摘要：A linear accelerator as a new injector for the SSC （Separated Sector Cyclotron） of the HIRFL （Heavy Ion Research Facility Lanzhou） is being designed. The DTL （Drift-Tube-Linac） has been designed to accelerate ^238U^34＋ from 0.140 MeV/u to 0.97 MeV/u. To the first accelerating tank which accelerates ^238U^34＋ to 0.54 MeV/u, the approach of Alternating-Phase-Focusing （APF） is applied. The phase array is obtained by coupling optimization software Dakota and beam optics code LINREV. With the hybrid of Multi- objective Genetic Algorithm （MOGA） and a pattern search method, an optimum array of asynchronous phases is determined. The final growth, both transversely and longitudinally, can meet the design requirements. In this paper, the deign optimization of the APF DTL is presented.

摘要：The high-current superconducting proton linac is being studied for the accelerator-driven system （ADS） project undertaken by the Chinese Academy of Sciences. The injector II will be operated at 162.5 MHz, and the proton out from the RFQ with an energy of 2.5 MeV will .be accelerated to 10 MeV by two cryo-modules, which are composed of eight superconducting half wave resonance cavities and nine solenoids. In this paper, the design and beam simulation of the superconducting section of the injector Ⅱ, the acceptance calculation and a stability analysis are presented.

摘要：本文分析了农村公路建设对环境的影响,阐述公路设计和施工阶段应采取的环境保护措施和对策。在保证公路建设满足经济发展的同时,确保公路建设带给我们的社会环境、自然环境的负面影响减少到最低限度,为人民创造良好的生活条件。

摘要：今年30岁的穆女士，在一家广告公司做会计。近期,她总感觉心慌慌，而且觉得胸闷，本来以为是工作疲劳所致，但这样的症状持续了一个多月，她就有些吃不准了，于是到医院就诊。

摘要：A new procedure for the design and simulation of a Radio Frequency Quadrupole （RFQ） accelerator has been developed at the Argonne National Laboratory. This procedure is integrated with the beam dynamics design code DESRFQ and the simulation code TRACK, which are based on three-dimensional field calculations and the particle-in-cell mode beam dynamics simulations. This procedure has been applied to the development of a 162.5 MHz CW RFQ which is capable of delivering a 10 mA proton beam for the Accelerator Driven System （ADS） of the CAS. The simulation results show that this RFQ structure is characterized by the stable values of the beam acceleration efficiency for both the zero current beam and space charge dominated beam. For an average beam current of 10 mA, there is no transverse rms emittance growth, the longitudinal rms emittance at the exit of RFQ is low enough and there is no halo formation. The beam accelerated in the RFQ could be accepted easily and smoothly by the following super-conducting linear accelerator.

摘要：针对危险品液罐车在制动时会引发罐内液体的晃动,从而对罐体产生冲击,影响车辆的实际减速度,不利于危险品运输安全等问题,以危险品运输车罐体为研究对象,运用Fluent软件,采用单因素试验分别对制动初速度、初始制动减速度和充液比3种影响因素进行了仿真分析,得到了不同因素对制动工况下危险品液罐车罐内液体纵向冲击力以及有效制动减速度的影响,并采用了均匀试验设计得到了3种因素对试验指标的影响程度大小。

摘要：1．通过发生在身边真实感人的爱心故事，对学生进行感恩教育、互助教育、自强不息敢于战胜困难的教育。让学生明白爱是付出不图任何回报、爱是感恩不计任何代价、爱是珍惜不忘点滴帮助。让爱传递爱，永不止息。

摘要：炎帝神农文化具有丰富的文化内涵和深厚的历史底蕴,是中华民族文化的直接源泉和重要组成部分。炎帝神农氏作为炎黄子孙的始祖,扮演着传授农业文化的角色。农业大学的校园文化建设以“农”为特色,通过发挥炎帝神农文化的魅力,明确“农”的地位,深化“农”的内涵,突出“农”的特色,对自身的发展和学生综合素质的培养都具有重要的作用。

摘要：伏马菌素B_(1)(FB_(1))是农产品生长过程中主要由镰刀菌产生的水溶性真菌毒素,主要污染以玉米为代表的谷物及制品,能引起家畜急性中毒,损害动物免疫系统,具有潜在的致癌性。设计具有良好分散性的氮掺杂石墨烯(NDGRs),作为负载FB_(1)核酸适配体(Aptamer)识别探针的基底,构建了以RecJ_(f) Exo催化剪切FAM-Aptamer/FB_(1)复合物中单链FAM-Aptamer释放FB_(1)、触发靶标循环实现信号扩增的传感策略,建立简化分析步骤、提高灵敏度与稳定性的新型荧光传感器分析方法,用于FB_(1)的检测研究。与不加酶相比,加入RecJ_(f) Exo的传感器获得的荧光强度增加了80.1%。在0.2~20 ng/mL及20~500 ng/mL范围内,荧光强度与FB_(1)质量浓度呈良好线性关系,检出限为0.084 ng/mL。对加标玉米及加标啤酒样品进行检测,平均回收率分别为91%~103%和92%~97%,说明制备的传感器适用于食品中FB_(1)的检测。

摘要：根据正弦波振荡电路的起振原理,设计了西勒振荡器,作为高频功率放大电路的输入端。利用射极跟随器可连接于两电路中间起缓冲作用的特性,设计了缓冲电路。整个设计末端,用一个丙类谐振功放来进一步增强输出电压和输出功率。采用LTspice软件对设计的高频功率放大电路特性进行模拟仿真与分析,验证了理论分析的正确性与可行性。