火灾演化过程与“四个能力”建设

分析火灾成灾演化过程及原因,阐述火灾成灾演化与"四个能力"建设的关系,提出增加预警能力建设、实行注册消防管理人制度、调整消防监督检查的重点、改变"逢火必罚"的观念与做法等建议。     

Concrete filled double skin circular stub columns under compression

Concrete filled double skin tubular (CFDST in abbreviation) stub columns consist of double concentric thin steel tubes and filled concrete between them. Their mechanical behaviors under axial compression were investigated experimentally. Two testing parameters considered were inner-to-outer diameters ratio and diameter-to-thickness ratio. Observed failure modes were controlled by the local buckling of both the tubes associated with shearing failure of the filled concrete. Main discussion is given on confinement effect by the outer tube to the filled concrete strength. Equations to estimate their ultimate strengths under compression were proposed based upon the yielding strengths of the tubes and the filled concrete cylinder strength.     

储能用水系钠离子电池电极材料研究进展

在全球能源日益加剧的背景下,开发与利用风能、太阳能、潮汐能等可再生能源成为当务之急。伴随绿色能源的迅猛发展,电化学储能技术中的二次电池,因其在储能领域中具有调节绿色能源电力输出的平稳性和稳定性而备受关注。其中,水系钠离子电池因具有资源丰富、高安全性、高离子电导率及制备工艺简便等优点,正逐渐成为未来储能系统中的重点研究方向。尽管水系钠离子电池的潜在优势显著,但其在实际运用中仍面临着诸多挑战（如循环稳定性不佳、可供选择的电极材料体系比较有限及电池容量较低等）,这主要是因电极材料在水溶液中的电化学窗口过窄和化学稳定性不足,限制了电池的使用寿命,从而阻碍了其大规模应用。因此,优化现有电极材料及开发新型材料,成为提升水系钠离子电池性能的关键。简要概述了水系钠离子电池系统的特点,并对其正、负极材料的最新研究进展进行了详细的阐述,如材料的合成方法、结构设计、电化学性能及应用前景。同时,对水系钠离子电池的未来发展方向进行了展望。本研究旨在为新型电极材料的研发及水系钠离子电池技术的加快发展提供理论依据。     

煤泥水浓缩系统技术改造

霍州煤电集团辛置洗煤厂,于2002年经过重介技术改造,各项指标均达到规定要求,但随着重介生产能力的逐渐提高,煤泥水系统、澄清工艺已无法满足重介分选时要求的清水作业.因此,经过分析工艺要求和生产现状,提出改造方案,改进了煤泥水系统工艺流程.改造后,满足了重介分选清水作业的要求,入洗能力显著提高.     

Preparation of succinylated derivatives of psyllium and their physicochemical and bile acid-binding properties

The succinyl psyllium derivatives were successfully prepared by reacting psyllium with succinic anhydride, 4-dimethylaminopyridine and tributylamine in N,N-dimethylformamide. Three succinyl psyllium derivatives with different degrees of substitution were prepared and denoted as S-Psy-L, S-Psy-M and S-Psy-H. FT-IR spectrum and ¹H NMR of the succinylated psyllium showed that its monoester derivative, with succinyl groups, was formed successfully. The succinyl derivatives were also evaluated for their surface structure, gelling properties, water uptake capacities, swelling volumes, and bile acid-binding abilities in vitro. The results showed that succinylation significantly reduced the gelling properties and swelling ability of psyllium, as well as increased water uptake abilities and bile-acid binding capacities. The results of this study suggested that succinylation could be a potential approach for obtaining novel derivatives of psyllium with improved physicochemical and biological properties for application in functional foods or other consumer products.     

Electrochemical hydrogen storage of ball-milled MmMg12 alloy–Ni composites

MmMg₁₂–Ni amorphous or nanocrystalline composites (Mm: Ce-rich mischmetal) were prepared through the ball-milling method, and their electrochemical hydrogen storage performance was investigated and compared with that of ball-milled CeMg₁₂–Ni composites. It was found that the ball-milled MmMg₁₂–Ni composites had larger initial discharge capacities and better high rate dischargeability. Analysis of electrochemical impedance spectra (EIS) shows that the reaction resistance and hydrogen diffusion resistance of the ball-milled MmMg₁₂–Ni composites are lower as a result of the decrease in Ce content, and thus can contribute to the larger discharge capacity and better high rate dischargeability. Additionally, the cycle performance of the ball-milled MmMg₁₂–Ni composites is better than those of the ball-milled CeMg₁₂–Ni composites. This may be related to the formation of a Nd oxide or Nd(OH)₃ film on surface of the MmMg₁₂ alloys.     

稻麦轮作条件下施用氮肥对土壤供氮能力的影响

应用淹水密闭培养法评价了不同施肥处理对土壤供氮能力的影响。研究发现经过6年的轮作施肥,增施氮肥能够提高土壤的供氮能力及可矿化氮在土壤全氮中的比例。在淹水培养中,高施肥量土壤的氮矿化过程符合对数函数方程,而低施肥量和不施肥土壤符合直线方程。酸解氮和热氯化钾提取氮与土壤可矿化氮的相关性好于全氮、有机质和碱解氮,是良好的土壤供氮能力指标。     

TDD-CDMA上行系统多业务接入容量

通过分析时分双工 码分多址（TDD－CDMA）系统中业务接入容量与干扰之间的关系以及TDD－CDMA干扰分布的特殊性,使用Delbrouck算法,对TDD－CDMA上行系统进行了多业务接入容量研究,可以求得多维损失制系统的呼叫阻塞率、流量阻塞率、时间阻塞率及承载流量. 最后给出了数值和仿真分析结果,证明了该方法的有效性.     

6 种东北地区红树莓果渣提取物的抗氧化活性差异

以东北地区6 种红树莓果实加工后的果渣提取物为实验材料,研究其总酚、总黄酮、原花青素、花色苷含量和体外抗氧化活性的差异。结果表明：宝石红果渣提取物中总酚、总黄酮和原花青素含量最高,分别为14.18、3.71、15.28 mg/g;哈瑞太兹果渣提取物中花色苷含量最高,为0.68 mg/g;菲尔杜德和野生果果渣提取物的总还原能力与VC接近;除哈瑞太兹外,其他品种红树莓果渣提取物对（1,1-二苯基-2-三硝基苯肼（1,1-diphenyl-2-picrylhydrazyl,DPPH）自由基和2,2’-二氮-双（3-乙基苯并噻唑-6-磺酸）二铵盐自由基（2,2’-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) radical,ABTS+·）的清除率均大于VC。相关性分析结果表明红树莓果渣提取物的总还原能力与总黄酮、原花青素含量的相关性较大;对DPPH自由基的清除率与原花青素、花色苷含量的相关性较大;而对ABTS＋·的清除率与总酚和总黄酮含量的相关性较大。在6 个红树莓品种中,菲尔杜德和野生果果渣提取物具有较强的抗氧化活性。     

变电站用阀控式铅酸蓄电池容量监测方法

在变电站的直流系统中,蓄电池组作为备用电源,作用十分重要。阀控式铅酸蓄电池组其本身的离散性可导致单体电池的早期失效,运行环境亦将影响电池的使用寿命。蓄电池维护的主要工作,是找出并处理落后电池以预防事故隐患。由于现有的核对性放电试验和容量试验的准确性效率不高,介绍了一套蓄电池放电容量测试装置(IDCE-2205C)以提高蓄电池的维护效率。