油页岩循环流化床锅炉返料系统调节特性试验研究

在我国首台油页岩循环流化床锅炉上进行了Ｕ型返器调节特性的工业试验,研究了Ｕ型返料器的启动特性,流化风和松动风数量对Ｕ型返料器工作性能的影响,并且给出了保证返 所需的流化风、松动风最小极限风量。讨论了Ｕ型返顺具有良好调节品质的流化风和松劝风组合调节方式,其结果可用于指导油页岩循环流化床锅炉的运行,亦可供大型循环流化床锅炉运行调节借鉴。     

A 57-Pin Langmuir Probe Array for Two-Dimensional Diagnosis in the Toroidal KT-5D Steady-State Plasma

In this article, the design idea of a 57-pin Langmuir probe array is presented, together with some experimental results. The manufacture technique of the probe array is discussed. Two-dimensional distributions of the plasma density, the floating potential and their fluctuations in the poloidal cross section are obtained. The blobs, which move radially and poloidally, cause great particle and energy transport. The charge neutralization by the poloidal movement of particles greatly decreases the vertical electric field in the helimak plasma. This leads to a confinement time which is two orders of magnitude larger than the theoretical prediction.     

信息化技术在工程设计管理中的应用

企业信息集成应用管理系统是以信息、网络技术为依托,以项目管理为主线,以协同设计为核心,以工作流管理为执行机制,实现设计生产任务从计划下达,到项目人员配置、项目监控及设计产品质量管理,直至项目结束后的业绩考核的全过程管理,实现了数据流、信息流及业务流的融汇贯通。企业集成应用管理系统采用多层SOA架构进行技术实现,主要分为客户层、Web应用层、业务逻辑层、应用服务层和资源层。     

虚拟电子实验台的设计规则与算法

讨论了虚拟实验室构建过程中,虚拟电子实验台的设计规则与算法.虚拟实验台作为虚拟电子实验的核心部件,具有器件的选择、承载、连接、编辑以及电路的合法性检查、保存、读写等功能,给出了一种表面图形化的电路与实际电路拓扑结构映射关系的建立方法,实现了对选取的器件形成的任意电路的仿真.     

服务核聚变研究领域的集群系统

在核聚变研究领域中,高性能集群的应用十分广泛.一方面需要借助集群进行高性能计算模拟托克马克中粒子的运动状态,另一方面需要存储大量十分珍贵的放电数据以作后续的数据分析.随着位于中国科学技术大学的大型反场箍缩磁约束聚变实验装置“Keda Torus eXperiment”（KTX）的建设取得重要进展,KTX实验室对于高性能计算以及实验数据存储具有高度的需求.因此,部署了一个高性能集群并对存储做出了安全设计.根据IOzone的测试,GPFS文件系统的冗余性机制发挥了作用,数据的读写性能很稳定.     

流化床内煤的热破碎实验研究

采用小型流化床实验台对霍林河褐煤进行热破碎特性的实验研究。结果表明：一次破碎率（Pf）和破碎比（Nf）随温度变化的趋势大体相同,但在1-3mm粒径范围内,其变化程度有所不同。说明利用一次破碎率和破碎比在描述煤热解破碎特性具有一定的局限性,这有待于进一步深入研究。     

新建聚酯装置的热媒系统

结合乌鲁木齐聚酯装置的建设经验．全面、系统介绍了该装置的热媒系统的吹扫、气密试验．以及抽真空，热媒引入．常温、升温循环等工作。     

Structure-preserving geometric particle-in- cell methods for Vlasov-Maxwell systems

Recent development of structure-preserving geometric particle-in-cell (PIC) algorithms for Vlasov-Maxwell systems is summarized. With the arrival of 100 petaflop and exaflop computing power, it is now possible to carry out direct simulations of multi-scale plasma dynamics based on first-principles. However, standard algorithms currently adopted by the plasma physics community do not possess the long-term accuracy and fidelity required for these large-scale simulations. This is because conventional simulation algorithms are based on numerically solving the underpinning differential (or integro-differential) equations, and the algorithms used in general do not preserve the geometric and physical structures of the systems, such as the local energy-momentum conservation law, the symplectic structure, and the gauge symmetry. As a consequence, numerical errors accumulate coherently with time and long-term simulation results are not reliable. To overcome this difficulty and to harness the power of exascale computers, a new generation of structure-preserving geometric PIC algorithms have been developed. This new generation of algorithms utilizes modern mathematical techniques, such as discrete manifolds, interpolating differential forms, and non-canonical symplectic integrators, to ensure gauge symmetry, space-time symmetry and the conservation of charge, energy-momentum, and the symplectic structure. These highly desired properties are difficult to achieve using the conventional PIC algorithms. In addition to summarizing the recent development and demonstrating practical implementations, several new results are also presented, including a structure-preserving geometric relativistic PIC algorithm, the proof of the correspondence between discrete gauge symmetry and discrete charge conservation law, and a reformulation of the explicit non-canonical symplectic algorithm for the discrete Poisson bracket using the variational approach. Numerical examples are given to verify the advantages of the structure- preserving geometric PIC algorithms in comparison with the conventional PIC methods.     

钻杆内螺纹接头纵向开裂机理及材料性能指标研究

近年来由于深井、定向井等逐渐增多，油气井钻井中钻杆内螺纹接头纵向开裂失效成为常发事故。大量失效分析发现钻杆内螺纹接头纵向开裂的裂纹源是外表面及螺纹表面的摩擦热裂纹、钳牙咬痕等各种损伤，这些裂纹以脆性断裂或应力腐蚀机理扩展。虽然裂纹源很难避免，但如果能够阻止裂纹的扩展，也能够防止钻杆内螺纹接头纵向开裂失效。应用钻杆失效评估技术研究表明，横向材料冲击功大于80 J将避免钻杆内螺纹接头纵向脆性开裂失效。对钻杆接头材料进行SSC试验，发现如果将材料硬度限制在HB310以内，将明显减少钻杆内螺纹接头纵向应力腐蚀开裂失效。失效案例统计数据验证了这些结果。建议有关标准规定钻杆内螺纹接头的横向材料冲击功，如可行同时限制材料的硬度，选用高性能钻具，以此提高钻具使用寿命，确保钻井速度。