考虑分布式再生能源和储能的主动配电网可靠性评估

随着主动配电网技术的逐步发展和应用,针对主动配电网的各项评估技术也需要进一步研究。由于主动配电网在网络结构、潮流流向等方面与传统配电网有很大区别,因此针对主动配电网的评估方法也与传统配电网不同,提出了一种考虑分布式再生能源和储能的主动配电网可靠性评估方法。首先运用蒙特卡洛模拟法进行系统状态选择,再基于不同网络类型,采用改进的前推回代潮流计算方法进行潮流计算与潮流平衡调整,进而计算各项评估指标,获取综合评估值。通过对9个方案进行可靠性评估,验证了所提方法的有效性

Influence of Intercalated Li on Electronic Structures and Optical Properties of V_2O_5

采用第一性原理局域密度近似法计算了V2O5的电子态密度和能带结构以及Li嵌入后对其电子结构和光学性质的影响。计算结果表明,V2O5是间接带隙半导体,Li的嵌入并没有改变其电子的跃迁方式。但Li的嵌入使得V2O5导带能量下移,禁带宽度减小,导带中原有的劈裂被分裂的能级填满;同时致使价带出现展宽。电子态密度计算结果表明Li的嵌入对临近的O和V的电子结构有较大的影响。Li2s电子的注入提高了V2O5的费米能级并导致其进入导带。由于价带中的电子只能跃迁到费米能级以上的导带空能级,这致使体系实际的光学带隙增大。同时随着Li注入量的进一步增加,价带的展宽更为明显,费米能级亦呈升高的趋势,使得光学带隙随着Li注入量的增加而增大。The density of states and band structures of α-V2O5 and Li-intercalated V2O5 (LixV2O5, x= 0.5 and 1.0) have been studied using a first-principles calculation based on density function theory with the local density approximation. The results indicate that V2O5 is an indirect-gap semiconductor; the intercalation of Li will not change its way of electron transition. While, the intercalation of Li lowers the energy of conduction band, and then narrows the band gap. At the same time, due to the intercalation of Li, the split-off in the conduction band of V2O5 disappears because of the split of conduction band. The Fermi level of LixV2O5 increases dramatically due to the electron transfer from Li 2s to the V2O5 host, which is probably the main reason why the optical band-gap augments with the Li intercalation.国家重点基础研究发展规划(001CB610505);; 国家自然科学基金(60376015,60336020);; 福建省青年人才创新基金(2005J005)资助项目~

Study on organochlorine pesticide and PCBs at surface water in Xiamen Harbour

利用GC -ECD对厦门西港 1998年 7月取得的 9个站位表层水体中的 18种有机氯农药 (HCHs ,DDTs等 )和 12种多氯联苯 (PCBs)进行分析。其中有机氯农药的浓度范围 6 .6 0～ 32 .6ng/L(其中HCHs:3.5 1～ 2 7.8ng/L ,均值 8.5 7ng/L ;DDTs:0 .95～ 2 .2 5ng/L ,均值 1.45ng/L) ,多氯联苯的浓度为 0 .0 8～ 1.6 9ng/L ,同国内外其他港口海区相比较 ,其污染程度相对较低。同时 ,对有机氯污染的分析表明 ,发现近年来仍有有机氯的污染输入 ,其农药的使用主要集中在六六六和滴滴涕上 ;多氯联苯和有机氯农药在厦门西港有着相似的分布及来源特征。organochlorine pesticides and 12 polychlorinated biphenyls(PCBs) at the sruface water in Xiamen Harbour were determined. The range of organochlorine pesticides was 6.60～32.60 ng/L, and the PCBs concentrations were 0.08～1.69 ng/L. Compared with the results of other harbor and estuaries, it showed that the contamination for organic chlorine pollutants was more slight than those of others. At the same time, it was found that organochlorine pesticides and PCBs have the similar geological destribution and resources.福建省自然科学基金!项目 (D9810 0 0 3

Evaluation and Fate of the Organic Chlorine Pesticides at the Waters in Jiulong River Estuary

1999 0 6,对九龙江口 1 5个站位的表层水 ,1 3个站位的间隙水进行了 1 8种有机氯农药的测定结果表明 ,有机氯农药总含量在表层水中的浓度范围为 51 3～ 2 4 79ng L ;在间隙水中的浓度范围是 2 66～ 33355ng L .对不同有机氯的含量在各站位的分布特征进行了探讨 ,发现Methoxychlor(甲氧滴涕 ) ,EndosulfanSulfate(硫酸硫丹 ) ,Endrinaldehyde(乙醛异狄氏剂 )以及EndosulfanII(硫丹 ) ,Dieldrin(狄氏剂 ) ,Deta HCH和Beta HCH 7种有机氯农药在 1 8种有机氯农药中都占主要部分 ;九龙江口的六六六的含量顺序 :β >δ α >γ ;对于滴滴涕 ,表层水中的含量 :DDE DDD >DDT ;间隙水中的含量 :DDE DDT >DDD ,二者DDE的含量都在总DDTs的 50 %以上 ,说明环境中的DDTs主要降解为DDE ;九龙江口有机氯农药随着盐度梯度 ,在河口中呈去除趋势 ;且间隙水中有机氯农药比表层水中的浓度高 ,说明其倾向于吸附在沉积物颗粒上 ,其浓度差使得有机污染物可能通过再悬浮等过程从底层向上层迁移 .九龙江口的有机氯农药污染与其他港湾相比 ,污染水平相当 ,部分站位水质有机氯农药 (HCHs和DDTs)超过国家一类水质的标准 .Organochlorine Pesticides at the water(surface water and porewater) in Jiulong River Estuary were determined. The range of organochlorine pesticides at surface water was 51.3～2479ng/L, and the concentration in porewater was 266～33355ng/L. The results showed that the organochlorine pesticides were removed in the estuary and the sediments were the reservior of the organochlorine pesticides. Compared with the results of other harbor and estuaries , it showed that the contamination for organic chlorine pollutants in Jiulong River Estuary was similar to those of others. At the same time,the risk of organochlorine pesticides in the estuary was evaluated.1998年教育部重点项目、基金委资助留学人员短期回国工作讲学专项基金!项目联合资助 (4 9910 76 0 74

The trends and characteristics of organochlorines pollution in surface sediments of Xiamen Western Bay

利用GC ECD对厦门西港 1 998年 7月取得的 8个站位表层沉积物中的 1 8种有机氯农药 (HCHs,DDTs)等和 1 2种多氯联苯 (PCBs)进行分析 .其中有机氯农药的浓度范围ND(未检测出 )— 0 58ng/g(其中HCHs和DDTs的含量分别为ND—0 1 4ng/g与ND— 0 0 6ng/g) ,多氯联苯的浓度为ND— 0 32ng/g ,与 1 986、1 993年的厦门西港的分析结果相比较 ,污染程度明显降低 ;说明近年来的厦门的有机污染得到逐步控制 ,也与有机物随时间推移逐渐详解有关 ,分析表明多氯联苯和有机氯农药在厦门西港有着相似的分布特征 .The contents of 18 organochlorine pesticedes and 12 polychlorinated biphenyls(PCBs) in suface sediments from Xiamen Western Bay were analyzed by GC\|ECD. The range of organochlorine pesticides was ND—0 58?ng/g,and the PCBs were ND—0 32?ng/g.Compared with the results of Xiamen Harbor in 1986 and 1993, it showed that the pollution of organochlorines decreased gradually along the time, in Xiamen Harbor became and the contamination was more slightly than that of other Harbors or Estuaries. At the same time, it was found that the geological distributions of organochlorine pesticides and PCBs, also the HCHs and DDTs were similar to each other, which indicated that the polltion was cansed by a same source

铒、氧共注a-Si:H和a-SiCx:H的1.54μm光致发光

在a-Si:H和a-SiCx:H中共注稀土铒和氧。300 ℃和400 ℃热退火后,测得了来自发光中心Er~(3+)内层4f电子跃迁的1.54 μm光致发光。400 ℃是较好的退火温度。随着碳含量的增加,发光强度逐渐减弱,这可能是由于碳的引入减弱了间隙氧退火时的迁移能力所致

design and implementation of foundational development framework for jca adapter

针对当前JCA适配器开发难度大、效率低问题,提出一种JCA资源适配器的基础开发框架。该框架运用良好的设计模式,抽取并实现JCA规范中的系统契约和应用契约的核心部分,从而使开发人员只需实现和具体企业信息系统密切相关的功能特性,给出一套基于该基础框架的开发工具进行适配器的开发。实验结果表明,该框架能够有效地提高适配器的开发效率和质量

谈节能降耗中热能与动力工程的现代实际应用

随着经济的发展，环境污染和资源消耗成为中国现在发展中不容忽视的问题，对中国的可持续发展起到了一定的阻碍作用，所以节能降耗已经成为社会生产中的必要话题。电能在现今社会生产和生活中起到了相当重要的作用，为此中国应加大电厂的建设力度，与此同时，随着电厂的扩张，资源消耗和环境污染的问题也越来越严重。因此，论文就节能降耗和动力工程的实际应用开发展开了深度分析，希望对相关人士有所帮助。</jats:p

电气工程中自动化人工智能的应用

随着信息科学技术的不断发展，人工智能技术得到了重大突破，并逐渐进入人们的生活中，为各行各业带来了一次新的改革。基于此，论文介绍了将电气工程与人工智能结合的必要性，讲述了人工智能应用的优点，介绍了两者结合的具体应用，以供参考。</jats:p

热电厂中热能与动力工程的有效应用

随着目前中国用电量的增长，必须要保证用电的稳定以及充足，而热电厂中的热能与动力工程能够很好地提高能源利用率，所以文章就热能和动力工程在实际运行过程当中的问题进行研究讨论，并且提出相关建议。</jats:p