新集一矿瓦斯监控系统的升级改造

介绍了新集一矿监测监控系统改造的目标、要求及方案,并对新KJ90监测监控系统的结构、原理、功能作了阐述,对在改造过程中存在的问题提出了改进的建议。     

通过电气改造优化浓缩机控制

随着社会的发展,电气控制在各行各业的作用越来越大,特别在选煤、矿业等方面显得更为明显,电气控制已成为比较重要的研究课题。文章通过电气控制在浓缩机方面的使用,总结出电控的合理性,对电控系统的发展提出了有益见解。     

诱骗态量子密钥分发中不可区分假设的合理性和安全性验证

采用贝叶斯决策来区分单诱骗态量子密钥分发中的信号态和诱骗态。分析结果表明,仍然只能得到信号态和诱骗态拥有相同i光子透射率的结论,从而验证了信号态和诱骗态不可区分这一假设的合理性,也验证了诱骗态方法的安全性。此外,分别对比单信号态和信号态+单诱骗态两种情况下光子数分离攻击前后的安全密钥率,发现前者攻击成功,后者攻击失败,这证明了诱骗态存在的必要性,验证了诱骗态方法确实能够抵抗光子数分离攻击,同时也进一步验证了诱骗态方法的安全性。     

考虑网损因素的示范小区电动汽车接入研究

提出了在负荷不确定方法下计及电动汽车对配电网网损计算方法。以网损的微增量作为电动汽车可行接入点的依据,采用蒙特卡洛方法对负荷不确定进行抽样仿真。比较接入和未接入电动汽车以及接入容量的大小对配电网的影响。通过算例的计算分析,得出了在线性递增负荷的接入下,网损输出的变化率为正的结论。为电动汽车负荷可行接入点、电动汽车接入的最优时间的确定提供了依据。     

Microstructure and mechanical behaviour of Nb–Al–V alloys with 10–25 at.% Al and 20–40 at.% V—II: mechanical behaviour and deformation mechanisms

The mechanical behaviour of three Nb–Al–V alloys with nominal compositions Nb–10Al–20V, Nb–15Al–20V and Nb–25Al–40V (in at.%) have been investigated. Both conventional constant strain rate deformation and compressive creep tests have been performed and the deformation microstructures have been examined by transmission electron microscopy (TEM). At room temperature all three alloys deform by planar slip, with dislocation/particle interactions giving significant strengthening for the two phase alloys. Deformation at higher temperatures occurs by a combination of dislocation glide and climb processes, giving more homogeneous microstructures. All of the dislocations in the B2 phase of these alloys are uncoupled superpartial dislocations with b=1/2<111>. The influence of dislocation/domain boundary interactions on the formation of slip bands and uncoupled superpartials is discussed.     

A HiPAD Integrated with rGO/MWCNTs Nano-Circuit Heater for Visual Point-of-Care Testing of SARS-CoV-2

Nowadays, the main obstacle for further miniaturization and integration of nucleic acids point-of-care testing devices is the lack of low-cost and high-performance heating materials for supporting reliable nucleic acids amplification. Herein, reduced graphene oxide hybridized multi-walled carbon nanotubes nano-circuit integrated into an ingenious paper-based heater is developed, which is integrated into a paper-based analytical device (named HiPAD). The coronavirus disease 2019 (COVID-19) pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is still raging across the world. As a proof of concept, the HiPAD is utilized to visually detect the SARS-CoV-2 N gene using colored loop-mediated isothermal amplification reaction. This HiPAD costing a few dollars has comparable detection performance to traditional nucleic acids amplifier costing thousands of dollars. The detection range is from 25 to 2.5 × 10¹⁰ copies mL⁻¹ in 45 min. The detection limit of 25 copies mL⁻¹ is 40 times more sensitive than 1000 copies mL⁻¹ in conventional real-time PCR instruments. The disposable paper-based chip could also avoid potential secondary transmission of COVID-19 by convenient incineration to guarantee biosafety. The HiPAD or easily expanded M-HiPAD (for multiplex detection) has great potential for pathogen diagnostics in resource-limited settings.     

孤岛工作面采空区煤炭氧化“三带”分布规律研究

张集煤矿17258工作面为孤岛工作面开采,为防止回采过程中出现自然发火事故,采用在上风巷埋设束管,利用JSG-7型煤矿束管监测系统采样、检测采空区内气体,测定出该面采空区“三带”变化规律,确保了17258工作面安全回采。     

支持多安全运算模块的USB3.0控制器固件设计

USB3.0接口以其高速稳定的数据传输能力,已经成为硬件设备的主流接口。该文针对安全运算模块设计中对多模块控制的需求问题,提出了一种可用于多安全运算模块的USB3.0控制器固件设计方法。该方法充分运用CYUSB3014芯片和FPGA芯片的硬件资源,设计了接口传输模式配置、DMA通道、GPIF Ⅱ接口控制逻辑等主要模块的固件程序。经测试,该方案能够有效控制多安全运算模块对PC端数据进行加解密处理,且传输速度能达到330.3MB/s,相比现有设计提升37%,实现了数据的高速可靠传输,具有较好应用前景。     

镁锂合金表面镍磷合金化处理的研究

超轻型镁锂合金是航天、航空的优质轻型材料,但其性质极其活泼、耐腐蚀性能很差,是制约其推广应用的关键问题,且难于进行表面防腐处理.介绍用ML-20701型镁锂合金表面镍磷合金化粉水溶液,在70～75℃条件下,对表面活化的镁锂合金进行浸泡,在镁锂合金表面沉积耐腐蚀合金膜层,从而提高其防腐性能.这也可作为电镀、电泳的预处理工艺,为镁锂合金采用电镀、电泳涂装进行表面防护装饰,提供了有效解决途径.