老挝国家目前在天然橡胶良种繁育、芽接、开垦定植、胶林抚管、胶树病虫害防治、割胶、胶水凝固、原料存储、产品加工与检测等方面没有行业与国家标准,甚至不是 ISO 标委会成员国,在天然橡胶产业标准上是空白,导致在整个天然橡胶产业上...老挝国家目前在天然橡胶良种繁育、芽接、开垦定植、胶林抚管、胶树病虫害防治、割胶、胶水凝固、原料存储、产品加工与检测等方面没有行业与国家标准,甚至不是 ISO 标委会成员国,在天然橡胶产业标准上是空白,导致在整个天然橡胶产业上各环节管理粗放,特别是老挝北部胶农割胶时对胶水凝固剂的使用与原料采收储存极其随意,导致橡胶加工企业按照常规生产工艺加工的TSR20的塑性初值塑P0、性保持率 PRI 数值很低,一致性差。为了提高TSR20的P0、PRI数值与产品一致性,研究胶块破碎停放工艺对其P0、PRI的影响,实验结果表明:通过胶块破碎停放适宜时间后生产的TSR20产品的P0、PRI数值得到明显提高且达到中国国家标准值、一致性好,生产的TSR20可满足上海期货交易所对产品质量认证要求。展开更多
Abstract： 40K, 238U and 232Th in dust storms samples from AI-Najaf Holy Area - lraq in year 2013 were measured using a high efficiency gamma ray spectroscopy NaI（Tl） detector. From the measured gamma rays spectra, ...Abstract： 40K, 238U and 232Th in dust storms samples from AI-Najaf Holy Area - lraq in year 2013 were measured using a high efficiency gamma ray spectroscopy NaI（Tl） detector. From the measured gamma rays spectra, the specific activity were determined for 40K （range from 237.166 to 368.689 Bq/kg）, 23SU （range from 11.531 to 34.997 Bq/kg） and 232Th （range from 2.805 to 11.162 Bq/kg）. Hazard indices （external hazard index, internal hazard index, radium equivalent activities and absorbed effective dose rates） were calculated for the measured samples to assess the radiation hazards arising from dust storms samples, which is the average of Hazard indices equal （0.214, 0.192, 25.359 nG/y and 50.855 Bq/Kg）, respectively. All results of Hazard indices were compared with safe limit values recommended by UNSCEAR （2008） below the safe limit.展开更多
By the end of the year 2010, a total of 15 large tight gas fields have been found in China, located in the Ordos, Sichuan, and Tarim basins. The annual production and total reserves of these fields in 2010 were 222.5&...By the end of the year 2010, a total of 15 large tight gas fields have been found in China, located in the Ordos, Sichuan, and Tarim basins. The annual production and total reserves of these fields in 2010 were 222.5× 108 and 28657× 108 m3, respectively, accounting for 23.5% and 37.3%, respectively, of the total annual production and reserves of natural gases in China. They took a major part of all natural gas production and reserves in China. According to the analyses of 81 gas samples, the stable carbon and hydrogen isotopic compositions of tight gases in China have following characteristics： （1） Plots of δ13CI-δ13C2-δ13C3, δ13C1-C1/C2＋3 and δ13C1-δ 13C2 demonstrate the coal-derived origin of tight gases in China; （2） For the primary alkane gases, both carbon and hydrogen isotopic values increase with increasing molecular mass, i.e., δ13C1〈δ13C2〈δ13C3〈δ13C4 and δ2HI〈δ2Hz〈δ2H3; （3） The isotopic differences of δ13C2-δ13C1, δ13C3-δ13C1, δ2H2-δ22Hl and cTZH3-62H1 decrease with in- creasing Ro （%） and C1/C1-4; （4） There are seven causes for the carbon and hydrogen isotopic reversal, however, the carbon and hydrogen isotopic reversal of tight gases in China is caused mainly by multiple stages of gas charge and accumulation.展开更多
文摘老挝国家目前在天然橡胶良种繁育、芽接、开垦定植、胶林抚管、胶树病虫害防治、割胶、胶水凝固、原料存储、产品加工与检测等方面没有行业与国家标准,甚至不是 ISO 标委会成员国,在天然橡胶产业标准上是空白,导致在整个天然橡胶产业上各环节管理粗放,特别是老挝北部胶农割胶时对胶水凝固剂的使用与原料采收储存极其随意,导致橡胶加工企业按照常规生产工艺加工的TSR20的塑性初值塑P0、性保持率 PRI 数值很低,一致性差。为了提高TSR20的P0、PRI数值与产品一致性,研究胶块破碎停放工艺对其P0、PRI的影响,实验结果表明:通过胶块破碎停放适宜时间后生产的TSR20产品的P0、PRI数值得到明显提高且达到中国国家标准值、一致性好,生产的TSR20可满足上海期货交易所对产品质量认证要求。
文摘Abstract： 40K, 238U and 232Th in dust storms samples from AI-Najaf Holy Area - lraq in year 2013 were measured using a high efficiency gamma ray spectroscopy NaI（Tl） detector. From the measured gamma rays spectra, the specific activity were determined for 40K （range from 237.166 to 368.689 Bq/kg）, 23SU （range from 11.531 to 34.997 Bq/kg） and 232Th （range from 2.805 to 11.162 Bq/kg）. Hazard indices （external hazard index, internal hazard index, radium equivalent activities and absorbed effective dose rates） were calculated for the measured samples to assess the radiation hazards arising from dust storms samples, which is the average of Hazard indices equal （0.214, 0.192, 25.359 nG/y and 50.855 Bq/Kg）, respectively. All results of Hazard indices were compared with safe limit values recommended by UNSCEAR （2008） below the safe limit.
文摘By the end of the year 2010, a total of 15 large tight gas fields have been found in China, located in the Ordos, Sichuan, and Tarim basins. The annual production and total reserves of these fields in 2010 were 222.5× 108 and 28657× 108 m3, respectively, accounting for 23.5% and 37.3%, respectively, of the total annual production and reserves of natural gases in China. They took a major part of all natural gas production and reserves in China. According to the analyses of 81 gas samples, the stable carbon and hydrogen isotopic compositions of tight gases in China have following characteristics： （1） Plots of δ13CI-δ13C2-δ13C3, δ13C1-C1/C2＋3 and δ13C1-δ 13C2 demonstrate the coal-derived origin of tight gases in China; （2） For the primary alkane gases, both carbon and hydrogen isotopic values increase with increasing molecular mass, i.e., δ13C1〈δ13C2〈δ13C3〈δ13C4 and δ2HI〈δ2Hz〈δ2H3; （3） The isotopic differences of δ13C2-δ13C1, δ13C3-δ13C1, δ2H2-δ22Hl and cTZH3-62H1 decrease with in- creasing Ro （%） and C1/C1-4; （4） There are seven causes for the carbon and hydrogen isotopic reversal, however, the carbon and hydrogen isotopic reversal of tight gases in China is caused mainly by multiple stages of gas charge and accumulation.
