排序方式: 共有39条查询结果,搜索用时 31 毫秒
11.
论蓬家夼金矿的地质特征及成因——与聂爱国等商榷 总被引:1,自引:0,他引:1
蓬家夼金矿是山东乳山地区新发现的金矿类型 ,受荆山群中的构造角砾岩系控制 ,沿胶莱盆地边缘莱阳组砾岩与荆山群副变质岩的构造接触带分布。矿体严格受滑脱构造控制 ,与荆山群变质杂岩中的大理岩、含石墨岩系关系密切。矿床地球化学特征表明 ,矿质主要来自围岩荆山群地层。认为蓬家夼金矿是在白垩系火山活动期间 ,以大气降水为主的混合水循环系统 ,萃取围岩 (主要是荆山群 )中的成矿物质 ,沿滑脱断层沉淀形成的 ,而不是前人所确定的沉积 -改造作用形成的新类型金矿床。 相似文献
12.
13.
由于褐煤煤质因地域而不同,导致热解气有效成分与CO_2的分布差异较大,为此本文利用吡啶对内蒙古东胜褐煤和澳大利亚Yallourn褐煤进行索氏抽提,通过对原煤及抽提残煤的FTIR表征和抽提物的GC/MS表征分析,获取褐煤分子结构信息;同时,对两种褐煤进行等温热解实验,研究了其化学组成与热解过程CO_2分布的关系。结果表明:两种褐煤的芳香度都较低,含氧官能团丰富;澳大利亚褐煤含有更多的羟基、羰基、羧基。两种褐煤抽提物中酚和醇含量大致相同,澳大利亚褐煤抽提物中酸、醚和酯含量分别比东胜褐煤抽提物多4.18%、5.17%、4.22%,酮则少了6.62%;且澳大利亚褐煤抽提物中含有更多的氧氮取代基团,反应活性更强。澳大利亚褐煤热解反应温度偏低,且700℃时CO_2的产量比东胜褐煤多82.6%;两种褐煤热解气中CO_2的生成主要是褐煤中羧基的断裂,较高温度下芳香酸和酯类的分解也有一定贡献。 相似文献
14.
自驾游客对低碳旅游交通的意愿及其影响因素研究——以浙江舟山普陀金三角旅游区为例 总被引:1,自引:0,他引:1
运用问卷调查法和多分类Logistic回归模型,以舟山普陀金三角旅游区为案例地,对自驾游客对低碳旅游交通的意愿及其影响因素进行了研究.结果表明:在支持低碳旅游交通的939位自驾受访游客中,有25.77%的受访游客愿意选择旅游交通碳减排方式一(长途汽车),有35.46%的受访游客愿意选择旅游交通碳减排方式二(火车),有38.77%的受访游客愿意选择旅游交通碳补偿方式(交纳碳排放增量税用于植树造林).自驾游客旅游交通碳减少(碳减排和碳补偿)效果显著.各客源地用全部游客衡量,游客旅游交通的人均碳减少量处于12.548~28.516kg·人-1之间,短途客源地和中途客源地游客旅游交通的碳减少效果分别超过了50%和20%.客源地、学历、停留时间和收入对自驾游客选择旅游交通碳减排方式与选择旅游交通碳补偿方式具有显著影响.其中,个人年收入在10万元以上的自驾游客更愿意选择碳补偿方式. 相似文献
15.
Yu Qingdong Chi Kelian 《中国减灾(英文版)》1999,(4)
1TheLossesofProductionSuspending/CuttingandItsMeasuringScale1.1TheLossesofProductionSuspendingandCuttingThelossesofproductionsuspendingandcuttingmeanthelossesthattheenterpriseshavetostoporreduceitsproductionoperationandlowersitsproductionscaleforthew… 相似文献
16.
Yu Qingdong 《中国减灾(英文版)》2003,(2)
Disasterresistantengineeringmeanstheengineeringwiththepurposeofresistingandreducingvariouskindsofdisasterswhicharehappeningorwillpossiblyhappen ,anditcanalsobecalleddisas terreductionengineering .Comparedwithgeneralengineering ,disasterresistantengineeringhasmanycharacteristics ,whicharebenefitedsociality ,benefitedvarietyanduniqueness ,investmenttrendsandengineering’shighrisk .Becauseofthesecharacteristics,cost benefitanalysisofdisasterresistanten gineeringisquitedifferentfromthatofgeneralen… 相似文献
17.
18.
Studies on the effect of the chlorine content of chlorophenols (CPs) on their adsorption from aqueous solution by mesoporous SBA-15 are important in understanding the mechanisms of CP adsorption. In this study, three CPs with different degrees of chlorine content (i.e., 2-chlorophenol, 2,6-dichlorophenol and 2,4,6-trichlorophenol) were investigated. The effects of parameters such as temperature and solution pH were studied. The results showed that CP adsorption by SBA-15 increased with increasing number of chlorine substituents and depended strongly on the temperature and solution pH. Thermodynamic parameters such as Gibbs free energy change (ΔG0), enthalpy change (ΔH0) and entropy change (ΔS0) were also calculated. By comparison of the adsorption coefficient of CPs with varying physical-chemical properties (size, hydrophobicity and electron density), we propose that hydrophobic interactions between CPs and the SBA-15 surface, as well as electron donor-acceptor (EDA) complexes between oxygen of the siloxane surface of SBA-15 (e--donor) and the πup-system of the CPs (e--acceptor), were dominant adsorption mechanisms. 相似文献
19.
20.