新型无盲区角焊机的设计

分析了国内外角焊机的缺陷与不足,针对这些不足提出一种可焊盲区、并具有机械焊缝跟踪的角焊机。该角焊机以STM32单片机为控制器,以步进电机为执行元件,机械结构合理。该角焊机的试焊结果表明,焊缝全长度无接头、成形均匀性好、操作简化、焊接效率提高,该角焊机可投入生产中,具有推广价值。     

The Oblique Incident Effects of Electromagnetic Wave in Atmospheric Pressure Plasma Layers

The propagating behaviours, i.e. phase shift, transmissivity, reflectivity and absorp- tivity, of an electromagnetic （EM） wave in a two-dimensional atmospheric pressure plasma layer are described by the numerical solutions of integral-differential Maxwell＇s equations through a generalized finite-difference-time-domain （FDTD） algorithm. These propagating behaviours are found to be strongly affected by five factors： two EM wave characteristics relevant to the oblique incident and three dimensionless factors. The two EM wave factors are the polarization mode （TM mode or TE mode） and its incident angle. The three dimensionless factors are： the ratio of the maximum electron density to the critical density no/nor, the ratio of the plasma layer width to the wave length d/λ, and the ratio of the collision frequency between electrons and neutrals to the incident wave frequency veo/f.     

Plasma Response to Supersonic Molecular Beam Injection in J-TEXT简

Recently, hydrogen fueling experiments with supersonic molecular beam injection （SMBI） system have been performed in the J-TEXT tokamak. To evaluate the effects of the in- jection amount of SMBI on plasma behaviors, moderate and intensive SMBs have been separately injected and compared with each other in Ohmic discharges. With moderate SMBs, electron den- sity increases about twice as before, the size of magnetic island slightly decreases, and the edge toroidal rotation speed in a counter-current direction, measured by a high resolution spectrometer （Carbon V ion, 227.09 nm, r/a-= 0.7-0.8）, is accelerated from 8 km/s to 12 km/s. The state of higher electron density with moderate SMBI can be maintained for a long period, which indicates that plasma confinement is improved. However, with intensive SMBs, the accompanied magne- tohydrodynamic （MHD） activities are triggered, and the electron density increases moderately. The edge toroidal velocity is decreased, in certain cases even reversed in the co-current direction. The statistical result of experimental data for moderate and intensive SMBs suggests a preferred fueling amount （less than 3.2 ~ 1019） to improve the SMBI fueling efficiency in experiments.     

奇异二阶边值问题的正解

研究了奇异二阶边值问题 u″+λp(t) f (t,u) =0 ,αu(0 ) -βu′(0 ) =0 ,γu(1 ) +δu′(1 ) =0 ,给出了正解的存在性 ,改进和推广了一些已知结果     

鱼乐之辩：中国古代怀疑论和可知论的论证

我国古代也存在怀疑论和可知论之争。庄子和惠施虽然不是两方代表，但二人在他心问题上的争论确也深刻反映了我国古代的认识论思想所达到的高度。这次鱼乐之辩无论就双方的思辩性还是逻辑推理的缜密性都为后人所称道。通过分析二者逻辑推理过程，以剖析其思想的渊源，从而审视庄子和惠施的哲学思想。     

(Ba,Pb)TiO3陶瓷的半导化机理及其湿敏特性研究

为了改善感湿性能很差的BaTiO3陶瓷的湿敏特性,通过PbTiO3与BaTiO3复合,制备了表面为无规则网络状结构、内部具有丰富孔洞通道的(Ba,Pb)TiO3陶瓷,在30℃～70℃的温度范围内、RH=12RH%～93RH%之间5个检测点上测试了该材料的阻-湿特性.依照Anderson无序方法分析了陶瓷晶粒的半导化机理,并从表面吸附及能带理论的观点分析了(Ba,Pb)TiO3陶瓷的湿敏特性.理论上指出施主掺杂(Ba,Pb)TiO3陶瓷晶粒的半导化主要是由于晶格B位处于Ti4+和Nbs+的成分无序状态所致;指出(Ba,Pb)TiO3陶瓷属于复杂性系统,其相对湿敏特性由晶粒半导化、表面吸附、晶界势垒等多个因素决定.结果表明其电阻值在12RH%～93RH%的相对湿度范围内变化3个数量级,且湿敏特性曲线在单对数坐标中接近线性.     

Electromagnetic Wave Attenuation in Atmospheric Pressure Plasma

When an electromagnetic （EM） wave propagates in an atmospheric pressure plasma （APP） layer, its attenuation depends on the APP parameters such as the layer width, the electron density and its profile and collision frequency between electrons and neutrals. This paper proposes that a combined parameter -the product of the line average electron density n and width d of the APP layer （i.e., the total number of electrons in a unit volume along the wave propagation path） can play a more explicit and decisive role in the wave attenuation than any of the above individual parameters does. The attenuation of the EM wave via the product of n and d with various collision frequencies between electrons and neutrals is presented.     

供电所规范化管理系统软件应用解析

就当前供电所管理模式现状,研究如何用科学化管理手段实现供电所规范化管理,提高工作效率,减轻劳动强度。     

浅析通信施工企业的项目化管理

根据通信施工企业的性质和工作内容,项目化管理在通信施工企业管理中非常重要。本文分析了项目化管理对通信施工企业的意义以及存在的问题,提出了在改造企业组织形式、做好管理规划、加强项目化管理培训、人力资源的项目化管理等方面加强通信施工企业的项目化管理。