神华粤电珠海港装船采样系统设备缺陷分析与改造

装船线煤样的采集是制样和化验的前提,采样的目的是为了获取最具代表性的煤样,并通过化验反映煤炭的根本属性,为入厂煤炭的验收和结算提供依据。为进一步保障买卖双方的利益,保证采样系统的精确性显得尤为重要。现针对广东地区雨季湿黏煤容易堵料的情况,在原有装船采样系统设备的基础上进行了优化,并针对极端天气情况制定了一套应急改造方案,旨在提高自动采样系统的运行及使用时长,提高采制样精度。

新疆棉花的发展现状与质量提升对策

探讨新疆棉花的发展机遇和提升质量的对策。以新疆棉花为研究对象,分析了新疆棉花的生产现状和存在的质量问题,讨论了新疆棉花质量面临的机遇和挑战,并提出了提升新疆棉花质量的相应对策。认为:针对当前新疆棉花产业发展,必须转变发展思路,从数量增长型转变为质量增长型;调整产业政策,完善推广目标价格与棉花质量挂钩;加强标准引导,将籽棉含杂纳入分等计价收购质量指标;实施创新驱动,研发新型适用轧花机,改进棉花采收加工工艺;立足棉花质量,建立标准化和规模化、自动化、智能化、一体化的质量管理监测系统。

Effects of Different Vibration Intensities Harvesting on Photosynthesis System Parameters of Lycium barbarum L. Trees with Harvest Machine

The effects of different vibration intensities harvesting on photosynthesis system parameters of Lycium barbarum L. tree with harvest machine were researched. The result showed that the photosynthetic rate, transpiration rate, stomata conductance and intercellular CO2 concentration of L. barbarum tree＇s leaves under different treatment during different periods have no significant difference compared with contrast. It indicates that there is no significant effect on photosynthesis system parameters of L. barbarum tree＇s leaves with harvest machine.

Factors affecting thin coal seam shearer drum coal-loading performance by a model test method

To solve the problem of a low coal-loading rate being exhibited by the drum shearer on Chinese thin coal seams,systematic tests and research were performed to study the pivotal factors’influences on drum coal-loading rate using a model test method.The effects of the drum hub diameter,cutting depth,vane helix angle,drum rotation speed and hauling speed on drum coal-loading rate were determined under circumstances of coal-loading with drum ejection and pushing modes,and reasons for these phenomena were analyzed.The results indicate that the influence of the drum cutting depth on the drum coal-loading rate is the most significant.The parameters of hub diameter,drum rotation speed and hauling speed can influence the drum coal-loading rate by cutting the coals’filling rate in the drum.The parameters of vane helix angle and drum rotation speed can influence drum coal-loading rates by influencing the ratio of cutting coals’tangential and axial speed in the drum.The coal-loading rate with drum ejection is clearly higher than that observed with drum pushing.Research in this study can provide support to design the drum structure and select drum operational parameters for a thin coal seam shearer.

Building a Secure Block Ciper on Small and Non- Binary Domain

We design a practical and provablysecure block ciper over small domain and non-binary inputs,which is also can be considered as a pseudorandom permutation on N elements.Our work is based on a relation we found between the small domain ciper and the negative hypergeometric probability(NHG) distribution.We prove that our block ciper achieves ideal security,that is,it is indistinguishable from a random permutation even if the adversary had already observed N plaintext-cipertext pairs.In particular,we initiate an efficient and sufficiently precise sampling algorithm for negative hypergeometric distribution.

Exhaust gas energy recovery system of pneumatic driving automotive engine

Almost the same quantity to net output work of energy has been carried out and wasted by exhaust gas in typical automotive engine. Recovering the energy from exhaust gas and converting to mechanical energy will dramatically increase the heat efficiency and decrease the fuel consumption. With the increasing demand of fuel conservation, exhaust gas energy recovery technologies have been a hot topic. At present, many researches have been focused on heating or cooling the cab, mechanical energy using and thermo-electronic converting. Unfortunately, the complicated transmission of mechanical energy using and the depressed efficiency of thermo-electronic converting restrict their widely applying. In this paper, a kind of exhaust gas energy recovery system of pneumatic driving automotive engine, in which highly compressed air acts as energy storing and converting carrier, has been established. Pneumatic driving motor can produce moderate speed and high torque output, which is compatible for engine using. The feasibility has been certificated by GT-Power simulation and laboratory testes. The technologies about increasing recovery efficiency have been discussed in detail. The results demonstrated that the in parallel exhaust gas energy recovery system, which is similar to the compound turbo-charger structure can recovery 8 to 10 percent of rated power output. At last, a comprehensive system, which includes Rankine cycle based power wheel cycle unit etc., has been introduced.

An Automatic Dust Removal Device Based on SCM for Solar Panels

This paper introduces a set of automatic dust removal device for street lamp solar panels. The device realizes the automatic dust removal for street lamp solar panels by three steps consisting of data acquisition, automatic control and mechanical dust removal. Our scheme is as follows, according to the comparison between the actual power generation and the relatively ideal condition of power generation of solar panels, we selectively conduct dust removal operation to panels. The paper demonstrates the feasibiliW of the technology based on the example of street lamp solar panels （40w）. According to the calculation, the solar panels equipped with our device will greatly improve the power generation efficiency of solar panels, which means there will be 32 more degrees generated every year. Extension and application of the technique device will be beneficial for the improvement of solar panels power generation efficiency and the extension of the service life of the panels.

Load Frequency Control of a Two Area-Power System with Non-reheat Turbines by SMC Approach

Load frequency is an important issue in power system operation and control. In this paper, load frequency control for suppression frequency deviation in an interconnected power system with nonlinearities using SMC （sliding mode control） is studied. The governor dead band and GRC （generation rate constraint） is considered in this article. Digit simulations for both two areas and three areas power system with non-reheat turbines are provided to validate the effectiveness of the proposed scheme. The results show that, the robustness of the control method under parameters variation and different load disturbances with the SMC technique.