Georgian historiography dates the reign of King Vakhtang Gorgasali （Gorg-a-sar--＇wolf-head＇ in Persian） to the 2nd half of 5th century. The king is considered to have died in 502 in a fight with Persians. Cyril To...Georgian historiography dates the reign of King Vakhtang Gorgasali （Gorg-a-sar--＇wolf-head＇ in Persian） to the 2nd half of 5th century. The king is considered to have died in 502 in a fight with Persians. Cyril Toumanoff has expressed an opinion about the identification of Vakhtang Gorgasali with the King of Kartli Gurgen, mentioned by Procopius of Caesarea in 523. Accordingly, he believed that in case of such an identification, Vakhtang Gorgasali should have died in 527 during the big Persian invasion of Georgia. We have noticed that the author of the martyrdom of David and Constantine, who were based on the ancient chronicle （＂Dzveli Utskebani＂---Old Story） and who created his hagiographic work in the middle of 1 lth century, made a big mistake： erroneously, due to the similarity of names, he identified the sons of Georgian King Vakhtang Gorgasali Darchil and Mihrdat and the invasion of Persians in their reign with the sons of the ruler of Georgia （Kartli） Stephanoz III Mihrdat and Archil and invasions of Arabs and Marwan ibn Muhammad （Murvan Qru--＂Marwan the Deaf＇） that took place two centuries later, in the 30s of 8th century. Consequently, the author related the martyrdom on the background of Arab invasions. The fact that according to the author of the martyrdom, the sons of Vakhtang Gorgasali were in West Georgia, namely Anakopia, and fought the so-called Arabs there, makes it clear that the historical developments were taking place in the period of the Great Persian-Byzantine War of 542-562. In the title of the work it is mentioned that the invasion, during which the martyrdom of David and Constantine took place, happened in the vicinity of the death of Vakhtang Gorgasali. Thus, it becomes clear that King Vakhtang Gorgasali could not have died during the Persian-Byzantine War of 502-505 and that the Great Invasion of Persians described in the ＂Georgian Chronicles＂, in which Vakhtang Gorgasali was wounded, could only have happened in 527. The king must have died during a war between Persia and Byzantium in 527-532, more specifically in 527 when Persians invaded Georgia. Proceeding from the above, the surmise of Cyril Toumanoff regarding the death of Vakhtang Gorgasali in 527 becomes more convincing and well-grounded. Since it is known that King Vakhtang Gorgasali lived 60 years, the date of his birth can be presumed to be 466-467. This gives us an opportunity to establish a more precise date of reign ofVakhtang＇s father-Mihrdat and his grandfather-Archil. The dates of reign we have put forward for kings Mihrdat and Archil （Archil ,130-463, Mihrdat--463-473） correspond to the information of the Assyrian version of the Life of Peter the Iberian.展开更多
Extraction behavior of thorium(Ⅳ) and uranium(Ⅵ) from nitric acid(HNO_3) was studied using N,N,N',N'-tetraoctyldiglycolamide(TODGA) as extractant in different ionic liquids, and isooctane as comparison.Slope...Extraction behavior of thorium(Ⅳ) and uranium(Ⅵ) from nitric acid(HNO_3) was studied using N,N,N',N'-tetraoctyldiglycolamide(TODGA) as extractant in different ionic liquids, and isooctane as comparison.Slope analyses with varying HNO_3 concentrations and diluents revealed the extraction mechanism. With increasing length of alkyl chain and HNO_3 concentration, the extraction mechanism of TODGA/IL system changed from cation exchange to neutral complex and/or anion exchange,and the molar ratio between TODGA and metal ions varied gradually from 2:1 to 1:1 for Th(Ⅳ) and 3:1 to 1:1 for U(Ⅵ). The kinetics and thermodynamic studies of Th(Ⅳ)and U(Ⅵ) by the best TODGA/[C_2mim][NTf_2] system showed that the extraction equilibrium was reached within 2 h and extraction reactions were endothermic. Compared to TODGA/isooctane system, TODGA/[C_2mim][NTf_2]system presented higher radiation stability under c-irradiation. Therefore, it would have a promising application in spent fuel reprocessing.展开更多
A new kind of diamide N,N,N’,N’-tetrahexylsuccinylamide（THSA） was synthesized, characterized and used for the extraction of HNO3, U（VI） and TI（IV） in a diluent composed of 0.5 volume fraction 1,2,4-trimethy be...A new kind of diamide N,N,N’,N’-tetrahexylsuccinylamide（THSA） was synthesized, characterized and used for the extraction of HNO3, U（VI） and TI（IV） in a diluent composed of 0.5 volume fraction 1,2,4-trimethy benzene（TMB） and 0.5 volume fraction kerosene（OK）. Extraction distribution coefficients of U（VI） and TI（IV） as functions of aque- ous nitric acid concentration, extractant concentration, temperature and salting-out agent （LiNO3 ） have been studied, and it is found that THSA as an extractant is superior to TBP for extraction of U（VI） and TI（IV）. Back extraction was also studied. At low acidity, the main adduct of THSA and HNO3 is HNO3.THSA. THSA.（HNO3）2 and THSA.（HNO3）3 are also found at high acidity. The compositions of extracted species, apparent equilibrium constants and enthalpies of extraction reactions have also been calculated.展开更多
Two-dimensional layered IV-VI chalcogenides are attracting great interest for applications in next-generation optoelectronic, photovoltaic, and thermoelectric devices. However, great challenges in the controllable syn...Two-dimensional layered IV-VI chalcogenides are attracting great interest for applications in next-generation optoelectronic, photovoltaic, and thermoelectric devices. However, great challenges in the controllable synthesis of high-quality IV-VI chalcogenide nanostructures have hindered their in-depth studies and practical applications to date. Here we report, for the first time, a feasible synthesis of single-crystal IV-VI SnSe nanoplates in a controlled manner on mica substrates by vapor transport deposition. The as-grown SnSe nanoplates have approximately square shapes with controllable side lengths varying from I to 6 Dm. Electrical transport and optoelectronic measurements show that as-obtained SnSe nanoplates display p-type conductivity and high photoresponsivity.展开更多
A facile approach for the first total synthesis of prenylated flavonoids, （±）-abyssinone-VI-4-O-methyl ether 1, （±）-abyssinone- IV-4＇-O-methyl ether 2, （±）-abyssinone-V-4＇-O-methyl ether 3 and ...A facile approach for the first total synthesis of prenylated flavonoids, （±）-abyssinone-VI-4-O-methyl ether 1, （±）-abyssinone- IV-4＇-O-methyl ether 2, （±）-abyssinone-V-4＇-O-methyl ether 3 and （±）-sigmoidin E 4 has been described. The key intermediate 4-hydroxy-3,5-di-（3-methylbut-2-enyl）benzaldehyde 6 was also first synthesized that features regioselective prenylation of 4-hydroxybenzaldehyde and crystallizing with petroleum ether from the reaction mixture by freeze-out effect.展开更多
文摘Georgian historiography dates the reign of King Vakhtang Gorgasali （Gorg-a-sar--＇wolf-head＇ in Persian） to the 2nd half of 5th century. The king is considered to have died in 502 in a fight with Persians. Cyril Toumanoff has expressed an opinion about the identification of Vakhtang Gorgasali with the King of Kartli Gurgen, mentioned by Procopius of Caesarea in 523. Accordingly, he believed that in case of such an identification, Vakhtang Gorgasali should have died in 527 during the big Persian invasion of Georgia. We have noticed that the author of the martyrdom of David and Constantine, who were based on the ancient chronicle （＂Dzveli Utskebani＂---Old Story） and who created his hagiographic work in the middle of 1 lth century, made a big mistake： erroneously, due to the similarity of names, he identified the sons of Georgian King Vakhtang Gorgasali Darchil and Mihrdat and the invasion of Persians in their reign with the sons of the ruler of Georgia （Kartli） Stephanoz III Mihrdat and Archil and invasions of Arabs and Marwan ibn Muhammad （Murvan Qru--＂Marwan the Deaf＇） that took place two centuries later, in the 30s of 8th century. Consequently, the author related the martyrdom on the background of Arab invasions. The fact that according to the author of the martyrdom, the sons of Vakhtang Gorgasali were in West Georgia, namely Anakopia, and fought the so-called Arabs there, makes it clear that the historical developments were taking place in the period of the Great Persian-Byzantine War of 542-562. In the title of the work it is mentioned that the invasion, during which the martyrdom of David and Constantine took place, happened in the vicinity of the death of Vakhtang Gorgasali. Thus, it becomes clear that King Vakhtang Gorgasali could not have died during the Persian-Byzantine War of 502-505 and that the Great Invasion of Persians described in the ＂Georgian Chronicles＂, in which Vakhtang Gorgasali was wounded, could only have happened in 527. The king must have died during a war between Persia and Byzantium in 527-532, more specifically in 527 when Persians invaded Georgia. Proceeding from the above, the surmise of Cyril Toumanoff regarding the death of Vakhtang Gorgasali in 527 becomes more convincing and well-grounded. Since it is known that King Vakhtang Gorgasali lived 60 years, the date of his birth can be presumed to be 466-467. This gives us an opportunity to establish a more precise date of reign ofVakhtang＇s father-Mihrdat and his grandfather-Archil. The dates of reign we have put forward for kings Mihrdat and Archil （Archil ,130-463, Mihrdat--463-473） correspond to the information of the Assyrian version of the Life of Peter the Iberian.
基金financially supported by the National Natural Science Foundation of China(No.11475112)the Ph.D. Programs Foundation of Ministry of Education of China(No.20130073120051)the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning
文摘Extraction behavior of thorium(Ⅳ) and uranium(Ⅵ) from nitric acid(HNO_3) was studied using N,N,N',N'-tetraoctyldiglycolamide(TODGA) as extractant in different ionic liquids, and isooctane as comparison.Slope analyses with varying HNO_3 concentrations and diluents revealed the extraction mechanism. With increasing length of alkyl chain and HNO_3 concentration, the extraction mechanism of TODGA/IL system changed from cation exchange to neutral complex and/or anion exchange,and the molar ratio between TODGA and metal ions varied gradually from 2:1 to 1:1 for Th(Ⅳ) and 3:1 to 1:1 for U(Ⅵ). The kinetics and thermodynamic studies of Th(Ⅳ)and U(Ⅵ) by the best TODGA/[C_2mim][NTf_2] system showed that the extraction equilibrium was reached within 2 h and extraction reactions were endothermic. Compared to TODGA/isooctane system, TODGA/[C_2mim][NTf_2]system presented higher radiation stability under c-irradiation. Therefore, it would have a promising application in spent fuel reprocessing.
文摘A new kind of diamide N,N,N’,N’-tetrahexylsuccinylamide（THSA） was synthesized, characterized and used for the extraction of HNO3, U（VI） and TI（IV） in a diluent composed of 0.5 volume fraction 1,2,4-trimethy benzene（TMB） and 0.5 volume fraction kerosene（OK）. Extraction distribution coefficients of U（VI） and TI（IV） as functions of aque- ous nitric acid concentration, extractant concentration, temperature and salting-out agent （LiNO3 ） have been studied, and it is found that THSA as an extractant is superior to TBP for extraction of U（VI） and TI（IV）. Back extraction was also studied. At low acidity, the main adduct of THSA and HNO3 is HNO3.THSA. THSA.（HNO3）2 and THSA.（HNO3）3 are also found at high acidity. The compositions of extracted species, apparent equilibrium constants and enthalpies of extraction reactions have also been calculated.
文摘Two-dimensional layered IV-VI chalcogenides are attracting great interest for applications in next-generation optoelectronic, photovoltaic, and thermoelectric devices. However, great challenges in the controllable synthesis of high-quality IV-VI chalcogenide nanostructures have hindered their in-depth studies and practical applications to date. Here we report, for the first time, a feasible synthesis of single-crystal IV-VI SnSe nanoplates in a controlled manner on mica substrates by vapor transport deposition. The as-grown SnSe nanoplates have approximately square shapes with controllable side lengths varying from I to 6 Dm. Electrical transport and optoelectronic measurements show that as-obtained SnSe nanoplates display p-type conductivity and high photoresponsivity.
基金financially supported by the National Natural Science Foundation(Nos.21162021,20962016)Ningxia Natural Science Foundation(No.NZ1006)+1 种基金Program for New Century Excellent Talents in University(No. NCET-09-0860)the National Basic Research Program 973 of China(No.2010CB534916)
文摘A facile approach for the first total synthesis of prenylated flavonoids, （±）-abyssinone-VI-4-O-methyl ether 1, （±）-abyssinone- IV-4＇-O-methyl ether 2, （±）-abyssinone-V-4＇-O-methyl ether 3 and （±）-sigmoidin E 4 has been described. The key intermediate 4-hydroxy-3,5-di-（3-methylbut-2-enyl）benzaldehyde 6 was also first synthesized that features regioselective prenylation of 4-hydroxybenzaldehyde and crystallizing with petroleum ether from the reaction mixture by freeze-out effect.
