The library is the center of information gathering of a school.The collections present in the library can be regarded as a huge resource of information,consisting of rich knowledge contents from various disciplines.Ho...The library is the center of information gathering of a school.The collections present in the library can be regarded as a huge resource of information,consisting of rich knowledge contents from various disciplines.However,the access to this information is still considered imperfect,where many of these knowledge contents are rarely used or even touched while other resources were often left vacant which has led to many contradictions in the application of information resources in higher learning institution libraries.This article focuses on the analysis of the problems existing in the allocation and management of library information resources,with proposed corresponding solutions.展开更多
Through theoretical analysis,this paper expounds the value of strengthening the utilization of electronic information in university libraries and the reasons affecting the utilization rate of information resources in ...Through theoretical analysis,this paper expounds the value of strengthening the utilization of electronic information in university libraries and the reasons affecting the utilization rate of information resources in electronic libraries,so as to give better play to the role of university libraries and improve the utilization rate of electronic information in university libraries.In view of the existing problems,this paper puts forward measures to optimize the utilization rate of electronic information resources in university libraries and give full play to the role of electronic information resources,so as to promote information exchange and development.展开更多
Many libraries have built and opened the electronic reading room,electronic reading room security management has been paid more and more attention.In the specific safety management,the prevention and control of reader...Many libraries have built and opened the electronic reading room,electronic reading room security management has been paid more and more attention.In the specific safety management,the prevention and control of reader factors is very important.By comparing and analyzing the prevention and control of reader factors in the safety management of some electronic reading rooms,it can be found that the corresponding prevention and control situation is not ideal,and even there are some obvious problems,which also leads to great hidden dangers in the safety management level.This paper will specifically analyze the prevention and control of reader factors in the safety management of electronic reading room,and put forward more effective prevention and control strategies.展开更多
“Resource utilization”is the foundation of library services.This article analyzes the reasons of low utilization of library resources.Besides that,the existing resources are classified according to different genres....“Resource utilization”is the foundation of library services.This article analyzes the reasons of low utilization of library resources.Besides that,the existing resources are classified according to different genres.The methods of utilizing the existing resources in the library are also discussed.Based on the analysis,by optimizing the service patterns,the service reaches more targeted readers as well as improve the utilization rate of existing resources.展开更多
Twisted nanographenes(NGs)are currently attracting a lot of attention owing to their geometrical and electronic structures that differ substantively from conventional planar and nonplanar NGs,while the strategic synth...Twisted nanographenes(NGs)are currently attracting a lot of attention owing to their geometrical and electronic structures that differ substantively from conventional planar and nonplanar NGs,while the strategic synthesis of twisted NGs is still a topic of interest because the products are often interconvertible among unidirectionally,alternatively,or randomly twisted geometries and otherwise obtained as a mixture of them.Herein,we report the conformationally specific synthesis of twisted NGs where the geometry was reinforced by introducing 1,4-dioxane rings at a K-region of a central pyrene core that bears a large contortion.The 1,4-dioxane rings were generated by semi-deprotection,of tetraoxa[4.4.4]propellanes in precursor molecules,which were confirmed to be engaged in forming C-C bonds via a Friedel-Crafts type mechanism.The large contortion within the pyrene core causes a narrowed HOMO-LUMO gap on account of unusual pz-lobe overlap between+z and-z sides,giving rise to red emission with a high quantum yield of 94%as well as stable redox processes of 2e^(-)uptake/release.展开更多
Planarians provide the ideal model for studying eye development,with their simple eye structure and exceptionally rapid regeneration.Here,we observed the eye morphogenesis,photophobic behavior,spectral sensitivity and...Planarians provide the ideal model for studying eye development,with their simple eye structure and exceptionally rapid regeneration.Here,we observed the eye morphogenesis,photophobic behavior,spectral sensitivity and expression pattern of Djopsin in the freshwater planarian Dugesia japonica.The results showed that:(i)Djopsin encoding the putative protein belonged to the rhabdomeric opsins group and displayed high conservation during animal evolution;(ii)planarians displayed diverse photophobic response to different visible wavelengths and were more sensitive to light blue(495 nm)and yellow(635 nm);(iii)the morphogenesis and functional recovery of eyes were related to the expression pattern of Djopsin during head regeneration;and(iv)Djopsin gene plays a major role in functional recovery during eye regeneration and visual system maintenance in adult planarians.展开更多
文摘The library is the center of information gathering of a school.The collections present in the library can be regarded as a huge resource of information,consisting of rich knowledge contents from various disciplines.However,the access to this information is still considered imperfect,where many of these knowledge contents are rarely used or even touched while other resources were often left vacant which has led to many contradictions in the application of information resources in higher learning institution libraries.This article focuses on the analysis of the problems existing in the allocation and management of library information resources,with proposed corresponding solutions.
文摘Through theoretical analysis,this paper expounds the value of strengthening the utilization of electronic information in university libraries and the reasons affecting the utilization rate of information resources in electronic libraries,so as to give better play to the role of university libraries and improve the utilization rate of electronic information in university libraries.In view of the existing problems,this paper puts forward measures to optimize the utilization rate of electronic information resources in university libraries and give full play to the role of electronic information resources,so as to promote information exchange and development.
文摘Many libraries have built and opened the electronic reading room,electronic reading room security management has been paid more and more attention.In the specific safety management,the prevention and control of reader factors is very important.By comparing and analyzing the prevention and control of reader factors in the safety management of some electronic reading rooms,it can be found that the corresponding prevention and control situation is not ideal,and even there are some obvious problems,which also leads to great hidden dangers in the safety management level.This paper will specifically analyze the prevention and control of reader factors in the safety management of electronic reading room,and put forward more effective prevention and control strategies.
文摘“Resource utilization”is the foundation of library services.This article analyzes the reasons of low utilization of library resources.Besides that,the existing resources are classified according to different genres.The methods of utilizing the existing resources in the library are also discussed.Based on the analysis,by optimizing the service patterns,the service reaches more targeted readers as well as improve the utilization rate of existing resources.
基金provided by the National Natural Science Foundation of China(22161035)the Education Department of Inner Mongolia Autonomous Region(NJYT22089)+2 种基金the Funding Scheme for High-Level Overseas Chinese Students’Return,the International Collaborative Research Program of Institute for Chemical Research(ICR),Kyoto University(2022-39 and 2023-46)JSPS KAKENHI Grant JP22H04538,Advanced Technology Institute Research Grants 2023,ISHIZUE 2024 of Kyoto University,JACI Prize for Encouraging Young Researcher,Yazaki Memorial Foundation for Science and Technology,and the Asahi Glass Foundation.We are grateful to Mr.He Meng,Mr.Yuzhan Jiaosupport of NMR and quantum yield measurements.
文摘Twisted nanographenes(NGs)are currently attracting a lot of attention owing to their geometrical and electronic structures that differ substantively from conventional planar and nonplanar NGs,while the strategic synthesis of twisted NGs is still a topic of interest because the products are often interconvertible among unidirectionally,alternatively,or randomly twisted geometries and otherwise obtained as a mixture of them.Herein,we report the conformationally specific synthesis of twisted NGs where the geometry was reinforced by introducing 1,4-dioxane rings at a K-region of a central pyrene core that bears a large contortion.The 1,4-dioxane rings were generated by semi-deprotection,of tetraoxa[4.4.4]propellanes in precursor molecules,which were confirmed to be engaged in forming C-C bonds via a Friedel-Crafts type mechanism.The large contortion within the pyrene core causes a narrowed HOMO-LUMO gap on account of unusual pz-lobe overlap between+z and-z sides,giving rise to red emission with a high quantum yield of 94%as well as stable redox processes of 2e^(-)uptake/release.
基金supported by grants from the National Natural Science Foundation of China(Nos.31570376,31471965 and 31170357)the PhD Programs Foundation of the Ministry of Education of China(No.200804760003)+2 种基金the Innovation Foundation of Henan Province(No.2005126)the Basic and Advanced Technique Research Program of Technology Department of Henan Province(Nos.122300410142,142300410160)the College Students’Innovative Project(No.201410476066).
文摘Planarians provide the ideal model for studying eye development,with their simple eye structure and exceptionally rapid regeneration.Here,we observed the eye morphogenesis,photophobic behavior,spectral sensitivity and expression pattern of Djopsin in the freshwater planarian Dugesia japonica.The results showed that:(i)Djopsin encoding the putative protein belonged to the rhabdomeric opsins group and displayed high conservation during animal evolution;(ii)planarians displayed diverse photophobic response to different visible wavelengths and were more sensitive to light blue(495 nm)and yellow(635 nm);(iii)the morphogenesis and functional recovery of eyes were related to the expression pattern of Djopsin during head regeneration;and(iv)Djopsin gene plays a major role in functional recovery during eye regeneration and visual system maintenance in adult planarians.
