多路复合电源智能检测系统

介绍了多路复合电源智能检测系统的总体设计思路。主要通过在系统中利用转换电路对输入的电压信号进行同比例降压和反向,使它们能够工作在A/D转换器所允许的电压范围内;经过A/D转换,模拟信号转换成数字信号;通过单片机采集和判断电压信号:若电压欠压或过压,单片机就控制报警系统报警,从而达到智能检测的目的。     

XHD—1微机联用四电极恒电位系统的研制

研制了四电极联机恒电位测试系统并用于研究液-液界面电化学行为1 系统构成和指标 本系统包括内含方波-三角波信号发生器的XHD-I型恒电位仪、APPLEⅠ微机等。信号发生器能产生翻转值及正、负扫速独立可谓的单程或来复扫描,速率1～5500 mV/s分档连续可微调。微调倍率1～11倍。设置了“复初始/起扫”、“保持”和“翻转”三个轻触键及对应的外触发     

应用AD7741实现多路电化学生物传感器信号的隔离A/D采样设计

应用AD7741设计了一款电化学生物传感器的前置电路,给出了多路前置用AD7741进行信号隔离的A/D采样方案,提供了对多路信号进行分时隔离A/D采样的程序控制流程和对A/D采样数据的校正处理方法。     

射频宽带放大器设计与实现

随着微电子技术的发展,小信号的处理在通信和信息处理领域运用越来越广泛,宽带运算放大器广泛应用于A/D转换器、D/A转换器,有源滤波仪、波形发生器、广播、电视、通信、雷达等的接收机等电路中,而对小信号的宽带增益可控和频带内增益起伏控制是当前的一个难题。以两级可控增益放大器AD603为核心,电流反馈型运放THS3091配合,实现了增益可调和频带内增益起伏控制的宽带直流放大器。系统主要由四个模块构成:前置放大电路、可控增益放大电路、后级功率放大电路、频带内增益起伏控制比较电路。     

微弱电流检测系统程控电压源的设计

为满足微弱电流检测系统对直流电压的要求,在分析恒电位仪的结构、原理和控制电压的基础上,设计了一种以高性能的ARM微处理器和12位D/A转换器—MAX532为控制单元的可编程电压源,能够在软件控制下,把预先设定值转换为±5V模拟电压输出。     

基于单片机控制的液面监控仪设计

研究并设计了一种基于单片机的液面监控仪.系统选用FYC-3型浮子式水位传感器,实现对液面信号的检测与采集并输出4～20mA的电流信号;应用12位微功耗采样A/D转换器ADS1286,将模拟的液面信号转变为数字信号提供给单片机处理,实现了信号的收集和处理;系统结构简单、成本低、抗干扰性能好,还具有上、下限报警与控制,手动复位,远程通信等功能.系统解决了以往的液面监控仪中存在的问题,达到了高精度液面测量仪器的各项标准.     

一种程控快速电化学信号采集系统

本文叙述了APPIE—Ⅱ微机与SBC—Ⅰ瞬态波形存贮器及恒电位仪构成的快速电化学信号采集系统的工作原理及其接口方法,并介绍了与其相应的支持软件。用该系统对铜在玻璃碳电极上的电化学成核暂态过程进行研究,取得了较满意的结果。     

水环境重金属检测系统的硬件研究

重金属作为极度危险的污染物质,是判断水质优劣的重要指标。本文研究了水环境重金属传感器的检测原理与内部结构,设计了系统的硬件电路部分,包括恒电位仪电路、电流电压转换电路、放大电路、单片机模块、A/D转换模块、D/A转换模块以及显示部分,经过测试表明硬件电路稳定性良好。对传感器系统进行了Zn离子与Cu离子的标定实验,测定了标定曲线,结果验证了系统的稳定性与可靠性,表明所设计的系统可以满足日常生活中水环境重金属检测工作的要求。     

水环境重金属检测系统的硬件研究

重金属作为极度危险的污染物质,是判断水质优劣的重要指标。本文研究了水环境重金属传感器的检测原理与内部结构,设计了系统的硬件电路部分,包括恒电位仪电路、电流电压转换电路、放大电路、单片机模块、A/D转换模块、D/A转换模块以及显示部分,经过测试表明硬件电路稳定性良好。对传感器系统进行了Zn离子与Cu离子的标定实验,测定了标定曲线,结果验证了系统的稳定性与可靠性,表明所设计的系统可以满足日常生活中水环境重金属检测工作的要求。     

离子液体-有机液体混合体系中制备NiO电致变色薄膜的结构和性能

采用电化学沉积方法在NiCl_2、离子液体和有机液体(DMF)混合体系中制备出结构和性能优异的NiO电致变色薄膜。采用SEM、XRD、紫外-可见分光光度仪、电化学工作站对薄膜的形貌、物相、光学及电化学等方面进行了研究。通过对沉积电位和时间的控制,实现了对薄膜厚度和微结构的控制。结果表明,在室温下,在沉积电位为3.0 V,沉积时间30 s的条件下,所得到的NiO薄膜具有最佳光学性能,其消/着色态透光率差值达到52.7%。在沉积电位3.9 V,沉积时间20 s条件下,薄膜具有最快的响应时间(t_b/t_c=0.32 s/0.30 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.     

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.     

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.     

The Analects and the Moment in Peking——The influence of a Confucian education system on the personality formation,the way of thinking and the fate of the main characters

0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation＇s behavior in their social life throughout the long history is beyond list.