官能化噻咯合成研究进展 Ⅱ.交联法、取代法、硼化法与硅烷化法

官能化噻咯(silole音译)是一种重要的噻咯衍生物,不仅在有机金属合成领域占重要地位,也是建构新型π共轭体系的重要组成部分。本文介绍了官能化噻咯的几种重要合成方法,并对各种方法的特点及适用范围作了分析和总结

Theoretical Study on the Electronic Structures of Small Ti_nN_m(n+m=5,6)Clusters

45 isomers of TinNm(n + m=5=6) clusters=including linear=some planar and some stero configurations=have been predicted by density functional theory method.For five-atom clusters Ti3N2 and Ti2N3=the most stable structures are trigonal bipyramid in D3h symmetry=and for Ti4N cluster=the isomer with one nitrogen atom occupying the center of quasi-tetrahedron is the most stable.In the isomers of Ti4N2 and Ti3N3=the planar networks are more stable=but for Ti2N4=the six-membered ring configuration is the most favorable.Most linear structures can form weak-strong bonds alternately with higher energy.As regards to planar structures=the more Ti-N bonds are formed=the more stable they will be;for stero closed polyhedral isomers=their energies are lower

Determination of Iron in Coastal Zone Water with Improved National Standard Method

为了更加准确地检测海岸带水体中的铁含量,将邻菲啰啉分光光度法测定水质铁(国标法)的方法进行了改进。在邻菲啰啉分光光度法的基础上,在p H调节方式、比色皿皿差和显色剂三个方面进行改进。结果表明,改进后方法的线性、准确度和精密度都优于国标法。但改变p H调节方式和扣除比色皿皿差后检测低浓度铁的水样的精密度依然较差(RSD>5%),说明邻菲啰啉的灵敏度较低。以5-Br-PADAP为显色剂用分光光度法检测水样时,方法的准确度和精密度较好(RSD<5%,加标回收率在96.0%~106%之间),该方法可以用于海岸带水体中铁的检测

Ti_xN_y团簇结构的密度泛函研究

采用杂化密度泛函方法(B3LYP)和有效核势基组预测了Ti_xN_y(x≤3,y≤2)团簇的结构及稳定性,并分析了可能存在构型的电子结构.结果表明Ti_2N中体系的自旋多重度由Ti原子决定.Ti_3N中随着N的配位数增加,N的负电荷增加,平均每个Ti向N提供约0.3个电子.从Ti_2N_2可能稳定构型分析,成键数目越多,能量上越有利,且Ti—N键的数目的增加,将削弱N—N间的成键

自动复位通配型安全手术刀柄的设计

目的克服普通手术刀柄所装载的刀片裸露易误刺、术中必须采取被动防护措施等缺欠,并提高依从性、适配性及经济性。方法参照并遵从国标,借鉴课题组昔研的滑移护刃鞘、卡簧定位钮及闭式自动复位等相关专利设计了安全便捷的\"内藏式自动复位捷卸式通配型并置刀架\",益于直接安全传递。结果通过外科医生及手术室护士实际装卸刀片并进行问卷调查统计,结果显示自动刀柄装卸用时更短(P<0.05),医护的使用满意率更高(P<0.05)。结论自动刀柄保险御刺、舒握抗损、简骤增效、降耗环保、以一代多、人机和谐、便携易储。福建省医学创新课题(2017-CXB-21

Photogenerated Cathodic Protection Properties of a TiO_2 Nanowire Film Prepared by a Hydrothermal Method

Corresponding author. Email: [email protected]; Tel: +86-592-2189192.[中文文摘]应用水热法在钛箔表面制备TiO2纳米线薄膜,采用场发射扫描电子显微镜、X射线衍射和紫外-可见分光光度法对薄膜进行表征,用电极电位和电化学阻抗谱考察TiO2光生阴极保护性能.结果表明:薄膜由纵横交错的锐钛矿型TiO2纳米线组成,纳米线的直径约10nm.在150℃下反应6h生成的TiO2纳米线薄膜在0.3mol·L-1 Na2SO4溶液和0.3mol·L-1 Na2SO4+0.5mol·L-1 HCOOH混合溶液中对与TiO2薄膜耦连的403不锈钢均有良好的阴极保护效应.TiO2膜所在溶液中含有HCOOH时,可使耦连的403不锈钢在0.5mol·L-1 NaCl溶液中电极电位负移约545mV,界面反应电阻显著变小,表明电解质溶液加入HCOOH可以增强TiO2纳米线薄膜对403不锈钢的光生阴极保护效应.[英文文摘]A TiO2 film was synthesized on the surface of a Ti substrate by a hydrothermal method,followed by acid treatment and calcination.The properties of the TiO2 film were characterized by scanning electron microscopy,X-ray diffraction,and ultraviolet-visible spectrophotometry.The photogenerated cathodic protection properties of the TiO2 film were investigated by electrochemical techniques.The corrosion performance of 403 stainless steel coupled to a TiO2 film photoanode in different solutions was evaluated by photogenerated potential and electrochemical impedance spectroscopy. The results showed that the TiO2 film was composed of many randomly-oriented anatase nanowires of about 10 nm in diameter. The TiO2 nanowire film prepared by the hydrothermal reaction at 150 ℃ for 6 h was used for the photogenerated cathodic protection of 403 stainless steel. When we coupled the steel in a 0.5 mol·L -1 NaCl solution to the TiO2 film photoanode in a mixed solution containing 0.3 mol·L-1 Na2SO4 and 0.5 mol·L-1 HCOOH, its potential decreased by 545 mV. Additionally, the charge transfer resistance of the electrode reaction process for the coupled steel decreased considerably. The results also indicated that the HCOOH in the mixed solution improved the photogenerated cathodic protection of the TiO2 film photoanode.国家高技术研究发展专项(2009AA03Z327); 国家科技支撑计划项目(2007BAB27B04)资

Identification and analysis of odor of patients with exterior syndrome based on medical electronic nose

目的:运用自主研发的医用电子鼻探讨表证患者口腔呼气的气味图谱特征及气味识别准确率。方法:选择表证青年患者150例和健康青年人200名,运用基于薄膜型气体传感器阵列技术的医用电子鼻(nAnOfIlM-EnOSE MEdICAl001)采集口腔呼气的气味图谱,以响应曲线的振幅和上升斜率作为曲线特征,分析表证患者及其寒热病性的图谱特征,并进行判别分析。结果:表寒证和表热证患者的气味图谱响应曲线A、b、d、E、g、H的振幅和上升斜率均显著高于健康学生(P<0.01)。表热证患者的气味图谱响应曲线A、b、d、E、H的振幅和上升斜率均显著高于表寒证患者(P<0.05,P<0.01),表热证患者的气味图谱响应曲线g的振幅显著高于表寒证患者(P<0.01)。判别分析显示对健康青年人、表寒证青年患者、表热证青年患者口腔呼气的识别准确率分别为90.5%、86.5%、88.0%,对全部案例的识别准确率为89.1%。结论:表证青年患者口腔呼气的气味较健康青年人浓烈,且表热证青年患者气味变化较表寒证青年患者更明显,本医用电子鼻能够较为敏感和准确地辨识表证青年患者口腔呼气的气味特征及其寒热病性。医用电子鼻技术的发展可为中医嗅诊客观化研究提供手段和方法。Objective: to explore the odor response pattern characteristics of oral breath of patients with exterior syndrome and accuracy rates of odor identiication by medical electronic nose which was independent research and development.Methods: 150 young patients with exterior syndrome and 200 healthy young students were observed.Odor response patterns of oral breath were collected by the electronic nose(Nanoilm-Enose Medical001) based on a ilm of gas sensor array.The amplitude and rising slope of response curves were selected as curve characteristics to analyze pattern characteristics of exterior syndrome including exterior cold syndrome and exterior heat syndrome,and discriminant analysis was done.Results: In odor response patterns of patients with exterior cold syndrome and with exterior heat syndrome,the amplitudes and rising slopes of response curve A,B,D,E,G and H were signiicantly higher than those of healthy students(P<0.01).In odor response patterns of patients with exterior heat syndrome,the amplitudes and rising slopes of response curve A,B,D,E and H were signiicantly higher than those of patients with exterior cold syndrome(P<0.05,P<0.01),and the amplitude of response curve G was signiicantly higher than that of patients with exterior cold syndrome(P<0.01).Discriminant analysis showed that the accuracy rate of oral breath identiication of healthy students,patients with exterior cold syndrome and patients with exterior heat syndrome was 90.5%,86.5% and 88.0% respectively,and the accuracy rate of all cases was 89.1%.Conclusion: The odors of oral breath of patients with exterior syndrome were signiicantly stronger than those of healthy people.The odors of patients with exterior heat syndrome were signiicantly stronger than those of patients with exterior cold syndrome.This medical electronic nose could distinguish odor characteristic of oral breath of patients with exterior syndrome sensitively and accurately;and it could also distinguish odor characteristic of exterior cold syndrome from exterior heat syndrome.The development of medical electronic nose could provide a kind of new means for the study on the objectiication of TCM smelling examination.国家自然科学基金项目(No.30901899); 福建省教育厅A类项目(No.JA09132)~

Anticorrosion Properties of Modified Nano-TiO_2 Films Prepared by Sol-Gel Method

应用溶胶-凝胶法和浸渍提拉技术在316l不锈钢表面分别制备TIO2纳米膜和 b-fE-CE改性的TIO2纳米膜. 采用场发射扫描电子显微镜(fE-SEM)、原子力显微镜(AfM)、拉曼光谱法和能量分散谱(EdS)对薄膜进行表征,通过电化学阻抗谱(EIS)和动电位阳极极化曲线的测试考察薄膜的耐蚀性及对不锈钢的保护性能. 结果表明:两种纳米薄膜均含锐钛矿型的TIO2纳米颗粒,纯TIO2纳米膜与改性后的纳米膜中颗粒直径分别约为15和10 nM. TIO2/316l不锈钢和 b-fE-CE-TIO2/316l不锈钢膜电极浸泡在0.5 MO.ll-1 nACl溶液后,后者的电化学反应电阻较大,动电位阳极极化曲线的稳定钝化区较宽,击穿电位更高,说明改性的纳米膜的耐蚀性及其保护性能更好.TiO2 and B-Fe-Ce-modified TiO2 films were synthesized on the surfaces of 316L stainless steel(316L SS) substrates using a sol-gel and dip-coating method.The properties of the films were characterized by field emission scanning electron microscopy,atomic force microscopy,Raman spectroscopy and energy dispersive spectrometry.The corrosion resistance of the films and their ability to protect stainless steel were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization curves.Both TiO2 and B-Fe-Ce-modified TiO2 films were composed of anatase nanoparticles about 15 and 10 nm in diameter,respectively.Impedance spectra of the stainless steel substrates coated TiO2 films contained semicircles for capacitive reactance in 0.5 mol.L-1 NaCl solution,but the charge transfer resistance of the B-Fe-Ce-TiO2/316L SS electrode was higher than that of the TiO2/316L SS electrode.The potentiodynamic anodic polarization curve of the B-Fe-Ce-TiO2/316L SS electrode showed a larger stable passive region and a higher breakdown potential than the TiO2/316L SS electrode,indicating that the modified film had better corrosion resistance and protective properties for 316L SS.国家高技术研究发展计划项目(863)(2009AA03Z327);国家自然科学基金(21073151和21173177)资助---

Theoretical Study on the Electronic Structures of Small TinNm (n + m=5, 6) Clusters

45 isomers of TinNm (n + m = 5, 6) clusters, including linear, some planar and some stero configurations, have been predicted by density functional theory method. For five-atom clusters Ti3N2 and Ti2N3, the most stable structures are trigonal bipyramid in D-3h symmetry, and for Ti4N cluster, the isomer with one nitrogen atom occupying the center of quasi-tetrahedron is the most stable. In the isomers Of Ti4N2 and Ti3N3, the planar networks are more stable, but for Ti2N4, the six-membered ring configuration is the most favorable. Most linear structures can form weak-strong bonds alternately with higher energy. As regards to planar structures, the more Ti-N bonds are formed, the more stable they will be; for stero closed polyhedral isomers, their energies are lower.National Natural Science Foundation of China [20503021]; Natural Science Foundation of Fujian [2005HZ01