Design of Wind Turbine Blade for Solar Chimney Power Plant

Aiming at the global efficiency of solar chimney power plant (SCPP), we design a wind turbine generation device to elevate its electricity generating efficiency. Based on wind power utilization theory, a new method is proposed to design a type of wind turbine blade for SCPP. The lift and resistance coefficients on different Reynolds numbers of NACA4418 airfoil, which is suitable for experimental solar electricity generation system, are determined by Profili-V2.0 airfoil design software, a program written in Matlab to calculate chord length of the airfoil. The optimization is conducted by class-shape-transformation (CST) parameterization method and Xfoil software. An airfoil design program is designed on the basis of blade element theory and attack angle with the highest lift coefficient to iteratively determine the inflow angle and setting angle. Prandtl’s tip-loss factor is applied to correct the setting angle, after the airfoil data are input into AutoCAD to build an airfoil model which is then imported into Solidworks to draw blades. A new way is put forward to design wind turbine blades in SCPP.     

Improving operational safety during icebreaker operations

The study presented in this paper aims at investigating what safety measures that can be taken to improve the operational safety during icebreaker operations in the Baltic Sea. During icebreaker operations, the icebreaker and the assisted vessel operate in close proximity to each other, a distance which can be even smaller if weather and ice conditions are severe. This poses a severe threat to the operation, since the extremely short distance between the vessels leaves no room for error. The results, which are based on data collected through individual interviews and questionnaires, indicate several possible improvements. Firstly, on a regulatory level, the introduction of an ice navigation certificate for deck officers would set a minimal level of formal competency. Secondly, on a knowledge level, more ice navigation training and better language skills work in favour for the safety. Thirdly, on a technical level, having an electronic chart with target tracking capability increases the efficiency and safety of the passage through ice. In addition to these results, this study shows a need to further research the communication and language situation during icebreaker operations.     

Optimization of CMOS repeater driven interconnect RC line using genetic algorithm

In this work, optimization of complementary metal oxide semiconductor (CMOS) repeater driven interconnect resistive-capacitive (RC) line is carried out using genetic algorithm (GA). This work is aimed at powerdelay- product (PDP) minimization of RC interconnect at 180 nm technology node. The algorithm simultaneously optimizes the values of supply voltage, number of repeaters and repeater width for delay and PDP minimization. The accuracy of results obtained is verified by simulations from Cadence virtuoso tool. For delay minimization, comparison of GA results with previous results of the literature shows an improvement of 44.4% in the value of the optimal number of repeaters required. This improvement is obtained by increasing the repeater size, which also increases power dissipation, so a tradeoff has also been achieved in terms of PDP minimization. The comparison of PDP results obtained in this work, with the results at 70, 100, and 130 nm technologies from literature shows improvement in optimal number of repeaters required. The results of algorithm and simulations are in good agreement and demonstrate the validity of proposed algorithm.     

Enhancing the Efficiencies of Organic Photovoltaic and Organic Light-Emitting Diode Devices by Regular Nano-Wrinkle Patterns

Organic photovoltaic (OPV) cells and organic light-emitting diodes (OLEDs) are energy harvesting and generation devices that have attracted great attention these years because of their low costs, thin film structures, flexibility and environment-friendly manufacturing processes. For such thin film devices, photon management methods that increase the light absorption of OPV cells and the light extraction from OLEDs are highly desirable. Here, we report the experimental efforts to fabricate geometrically tunable and spontaneously formed nano-wrinkle structures with large areas, and the theoretical results on photon management with the nano-wrinkles.     

路基施工对高速公路路域生态环境影响解析

文本以某高速为例,详细阐述了其基础施工过程,并且详细分析了本路段在路基施工过程中,对周围环境造成的影响,同时针对路基施工过程中,何如加强对生态环境保护,提出了具体可行的措施,以供参考。     

经尿道切除综合征的实验研究

本文通过经尿道切除综合征(TURS)的实验研究发现:①冲洗液吸收完时,血钠下降最为明显,而它的恢复与血浆甘露醇的消除在时相上并不一致。低钠的影响大且持续的时间长。②冲洗液吸收后,血钾逐渐升高。高钾血症是实验动物死亡的主要原因之一。③等渗的甘露醇冲洗液吸收,血浆渗透压不发生改变。④死亡兔肺重量明显增加,呈肺水肿表现。无脑水肿存在。④根据动物实验推算,经尿道前列腺切除的患者,术中短时间內吸收38ml/kg以上的冲洗液,有发生TURS的可能。上述结果对TURS病理生理改变的认识及其防治提供了实验依据。     

航运市场运费套期保值方法探讨

分析研究了2种运费套期保值方法远期运价协议和运价指数期货合约，通过典型案例论证了租船人和船东都能利用这2种方法，锁定运费收入或支出，从而规避运价风险的目的；同时对这2种方法进行了分析比较，指出运价指数期货合约具有灵活性且安全的特点，但二者费用有差异，运价指数期货合约需要一定的保证金，实际费用等于经纪人的佣金(通常为0．3％)加上现金保证金的利息。     

宝应二桥刚性斜拉杆的试验及分析

以在建的宝应二桥现浇混凝土刚性斜拉杆的研究对象，对该桥所采用的刚性斜拉杆设计方法及其现场浇筑混凝土施工方法进行试验及分析，以检验按设计方法所求得的斜拉索拉力Ｎ和设计所确定的预应力索线型（圆曲线半径Ｒ与曲线矢高ｆ）是否适宜。从而保持斜拉杆的设计线型，避免混凝土斜拉杆在张拉过程中变形过大甚至开裂，同时也对钢束在管壁内的，贴合情况和预应力摩阻损失进行了试验分析。     

Study of algorithms of new slender ship theory of wave resistance

In this paper, Noblesse‘s New Slender-Ship Wave-Making Theory was investigated numerically. Detailed expressions of zeroth and 1st order wave resistance have been derived and calculation programs have also been compiled. In the single and double integral terms of Green function, the kernel function of wave resistance expression, special function expansion method and Chebyshev polynomials approach have been adopted respectively, which greatly simplify the calculation and increase the convergence speed.     

GPS航姿测定方案及误差分析

该文提出了用两台ＧＰＳ接收机测量同一颗卫星所得的伪距差求算舰船的航向角和姿态角的方法，推证了航向角和姿态角的计算公式。通过误差分析，讨论了影响ＧＰＳ航姿测定的各项误差，提出了ＧＰＳ航姿测量方案。