XTRANS:一个XML与关系数据相互转换系统

可扩展标记语言XML已逐渐成为了WWW中业务数据的交换标准,利用XML文档作为载体可以在各种异构的业务系统间交换信息,具有灵活、方便、快速的特点。该文提出了一种XML与传统关系数据相互转换的系统框架,XTRANS就是在此基础上实现的一个XML与关系数据的转换系统。系统借助一个映射文件来定制系统的转换细节,能够实现保序的转换。通过扩展映射文件可以使系统满足用户的不同需求。     

基于多目标的未来桥梁工程师培养与课程体系建设

课程体系是大学人才培养和实现既定培养目标的主要载体。在总结美国、德国、苏联的工科人才培养模式以及我国工程教育发展历程的基础上,结合我国的教育国情以及目前的交通行业发展需求,提出了未来桥梁工程师纵向三级人才培养和横向不同桥梁专业人才培养的“多目标”培养思路,并分析了其与我国高等学校土木工程专业本科教育培养目标、国际CDIO工程教育理念、行业人才培养需求的一致性;最后,建立了基于中南大学“通识教育+学科教育+专业教育+个性培养”这个纵向链条的桥梁工程本科教学课程体系,并制定了桥梁工程专业横向课程群,完整构建了三级人才和不同桥梁专业人才的培养模式,从而实现基于多目标的未来桥梁工程师培养。     

ADSP21992在综合微机保护装置中的应用

系统地介绍了一种成功研制的基于DSP(数字信号处理器)与CPLD(复杂可编程逻辑器件)的小体积高性能综合微机保护装置，该装置不仅实现了实时测控和电流保护的功能．还集成了零序保护、距离保护和重合闸保护等功能，是集控制、测量、远动、保护、故障录波等功能于一体的分散式变电站自动化系统中的单元式模块。重点讲述了软硬件的设计与实现，最后给出了该装置在电网实验测试中所达到的性能。     

Investigations concerning seismic response control of self-anchored suspension bridge with MR dampers

To mitigate the seismic response of self-anchored suspension bridges, equations of motion governing the coupled system of bridge-magneto-rheological (MR) dampers subject to seismic excitation are formulated by employing the phenomenological model of MR dampers. A corresponding computer program is developed and employed for studying the seismic response control of a self-anchored suspension bridge with a main span of 350 m. The effect of variable current and number of dampers on seismic response control is investigated. The numerical results indicate the longitudinal displacement of the tower top and bridge girder decrease with the increase in input current and number of MR dampers attached longitudinally at the tower-girder connections, and the internal forces of the tower are effectively attenuated as well. It appears that small electronic current (0.5 A in this study) may sufficiently attenuate the seismic responses for practical engineering applications. __________ Translated from China Civil Engineering Journal, 2006, 39(11): 84–89 [译自: 土木工程学报]     

沙88井四开井段钻井完井技术及复杂情况的处理

沙88井在奥陶系下统鹰山组地层钻遇5．70m的大溶洞，钻井液有进无出，堵漏13次均无效，漏失钻井液及堵漏浆2748m^3。后采用欠平衡压力强行钻进技术钻完四开井段，Ф177．8mm尾管固井采用“穿鞋戴帽”固井技术，有效封固了漏失层上下井段及漏失层井段。详细介绍了沙88井四开井段复杂井况下的堵漏、强行钻进、固井等技术措施及施工工艺。     

Ni1−xCoxSe2?C/ZnIn2S4 Hybrid Nanocages with Strong 2D/2D Hetero-Interface Interaction Enable Efficient H2-Releasing Photocatalysis

Designing a semiconductor-based heterostructure photocatalyst for achieving the efficient separation of photogenerated electron-hole pairs is highly important for enhancing H₂ releasing photocatalysis. Here, a new class of Ni_1−xCo_xSe₂–C/ZnIn₂S₄ hierarchical nanocages with abundant and compact ZnIn₂S₄ nanosheets/Ni_1−xCo_xSe₂^ C nanosheets 2D/2D hetero–interfaces, is designed and synthesized. The constructed heterostructure photocatalyst exposes rich hetero-junctions, supplying the broad and short transfer paths for charge carriers. The close contacts of these two kinds of nanosheets induce a strong interaction between ZnIn₂S₄ and Ni_1−xCo_xSe₂ C, improving the separation and transfer of photo-generated electron-hole pairs. As a consequence, the distinctive Ni_1−xCo_xSe₂ C/ZnIn₂S₄ hierarchical nanocages without using additional noble-metal cocatalysts, display remarkable H₂-relaesing photocatalytic activity with a rate of 5.10 mmol g⁻¹ h⁻¹ under visible light irradiation, which is 6.2 and 30 times higher than those of fresh ZnIn₂S₄ nanosheets and bare Ni_1−xCo_xSe₂ C nanocages, respectively. Spectroscopic characterizations and theory calculations reveal that the strong interaction between ZnIn₂S₄ and Ni_1−xCo_xSe₂ C 2D/2D hetero-interfaces can powerfully promote the separation of photo-generated charge carriers and the electrons transfer from ZnIn₂S₄ to Ni_1−xCo_xSe₂ C.     

时频分析在苏里格地区含气性检测中的应用

地震波通过含气层时高频能量将发生明显衰减,利用地震波高频能量的衰减可预测含气层。首先对比了短时傅里叶变换、小波变换、广义S变换和匹配追踪分解等4种时频分析方法,证实了匹配追踪分解时频分析具有较高的时间域分辨率和频率域分辨率;其次通过模型正演验证了地震波通过含气层时具有高频衰减的特征及高频衰减梯度方法可反映高频能量衰减;最后运用匹配追踪分解法对苏里格气田西部一块三维地震工区进行了时频分析,并应用高频衰减属性进行了含气性检测。其预测结果与钻井的含气性符合率较高,证明该含气性检测方法是可行的。     

ICP-AES测定碳纤维材料的碱金属、碱土金属元素

研究了高纯碳纤维材料中杂质碱金属碱土金属(K、Na、Ca、Mg)四元素的样品前处理方法及在等离子发射光谱上测试的条件等。所得到的测试方法在实际工作中应用,结果满意。     

Development and applications of rescue robots for explosion accidents in coal mines

It is essential to provide disaster relief assistance after coal mine explosions. Often, it is life‐threatening for rescuers to enter an accident scene blindly; therefore, a coal mine rescue robot (CMRR) has been developed. However, the application of the CMRR has not proven satisfactory after decades of development. To solve this problem, we summarize the reasons for this disappointing state and address the technical challenges of the CMRR. Based on these reasons and the associated technical challenges, two generations of tracked robots have been developed. The China University of Mining Technology‐V (CUMT‐V) (A) robot was first developed and its walking system, body support system, communication system, environmental awareness system, and control system are described in detail. A performance test was performed on the CUMT‐V (A) robot and some problems were encountered. To address these problems, we designed the CUMT‐V (B) robot. The field test was conducted in Shanxi province, China, in August 2016. The application results show that the robot has good adaptability to complex terrain and high reliability in terms of environmental awareness and data transmission. In conclusion, the robot is nearing practical applications.     

塔河油田优快钻井技术实践与认识

塔河油田上部地层疏松、可钻性好,钻井过程中易出现缩径阻卡现象;下部地层易剥落掉块、坍塌严重,易出现井下复杂情况或事故,且存在垂直裂缝或溶洞,易发生钻井液漏失。为此,塔河油田开展了优快钻井配套技术研究与应用,包括井身结构优化设计、钻头选型、井下动力钻具配合高效钻头快速钻进、防斜打快以及优质钻井液体系5项技术,使塔河油田钻井效率得到了极大提高——在保证成井率的前提下,平均机械钻速提高40%以上,平均钻井周期缩短30%以上,三叠系、石炭系地层井径扩大率控制在10%以内,单井套管节约150 t以上,单井钻井成本节约200万元以上,取得了显著的经济效益。