Monte Carlo simulation of the neutron detection wall at RIBLL II in HIRFL-CSR

With the construction of the new Radioactive Ion Beam Line in Lanzhou (RIBLL II) which connects the CSRm and the CSRe, an experimental setup for physics research is highly required. A large area neutron detection wall is the main part of the setup. This paper introduced the detection principle of the neutron detection wall and the Monte-Carlo simulation of its design under the environment of the Geant4 toolkit. We presented the final design with the optimized parameters and the performance of the wall.

Study of the LED based light calibration system for neutron wall detector

The light calibration system is one of the key components of Neutron Wall detector. It is used to calibrate the electronics and to monitor the long-term stability of the detector modules. With the detaile investigations, a calibration system with high-power LED (3W) driven by the fast pulses has been carried out. It is also tested together with the detector module of the Neutron Wall and the result of the preliminary calibration demonstrates that it fulfills the needs. It's a new design proposal to the light calibration system of the fast scintillator detector.

CSR-RIBLLII终端探测器中子墙电源控制系统的研制

中子墙是CSR-RIBLL II终端最重要的探测器,用来探测实验产物中的中子物质,中子墙选用504个光电倍增管做信号的读出。光电倍增管的工作状态对整个中子墙的探测效率影响很大，近代物理研究所研制的中子墙高压电源控制系统是与中子墙配套的。它采用集散式控制，为光电倍增管提供稳定的工作高压，同时监测光电倍增管工作过程中，高压的电压和电流状态，形成一个闭环的系统。本系统在节省成本，提供高压稳定性，方便操作上都有一定的优势。本文全面论述了一个基于半双工RS-485总线集散式控制系统的设计；根据中子墙高压电源控制系统需求出发，阐明了控制系统的开发背景、基本结构的建立、硬件设计方案和软件的实现。 本论文主要分为六部分：第一部分介绍了CSR－RIBLL II以及中子墙的结构和主要性能，第二部分介绍了光电倍增管和高压组件的基础知识，以及中子墙所有的光电倍增管和高压组件的主要参数，第三部分介绍了本控制系统的总体结构，第四到第六部分详细介绍了控制系统的本地控制单元的软件和硬件设计以及远程控制单元的实现

Numerical approximation of a fractional-in-space diffusion equation (II) - with nonhomogeneous boundary conditions

In this paper, a space fractional di®usion equation (SFDE) with non- homogeneous boundary conditions on a bounded domain is considered. A new matrix transfer technique (MTT) for solving the SFDE is proposed. The method is based on a matrix representation of the fractional-in-space operator and the novelty of this approach is that a standard discretisation of the operator leads to a system of linear ODEs with the matrix raised to the same fractional power. Analytic solutions of the SFDE are derived. Finally, some numerical results are given to demonstrate that the MTT is a computationally e±cient and accurate method for solving SFDE.

Flop II

An installation of sculptural objects that combine references to the portrait bust, drapery and socle with quotidian and incidental objects from the artist's studio. The work form part of the artist's ongoing self-portrait project in which he enacts formal strategies for tempering the authority conveyed by the self-portrait as an artistic genre.

PSED II and the comprehensive Australian study of entrepreneurial emergence (CAUSEE)

Two current longitudinal studies in advanced countries, PSED II in the US and CAUSEE in Australia, have attempted to harmonize the major features of the research design. A comparison of the initial screening and first detailed interviews indicates a higher participation in new firm creation in the U.S. Similar types of persons are involved in both countries, albeit more immigrants, older individuals with more work experience and more established individuals in Australia. The nascent enterprises in the two countries are similar on many characteristics, although those in Australia report greater emphasis on new technology and international customers. Assessment of the prevalence of nascent enterprises and new firms from the Global Entrepreneurship Monitor surveys indicates a higher prevalence of new firms in Australia. These two longitudinal projects may help determine if this reflects a high proportion of new firm births or greater survival in the early years among Australian new firms.