电磁抗垢强化传热技术机理的实验研究

在自行设计建立的电磁抗垢、减垢实验装置上,对冷态工况下低频电磁抗垢、减垢技术机理进行了实验研究。冷态单次通过、循环实验和高倍扫描电镜结果表明,低频电磁能使污垢晶体的结构发生明显变化并有抑制污垢晶体尺寸长大的作用。     

88Ni-Fe合金超细微粒的制备、磁性以及热分析

气相蒸发法制备的88at%Ni-Fe合金超细微粒,平均垃径为5一84nm,观察、分析了样品的形貌、结构、成分、磁性、表面吸附以及氧化等,结果表明,做粒晶体结构呈面心立方,晶格常数及成分均接近于块材,表面吸附一层氮气分子,微粒单畴临界尺寸约为37nm,由此算出有效各向异性常数为6.16×10~5erg·cm~(-3),远大于块材,发现样品的居里温度呈现一定分布,并与微粒的尺寸分布及其表面(界面)层有关.     

超声波提取、ICP-AES法测定烟草中矿物元素

本文研究了超声波提取烟叶中的部分矿物元素，浸提液用ICP-AES法测定，其中K、Ca、Mg、B、Zn获得了较满意的结果，P、Mn的测定结果稍偏低。此方法快速安全、试剂用量少、污染少、操作简便，适合烟草样品中上述元素的快速检测。与硝酸-高氯酸湿消化法对照，结果吻合。并测定了国家烟草标准GBW 08514T GBW 08515，其结果与标准值相符。     

废旧镍镉电池真空蒸馏规律的研究

在实验室条件下，对镍镉电池的真空蒸馏基本规律进行了探索.分析了温度、压力和时间等工艺因素对镍镉分离效果的影响，并对镍镉电池的真空蒸馏机理进行了研究，为废旧镍镉电池资源化提供了理论依据和实验数据.     

Wide-ranging Force Responsive Composites based on 1,2-Dioxetane and ZnS as Luminescent Probes in Polyurethanes

Combining the advantages of mechanochemiluminescence from 1,2-dioxetane and elastico-mechanoluminescence from Zn S particles, a new kind of mechanoluminescent polymer composites are developed. They can emit bright luminescence with two distinct colors at different strains, empowering a verstaile mechanochemical strategy for force sensing and damage detection at a wider force responsive range.     

Iolite Based Bulk Normalization as 100% (m/m) Quantification Strategy for Reduction of Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry Transient Signal

Iolite package draw more attention in laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) community in recent years due to its powerful data-handling capacity, excellent signal visualization and open source of calculation codes. In this study, the application of Iolite package was investigated for LA-ICP-MS elemental quantification, and a calculation code for the bulk normalization as 100% (m/m) strategy was compiled. We found that the spline interpolation approach was better than that of linear one for the correction of time-dependent instrument drift. BCR-2G as the quality material was used to assess the proposed code, and the results revealed that the code was practical and reliable. The analytical accuracy was influenced by the used calibration materials. TiO₂, MgO, K₂O and rare earth elements in BCR-2G were slightly off (5%–10%) when NIST SRM 610 as the calibrator. Cr and Mo were higher (10%–30%) than the recommended values when StHs6/80-G was used as the calibrator. The phenomena would be attributed to the matrix effect or the inaccurate values of corresponding calibrators. Three main sources for the LA-ICP-MS combined uncertainty were recognized, including the uncertainty of recommended values of analytes in calibration material, the uncertainty of measured intensity ratios in sample and the error in bulk normalization as 100% (m/m) strategy. A total of 50 elements in CGSG glass reference materials were quantified based on the proposed Iolite code. Major elements (except MnO, CaO and P₂O₅) matched well with the recommended values with a discrepancy of 5%, and the trace elements (except Cr, Ni, Zn, Ga, Mo and Sb) were agreement with the recommended values in 10%. The dataset reported in this study was helpful for the value certification of CGSG reference materials. Overall, the proposed Iolite code broadened the application of Iolite package in the reduction of LA-ICP-MS transient signal for the elemental determination.     

多酸Eu-PMo12O40可逆变色/荧光开关性质对维生素C的光谱检测

将VC等量加入Eu-PMo_(12)O_(40)溶液中,PMo_(12)O_(40)_3-被还原由浅黄色变为蓝色,同时Eu~(3+)的荧光淬灭。利用UV-Vis、PL光谱法分别测定不同VC浓度下Eu-PMo_(12)O_(40)的紫外可见光谱、荧光光谱,以700 nm处的吸光度对VC浓度作图,得到VC的线性检测范围为0~0.40 mmol·L~(-1)、检出限为0.025 8μmol·L~(-1);以591 nm处的荧光强度对VC浓度作图,获得VC的线性检测范围为0~0.64 mmol·L~(-1)、检出限为0.036 1μmol·L~(-1)。最后,在VC还原和H_2O_2氧化下,研究了Eu-PMo_(12)O_(40)变色/荧光开关性质的可逆性以及对VC检测的可重复使用性。     

BEPCⅡ注入冲击磁铁电源系统的时间漂移调节器

北京正负电子对撞机二期改造工程(BEPCⅡ)对注入冲击磁铁电源系统的时间稳定性提出了很高的要求,即脉冲的时间抖动和漂移总量小于±5ns.BEPCⅡ冲击磁铁电源采用的是基于闸流管开关的LC谐振放电的半正弦脉冲电源,为了补偿包括闸流管在内的系统时间漂移,研制了时间漂移调节器,经过测试其主要性能指标达到设计要求,调节分辨率为1ns,自身抖动加8小时漂移小于2n5.主要介绍时间漂移调节器的基本原理和实现手段,以及研制过程所获得的主要经验.     

A new insertion sequence for incremental Delaunay triangulation

Incremental algorithm is one of the most popular procedures for constructing Delaunay triangulations (DTs). However, the point insertion sequence has a great impact on the amount of work needed for the construction of DTs. It affects the time for both point location and structure update, and hence the overall computational time of the triangulation algorithm. In this paper, a simple deterministic insertion sequence is proposed based on the breadth-first-search on a Kd-tree with some minor modifications for better per- formance. Using parent nodes as search-hints, the proposed insertion sequence proves to be faster and more stable than the Hilbert curve order and biased randomized insertion order (BRIO), especially for non-uniform point distributions over a wide range of benchmark examples.     

侧链型磺化聚芳醚酮质子交换膜材料的制备

本文通过对聚合物的结构设计, 采用均聚的途径将柔顺的大侧基(甲氧基苯基)引入聚芳醚酮侧链, 然后通过室温后磺化的方法成功制备出侧链型磺化聚芳醚酮材料. 此类材料表现出较好的热稳定性; 力学性能优异; 聚合物的质子传导率比报道过的类似材料有较大程度的提高; 于80 ℃时的质子传导率在0.190 S/cm以上, 超过了Nafion 117 薄膜的传导率(0.175 S/cm). 因此这类材料有望在质子交换膜领域得到应用.