CO2-CH4重整NiO／γ-Al2O3催化剂制备方法与其催化性能的关系研究

分别采用自然浸渍法（1#）、超声波浸渍法（2#）、旋转真空浸渍法（3#）和胶体磨循环浸渍法（4#）制备NiO／γ-Al2O3催化剂,对其进行TPR和XRD分析,TPR分析结果表明,四种试样的还原温度均低于800℃,均不存在自由NiO物种;XRD分析结果表明,焙烧后的四种试样均存在NiO和NiAl10O16尖晶石两种晶相。四种试样的CH4／CO2重整反应30h评价实验结果表明,胶体磨循环法所制备的催化剂评价结果最好,其CH4和CO2转化率分别为93．5％和83．5％,n（H2）：n（CO）=0．84：1。     

Lactobacillus plantarum BC299 can alleviate dextran sulphate sodium-induced colitis by regulating immune response and modulating gut microbiota

It is well known that probiotics are effective in relieving inflammatory bowel disease (IBD). However, their exact mechanism is still unclear. Herein, we evaluated the effect of novel Lactobacillus plantarum BC299 on dextran sodium sulphate (DSS)-induced colitis model mice and investigated the molecular mechanism. We found BC299 could regulate immune response and reduce immunosuppression by enhancing the expression of Th1 T cells in cyclophosphamide-induced immunosuppressive model mice. Meanwhile, DSS-induced colitis model mice were furtherly constructed. The results displayed BC299 can restore bodyweight and relieve colon morphology of colitis mice. Real-time quantitative polymerase chain reaction results demonstrated BC299 can regulate immune response by reducing the expression of TNF-α and IL-1β mRNA and increasing the expression of IL-10 and TGF-β mRNA. Moreover, BC299 administration reshaped and increased the diversity of gut microbiota in IBD mice. Therefore, BC299 can alleviate colitis by regulating immune response and modulating gut microbiota.     

嵌入式SNMP代理的时钟同步功能实现

为提高应用于嵌入式SNMP代理中的同步时钟的性能,设计一种适用于代理的同步时钟。通过研究精确时钟同步协议,结合LPCI766开发板及DP83640以太网收发芯片,基于μC／OS-Ⅱ操作系统,使用软硬件相结合的方法,使嵌入式SNMP代理具备了精确时钟同步功能。测试结果表明,该时钟较以往代理中的同步时钟在稳定性和精确度方面有明显提升。     

Modeling of Maglev Yaw System of Wind Turbines and its Robust Trajectory Tracking Control in the Levitating and Landing Process Based on Ndob

The yaw system is one of the important parts of the horizontal axis wind turbines. In this paper, a novel maglev yaw system (MYS) is introduced, a novel robust controller based on nonlinear disturbance observer (NDOB) is proposed to improve the dynamic suspension stability of the MYS in its levitating and landing process. First, the dynamic model of the MYS is built and analyzed as well as the model of the force caused by crosswind exerting on the MYS, and then the mathematical model of the MYS is derived from its dynamic model. Second, since the uncertain internal disturbance originated from the MYS itself exists, in order to realize the finite time convergence and improve the robustness of the MYS, a NDOB‐based robust controller is designed via like nonsingular terminal sliding mode (LNTSM) method with the aid of backstepping design idea (BDI) to guarantee that the system output asymptotically tracks the reference trajectory, and the levitating and landing velocities of the MYS converge to their expectations globally and asymptotically in finite time. Finally, compared the conventional backstepping control (BC), the extensive simulation results show that the proposed robust controller has a better robustness and the MYS can realize smooth and reliable operations in its levitating and landing process in finite time, therefore the novel robust controller is substantiated to be effective and feasible.     

基于LTE-A系统终端侧EPS承载多实例管理的设计与实现

LTE-A系统在网络架构方面将控制平面与用户平面进行了分离,ESM子层属于控制平面。在传输用户业务数据时ESM子层即不能实时管理物理承载的使用,也不能实现上行数据流模板(Uplink Traffic Flow Template, UL-TFT)的功能,为了正确传输用户数据并获得相应的业务的服务质量（Quality of Service, QoS）,在设计终端侧协议栈软件时,在用户平面中增加承载控制实体BC,通过对UL-TFT和EPS承载路由信息管理进行设计以及搭建基于TTCN-3（Testing and Test Control Notation version 3)测试系统的终端无线资源管理（RRM）一致性测试平台,对流程设计进行验证。与UMTS系统相比,利用多实体管理技术,承载建立和业务数据传输的时延明显减少。     

铝热法合成NiAl／Al2O3复合材料

以铝粉和NiO粉为原料,采用铝热法合成了NiAl／Al2O3复合材料。通过X射线衍射分析仪（XRD）,扫描电子显微镜（SEM）并结合差示扫描量热仪（DSC）对其相组成、微结构和反应过程进行了分析。实验结果表明：850℃Al／NiO体系铝热反应被点燃,并自蔓延发生于整个反应系统;950℃保温40min,Al／Ni0体系铝热反应生成相互交织网状结构的NiAl／Al2O3复合材料。     

基于μC／OS—III的多功能控制器

轨道运输车项目的电控部分要实现人机界面、遥控、避障、电机控制、车辆控制多个子模块功能。多功能控制器在μC／OS-III操作系统上实现人机界面、遥控、车辆控制三种功能,简化了系统设计。通过硬件设计、操作系统移植、驱动编写、软件结构设计、软件编码和调试等过程实现了一种多功能控制器。     

基于BC7281B的分布式润滑系统人机接口的设计

在分布式润滑系统中,需要为供油终端配备人机接口用于设定润滑参数和显示工作状况.给出了基于专用控制芯片BC7281B的人机接口设计方案,提供了驱动大尺寸数码管的硬件电路和详细的应用函数代码.分析了握手信号丢失引起的死循环故障并给出了可行的解决方案,对于单片机应用系统人机接口的开发具有一定的参考价值.     

热处理对Fe81Ga19合金组织结构与磁致伸缩性能的影响

采用电弧熔炼法制备了Fe81Ga19合金多晶样品,研究了不同热处理工艺对合金组织结构及磁致伸缩性能的影响.样品经过700℃、800℃和900℃保温后采用空冷、炉冷和淬火3种冷却方式.结果显示,经过不同热处理后样品的微观组织均为单相bcc结构,而磁致应变从34×10-8到94×10-6不等;当热处理温度为800℃时,淬火处理后可获得较好的磁致伸缩性能(88×10-6),而热处理温度较高(900℃)时,采用炉冷的方式可获得较好的磁致伸缩性能(94×10-6).推测热处理方式和晶体取向对Fe81Ga19合金磁致伸缩性能有较重要的影响.     

一种低截获概率雷达信号及其信号处理

针对低截获概率雷达设计了一种线性调频和相位编码混合信号，这种混合信号兼有线性调频和相位编码信号的优点，又弥补丁各自的缺点，以小时宽、小带宽获得大信噪比改善。文中对这种混合信号的性能及脉冲压缩处理进行了理论和仿真分析。