Solvability of nonlocal boundary value problems for ordinary differential equation of higher order with a -Laplacian

Nonlocal boundary value problems at resonance for a higher order nonlinear differential equation with a p-Laplacian are considered in this paper. By using a new continuation theorem, some existence results are obtained for such boundary value problems. An explicit example is also given in this paper to illustrate the main results.     

复杂军工产品虚拟试验验证技术研究与发展

虚拟试验验证是一种基于数字样机模型的复杂产品关键系统试验数据产生、获取和分析的系统工程过程;文中从支撑框架、验证范围、试验环境和标准化等方面分析了国外该领域最新的发展趋势,结合十一五国内虚拟试验领域的典型研究和应用现状,对现阶段军工产品虚拟试验验证领域的研究成果进行了总结;在此基础上,分析了十二五试验与测试领域的研究重点,提出了虚拟试验验证技术领域研究的发展设想,并对VITA技术框架进行了着重阐述;最后,给出了发展我国虚拟试验验证技术的建议。     

基于LM74的啤酒发酵罐群温度采集系统

对啤酒发酵罐群大量的温度测点,采用新型数字化温度传感器LM74来实现信号采集,计算机发出片选控制信号,送至芯片74HC138完成片选功能,实现温度巡回检测。LM74与计算机之间通过SPI串行总线通讯,将采样数据和采样时间存储在计算机中,便于数据的查询和分析,同时系统具有温度上下限报警功能,给生产过程的长期正常运行和检查带来了很大的方便。与传统模拟系统相比,获得了稳定性好、测温精度高、功耗低、经济效益显著的良好效果。     

Gliadin Peptide P31-43 Induces mTOR/NFkβ Activation and Reduces Autophagy: The Role of Lactobacillus paracasei CBA L74 Postbiotc

Celiac disease (CD) is an autoimmune disease characterized by an altered immune response stimulated by gliadin peptides that are not digested and cause damage to the intestinal mucosa. The aim of this study was to investigate whether the postbiotic Lactobacillus paracasei (LP) could prevent the action of gliadin peptides on mTOR, autophagy, and the inflammatory response. Most of the experiments performed were conducted on intestinal epithelial cells Caco-2 treated with a peptic-tryptic digest of gliadin (PTG) and P31-43. Furthermore, we pretreated the Caco-2 with the postbiotic LP before treatment with the previously described stimuli. In both cases, we evaluated the levels of pmTOR, p70S6k, and p4EBP-1 for the mTOR pathway, pNFkβ, and pERK for inflammation and LC 3 and p62 for autophagy. For autophagy, we also used immunofluorescence analysis. Using intestinal organoids derivate from celiac (CD) patients, we analyzed the effect of gliadin after postbiotic pretreatment with LP on inflammation marker NFkβ. Through these experiments, we showed that gliadin peptides are able to induce the increase of the inflammatory response in a more complex model of intestinal epithelial cells. LP postbiotic was able to induce autophagy in Caco-2 cells and prevent gliadin effects. In conclusion, postbiotic pretreatment with LP could be considered for in vivo clinical trials.     

基于单片机的安防抄表终端盒的设计与实现

本文简要介绍了一种用于智能小区安防抄表系统用户终端盒的技术实现方案，并重点阐述了如何以PICl6C74型单片机作为小区安防秒表系统用户终端盒的主控制芯片来实现各项控制和处理功能。     

小井距提高低渗透油藏采收率方案优化研究——以胜利油田桩74—10—2井区为例

胜利油田桩74—10-2井区是特低渗透构造岩性油藏．在开发过程中，由于注采井距大，导致油层压降大，油井供液不足，单井产能低，注水效果不明显．开发效果较差。对该井区进行了调整方案研究，共提出了4个调整方案。结果表明．使用方案2，即当井网的井排方向与主裂缝方向错开45。角左右，井距在140～200m．注采比为1．0～1．1，压力水平保持在25．00～28．00MPa之间时，采收率可以达到28％以上。使用投资回收期法对各调整方案进行经济评价，结果表明调整方案2的投资回收期为4．33年，投资回收时间最短．经济上最合算。因而确定调整方案2为最终选择应用的方案。     

基于74HC4046的新型频率跟踪电路研究

频率跟踪是超声波电源的一个重要特性。本文讨论了超声波清洗机中自动频率跟踪的必要性,在介绍超声波清洗机的主电路原理、PLL锁相环原理的基础上,利用单片机检测超声电源负载的电流、电压的相位差,来改变74HC4046的输出频率,完成了变步长频率跟踪软件设计。结果表明,该系统具有很好的频率跟踪性能。     

基于PIC16C74无线智能型环境监测系统

以无线数据收发模块DTD465B为通信平台,把基站采集到的各环境参数发送给中心站,通过数据处理,实现环境参数的显示、环境参数变化曲线的显示以及参数储存、语音报警、自动拨号和语音提醒等功能。     

Evaluation of Mg‐MOF‐74 for post‐combustion carbon dioxide capture through pressure swing adsorption

This paper presents a computational study of an energy‐efficient technique for post‐combustion CO₂ capture using novel material, namely, Mg‐MOF‐74, using pressure swing adsorption (PSA) processes. A detailed one‐dimensional, transient mathematical model has been formulated to include the heat and mass transfer, the pressure drop and multicomponent mass diffusion. The PSA model has been further extended by incorporating a heat regenerating process to enhance CO₂ sequestration. The heat dissipated during adsorption is stored in packed sand bed and released during desorption step for heating purpose. The model has been implemented on a MATLAB program using second‐order discretization. Validation of the model was performed using a complete experimental data set for CO₂ sequestration using zeolite 13X. Simulation of the PSA experiment on fixed bed has been carried out to evaluate the capacity of Mg‐MOF‐74 for CO₂ capture with varying feed gas temperature of 28 and 100 °C, varying pressurization and purge times and heat regeneration. It was discovered that the PSA process with heat regeneration system might be advantageous because it achieves equivalent amount of CO₂ sequestration in fewer PSA cycles compared with PSA without heat regeneration system. Based on the simulated conditions, CO₂ recovery with Mg‐MOF‐74 gives high percentage purity (above 98%) for the captured CO₂. Copyright © 2015 John Wiley & Sons, Ltd.     

Long-time behavior of the solutions of Murray–Thomas model for interacting chemicals

This paper is concerned with the Murray–Thomas model for interacting chemicals or species, under Robin boundary data. It is shown that the solutions are bounded and asymptotically converging toward an absorbing set of the phase-space. The stability of the positive constant steady states is discussed via a symmetrization procedure.