Design of Magnetic Measurement System on SUNIST Spherical Tokamak

A magnetic measurement system consisting of magnetic probes and flux loops for spherical tokamak SUNIST, is uniquely designed due to the strongly shaped plasma cross section and the narrow space near the central solenoid. Plasma equilibrium reconstruction with the current filament method is performed to determine the number and positions of the magnetic probes and flux loops, as well as their design precision required.     

农村节能减排工作存在问题与解决对策的探讨

针对目前农村节能减排工作落实现状及存在的问题进行了归纳,通过对妨碍农村节能减排政策落实的因素进行分析,提出了推进农村节能减排工作的建议,以实现农村经济的快速发展。     

全断面深孔帷幕预注浆止水施工技术

结合隧道工程实例,从施工工艺流程、超前地质预报叉深孔帷幕预注灌浆等方面,介绍了全断面深孔帷幕预注浆止水的施工技术。     

Coupling Effect between Equilibrium Field and Heating Field and Modification of the Power Supply System on SUNIST Spherical Tokamak

Strong inductive coupling between the heating field and equilibrium field is confirmed to be responsible for the poor plasma equilibrium in initial discharges on the SUNIST spherical tokamak. A modification project for the power supply system of equilibrium field coils is successfully performed to increase the duration time of plasma current flattop from nmch less than 1ms to about 2 ms.     

Identification of Plasma Boundary and Position for HL-2A Tokamak

Using the virtual-case principle, the plasma boundary, the plasma current center, and the x-point are identified for the HL-2A tokamak. The plasma current is represented by the current center and the virtual multipole moments which produce a magnetic flux in a form of polynomial. Adaptive parameters in the polynomial are determined by the least-square fit of the poloidal magnetic fields. The measurement of the magnetic field is performed using pick-up coils. The virtual-case principle is applied outside the plasma boundary. The virtual-case currents decide the position of the current center and produce a negative confinement magnetic field inside the plasma and the magnetic field generated by the plasma current outside the plasma boundary. The convergence is fast enough to get a picture between the sequent shots. The configuration reconstructed is in good agreement with the TV image taken by camera with a tangential view.     

Investigation of Some MHD Events in the SUNIST Spherical Tokamak

Internal reconnection event （IRE）, which is characterized by a perturbation in plasma current Ip, loop voltage Vloop, Hα radiation and magnetic perturbation dBp...     

裙板安装对高速列车气动性能影响的数值分析

为研究裙板安装对高速列车气动阻力及侧风安全稳定性的影响,用计算流体力学（Computational Fluid Dynamics,CFD）方法分析国外某高速列车转向架及其周边裙板结构对整车气动性能的影响.在无侧风且列车行驶速度为350km/h时,模拟分析不安装裙板及在不同位置安装裙板情况下列车的气动性能;在有强侧风情况下,模拟分析列车在50～350km/h之间不同行驶速度工况时的气动性能.结果表明,列车底部安装裙板可有效降低列车气动阻力,在头尾第1对转向架处安装裙板对列车气动阻力的降低最有效;在强侧风下,列车底部安装裙板会造成列车的侧向力和侧翻力矩加大,降低列车行驶安全性.     

ZrO_2-硬脂酸系纳米复合相变储能材料的可行性研究

回顾了储能材料尤其是相变储能材料的发展及基本应用。对比前人研究成果,提出了使用ZrO2-硬脂酸系纳米复合材料作为相变储能材料的设想,并且结合现有的成果初步论证了ZrO2-硬脂酸系纳米复合相变储能材料的应用可能性。通过调节pH值等制备和改性参数使用共沉淀法或直接复合法,可以取代不能大批量生产的溶胶-凝胶法。并且由于ZrO2有着比SiO2更好的机械强度和耐高温性能,所以使用ZrO2代替SiO2,完全可以制备出有着类似于SiO2-硬脂酸系相变储能材料储热性能的复合材料。     

燃-蒸联合循环机组模块匹配分析软件设计

燃气-蒸汽联合循环电站在我国大中城市的广泛应用,使得发展和完善建设该种电站时的评估技术成为必然。为了简化建设期的评估工作和提高工作效率,该文使用Borland Delphi6．0及其数据库控件设计并实现了一个针对燃气-蒸汽联合循环电站系统机组设备模块匹配选型的方案分析及相应投资经济性分析的软件。该文主要介绍了该软件的设计思路、主要功能、运行流程、热力性及经济性计算模型和数据库结构。通过模拟实例的计算,证明该软件较好地完成了设计的目标。     

施工企业项目成本管理

成本管理是施工企业项目管理的基础和核心。成本管理需要进行控制,本文总结了施工企业项目成本管理的原则,从自行施工及分包施工两方面提出了项目成本管理的措施,并探讨了从各个环节实现成本的动态管理。