强激光的时间整形和空间整形——利用双折射透镜组实现激光束的空间整形

本文使用琼斯矩阵方法对双折射透镜组空间整形系统的光强透射率分布和工作特性进行了分析,并讨论了工程设计中参数的选择以及加工误差带来的影响等有关问题.     

二极管泵浦内腔倍频激光技术研究进展

评述了二极管泵浦内腔倍频激光技术的发展现状，对解决中小功率下‘绿光问题’的理论及实验方案进行了比较分析，对高功率内腔倍频系统亦进行了初步探讨。     

Hutchinsonianism and the Newtonian Enlightenment

Abstract. Historians of science have labeled followers of the 18th cosmologist John Hutchinson (1674– 1737) as anti‐Newtonian. While Hutchinson was clearly anti‐Newtonian, this was not the case with later followers like George Horne and William Jones. Horne and Jones sought a rapprochement between Newton and Hutchinson; in their hands, interpretations of Newton's works were refashioned to support Hutchinson's biblically based cosmos and Trinitarian natural philosophy. Newton's thought could be used by conservative Anglican Churchmen to battle religious heterodoxy. This raises problems for traditional Enlightenment historiography which views Newtonianism as a set of ideas which supported and reinforced emerging modern forms of political and religious thought.     

百菌清及其三氟衍生物对番茄早疫病菌的室内抑菌活性比较

采用生长速率法测定了不同浓度的百菌清及其三氟衍生物对番茄早疫病菌Alternaria solani(Ell,et Mart.)Jones es Gmut的室内杀菌毒力。试验结果表明，百菌清及其三氟衍生物的ED50值分别为6089．89mg／L和156．43mg/L。，前者是后者的38．93倍。百菌清三氟衍生物的毒力明显高于百菌清。     

Prediction of thermodynamic properties for fluid nitrogen with molecular dynamics simulations

Molecular dynamics simulation results in the isochoric isothermal ensemble are reported for a two-center Lennard Jones model of fluid nitrogen characterized by the fixed molecular elongationL = 1 = 0.3292, New values of and were determined by fitting the vapor pressure and the saturated liquid density of the model to experimental data at 94,67 K. The required vapor liquid equilibrium data of the model were taken from a study using the NpT + test particle method. The resulting values are k = 36.32013 K (36.673 K) and = 0.32973 nm (0.33073 nm), with values in parentheses being those obtained previously from a Weeks Chandler Andersen-type perturbation theory. Then pressures and internal energies were calculated by molecular simulations for 110 state points in the temperature range from 72 to 330 K and for densities up to 35 mol · L¹. Comparison of the predictions based on the new parameters with the empirical equation of state of Jacobsen et al. shows good to excellent agreement except in the near-critical region. Moreover. for almost all state points the new parameters yield an improvement over old ones from perturbation theory.     

Prejudicial Narratives: Building Tomorrow's World Today

Film production requires world building: the power to visualise and bring to life narrative through a film's total environment. This is often entirely speculative, imagining alternative or future worlds. Here, Alex McDowell , acclaimed British production designer, producer and Professor at the University of Southern California (USC) describes his world-building, narrative approach to production design, which he consolidated in the Steven Spielberg film Minority Report (2002) that envisioned Washington DC in the year 2050. The possibilities of this storytelling technique are demonstrated by its transference into real-life projects, such as the immersive model that his production company, 5D GlobalStudio, developed for Al Baydha, a Bedouin village in Saudi Arabia.     

Lennard-Jones流体固液相变的分子动力学模拟

采用等温等容分子动力学模拟方法，研究了ＬｅｎｎａｒｄＪｏｎｅｓ流体从固相到液相体系结构和性质的变化。均方位移，径向分布函数，平动序参数等结构和性质的模拟表明体系经历了固液相变。在对比密度为０．８４，０．８６，０．８８和０．９时，体系熔点分别为０．６６～０．６７，０．７１～０．７２，０．８２～０．８３和０．９０～０．９１。     

光纤电流传感器的延迟光纤偏振串音误差

为了减小保偏延迟光纤偏振串音对光纤电流传感器测量精度的影响,利用琼斯矩阵研究了全光纤电流传感器的偏振耦合误差。简化了保偏延迟光纤的偏振串音模型,并基于简化模型得出了保偏延迟光纤偏振串音与输出的关系。通过理论仿真分别分析了在常温和变温条件下偏振串音对传感器变比的影响。对比实验结果与理论分析结论,验证了简化的偏振串音模型的合理性和仿真结果的正确性。测量了实际保偏延迟光纤偏振串音的温度特性,结果表明:在延迟光纤存在一定偏振串音时,光纤电流传感器的变比误差随电流的增加而增大;电流一定时,延迟光纤串音越高,光纤电流传感器的变比误差越大。最后,给出了满足光纤电流传感器0.2S级误差要求时延迟光纤偏振串音的允许波动范围。     

用Jones试剂合成医药中间体4-乙酰氨基环己酮

以4-乙酰氨基环己醇为原料、Jones试剂作氧化剂合成了医药中间体4-乙酰氨基环己酮,反应条件温和、易于控制,反应时间大大缩短,收率稳定,效果令人满意.