A floating-point genetic algorithm for solving the unit commitment problem

This paper proposes a floating-point genetic algorithm (FPGA) to solve the unit commitment problem (UCP). Based on the characteristics of typical load demand, a floating-point chromosome representation and an encoding–decoding scheme are designed to reduce the complexities in handling the minimum up/down time limits. Strategic parameters of the FPGA are characterized in detail, i.e., the evaluation function and its constraints, population size, operation styles of selection, crossover operation and probability, mutation operation and probability. A dynamic combination scheme of genetic operators is formulated to explore and exploit the FPGA in the non-convex solution space and multimodal objective function. Experiment results show that the FPGA is a more effective technique among the various styles of genetic algorithms, which can be applied to the practical scheduling tasks in utility power systems.     

谈高职会计人才职业素质的培养

市场经济的不断发展对会计人才的素质要求越来越高,高职会计人才的职业素质培养至关重要。高职会计教育应以新的思路接受挑战,将职业素质教育贯穿于专业人才培养全过程。     

浅谈大学生择业与职业生涯规划

阐述了职业生活和大学生职业生涯规划的重要性,论述了择业方式对大学生择业的影响,分析了大学生择业价值取向的特点。     

A new high-performance liquid chromatographic/electrospray ionization tandem mass spectrometric method for the simultaneous determination of cyclophosphamide, methotrexate and 5-fluorouracil as markers of surface contamination for occupational exposure monitoring

A new high-performance liquid chromatographic/electrospray ionization tandem mass spectrometric (HPLC/ESI-MS/MS) method was developed for the simultaneous quantification of 5-fluorouracil (5FU), methotrexate (MTX) and cyclophosphamide (CP) in environmental samples. These compounds, commonly used in the treatment of cancer, are recognized as genotoxic. In order to estimate the occupational exposure of hospital personnel handling these drugs, wipe samples were taken from the working surfaces and directly analyzed (with trophosphamide as internal standard) using a reversed-phase capillary column and MS/MS detection. This is the first HPLC/MS/MS method for the simultaneous determination of 5FU, MTX and CP. The present method offers high sensitivity, with detection limits of 1.1 microg l(-1) for MTX and CP and 33.3 microg l(-1) for 5FU, avoiding any sample preconcentration procedure. Rapidity, specificity, high accuracy (mean values between 92.4 and 99.9%) and precision (mean RSD values between 3.4 and 12.1%) make the method suitable for the routine determination of these three antineoplastic drugs.     

改进GA算法的电力系统机组优化组合研究

提出了一种新的基于实数和二进制数统一编码的改进遗传算法.把机组组合问题分解为两个优化子问题,分别对其优化.应用实数编码来模拟功率并用实数遗传算法解决负荷经济分配问题,同时结合二进制编码模拟机组启停状态,解决了机组优化组合的0-1混合整数非线性规划问题.本算法运用到模拟10台机组的优化组合研究中,取得了很好的效果.     

体育教师职业倦怠的成因与对策研究

职业倦怠是职业压力的一种,指在职业环境中,因情感的长期投入导致人身体上、情感上、心理上耗竭的状态.运用文献资料法和访谈法,对体育教师职业倦怠进行分析.研究结果表明,体育教师倦怠来源于社会、学校,来源于体育教师的职业适应、职业人际关系以及个体因素等.提出缓解体育教师职业倦怠的对策,以全面提高体育教师的心理健康.     

区域在业人口分布格局变动分析——以浙江省为例

浙江省在业人口区域分布演进具有渐变和突变并存的特征,不同区域在业人口集中与分散变动程度有平缓与剧烈之别,并且集中分布区域演进脉向各异——稳定、收缩与扩展交叉。经过渐变与突变并存的变动,浙江省在业人口具有在低海拔和临海地区集中分布的远东地域性特征。经济因素是在业人口集中与分散差异分布的直接原因,自然环境因素是基础性成因,基于经济和自然环境差异的在业人口不均衡分布,便成为一种必然,因而在实践上要避免在业人口分布均衡即合理的思想,继续鼓励在业人口的合理流动。     

提高高校图书馆员职业能力初探

分析了高校馆员面临的压力,探讨了高校馆员应具备的职业能力,并结合实际提出了提高馆员职业能力的途径。     

Third-Generation Solar Cells: Toxicity and Risk of Exposure

Solar energy is considered clean energy, and its use is predicted to increase in the near future. Most installed units today are crystalline solar cells, but the field is in constant development, and when the first dye sensitized solar cell was published by Grätzel and O'Reagan a new, third-generation, solar power was born. Highly toxic metals are used to produce the photovoltaic units today, and with the predicted increase in solar cell installation, the human health hazards of these panels could become an issue. Additionally, many of these materials are used in their nanoform, which is associated with an additional risk. In this article, we discuss the technology behind the third-generation solar cells with its valuable use of nanotechnology as well as the possible health hazard when such nanomaterials are used in solar power units. We will show that the main exposure will occur either during the development and production phases or at the end-of-life stage of the solar cells, where toxic material can leach into landfills, and subsequently into the environment and impact the ecosystem directly, or humans indirectly through edible plants or drinking water.     

网络环境下图书馆职业道德建设与图书馆服务

图书馆职业道德是图书馆员履行本职工作中对社会对读者所应负的责任和义务。阐述了加强图书馆职业道德建设的必要性,介绍了图书馆职业道德的主要内容,提出了加强图书馆职业道德建设的措施。