure provides high performance and accuracy of the extracted parameters.     

Parameters identification of photovoltaic solar cells and module using the genetic algorithm with convex combination crossover

To design a high-performance photovoltaic (PV) system, the parameters extraction of solar cell models is exceedingly crucial. A new variant of the genetic algorithm (GA) called Genetic Algorithm with Convex Combination Crossover (GACCC) is proposed to identify the unknown electrical parameters of different solar cell models, i.e. single diode, double diode, and PV module. GACCC is achieved by integrating a new crossover operation to maintain a good balance between the intensification of the best solutions and the diversification of the search space. To test the proposed GACCC, we have compared it to the basic GA and with other literature techniques. The results indicate a high performance of developed approach GACCC and a high accuracy of estimated parameters. In addition, the efficiency of the results is confirmed by the good agreement between the experimental I-V data and the simulated results in all cases.     

Power output analysis of transparent thin-film module in building integrated photovoltaic system (BIPV)

The power output of PV module was characterized depending on incidence angle and the azimuth using a transparent thin-film solar cell in a mock-up model at various slopes to the south, as a building integrated photovoltaic system. Simulated data was also evaluated to determine the influence of the inclined angles and the azimuth on the power performance of the PV module. The experimental and computed data fitted comparatively well through the relative error estimation after calibration. It was found that the PV module with a slope of 30°, facing south, provided the best power performance according to an annual power output, producing about 2.5 times higher power output than that with the vertical module. Furthermore, the PV module facing south showed higher power output than that to the east. The varying power output of the PV module with inclined angles can be explained by the impact of the incidence angle modifier of the glass on the PV module. Specifically, the increased inclined slope of the PV module resulted in the reduced solar energy transmission, which producing a significant reduction of power output for the PV module with a slope over 70°.     

太阳能玻璃的透过率及光伏组件中胶的黏结强度研究进展

本文综述了提高太阳能玻璃透过率的方法,如利用超白玻璃的不同花型,自洁净膜和减反膜等,以及光伏组件中胶的黏结强度的研究现状与研究进展。     

混凝土泵新型液压控制模块

混凝土泵液压传动系统有闭式系统和开式系统2种模式，其中开式液压系统因其制造成本低廉得到广泛应用。开式液压系统又分为电控换向和液压换向2类，电控换向液压系统对设计制造者来说容易掌握，而倍受用户青睐的液压换向系统由于液压阀的品种和数量多、连接管路多、阀底块加工工艺复杂、深孔多、不易加工，因而受到一定的制约。一种新型混凝土泵液压控制模块克服了上述许多缺点，是一项易于推广的新技术。     

光伏建筑的分离式与合一式

我国的光伏建筑刚刚起步,有着广阔的发展前景。对于各种形式的光伏建筑系统,还有一个深化认识、不断探索的过程。我们将在工程实践中不断总结经验,创造出符合我国国情的光伏建筑设计施工的成套技术,为绿色节能建筑作出贡献。     

动臂塔机臂架模块的新型安装方法

介绍超高层建筑用动臂塔机臂架模块的一种新型安装方法。该方法打破传统臂架、起升和变幅钢丝绳安装方式,起重臂、起升钢丝绳和吊钩地面组装,变幅绳上支座平台缠绕,最后巧妙运用辅助滑轮安装拉杆滑轮组。整个安装过程经过反复验证,相对传统安装方法操作安全性和方便快捷性显著提升,值得推广应用。