Extraordinary terahertz transmission through subwavelength spindle-like apertures in NbN filmExtraordinary terahertz transmission through subwavelength spindle-like apertures in NbN filmExtraordinary terahertz transmission through subwavelength spindle-like apertures in NbN filmExtraordinary terahertz transmission through subwavelength spindle-like apertures in NbN film

We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride （NbN） film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity of extraor- dinary terahertz transmission peaks can be greatly modified by the transition of NbN film from the normal state to the superconducting state. An enhancement of the （~1,0） NbN/magnesium oxide （MgO） peak intensity as high as 200% is demonstrated due to the combined contribution of both the superconducting transition and the excitation of localized surface plasmons （LSPs） around the apertures. The extraordinary terahertz transmission through spindle-fike hole arrays patterned on the NbN film can pave the way for us to explore novel active tuning devices.     

Abnormal magnetoresistance behavior in Nb thin film with rectangular arrays of antidots

Magnetoresistance in superconducting Nb films perforated with rectangular arrays of antidots (holes) is investigated at various temperatures and currents. Normally, the magnetoresistance increases with the increasing magnetic field. In this paper, we report a reverse behavior in a certain range of high fields after vortex reconfiguration transition, where the resistances at non-matching fields are smaller than those in the low field regime. This phenomenon is due to a strong caging effect, in which the interstitial vortices are trapped among the pinned multiquanta vortices. This effect is temperature and current dependent.     

Abnormal magnetoresistance behavior in Nb thin films with rectangular arrays of antidots

Magnetoresistance in superconducting Nb films perforated with rectangular arrays of antidots （holes） is investigated at various temperatures and currents. Normally, the magnetoresistance increases with the increasing magnetic field. In this paper, we report a reverse behavior in a certain range of high fields after vortex reconfiguration transition, where the resistances at non-matching fields are smaller than those in the low field regime. This phenomenon is due to a strong caging effect, in which the interstitial vortices are trapped among the pinned multiquanta vortices. This effect is temperature and current dependent.     

芳基二硫醚作为自由基硫试剂构建C—S键研究进展

含硫化合物在医药、农业、天然产物和有机材料等方面有广泛的应用,因而引起了科研人员极大的兴趣,开发高效、绿色的含硫化合物的构建和转化方法具有重要意义.近年来,稳定、低毒的芳基二硫醚类化合物作为刺激性强、毒性大的硫醇类化合物的理想替代物,为各种含硫化合物的构建开辟了一条新的途径.从光催化、非金属参与和过渡金属催化三个方面分类综述了芳基二硫醚作为自由基硫试剂构建C—S键的研究进展.     

关于现代物理学理论(相对论、量子力学、基本粒子理论)的批判、改造和通俗化问题(座谈会发言摘要)

毛主席说：“为什么人的问题，是一个根本的问题，原则的问题．” 科学技术是由少数人所垄断，为资产阶级服务，还是掌握在广大劳动人民手里， 为社会主义革命和建设服务？科学工作者要不要实行开门办科研，走与工农相 结合的道路？工农兵是不是科技工作的主力军？马列主义要不要占领科学理 论阵地？总之，在科学技术领域要不要实行无产阶级专政？这是当前科技战线 上两个阶级、两条路线斗争的焦点． 相对论、量子力学、基本粒子理论这些现代物理学的尖端理论，是在近代物 理学实践和理论发展的新形势下，作为旧物理学理论的对立物产生出来的．它 们的产生无疑地对物理学的发展具有重要的意义．但是，在这些理论中，仍然 渗入形形色色的资产阶级思想，进而常被资产阶级歪曲和利用，成为他们的世 袭领地，作为与无产阶级进行阶级斗争的工具． 因此，有必要站在无产阶级的立场，以马克思列宁主义、毛泽东思想为武 器，对这些理论中的资产阶级思想进行批判，对其理论体系进行改造，剥去其虚 伪神秘的外衣，对其真实的内容进行通俗化的解释，打破这些理论禁地，使它们 成为我国广大工农兵群众能够掌握和利用，为无产阶级革命和建设服务的工具． 为此，我们根据许多读者反映的意见，以及我刊开展“物理学争鸣     

计算亏损系统模态灵敏度的逐层递推演算方法

对不具有完全特征向量系的线性振动亏损系统,在由广义模态理论建立的亏损系统广义模态 空间中,给出了亏损系统广义模态灵敏度分析算法,并推导出以逐层递推方式计算广义模态 展开式系数的简便、快速的演算公式. 给出的数值算例证明了此方法的正确性和有效性.     

皮革中富马酸二甲酯GC-MS测定

建立了皮革中富马酸二甲酯的萃取及气相色谱-质谱(GC-MS)检测方法. 萃取过程以乙酸乙酯作为萃取剂, 超声波辅助萃取;萃取液经过中性氧化铝净化处理. 加标回收率为85.1%～89.3%, 相对标准偏差为5.6%～9.1%. 方法适合于皮革中富马酸二甲酯含量的测定.     

HBPE-b-PMMA嵌段共聚物的合成及其在甲苯中非共价剥离石墨制备石墨烯溶液的研究

首先利用功能化α-二亚胺钯催化剂催化乙烯进行链"行走"配位聚合,获得含有2-溴代异丁酰溴末端基团的超支化聚乙烯(HBPE-Br),然后以其为大分子引发剂引发甲基丙烯酸甲酯(MMA)进行原子转移自由基聚合(ATRP),获得HBPE-b-PMMA嵌段共聚物,并对其在甲苯中非共价剥开天然石墨获得石墨烯甲苯溶液的能力进行了考察.氢核磁共振(1H-NMR)和凝胶渗透色谱(GPC)分析证实,已将PMMA嵌段引入HBPE结构中;紫外-可见光谱(UV-Vis)分析表明,所得共聚物在甲苯中可有效剥开天然石墨获得稳定的石墨烯甲苯溶液,石墨烯浓度可高达0.071 mg/mL;高分辨透射电镜(HRTEM)、原子力显微镜(AFM)和拉曼光谱分析共同表明:所获得的石墨烯结构完整、表面缺陷少,厚度为2~4层.该方法所得石墨烯甲苯溶液可望在聚合物/石墨烯纳米复合材料领域获得应用.     

蔗糖酯和尿素对淀粉改性的协效作用

蔗糖酯是一种对环境无害的表面活性剂,含有与淀粉相容的极性头.将不同比例蔗糖硬脂酸酯加入到玉米淀粉或20％尿素增塑的玉米淀粉中,在热水中煮浆后浇铸成膜.采用X-射线衍射法表征淀粉膜的结晶结构,并测定了浆膜在不同相对湿度下的吸湿性以及浆膜的拉伸性能.结果表明,蔗糖酯可与淀粉形成V-型包合配合物,并影响淀粉的B-型结晶,因此改变淀粉的吸湿性和力学性能.添加0.5％蔗糖酯使淀粉的吸湿率提高,随着蔗糖酯进一步增加,淀粉的吸湿率下降.含尿素20％的淀粉混合物中添加不同比例的蔗糖酯,对淀粉材料的结晶度、结晶形态,以及吸湿率和力学性能产生了不同的影响.蔗糖酯与尿素对淀粉材料改性具有协效作用.含蔗糖酯0.5％的尿素增塑淀粉膜显示出非晶特征,且具有较高的断裂伸长.     

Extraordinary terahertz transmission through subwavelength spindle-like apertures in NbN film

We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride(NbN) film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity of extraordinary terahertz transmission peaks can be greatly modified by the transition of NbN film from the normal state to the superconducting state. An enhancement of the(±1, 0) NbN/magnesium oxide(MgO) peak intensity as high as 200% is demonstrated due to the combined contribution of both the superconducting transition and the excitation of localized surface plasmons(LSPs) around the apertures. The extraordinary terahertz transmission through spindle-like hole arrays patterned on the NbN film can pave the way for us to explore novel active tuning devices.