93 research outputs found

    In situ FTIR Spectroscopic Studies of (Bi)sulfate Adsorption and Electrocatalytic Reaction of Aspartic Acid on Nanostructured Metal Electrodes

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    本论文运用电化学循环伏安法(CV)和原位红外反射光谱(insituFTIRS)系统地研究了硫酸阴离子在各种反射率基底上的Pt纳米粒子电极(nm-Pt/S(n),S=GC,Pt,Au)表面的吸附,以及不同pH值溶液中门冬氨酸(Asp)在本体Au和纳米Au电极表面的电催化过程,主要结果如下: 1、硫酸阴离子在纳米Pt电极上的吸附。首次发现所制备的纳米Pt电极对硫酸阴离子的吸附表现出异常红外效应(AIREs),即吸附态的硫酸阴离子在nm-Pt/S(n)电极上给出谱峰方向倒反、谱峰强度增强的红外光谱特征。该研究不仅首次将AIREs现象由强吸附物种(如CO、CN-和SCN-等)拓展到弱吸附物种(硫酸阴...Cyclic voltammetry (CV) and in situ FTIR spectroscopy (in situ FTIRS) were applied to the study of the adsorption of (bi)sulfate on Pt nanoparticles substrated on materials with different IR reflectivity (nm-Pt/S(n), S = GC, Pt, Au) and electrocatalytic reaction of aspartic acid (Asp) on bulk and nanostructured Au electrodes. The main results are summarized below. 1. Study of the adsorption of (b...学位:理学博士院系专业:化学化工学院化学系_物理化学(含化学物理)学号:B20032502

    Analysis and Design of Personnel Management Information System for a College

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    经济和技术的快速发展,带动着社会各方面的快速发展,高等教育制度面临着新一轮的改革,这样一来,高校人事管理制度的完善和创新对于高等教育的发展有着重要作用。现代人事管理系统都是以三大技术(网络技术、信息技术以及计算机技术)为基础的前提下建立起来的,人事管理系统的建设为高校人事管理带来了前所未有的改观和贡献,促进了高校人事管理的科学化、现代化和统一化,大大提高了高校人事管理效率。 本论文利用现有较成熟的计算机技术并结合高校人事管理的实际需求以及国内外发展现状,完成了高等院校人事管理系统的分析和设计工作。系统较充分地考虑了高校人事管理的日常管理需求、管理人员的方便性、互操作性。不仅能够为用户提供很好...The increasingly development of economic and technology, driving the rapid development of various aspects in the society, system of higher education is facing a new round of reform, so the improvement and innovation of higher institution personnel management system plays an important role. Modern personnel management system is based on three major technology, network technology, information techno...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201223006

    从政治参与的角度考察我国坚持陪审制度的现实性

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    陪审制度的本质是一种重要的民主政治的政治思想和司法功能的体现,陪审制度的确立和完善,是人类走向民主文明的司法形式之一。本文认为重新认识陪审制度的价值双重性,彰显陪审制度的政治价值与司法价值,在推进公众政治参与需求下,完善我国的人民陪审制,已然成为法学理论界及司法实务界应重新认识的重要课题

    Ⅰ级粉煤灰对水泥净浆开裂的影响

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    采用环约束法,试验研究了Ⅰ级粉煤灰对不同水胶比下水泥净浆开裂的影响。试验研究发现:Ⅰ级粉煤灰在低水胶比(0.24)情况下对净浆开裂几乎没有影响,当水胶比为0.32和0.40时抗裂作用明显;较高水胶比(0.32、0.40)情况下,Ⅰ级粉煤灰对净浆的抗裂性能有较好的改善作用,在20%~65%掺量范围内,随着掺量的增大,净浆的开裂龄期延长,抗裂性能提高

    Assessment of impact of intensive livestock cultivation on water environment in mountain and hilly areas of South China

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    [摘要]选择南方山地丘陵区典型规模畜禽养殖集中地为研究区域, 通过对该研究区域周边地表水及地下水的 调查采样, 分析主要污染物时空变异及污染物形态之间的变化, 并对周边水环境进行初步评价。结果表明: 规模化畜禽养殖区域的浅层地下水和地表水已经受到严重污染; 养殖场的环保处理设施与养殖规模不配套 造成大量污染物进入地表水环境; 生物氧化塘的护堤和塘底未经防渗处理, 造成下游地下水污染; 养殖场排 放的污水经厌氧和好氧生物处理后富含有机质、氨氮、可溶态有机磷, 利于作物吸收和生长, 应尽量循环使 用。指出由于养殖污水变化较大, 为避免二次环境污染, 必须处理达标后结合配方施肥技术按需回用农田。[Abstract]By selecting a typical site of intensive livestock cultivation in a mountain area of South China as the study area, and investigating and sampling surface and groundwater in the study area, the spatial and temporal variat ions of the main pollutants and changes among pollutant forms were analyzed. The environmental effects of intensive livestock cultivation on surrounding water environments were evaluated. The results indicated that the shallow groundwater and surfacewater were heavily contaminated in the intensive livestock cultivation area. Large amounts of the pollutants entered the surface water, due to the fact that the wastewater treatment facility did not match the scale of livestock cult ivation. The lack of liner treatment of the bank and liner of the lagoon resulted in groundwater pollution. The effluent wastewater from the culturing farm after anaerobic and aerobic biologic treatment was full of organic matter, ammonia nitrogen, and dissolved organic phosphorus, which aided the growth of plants and should be recycled. Because of the significant change of the wastewater component, and in order to avoid secondary pollution, the wastewater should be recycled to land combined with precision fertilizer formula technology after treatment to bring it to the standard.福建省重大科技项目(2002H009);福州大学人才基金项目(XRC-0611

    罗格列酮对压力超负荷大鼠血流动力学及心肌肥厚的影响

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    【目的】探讨过氧化物酶体增殖物激活受体γ(PPAR-γ)配体罗格列酮对压力超负荷大鼠血流动力学及心肌肥厚的影响。【方法】30只SD大鼠随机分为假手术组(n=9)和压力超负荷模型组(n=21),应用腹主动脉缩窄的方法制作压力超负荷模型,将制作模型后24h仍存活的16只大鼠随机分为压力超负荷(PO)组(n=7)和罗格列酮(PO+Ros)组(n=9)。罗格列酮组给予罗格列酮3mg/(kg·d)共8周。8周后测定血流动力学;称量心脏质量;放射免疫分析方法测量血浆肾素活性、血管紧张素Ⅱ和醛固酮。【结果】与PO组相比,PO+Ros组动脉血压降低(P〈0.05);+dp/dtmax升高(P〈0.05);心脏质量指数和左室质量指数降低(P〈0.05);血浆肾素活性、血管紧张素Ⅱ、醛固酮和胰岛素及血糖水平无明显差异(P〉0.05)。【结论】PPAR-γ配体改善压力超负荷性心肌肥厚和左室舒缩功能,降低动脉血压,其效应与血浆肾素血管紧张素系统无明显关系

    Electrochemical behavior of p-dihydroxybenzene in DMPC biomimetic membrane

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    在金电极上构筑一种双肉豆蔻磷脂酰胆碱(DMPC)仿生浇铸膜。经椭圆偏振仪和电化学方法测量证实, DMPC仿生膜是较为致密的多层膜,同时对苯二酚能够透过DMPC仿生膜到达金电极表面进行氧化反应。结果表明,对苯二酚不仅可在脂质膜中进行电子转移,而且是一种重要的生物分子。反应在仿生环境内进行,也为研究生物小分子在真正的生物体内的反应提供有益的帮助。本文探讨对苯二酚在仿生膜修饰电极上的电化学行为,为生物膜中的电子转移过程提供了十分重要的信息。The casting method to form dimyristoyl phosphatidyl choline(DMPC)mimetic biomembrane on an Au electrode is proposed.The results of ellipsometer and electrochemical methods confirmed that the film is a compact membrane that can block the electron transferring process,p-Dihydroxybenzene can reach the electrode surface and occur redox reactions by passing through transient defects in individual bilayers.Such defects occur in biomembranes and are accentuated by relatively small electric fields.The electrochemical behavior of p-dihydroxybenzene in this membrane was also investigated,p-Dihydroxybenzene is biologically important molecule because of its function of transferring electrons in lipid layers.This reaction occur in the bionic environment,which provide the useful help to study the real reaction of small molecules in the biological organisms.Studies on the electrochemical behavior of p-dihydroxybenzene in the DMPC biomimetic membrane provide useful information for elucidating biological electron transfer processes concerning lipid layers.国家自然科学基金项目(20833005,20873116)。~

    纳米炭在甲状腺癌合并不同甲状腺疾病的示踪效果

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    【目的】探讨纳米炭混悬液在分化型甲状腺癌合并其他甲状腺疾病行颈中央区淋巴清扫中的示踪效果差异。【方法】回顾性分析2015 年7 月至2019 年7 月梅州市人民医院收治的分化型甲状腺癌患者共500 例, 将患者分为纳米炭组(A 组)314 例及非纳米炭组(B 组)186 例,并根据无合并疾病(亚组0)、合并多结节性甲状腺肿(亚组1)、合并桥本氏甲状腺炎(亚组2)或甲状腺癌灶较大(肿瘤最大径超过30 mm,亚组3),进一步将A、B 两组分成 4 个亚组,比较各组的淋巴结检获数及术后并发症的发生情况。【结果】A 组的淋巴结检获数和转移率均多于B 组[6.0(3.0 ~ 9.0)vs. 3.0(1.0 ~ 5.3),P 0.05),A2、A3 组术后甲状旁腺功能减退的发生率显著高于A0 组(51.8% vs. 34.1%,P < 0.05;54.2% vs. 34.1%,P < 0.05)。【结论】分化型甲状腺癌术中应用纳米炭可提高淋巴结的检获数,无合并疾病的作用效果最佳,合并多结节性甲状腺肿、癌灶过大可影响纳米炭的示踪效果,当癌灶最大径大于30 mm 时应用纳米炭对淋巴结的检出无明显作用

    纤维蛋白原在Pt电极上的界面电化学研究

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    应用电化学方法和电化学原位红外反射光谱(electrochemical in-situ FTIR)等研究了纤维蛋白原在Pt电极上的界面电化学行为.结果表明:纤维蛋白原在Pt电极上的吸附使电极的析氢与氧脱附过程减弱,影响程度随扫速的增加而增强;同样纤维蛋白原的吸附会降低亚铁氰化钾-铁氰化钾电对的氧化还原反应可逆性和电流;在-0.1~0.6V(vs.SCE)扫描范围内没有出现纤维蛋白原的特征"氧化还原"峰.电化学原位红外反射光谱测试表明纤维蛋白原在0.3~0.5V(vs.SCE)间发生化学反应,有新的产物生成
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