摘要：According to the structure features of Fe80P20, A series of clusters Fe4P were designed and focused on studying the stability of local structure, charge distribution and chemical bond, Using the DFT method, energy and structure of Fe4P clusters were optimized and analyzed. The computational results showed that the energy of cluster 1（2） has the lowest energy, and the possibility of its existence in the Fe80P20 is high. Analyzing the transition states among the clusters, it was found that the clusters in the doublet state are more stable than those in the quartet state. The numbers of the Fe-P bond in the clusters play important roles in the cluster stability and electrons transfer properties, The more numbers of Fe-P bonds in the clusters, the higher the cluster stability, and the weaker the ability of P atom to get electron, The number of Fe atoms, which has bonding interactions with the P atom, is direct proportional to the average 3d orbit population of Fe atom. Basing on the orbital population, average magnetic moments of each Fe atom in the Fe4P clusters were calculated, and they are all smaller than that of single metal Fe atom. This suggests that all Fe4P clusters have soft magnetic property and they are expected to be perfect material for preparing soft magnetic apparatus.

摘要：美国审计总署(GAO)每年都会对美军的国防采办项目进行评估,以防控在国防采办中出现的风险。GAO在获得项目的关键技术、成本、进度等信息,以及在研发、生产过程中产生的统计数据后,采用基于知识的国防采办风险评估方法,对国防采办项目进行评估,提示项目全寿命周期中存在的风险。该方法在国防采办过程中设置三个关键知识点,分别对资源与需求匹配性、产品设计稳定性、生产过程成熟度进行分析。本文详细介绍了美军基于知识的国防采办风险评估方法,并以美军先进反辐射导弹AGM-88E项目为例进行介绍,最后提出了对我军国防采办启示。

摘要：随着交能融合发展,公路边坡设置光伏并由公路沿线用电设备自消纳是其中一个重要发展方向,但是设置光伏后公路路侧的事故严重程度存在未知,为定量评价路侧边坡光伏设施对路侧事故严重程度的影响,以便有针对性地采取交通安全改善措施,从车辆乘员受伤害程度和车辆破坏角度分析,并引入加速度严重指数(ASI)和车辆碰撞吸能作为表征;利用LS-DYNA软件,建立车辆、标志立柱、树木、光伏、桥墩模型,采用实车碰撞试验校核模型的有效性;通过建立5因素4水平正交试验表,完成16组碰撞仿真试验,研究车辆速度、车辆驶离角度、边坡坡度、边坡高度、路侧障碍物类型5种因素对路侧事故严重程度的影响。研究结果表明:仿真结果与实车试验结果一致性良好,仿真模型有效合理;以ASI值和车辆吸收能量作为正交试验评价指标,5种因素对车辆事故的影响敏感度排序为:障碍物种类>车辆速度>驶出角度>边坡坡度>边坡高度,所以边坡设置光伏时应按照此顺序完善交通安全设施改善方案。

摘要：文章研究了仿古建筑设计与智能施工技术的结合与创新实践,在掌握工程概况的基础上,从墙体设计、屋顶设计、门窗设计、节能设计等方面出发,分析了仿古建筑设计要点,同时着重研究了智能测量放线、智能砌筑技术、智能雕刻技术,力求促进施工技术的智能化发展。

摘要：阐述了阿特劳石化工程中石油储罐制作过程中的难点——圆弧段制作的过程,尤其针对圆弧段制作所需凸凹模模具的设计及制作过程进行了详细阐述。首先要确定凸凹模模板的形状、尺寸和材质,再确定凸凹模模具各构件,而后用制作好的凸凹模模具压制出圆弧段的各等分板,再拉运到施工现场拼接、组焊,最后制作出石油储罐圆弧段。

摘要：A method based on capillary electrophoresis coupled with amperometric detection（CE-AD） has been developed for the separation and determination of kaempferol,ferulic acid,vanillic acid,caffeic acid,gallic acid and protocatechuic acid in blueberry wine for the first *** order to get the optimum conditions of separation,the effects of working electrode potential,pH value and concentration of running buffer,separation voltage and injection time on CE-AD were *** the optimum conditions, the analytes could be separated in Na_2B_4O_7-KH_2PO_4 buffer at pH 7.8 within 18 min.A 300μm diameter carbon disk electrode had good current responses at ＋0.95 V（***） for all *** responses were linear with concentrations over three orders of magnitude with detection limits（S/N = 3） at 10^（-8） g/mL magnitude for the analytes and the recoveries were in the range of 95.8- 106.7%.The method could be successfully applied to the analysis of real sample with satisfactory results and therefore recommended for use by the quality control departments of fruit wine producers.

摘要：以颗粒流程序PFC3D为研究工具,结合室内试验,对于落砂成型过程及成型孔隙率的变化规律进行了研究。首先,对落砂过程及结拱现象进行了分析,提出了一种带底孔筒仓流动模型,设计了优化的方形出砂头方案并将其应用于落砂成型试验;然后,利用PFC3D对落高、出砂头孔径、移动速度等因素对成型孔隙率的影响规律进行了模拟和验证。研究表明:当孔径增大时,一次出漏的颗粒数增多,成型时颗粒与颗粒之间的位置尚来不及调整,粒间孔隙较大。随着出砂头移动速度的增大,堆积层次与冲击次数增加,颗粒间的孔隙将会减小。落高增大导致冲击时的动能增大,密实度因而也随之增大。对于所考察的3种试验因素,物理试验与数值模拟均呈现出相同的影响规律。此外,提出的落砂成型孔隙率多因素相关模型具有很好的适应性。

摘要：针对具有反向响应特性的高阶过程,提出了一种分数阶PID控制器设计方法.为了便于控制器设计,采用一种改进的微粒群优化算法对高阶过程模型进行简化处理,在此基础上,根据内模控制原理设计分数阶PID控制器,该控制器仅有一个可调参数,有效降低了控制器整定的复杂度,并根据最大灵敏度指标推导出控制器参数整定的解析表达式,克服了参数选择的盲目性.仿真结果表明,该方法可使系统具有良好的设定值跟踪、扰动抑制特性以及克服参数摄动的鲁棒性.

摘要：Background Traditional techniques used for harvesting the pectoralis major myocutaneous （PMMC） flap have accompanying disadvantages,such as the necessity for an upper chest skin incision,the bulkiness of myocutaneous tissue at the pedicle of the flap,and the risk of total or partial necrosis of flap *** aim of this study was to develop a safe and fast method for preparing PMMC island flaps using preoperative ultrasonography for vessel *** Forty-one PMMC island flaps were used for one-stage reconstruction of head and neck defects,including 21 cases in the treatment group and 20 cases in the control *** the treatment group,ultrasonography was used to mark out the course of the thoracic branches of the thoracoacromial artery and the lower end of this artery perforating from the fascia into the muscles,as well as the largest perforating branch of the fourth or fifth internal mammary artery entering the PMMC flap.A line,from the lower end of the thoracic branch to the largest perforating branch of the fourth or fifth internal mammary artery,was drawn to determine the axis of the PMMC *** the control group,PMMC island flaps were designed according to conventional methods without using *** According to the ultrasonic marks,the distance from lower end of thoracic branch to the midpoint of the margin of the inferior clavicular was （5.1±1.2） *** time from designing to transferring the island flap was significantly shorter in the treatment group （（51.0±10.5） minutes） compared with the control group （（78.0±13.9） minutes,P 〈0.01）.The rate of partial necrosis was 4.7% （1/21） in the treatment group and 35.0% （7/20） in the control *** was one case of flap failure in the control group due to vascular injury during vascular pedicle *** Preoperative vessel detection by ultrasonography facilitates easy and safe harvesting of the true PMMC island flap.

摘要：针对目前高等院校近机类专业机械设计基础教学中存在的问题和不足,从课堂教学和实验教学的质量控制及创新能力培养的角度进行探索与实践,通过教学内容的调整与优化、教学手段和艺术的提高、多媒体教学的使用、实验和实践教学平台及创新基地建设、课程考核等方面的探索与实践,有效地提高了课堂教学及实验教学的质量和效果、学生学习的主动性和创新能力。