硫化矿床开采特高温炮孔的装药爆破安全技术

本文阐述了高温矿床火区开采特高温炮孔的装药爆破安全技术。提出了掌握炸药安全使用温度,采取隔离、隔热包装,降低孔温及提高临界温度等安全措施。     

Intelligent healthcare service based on context inference using smart device

In the field of “U-Healthcare Service”, many studies have been actively conducted to develop “smart device”-based healthcare applications that enable healthcare providers and patients to be better served through interoperations among various kinds of sensors and wireless network interfaces. In particular, contemporary intelligent healthcare services not only recognize users’ context information through smart devices, computers, and so forth, but also acquire information from heterogeneous sensors to achieve context-aware inference services. Among such information, the weather information is tightly related to diseases such as asthma and allergies. Therefore, there is a high demand for research to utilize the weather information for healthcare services. In this paper, we propose a context inference-based intelligent healthcare service that exploits both the weather conditions information and the diverse healthcare ontologies available on the Internet. The proposed service aims at modeling a context ontology in users’ healthcare service environment and defining the inference rules, thereby accomplishing a satisfactory real-time healthcare service.     

刍议全寿命周期成本在配电网规划中的实践

目前,市场经济体制的确立和完善促使供电企业之间的竞争日趋激烈。在配电网规划中应用全寿命周期成本,可以提升企业的经济效益和综合竞争力,推动其更好、更快地发展。通过简要分析全寿命周期成本在配电网规划中的实践,提出了一些有价值的参考意见。     

不同形貌ZnO气敏材料的制备及影响气敏性因素分析

以锌盐和碱为原料,采用水热和溶剂热法合成了三种形貌的氧化锌粉体,利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和X射线光电子能谱仪(XPS)对产物的结构和形貌及表面化学状态进行了表征,并将粉体制备成厚膜型气敏元件,测试了其对几种还原性气体的气敏性能,结果表明:在工作温度为395℃时,三种形貌氧化锌对相同浓度的同种测试气体的灵敏度大小顺序为:菜花状氧化锌﹥棒状氧化锌﹥六棱柱状氧化锌。并对影响氧化锌材料气敏性的各种因素进行了分析。     

软锰矿浸出制备软磁铁氧体用碳酸锰的研究

研究了以低品位软锰矿石为原料,配入植物粉料,用硫酸直接浸出软锰矿制备软磁铁氧体用碳酸锰的新工艺方法。探讨了软锰矿直接酸浸、含锰浸出液净化除杂、锰净化液碳化结晶等工艺条件。所制备的产品经X 射线衍射、粒度分析及化学成分分析等测试,结果表明,产品质量达到GB10503 89Ⅰ型品的要求。在优惠工艺条件下,锰的回收率达90%以上。     

闭世界框架下灰色模糊多属性决策方法

针对D-S 证据理论在融合高度冲突的证据时可能导致与直观结果相悖的问题, 已有的基于修改数据模型的方法更多地考虑如何提高冲突证据结果的聚焦程度, 而没有考虑冲突成因以及如何通过冲突原因判断来削减证据之间的冲突. 对此, 提出一种闭世界框架下的灰色模糊多属性决策方法. 根据一般的灰色关联分析方法的基本思路, 将灰色关联度与欧氏距离有机结合, 构造出一种平均相似度对方案进行评价, 进而得到方案的排序结果. 最后, 通过实例分析验证了所提出方法的可行性和有效性.     

A porous mixed-valent iron MOF exhibiting the acs net: Synthesis, characterization and sorption behavior of Fe3O(F4BDC)3(H2O)3·(DMF)3.5

A new mixed-valent iron MOF, formulated as Fe₃O(F₄BDC)₃(H₂O)₃·(DMF)_3.5 (1), has been synthesized by using a perfluorinated linear dicarboxylate to link trigonal prismatic Fe₃(μ³-O)(O₂C–)₆ clusters. The structure refinement based on single crystal X-ray diffraction data collected from 1 reveals the material exhibits the acs topology with large channels along the crystallographic c-axis. Due to the presence of fluorine atoms the organic link, 2,3,5,6-tetrafluorobenzene-1,4-dicarboxylate (F₄BDC), has a 63° torsion angle between the carboxylate and aromatic planes, resulting in larger channels compared to those in the isoreticular material MOF-235. While few iron-based MOFs have demonstrated porosity, nitrogen and hydrogen sorption experiments carried out at 77 K proved the porosity of outgassed 1, which has a Langmuir surface are of 635 m²/g and a gravimetric capacity of 0.9 wt% of hydrogen at 1 bar.     

Analysis of saturated free fatty acids from pollen by HPLC with fluorescence detection

A sensitive method for the determination of free fatty acids using 2‐(2‐(anthracen‐10‐yl)‐1H‐naphtho[2,3‐d]imidazol‐1‐yl) ethyl‐p‐toluenesulfonate (ANITS) as tagging reagent with fluorescence detection has been developed. ANITS could easily and quickly label fatty acids in the presence of the K₂CO₃ catalyst at 90 °C for 40 min in N,N‐dimethylformamide solvent. From the extracts of rape bee pollen samples, 20 free fatty acids were sensitively determined. Fatty acid derivatives were separated on a reversed‐phase Eclipse XDB‐C₈ column by HPLC in conjunction with gradient elution. The corresponding derivatives were identified by post‐column APCI/MS in positive‐ion detection mode. ANITS‐fatty acid derivatives gave an intense molecular ion peak at m/z [M+H]⁺; with MS/MS analysis, the collision‐induced dissociation spectra of m/z [M+H]⁺ produced the specific fragment ions at m/z [M–345]⁺ and m/z 345.0 (here, m/z 345 is the core structural moiety of the ANITS molecule). The fluorescence excitation and emission wavelengths of the derivatives were λ_ex = 250 nm and λ_em = 512 nm, respectively. Linear correlation coefficients for all fatty acid derivatives are >0.9999. Detection limits, at a signal‐to‐noise ratio of 3 : 1, are 24.76–98.79 fmol for the labeled fatty acids.     

AlN陶瓷的烧结致密化与导热性能

氮化铝陶瓷具有高热导率、低介电常数、与硅相匹配的热膨胀系数等优良特性,应用领域非常广泛。对A l N粉体的合成、烧结工艺、助烧结剂及其应用等方面进行了介绍,并对A l N未来的发展趋势进行了展望。     

溶剂萃取法回收与处理含DMAc废水的研究

本文研究了用低沸点萃取剂处理和回收含二甲基乙酰胺（DMAc)废水的可行性及工艺条件，经研究表明，在常温20－35℃时，用氯仿萃取二甲基乙酰胺，当溶剂与水相体积比为2：1时，经六级逆流萃取，可将废水中20％（w/w)的二甲基乙酰胺含量降至300mg/L以下。废水的pH值对萃取效率有明显的影响，当废水的pH值较大，即偏碱性对萃取有利。