共查询到18条相似文献,搜索用时 312 毫秒
1.
2.
3.
4.
串行晶体学作为一种解析蛋白质晶体结构的新方法,因其拥有室温采集、辐射损伤低、时间分辨等优势而得到迅速发展。早期发展于自由电子激光的串行飞秒晶体学已成功实现了蛋白质微小晶体结构的解析。为了引入串行晶体学的技术优势,充分发挥第三代同步辐射的丰富资源和特点,基于上海光源BL17U1生物大分子线站,我们对串行晶体学上样方法进行了理论和实验研究,解决了静电纺丝上样方式在同步辐射上应用的难题,用溶菌酶微小晶体论证了其可行性;同时探讨了基于同步辐射的串行晶体学在毫秒时间尺度上的发展潜力,为光束线技术升级提供参考。 相似文献
5.
6.
7.
X射线晶体学技术目前仍然是解析生物大分子结构的最主要手段,获得尺寸足够大的大分子晶体仍然是晶体学技术的难点。小晶体相对于大晶体较容易获得,而且晶格堆积较好,但小晶体容易受到辐射损伤,即使在低温下进行数据采集也很难从一颗晶体获得完整的结构信息。利用激光光刻技术制作用于多颗晶体上样的芯片,实现高通量的多颗晶体衍射数据收集,将多套数据进行合并,获得无明显辐射损伤的生物大分子结构信息。石英芯片背景散射低,上样效率高。基于芯片的晶体上样技术为晶体学研究者提供了一种利用微聚焦光束线站进行小晶体衍射数据收集并获得无明显辐射损伤高质量衍射数据的高效手段。 相似文献
8.
介绍了基于LabVIEW开发的BSRF(北京同步辐射装置)生物大分子光束线监测系统。该系统对光束线真空、冷却水、光学元件姿态、光束状态、液氮状态进行实时监控,及时发现故障并给出报警,以保障光束线设备安全、稳定、可靠地运行。系统底层利用对现场设备开发的驱动程序进行数据采集,采集的数据上传至数据共享平台使之可以通过网络共享。系统上层按照实际功能划分模块,建立光束线总监测界面。通过LabSQL工具包实现系统与MySQL数据库互连,将采集数据传至数据库,方便对数据进行存储、管理和查询。 相似文献
9.
10.
上海光源(Shanghai Synchrotron Radiation Facility,SSRF)光束线站安全联锁系统的目的是在光束线站运行期间,一旦出现紧急情况,安全联锁系统会及时关闭活动光子挡光器或通知储存环控制系统剔除电子束流,以保障实验人员的人身安全及光束线站的设备安全。在SSRF第一条Canted光束线安全联锁系统设计过程中,通过分析Canted光束线与常规插入件光束线在布局与安全联锁要求方面的区别,实现了Canted前端的设备联锁控制要求,并提出了利用束线仲裁信号实现两条光束线和谐相处的设计方法,最终完成了两条光束线的安全联锁系统的安装调试及其验收。Canted光束线安全联锁系统自2013年7月投入试运行以来运行正常,为光束线和实验站的正常调试提供了保障。 相似文献
11.
《Fusion Engineering and Design》2014,89(5):726-730
The experimental data of J-TEXT tokamak are stored in the MDSplus database. The old J-TEXT data access system is based on the tools provided by MDSplus. Since the number of signals is huge, the data retrieval for an experiment is difficult. To solve this problem, the J-TEXT experimental data access and management system (DAMS) based on MDSplus has been developed. The DAMS left the old MDSplus system unchanged providing new tools, which can help users to handle all signals as well as to retrieve signals they need thanks to the user information requirements. The DAMS also offers users a way to create their jScope configuration files which can be downloaded to the local computer. In addition, the DAMS provides a JWeb-Scope tool to visualize the signal in a browser. JWeb-Scope adopts segment strategy to read massive data efficiently. Users can plot one or more signals on their own choice and zoom-in, zoom-out smoothly. The whole system is based on B/S model, so that the users only need of the browsers to access the DAMS. The DAMS has been tested and it has a better user experience. It will be integrated into the J-TEXT remote participation system later. 相似文献
12.
X射线吸收精细结构谱学(X-ray Absorption Fine Structure,XAFS)的发展,提出了对低浓度(痕量)元素研究的需求,高灵敏度的固体探测器纷纷被应用到XAFS技术中来。硅漂移探测器(Silicon Drift Detector,SDD)是一种高计数率、高能量分辨率、采用半导体制冷的小型荧光探测器,其商业产品渐趋成熟。北京同步辐射装置1W2B实验站装备了这种小型SDD,并开发了相应采谱软件供用户使用。经过对含Cu 100 mg·L~(-1)浓度的CuSO_4溶液的测试,结果证明这套新的采谱系统可以满足1W2B实验站XAFS实验荧光模式的需求。 相似文献
13.
14.
Zhoujun Yang Ge Zhuang Xiwei Hu Ming Zhang Shengshun Qiu Zhijiang Wang Yonghua Ding Yuan Pan 《Fusion Engineering and Design》2009,84(12):2093-2099
The Joint Texas Experimental Tokamak (J-TEXT), a medium-sized conventional tokamak, serves as a user experimental facility in the China-USA fusion research community. Development of a flexible and easy-to-use J-TEXT central control system (CCS) is of supreme importance for users to coordinate the experimental scenarios with full integration into the discharge operation. This paper describes in detail the structure and functions of the J-TEXT CCS system as well as the performance in practical implementation. Results obtained from both commissioning and routine operations show that the J-TEXT CCS system can offer a satisfactory and effective control that is reliable and stable. The J-TEXT tokamak achieved high-quality performance in its first-ever experimental campaign with this CCS system. 相似文献
15.
《Fusion Engineering and Design》2014,89(5):558-562
The plasma control system (PCS) plays a vital role at EAST for fusion science experiments. Its software application consists of two main parts: an IDL graphical user interface for setting a large number of plasma parameters to specify each discharge, several programs for performing the real-time feedback control and managing the whole control system. The PCS user interface can be used from any X11 Windows client with privileged access to the PCS computer system. However, remote access to the PCS system via the IDL user interface becomes an extreme inconvenience due to the high network latency to draw or operate the interfaces. In order to realize lower latency for remote access to the PCS system, a web-based system has been developed for EAST recently. The setup data are retrieved from the PCS system and client-side JavaScript draws the interfaces into the user's browser. The user settings are also sent back to the PCS system for controlling discharges. These technologies allow the web-based user interface to be viewed by authorized users with a web browser and have it communicate with PCS server processes directly. It works together with the IDL interface and provides a new way to aid remote participation. 相似文献
16.
This paper presents the advanced version of ePrometheus™ GNF Fuel Cycle Optimization Tool. ePrometheus is Global Nuclear Fuel-Americas LLC (“GNF”) patented computer system used to optimize Boiling Water Reactor (BWR) fuel management and operations. The advanced version of ePrometheus utilizes a new database structure (Oracle 11 g) and a new C#, WPF based graphical user interface (GUI), and employs a capability of performing refueling calculation. It also displays additional 2-D and 3-D core simulation data that are necessary to improve the fuel cycle design process, and utilizes many more advanced features based on user experience feedback. The objective of this paper is to present new advanced infrastructure of the system, and to provide overall information on the advanced features of the newly released version 3.0. 相似文献
17.
《Fusion Engineering and Design》2014,89(5):736-740
As a large fusion reaction device, experimental advanced superconducting tokamak (EAST)’s internal structure is complicated and not easily accessible. Moreover, various diagnostic systems and complicated configuration bring about the inconveniency to the scientists who are unfamiliar with the system but interested in the data. We propose a virtual system to display the 3D model of EAST facility and enable people to view its inner structure and get access to the information of its components in various view sights. We would also provide most of the diagnostic configuration details together with their signal names and physical properties. Compared to the previous ways of viewing information by reference to collected drawings and videos, virtual EAST system is more interactive and immersive. We constructed the browser-oriented virtual EAST physical experiment system, integrated real-time experiment data acquisition, plasma shape visualization and experiment result simulation in order to reproduce physical experiments in a web browser. This system used B/S (Browser/Server) structure in combination with the technology of virtual reality – VRML (Virtual Reality Modeling Language) and Java 3D. In order to avoid the bandwidth limit across internet, we balanced the rendering speed and the precision of the virtual model components. Any registered user can view the experimental information visually and efficiently by logining the system through a web browser. The establishment of the system provides the framework basis for a comprehensive virtual EAST cooperative physical experimental environment. 相似文献
18.
Arwa Salim Louise Crockett John McLean Peter Milne 《Fusion Engineering and Design》2012,87(12):2174-2177
Real-time signal processing in plasma fusion experiments is required for control and for data reduction as plasma pulse times grow longer. The development time and cost for these high-rate, multichannel signal processing systems can be significant. This paper proposes a new digital signal processing (DSP) platform for the data acquisition system that will allow users to easily customize real-time signal processing systems to meet their individual requirements.The D-TACQ reconfigurable user in-line DSP (DRUID) system carries out the signal processing tasks in hardware co-processors (CPs) implemented in an FPGA, with an embedded microprocessor (μP) for control. In the fully developed platform, users will be able to choose co-processors from a library and configure programmable parameters through the μP to meet their requirements.The DRUID system is implemented on a Spartan 6 FPGA, on the new rear transition module (RTM-T), a field upgrade to existing D-TACQ digitizers.As proof of concept, a multiply-accumulate (MAC) co-processor has been developed, which can be configured as a digital chopper-integrator for long pulse magnetic fusion devices. The DRUID platform allows users to set options for the integrator, such as the number of masking samples. Results from the digital integrator are presented for a data acquisition system with 96 channels simultaneously acquiring data at 500 kSamples/s per channel. 相似文献