Cardanol-aldehyde condensation polymer containing boron-nitrogen coordinate bond (CFBN) has been synthesized and characterized by IR, XPS, HPLC and DTA-TG. Its properties were also investigated. The results show tha...Cardanol-aldehyde condensation polymer containing boron-nitrogen coordinate bond (CFBN) has been synthesized and characterized by IR, XPS, HPLC and DTA-TG. Its properties were also investigated. The results show that the coating film of CFBN has excellent physico-mechanical properties, good anticorrosive properties and stable at high temperature. (Author abstract) 8 Refs.展开更多
The coordination polymer of copper electropolyurushiol(EPU-Cu^(2+)) was obtained by the reaction of copper chloride with electropolyurushiol (EPU) in an isopropyl alcohol solution. The properties of EPU-Cu^(2+) were s...The coordination polymer of copper electropolyurushiol(EPU-Cu^(2+)) was obtained by the reaction of copper chloride with electropolyurushiol (EPU) in an isopropyl alcohol solution. The properties of EPU-Cu^(2+) were studied by means of ESR, FTIR, XPS, DMTA and TG-DTA. The results of AES show that the content of Cu^(2+) was 8.63%. The electric resistances of EPU-Cu^(2+) and EPU were determined to be 9, 37×10^(10) Ω and 7.90×10^(10) Ω respectively. It was also ascertained that in EPU-Cu^(2+) each Cu^(2+) is coordinated with two units hydroxyl in EPU, making the EPU-Cu^(2+) cross-link further. As a result, the title polymer exhibits an insolubility in most of organic solutions, a higher glass transition temperature and thermal resistance.展开更多
An equivalent particle size distribution function n(r)is applied to describe optical scattering property of tissue.Under the Fraunhofer diffraction approximation,both the scattering coefficientμs and the scattering p...An equivalent particle size distribution function n(r)is applied to describe optical scattering property of tissue.Under the Fraunhofer diffraction approximation,both the scattering coefficientμs and the scattering phase function S(θ)are educible from n(r).Moreover,such a scheme provides a new feasible method based on the light scattering techniques for particle size analysis to measure the optical properties of tissue.Experimental results of the whole human blood and a thin porcine muscle sample are also provided and so is a calculation resulting from an optical phantom of tissue.The light scattering equivalency between the practical tissue and the corresponding equivalent particles has been verified.展开更多
Ⅰ. STATE OF THE STUDY ON EUSTATIC FLUCTUATIONS This paper is a brief review of the study of eustatic fluctuations of the Fujian Coast since 1931. As early as 1912, Richthofen believed that emergence
Carbonate eolianites in Houshijing, Putian, Fujian, consist of three sand ridges. The geometry and sedimentary structures of these ridges are described here, and their paleodune types and the paleowind directions are ...Carbonate eolianites in Houshijing, Putian, Fujian, consist of three sand ridges. The geometry and sedimentary structures of these ridges are described here, and their paleodune types and the paleowind directions are reconstructed on the basis of discussion of genesis. The authors consider that they were vegetated longitudinal dunes or sand drifts and wind shadow dunes or sand shadows which were formed by reworking of adjacent beach sand by prevailing northeast monsoon during the latest Middle Holocene. The wind directions in the past and at present do not appear to have obviously changed.展开更多
On the basis of Ref. [1] entitled "Carbonate eolianites in Putian, Fujian (Ⅰ)——Sedimentary structures and paleowinds", the sediment composition, sedimentary textures and diagenesis of the quartz-calcareni...On the basis of Ref. [1] entitled "Carbonate eolianites in Putian, Fujian (Ⅰ)——Sedimentary structures and paleowinds", the sediment composition, sedimentary textures and diagenesis of the quartz-calcarenites in Houshijing, Putian, Fujian are described here and compared with those of adjacent modern dune and beach sands, and their genesis and sources of sediment are discussed further. The authors consider that they are carbonate eolianites which were formed by coastal dune sand derived from reworking of adjacent beach sand by prevailing northeast monsoon winds and then cemented by freshwater subaerially during the end of the Middle Holocene.展开更多
There are many researchers discussing the problem of limit cycle of plane differential system of n degrees (E)_n with the integral curves of quadratic algebras. The mathematical model to express the living relation be...There are many researchers discussing the problem of limit cycle of plane differential system of n degrees (E)_n with the integral curves of quadratic algebras. The mathematical model to express the living relation between two species described in the field展开更多
It is a long standing open question in operator theory whether every Riesz operator on a general Banach space has the so-called West decomposition, i. e. whether it splits as the sum of a compact operator and a quasin...It is a long standing open question in operator theory whether every Riesz operator on a general Banach space has the so-called West decomposition, i. e. whether it splits as the sum of a compact operator and a quasinilpotent one. Recently, K.R.展开更多
B. Sz-Nagy and C. Foias introduced the concept of quasisimilarity in 1967. Since then, the quasisimilarity of operators has become an important research problem in the theory of operators and a lot of attractive resul...B. Sz-Nagy and C. Foias introduced the concept of quasisimilarity in 1967. Since then, the quasisimilarity of operators has become an important research problem in the theory of operators and a lot of attractive results have been obtained. But, as regards intersection relations between some subsets of the spectrum σ(A)and those of the spectrum σ(B), where A and B are quasisimilar operators, comparatively few results have been delivered.展开更多
Let A and B be quasisimilar operators. We describe refinedly the intersection relationsof the components of various essential spectra of A with various subsets of the essentialspectrum of B, and give an affirmative an...Let A and B be quasisimilar operators. We describe refinedly the intersection relationsof the components of various essential spectra of A with various subsets of the essentialspectrum of B, and give an affirmative answer to a question posed by L. A. Fialkow.展开更多
基金This work is supported by the National Science Foundation of China.
文摘Cardanol-aldehyde condensation polymer containing boron-nitrogen coordinate bond (CFBN) has been synthesized and characterized by IR, XPS, HPLC and DTA-TG. Its properties were also investigated. The results show that the coating film of CFBN has excellent physico-mechanical properties, good anticorrosive properties and stable at high temperature. (Author abstract) 8 Refs.
基金Supported by the National Natural Science Foundation of China.
文摘The coordination polymer of copper electropolyurushiol(EPU-Cu^(2+)) was obtained by the reaction of copper chloride with electropolyurushiol (EPU) in an isopropyl alcohol solution. The properties of EPU-Cu^(2+) were studied by means of ESR, FTIR, XPS, DMTA and TG-DTA. The results of AES show that the content of Cu^(2+) was 8.63%. The electric resistances of EPU-Cu^(2+) and EPU were determined to be 9, 37×10^(10) Ω and 7.90×10^(10) Ω respectively. It was also ascertained that in EPU-Cu^(2+) each Cu^(2+) is coordinated with two units hydroxyl in EPU, making the EPU-Cu^(2+) cross-link further. As a result, the title polymer exhibits an insolubility in most of organic solutions, a higher glass transition temperature and thermal resistance.
基金Supported by the Opening Project of the State Key Laboratory of Modern Optical Instrumentation,Zhejiang University under Grant No.LMOI-9808the National Natural Science Foundation of China under Grant No.69778029.
文摘An equivalent particle size distribution function n(r)is applied to describe optical scattering property of tissue.Under the Fraunhofer diffraction approximation,both the scattering coefficientμs and the scattering phase function S(θ)are educible from n(r).Moreover,such a scheme provides a new feasible method based on the light scattering techniques for particle size analysis to measure the optical properties of tissue.Experimental results of the whole human blood and a thin porcine muscle sample are also provided and so is a calculation resulting from an optical phantom of tissue.The light scattering equivalency between the practical tissue and the corresponding equivalent particles has been verified.
文摘Ⅰ. STATE OF THE STUDY ON EUSTATIC FLUCTUATIONS This paper is a brief review of the study of eustatic fluctuations of the Fujian Coast since 1931. As early as 1912, Richthofen believed that emergence
基金Project supported by the National Natural Science Foundation of China.
文摘Carbonate eolianites in Houshijing, Putian, Fujian, consist of three sand ridges. The geometry and sedimentary structures of these ridges are described here, and their paleodune types and the paleowind directions are reconstructed on the basis of discussion of genesis. The authors consider that they were vegetated longitudinal dunes or sand drifts and wind shadow dunes or sand shadows which were formed by reworking of adjacent beach sand by prevailing northeast monsoon during the latest Middle Holocene. The wind directions in the past and at present do not appear to have obviously changed.
基金Project supported by both the National Natural Science Foundation of China and Academia Sinica.
文摘On the basis of Ref. [1] entitled "Carbonate eolianites in Putian, Fujian (Ⅰ)——Sedimentary structures and paleowinds", the sediment composition, sedimentary textures and diagenesis of the quartz-calcarenites in Houshijing, Putian, Fujian are described here and compared with those of adjacent modern dune and beach sands, and their genesis and sources of sediment are discussed further. The authors consider that they are carbonate eolianites which were formed by coastal dune sand derived from reworking of adjacent beach sand by prevailing northeast monsoon winds and then cemented by freshwater subaerially during the end of the Middle Holocene.
文摘There are many researchers discussing the problem of limit cycle of plane differential system of n degrees (E)_n with the integral curves of quadratic algebras. The mathematical model to express the living relation between two species described in the field
文摘It is a long standing open question in operator theory whether every Riesz operator on a general Banach space has the so-called West decomposition, i. e. whether it splits as the sum of a compact operator and a quasinilpotent one. Recently, K.R.
文摘B. Sz-Nagy and C. Foias introduced the concept of quasisimilarity in 1967. Since then, the quasisimilarity of operators has become an important research problem in the theory of operators and a lot of attractive results have been obtained. But, as regards intersection relations between some subsets of the spectrum σ(A)and those of the spectrum σ(B), where A and B are quasisimilar operators, comparatively few results have been delivered.
基金Project supported by a grant from the Fujian Province Natural Science Foundation.
文摘Let A and B be quasisimilar operators. We describe refinedly the intersection relationsof the components of various essential spectra of A with various subsets of the essentialspectrum of B, and give an affirmative answer to a question posed by L. A. Fialkow.
