Multi-objective planning and optimization of microgrid lithium iron phosphate battery energy storage system consider power supply status and CCER transactions

Lithium iron phosphate battery (LIPB) is the key equipment of battery energy storage system (BESS), which plays a major role in promoting the economic and stable operation of microgrid. Based on the advancement of LIPB technology and efficient consumption of renewable energy, two power supply planning strategies and the china certified emission reduction (CCER) model are proposed respectively. Based on it, the multi-objective planning optimization model with economic benefits, environmental benefits and power supply stability as the objective function is established for the first time, and the Newton Weighted Sum Frisch method (NWSFA) solution model is adopted. In the planning process, rain flow counting method is used to research the life of BESS, which improves the accuracy of energy storage annual cost calculation. A park in northern China is taken as a case study to demonstrate the application of this model. The simulation results show that the annual economic operating cost of BESS is decreased by 18.81%, the energy supply reliability is increased by 0.15%, and the optimal electricity price adjustment ratio of the system is 15%.     

关于注册建筑师继续教育问题

针对当前勘察设计行业注册建筑师继续教育的情况进行调查和总结,并提出几点关于各专业注册师施行继续教育的改进建议。     

执业资格体系下土木工程专业课程体系改革

根据建设行业执业资格制度的特点和要求,突出建立和完善与执业资格体系相适应的土木工程专业课程体系,强化实践环节与技能掌握,改革培养方案、授课内容、授课方式,以提高土木工程专业学生的实践能力,培养适应社会需求的应用型专业人才.     

钒氮合金标准样品研制中的数理统计方法应用

通过对钒氮合金标准样品研制过程中的样品均匀性检验、定值结果的计算和误差的统计分析,阐述了数理统计方法在标准样品研制过程中的实际应用,为冶金标准样品研制者提供一个可以借鉴的参考样本。根据GB/T 15000《标准样品工作导则》和YB/T 082《冶金产品分析用标准样品技术规范》对标准样品研制的要求并结合实际,采用了方差分析法对标准样品均匀性进行判断,夏皮罗-威尔克方法用于考查定值数据的正态性,科克伦、格拉布斯和狄克逊检验法对定值数据的可疑值和离群值进行了检查和筛选,t检验对标准样品稳定性进行了判定,确保了钒氮合金标准样品的均匀性、稳定性及定值数据的准确性,使钒氮合金标准样品成为合格的标准参考物质。     

车用汽柴油中硫成分分析标准物质的研究进展

随着世界各国对环境问题的普遍重视,以及汽柴油标准的不断升级和油品质量检测技术的逐步完善,我国对低硫含量汽柴油标准物质的需求日趋迫切。油品中硫含量过高,大大降低了催化转换器中催化剂效率,增加了车辆污染物的排放量。含硫汽柴油标准物质的研制,是制定汽柴油国家强制标准的急需,是有效控制大气污染的急需,是保障交通安全的急需,对元素分析仪器的校准、汽柴油硫含量检测和定值等方面起到极其重要的作用。旨在通过对国内外车用汽柴油质量标准硫含量现状和发展趋势的分析,拟为汽柴油中硫元素标准物质的研制及快速准确地对汽柴油中硫含量的检测,提供必要依据和借鉴。     

焊接检验师在海洋钢结构焊接过程中的角色与行为

焊接是钢结构形成过程中一个极其重要的环节,作为焊接质量的重要保证,焊接检验师在钢结构生产的焊接质量控制中扮演着关键角色.由于海洋钢结构受到水文、气候等诸多因素影响,焊接质量要求更高.结合海洋钢结构工程项目中检验监理的亲身经历,阐述了焊接检验师在钢结构焊接过程中担当的角色和行为,称职的焊接检验师在项目焊接质量控制中担当着...     

Vector data flow analysis for SIMD optimizations on OpenCL programs

Multi‐core systems equipped with micro processing units and accelerators such as digital signal processors (DSPs) and graphics processing units (GPUs) have become a major trend in processor design in recent years in attempts to meet ever‐increasing application performance requirements. Open Computing Language (OpenCL) is one of the programming languages that include new extensions proposed to exploit the computing power of these kinds of processors. Among the newly extended language features, the single‐instruction multiple‐data (SIMD) linguistics and vector types are added to OpenCL to exploit hardware features of the accelerators. The addition makes it necessary to consider how traditional compiler data flow analysis can be adopted to meet the optimization requirements of vector linguistics. In this paper, we propose a calculus framework to support the data flow analysis of vector constructs for OpenCL programs that compilers can use to perform SIMD optimizations. We model OpenCL vector operations as data access functions in the style of mathematical functions. We then show that the data flow analysis for OpenCL vector linguistics can be performed based on the data access functions. Based on the information gathered from data flow analysis, we illustrate a set of SIMD optimizations on OpenCL programs. The experimental results incorporating our calculus and our proposed compiler optimizations show that the proposed SIMD optimizations can provide average performance improvements of 22% on x86 CPUs and 4% on advanced micro devices GPUs. For the selected 15 benchmarks, 11 of them are improved on x86 CPUs, and six of them are improved on advanced micro devices GPUs. The proposed framework has the potential to be used to construct other SIMD optimizations on OpenCL programs. Copyright © 2015 John Wiley & Sons, Ltd.     

An improved and provable self‐certified digital signature scheme with message recovery

This paper presents a self‐certified digital signature scheme with message recovery that is proven to be secure. So far, many schemes of this kind have been proposed to keep message secret in the transmission. But Zhang et al. has proposed the man‐in‐middle attack to Shao's self‐certified signature scheme, which is based on discrete logarithm. The attacker can make a new signature by using an old one, but the reason of such man‐in‐middle attack was not referred. We present the scheme of Yoon et al., which is also based on discrete logarithm, that cannot resist man‐in‐middle attack either, give the analysis of the attack, and propose a new scheme. The proposed scheme can resist forgery attack in the random oracle model and avoid message leakage, the man‐in‐middle attack, and meanwhile has several security characters. Compared with some self‐certified schemes, our scheme is the best because of the time cost. Copyright © 2013 John Wiley & Sons, Ltd.     

硅铝铁标准物质的研制

根据我国硅铝铁标准物质的需求,制备了2种硅铝铁标准物质。按照硅铝铁合金技术标准的要求,选取表面无气孔、无杂物的不同含量的硅铝铁合金作为原材料,经过去除外皮、夹杂,分选,制成直径40～50 mm的块状样品,用颚式破碎机粉碎至粒度小于2 mm的颗粒,充分混匀后再用制样机反复研磨,使物料全部通过0.125 mm（120目）的筛网。对制得的标准物质进行均匀性和稳定性检验,结果表明该标准物质具有良好的均匀性与稳定性。采用多家实验室对标准物质中的硅、铝、铁3个元素进行定值分析,分析数据经格拉布斯法、科克伦准则和夏皮罗-威尔克法检验,显示研制的标准物质的正态检验值均大于置信概率95 %的列表值,定值数据均呈正态分布或近似正态分布。     

浅谈建筑工程检测实验室计量认证规范化管理

以实验室规范化管理工作中积累的一些经验为基础,对实验室计量认证工作进行了认真的探讨,以期探索出一种操作性强并具有广泛普及意义的＂实验室规范化管理方法＂。