摘要：Objective To optimize the extraction procedure and obtain the maximum total polysaccharide yield from Turpiniae *** Response surface methodology(RSM),combining Plackett–Burman design(PBD),steepest ascent method,and Box–Behnken design(BBD),was *** significant factors contributing to polysaccharide production were determined by *** path of steepest ascent method was performed to rapidly reach the neighborhood of the optimum *** and RSM were applied to further investigate the mutual interaction between the variables and to define the optimal *** The significant factors contributing to polysaccharide production were enzyme concentration,extraction time,and liquid-to-solid *** optimal conditions for maximal TFP were:enzyme concentration of2.8%,extraction time of41min,and liquid-to-solid ratio of27mL/*** experimental yield of3.08%was in good agreement with the model-predicted yield of3.1%under the optimized *** This study was successfully applied to optimize the extraction conditions of Turpiniae Folium polysaccharide,which can contribute to its further production and application.

摘要：以间苯二酚-甲醛为碳源,三聚氰胺为氮源,二氧化硅溶胶为模板,通过溶胶-凝胶与悬浮聚合工艺制备出毫米尺寸(0.4~0.8 mm)且比表面积和孔容分别高达915 m^(2)·g^(-1)和1.96 cm^(3)·g^(-1)的含氮球形中孔炭。在含氮球形活性炭制备基础上,负载活性组分离子液体[Bmim]Zn_(2)Cl_(5)用于硫化氢和氨气的脱除。研究结果表明,含氮球形活性炭的表面氮掺杂和中孔结构有利于活性组分弥散负载以及脱硫产物的存储,当[Bmim]Zn_(2)Cl_(5)负载量达到50%时,吸附剂对硫化氢和氨气的穿透吸附容量分别达到790 mg/g和41.3 mg/g;且吸附机制与吸附剂失效研究表明,硫化氢脱除归结于炭材料孔隙结构内的催化氧化,而氨气的脱除主要为负载活性组分的化学吸附。

摘要：To improve the performance of traditional mechanical shock absorber, a new type of high molecular polymer is formulated and applied to overloaded vehicle shock absorber. According to the operating principle of high-performance viscoelastic material shock absorber, the geometrical structure of shock absorber is designed and machined. Then its theoretical model is derived by using analytical method, and the impact test is carried out on high-performance viscoelastic material shock absorber. The results show that experimental and theoretical damping force curves have good agreement, which validates the credibility of theoretical model. The investigation provides a potential way to enhance damping performance and increase vehicle load.

摘要：为研究热管堆堆芯基体结构高温下的热应力失效行为,以简化的多孔基体结构为研究对象,结合Megapower 5 MW(热功率)热管堆的设计参数,制定了正常工况和异常工况2种工况下的高温试验方案,其中异常工况考虑了单根热管失效。宏观检测结果显示基体结构未发生明显的变形与失效,结合数值分析方法获得了基体结构在2种工况条件下的温度分布和应力-应变响应,进一步说明了在试验条件下基体结构并不会发生静强度失效和塑性垮塌失效。本研究为明确热管堆堆芯基体结构的强度设计准则奠定了基础。

摘要：提出一种基于变结构PID神经网络控制的数控机床励磁绕组的超阻尼协调控制方法.通过分析数控机床的结构,设计了变结构PID神经网络控制模型.采用自适应算法在线调整权值,实现了对数控机床励磁绕组的超阻尼协调控制方法的改进.仿真结果表明,采用该方法能有效抑制机械加工过程中产生的颤振,并能在很短时间内把机械加工误差控制在合理范围内,提高了数控机床的加工精度和效率.

摘要：在可调喷嘴涡轮的设计思路的基础上,对喷嘴在大开度、中间开度和小开度3种状态下的气动参数、几何参数和叶型进行设计计算,对设计好的增压器进行试验研究,与原型增压器的柴油机相比得出该增压器使原型柴油机的性能大幅度提高,并解决了发动机高速运转时增压过度且低速时动力不足的问题。

摘要：为满足放射性废物快速准确分拣和解控测量的需求,采用MC理论与实验结合方式设计了一套极低水平放射性废物测量系统。实验建立本底计数率与探测器人射窗面积的关系,以此推算拟设计系统存在10mm铅屏蔽下的本底计数率;利用152Eu放射源建立解控水平下最小可探测活度与钚γ射线发射率和系统计数率之间的关系。模拟研究与实验验证表明,设计系统的探测效率不低于30%,本底计数率低于10500s^-1;当测量时间为1000s,系统对15kg废物包的MDA优于300Bq/kg.

摘要：根据网络流量在大时间尺度上的自相似性,以及在小时间尺度上异常流量、Lipschitz正则性与小波变换模极大值三者之间的关系,提出基于小波分析的网络流量异常检测方法.设计了采用该方法检测网络流量异常的模型,解决了方法实现过程中小波选择、模极大值曲线衰减判断、Hurst指数与Lipschitz指数求解等一些关键问题.实验表明,提出的方法能够较好的发现网络流量异常事件并定位异常发生时刻.

摘要：讨论了电弧离子镀Ti-N系涂层制备技术中的几个问题,分析了涂层各工艺参数的相互关系,提出了以镀膜温度为主控参数的工艺设计思路,探讨了耐磨抗蚀复合涂层的结构组成,并介绍了提高涂层刀具锋利度的气体离子刻蚀技术。

摘要：分析和阐释了POF光纤的包层模受抑全内反射(CMFTIR)效应及其传感机制。提出利用光纤宏弯导致模场畸变从而激发光纤包层模式的方法获得显著的CMFTIR效应并利用其实现液位传感。实验表明CMFTIR效应相对微弱,极易淹没于强背景噪声中,为此通过噪声分析提出利用宏弯耦合获得暗场信号以进一步提升信噪比。设计了双绞宏弯耦合型液位探头及其封装结构。实验结果表明,暗场耦合信号具有明显的信噪比优势,实现传感器液位区分度大于3.7 d B。相较于同类液位探头,该传感器鲁棒性好,制作更加简单且成本更为低廉。