一类改进的HIV病理模型的全局稳定性

将治愈率引入经典的HIV病理模型,构建一个改进的HIV病理模型.证明了改进模型中无病平衡点的全局稳定性,给出染病平衡点全局稳定性的参数域,并进行了相关的数值模拟,进而发现当染病平衡点不稳定时模型存在周期解.研究结果表明:提高治愈率是有效控制HIV感染的重要途径.     

3-PCR并联减振机构动力学分析

为实现多自由度减振，以3-PCR并联机构为主体制定多维减振平台；利用拉格朗日法建立机构动力学方程。Matlab数值仿真结果表明，三驱动关节的驱动平衡力相位差为（2／3）π，随动平台相对定平台的位置增加，关节的驱动平衡力减小；当定平台边长增加时，驱动平衡力减小，动平台边长增加时，驱动平衡力增大；移动副轴线与定平台夹角减小时，驱动平衡力减小。     

凸多面体不确定随机时滞系统的非脆弱鲁棒镇定

针对具有凸多面体不确定性的随机时滞系统，讨论了非脆弱鲁棒指数镇定问题，其中非脆弱控制器中的不确定性采用的是凸多面体不确定描述。基于Lyapunov直接法，采用了与参数相关的Lyapunov krasovskii泛函，并结合自由权矩阵方法, 使得Lyapunov矩阵与系统矩阵分离，从而获得了系统的完全基于线性矩阵不等式的时滞相关非脆弱鲁棒镇定的充分条件。最后,用例子说明了结果的有效性。     

钒矿矿石自燃机理及控制技术

中村钒矿矿石开采过程中,出现了采空区矿石自然发火现象,采空区漏风强度大,火区范围大且位置模糊,在灭火过程极易发生爆炸,严重危胁着钒矿的安全开产.本文在分析钒矿矿石特征及物质成份的基础上,掌握了钒矿自燃的机理和燃烧特征.根据钒矿采空区着火的特点,利用液态二氧化碳对火区进行治理,设计了液态二氧化碳释放工艺及管路的布置方案,确定了液态二氧化碳的注入量.通过对钒矿采空区自燃火区进行有效的隋化和降温,抑制和熄灭了火灾,保障了矿山的安全生产.     

武术视角下中国军队抗战中大刀杀敌的辨析与启示

在简述抗日战争中中国军队以大刀战术抗击日寇的概况后,介绍了当时大刀的型制与制造过程;认为大刀战术的本质包括三个方面:武术强国与军事弱国的必然选择;武术价值与军事价值的不对称;精神象征的确立与神圣化的荒诞。大刀技战术对现代武术科学的启示,是其简朴、实用和高效的原则、兼收并蓄的开发胸怀,以及强健精神、净化灵魂、塑造团队精神的文化功效。     

含有氨基酸基团的聚(ε-己内酯)合成与表征

采用氨基酸钠游离的氨基引发ε-己内酯单体开环得到酯肽齐聚物,并以六亚甲基二异氰酸酯为扩链剂,将这些齐聚物扩链合成4种聚酯酰胺.将4种天然氨基酸(L-丙氨酸、L-亮氨酸、L-谷氨酸、L-赖氨酸)引入到聚(ε-己内酯)(poly(ε-caprolactone),PCL)中,合成和表征了4种含有氨基酸残基的聚合物.通过1H-NMR、FT-IR、水接触角、水吸收率和降解实验对该聚酯酰胺进行了表征.实验结果表明:经氨基酸改性PCL的亲水性和降解性得到了改善,其中含有L-赖氨酸残基的聚酯酰胺因亲水性最高,降解速率最快.     

信息时代下高校技防体系建设探析

人类进入了信息时代后,信息量、信息传播的速度,信息处理的速度以及应用信息的程度等都以几何级数的方式增长,各高校也纷纷构建起自己的技术防范体系。高校保卫工作真正做到了人防、物防、技防相结合的新时期。信息时代下的高校技防体系应该建立高效、稳定的技防体系,确保技防设施真正发挥应有的作用,保障校园的和谐稳定。     

Synthesis of graphene on a Ni film by radio-frequency plasma-enhanced chemical vapor deposition

Large-area single-or multilayer graphene of high quality is synthesized on Ni films by radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) at a relatively low temperature (650℃).In the deposition process,a trace amount of CH4 gas (2-8 sccm (sccm denotes standard cubic centimeter per minute at STP)) is introduced into the PECVD chamber and only a short deposition time (30-60 s) is used.Single-or multilayer graphene is obtained because carbon atoms from the discharging CH4 diffuse into the Ni film and then segregate out at its surface.The layer number of the obtained graphene increases when the deposition time or CH4 gas flow rate is increased.This investigation shows that PECVD is a simple,low-cost,and effective technique to synthesize large-area single-or multilayer graphene,which has potential for application as electronic devices.     

Comparison of reduction disintegration characteristics of TiO2-rich burdens prepared with sintering process and composite agglomeration process

To reveal the impact of the composite agglomeration process (CAP) on the reduction disintegration properties of TiO₂-rich ironmaking burden for a blast furnace, the reduction disintegration indices (RDIs), mineral constituents, and microstructure of the products prepared by the CAP and the traditional sintering process (TSP) were investigated. The results showed that, compared to the sinter with a basicity of 2.0 prepared by the TSP, the RDI_+6.3 and the RDI_+3.15 of the CAP product with the same basicity increased by 28.2wt% and 13.7wt%, respectively, whereas the RDI_-0.5 decreased by 2.7wt%. The analysis of the mineral constituents and microstructure of the products indicated that the decreasing titanohematite content decreased the volume expansion during reduction. Meanwhile, the decreasing perovskite content decreased its detrimental effect on the reduction disintegration properties. In addition, the higher silicoferrite of calcium and aluminum (SFCA) content improved the strength of the CAP product. Together, these factors result in an improvement of the RDI of the CAP products. In addition, compared to the sinter, the reduced CAP products clearly contained fewer cracks, which also led to mitigation of reduction disintegration.     

单环铒光纤激光器的混沌行为

利用延时反馈法实验研究单环掺铒光纤激光器的混沌行为,并利用时间序列和功率谱研究该系统的混沌特性.实验结果表明:通过在激光器系统中加入一个光学延时反馈回路,改变光延时反馈信号的强度和延迟时间可增加该单环掺铒光纤激光器系统的自由度;该单环掺铒光纤激光器可通过倍周期分岔途径产生混沌.