对硫磷在聚番红花红修饰玻碳电极的电化学行为研究

构建了一种以电聚合番红花红膜修饰的对硫磷电化学传感器,利用循环伏安和线性扫描伏安技术对对硫磷在聚番红花红膜修饰玻碳电极上的电化学行为进行了研究,实验发现聚番红花红膜修饰玻碳电极对对硫磷的还原有更好的电催化性能。对硫磷浓度在3.43×10-8～3.43×10-5 mol/L范围内与其峰电流呈现良好的线性关系,检出限为1.0×10-8 mol/L.该传感器具有制备简单、灵敏度高、响应速度快、稳定性和重现性好等特点。     

基于多壁碳纳米管修饰的葡萄糖生物传感器

用循环伏安法在玻碳电极表面电沉积了一层稳定的甲苯胺蓝聚合物膜,以此作为电子传递介体,结合多壁碳纳米管、壳聚糖(CHIT)、葡萄糖氧化酶(GOD)混合包埋制备出一种新型葡萄糖生物传感器.实验结果显示,用此法制备的传感器对葡萄糖的线性响应范围为5.0×10-6~2.0×10-2mol/L,线性相关系数为0.9969,检测限为1×10-6,响应时间为3.2 s,并具有抗尿酸、抗坏血酸等干扰的特点.     

氧化石墨烯-硫堇及纳米金修饰玻碳电极电流型葡萄糖生物传感器的研究

以玻碳电极为基底,在电极表面修饰一层氧化石墨烯-硫堇(GO -Th)薄膜,通过层层自组装方式,将纳米金和葡萄糖氧化酶(GOD)固定在玻碳电极表面,制得一种新型电流型葡萄糖生物传感器.在优化的实验条件下,该生物传感器对葡萄糖的线性响应范围为1.0×10-9 ～5.7×10-5 mol·L-1,检测下限为5.0×10-10...     

基于铜-石墨烯纳米复合膜修饰电极的无酶葡萄糖传感器

采用电沉积的方法在石墨烯表面修饰一层铜膜,对铜/石墨烯纳米复合膜进行了表征.研究显示铜/石墨烯纳米复合膜修饰电极对葡萄糖有较好的电催化活性,并且在8×10-6～9.4×10-4mol/L范围内呈线性关系,检测限为2.5μmol/L(S/N=3),灵敏度为0.225 A.L.mol-1.实验表明该修饰电极对葡萄糖有较好的选择性.     

基于纳米硫化镉作为新的固酶基质的过氧化氢生物传感器的研究

以玻碳电极为基底,电聚合一层负电性的刚果红膜（PCR）,再通过静电吸附作用自组装硫堇（TH）和纳米硫化镉（nano—CdS）。最后,将辣根过氧化物酶（HRP）固定在纳米硫化镉／硫堇／聚刚果红修饰的玻碳电极表面,制备出一种性能良好的过氧化氢生物传感器。通过循环伏安法和计时电流法考察电极的电化学特性,探讨了工作电位,pH对电极响应的影响。用计时电流法测得电极线性范围为1．85×10^-6～9．67×10^-3mol／L,检出限为6．5×10^-7mol／L。实验结果表明,该方法提高了过氧化物酶的固载量,增强了传感器的灵敏度和稳定性,且具有制备方法简单、灵敏度高、选择性好等特点。     

Nafion膜固定血红蛋白和银纳米粒子构筑NO_2~-生物传感器

利用Nafion膜将血红蛋白(Hb)和银纳米粒子(AgNPs)固载到玻碳电极表面制作N O-2生物传感器.循环伏安实验表明:Hb/AgNPs/Nafion膜电极在pH值为6.9的PBS缓冲溶液中呈现出一对明显的HbFe(Ⅲ)/(Ⅱ)氧化还原峰,该电极对N O2-有良好的催化作用,线性范围为2.0×10-5~3.4×10-4 mol/L(n=18,R=0.997),检测限为1.2×1 0-6 mol/L(信噪比为3);故该膜电极可做N O-2生物传感器.     

萘酚绿为电子媒介体金纳米颗粒修饰的葡萄糖生物传感器

报道了一种制作新型电流型葡萄糖传感器的方法 .用金纳米颗粒吸附葡萄糖氧化酶 ,采用聚乙烯醇缩丁醛(PVB)为辅助固酶膜基质将其固定在铂金电极的表面 .在待测的葡萄糖溶液中加入萘酚绿作为电子媒介体 ,制成葡萄糖生物传感器 .酶吸附在纳米金表面上稳定且仍能保持其生物活性 ;而电子媒介体的存在 ,显著提高了传感器的响应灵敏度 .线形范围在 5 0× 10 -5～ 5 0× 10 -2 mol/L ,检测下限为 2 5× 10 -5mol/L(信噪比为 3) .用该生物传感器测定了人体血清中的葡萄糖 .尿酸、抗坏血酸等对测定无干扰 .     

基于电沉积石墨烯/普鲁士蓝/壳聚糖复合薄膜的葡萄糖生物传感器（英文）

在玻碳电极表面通过三步电沉积法制备了石墨烯/普鲁士蓝/壳聚糖复合薄膜葡萄糖生物传感器.通过循环伏安法将氧化石墨烯电化学还原,在电极表面直接得到石墨烯纳米层,在石墨烯纳米层上成功电沉积得到普鲁士蓝纳米粒子和葡萄糖氧化酶-壳聚糖复合薄膜,制备的修饰电极通过电化学方法以及扫描电镜分析了其性能与结构.在最优条件下,该生物传感器表现出了灵敏度高(50.29 mA·L·mol~(-1)·cm~(-2))、检测限低(12μmol·L~(-1))、响应时间短(3 s)等特点.电极响应电流与葡萄糖溶液浓度在0.02～10 mmol·L~(-1)范围内具有较好的线性关系.此外,在对人体血清样本的检测中,该传感器同样表现出优异的性能,对血清中常见物质具有较强的抗干扰能力.     

基于纳米金增稳、增敏的过氧化氢生物传感器研制

将辣根过氧化物酶(HRP)、纳米金、壳聚糖和戊二醛按照一定比例混合均匀,并吸取微量体积滴于玻碳电极表面,4 ℃下放置12 h,于是在玻碳电极表面形成一层稳定固载HRP的壳聚糖膜.由于纳米金能与HRP形成静电复合物,因而有效地防止HRP从壳聚糖膜中泄漏和提供适应酶所需的微环境,高效地保持HRP的生物活性.用对苯二酚作为电子媒介,用计时安培法优化了生物传感器操作参数.此生物传感器测定H2O2的线性范围为3.7×10-6至 1.22×10-3 mol/L,灵敏度为0.31 A L mol-1·cm-2,检测限为3.7 mmol/L,响应时间小于6 s,酶电极的表观米氏常数( Km app)为0.064 mmol/L.实验证明纳米金具有增加固定HRP生物活性、显著延长生物传感器使用寿命及提高测定H2O2的灵敏度等功能.     

磁性纳米Fe_3O_4颗粒掺杂多壁碳纳米管修饰的葡萄糖生物传感器

磁性纳米Fe3O4颗粒掺杂多壁纳米碳管混合分散于壳聚糖中,得到壳聚糖胶质液.将其修饰到玻碳电极表面,通过交联剂戊二醛固定葡萄糖氧化酶,制得一种新型的传感器.该传感器在pH＝6.8的磷酸盐缓冲溶液中.对葡萄糖的线性响应范围为1.0×10-5～2.3×10-2 mol/L,响应时问5.3 s.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with