CM1000型路面铣刨机

CM1000型路面铣刨机主要是为城市道路沥青混凝土或水泥混凝土路面的养护作业而开发的高效专用机械设备。输料系统由集料的一级短输送皮带机和抛料的二级长输送皮带机组成。二级长输送皮带机可在左右40。范围内摆动和上下变幅,以方便卡车接料。行走系统由1个变量泵经过4个单独的液压马达和减速器为四轮行走提供可靠动力,铣刨过程中右后轮可以旋转到铣刨转子的前面,便于贴边作业。以CAN—open总线通讯方式为基础的全数字网络控制系统,自动化程度高,可靠性好,扩展性强,并具有故障自诊断和报警功能。铣刨机的行走、铣刨转子、皮带机运转、液压缸动作等,均通过直联在发动机上的液压泵提供动力。液压泵、液压马达、电磁阀、水泵等,均选用国际知名品牌,性能先进,可靠性高。经过长时间的工业考核,其操纵方便、性能可靠、工作效率高、铣刨深度精确的特点赢得用户的赞誉。     

用天然石英粉制备氮氧化硅粉末

以天然石英粉为原料，先进行活化预处理，然后在１３５０℃左右进行碳热还原氮化，制备了氮氧化硅粉末。实验结果表明：氮化过程中ＳｉＯ２的转化率及产物中氮氧化硅（Ｓｉ２Ｎ２Ｏ）的含量与ＳｉＯ２的活化程度、氮化温度及添加剂等因素有关，其中氮化温度以１３５０℃为佳；随着ＳｉＯ２活化程度的提高，其转化率也提高；添加少量的ＳｒＯ，可以进一步提高ＳｉＯ２的转化率。此外，还分析了ＳｉＯＣＮ系统中气体分压对Ｓｉ２Ｎ２Ｏ形成的影响。     

The syntheses and microstructures of tabular SrTiO3 crystal

In the present paper, the microstructures of SrTiO₃ particles obtained in two different methods were examined by scanning electron microscopy (SEM) and X-ray diffraction pattern (XRD). The two synthesis techniques included a conventional mixed solid method and a molten salt synthesis method (MSS), which proceeded through two steps. In the first, precursor Sr₃Ti₂O₇ particles were synthesized. Tabular SrTiO₃ crystals were synthesized via the superposition of the SrTiO₃ basic cell on the interface of Sr₃Ti₂O₇ particles. The microstructures of SrTiO₃ particles synthesis in those two ways were quite different. The microstructures of SrTiO₃ obtained by MSS method were high purity and obviously tabular in structure. Oriented growth faces included typical (0 0 1), (1 0 0), (1 1 0), etc. The mechanism of the oriented growth of tabular SrTiO₃ could be considered as the superposition of coordination polyhedron Ti–O₆ octahedron basic cell on the interface of Sr₃Ti₂O₇ particles.     

Protocol sequence and control co‐design for a collection of networked control systems

This paper is concerned with the simultaneous stabilization of a collection of plants shared by the wireless network with capacity limitation. We use most regular binary sequences (MRBS) to control the medium access status of the plants. The design procedure of the scheduling policy translates to determine two parameters of the MRBS. With the MRBS protocol, each plant is essentially a sampled‐data control system with time varying sampling intervals. We derive a sufficient condition for determining the MRBS protocol that guarantees the controllability, observability, and stability of each plant. Most importantly, we give a methodology for MRBS protocol and controller co‐design, in which the controller has switching gains that are piecewise constant and dependent on the sampling intervals yielded by the MRBS. The main results are established using piecewise Lyapunov functional and the average dwell time technique. It is shown that the method can guarantee simultaneous stabilization of the collection of plants robustly in situations where the controller gain does not match the sampling interval or the sampling interval violates the maximum allowable transmission interval criteria. A numerical example is given to demonstrate the effectiveness of the co‐design method. Copyright © 2015 John Wiley & Sons, Ltd.     

可调电源在笔记本维修中的应用

对可调电源的工作原理进行了进一步剖析,利用可调电源采检测笔记本的故障,通过可调电源电流指针的不同来寻找故障位置.这样能够迅速缩小故障范围,更直观、更简捷,但由于电流大小受很多因素影响,如电压、电阻、开断路等,所以需要根据实际情况及故障现象、测量结果来具体分析,不能盲目下结论.     

过载检测与保护技术在深孔加工中的应用

针对大长径比、小直径高速深孔加工中打刀、走偏、刀杆扭曲和弯曲等问题．设计了一套以磁粉离合器为执行元件的过载检测与保护装置,并应用于数控深孔机床。最后通过多次试验．证明该装置能够有效监控过载．起到预防和保护作用,满足了生产需要。     

深孔钻床的改造

应用可重构设计理论和先进的“DF”负压抽屑机理，对传统的深孔钻床进行了功能模块化设计和数控改造。同时实现了深孔刀具的系列化设计，极大地提高了深孔钻床的加工质量和应用范围。     

不同酶对巫山淫羊藿中淫羊藿苷和朝藿定C含量的影响及抑菌活性研究

在巫山淫羊藿提取物中分别加入α-淀粉酶、果胶酶、纤维素酶进行酶解,经大孔树脂纯化后采用HPLC法测定巫山淫羊藿中淫羊藿苷和朝藿定C含量;并初步研究了巫山淫羊藿提取物对金黄色葡萄球菌和大肠杆菌的抑菌活性.结果表明,巫山淫羊藿提取物在经过酶解和纯化后,淫羊藿苷和朝藿定C的含量均明显增加,其中果胶酶对两者含量的影响最大,巫山...     

利用窑灰生产高效土壤稳定水泥的研究

研究了用纯窑灰、掺ＣａＳｏ４－ＣａＦ２复合矿经剂的窑灰煅烧熟料与适量石膏混合配制的窑灰水泥稳定土的力学性能,并探讨了煅烧温度和石膏掺量对窑灰水泥稳定土强度的影响。结果表明,窑灰水泥对土壤的稳定效果显著优于普通水泥。用于稳定土的水泥其技术指标与普通水泥有很大差异,可允许水泥中含有一定数量的ｆ－ＣａＯ,ＳＯ和碱含量。