全固化蓝光激光器

本文介绍了半导体、SHg与频率上转换三种全固化蓝光激光器的现状与发展趋势，并从理论上作了相应的分

厌氧过滤器处理碱法黑液起动过程的研究

以蔗渣烧碱法黑液为基质，研究了厌氧过滤器的起动过程，结果表明：在起动开始时，外加接种污泥可大大缩短起动时间；逐步增加进水负荷的方式是有效的起动方式；控制适合厌氧菌的适当的环境条件（如PH值、温度等），对加快系统成功运行十分重要

全固化Nd:YVO_4绿光激光器

本文介绍了一种新型微型全固化绿光激光器。采用激光二极管端面泵浦nd：yVO4激光晶体，用kTP作为非线性倍频晶体，当泵浦光功率为360MW时，获得530nM波长、93MW的基横模绿光输出，总的光-光转换效率为24%

FTIR-ATR Spectrometry of BSA Adsorption on Hydroxyapatite

采用傅里叶变换红外衰减全反射(FTIR-ATR)光谱法对牛血清白蛋白(BSA)在羟磷灰石(HA)[Ca_(10)(OH)_2(PO_4)_6]表面不同时间的相互吸附作用进行了表征。在BSA溶液作用下,羟磷灰石表面的Ca~(2+)、PO_4~(3-)和OH~-离子初始的溶解和再沉淀使得BSA与HA相互作用层层叠加,在HA表面形成从表层到次表层分子都包含有吸附的BSA的覆盖层,从而加深两者之间的相互作用。经红外差谱法处理过的相关ATR数据表明,BSA与HA之间的相互作用是快速的,并随时间变化进一步加强;来自HA上PO_4~(3-)的P=O基团对蛋白质肽键的酰胺Ⅱ带(-CNH)、多肽链的甲基(-CH_3)和亚甲基(-CH_2)上氢的吸附作用要比P-O快速而且强烈。Ca~(2+)在该吸附过程中起了极其重要的作用,其快速与蛋白质肽键的羰基氧发生作用,并诱导该蛋白质二级结构由β-折叠向α-螺旋和β-转角构象转变;伴随着这一构象变化,蛋白质多肽链上大多数肽键的-C=O和H-N-活性基团从链间氢键交联中释放出来,带动众多的氢分别参与同HA表面的Ca~(2+)、PO_4~(3-)和OH~-离子的相互吸附作用,并牢牢地结合于HA表面;这对硬组织的再生起着重要作用,促进了HA的生物矿化过程。The microcosmic process of bovine serum albumin(BSA) adsorbing onto hydroxyapatite(HA) for different time intervals was investigated by Fourier transform infrared attenuated total internal reflectance(FTIRATR) spectrometry.The initial dissolution and re-precipitation of PO_4~(3-),Ca~(2+),and OH~- ions from the HA coating led to the occurrence of the coating including adsorbed BSA on the HA from surface-to subsurface-molecular layers and to in-depth interaction between BSA and HA.The subtraction results gained in the adsorption regions of HA and BSA reveal that the binding of P=O,from the phosphate(PO_4~(3-)),to the hydrogen of amide Ⅱ,methyl and methene of the BSA appears to be considerably more rapid and stronger than that of the P—O group.In addition,it is very likely that Ca~(2+) plays an important role in the interaction of BSA with HA.It appears that the binding of Ca~(2+) to the carbonyl-oxygen of the peptide bond in BSA caused a significant,molecular,conformational rearrangement of polypeptide backbones from β-pleated sheet to helical circles of α-helix and β-turn.This change appears to have been followed by much hydrogen of polypeptides being driven to bind PO_4~(3-) and OH~-effectively and much-C=O and H-N- groups of the peptide bond being freed from inter-chain hydrogenbonding to act on Ca~(2+) and combine strongly with the HA surface.This might reasonably be expected to promote hard tissue regeneration.BSA seems to be activated by the inductive effect of Ca~(2+) via the molecular rearrangement of polypeptide backbones from pleated sheet to helical circles and in turn reacts strongly on the HA,resulting in profound effects on the course of biomineralization.国家自然科学基金(51571169)资助项目~

Identifying the Conformational Isomers of Single-Molecule Cyclohexane at Room Temperature

构象异构是化学中的基本问题。然而对于环己烷等柔性分子，由于其在室温下极快的互变异构过程，基于系综的表征方法（如核磁等）只能得到所有构象平均贡献的结果。为了应对这一挑战，化学化工学院洪文晶教授与夏海平教授课题组为在室温条件下对柔性分子构象的定量分析与表征这一挑战，课题组成功实现了在室温条件下对环己烷两种椅式构象的电学表征与比例识别。同时，通过纳米电极间隙对分子的限域作用，发现在宏观尺度下极不稳定的扭船式中间体得以在单分子尺度稳定存在，这为不稳定中间体的研究提供了重要表征方法。 这一研究工作是在化学化工学院洪文晶教授、夏海平教授共同指导下完成的，iChEM直博生唐淳与化工系研究生唐永翔为论文共同第一作者。师佳副教授与刘俊扬副研究员为该工作提供了指导，博士后陈志昕、博士研究生陈李珏以及研究生叶艺玲、严哲玮、张珑漪共同参与了该工作。【Abstract】Isomerism reflects the ubiquitous nature that molecules with the same molecular formula show different structures. The interconversion between conformational isomers of flexible molecules is quite fast owing to the low barriers of around 10 kcal mol−1, leading to average signal contributed by all the possible isomers characterized by ensemble methods. On this account, identifying the conformational isomers of flexible molecules at room temperature has a substantial challenge. Here, we develop a single-molecule approach to identify the conformational isomers of cyclohexane at room temperature through the single-molecule electrical characterization. By noise analysis and feature extraction of the conductance of single-molecule junctions, we quantificationally identified two chair isomers of cyclohexane at room temperature, while such identification is only feasible at low temperatures by ensemble characterization. The strategy to apply the single-molecule approach to identify conformational isomers paves the avenue to investigate the isomerization of flexible molecules beyond the ensemble methods.This work was supported by the National Natural Science Foundation of China (nos, 21722305, 21673195, 21703188, and U1705254), the National Key R&D Program of China (2017YFA0204902), China Postdoctoral Science Foundation (no. 2017M622060), and the Fundamental Research Funds for Xiamen University (20720190002).该工作获得了科技部国家重点研发计划、国家自然科学基金等项目的资助，也得到了固体表面物理化学国家重点实验室、能源材料化学协同创新中心的支持

医用波导CO_2激光器

本文介绍了微小型封离式医用波导CO2激光器的研制。该器件腔长210MM，输出功率5W以上，出射光斑直径约1.2MM，在瑞利长度范围内，无聚焦时，其功率密度最高仍可达440W/CM2。本器件已成功地用于手持式激光治疗机上

Several problems of evaluating laser beam quality of unstable cavity

本文详细论述了半导体蓝光激光器的应用前景、国内外研究动态以及量子阱半导体蓝光激光器件的结构与种类等。The purpose of research of beam quality has been discussed in this paper.The essense of measuring beam quality is considering the prerequisite of energy conservation,to deFine the propagation equation of beam.AFter analyzing Far Field diFFraction properties of virtual conFocal unstable cavity laser beam,it is concluded that the size of central diFFraction spot of annular aperture is smaller than that of circular aperture,whose diameter is same as that of annular aperture.The intensity of Former,however,is lower than that of latter.Likewise,the more narrow the annular aperture is,the smaller the central spot is.Meanwhile,the lower the intensity is.Additionally,the most of energy has been spread out and the Far Field divergence angle has been rised.DeFining beam width in term of energy percentage does not accord with propagation equation and the second moment of Far Field diFFraction intensity distribution of annular aperture beam is divergent,thereFore some basic diFFicults will be encountered when the beam quality of virtual conFocal unstable cavity is evaluated by β and M 2.By the way diFFraction-Free beam or supper diFFraction limiting beam also are discussed.Finally,some possible solutions of evaluating problems of unstable cavity laser beam quality has also been discussed

LD Pumped Microchip Nd∶YVO 4 Green Laser with Frequency Doubling

ld泵浦微片nd∶yVO4倍频绿光激光器1黄元庆叶艺文梅荣华（厦门大学新技术开发研究所厦门361005）ld（激光二极管）泵浦固体激光器，是80年代中期兴起的新技术，近年来发展极为迅速.这种全固化结构的激光器是一种高转换效率、高频率稳定性、窄谱线、微...A new structure of all solid state micro laser is presented.Nd∶YVO 4 crystal is end pumped by laser diode, and KTP crystal is used as a Frequency doubler.The output power of 9.3 mW of TEMoo mode laser at 532 nm has been obtained For pumping power of 360 mW, and the total optical to optical eFFiciency is 2.4 %

Solar powered automatic controlled advertising light box system

Conference Name:2011 International Conference on Mechanical Engineering, Materials and Energy, ICMEME 2011. Conference Address: Dalian, China. Time:October 19, 2011 - October 21, 2011.Trans Tech Publications Inc.; BOSI Education and Consultancy Co., LtdThis paper introduces a solar powered automatic controlled advertising light box system functioning box rotation and poster cycling displaying of each panel, which overcomes the disadvantages of ordinary advertising light boxes of humdrum displaying and high energy consumption. The system includes three parts which are box rotation system, poster scrolling system and single-axis sun tracking system which can improve the solar energy efficiency and reduce energy consumption. Sun tracking system which effectively combined the sun angle tracking and photoelectric tracking method can automatically switch between the work mode and hibernate mode according to time and weather condition so as to maximize energy efficiency. A hierarchical control strategy which contained main control system and sun tracking system is adopted to control light box rotation, panel displaying and sun tracking at the same time. The solar advertising light box system was verified by tests that with the hierarchical control strategy the power generated by solar panel increased 38.2% than fixed panel. Experiment results show that the light box works stably and has potential to apply under the situations where cable laying is not convenient. 漏 (2012) Trans Tech Publications, Switzerland

在具有Cu衬底层的Si（111）面上自组装Co团簇的研究

Nanodots as low dimensional surface structures exhibit interesting physical properties which can be exploited in numerous applications such as a single electron transistor, optoelectronic- and magnetic storage-devices etc. Since the top-down techniques used currently are reaching their limits, the bottom-up self-assembly is probably the most promising technique for the growth of nanoscale systems due to the striving of a system toward a minimal energy and the formation of nanosized structures down to the atomic level. Nevertheless, controlling and tailoring the size and distribution of these nanodotes for possible devices is a challenge and requires a thorough knowledge of the complex interaction between atoms and surface. Since cobalt is regarded as one of the most important elements used in magnetic materials for magnetic or magneto-optical devices and silicon is the key element used in the semiconductor industry, the combination of these two materials will promote the development of materials and devices for next-century magnetoelectronics. However, it is known that Co reacts easily with Si even at room temperature [1]. Nevertheless, recent works have shown that a buffer layer still strongly affects the surface diffusion of deposited atoms and the subsequent island nucleation [2-5]. Annealing of monolayer (ML) amounts of Cu on Si(111) leads to an (5.55×5.55) periodic reconstruction with excellent thermal stability. Although the Cu/Si(111) layer does not exhibit a true long range periodicity, its good stability, together with the significant removal of the Si dangling bonds, indicates that it is a good template for the fabrication of self-assembled Co nanoclusters. As far as we know, there are few studies of Co/Cu/Si(111) system. The present study provides the structural property of self-assembled Co nanoclusters on Cu/Si(111) surface using scanning tunneling microscopy (STM). STM and LEED results show that the Co nanolusters changes not only in the island size but also in the island shape and structures on the top of the islands with increasing substrate temperature from room temperature to 830K during deposition. It was confirmed that the ultrathin buffer layer on Si (111) surface has a significant influence on the surface morphology after subsequent depostiong of Co. On one hand it can partly prevent Co to form Co silicide. On the other hand the diffusion of Co atoms on the surface can be greatly enhanced. [1] J. M. Phillips, J. L. Batstone, J. C. Hensel, I. Wu. M. Cerullo, J. Mater. Res. 5, 1032 (1990). [2] X. Liu, T. Iimori, K. Nakatsuji, and F. Komori, Appl. Phys. Lett. 88, 133102 (2006). [3] T. Schmidt, J. I. Flege, S. Gangopadhyay, T. Clausen, A. Locatelli, S. Heun, and J. Falta, Phys. Rev. Lett. 98, 066104 (2007) [4] P. Aivaliotis, L. R. Wilson, E. A. Zibik, J. W. Cockburn, M. J. Steer, and H. Y. Liu, Appl. Phys. Lett. 91, 013503 (2007). [5] Y. Takagi, A. Nishimura, A. Nagashima, and J. Yoshino, Surf. Sci. 514, 167 (2002). Keywords: STM, Si surface, Co silicide, nanoclusters