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We studied the local structure and properties of six-fold coordinated silicon(Si~([6])) in BaOSiO_2-P_2O_5 glasses. Nuclear magnetic resonance(NMR) and Raman spectroscopy revealed the existence of sixfold coordinated silicon species and network former units(NFUs) in the BaO-SiO_2-P_2O_5 glasses. The glass transition temperature(Tg), which was measured by differential scanning calorimetry, increased rapidly along with the increase of SiO_2 from 0 to 10 mol%, then declined and finally increased again, which showed a "Z" trend along with the increase of SiO_2 while the density of the glasses showed the opposite trend. When the addition of SiO_2 is 16 mol%, Tg decreased to an extremely low value(807.9 K). Besides, the Vickers indentation hardness(Hv) had been significantly enhanced from 4.66 to 6.63 GPa by adding 16 mol% SiO_2. Furthermore, the liquid fragility index(m) of the glasses declined slowly firstly and then increased rapidly when the amount of SiO_2 is greater than 13 mol%. 相似文献
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Bt新菌株GGD-4的特性研究与杀虫晶体蛋白基因鉴定 总被引:2,自引:0,他引:2
从连云港地区的土壤中分离得到一株苏云金芽孢杆菌新菌株GGD-4,对此菌株的个体形态、生理生化特点进行了研究,并通过PCR-RFLP鉴定体系分析了此菌株中cry基因类型,为进一步利用该菌株奠定了基础. 相似文献
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在介绍研究区第四纪地质、水文地质条件的基础上,从浅层地温场、岩土热物性方面分析了台州市滨海工业区浅层地温能赋存特征,评价了滨海工业区地埋管地源热泵系统开发利用适宜性为较适宜,计算了区内浅层地热总容量为2.99×10~(13) kJ/℃,折合标准煤为1.02×10~9 kg,可利用浅层地温能资源为9.21×10~(12) kJ,折合标准煤5.26×10~8 kg。对滨海工业区进行地埋管系统浅层地温能开发潜力评价,结果为:夏季可供制冷面积为4.2×10~6 m~2,冬季可供取暖面积为6.7×10~6 m~2。并结合台州湾循环经济产业集聚区发展规划,提出浅层地温能开发应用建议。 相似文献
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麻城市两路口钨矿床为武当—桐柏—大别成矿带鄂北麻城地区首次发现的白钨矿矿床。矿体赋存于研究区近东西向发育的构造破碎带内,矿体主要受近东西向断层控制,矿体产状及品位稳定。矿体围岩主要为黑云二长花岗质片麻岩,其次为花岗斑岩脉、闪长岩脉;矿体赋存状态不受围岩岩性制约,钼矿(化)发育于钨矿体南部或下部,钨、钼矿化不共生;通过近一年的地质找矿工作,已控制的主矿脉W1资源量(3341)已达小—中型矿床规模,两路口普查区有较大的找钨矿前景。通过研究麻城市两路口白钨矿床成矿地质条件、矿化富集规律以及矿床的主要控矿因素,认为该矿床为高温热液裂隙充填型白钨矿床,主矿体南部及深部存在较大找矿前景,其找矿方向认识对开拓桐柏—大别成矿带钨矿找矿思路有一定的指示意义。 相似文献
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