摘要：For the reliability and power consumption issues of Ethernet data transmission based on the field programmable gate array （FPGA）, a low-power consumption design method is proposed, which is suitable for FPGA implementation. To reduce the dynamic power consumption of integrated circuit （IC） design, the proposed method adopts the dynamic control of the clock frequency. For most of the time, when the port is in the idle state or lower-rate state, users can reduce or even turn off the reading clock frequency and reduce the clock flip frequency in order to reduce the dynamic power consumption. When the receiving rate is high, the reading clock frequency will be improved timely to ensure that no data will lost. Simulated and verified by Modelsim, the proposed method can dynamically control the clock frequency, including the dynamic switching of high-speed and low-speed clock flip rates, or stop of the clock flip.

摘要：In order to satisfy the requirements of beam measurement in the heavy ion medical machine and other small nuclear physics experiments, we designed and built a nuclear instrumentation module-based data acquisition system. This is composed of a set of functional modules and a purpose-built bus. One of the modules operates as a master, collecting data from the other slave modules. It then sends the data to the back-end computer via *** addition to the hardware, dedicated software has been designed and implemented. In this paper, we provide a detailed description of the architecture of the system, the data frame, and the software. The bus is the central part of the system. It can transmit data from the slave modules to the master at 33 MB/s. The frame used to transmit the data also ensures its integrity and monitors the hardware architecture. The client software is designed to process data in real time and store data on a hard disk for later analysis.

摘要：Combination antiretroviral therapy(ART)reduced AIDS-related mortality and increased survival among patients living with HIV by interrupting HIV replication,enhancing immune recovery,and preventing the onset of opportunistic infections[1].In China,ART has rapidly been scaled up since the beginning of the National Free Antiretroviral Treatment Program(NFATP)in 2003[2].By the end of 2016,489,411 individuals diagnosed with HIV were receiving free antiretroviral treatment in *** is firmly committed to reducing overall AIDS-related mortality and HIV incidence within the ***,similar to other low-and middle-income countries,the NFATP is challenged by high mortality and attrition shortly after patients initiate ART[3].

摘要：为了寻找结构新颖、抗癌活性显著的先导化合物,以桦木醇为原料,设计并合成了一系列桦木醇-28-吲哚酯衍生物,并对合成产物进行了抗增殖活性测试、靶点预测和分子对接研究。结果表明,所有衍生物对3种癌细胞的抑制作用均优于桦木醇。其中,桦木醇-28-((6-氟)吲哚-3-)乙酸酯对3种癌细胞均表现出了低微摩尔级别的抗增殖活性(IC 50<10.00μmol/L),其对A549细胞的作用最强(IC 50=7.25μmol/L),是桦木醇的4.15倍。作用机制研究表明,上述化合物可能通过抑制PI3K-Akt通路发挥抗癌作用。总之,该化合物是一种具有良好抗癌活性的先导化合物,对其进一步的结构修饰和药理研究具有重要的意义。

摘要：基于光栅电磁场理论,应用光栅等效规则计算光栅槽形初始值、结合衍射效率等高线法优化设计光栅槽形,给出了具有几何对称中心的任意槽形光栅.以全息工艺上易于制作的正弦、矩形和两种梯形典型槽形光栅为例进行优化设计,结果表明,正弦槽形光栅C波段TM波衍射效率理论峰值为95%,测量值为92%.较互易定理优化方法,等效规则优化法拓宽了光通信光栅的制作方法、降低了制作难度,为全息方法制作光通信光栅提供了理论依据.

摘要：对延性金属靶板在刚性平头弹丸正撞击下的破坏模式进行了研究。一般而言,延性金属靶板的破坏模式可以分为两种:带有总体变形的局部简单剪切破坏和局部化的绝热剪切冲塞破坏。首先基于Bai-Johnson热塑性本构关系建立了一个局部化的绝热剪切冲塞模型,然后结合描述带有总体变形的局部简单剪切破坏的wen-Jones模型,找出了两种模型之间转化的临界条件。理论预测与文献中的实验结果吻合得很好。

摘要：介绍了如何将核电厂相关设计规范应用于内陆核电厂最终热阱输热系统的机械通风冷却塔的等级划分,分析和总结了核级机械通风冷却塔的特殊设计和建造要求,并提出了核级机械通风冷却塔的设备鉴定过程,为我国自行设计和开发核级机械通风冷却塔提供借鉴和指导作用。

摘要：抖动控制是影响机械抖动激光陀螺性能的重要因素,基于激光陀螺的抖动动力学响应特性,研究了一种抖动控制回路解耦方法,指出相位反馈能实现机抖激光陀螺抖动谐振频率的稳定跟踪。稳定跟踪抖动谐振频率时,如果在抖动位置零点改变驱动信号幅度,则抖幅响应可以简化为一阶惯性系统响应,抖幅控制支路可以从抖动控制回路中解耦为一阶控制回路,实现抖动控制回路的解耦,提高了激光陀螺抖动系统的控制性能。

摘要：利用准直激光、单轴倾角仪和CCD摄像机建立了一种俯仰角组合测量系统以提高俯仰角测量的精度和稳定性。首先,给出了俯仰角组合测量模型,基于坐标旋转算法和迭代方法研究了俯仰角的组合测量原理。然后,采用蒙特卡罗法对影响组合测量系统精度的各个因素进行了全局灵敏度分析。结果表明,与目前工程测量中普遍采用的倾角仪直接测量俯仰角法相比,组合测量法能够获得更高的测量精度和稳定性。利用高精度三轴转台进行的俯仰角测量实验表明:±8°测量范围内,组合测量法误差绝对值最大为0.3 mrad,标准差为0.16 mrad。理论分析和实验结果证明,提出的组合测量法有效地提高了俯仰角测量精度和稳定性,适合工程上的测量需要。

摘要：针对表贴式高速永磁电机转子护套与永磁体之间过盈配合单一、护套内外表面上作用力跨度较大的问题,提出一种多层护套转子结构,能有效减小护套的总厚度。在满足转子机械性能的前提下,多层护套转子结构通过在每层护套之间施加适当过盈量的方法使护套整体的受力分布更加均匀,提升了护套的使用效率,因此总厚度相比单层护套更薄。为快速分析多层护套转子结构的受力情况,建立了该结构的二维应力场解析计算模型。基于解析模型提出了一种多层护套的设计方法,并用该方法对一台高速永磁电机的转子进行设计,且通过有限元分析验证了该设计方法的准确性。最后,将所设计的多层护套与原单层护套相对比,该结构的护套厚度减小了10%、转子涡流损耗减少了12.6%。