Charge-discharge process of MnO2 supercapacitor

Mechanochemical synthesis of α-MnO2 was carried out with KMnO4 and Mn（CH3COO）2 in 1：1 mole ratio. The electrochemical performance of MnO2 electrode was investigated by cyclic voltammograms and alternating current impedance. The charge-discharge process of MnO2 supercapacitor in 6 mol/L KOH was studied within 1.2 V at 200 mA/g, suggesting that it displays double-layer capacibility in low potential scope and pseudo-capacitance properties in high potential scope. It is found that Mn3O4, an electrochemical inert, mainly forms in the initial 40 charge-discharge cycles. During cycling, the pseudo-capacitance properties disappear and the discharge curves are close to ideal ones, indicating double-layer capability. The maximum capacitance of MnO2 electrode is as high as 416 F/g, and retains 240 F/g after 200 cycles. The equivalent series resistance increases from 17 to 41Ω.     

Performance of positive and negative electrodes in amorphous manganese oxide supercapacitor

Using potassium permanganate and acetic manganese as the reactants, amorphous manganese oxide was prepared with mechanochemical method. XRD was used for microstructure characterization, while cyclic voltammetry and constant current charge-discharge were used for electrochemical performance testing. The positive electrode （PE） and negative electrode （NE） were investigated respectively in amorphous manganese oxide supercapacitor, aiming to find their different performances in charging-discharging. The results show that the crystalline structure is destroyed in both the PE and NE material during charge-discharge process. Thereinto, the NE suffers a bit more seriously. When cycling, the PE potential scope diminishes while the NE potential scope enlarges. The increased inner resistance makes the NE curves almost bended to be a right angle, but not the PE curves. The cell＇s equivalent series resistance （ESR） is more dependent on the NE, and the capacitance is mainly determined by the rapid descent of the NE potential range. The capacitances of the NE are highly rate-dependent, decreasing from 121.3 to 53.1 F/g, by 56.2%, over the range of 5-25 mV/s. However, the PE appears to be weakly dependent and its capacitance is only dropped by 22.1%.     

露天采场降低大块率和根底产出率的措施

英德建国矿业工程有限公司矿区中深孔台阶爆破存在着大块率和根底产出率偏高等问题。为此,公司爆破小组针对生产中出现的该问题进行了原因分析,对爆破理论进行深入的理解,以此对布孔参数做更进一步的优化;采用适当延迟时间逐孔起爆、改变原有装药模式并在整个采石作业流程中采取严格施工、科学管理等措施,并由最终的数据统计综合研究中证明本研究所采取的措施有效。     

肌钙蛋白I(cTnI)定量检测诊断AMI的评价

目的评价肌钙蛋白I(cTnI)定性检测对诊断急性心肌梗死(AMI)的应用价值。方法对162例入院诊断急性心梗患者,分别作肌钙蛋白I定量检测以及冠状动脉造影,计算cTnI检测诊断心肌梗死的灵敏度和特异性,组间差异采用χ2检验。结果cTnI定量检测的灵敏度为91.3%,特异性为100%,诊断AMI2组有显著差异性。结论cTnI定量检测临床诊断AMI不能取代冠脉造影。cTnI诊断AMI具有高灵敏度,高特异性的特点,是临床诊断AMI有效指标。     

压水堆辐照监督管中子注量计算方法改进研究

总结分析了目前压水堆辐照监督管中子注量的工程计算方法和流程。通过理论研究和敏感性分析,提出了部分改进的计算方法。根据实际核电厂辐照监督管快中子注量计算结果与实测值的比较,证明了本文提出的改进方法的合理性和先进性。     

百色盆地那坤油田构造精细解释与储层预测

针对百色盆地那坤油田复杂地表条件，地震反射资料信噪比较低和地质构造复杂的特点，开展了三维地震资料目标处理来提高地震资料的品质，在此基础上采用多种地震技术进行构造精细解释和储层预测等方面的工作。研究成果表明：该区地震资料品质有明显改善，构造格局得到进一步落实，并在储层预测方面也取得了新的认识。运用该成果在坤12块东部布署探井获得工业油流，为那坤油田的滚动勘探开发提供较好的基础。     

基于保偏光纤和LPFG的Sagnac环温度及环境折射率双参量光纤传感器研究

报导了一种基于级联保偏光纤(PMF)和长周期 光纤光栅(LPFG)的Sagnac环温度和环境折射率双参 量传感器。在Sagnac干涉环内级联PMF和LPFG,LPFG的双折射效应使得Sagnac干涉的相位差 受环境折射率调 制。所提出的双参量传感器的透射光谱中,由LPFG形成的透射峰和Sagnac干涉形成的干涉峰 对温度和环境折射 率各自具有不同的灵敏度,通过对两者特征峰波长漂移量的测量就可实现对温度和环境折射 率的同时传感。实验上 搭建了温度和环境折射率双参量测试装置,采用波长解调方法,受光源功率波动的影响小, 温度灵敏度为1.2nm/℃; 环境折射率灵敏度为15nm/RIU。该双参量传感方案解决了温度和环 境折射率的交叉敏感问题,结构简单,采用金 属板凹槽结构进行封装有效地保护了LPFG,在生物传感和化学传感等领域具有广阔的应用前 景。     

弱结晶α-MnO2超级电容器电极EIS分析

通过机械球磨法制备得弱结晶α-MnO2,并组装成对称型超级电容器进行充放电测试,对充放电若干次后的电极进行电化学阻谱测试。结果表明,电极过程先表现为半无限扩散阻抗特征,然后逐渐表现为有限层扩散阻抗,最后为阻挡层扩散阻抗;电极微分电容从2.40×10-1F减少到1.91×10-3F;交换电流密度先减少到69.8mA/g,经过325次循环后再大幅增加到534mA/g;电极反应电阻先增加到24Ω后减小到5.2Ω,而接触电阻则从0.89Ω增加到1.9Ω。     

露天采场降低大块率和根底产出率的措施

英德建国矿业工程有限公司矿区中深孔台阶爆破存在着大块率和根底产出率偏高等问题。为此,公司爆破小组针对生产中出现的该问题进行了原因分析,对爆破理论进行深入的理解,以此对布孔参数做更进一步的优化;采用适当延迟时间逐孔起爆、改变原有装药模式并在整个采石作业流程中采取严格施工、科学管理等措施,并由最终的数据统计综合研究中证明本研究所采取的措施有效。     

Application of thermal electrochemical equation to metal-hydride half-cell system

1 INTRODUCTIONNickel-metal hydride ( Ni/ MH) battery be-came the principal power of electronic vehicle be-cause of its excellent characteristics such as highenergy density , high power , no memory effect ,long service life and wide temperature perform-ance . The hydrogen storage alloy is the key mate-rial of Ni/ MH dynamical battery , a mass of re-search work such as the technique of preparation,the performance of thermodynamics , kinetics andelectrochemistry were accomplished in recenty…