微信小程序赋予图书馆内部办公自动化的新可能性及实践重点——以厦门大学为例

在对微信小程序\"核心能力\"分析的基础上,以现实需求为导向,立体对比了三种主要技术路线,阐述了微信小程序在助推图书馆内部办公从\"自动化\"向\"移动化\"全面演进中的无限潜力。通过厦门大学具体实践中的几个应用场景,真实展现小程序在内部管理效率提升方面的优势,不仅是抛砖引玉,更是为了探讨实践中的开发思路和技术难点

Density Functional Theoretical Study on SERS Chemical Enhancement Mechanism of 4-Mercaptopyridine Adsorbed on Silver

基于密度泛函理论计算和拉曼光谱理论分析,我们研究了对巯基吡啶(4MPY)分子的拉曼光谱和其在银上的表面增强拉曼光谱(SERS),并进一步探讨了S; ERS与界面吸附结构、异构化、质子化和氢键作用以及低能激发态的关系。首先,我们对两种分子异构体的相对稳定性和拉曼光谱进行了理论分析。在此基础上,; 进而研究了该分子与不同银簇作用时的拉曼光谱,结果表明,4MPY以巯基硫与银簇作用形成强的Ag-; S键,导致拉曼光谱的线型不依赖于所选银簇的大小。接着我们考虑了吡啶氮端作用的两种情况。(1)当4MPY-银簇复合物同时以吡啶氮与水簇或水合质子簇; 形成氢键时,结果表明吡啶环的部分振动频率随氢键和质子化发生蓝移。(2)当考虑吡啶氮与银簇作用时,吡啶环三角畸变振动发生蓝移。上述情况不仅解释了实; 验观测的振动频率变化,而且表明了化学环境改变对相对拉曼强度的影响。最后,我们计算了当对巯基吡啶分子以单端或双端与银簇作用,在考虑激发光与低能激发; 态的能量匹配时,拉曼光谱强度与低能激发态的关系。计算结果表明,在双端吸附构型下,与吡啶氮成键的银簇受激发产生电荷转移态,不仅导致吡啶环v_(12; )、 v_1和v_(8a)振动的拉曼信号增强,而且选择性地增强吡啶环C-H面内对称弯曲振动v_(9a)的拉曼信号。Surface-enhanced Raman spectroscopy (SERS) is one of the most powerful techniques for obtaining fingerprint information on molecules adsorbed on coinage metal surfaces. Its detection sensitivity has reached the single-molecule level. On the basis of density functional theoretical (DFT) calculations and Raman scattering theory, we investigated the normal Raman spectra of two isomers and surface-enhanced Raman scattering (SERS) spectra of 4-mercaptopyridine (4MPY) adsorbed on silver. The results aided us in uncovering the relationships between normal Raman spectra and SERS spectra and adsorption configuration, tautomerization, protonation, and hydrogen bonding interactions as well as low-lying excited states. First, we compared the relative stability and normal Raman spectra of two isomers of 4MPY in the gas phase and aqueous solution with a solvent model similar to the solvation model of density (SMD). We then studied the Raman spectra of 4MPY interacting with silver clusters. Our results indicate that the Raman spectra were not dependent on the size of the silver clusters, owing to the formation of strong Ag-S bonds. We also considered two cases of N-end interaction in the 4MPY-Ag-5 complex. (1) For the hydrogen bond interaction between the nitrogen in 4MPY and water clusters or hydrated proton clusters, the theoretical results indicated that the vibrational frequencies of the pyridine ring increase. (2) For the interaction of the 4MPY-Ag-5 complex with a silver cluster Ag-4 through the lone-paired orbital in nitrogen of the pyridine ring, the theoretical results further revealed that the vibrational frequency shift is in good agreement with SERS peaks reported in the literature. Finally, our calculated results focused on the relationship between the Raman spectra and the charge transfer mechanism when the excitation photonic energy matches the transition energy of low-lying excited states in single-end and double-end adsorption configuration. Particularly for the case of the double-end adsorption configuration, the charge transfer states from the excitation from the silver cluster binding to the pyridine ring not only enhance the Raman signals of v(12), v(1), and v(8a) modes, but also selectively enhance the Raman signal of the v(9a) mode associated with the symmetric C-H in-plane bending vibration.国家自然科学基金（21273182,21533006,21373172）资助项

Design of Auto Gain Control Circuit with Two-stage Amplification Feedback

设计了一种适用于移动水声通信接收系统的两级放大反馈自动增益控制电路。该电路采用初级放大—滤波—次级放大的信号调理机制,反馈回路同时对两级放大电路进行增益控制,使输出信号稳定在期望值附近,能有效解决移动水声通信中由于收发端相对距离变化、声传播衰减、信道频率选择性衰落、收发端电路频率响应不均匀等因素引起的接收信号时域和频域起伏变化大的问题。海上试验表明:该电路具有良好的幅度均衡性能,能显著提高水声通信质量。An auto gain control(AGC) circuit with two-stage amplification feedback for the receivers of underwater acoustic mobile communication system was presented.The circuit uses the conditioning mechanism of primary amplification—filter—secondary amplification,and the feedback loop controls gains of the two stages amplifiers,making the output signal be stable near the dexpectations so as to effectively solve the problem of signal fluctuation in the time and frequency domains caused by the distance change between transmitter and receiver,sound propagation attenuation,frequency selective fading of underwater acoustics channel and the uneven frequency response of transmitting and receiving circuit.The sea test shows that the circuit has a good performance at amplitude equalization,and can greatly improve the quality of underwater acoustic communication.国家自然科学基金项目(41376040);; 福建省中青年教师教育科研项目(JA15001);; 国家海洋局海洋公益项目(201505027-2

社团文化视角下的图书馆文化建设探究——以厦门大学图书馆为例

社团文化是校园文化建设的重要部分,图书馆是校园文化建设的中心地带。为了推动社团文化、图书馆文化乃至校园文化的整体发展,本文从社团文化视角下对图书馆文化建设展开研究,阐述了社团文化及图书馆文化的基本内涵,提出了将社团文化融入图书馆文化建设的重要意义和基本思路,并介绍了厦门大学图书馆的实践经验

Environment Security Monitoring System for Offshore Caged Fish and Water Quality

为了更好地开展渔业养殖中深水网箱中鱼群状态与水质环境的安全监测,提出了一种深水网箱鱼群与水质环境安全远程监测系统.该系统使用声学方式对鱼群分布状况进行监测;同时采用传感器对水质环境的温度、溶解氧、p H值等进行监测,监测结果通过无线数据传输方式实时传送至微处理器,完成信号去噪、数据提取、显示及报警等.实验结果表明,该监测系统性能稳定可靠,结合嵌入式控制技术与无线数据传输技术,监测操作简便,移动性好;同时兼顾鱼群与水质环境安全,监测更全面到位,在推广深水网箱养殖安全配套设施上具有良好的应用前景.Environment monitoring of fish activity state and water quality is the key to offshore cage safety management.A remote monitoring system for offshore caged fish and water quality is developed in the research.The fish distribution and abundance are monitored strategically using acoustic transducers in the system.Meanwhile,some parameters of water quality are obtained using various sensors,such as temperature sensor,dissolved oxygen sensor and p H sensor. Then the collected data are sent to the user monitor terminal in real time through wireless transmission module.Finally,the results are displayed on a 7-inch liquid crystal display screen( LCD) after data processing. The experiment has been conducted to verify the excellent performance of this system.Combined with embedded control technology and wireless data transmission technology,the flexibility and mobility are improved significantly. Besides,both fish activity and water quality are taken into account,making the monitoring more comprehensive.The results suggest that the system has good application prospects.国家海洋局海洋公益性行业科研专项(201505027-2

福建省电力工业发展与对策研究

剖析福建省电力工业现状及发展存在问题,如火电和水电比重过大、未来核电容量大、电力负荷中心与电厂空间布局不一致以及电网建设滞后等。提出了调整电力结构、合理布局电厂、加大电网投资以及加快能源储备基地建设等对策措施。核电选址中应考虑的海洋要素专题研究(国家海洋局海域管理司资助

间歇式轴向压应力对组织工程骨种子细胞的黏附增殖与成骨分化促进作用的研究

目的探究间歇式轴向压应力对组织工程骨种子细胞黏附、增殖与成骨分化能力的影响。方法构建表达绿色荧光蛋白的兔骨髓间充质干细胞(rBMSCs)作为示踪种子细胞,运用旋转细胞培养仪将松质骨支架和种子细胞共培养7 d获得组织工程骨(TEB),实验组在第7～14天施加大小10 N、频率1 Hz、4 h/d的间歇式轴向压应力刺激,对照组常规培养,14 d后胰酶消化法获取两组种子细胞并比较其黏附、增殖和成骨分化能力。采用两组独立样本t检验进行统计学分析。结果 (1)流式细胞术显示rBMSCs被成功提取分离。(2)倒置荧光显微镜及扫描电镜显示TEB中种子细胞与支架相容性良好。(3)活体荧光成像系统及扫描电镜显示应力刺激组种子细胞的生长状况要优于非应力刺激组,前者平均荧光密度及细胞数/500倍视野均大于后者,差异均具有统计学意义(平均荧光密度:(3.75±0.34)×108 vs(2.91±0.22)×108,t=2.90,P=0.04;细胞数/500倍视野:30.50±4.43 vs 21.00±5.13,t=3.14,P=0.01)。(4)细胞黏附实验显示,应力刺激组种子细胞的75﹪细胞贴壁时间短于非应力刺激组,两组时间分别为(3.00±0.41) h、(13.33±1.70)h,差异具有统计学意义(t=8.20,P <0.01),前者的最终细胞贴壁率高于后者(99.97﹪±0.34﹪vs 85.83﹪±1.18﹪),差异具有统计学意义(t=11.31,P <0.01)。(5) CCK-8检测显示,在培养第48～96 h,应力刺激组种子细胞的增殖能力优于非应力刺激组,将两者的450 nm吸光度值在第48小时(0.49±0.02、0.40±0.02)、72 h(0.76±0.07、0.64±0.04)和96 h(1.58±0.07、1.34±0.13)分别进行比较,差异均具有统计学意义(t=5.15、2.57、2.86,P均<0.01)。(6)在成骨诱导14 d后,应力刺激组种子细胞的ALP和Ca结节染色阳性率要强于非应力刺激组:两组ALP染色阳性率分别为26.73﹪±4.56﹪、16.68﹪±3.89﹪,差异具有统计学意义(t=3.33,P=0.03);两组Ca结节染色阳性率分别为41.81﹪±3.56﹪、27.40﹪±2.35﹪,差异具有统计学意义(t=3.68,P=0.02)。结论间歇性轴向压应力可促进组织工程骨种子细胞的黏附、增殖与成骨分化

天然高分子甲壳素类纤维的研究进展

:综述了甲壳素及其衍生物纤维的制备和性能 .介绍了制备甲壳素纤维的黄化法、含卤溶剂法和酰胺 氯化锂法 .总结了壳聚糖纤维制备的一般方法和性能 .简要介绍了甲壳素 /壳聚糖酯类和醚类衍生物的纤维 .讨论了甲壳素类纤维的应

甲壳素类液晶高分子的研究 Ⅰ侧基长度对羧酰化甲壳素的液晶性的影响

四种羧酰化甲壳素即乙酰化、丙酰化、丁酰化和己酰化甲壳素在二氯乙酸溶液中均呈现胆甾型溶致液晶相．临界浓度随侧基长度增加而略有增加，衍生物的临界浓度明显都比原甲壳素高许多，这些规律都可以用链刚性的变化来解释．四种羧酰化甲壳素在剪切时均能形成条带织构，而且能形成条带织构的最低浓度有明显差别，随侧基长度增加而提高，进一步表明侧基较长，液晶性减少