The paper presented a new regular pattern （network structure ） of great earthquakes occurred in China's Mainland during the past 700 years, which may be helpful to improve the understanding of great earthquakes ...The paper presented a new regular pattern （network structure ） of great earthquakes occurred in China's Mainland during the past 700 years, which may be helpful to improve the understanding of great earthquakes and can serve as a base for the study of prediction of future great earthquakes. It can be done because there are quite complete and confident records of historical and recent earthquakes in a wide extent in China.展开更多
Through different preparation technology, this paper reports that the needle coke is prepared with coal-tar pitch under the effect of magnetic field and ultrasonic cavitation. It studies the effect of physical disturb...Through different preparation technology, this paper reports that the needle coke is prepared with coal-tar pitch under the effect of magnetic field and ultrasonic cavitation. It studies the effect of physical disturbance on the structure of needle coke. The structure of needle coke is characterized by scanning electron microscope and x-ray diffractometer, and the influence mechanism is analysed. Results showed that the structure and property of needle coke could be effectively improved by magnetic field and ultrasonic cavitations, such as degree of order, degree of graphitization and crystallization. Comparatively speaking, the effect of magnetic field was greater. The graphitization degree of needle coke prepared under the effect of magnetic field is up to 45.35%.展开更多
Ordering based search methods have advantages over graph based search methods for structure learning of Bayesian networks in terms on the efficiency. With the aim of further increasing the accuracy of ordering based s...Ordering based search methods have advantages over graph based search methods for structure learning of Bayesian networks in terms on the efficiency. With the aim of further increasing the accuracy of ordering based search methods, we first propose to increase the search space, which can facilitate escaping from the local optima. We present our search operators with majorizations, which are easy to implement. Experiments show that the proposed algorithm can obtain significantly more accurate results. With regard to the problem of the decrease on efficiency due to the increase of the search space, we then propose to add path priors as constraints into the swap process. We analyze the coefficient which may influence the performance of the proposed algorithm, the experiments show that the constraints can enhance the efficiency greatly, while has little effect on the accuracy. The final experiments show that, compared to other competitive methods, the proposed algorithm can find better solutions while holding high efficiency at the same time on both synthetic and real data sets.展开更多
The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing...The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing at various temperatures. Results show that the Fe/Pt multilayer structure can effectively reduce the ordering temperature of FePt film, and the in-plane coercivity of [Fe （5.2 nm）/Pt （5.2 nm）]7 multilayers can reach 161.2 kA/m after annealed at 350℃ for 30 min. When Fe and Pt layer thickness is equal, the coercivity of the film is the largest. On the other hand, the different Fe-Pt crystalline phases such as Fe3Pt and FePt3 phases are formed after annealing when the thickness ratio of Fe/Pt deviates from 1 after annealing. When Fe and Pt have the same thickness, the thinner single layer gets the lower ordering temperature and the larger coercivity.展开更多
Hollow multishelled structure(HoMs)has drawn tremendous attention due to its abundant attractive properties and promising applications.However,for a long time,the limited synthesis method hindered the development of H...Hollow multishelled structure(HoMs)has drawn tremendous attention due to its abundant attractive properties and promising applications.However,for a long time,the limited synthesis method hindered the development of HoMs.The sequential templating approach developed by our group,has greatly enriched its composition and'structure diversity.The progress in HoMS synthesis promotes the discovery of its characteristics as well as widens its application area.Typicall,the recently explored temporal-spatial ordering characteristic of HoMS has shown great promise in drug delivery and cascade catalysis application areas.Here,we summarize the current development progress of HoMS in the aspects of both synthesis and application,with a focus discussion on how to shape its application performance by manipulating its composition and structure features.In addition,we discuss the current challenges and providethe future potentials holdingfor HoMs.展开更多
Ⅰ. INTRODUCTION Computer-assisted molecular design and synthetic planning is an important aspect in modern chemical research. To give assistance to chemical design, a computer should acquire the ability to recognize ...Ⅰ. INTRODUCTION Computer-assisted molecular design and synthetic planning is an important aspect in modern chemical research. To give assistance to chemical design, a computer should acquire the ability to recognize chemical structures, namely, the internal representation (adjacent matrix) and external representation (linear notation, 2-D or 3-D molecular graphics and struc-展开更多
Stability of grain structure,dislocation ordering and strengthening mechanisms of the naturally aged AlCu-Mg alloy after solution treatment are investigated by using optical microscope(OM),scanning electron microscope...Stability of grain structure,dislocation ordering and strengthening mechanisms of the naturally aged AlCu-Mg alloy after solution treatment are investigated by using optical microscope(OM),scanning electron microscope(SEM),electron back-scattered diffraction(EBSD),X-ray diffraction(XRD) and transmission electron microscope(TEM).Results show that {100}<001>,{100}<110>,{110}<110> and {110}<001>slip systems can be activated after solution treatment,which can promote the formation of {110}<001>Goss texture.The combination effect of T-Al_(20)Cu_(2) Mn_(3) phase and Goss-oriented grains with large Taylor factor makes the solution-treated alloys display excellent stability of grain structure.The enhanced yield strength of the alloy is ascribed to grain-refine strengthening,dispersed particles strengthening,dislocation strengthening and texture strengthening.The coarsening of the second phase is responsible for softening of the alloy after annealing at 400 ℃+solution treatment at 475 ℃.展开更多
The effects of Dy on the microstructure and magnetic properties of DyxCo50-xPt50 alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 ℃ contain only a single A 1 （fcc） phase, w...The effects of Dy on the microstructure and magnetic properties of DyxCo50-xPt50 alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 ℃ contain only a single A 1 （fcc） phase, while the alloys annealed at 675℃ consist of a hard-magnetic face-eentered-tetragonal （fct） phase and a magnetically soft face-centered-cube （fcc） phase. Maximum values for the coercivity and remanence ratio mr were achieved in DY0.4Co49.6Pt50 alloys annealed at 675 ℃ for 80 min. For the series of Dy Co50-xPt50 alloys annealed at 675 ℃ for 60 min, H decreases monotonically with increasing Dy concentration, but mr is first enhanced and then weakened,展开更多
The formation of cold rolling textures in FeCo, CuZn and Fe 3Al based alloys with B2 structure was analyzed using X ray diffraction technology. The difference of deformation textures obviously demonstrated the differe...The formation of cold rolling textures in FeCo, CuZn and Fe 3Al based alloys with B2 structure was analyzed using X ray diffraction technology. The difference of deformation textures obviously demonstrated the different behaviors of plastic deformation in the alloys. The boundary energy of anti phase domains has important influence on the crystallographic behaviors of B2 ordered alloys during deformation. The activation of slip systems on the ｛110｝ planes should be the main deformation mechanism in B2 ordered alloys. The mechanical twinning on ｛112｝ planes appeared frequently in CuZn alloy with lower boundary energy of anti phase domains, while a rather typical rolling texture like that in BCC metals was observed in Fe 3Al alloy with incomplete B2 structure, indicating that its boundary energy of anti phase domains does not have important influence on the deformation mechanism similar to BCC metals.展开更多
The nucleation and growth processes of the stoichiometric δ'-TiN_0.5 long-range ordered precipitates duringδ-TiN0.5 →δ'-TiN_0.5 ordering transformation were investigated by transmission electron inicroscop...The nucleation and growth processes of the stoichiometric δ'-TiN_0.5 long-range ordered precipitates duringδ-TiN0.5 →δ'-TiN_0.5 ordering transformation were investigated by transmission electron inicroscopy (TEM).The nucleation of the new δ'-TiN_0.5 phase is homogeneous in the matrix. In general, the nucleation andgrowth of the new δ'-TiN_0.5 phase proceed preferentially on the { 110)M lattice planes of parent δ-TiN_0. s. Theδ'-TiN_0.5 precipitates are always of lamellar features formed by combination of the three equivalent orientationdomains with their habit planes parallel to {11 0 }M planes.展开更多
基金The Central Level,Scientific Research Institutes for Basic R & D Special Fund Business (No.2060302)National Natural Science Foundation of China(No.40841016,No.40372131 and No.40702056)Old Experts Science Foundation of China Earthquake Administration(No.201039)
文摘The paper presented a new regular pattern （network structure ） of great earthquakes occurred in China's Mainland during the past 700 years, which may be helpful to improve the understanding of great earthquakes and can serve as a base for the study of prediction of future great earthquakes. It can be done because there are quite complete and confident records of historical and recent earthquakes in a wide extent in China.
基金Project supported by the National Natural Science Foundation of China (Grant No. 20843002)the Scientific and Technological Foundation of Shanxi Province of China (Grant No. 20080321065)
文摘Through different preparation technology, this paper reports that the needle coke is prepared with coal-tar pitch under the effect of magnetic field and ultrasonic cavitation. It studies the effect of physical disturbance on the structure of needle coke. The structure of needle coke is characterized by scanning electron microscope and x-ray diffractometer, and the influence mechanism is analysed. Results showed that the structure and property of needle coke could be effectively improved by magnetic field and ultrasonic cavitations, such as degree of order, degree of graphitization and crystallization. Comparatively speaking, the effect of magnetic field was greater. The graphitization degree of needle coke prepared under the effect of magnetic field is up to 45.35%.
基金supported by the National Natural Science Fundation of China(61573285)the Doctoral Fundation of China(2013ZC53037)
文摘Ordering based search methods have advantages over graph based search methods for structure learning of Bayesian networks in terms on the efficiency. With the aim of further increasing the accuracy of ordering based search methods, we first propose to increase the search space, which can facilitate escaping from the local optima. We present our search operators with majorizations, which are easy to implement. Experiments show that the proposed algorithm can obtain significantly more accurate results. With regard to the problem of the decrease on efficiency due to the increase of the search space, we then propose to add path priors as constraints into the swap process. We analyze the coefficient which may influence the performance of the proposed algorithm, the experiments show that the constraints can enhance the efficiency greatly, while has little effect on the accuracy. The final experiments show that, compared to other competitive methods, the proposed algorithm can find better solutions while holding high efficiency at the same time on both synthetic and real data sets.
基金supported by the National Natural Science Foundation of China(No.60571010)Natural Science Foundation of Hubei province.
文摘The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing at various temperatures. Results show that the Fe/Pt multilayer structure can effectively reduce the ordering temperature of FePt film, and the in-plane coercivity of [Fe （5.2 nm）/Pt （5.2 nm）]7 multilayers can reach 161.2 kA/m after annealed at 350℃ for 30 min. When Fe and Pt layer thickness is equal, the coercivity of the film is the largest. On the other hand, the different Fe-Pt crystalline phases such as Fe3Pt and FePt3 phases are formed after annealing when the thickness ratio of Fe/Pt deviates from 1 after annealing. When Fe and Pt have the same thickness, the thinner single layer gets the lower ordering temperature and the larger coercivity.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.21820102002,21931012,22111530178 and 51972305)the DNLCooperation Fund,CAS(DNL202020).
文摘Hollow multishelled structure(HoMs)has drawn tremendous attention due to its abundant attractive properties and promising applications.However,for a long time,the limited synthesis method hindered the development of HoMs.The sequential templating approach developed by our group,has greatly enriched its composition and'structure diversity.The progress in HoMS synthesis promotes the discovery of its characteristics as well as widens its application area.Typicall,the recently explored temporal-spatial ordering characteristic of HoMS has shown great promise in drug delivery and cascade catalysis application areas.Here,we summarize the current development progress of HoMS in the aspects of both synthesis and application,with a focus discussion on how to shape its application performance by manipulating its composition and structure features.In addition,we discuss the current challenges and providethe future potentials holdingfor HoMs.
基金Project supported by the Structure Research Laboratory, University of Science and Technology of China, Academia Sinica
文摘Ⅰ. INTRODUCTION Computer-assisted molecular design and synthetic planning is an important aspect in modern chemical research. To give assistance to chemical design, a computer should acquire the ability to recognize chemical structures, namely, the internal representation (adjacent matrix) and external representation (linear notation, 2-D or 3-D molecular graphics and struc-
基金financially sponsored by the National Natural Science Foundation of China (No. 51171209)the National Key Research and Development Program of China (No. 2016YFB0300900)the National Key Fundamental Research Project of China (No.2012CB619506-3)。
文摘Stability of grain structure,dislocation ordering and strengthening mechanisms of the naturally aged AlCu-Mg alloy after solution treatment are investigated by using optical microscope(OM),scanning electron microscope(SEM),electron back-scattered diffraction(EBSD),X-ray diffraction(XRD) and transmission electron microscope(TEM).Results show that {100}<001>,{100}<110>,{110}<110> and {110}<001>slip systems can be activated after solution treatment,which can promote the formation of {110}<001>Goss texture.The combination effect of T-Al_(20)Cu_(2) Mn_(3) phase and Goss-oriented grains with large Taylor factor makes the solution-treated alloys display excellent stability of grain structure.The enhanced yield strength of the alloy is ascribed to grain-refine strengthening,dispersed particles strengthening,dislocation strengthening and texture strengthening.The coarsening of the second phase is responsible for softening of the alloy after annealing at 400 ℃+solution treatment at 475 ℃.
基金Funded by the National Natural Science Foundation of China(No.51261004&50661002)the National Science foundation of Guangxi Province(2012GXNSFGA060002)
文摘The effects of Dy on the microstructure and magnetic properties of DyxCo50-xPt50 alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 ℃ contain only a single A 1 （fcc） phase, while the alloys annealed at 675℃ consist of a hard-magnetic face-eentered-tetragonal （fct） phase and a magnetically soft face-centered-cube （fcc） phase. Maximum values for the coercivity and remanence ratio mr were achieved in DY0.4Co49.6Pt50 alloys annealed at 675 ℃ for 80 min. For the series of Dy Co50-xPt50 alloys annealed at 675 ℃ for 60 min, H decreases monotonically with increasing Dy concentration, but mr is first enhanced and then weakened,
文摘The formation of cold rolling textures in FeCo, CuZn and Fe 3Al based alloys with B2 structure was analyzed using X ray diffraction technology. The difference of deformation textures obviously demonstrated the different behaviors of plastic deformation in the alloys. The boundary energy of anti phase domains has important influence on the crystallographic behaviors of B2 ordered alloys during deformation. The activation of slip systems on the ｛110｝ planes should be the main deformation mechanism in B2 ordered alloys. The mechanical twinning on ｛112｝ planes appeared frequently in CuZn alloy with lower boundary energy of anti phase domains, while a rather typical rolling texture like that in BCC metals was observed in Fe 3Al alloy with incomplete B2 structure, indicating that its boundary energy of anti phase domains does not have important influence on the deformation mechanism similar to BCC metals.
文摘The nucleation and growth processes of the stoichiometric δ'-TiN_0.5 long-range ordered precipitates duringδ-TiN0.5 →δ'-TiN_0.5 ordering transformation were investigated by transmission electron inicroscopy (TEM).The nucleation of the new δ'-TiN_0.5 phase is homogeneous in the matrix. In general, the nucleation andgrowth of the new δ'-TiN_0.5 phase proceed preferentially on the { 110)M lattice planes of parent δ-TiN_0. s. Theδ'-TiN_0.5 precipitates are always of lamellar features formed by combination of the three equivalent orientationdomains with their habit planes parallel to {11 0 }M planes.
