本研究采用2000—2015年气象站点数据,分析贵州不同烟区主要气象因子的时间、空间动态特征,结合烤烟种植适宜条件与省外邻近烟区进行比较,解析贵州烟区气象条件的生态适宜性,阐明贵州烟区大田不同生育期的主要气象资源匹配、限制问题,...本研究采用2000—2015年气象站点数据,分析贵州不同烟区主要气象因子的时间、空间动态特征,结合烤烟种植适宜条件与省外邻近烟区进行比较,解析贵州烟区气象条件的生态适宜性,阐明贵州烟区大田不同生育期的主要气象资源匹配、限制问题,并提出相应的农艺解决措施。结果表明:(1)贵州烟区对比邻近烟区日均气温总体呈现先升高后下降的趋势,日均气温变异系数在前期和后期较高,中期相对稳定;黔西地区日均气温未满足烤烟生育期内对热量条件的要求;(2)贵州烟区及对比烟区降水基本集中在年积日(day of the year,DOY)121~271的时间范围内,该时期降水量变异系数也相对较低且变幅较小,降水总量为838.51 mm,满足了烤烟不同生育期对降水的需求;(3)贵州烟区日照时数在DOY 1~181和DOY 271~361时间范围内明显偏低,变异系数偏大;在DOY 182~270的时间范围内日照时数及其变异系数与对比烟区基本吻合;(4)与对比烟区相比,相同时间贵州烟区相对湿度偏高,尤其以DOY 1~166和DOY 286~361时间段内差异显著;(5)基于气候资源匹配下烤烟生育期时间优化研究后,黔北地区4月20日左右、黔东地区4月26日左右、黔南和黔中地区4月21-26日左右、黔西地区5月1日左右是当地烤烟适宜移栽期。综上,依据区域内不同地区主要气象指标的动态特征,结合地膜覆盖、群体结构调整等栽培措施,将烤烟移栽期适当前移有利于烤烟的优质生产,本研究为合理确定不同地区烤烟适宜移栽期提供了理论依据。展开更多
主要简述了PSPC标准的关键技术要求及对企鹅圆筒型FPSO项目的建造影响。PSPC相关规定对压载舱和货油舱油漆的破损率有着严格的要求,船坞合拢后,压载舱内部和货油舱做油漆破损评估要是破损面积超过压载舱总面积的2%或者连续破损超过25 m ...主要简述了PSPC标准的关键技术要求及对企鹅圆筒型FPSO项目的建造影响。PSPC相关规定对压载舱和货油舱油漆的破损率有着严格的要求,船坞合拢后,压载舱内部和货油舱做油漆破损评估要是破损面积超过压载舱总面积的2%或者连续破损超过25 m 2时就不能用手工除锈打磨的方法来进行二次除锈,必须对舱室破损处进行冲砂处理。本文着眼公司现状提前筹划从优化分段划分、使用新型工装脚手、开展分段预舾装、预密性试验等方面减少油漆破损以满足PSPC标准的要求。展开更多
Based on the reverse microemulsion technique, luminescent quantum dots doped core-shell nanoparticles have been prepared by employing silica as the shell and CdTe quantum dots as the core of the nanoparticles, which h...Based on the reverse microemulsion technique, luminescent quantum dots doped core-shell nanoparticles have been prepared by employing silica as the shell and CdTe quantum dots as the core of the nanoparticles, which have an excellent solubility and dispersibility, especially amine and phosphonate groups have been modified on their surface synchronously. In comparison with CdTe quantum dots, these nanoparticles show superiority in chemical and photo-chemical stability. The quantum dots doped core-shell nanoparticles were successfully linked with lactobionic acid by amine group on it, which was used to recognize living liver cells.展开更多
Tremendous interest has been evoked in the utility of the fluorescent conjugated polymers towards the creation of ultra-sensitive systems based on the molecular wire effects which can amplify the transduction events. ...Tremendous interest has been evoked in the utility of the fluorescent conjugated polymers towards the creation of ultra-sensitive systems based on the molecular wire effects which can amplify the transduction events. Here, a series of new polymers pyridine substitute poly (phen- ylene ethynylene)s are synthesized by Sonogashira-Hagihara coupling reaction. The impact of structure modification on the physical properties and spectral characteristics of poly-mers has been investigated. The quenching studies are car-ried out and exhibit that recognition site (pyridyle group) highly influences the quenching efficiency. The results show that polymer PI with pyridyl group entrapped in the conju-gated backbone has the specific and sensitive response to Pd(Ⅱ). The fluorescence quenching of PⅠby Pd(Ⅱ) is about 65 times greater than that of model monomer.展开更多
文摘本研究采用2000—2015年气象站点数据,分析贵州不同烟区主要气象因子的时间、空间动态特征,结合烤烟种植适宜条件与省外邻近烟区进行比较,解析贵州烟区气象条件的生态适宜性,阐明贵州烟区大田不同生育期的主要气象资源匹配、限制问题,并提出相应的农艺解决措施。结果表明:(1)贵州烟区对比邻近烟区日均气温总体呈现先升高后下降的趋势,日均气温变异系数在前期和后期较高,中期相对稳定;黔西地区日均气温未满足烤烟生育期内对热量条件的要求;(2)贵州烟区及对比烟区降水基本集中在年积日(day of the year,DOY)121~271的时间范围内,该时期降水量变异系数也相对较低且变幅较小,降水总量为838.51 mm,满足了烤烟不同生育期对降水的需求;(3)贵州烟区日照时数在DOY 1~181和DOY 271~361时间范围内明显偏低,变异系数偏大;在DOY 182~270的时间范围内日照时数及其变异系数与对比烟区基本吻合;(4)与对比烟区相比,相同时间贵州烟区相对湿度偏高,尤其以DOY 1~166和DOY 286~361时间段内差异显著;(5)基于气候资源匹配下烤烟生育期时间优化研究后,黔北地区4月20日左右、黔东地区4月26日左右、黔南和黔中地区4月21-26日左右、黔西地区5月1日左右是当地烤烟适宜移栽期。综上,依据区域内不同地区主要气象指标的动态特征,结合地膜覆盖、群体结构调整等栽培措施,将烤烟移栽期适当前移有利于烤烟的优质生产,本研究为合理确定不同地区烤烟适宜移栽期提供了理论依据。
文摘主要简述了PSPC标准的关键技术要求及对企鹅圆筒型FPSO项目的建造影响。PSPC相关规定对压载舱和货油舱油漆的破损率有着严格的要求,船坞合拢后,压载舱内部和货油舱做油漆破损评估要是破损面积超过压载舱总面积的2%或者连续破损超过25 m 2时就不能用手工除锈打磨的方法来进行二次除锈,必须对舱室破损处进行冲砂处理。本文着眼公司现状提前筹划从优化分段划分、使用新型工装脚手、开展分段预舾装、预密性试验等方面减少油漆破损以满足PSPC标准的要求。
基金This work was supported by the National Key Basic Research Program of China(Grant No.2002CB5 13100)the Na-tional Natural Science Foundation of China(Grant No.20305006)+1 种基金Key Project Foundation of the Education Ministry of China(Grant No.03181)Key Project of Hunan Province Technology Plan(Grant No.0399Y 1006).
文摘Based on the reverse microemulsion technique, luminescent quantum dots doped core-shell nanoparticles have been prepared by employing silica as the shell and CdTe quantum dots as the core of the nanoparticles, which have an excellent solubility and dispersibility, especially amine and phosphonate groups have been modified on their surface synchronously. In comparison with CdTe quantum dots, these nanoparticles show superiority in chemical and photo-chemical stability. The quantum dots doped core-shell nanoparticles were successfully linked with lactobionic acid by amine group on it, which was used to recognize living liver cells.
文摘Tremendous interest has been evoked in the utility of the fluorescent conjugated polymers towards the creation of ultra-sensitive systems based on the molecular wire effects which can amplify the transduction events. Here, a series of new polymers pyridine substitute poly (phen- ylene ethynylene)s are synthesized by Sonogashira-Hagihara coupling reaction. The impact of structure modification on the physical properties and spectral characteristics of poly-mers has been investigated. The quenching studies are car-ried out and exhibit that recognition site (pyridyle group) highly influences the quenching efficiency. The results show that polymer PI with pyridyl group entrapped in the conju-gated backbone has the specific and sensitive response to Pd(Ⅱ). The fluorescence quenching of PⅠby Pd(Ⅱ) is about 65 times greater than that of model monomer.
