目的借助CiteSpaceⅤ软件对新生儿疼痛管理研究的相关文献进行可视化分析,以探讨其地区分布、趋势及热点。方法筛选出Web of Science TM核心合集数据库2000年至2018年新生儿疼痛管理方面的文献,通过CiteSpaceⅤ软件对国家、机构、关键...目的借助CiteSpaceⅤ软件对新生儿疼痛管理研究的相关文献进行可视化分析,以探讨其地区分布、趋势及热点。方法筛选出Web of Science TM核心合集数据库2000年至2018年新生儿疼痛管理方面的文献,通过CiteSpaceⅤ软件对国家、机构、关键词、被引文献等节点进行可视化分析。结果近年来新生儿疼痛管理研究呈现发展趋势,研究力量主要集中于欧美等发达国家,关键词及聚类分析显示新生儿操作性疼痛管理研究是该领域的研究热点,其中非药物性干预措施是其主要研究内容。结论在发达国家,新生儿疼痛管理受到高度重视,但在发展中国家(包括我国),医务人员仍缺乏对新生儿疼痛的认知及管理,应加强该领域相关医务人员对新生儿疼痛管理重要性的认识及疼痛管理的实施。展开更多
Nonlinear interaction of the Langmuir wave and the dust-acoustic wave in plasmas with the variable-charge grains has been investigated.In the approximation of small amplitude,we find the solution of envelope soliton f...Nonlinear interaction of the Langmuir wave and the dust-acoustic wave in plasmas with the variable-charge grains has been investigated.In the approximation of small amplitude,we find the solution of envelope soliton for the nonlinear Langmuir wave.The results show that the amplitude of envelope soliton increases with the increasing of dust grain density.展开更多
A fragment of 2000 bp upstream sequence of Ell clone was amplified from genomic DNA of the tomato cultivar Zhongshu- 5. Sequence analysis showed that the upstream contains the regulatory elements： TATA box （-29 - -2...A fragment of 2000 bp upstream sequence of Ell clone was amplified from genomic DNA of the tomato cultivar Zhongshu- 5. Sequence analysis showed that the upstream contains the regulatory elements： TATA box （-29 - -22）, CAAT box （-193 - -189）, wound, and drought response elements. Expression vectors of Ell promoter gus fusion were constructed with the promoters of 1 200 and 2 000 bp regions, respectively. Transgenic tomato plants were obtained through Agrobacteriummediated transformation. Histochemical analysis of GUS activity in various tissues showed that the two promoters were able to direct fruit-specific gene expression. The expression driven by promoter of 2 000 bp upstream fragment could increase GUS activity with the maturation of tomato fruits. The promoter of -1 200 bp fragment could direct gus gene expression in fruits with the inductions of drought and wounding. The regulatory region for fruit-specificity was probably located in the region of 1 200 bp of 5′-flanking sequence and some positive regulatory elements or enhancers may exist in the region from -1 200 to -2000 bp.展开更多
To study the effects of long-term no-tillage direct seeding mode on rice yield and the soil physiochemical property in a rice-rapeseed rotation system, a comparative experiment with a water-saving and drought-resistan...To study the effects of long-term no-tillage direct seeding mode on rice yield and the soil physiochemical property in a rice-rapeseed rotation system, a comparative experiment with a water-saving and drought-resistance rice （WDR） variety and a double low rapeseed variety as materials was conducted under no-tillage direct seeding （NTDS） mode and conventional tillage direct seeding （CTDS） mode for four years, using the CTDS mode as the control. Compared with the CTDS mode, the actual rice yield of WDR decreased by 8.10% at the first year, whereas the plant height, spikelet number per panicle, spikelet fertility, 1000-grain weight, grain yield, actual yield, and harvest index increased with no-tillage years, which led to the actual yield increase by 6.49% at the fourth year. Correlation analysis showed that the panicle length was significantly related to the actual yield of WDR. Compared with the CTDS mode in terms of the soil properties, the pH value of the NTDS mode decreased every year, whereas the contents of soil organic matter and total N of the NTDS mode increased. In the 0-5 cm layer of the NTDS mode, the soil bulk decreased, whereas the contents of soil organic matter, total N, and available N increased. In the 5-20 cm layer of the NTDS mode, the available N and K decreased, whereas the soil bulk, contents of soil organic matter, and total N increased. In summary, the NTDS mode increased the rice yield, and could improve the paddy soil fertility of the top layer.展开更多
Lattice wave of magnetized spherical dust in radio-frequency sheath with negative ions is investigated. The dispersion relation of two-dimensional hexagonal lattice horizontal wave and the influence of negative ions a...Lattice wave of magnetized spherical dust in radio-frequency sheath with negative ions is investigated. The dispersion relation of two-dimensional hexagonal lattice horizontal wave and the influence of negative ions and magnetic field intensity on the wave are also investigated. The results show that for two-dimensional hexagonal horizontal lattice wave, negative ions reduce the wave frequency at the range of long-wavelength, whereas raising the wave frequency at the range of short-wavelength and magnetic field contributes to dropping the wave frequency a little.展开更多
A new type of very low-frequency electrostatic wave in a dusty plasma,called the dust-drift waves,has been investigated with the three-component fluid model.The dispersion of the waves depends strongly on the dust gra...A new type of very low-frequency electrostatic wave in a dusty plasma,called the dust-drift waves,has been investigated with the three-component fluid model.The dispersion of the waves depends strongly on the dust grain content in plasma.Due to their nonlinear interaction,the dust-drift waves can form two-dimensional dip-hump and multi-peak localized structures.The amplitudes of those structures decrease with the increasing dust content.展开更多
The nonlinear kinetic Alfven waves in a low-β(0<β<1)dusty plasma have been investigated with the fluid model of three-component plasma. The nonlinear equation governing the perturbation density of electrons in...The nonlinear kinetic Alfven waves in a low-β(0<β<1)dusty plasma have been investigated with the fluid model of three-component plasma. The nonlinear equation governing the perturbation density of electrons in a form of the energy integral has been derived. In the approximation of small amplitude, the soliton solution for the perturbation density of electrons is found, and the characteristics of solitons in different range of plasma parameters is studied numerically. The results show that the density dip or hump can be formed in a dusty plasma for different ranges of parameters, the amplitude of density dip is enhanced and the amplitude of density hump is reduced with increasing dust grain content.展开更多
文摘目的借助CiteSpaceⅤ软件对新生儿疼痛管理研究的相关文献进行可视化分析,以探讨其地区分布、趋势及热点。方法筛选出Web of Science TM核心合集数据库2000年至2018年新生儿疼痛管理方面的文献,通过CiteSpaceⅤ软件对国家、机构、关键词、被引文献等节点进行可视化分析。结果近年来新生儿疼痛管理研究呈现发展趋势,研究力量主要集中于欧美等发达国家,关键词及聚类分析显示新生儿操作性疼痛管理研究是该领域的研究热点,其中非药物性干预措施是其主要研究内容。结论在发达国家,新生儿疼痛管理受到高度重视,但在发展中国家(包括我国),医务人员仍缺乏对新生儿疼痛的认知及管理,应加强该领域相关医务人员对新生儿疼痛管理重要性的认识及疼痛管理的实施。
基金the National Natural Science Foundation of China under Grant No.19775043.
文摘Nonlinear interaction of the Langmuir wave and the dust-acoustic wave in plasmas with the variable-charge grains has been investigated.In the approximation of small amplitude,we find the solution of envelope soliton for the nonlinear Langmuir wave.The results show that the amplitude of envelope soliton increases with the increasing of dust grain density.
基金This research work was partially supported by the National Natural Science Foundation of China(39770521,39200079)National 863 Program of China(2001AA212221).
文摘A fragment of 2000 bp upstream sequence of Ell clone was amplified from genomic DNA of the tomato cultivar Zhongshu- 5. Sequence analysis showed that the upstream contains the regulatory elements： TATA box （-29 - -22）, CAAT box （-193 - -189）, wound, and drought response elements. Expression vectors of Ell promoter gus fusion were constructed with the promoters of 1 200 and 2 000 bp regions, respectively. Transgenic tomato plants were obtained through Agrobacteriummediated transformation. Histochemical analysis of GUS activity in various tissues showed that the two promoters were able to direct fruit-specific gene expression. The expression driven by promoter of 2 000 bp upstream fragment could increase GUS activity with the maturation of tomato fruits. The promoter of -1 200 bp fragment could direct gus gene expression in fruits with the inductions of drought and wounding. The regulatory region for fruit-specificity was probably located in the region of 1 200 bp of 5′-flanking sequence and some positive regulatory elements or enhancers may exist in the region from -1 200 to -2000 bp.
基金supported by the Key Project of Developing Agriculture through Science and Technology of Shanghai Municipal Agricultural Commission,China(Grant No.2010-1-1)Shanghai Science and Technology Development Funds,China(Grant No.11QA1405900)the National High-Tech Research and Development Program of China(Grant No.2012AA101102)
文摘To study the effects of long-term no-tillage direct seeding mode on rice yield and the soil physiochemical property in a rice-rapeseed rotation system, a comparative experiment with a water-saving and drought-resistance rice （WDR） variety and a double low rapeseed variety as materials was conducted under no-tillage direct seeding （NTDS） mode and conventional tillage direct seeding （CTDS） mode for four years, using the CTDS mode as the control. Compared with the CTDS mode, the actual rice yield of WDR decreased by 8.10% at the first year, whereas the plant height, spikelet number per panicle, spikelet fertility, 1000-grain weight, grain yield, actual yield, and harvest index increased with no-tillage years, which led to the actual yield increase by 6.49% at the fourth year. Correlation analysis showed that the panicle length was significantly related to the actual yield of WDR. Compared with the CTDS mode in terms of the soil properties, the pH value of the NTDS mode decreased every year, whereas the contents of soil organic matter and total N of the NTDS mode increased. In the 0-5 cm layer of the NTDS mode, the soil bulk decreased, whereas the contents of soil organic matter, total N, and available N increased. In the 5-20 cm layer of the NTDS mode, the available N and K decreased, whereas the soil bulk, contents of soil organic matter, and total N increased. In summary, the NTDS mode increased the rice yield, and could improve the paddy soil fertility of the top layer.
基金The project supported by National Natural Science Foundation of China under Grant Nos. 10375063 and 40336052
文摘Lattice wave of magnetized spherical dust in radio-frequency sheath with negative ions is investigated. The dispersion relation of two-dimensional hexagonal lattice horizontal wave and the influence of negative ions and magnetic field intensity on the wave are also investigated. The results show that for two-dimensional hexagonal horizontal lattice wave, negative ions reduce the wave frequency at the range of long-wavelength, whereas raising the wave frequency at the range of short-wavelength and magnetic field contributes to dropping the wave frequency a little.
基金Supported by the National Natural Science Foundation of China under Grant No.19775043.
文摘A new type of very low-frequency electrostatic wave in a dusty plasma,called the dust-drift waves,has been investigated with the three-component fluid model.The dispersion of the waves depends strongly on the dust grain content in plasma.Due to their nonlinear interaction,the dust-drift waves can form two-dimensional dip-hump and multi-peak localized structures.The amplitudes of those structures decrease with the increasing dust content.
基金Supported by the National Natural Science Foundmation of China under Grant No.19775043.
文摘The nonlinear kinetic Alfven waves in a low-β(0<β<1)dusty plasma have been investigated with the fluid model of three-component plasma. The nonlinear equation governing the perturbation density of electrons in a form of the energy integral has been derived. In the approximation of small amplitude, the soliton solution for the perturbation density of electrons is found, and the characteristics of solitons in different range of plasma parameters is studied numerically. The results show that the density dip or hump can be formed in a dusty plasma for different ranges of parameters, the amplitude of density dip is enhanced and the amplitude of density hump is reduced with increasing dust grain content.
