The bedrock weathered crust in front of the Altun Mountains in the Qaidam Basin,western China,is different from others because this is a salt-lake basin,where saline water fluid infiltrates and is deposited in the ove...The bedrock weathered crust in front of the Altun Mountains in the Qaidam Basin,western China,is different from others because this is a salt-lake basin,where saline water fluid infiltrates and is deposited in the overlying strata.A large amount of gypsum infills the bedrock weathered crust,and this has changed the pore structure.Using core observation,polarized light microscopy,electron probe,physical property analysis and field emission scanning electron microscopy experiments,the characteristics of the weathered bedrock have been studied.There are cracks and a small number of dissolved pores in the interior of the weathered crust.Matrix micropores are widely developed,especially the various matrix cracks formed by tectonics and weathering,as well as the stress characteristics of small dissolved pores,and physical properties such as porosity and permeability.This‘dual structure’developed in the bedrock is important for guiding the exploration of the lake basin bedrock for natural gas.展开更多
背景口腔癌具有较高的发病率,大多数口腔癌是由口腔潜在恶性疾患造成,口腔白斑是常见的口腔潜在恶性病变。口腔白斑恶变不仅会影响患者的身心健康,而且会给患者家庭和社会带来沉重的经济负担。由于受到样本量、地区差异等因素的限制,我...背景口腔癌具有较高的发病率,大多数口腔癌是由口腔潜在恶性疾患造成,口腔白斑是常见的口腔潜在恶性病变。口腔白斑恶变不仅会影响患者的身心健康,而且会给患者家庭和社会带来沉重的经济负担。由于受到样本量、地区差异等因素的限制,我国口腔白斑患者恶变的流行病学特征结果不一。目的系统评价中国人群口腔白斑的恶变率。方法计算机检索中国知网、中国生物医学文献数据库、维普中文科技期刊全文数据库、万方数据知识服务平台、PubMed、Web of Science、Embase、Cochrane Library,获取有关中国人群口腔白斑恶变率的队列研究,检索时限均为建库至2022年2月,由2名研究员独立筛选文献,对纳入的研究进行质量评价与数据提取,采用Stata 15.0软件进行统计学分析。结果最终纳入30篇队列研究,包括109047例患者。Meta分析结果显示,我国口腔白斑患者恶变率为9.0%〔95%CI(7.0%,11.3%)〕。亚组分析结果显示,男性患者口腔白斑恶变率为7.6%〔95%CI(5.1%,10.6%)〕,女性患者口腔白斑恶变率为13.2%〔95%CI(9.5%,17.4%)〕;<60岁患者口腔白斑恶变率为12.3%〔95%CI(9.2%,15.7%)〕,≥60岁患者口腔白斑恶变率为17.9%〔95%CI(13.8%,22.5%)〕;舌部口腔白斑患者的恶变率为16.2%〔95%CI(11.0%,22.2%)〕,其他部位口腔白斑患者的恶变率为6.1%〔95%CI(3.2%,9.6%)〕。结论当前证据表明,中国人群口腔白斑的恶变率较高,女性、年龄≥60岁、舌部口腔白斑恶变率较高。展开更多
基金the National Major Project of Science and Technology in developing great oil&gas field and coal bed gas(Grant No.2016ZX05007-006)the Study on water-cut control and production stabilization in the old gasfields and efficient development in new gasfields in Qaidam Basin(Grant No.2016E-0106GF)。
文摘The bedrock weathered crust in front of the Altun Mountains in the Qaidam Basin,western China,is different from others because this is a salt-lake basin,where saline water fluid infiltrates and is deposited in the overlying strata.A large amount of gypsum infills the bedrock weathered crust,and this has changed the pore structure.Using core observation,polarized light microscopy,electron probe,physical property analysis and field emission scanning electron microscopy experiments,the characteristics of the weathered bedrock have been studied.There are cracks and a small number of dissolved pores in the interior of the weathered crust.Matrix micropores are widely developed,especially the various matrix cracks formed by tectonics and weathering,as well as the stress characteristics of small dissolved pores,and physical properties such as porosity and permeability.This‘dual structure’developed in the bedrock is important for guiding the exploration of the lake basin bedrock for natural gas.
文摘背景口腔癌具有较高的发病率,大多数口腔癌是由口腔潜在恶性疾患造成,口腔白斑是常见的口腔潜在恶性病变。口腔白斑恶变不仅会影响患者的身心健康,而且会给患者家庭和社会带来沉重的经济负担。由于受到样本量、地区差异等因素的限制,我国口腔白斑患者恶变的流行病学特征结果不一。目的系统评价中国人群口腔白斑的恶变率。方法计算机检索中国知网、中国生物医学文献数据库、维普中文科技期刊全文数据库、万方数据知识服务平台、PubMed、Web of Science、Embase、Cochrane Library,获取有关中国人群口腔白斑恶变率的队列研究,检索时限均为建库至2022年2月,由2名研究员独立筛选文献,对纳入的研究进行质量评价与数据提取,采用Stata 15.0软件进行统计学分析。结果最终纳入30篇队列研究,包括109047例患者。Meta分析结果显示,我国口腔白斑患者恶变率为9.0%〔95%CI(7.0%,11.3%)〕。亚组分析结果显示,男性患者口腔白斑恶变率为7.6%〔95%CI(5.1%,10.6%)〕,女性患者口腔白斑恶变率为13.2%〔95%CI(9.5%,17.4%)〕;<60岁患者口腔白斑恶变率为12.3%〔95%CI(9.2%,15.7%)〕,≥60岁患者口腔白斑恶变率为17.9%〔95%CI(13.8%,22.5%)〕;舌部口腔白斑患者的恶变率为16.2%〔95%CI(11.0%,22.2%)〕,其他部位口腔白斑患者的恶变率为6.1%〔95%CI(3.2%,9.6%)〕。结论当前证据表明,中国人群口腔白斑的恶变率较高,女性、年龄≥60岁、舌部口腔白斑恶变率较高。
