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INDIRECT VOLTAMMETRIC DETERMINATION OF TRACE SULFATE IN NATURAL WATERS WITH THE ADSORPTIVE COMPLEX WAVE OF LEAD(Ⅱ)-TETRAKIS (4-TRIMETHYLAMMONIUM PHENYL) PORPHYRIN 认领 引用
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作者 Guo Cang LI Laboratory of Inorganic Analytical Chemistry, Research Center for Eco-Environmental Sciences, Academia Sinica, Beijing, 100085 《Chinese Chemical Letters》 SCIE EI CAS 1993年第11期985-988,共4页
The indirect voltammetric determination of trace sulfate (2.0×10-6～4.0×10-5 mol/L ) with the adsorptive complex wave of lead(Ⅱ)-tetrakis (4-trimethylammonium phenyl) porphyrin (PbTTMAPP) is reported.... The indirect voltammetric determination of trace sulfate (2.0×10-6～4.0×10-5 mol/L ) with the adsorptive complex wave of lead(Ⅱ)-tetrakis (4-trimethylammonium phenyl) porphyrin (PbTTMAPP) is reported.This method has been used for the analysis of natural waters with satisfactory results. 展开更多
关键词 INDIRECT VOLTAMMETRIC DETERMINATION OF TRACE SULFATE IN NATURAL WATERS WITH THE ADSORPTIVE COMPLEX WAVE OF LEAD TT Pb TRIMETHYLAMMONIUM PHENYL PORPHYRIN TETRAKIS PP
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A review of the research on complex erosion by wind and water 认领 引用 被引量：5
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作者 SONG Yang YAN Ping LIU Lianyou 《Journal of Geographical Sciences》 2006年第2期231-241,共11页
Complex erosion by wind and water, which is also called aeolian-fluvial interactions, is an important erosion process and landscape in arid and semiarid regions. The effectiveness of links between wind and water proce... Complex erosion by wind and water, which is also called aeolian-fluvial interactions, is an important erosion process and landscape in arid and semiarid regions. The effectiveness of links between wind and water process, spatial environmental transitions and temporal environmental change are the three main driving forces determining the geomorphologic significance of aeolian-fluvial interactions. As a complex interrelating and intercoupling system, complex erosion by wind and water has spatial- temporal variation features. The process of complex erosion by wind and water can be divided into palaeoenvironmental process and contemporary process. Early work in drylands has often been attributed to one of two schools advocating either an ＇aeolianist＇ or a ＇fluvialist＇ perspective, so it was not until the 1930s that the research on complex erosion by wind and water had been conducted. There are two obstacles restricting the research of complex erosion by wind and water. Firstly, how to transform in different temporal and spatial scales is still unsettled; and secondly, the research methodology is still immature. In the future, the mechanism and control of erosion, the complex soil erodibility in wind and water erosion will be the focus of research on complex erosion by wind and water. 展开更多
关键词 complex erosion by wind and water aeolian-fluvial interactions semiarid regions sediment contemporary process
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Magnetic and electro-catalytic properties of a copper complex with 2-(pyridylmethyl)amino-N,N-bis(2-methylene-4,6-difluorophenol) 认领 引用 被引量：1
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作者 Dong Li Chen-Neng Lin +1 位作者 Shu-Zhong Zhan Chun-Lin Ni 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第7期1424-1428,共5页
A new material for both magnetic coupling and electrocatalytic hydrogen generation based on a copper complex,[（HL）CuCl-CuCl（HL）]HCl 1 is prepared by the reaction of 2-（pyridylmethyl）amino-N,N-bis（2-methylene-4,... A new material for both magnetic coupling and electrocatalytic hydrogen generation based on a copper complex,[（HL）CuCl-CuCl（HL）]HCl 1 is prepared by the reaction of 2-（pyridylmethyl）amino-N,N-bis（2-methylene-4,6-difluorophenol）（H2L） and CuCl2·2H2O.In solid,complex 1 is built from two copper units（[（HL）CuCl]）,and exhibits an antiferromagnetic exchange interaction between copper（Ⅱ） ions（J=-160cm^-1）.In liquid,1 can electrocatalyze hydrogen generation both from acetic acid with a turnover frequency（TOF） of 16.3 moles of hydrogen per mole of catalyst per hour at an overpotential（OP）of 941.6 mV（in DMF）,and a neutral buffer with a TOF of 1415.6 moles of hydrogen per mole of catalyst per hour at an OP of 787.6 mV. 展开更多
关键词 Copper complex Molecular structure Magnetic properties Electrocatalyst Proton or water reduction Hydrogen generation
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Top Ten Events in the Natural Gas Industry in China for 2024 认领 引用
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作者 Xu Bo Zhu Qiang 《China Oil & Gas》 CAS 2025年第2期53-58,共6页
In 2024,China’s natural gas industry continues to show a positive trend.In the field of exploration and development,a large ultra-deep water and ultra-shallow gas field has been discovered,further enhancing the uniqu... In 2024,China’s natural gas industry continues to show a positive trend.In the field of exploration and development,a large ultra-deep water and ultra-shallow gas field has been discovered,further enhancing the unique deep-water complex oil and gas exploration and development technology system independently developed by China.Remarkable achievements have been made in offshore development,including the commissioning of Deep Sea No.1 PhaseⅡ,the first deep-water high-pressure gas field.Additionally,the establishment of the Daji gas field,the first onshore coal rock gas field with an oil and gas equivalent of one million tons,provides strong support for domestic natural gas production.In terms of infrastructure construction,the entire China-Russia east-route natural gas pipeline has been completed,the Xinjiang section of the West Fourth Line is now operational,the Southern Xinjiang Gas Pipeline project has been fully launched,and five new or expanded LNG receiving terminals have been added,increasing the annual receiving capacity by 21.10 million tons.In the field of related equipment manufacturing,China successfully delivered the first vessel of its largest LNG transportation ship construction project,the Greenergy Ocean,and successfully launched its first large-scale floating natural gas liquefaction facility,the NGUYA FLNG.In terms of market supply and demand,natural gas consumption exceeded 400 billion m3 for the first time,with apparent consumption reaching 412.43 billion m3,an increase of 24.9 billion m3 year-on-year,reflecting a growth rate of 6.4%.The total supply reached 424.3 billion m3,an increase of 27.5 billion m3 year-on-year,with a growth rate of 7.5%.In terms of regulatory policy,China has once again issued a natural gas utilization policy aimed at further guiding the orderly and efficient development of the natural gas market. 展开更多
关键词 natural gas exploration development offshore developmentincluding ultra shallow gas field deep water complex oil gas exploration ultra deep water offshore development exploration developmenta
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Avian influenza virus ecology in wild birds of Western Siberia 认领 引用 被引量：1
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作者 K.A.Sharshov A.K.Yurlov +7 位作者 Xinxin Li Wen Wang Laixing Li Yuhai Bi Wenjun Liu Takehiko Saito Haruko Ogawa A.M.Shestopalov 《Avian Research》 SCIE CSCD 2017年第2期110-114,共5页
Background:The aim of the study was to explore the ecological diversity of wild birds in Siberia, which are the natural reservoir of avian influenza virus(AIV).Methods:Cloacal swabs and intestinal fragments were colle... Background:The aim of the study was to explore the ecological diversity of wild birds in Siberia, which are the natural reservoir of avian influenza virus(AIV).Methods:Cloacal swabs and intestinal fragments were collected from wild migratory birds from 2007-2014. Isolated viruses were grown in the allantoic cavity of embryonated chicken eggs. The presence of virus was determined using hemagglutination assays. Primary identification and subtyping of influenza viruses was confirmed by RT-PCR.Results:A total of 2300 samples obtained from wild migratory birds of 8 orders were collected and tested. Influenza was detected in 185 birds of 3 orders. Species of family Anatidae(order Anseriformes) such as European Teal(Anas crecca), Garganey Teal(A. querquedula), and Shoveler(A. clypeata) play the main role in AIV circulation in the south of Western Siberia. The proportion of viral carriers among waterfowl ranged from 5.6 to 20% in 2007-2014. The order Charadriiformes had lower virus isolation rates of not more than 1.4%.Conclusions:Wild migratory waterfowl of orders Anseriformes and Charadriiformes are the main reservoir of AIV in the south of Western Siberia. This area plays a key role in persistence, evolution, and geographical distribution of avian influenza. 展开更多
关键词 Influenza A virus Wild birds Water and wetland complex Ecology Migration Distribution Surveillance
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A water-soluble photolabile ruthenium(Ⅱ)complex with a terpyridyl-dicarboxylate ligand:photocytotoxicity triggered by structural strain 认领 引用
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作者 Pritha Chatterjee Madhu Verma +4 位作者 Avinash Kumar Sonkar Abhijit Saha Ramranjan Mishra Sri Sivakumar Ashis K.Patr 《Inorganic Chemistry Frontiers》 SCIE EI CAS CSCD 2025年第24期8288-8303,共16页
Structural distortions from the ideal octahedral geometry are known to facilitate the photorelease of kinetically inert groups in Ru(II)polypyridyl complexes.Building on this principle,here we report,for the first ... Structural distortions from the ideal octahedral geometry are known to facilitate the photorelease of kinetically inert groups in Ru(II)polypyridyl complexes.Building on this principle,here we report,for the first time,the design of a water-soluble Ru(II)complex containing a terpyridine-dicarboxylate pentadentate ligand(LH2),formulated as[Ru{ptpy(COO-)2}(DMSO)](RuL),engineered for efficient photorelease of the bound monodentate DMSO ligand in aqueous medium.This work presents a novel idea for inducing axial Ru-DMSO bond photolability from the conformational strain originating from a pentadentate ligand in an Ru(II)complex,triggering photodissociation to create potent cytotoxic species for phototherapeutic application.The molecular identity,and photophysical and electrochemical features with solution speciation of the RuL were examined.The blue-light-triggered photo-substitution was studied to gain insight into potential adduct formation with biological targets relevant to photo-activated chemotherapeutic(PACT)uses.The geometry-optimized structure and the nature of the frontier molecular orbitals have been determined using DFT calculations.The photosubstitution quantum yield(ΦPS)in acetonitrile was thirteen times greater than that in water,highlighting the significant influence of solvent on the photochemical efficiency.Notably,the RuL ligand exhibited substantial cytotoxicity under light irradiation,while remaining non-cytotoxic in the dark,underscoring its potential utility in Ru(II)-based photo-activated chemotherapy. 展开更多
关键词 terpyridyl dicarboxylate ligand photocytotoxicity water soluble photolabile ruthenium ii complex structural distortions bound monodentate dmso ligand photorelease structural strain kinetically inert groups
Many-body Interaction in 1,2,3-Triazine-(water)3 Complex 认领 引用 被引量：9
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作者 李权 黄方千 《Chinese Journal of Chemistry》 SCIE CAS 2005年第10期1314-1318,共5页
The interaction between 1,2,3-triazine and three water molecules was studied using density functional theory B3LYP method at 6-31-t＋＋G^＊＊ basis set. Various structures for 1,2,3-triazine-（water）n （n= 1, 2, 3） ... The interaction between 1,2,3-triazine and three water molecules was studied using density functional theory B3LYP method at 6-31-t＋＋G^＊＊ basis set. Various structures for 1,2,3-triazine-（water）n （n= 1, 2, 3） complex were investigated and the different lower energy structures were reported. Many-body analysis was also carded out to obtain relaxation energy and many-body interaction energy （two, three, and four-body）, and the most stable conformer has the basis set superposition error corrected interaction energy of -- 102.61 kJ/mol. The relaxation energy, two- and three-body interactions have significant contribution to the total interaction energy whereas four-body interaction was very small for 1,2,3-triazine-（water）3 complex. 展开更多
关键词 many-body interaction 1,2,3-tfiazine-（water）n complex density functional theory
RAY THEORY OF WATER WAVE REFRACTION ON COMPLEX TOPOGRAPHY 认领 引用
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作者 Chen Yao-song Cao Nian-zhemg Department of Mechanics,Peking University,Beijing,P.R.China 《Journal of Hydrodynamics》 SCIE 1989年第2期104-109,共6页
The caustic lines are formed as envelop lines of wave rays on the complex topo- graphy where conventional ray theory fails.By using the inner and outer scale method in the near region the caustic lines the singulariti... The caustic lines are formed as envelop lines of wave rays on the complex topo- graphy where conventional ray theory fails.By using the inner and outer scale method in the near region the caustic lines the singularities of the ray theory are dealt with.Using the conclusion that the phase of the ray in contact with the caustic line increases by π/2,the whole wave refraction problem is solvec except on caustic lines. 展开更多
关键词 line RAY THEORY OF WATER WAVE REFRACTION ON COMPLEX TOPOGRAPHY
Complex eigenvalues and group velocities of normal modes in shallow water with a lossy bottom 认领 引用
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作者 ZHANG Renhe and WANG Qin 《Chinese Journal of Acoustics》 EI 1991年第4期329-340,共12页
For the stratified shallow water with a lossy bottom, the distribution and asymptotic behavior of mode eigenvalues in the complex plane are discussed on the basis of the Pekeris cut. The analysis shows that even in th... For the stratified shallow water with a lossy bottom, the distribution and asymptotic behavior of mode eigenvalues in the complex plane are discussed on the basis of the Pekeris cut. The analysis shows that even in the shallow water with a low-speed lossy bottom there may be the proper modes which satisfy the radiation condition at infinite depth. It is also shown that when the ratio between the densities of the seawater and seabottom is close to one, there exist only a finite number of improper modes . An iterative method for evaluating the complex eigenvalues and group velocities of normal modes is presented and some numerical results are given. 展开更多
关键词 mode Complex eigenvalues and group velocities of normal modes in shallow water with a lossy bottom
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