一种新型光伏电站高压电缆施工装置的研发

文章根据现阶段生产任务的需要,立足现有的电缆施工方式及方法,研制出一种新型的用于光伏电站的高压电缆施工装置,并提出三种方案进行定性定量分析,选取最佳方案并对最佳方案进行细化确定基本结构。在现有工程中进行技术推广,并跟踪使用效果,证明新装置提高了施工效率,降低了施工成本,效益显著。     

起重机拼板不清根高效焊接及接头性能分析

为了解决拼板在焊接过程中的碳弧气刨清根、板材翻身导致焊接工序复杂、生产效率低下以及无法实行自动化焊接等问题,提出一种采用埋弧焊单面焊加陶瓷衬垫方法,板单元正面进行埋弧焊接,试板背面与陶瓷衬垫紧密贴合,从而实现拼板对接单面焊双面成形.研究结果表明,该埋弧焊接工艺满足100%RT和100%UT探伤,-20℃条件下冲击吸收功高于27 J,其力学性能结果符合标准要求.与传统工艺相比,该焊接工艺在保证其焊接质量的同时可简化生产工序,提高生产效率,降低生产成本,减少环境污染,实现绿色生产.     

A~2O氧化沟-混凝沉淀-反硝化深床滤池工艺在大型经开区污水处理中的应用

为降低污水排放对巢湖的污染,采用A~2O氧化沟-混凝沉淀-反硝化深床滤池组合工艺处理某大型经开区污水。分析了污水水质特征,论述了处理工艺的选择过程,介绍了工程设计参数和工程设计特点,以及实际运行情况。工程运行结果表明,该工艺出水水质稳定,可达到GB 18918—2002《城镇污水处理厂污染物排放标准》中一级A标准,其中TP、TN、NH3-N、CODCr的质量浓度分别不超过0.3、5、1.5和30 mg/L。     

FPGA-based test bed for measurement of AM/AM and AM/PM distortion and modeling memory effects in RF PAs

Using a field-programmable gate array (FPGA) development board, a digital signal processor (DSP) builder, and the phase-to-amplitude conversion principle, a low-cost system for measuring the amplitude-to-amplitude (AM/AM) and amplitude-to-phase (AM/PM) distortion curves of radio frequency (RF) power amplifiers (PAs) is presented. The state of the art based on the measurements and preliminary studies of AM/AM and AM/PM distortion curves is discussed. A full digital control of the test bed simulated/emulated in Matlab/Simulink is introduced to recalculate the known AM/AM and AM/PM measurements stored as look-up table (LUT). Finally, the low-cost system comprises the memory polynomial model (MPM) that involves the nonlinearity order and memory effects of real PAs.     

Characteristics of Fe2O3- coated LiCoO2 and LiCoO2 materials in radiation environments

Emergency power systems in nuclear power plants are necessary for supplying power for safe operation during emergencies. Lithium-ion batteries can be used in power systems, but they have issues with material degradation under irradiation. To solve these problems, the development of an electrode with high stability under irradiation is needed. The electrochemical stability of Fe₂O₃-coated LiCoO₂ (LCO) under irradiation was investigated. Fe₂O₃ is known to have a radiation shielding effect. The X-ray diffraction results for irradiated Fe₂O₃/LCO materials exhibited peaks of pristine LCO. In addition, Fe₂O₃ particles were observed to be well dispersed on LCO by scanning electron microscopy/energy dispersive X-ray spectroscopy. Electrochemical measurements revealed that the retention ratio of the discharge capacity for Fe₂O₃-coated/LCO was more stable than the capacity retention of non-coated LCO under irradiation.     

A comparative study of two proposed CCC-r charts for high quality processes and their application to an injection molding process

High-quality industrial processes, characterized by a low fraction of non-conforming items, require paying special attention to the statistical control methods employed since traditional Shewhart's control charts are no longer suitable. In this article, CCC-r charts are considered based on the cumulative count of conforming items inspected until r non-conforming items are observed. However, even though these charts have shown to be useful for high-quality processes, they are characterized by a biased average run length (ARL). In order to help engineers interested in this control methodology to select the best option, a computational study of statistical validation was performed to compare the two most outstanding procedures for the cases r = 2, 3, and 4. The performance was evaluated based on the ARL under control. The application of the CCC-r chart to a real process is shown with data from an automobile parts plant. Finally, analysis and discussion of the results are presented.     

FROM ARTIFICIAL LIFE TO REAL LIFE: COMPUTER SIMULATION OF PLANT GROWTH∗

Artificial life is by itself an important area of scientific investigation. However, this scientific discipline will be more effective if it can also help one to understand how natural living systems really work. It is argued that plant growth is an area where the studies in artificial life lend themselves to computer modeling of what really happens in nature. An approach for such modeling is described, and the initial results of implementing this approach for a corn plant growth are presented.     

Influence of ring-type internals on the solids residence time distribution in the fuel reactor of a dual circulating fluidized bed system for chemical looping combustion

The intensification of gas-solids contact in the fuel reactor of a chemical looping combustion system is enhanced with the installation of ring-type internals. This can be a key issue for achieving the necessary fuel conversion rates. Wedged rings, previously designed and tested, were found to increase the particle concentration in the counter current section of the fuel reactor and hence, to achieve a more homogeneous particles concentration along this zone. The present work investigates the effect of the mentioned internals on the residence time distribution of particles in the fuel reactor of a dual circulating fluidized bed system for chemical looping. The study was carried out in a cold flow model especially designed for the fluid-dynamic analysis of the system equipped with a recently developed residence time measurement device based on the detection of ferromagnetic tracer particles through inductance measurement. Ring internals proved the positive effect on the particles residence time, the residence time distribution is more symmetric and shows lower dispersion, the flow pattern is more plug-flow-like, these effects are intensified with the reduction of the aperture ratio of the rings. On the other hand, the upward particle transport in the counter-current zone of the fuel reactor also increases with the installation of the rings, increasing the bypass flow of solids through the fuel reactor's return loop (internal circulation). For high internal circulation rates the solids residence time distribution of the fuel reactor is dominated by the bypass effect. The findings may be used for focused design improvement of the investigated fluidized bed system.     

CFD simulation of fluidized bed reactors for polyolefin production – A review

This literature survey focuses on the application of computational fluid dynamics (CFD) in various aspects of the fluidized bed reactor. Although fluidized bed reactors are used in various industrial applications, this first-of-its-kind review highlights the use of CFD on polyolefin production. It is shown that CFD has been utilized for the following mechanisms of polymerization: governing of bubble formation, electrostatic charge effect, gas–solid flow behavior, particle distribution, solid–gas circulation pattern, bed expansion consequence, mixing and segregation, agglomeration and shear forces. Heat and mass transfer in the reactor modeling using CFD principles has also been taken under consideration. A number of softwares are available to interpret the data of the CFD simulation but only few softwares possess the analytical capability to interpret the complex flow behavior of fluidization. In this review, the popular softwares with their framework and application have been discussed. The advantages and feasibility of applying CFD to olefin polymerization in fluidized beds were deliberated and the prospect of future CFD applications was also discussed.