Study on Radiation Characteristic and Dynamic Behavior of Atmospheric Pressure Glow Discharge Plasma in Air

空气在常压下的辉光放电（即APGD：AtmosphericPressureGlowDischarge）生成的低温等离子在航空、材料表面改性、环境保护、臭氧合成、医学等诸多领域有着重要的应用价值，对其进行深入研究是非常有意义的。本文设计了常压下空气辉光放电装置，并在电极板平面上产生了一薄层的表面低温等离子体。针对产生出的表面等离子体具有光、声、热辐射特性，设计合理的实验测量方案，分别利用光栅光谱仪测量系统、噪音计以及红外测温仪首次对这种APGD等离子体的光辐射、声辐射及热辐射特性进行了非接触式测量分析。分析结果表明，APGD等离子体的辐射光谱面积积分平均值和光谱最高峰值平均值随加载功率变化均呈线...The applications of low temperature plasma due to atmospheric pressure glow discharge (APGD) in air are very important and valuable in many fields, such as, aviation, surface modification of material, environmental protection, ozone generation and medicine field, and so on. It is very significant to further study the APGD plasma. In this paper, a thin layer low temperature plasma due to a...学位：工学硕士院系专业：物理与机电工程学院机电工程系_精密仪器及机械学号：20032900

A Study on our stock market issuing mechanism evolution and IPO efficiency

我国股票市场起步于上世纪90年代初，经历二十多年的快速发展，已经初具规模。但值得我们注意的是，我国股票市场长期存在较严重的IPO效率的扭曲，如我国A股市场存在较严重的IPO抑价现象，过高的IPO抑价率严重妨碍了资本市场资源配置功能的发挥。鉴于此，我国监管部门先后对我国的新股发行监管制度、新股发行定价机制和新股发行方式进行了一系列的市场化改革，但这一系列的市场化改革是否有效，是否真正的改善了我国IPO效率扭曲现象，本文试图通过理论和实证相结合的角度对该问题进行解答。 为能更全面的反映我国的IPO效率，本文改变过去众多文献单纯采用新股首日涨幅作为IPO效率衡量指标的做法，从IPO定价效率和IPO...Our stock market started at 90’s of last century. Until now it has developed rapidly for more than twenty years. But it is notable that there is high IPO efficiency distortion ,such as the high degree of IPO underpricing in the China stock market. Under-pricing high rate fundamentally hinder the allocation of resources of capital markets function. To improve the IPO efficiency a series of reformat...学位：经济学硕士院系专业：经济学院金融系_投资学学号：1562007115145

Radiation characteristic measurement of low temperature plasma under atmospheric pressure

本文在自行设计的放电电极板上实现常压下的空气辉光放电(APGD),产生出一薄层的低温等离子体,利用光栅单色仪及测试声强和温度的仪器对所产生的等离子体的光辐射、声辐射和热辐射特性进行实验测量。数据处理后的分析结果表明,该APGD等离子体的光辐射强度及声辐射和热辐射强度,以及总辐射能量基本上都与电极板的加载功率呈线性关系,而且各种形式的能量各占比例是一定的。研究结果表明可以通过沿面APGD的辐射特性与加载功率之间的关系来描述APGD等离子体的特性,以及控制等离子体的产生量。A thin layer of the low temperature plasma due to Atmospheric Pressure Glow Discharge (APGD) in air was produced on the planar surface of designed electrode plates. The optical, acoustic and thermal radiation characteristics of the produced plasma were measured in experiment with a grating spectrograph system, a sound level meter and a non-contact thermometer, respectively. The analysis results from the data processed indicate that the intensity of the optical, acoustical and thermal radiation of the APGD plasma grow linearly up with the increasing power applied to the electrode plate, which demonstrates that the total radiance varies linearly with the power and that every kind of radiant energy has a proper proportion. The study shows that it is feasible to describe the behavior of the APGD plasma and to control it quantitatively by the obtained relationship between its radiation characteristic and applied power.福建省自然科学基金(A0410001

Inductive effect of multiple cytokines on bone regeneration

临床上对创伤、感染和肿瘤切除后所造成大范围骨缺损的修复至今未得到有效的解决。在移植物材料中的生物活性物质(主要为细胞因子)能对其周围组织及长入移植物中的纤维组织发生诱导作用,使其向骨组织方向生长,从而促进骨缺损区的修复。国内外研究报道多种生物活性因子具有诱导成骨细胞的生长,抑制破骨细胞之间、破骨细胞与基质之间的黏附,具有诱导骨再生的能力。文章总结近年来细胞因子对诱导骨再生修复的影响及其进展,为具有骨诱导作用的细胞因子进行骨再生修复研究奠定基础。The reparation of extensive bone defects caused by the excision of trauma, infection and tumor on clinic has not been resolved availably.The biological active substances (mainly cytokines) in the graft material had inductive effect on the surrounding tissue and ingrowing fibrous tissue, which could direct the growth to the bone tissue, so as to promote the restoration of bone defects.Studies reported that a wide range of biologically active factor has the capacity of inducing regeneration of the bone by inducing the osteoblasts growth, and inhibiting the adhesion between osteoclasts, or between osreoclast and matrix.This paper summarized the effect of multiple cytokines on bone regeneration, which can provide a basis for the research of Inductive effect of multiple cytokines on bone regeneration

Synthesis of nir-sensitive Au-Au2S nanocolloids for drug delivery

Near IR (NIR) sensitive Au-Au2S nanocolloids were prepared by mixing HAuCl4 and Na2S in aqueous solutions. An anti-tumor drug, cis-platin, was adsorbed onto Au-Au2S nanoparticle surface via the 11-mercaptoundecanoic acid (MUA) layers. The results show that the degree of adsorption of cis-platin onto Au-Au2S nanoparticles was controlled by the solution pH value, and the drug release was sensitive to near-infrared irradiation. The cis-platin-loaded Au-Au2S nanocolloids can be potentially applied as NIR activated drug delivery carrier. (C) 2002 Elsevier Science B.V All rights reserved

Experimental study of using GSPS for in situ osteogenesis induction on rabbit skull

目的:研究明胶-硅氧烷多孔支架材料混合多种材料用以原位诱导兔颅骨再生的效果。方法:采用可降解、具有双孔径的明胶-硅氧烷多孔支架材料,并复合bMP2和兔骨髓间充质干细胞,在去骨瓣减压手术时将材料置于骨窗上,同时采用空白对照来探讨兔颅骨原位诱导再生。用高速螺旋CT扫描颅骨并三维重建来测量颅骨缺损的愈合情况,并作出比较。结果:支架材料+bMP组动物的颅骨修复率与支架材料+红骨髓组动物的修复率相当(P=0.43);支架材料+红骨髓组动物的颅骨修复率高于单纯支架材料组动物的修复率(P=0.01);单纯支架材料组动物的颅骨修复率与空白对照组动物的修复率无明显差别(P=0.18)。结论:明胶-硅氧烷-CA(nO3)2多孔复合支架材料分别与bMP以及红骨髓混合使用能够明显提高颅骨缺损的骨愈合速度以及修复率;而单纯使用支架材料并不能促进实验动物的颅骨修复。Objective:To investigate the effect of using GSPS for in situ osteogenesis induction on rabbit skull.Methods:The biodegradable,with double-aperture gelatin -siloxane porous scaffold materials was mixed with BMP2 or rabbit bone marrow mesenchymal stem cells to fix the skull bone deficit after craniectomy decompression.A blank control was set to compare with the effect of in situ osteogenesis of rabbit skull.High-speed spiral CT scanning and three-dimensional reconstruction of the skull was performed to inspect the healing progress of skull defects.Results:The GSPS + BMP group had the equal bone healing rate as the GSPS+ bone marrow group (P=0.43); and the GSPS + bone marrow group had the higher bone healing rate than the GSPS group (P =0.01).There were no significant difference on bone healing rate between GSPS group and blank control group (P=0.18).Conclusion:Gelatin-siloxane-Ca (NO3) 2 porous scaffolds could be used with the BMP,as well as red bone marrow to improve the bone healing of skull bone defect while no significant effect could be observed using GSPS solely

Comparison of the preparation methods of Temozolomide-loaded nanoparticles

目的比较载替莫唑胺聚氰基丙烯酸正丁酯纳米粒(TMz-PbCA-nP)的不同制备方法,确定最佳制备工艺。方法以α-氰基丙烯酸正丁酯(bCA)为载体,分别采用乳化聚合法和界面聚合法制备TMz-PbCA-nP,加以吐温-80(T-80)进行表面修饰,并通过zETA电位仪检测纳米粒粒径和电位、透射电镜观察纳米粒形态、紫外分光光度计测定各自的包封率和载药量。结果乳化聚合法制备的TMz-PbCA-nP平均粒径(135.8±11.3)nM,表面电位(-24.8±2.2)MV,包封率(44.23±2.04)%,载药量(2.80±0.05)%;界面聚合法制得的载药纳米粒平均粒径(175.4±10.2)nM,表面电位(-18.3±3.6)MV,包封率(44.35±2.58)%,载药量(2.31±0.47)%。透射电镜下观察两种方法所制备的纳米粒大小均较为均匀,粒子间无明显聚集。结论采用乳化聚合法制备TMz-PbCA-nP效果较优于界面聚合法。【Objective】 To compare Temozolomide polybutylcyanoacrylate nanoparticles(TMZ-PBCA-NP) prepared by two different methods so as to determine the optimal process.【Methods】 TMZ-PBCA-NP was prepared by emulsion polymerization and interfacial polymerization methods separately and the surfaces of the two kinds of nanoparticles were both modified with tween-80(T-80).Zeta potential instrument was used to detect the particle size and charge and transmission electron microscopy was employed to study the particle shape.The entrapment efficiency and drug loading were determined with ultraviolet spectrophotometry.【Results】 The mean particle size,surface charge,entrapment efficiency and drug loading of the NP prepared by emulsion polymerization and interfacial polymerization methods was(135.8±11.3) nm and(175.4±10.2) nm,(-24.8±2.2) mV and(-18.3±3.6) mV,(44.23±2.04) % and(44.35±2.58) %,(2.80±0.05) % and(2.31±0.47) %,respectively.Both nanoparticles had uniform size distribution and no apparent aggregation according to transmission electron microscopy.【Conclusion】 The emulsion polymerization method is better than interfacial polymerization method in preparing TMZ-PBCA-NP.国家自然科学基金(No:81172394

Preparation and characterization of collagen-chitosan composites

In this article, nature derived collagen was mixed with chitosan and crosslinked by formaldehyde to form a homogeneous composite membrane. The microstructure of the composite was characterized by transmission electron microscopy and differential scanning calorimetry. Mechanical and swelling properties of the composite were improved compared with pure collagen and can be modulated via changing the crosslinking conditions, such as pH, time, and concentration. (C) 1997 John Wiley & Sons, Inc

Synthesis and characterization of gelatin-siloxane hybrids derived through sol-gel procedure

A new type of inorganic-organic hybrid materials incorporating gelatin and 3-(glycidoxypropyl) trimethoxysilane (GPSM) was prepared through sol-gel processing. A solid-state Si-29 NMR analysis indicated that all the methoxy silane groups of GPSM were polymerized to yield -Si-O-Si- bridging bonds. An amino acid analysis confirmed grafting reactions of GPSM against gelatin chains. The increasing GPSM/gelatin ratio stimulated gel formation, phase separation, and the density of GPSM-crosslinking of the gelatin chains as well as it changed the micro- and macro- structures and the viscoelastic properties of the final products