过氧化氢的伏安行为研究

本文分别对玻碳电极及铂微电极上过氧化氢的伏安行为进行了研究。结果表明，在玻碳电极上，过氧化氢在１．０Ｖ（ｖｓＳＣＥ）左右产生一个不可逆的氧化峰，并在电极上有吸附作用，在铂微电极上，过氧化氢于０．６Ｖ（ｖｓＳＣＥ）附近产生可逆的氧化还原峰。两种电极均可用于过氧化氢的测定，并间接用于葡萄糖的测定，取得了满意的结果。     

适用于测量沉积物pH的金属氧化物微电极

用改进的高温熔融碳酸盐法制备了铱和钨氧化物pH微电极,表征了金属氧化物电极的各项性能.所制备电极对pH有较好的线性响应,斜率在40～60 mV/pH ,接近理想能斯特响应.实验表明,铱氧化物微电极在长时间工作稳定性方面优于钨氧化物微电极,90%响应时间为5 s.铱氧化物微电极受盐度和氧气浓度影响很小,且经Nafion修饰后不受沉积物间隙水中还原性S2-的影响.把铱氧化物微电极应用于测量厦门西海域和九龙江河口的沉积物pH垂直剖面,发现pH在沉积物有氧和无氧深度界面(4～5 mm)达到最小,20 mm以深趋于稳定,符合沉积物生物地球化学规律.     

碳纳米管气敏传感器微电极的制备与检测

基于参数优化设计了一种电场分布合理的叉指微电极结构,利用光刻技术在ITO表面成功制备了最小指间距约为4μm的叉指微电极,为微电极制备提供了一种可靠、低成本的制备方法。将这种微电极用于碳纳米管气敏传感器中,并利用氨气对其气敏特性进行测试,结果表明,纳米材料修饰的微电极气敏传感性能得到了明显提高。     

聚酰亚胺基柔性神经微电极的优化

对一种聚酰亚胺基柔性神经微电极进行了结构及制作工艺等方面的优化.针对动物视网膜的刺激,设计制作了具有固定通孔结构的柔性神经微电极.在制作工艺方面,使用空气等离子体表面处理以增强金属层的黏附性,降低了微电极的界面阻抗,增强了微电极稳定性,使之适于长期植入.优化后微电极的电极金属层牢固且具有较低的界面阻抗(43 kΩ),比处理前降低了25.4%,误差减小了约4/5,具有良好的实用性.     

植入式硅神经微电极的发展

 神经科学和神经工程研究需要研究大脑神经元的电活动情况，以了解大脑产生、传输和处理信息的机制。植入式神经微电极作为一种传感器件，是时间分辨率最高的神经电活动传感手段之一。介绍了国内外几种主要的植入式硅基神经微电极的结构特点、制备方法和性能特点。分析表明，未来通过不断结构优化和改性修饰，特别是在高通量的神经记录方面，通过与同样基于硅材料的电路的集成，硅神经微电极能够进一步提高生物相容性，解决大规模的电极通道体内外传输与连接问题，实现对神经元的在体大规模长时间记录。     

毛细管微电极制备参数优化

采用电解氯化法制备Ag/AgCl参比电极,结合铂丝辅助电极及毛细玻璃管制作微区电化学测试用毛细管微电极,借助电化学测试及微观形貌分析研究了不同电解工艺参数及毛细管管口口径对微电极性能的影响。结果表明,随着电解极化电流密度、极化时间、电解液浓度的增加,所制备的Ag/AgCl参比电极稳定性先增加后降低,在浓度为0.25mol/L的HCl溶液中以3.2mA/cm~2的极化电流密度极化30min时,所制Ag/AgCl参比电极稳定性最佳;将微电极的毛细管管口口径控制在50～110μm时,可保证较高的微区电化学测试成功率。     

碳纳米管粉末微电极对儿茶酚的电催化还原

采用粉末微电极来研究修饰和未修饰的碳纳米管电极的电化学特性,结果显示经阳极极化的碳纳米管比未极化的碳纳米管具有明显的催化效果,处理后的碳纳米管修饰的粉末微电极邻苯二酚具有较高的催化活性．     

多巴胺在过氧化聚吡咯膜修饰碳纤维微柱电极上的伏安行为(英文)

用电化学方法制备了过氧化聚吡咯膜修饰碳纤维微柱电极,并对其电化学行为进行了研究.结果表明,在中性和酸性缓冲溶液中,过氧化聚吡咯膜修饰微电极能有效地排除抗坏血酸的干扰而选择性地对多巴胺产生响应.     

聚苯胺—碳复合电极材料研究

采用吸附聚合法制备聚苯胺－碳复合粉料，用涂覆法制备大面积、可卷绕的聚苯胺－碳－聚偏氟乙烯复合阴极膜作为锂二次电池的阴极活性材料。研究了试验电池的工艺特点和放电特性。     

电极类型对NiOOH循环伏安测试的影响

 制备了NiOOH的涂膏式电极和粉末微电极,并对两种电极进行了循环伏安测试.测试结果表明,粉末微电极出现了还原峰和氧化峰,而涂膏式电极只出现了还原峰,表明粉末微电极的电极可逆性优于涂膏式电极;对于粉末微电极,其氧化峰及还原峰的峰电位、峰电流最终均趋于稳定,说明所制备NiOOH较为稳定;而其ΔE值最小仅为0.131 V,小于涂膏式电极所测值,说明粉末微电极用于循环伏安测试效果更好,所制备NiOOH样品晶格结构较为稳定,具有较好的电极可逆性.对造成涂膏式电极和粉末微电极测试结果差异的原因进行了分析探讨.     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.