微电网保护与控制系统的设计与实现

为了能够掌握微电网整体运行状态,可靠切除微电网内各种类型故障,监测微电网的运行模式,实现微电网孤岛检测、孤岛运行和并网控制,提出并开发了利用微电网全域信息的保护与控制系统.该系统利用通信网络将工业控制计算机和微电网内的保护装置与并网控制装置相连,实现了微电网内保护的合理配置、保护装置与并网控制装置动作状态的实时监测、保护装置与并网控制装置的统一对时及远跳/远投控制、孤岛检测、并网控制及人机信息交互等基本功能.仿真测试结果表明,该系统总体结构简单,功能实用,能够保证微电网的安全稳定运行.     

超负荷保护装置故障浅析

阐述了超负荷保护装置是大型起重设备必备的安全设施。超负荷保护装置由测重感应装置（应变片）、信号处理电路和执行部分组成。解析了超负荷保护装置的组成及原理,对出现的故障现象进行了分析。     

Z-80单板机软件开发

本文介绍应用 FORTRAN 高级语言在 CROMEMCO 微机(简称主机)上为 Z-80 CPU一类单极机开发软件的方法。FORTRAN 与 Z-80汇编语言的目标程序模块可在主机上由 LINK 链接成为一个可执行程序。并可通过 COMMON 区交换数据,用外部量方式进行模块间相互调用。由于主机与单板机系统环境的不同,FORTRAN 程序库 FORLIB 不能用于单板机。文中着重介绍了将FORLIB 改写成为 SBCLLB,使之适应单板机的系统环境。SBCLIB 程序库具有下列功能:①用FORTRAN 语言写的程序在主机上与 SBCLIB 链接后就能移植到单板机上运行;②SBCLIB 接受LINK 程序的 S 开关命令;③SBCLIB 中的库程序可以在单板机的 RAM 区或 ROM 区运行;④SBCLIB 可由用户进行修改或扩充。以上工作方便了单板机的软件开发。     

对继电保护安全管理运行的分析

随着计算机硬件的飞速发展,电力系统对微机保护的要求也在不断提高,除了保护的基本功能外,还应具有大容量故障信息和数据的长期存放空间,快速的数据处理功能,强大的通信能力,与其他保护、控制装置和调度联网以共享全系统数据、信息和网络资源的能力,高级语言编程等,使微机保护装置具备一台Pc的功能。为保证系统的安全运行,各个保护单元与重合装置必须协调工作,因此,必须实现微机保护装置的网络化,这在当前的技术条件下是完全可行的。对维电保护装置安全管理运行的基本要求进行分析,阐述了继电保护安全管理运行措施分析。     

着火滞燃期微机检测系统及其应用

本文叙述了作者研制的柴油机着火滞燃期微机检测系统及其应用情况。该系统由传感器、信号处理电路、微型计算机及记录装置组成。传感器检出的信号送入信号处理电路后,经滤波、放大、整形及合成,成为等效于滞燃期的数字脉冲信号。将其输入单板机,运行汇编程序,连续采样并处理滞燃期数据。该系统检测精度高,在故障诊断及自控中使用便利。     

“WXB-41型微机距离保护装置”正式投产

由我校电力系电力系统及自动化教研室和南京电力自动化设备厂联合研制的新型继电保护装置——WXB-41型高压输电线路带加速功能的微机距离保护装置,1991年底通过由能源部主持的产品鉴定,现已投入正式生产.该保护装置由8086微处理器实现,除配有常规的零序方向电流四段以及三段式相间和接地距离保护外,还增设了保护线路全长的50%～60%、能快速切除故障的0段相间和接地距离保护,同时具有故障测距功能,适用于220kV及以下等级的输电线路,如果配合高频通道,亦可用于500kV超高压输电线路.     

基于组态软件平台的一体化工控机备自投装置方案设计

数字化、智能化、集成化、网络化是微机备自投装置的发展趋势,针对这一趋势,采用基于组态软件的一体化工控机来实现中低压一体化备用电源自动投入方案非常可行,将传统的微机型备自投装置内的数据采集和数据处理任务分配给外部的中压微机保护装置和低压智能断路器来完成,在这些智能保护装置之间采用Modbus通信,备自投装置中的CPU只需进行备自投逻辑判断,简化了程序的设计,也使得外部的接线更加简洁。     

具有绝缘监视和闭锁功能的电动机综合保护装置的研究

从电动机综合保护性能要求出发,采用多种数字集成电路,构成综保装置.重点介绍了全集成化的新型电动机综合保护装置的组成及其工作原理.该装置具有功能强、工作稳定、动作可靠、抗干扰性强,体积小、重量轻等优点.     

光电测速装置的设计

主要阐述了橇载光电测速装置的基本原理和具体结构及功能实现.整套装置由光电组件、主控部分及挡光板3部分组成.光电组件和挡光板为装置提供激光信号作为有用信号,主控部分对信号进行判断、采集、存储.     

土壤水份自动采控系统硬件设计与实施方法

土壤水份自动采控系统是由价格低廉的单板机、专用的土壤测试仪表及外部接口电路构成。可实现对数据的快速采集、存储和打印，并能准确地控制机泵的启闭，实现土壤水份自动采控之目的。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.