Design study for the cascaded HGHG experiment based on the SDUV-FEL

Cascading stages of high-gain harmonic generation(HGHG) free electron laser(FEL) is a promising way to produce fully coherent X-ray radiation.As a test facility for modern FEL R&D,the Shanghai deep ultraviolet FEL(SDUV-FEL) is now under upgrading for the cascading two stages of HGHG experiment.Since the energy of the electron beam is as low as about 185 MeV after upgrade,the total harmonic number of this two stages HGHG is only 2×2,and the wavelength of the final radiation is 196.5 nm which is the 4th harmonic of the 786 nm seed laser.With help of three-dimensional simulation codes,design studies on the FEL physics for the cascaded HGHG experiment are present based on the parameters of the upgraded SDUV-FEL facility.It is found from the simulation results that the part of the electron beam which has been used in the first stage can still generate powerful radiation in the radiator of the second stage,and this radiation will be difficult to be separated from the radiation generated by the fresh part of the electron beam.To overcome this problem,a novel method based on the energy spectrum of the electron beam is proposed in this paper to demonstrate the "fresh bunch" technique.     

超重核区的双幻性质研究

应用V-S公式、连续介质模型和Strutinsky壳修正能量理论计算结果，对SHEs区的核素进行α衰变能及寿命、基态形状及其变化和壳能级结构进行了研究。并对各种理论模型计算结果进行比较分析，认为298114最有可能成为超重核中唯一的球形双幻核。     

Ellingham图及其在金属制取中的应用

说明了金属氧化物热力学稳定性与其生成反应的标准自由能变化之间的关系，分析了Ｅｌｌｉｎｇｈａｍ图的热力学意义，讨论了金属还原反应的自发性，说明了选择不同金属氧化物的还原剂的热力学依据。     

电厂节能要从管理挖潜

火电厂是生产电能、热能的企业,燃煤成本占火电企业生产成本的65％以上,煤炭价格上涨、煤炭质量下降等不利因素,对电厂带来巨大的经营压力.在长期燃用低热值燃煤的条件下,不但要确保设备的安全运行,还要抓住煤、电、水、油等能源消耗的管理细节,挖潜提效,节能降耗,才能使电厂缓解经营压力,提高经济运行质量.     

利用神经网络算法推算超额吉布斯自由能

利用神经网络算法推算了超额吉布斯自由能Gm^E，并将推算结果与实验结果进行了比较，推算的平均相对误差均在1．42％以内。     

沼气发酵与生态农业

从沼气发酵的微生物学原理、发酵过程及影响发酵的因素和所用原料,综合论述了沼气发酵研究的新进展,并结合生态农业的大背景对沼气发酵的前景、发展趋势等方面进行了分析.     

CPMS类产业的循环经济模式

针对我国铁合金、轻金属和非金属类产业(简称CPMS类产业)资源和能源消耗大、环境污染严重、产品市场竞争力不强的实际情况,分析了该类产业生产过程中高附加值尾气的组成,讨论了其回收、利用途径,提出了该类产业的循环经济发展模式,形成能源、资源—CPMS类产品—尾气—化工产品(电)多联产循环产业链,使我国这类产业走上低能耗、高产出、无污染的绿色科技创新之路并实现可持续发展。     

On a kind of biharmonic boundary value problems related to clamped elastic thin plates

By using complex variable methods, the boundary value problem for biharmonic functions arisen from the theory of clamped elastic thin plate is shown to be equivalent to the first fundamental problem in plane elasticity which, as well-known, may be easily solved by reduction to a Fredholm integral equation. The case of circular plate is illustrated in detail, the solution of which is obtained in closed form. Foundation item: Supported by the National Natural Science Foundation of China (No. 19871064) Biography: LU Jian-ke(1922-), male, Professor. Research interests are in applications of complex variables.     

平面反射对称操作对平均场Hamiltonian的约化

研究了原子核平均场中本征能量的求解．当不存在任何几何对称性时，能量矩阵由２ Ｎ×２ Ｎ个复数矩阵元组成（ Ｎ 为基矢的大小）；如果空间存在１ 个反射对称平面，该２ Ｎ×２ Ｎ复矩阵可约化为１ 对互为共轭Ｎ×Ｎ复矩阵或１ 个２Ｎ×２Ｎ实矩阵；如果存在２ 个互相正交对称平面，则可约化为２ 个Ｎ×Ｎ实矩阵．     

棒材热连轧力能参数的解析

采用三维流函数法 ,对棒材热连轧时的椭圆 -圆孔型系统进行了力能参数的解析 ,其结果与实测符合的很好。该法也可以用于高速线材椭圆 -圆孔型轧制力的计算。