Topological method is applied firstly to calculate the group connectivity indexes of some flotation reagents for sulfide minerals and oxide minerals. The study reveals that some properties of flotation reagents, such ...Topological method is applied firstly to calculate the group connectivity indexes of some flotation reagents for sulfide minerals and oxide minerals. The study reveals that some properties of flotation reagents, such as group electronegativity, energy criterion, solubility product of chemicals and maximum wavelength of ultraviolet absorbency, have linear correlation with the first order group connectivity index (GCI) of polar group, and the related coefficients are all larger than 0.900. The GCI can be used to characterize the structure of groups, and is a sort of new effective structural parameter to study the quantitative structure activity relationship of flotation reagents.展开更多
In the course of organic synthesis, particularly for multi-step synthesis or natural product total synthesis, the selection of appropriate protective groups for the intended functionality is crucial in order to achiev...In the course of organic synthesis, particularly for multi-step synthesis or natural product total synthesis, the selection of appropriate protective groups for the intended functionality is crucial in order to achieve chemoselective synthetic goals. The development of many useful protective groups has been reported based on the functionality of the anilino group. Herein, we discuss our study of various protective groups and the processes we used to establish compatibility with anilino functionality via the implementation of Oxone-mediated oxidative esterification in methanol. The results and the details of our experiments are reported herein.展开更多
Distributed generators now is widely used in electrical power networks, in some cases it works seasonally, and some types works at special weather conditions like photo voltaic systems and wind energy, and due to this...Distributed generators now is widely used in electrical power networks, in some cases it works seasonally, and some types works at special weather conditions like photo voltaic systems and wind energy, and due to this continuous changes in generation condition, the fault current level in network will be affected, this changes in fault current level will affect in the coordination between protection relays and to keep the coordination at right way, an adaptive protection system is required that can adaptive its setting according to generation changes, the fault current level in each case is evaluated using ETAP software, and the required relay setting in each case is also evaluated using Grey Wolf Optimizer (GWO) algorithm, and to select suitable setting which required in each condition, to select the active setting group of protection relay according to generation capacity, central protection unite can be used, and to improve protection stability and minimizing relays tripping time, a proposed method for selecting suitable backup relay is used, which leads to decrease relays tripping time and increase system stability, output settings for relays in all cases achieved our constrains.展开更多
A new IL-supported diol, 1-（2,3-dihydroxypropyl）-3-methylimidazolium hexafluorophosphate has been synthesized and characterized by Fr-IR, ^1H NMR, ^13C NMR and MS （ESI）. Its physical properties such as freezing po...A new IL-supported diol, 1-（2,3-dihydroxypropyl）-3-methylimidazolium hexafluorophosphate has been synthesized and characterized by Fr-IR, ^1H NMR, ^13C NMR and MS （ESI）. Its physical properties such as freezing point, solubility and specific gravity and thermal stability were determined. Synthetic utilities of the resultant diol as a protecting group for aldehydes were also investigated.展开更多
On-surface synthesis of semiconducting graphdiyne nanowires usually suffer severe side reactions owing to the high reactivity of the butadiynylene units at noble metal surfaces,limiting the production of isolated nano...On-surface synthesis of semiconducting graphdiyne nanowires usually suffer severe side reactions owing to the high reactivity of the butadiynylene units at noble metal surfaces,limiting the production of isolated nanowires. In this work, we report the high-yield synthesis of branchless graphdiyne nanowires [-C≡C-Ph2-C≡C-]nvia on-surface Ullmann coupling of 1,4-bis（4-bromophenyl）-1,3-butadiyne molecules with chemical vapor deposition method.Non-contact atomic force microscopy with single-bond resolution reveals that single gold adatoms act as effective protecting groups for butadiynylene units by forming Au-π ligand bonds, preventing unwanted branched coupling reactions and enabling the synthesis of ultralong isolated graphdiyne nanowires. This study will stimulate further investigation on the role of various surface adatoms in protecting on-surface reactions.展开更多
-The effect of wave group on wave run-up on a slope dike is mainly discussed in this paper. Two simulating methods of wave group and their applications in laboratory are introduced. Synthesizing the research results o...-The effect of wave group on wave run-up on a slope dike is mainly discussed in this paper. Two simulating methods of wave group and their applications in laboratory are introduced. Synthesizing the research results of wave run-up on a slope dike, the effect of wave group on wave run-up on a slope dike in coastal protection engineering is studied as the main point.展开更多
Highly efficient removal of allyloxycarbonyl （Alloc） group was achieved in the presence of CH3COONH4, Pd[P（C6H5）3]4, and NaBH4 in MeOH-THF, within 5 min in almost quantitative yields （〉90%, isolated yield） with...Highly efficient removal of allyloxycarbonyl （Alloc） group was achieved in the presence of CH3COONH4, Pd[P（C6H5）3]4, and NaBH4 in MeOH-THF, within 5 min in almost quantitative yields （〉90%, isolated yield） without affecting acetyl, benzoyl, isopropylidene, benzylidene, allyl, benzyl, benzyl carbonate, or azido groups.展开更多
To further understand characters of alkaline phosphatase and provide reference for in-depth study of the mechanism of NFRKN-1 invading into knot nem-atode and its development and utilization, the effects of metal ions...To further understand characters of alkaline phosphatase and provide reference for in-depth study of the mechanism of NFRKN-1 invading into knot nem-atode and its development and utilization, the effects of metal ions, organic reagents and chemical modifier on activity of alkaline phosphatase from DFRKN-1 were analyzed in the paper. The results showed that Mg^2＋ , Ba^2＋ and K^＋ under certain concentrations activated enzyme significantly and Zn^2＋ could inhibit enzyme activ-ity. Methanol, ethanol and ethylene glycol inhibited enzyme activity in similar degrees. Histidine residue and Lysine residue are essential groups of alkaline pbos-phatase; sulflaydryl of cysteine was not an essential group, but disulfide bond played an important role in maintaining the active conformation of alkaline phospha-tase.展开更多
Protecting groups often play an essential role in organic synthesis, particularly for multi-step synthesis or natural product total synthesis. Various protecting groups areavailable to mask the vulnerable functionalit...Protecting groups often play an essential role in organic synthesis, particularly for multi-step synthesis or natural product total synthesis. Various protecting groups areavailable to mask the vulnerable functionality;phenolic hydroxy groups are noteworthy examples, but their stability differs when protected. Herein, the compatibility of protective phenolic functionality was investigated with the implementation of indium (III) triflate-catalyzed oxidative esterification using Oxone in methanol. A wide range of protective moieties was selected and subjected to Oxone-mediated oxidative esterification. For example, sulfonates were found to be sufficiently stable and inert whereas acetals were susceptible to reaction conditions. The details of this investigation are provided.展开更多
Sutong Bridge,as a world-record cable-stayed bridge with its main span exceeding 1 000 m constructed in Yangtze River estuary region in China,is located at a site with complicated hydrologic conditions and poor geotec...Sutong Bridge,as a world-record cable-stayed bridge with its main span exceeding 1 000 m constructed in Yangtze River estuary region in China,is located at a site with complicated hydrologic conditions and poor geotechnical conditions and therefore,scour protection will be a decisive factor for ensuring smooth and successful construction of this bridge.This paper,starting from structural description of deep-water group pile foundation,analyzes impact to the bridge safety introduced by scour and its protection and further presents different solutions of scour protection for foundation structures of this bridge.展开更多
On March 19, an academic forum was held in Jinan City, Shandong Province, on protection of vulnerable groups’ rights. Sponsored by the Law School of Shandong University, it gathered some 50 experts from the Central P...On March 19, an academic forum was held in Jinan City, Shandong Province, on protection of vulnerable groups’ rights. Sponsored by the Law School of Shandong University, it gathered some 50 experts from the Central Patty School, Chinese Academy of Social Sciences, China Society for Human Rights Studies, Shandong Higher People’s Court, as well as some research universities in the country. Four subjects were discussed at the forum: definition of vulnerable groups, legal principles for protection of vulnerable groups’展开更多
specific groups such as women,children,ethnic minorities,the elderly,and persons with disabilities are facing special difficulties in exercising their rights The protection of their rights is an important part of the ...specific groups such as women,children,ethnic minorities,the elderly,and persons with disabilities are facing special difficulties in exercising their rights The protection of their rights is an important part of the development of China’s human rights cause The Annual Report on China’s Human Rights have outlined the tremendous achievements China has made in protecting the rights of specific groups over the past ten years It also reflects that all human rights actors have born fruitful results of innovation in values,legal systems,paths for practice,and international cooperation of rights protection,which will continue to inspire and en courage people to participate in the common cause of human rights protection.展开更多
The confrontation between the disadvantaged and advantaged groups is eternal throughout the competition for survival. But the human spiritual world has its humane aspect in addition to competition. The concern for and...The confrontation between the disadvantaged and advantaged groups is eternal throughout the competition for survival. But the human spiritual world has its humane aspect in addition to competition. The concern for and protection of the disadvantaged group is the moral law characteristic of humanity, just as the Universal Declaration of Human Rights says in its Article 1： ＂All human beings are born free and equal in dignity and rights.展开更多
文摘Topological method is applied firstly to calculate the group connectivity indexes of some flotation reagents for sulfide minerals and oxide minerals. The study reveals that some properties of flotation reagents, such as group electronegativity, energy criterion, solubility product of chemicals and maximum wavelength of ultraviolet absorbency, have linear correlation with the first order group connectivity index (GCI) of polar group, and the related coefficients are all larger than 0.900. The GCI can be used to characterize the structure of groups, and is a sort of new effective structural parameter to study the quantitative structure activity relationship of flotation reagents.
文摘In the course of organic synthesis, particularly for multi-step synthesis or natural product total synthesis, the selection of appropriate protective groups for the intended functionality is crucial in order to achieve chemoselective synthetic goals. The development of many useful protective groups has been reported based on the functionality of the anilino group. Herein, we discuss our study of various protective groups and the processes we used to establish compatibility with anilino functionality via the implementation of Oxone-mediated oxidative esterification in methanol. The results and the details of our experiments are reported herein.
文摘Distributed generators now is widely used in electrical power networks, in some cases it works seasonally, and some types works at special weather conditions like photo voltaic systems and wind energy, and due to this continuous changes in generation condition, the fault current level in network will be affected, this changes in fault current level will affect in the coordination between protection relays and to keep the coordination at right way, an adaptive protection system is required that can adaptive its setting according to generation changes, the fault current level in each case is evaluated using ETAP software, and the required relay setting in each case is also evaluated using Grey Wolf Optimizer (GWO) algorithm, and to select suitable setting which required in each condition, to select the active setting group of protection relay according to generation capacity, central protection unite can be used, and to improve protection stability and minimizing relays tripping time, a proposed method for selecting suitable backup relay is used, which leads to decrease relays tripping time and increase system stability, output settings for relays in all cases achieved our constrains.
基金the National Natural Science Foundation of China(No.20533010,20673039)the Science&Technology Commission of Shanghai Municipality(No.06JC14023)for financial support.
文摘A new IL-supported diol, 1-（2,3-dihydroxypropyl）-3-methylimidazolium hexafluorophosphate has been synthesized and characterized by Fr-IR, ^1H NMR, ^13C NMR and MS （ESI）. Its physical properties such as freezing point, solubility and specific gravity and thermal stability were determined. Synthetic utilities of the resultant diol as a protecting group for aldehydes were also investigated.
基金the National Key R&D Program of China(No.2016YFA0200603 No.2017YFA0205004)the Anhui Initiative in Quantum Information Technologies(AHY090300)+2 种基金the National Natural Science Foundation of China(No.21473174)the Fundamental Research Funds for the Central Universities(No.WK2060190084 and No.WK2340000082)Ai-di Zhao acknowledges a fellow-ship from the Youth Innovation Promotion Association of Chinese Academy of Science(2011322).
文摘On-surface synthesis of semiconducting graphdiyne nanowires usually suffer severe side reactions owing to the high reactivity of the butadiynylene units at noble metal surfaces,limiting the production of isolated nanowires. In this work, we report the high-yield synthesis of branchless graphdiyne nanowires [-C≡C-Ph2-C≡C-]nvia on-surface Ullmann coupling of 1,4-bis（4-bromophenyl）-1,3-butadiyne molecules with chemical vapor deposition method.Non-contact atomic force microscopy with single-bond resolution reveals that single gold adatoms act as effective protecting groups for butadiynylene units by forming Au-π ligand bonds, preventing unwanted branched coupling reactions and enabling the synthesis of ultralong isolated graphdiyne nanowires. This study will stimulate further investigation on the role of various surface adatoms in protecting on-surface reactions.
文摘-The effect of wave group on wave run-up on a slope dike is mainly discussed in this paper. Two simulating methods of wave group and their applications in laboratory are introduced. Synthesizing the research results of wave run-up on a slope dike, the effect of wave group on wave run-up on a slope dike in coastal protection engineering is studied as the main point.
基金supported by Ph.D.Programs Foundation of Ministry of Education of China,(No.20070019072)the Research Foundation of China Agricultural University(No.90020031).
文摘Highly efficient removal of allyloxycarbonyl （Alloc） group was achieved in the presence of CH3COONH4, Pd[P（C6H5）3]4, and NaBH4 in MeOH-THF, within 5 min in almost quantitative yields （〉90%, isolated yield） without affecting acetyl, benzoyl, isopropylidene, benzylidene, allyl, benzyl, benzyl carbonate, or azido groups.
基金Supported by Key Laboratory Project of State Ethnic Affairs Commission (2010SY12)
文摘To further understand characters of alkaline phosphatase and provide reference for in-depth study of the mechanism of NFRKN-1 invading into knot nem-atode and its development and utilization, the effects of metal ions, organic reagents and chemical modifier on activity of alkaline phosphatase from DFRKN-1 were analyzed in the paper. The results showed that Mg^2＋ , Ba^2＋ and K^＋ under certain concentrations activated enzyme significantly and Zn^2＋ could inhibit enzyme activ-ity. Methanol, ethanol and ethylene glycol inhibited enzyme activity in similar degrees. Histidine residue and Lysine residue are essential groups of alkaline pbos-phatase; sulflaydryl of cysteine was not an essential group, but disulfide bond played an important role in maintaining the active conformation of alkaline phospha-tase.
文摘Protecting groups often play an essential role in organic synthesis, particularly for multi-step synthesis or natural product total synthesis. Various protecting groups areavailable to mask the vulnerable functionality;phenolic hydroxy groups are noteworthy examples, but their stability differs when protected. Herein, the compatibility of protective phenolic functionality was investigated with the implementation of indium (III) triflate-catalyzed oxidative esterification using Oxone in methanol. A wide range of protective moieties was selected and subjected to Oxone-mediated oxidative esterification. For example, sulfonates were found to be sufficiently stable and inert whereas acetals were susceptible to reaction conditions. The details of this investigation are provided.
基金National Science and Technology Support Program(No.2006BAG04B05)
文摘Sutong Bridge,as a world-record cable-stayed bridge with its main span exceeding 1 000 m constructed in Yangtze River estuary region in China,is located at a site with complicated hydrologic conditions and poor geotechnical conditions and therefore,scour protection will be a decisive factor for ensuring smooth and successful construction of this bridge.This paper,starting from structural description of deep-water group pile foundation,analyzes impact to the bridge safety introduced by scour and its protection and further presents different solutions of scour protection for foundation structures of this bridge.
文摘On March 19, an academic forum was held in Jinan City, Shandong Province, on protection of vulnerable groups’ rights. Sponsored by the Law School of Shandong University, it gathered some 50 experts from the Central Patty School, Chinese Academy of Social Sciences, China Society for Human Rights Studies, Shandong Higher People’s Court, as well as some research universities in the country. Four subjects were discussed at the forum: definition of vulnerable groups, legal principles for protection of vulnerable groups’
文摘specific groups such as women,children,ethnic minorities,the elderly,and persons with disabilities are facing special difficulties in exercising their rights The protection of their rights is an important part of the development of China’s human rights cause The Annual Report on China’s Human Rights have outlined the tremendous achievements China has made in protecting the rights of specific groups over the past ten years It also reflects that all human rights actors have born fruitful results of innovation in values,legal systems,paths for practice,and international cooperation of rights protection,which will continue to inspire and en courage people to participate in the common cause of human rights protection.
文摘The confrontation between the disadvantaged and advantaged groups is eternal throughout the competition for survival. But the human spiritual world has its humane aspect in addition to competition. The concern for and protection of the disadvantaged group is the moral law characteristic of humanity, just as the Universal Declaration of Human Rights says in its Article 1： ＂All human beings are born free and equal in dignity and rights.
