In this paper, a primal-dual path-following interior-point algorithm for linearly constrained convex optimization(LCCO) is presented.The algorithm is based on a new technique for finding a class of search directions a...In this paper, a primal-dual path-following interior-point algorithm for linearly constrained convex optimization(LCCO) is presented.The algorithm is based on a new technique for finding a class of search directions and the strategy of the central path.At each iteration, only full-Newton steps are used.Finally, the favorable polynomial complexity bound for the algorithm with the small-update method is deserved, namely, O(√n log n /ε).展开更多
The engineering design of 60 kV, 55 A, 2 s bucket ion source for HL-2A has been finished. The current design is based on an extraction-acceldecel extraction system that is composed of plasma electrode, acceleration el...The engineering design of 60 kV, 55 A, 2 s bucket ion source for HL-2A has been finished. The current design is based on an extraction-acceldecel extraction system that is composed of plasma electrode, acceleration electrode, deceleration electrode and grounded electrode. The primary and secondary particles due to beams ionization in each region of extraction system will hit the surface of electrode. The power loads on an electrode is estimated both theoretically and experimentally to be 1%-2% of the ion beam power, which may cause serious problems, such as thermal deformation followed by ion beam distortion and melting leading to water leaks. To ensure the mechanical reliability and no plastic deformation, it is important and necessary to analysis the temperature and stress distribution.展开更多
The xonotlite fibers were synthesized via the hydrothermal synthesis method with CaO and SiO_2 as the raw materials and the molar ratio of Si/Ca of 1.0. Effect of anions from various calcium sources on the microstruct...The xonotlite fibers were synthesized via the hydrothermal synthesis method with CaO and SiO_2 as the raw materials and the molar ratio of Si/Ca of 1.0. Effect of anions from various calcium sources on the microstructure of the xonotlite fibers is studied in this paper. These obtained products were characterized by X-ray diffraction(XRD), transmission electron microscope(TEM) and scanning electron microscope(SEM) techniques to investigate their crystalline phase, crystal structure and morphology. The results indicate that anion from various calcium sources has little influence on the crystalline phases of xonotlite fibers but poses a great impact on their morphologies. Xonotlite fibers with single crystal characteristics and large aspect ratio of 50—100 were successfully fabricated from CaCl_2 as calcium material at 225 °C for 15 h. The existence of Cl-anion in the CaO-SiO_2-H_2O system significantly contributes to the formation of xonotlite crystal.展开更多
基金supported by the Shanghai Pujiang Program (Grant No.06PJ14039)the Science Foundation of Shanghai Municipal Commission of Education (Grant No.06NS031)
文摘In this paper, a primal-dual path-following interior-point algorithm for linearly constrained convex optimization(LCCO) is presented.The algorithm is based on a new technique for finding a class of search directions and the strategy of the central path.At each iteration, only full-Newton steps are used.Finally, the favorable polynomial complexity bound for the algorithm with the small-update method is deserved, namely, O(√n log n /ε).
文摘The engineering design of 60 kV, 55 A, 2 s bucket ion source for HL-2A has been finished. The current design is based on an extraction-acceldecel extraction system that is composed of plasma electrode, acceleration electrode, deceleration electrode and grounded electrode. The primary and secondary particles due to beams ionization in each region of extraction system will hit the surface of electrode. The power loads on an electrode is estimated both theoretically and experimentally to be 1%-2% of the ion beam power, which may cause serious problems, such as thermal deformation followed by ion beam distortion and melting leading to water leaks. To ensure the mechanical reliability and no plastic deformation, it is important and necessary to analysis the temperature and stress distribution.
基金supported by the National Natural Science Foundation of China(No.21666007)the Science Technology Foundation of Guizhou Province(No.2014-2007)the Program for “Hundred” High-Level Talents in Guizhou Province(No.2016-5655)
文摘The xonotlite fibers were synthesized via the hydrothermal synthesis method with CaO and SiO_2 as the raw materials and the molar ratio of Si/Ca of 1.0. Effect of anions from various calcium sources on the microstructure of the xonotlite fibers is studied in this paper. These obtained products were characterized by X-ray diffraction(XRD), transmission electron microscope(TEM) and scanning electron microscope(SEM) techniques to investigate their crystalline phase, crystal structure and morphology. The results indicate that anion from various calcium sources has little influence on the crystalline phases of xonotlite fibers but poses a great impact on their morphologies. Xonotlite fibers with single crystal characteristics and large aspect ratio of 50—100 were successfully fabricated from CaCl_2 as calcium material at 225 °C for 15 h. The existence of Cl-anion in the CaO-SiO_2-H_2O system significantly contributes to the formation of xonotlite crystal.
