浅析采空区探查的安全技术管理

受小煤窑开采的破坏,在露天煤矿的开采中,对采空区探查的安全技术管理非常重要并直接影响到安全生产。根据采空区破坏范围和形态,采用科学、合理的探查手段和方法探查采空区,能取得较好的爆破效果。     

工业自动化控制系统的设计

工业生产过程自动化系统经过长期不断的发展,特别是在充分利用计算机技术的基础上取得了很大的进步,在生产过程中已发挥其重要作用,成为生产过程安全、稳定、自动化运行不可缺少的工具。本文从工业生产自动化现状趋势、生产过程自动化系统和生产管理系统、软PLC和软DCS、生产过程控制和管理软件的融合等方面展开论述．从工业生产与自动化控制融合环节提出工业自动化控制系统设计的独特见解。     

基于ADSP2181的实时语音采集与处理板的原理与组成

把ＰＣ机接口技术与ＤＳＰ芯片技术相结合,设计了一块实时语音采集与处理板。由于采用了具有３０ｎｓ指令周期的ＡＤＳＰ２１８１芯片及专用的Ａ／Ｄ,Ｄ／Ａ芯片,本板能够对多种语音算法如Ｇ７２８,Ｇ７２９,Ｇ７２３,ＭＰＥＧ音频等算法实现实时编解码处理。由于这块板对外具有灵活方便的数字接口,它也可用于其他高速数字信号采集与处理应用的场合。     

A Theoretical Investigation of Slot Waveguide Bragg Gratings

Bragg grating, structures based on dielectric slot waveguide, are investigated theoretically for potential applications as optical resonators and filters. Important device performance parameters, such as the reflection spectrum, the peak reflectivity, and the field confinement factor, are examined as functions of key waveguide and grating design parameters.     

Phase characterisation of metalenses

Metalenses have emerged as a new optical element or system in recent years, showing superior performance and abundant applications. However, the phase distribut...     

Molecular Identification of the G-Protein Genes and Their Expression Profiles in Response to Nitrogen Deprivation in Brassica napus

Heterotrimeric guanine nucleotide binding protein (G-protein) consisting of Gα, Gβ, and Gγ subunits is one of the key signal transducers in plants. Recent studies indicated that G-protein has been proposed as an important mediator of nitrogen responses in rice, wheat, and Arabidopsis. However, little is known about these G-proteins in Brassica napus (B. napus), except for three identified G-proteins, BnGA1, BnGB1, and BnGG2. Therefore, the aim of the present study is to characterize the members of the G-protein gene family in allotetraploid B. napus and to analyze their expression profiles in response to nitrogen deprivation. In total, 21 G-protein family members were identified in B. napus, encoding two Gα, six Gβ, and 13 Gγ. Sequence and phylogenetic analyses showed that although genome-wide triploid events increased the number of genes encoding Gα, Gβ, and Gγ subunits, the gene structure and protein properties of the genes encoding each G-protein subunit were extremely conserved. Collinearity analysis showed that most G-protein genes in B. napus had syntenic relationships with G-protein members of Arabidopsis, Brassica rape (B. rapa), and Brassica oleracea (B. oleracea). Expression profile analysis indicated that Gα and C-type Gγ genes (except BnGG10 and BnGG12 were highly expressed in flower and ovule) were barely expressed in most organs, whereas most Gβ and A-type Gγ genes tended to be highly expressed in most organs. G-protein genes also showed various expression patterns in response to nitrogen-deficient conditions. Under nitrogen deficiency, Gα and five C-type Gγ genes were upregulated initially in roots, while in leaves, Gα was downregulated initially and five C-type Gγ genes were highly expressed in different times. These results provide a complex genetic dissection of G-protein genes in B. napus, and insight into the biological functions of G-protein genes in response to nitrogen deficiency.     

黄河某水电站库区泥石流特征及工程影响研究

黄河某水电站库区泥石流沟道发育,对该水电站运行安全带来不利影响。结合国内外有关研究成果,根据库区内泥石流的具体特征,以杏儿沟、官亭沟和喇家沟为重点研究对象,分析研究了这几条沟泥石流的形成条件及运动特征,包括泥石流的流速、流量等,并将泥石流对工程的危害作出评价。研究成果对水电站建设具有重要指导意义。     

腐蚀的电化学研究现状

基于电化学原理发展起来的电化学测试技术,如极化曲线分析法,交流阻抗分析法,电化学噪声分析法和Kelvin探针技术等,是研究腐蚀的重要手段,近些年有了很大的进展。掌握这些技术的原理及应用领域的进步,将有助于对腐蚀与防护技术的深入研究和开发。     

垃圾腐殖土筛分工艺和筛分单元

主要介绍应用于垃圾筛分中腐殖土的分选环节,适用于垃圾含水率较高和较粘稠的垃圾腐殖土的筛分工艺和筛分单元的研究,介绍工艺中各个环节在腐殖土筛分中的作用,介绍腐殖土筛分中主要设备圆盘筛的设计,为适应含水率较高和粘稠的垃圾腐殖土的筛分做出的改进。     

A viral system algorithm to optimize the car dispatching in elevator group control systems of tall buildings

Nowadays is very common the presence of tall buildings in the business centres of the main cities of the world. Such buildings require the installation of numerous lifts that are coordinated and managed under a unique control system. Population working in the buildings follows a similar traffic pattern generating situations of traffic congestion. The problem arises when a passenger makes a hall call wishing to travel to another floor of the building. The dispatching of the most suitable car is the optimization problem we are tackling in this paper. We develop a viral system algorithm which is based on a bio-inspired virus infection analogy to deal with it. The viral system algorithm is compared to genetic algorithms, and tabu search approaches that have proven efficiency in the vertical transportation literature. The experiments undertaken in tall buildings from 10 to 24 floors, and several car configurations from 2 to 6 cars, provide valuable results and show how viral system outperforms such soft computing algorithms.