The Compact Pulsed Hadron Source （CPHS） project is a university-based proton accelerator platform （13 MeV,16 kW,50 mA peak current,0.5 ms pulse width at 50 Hz） for multi-disciplinary neutron and proton application...The Compact Pulsed Hadron Source （CPHS） project is a university-based proton accelerator platform （13 MeV,16 kW,50 mA peak current,0.5 ms pulse width at 50 Hz） for multi-disciplinary neutron and proton applications.The CPHS linac consists of a 3 MeV radio-frequency quadrupole （RFQ） linac and a 13 MeV drift tube linac （DTL）.Both the RFQ and DTL share a 325 MHz,2.1 MW klystron source.A single iris-type radio-frequency （RF） coupler is used to feed 537 kW of RF power to the RFQ cavity.Three-dimensional electromagnetic models of the ridge-loaded tapered waveguide （RLWG） and the coupler-cavity system are presented,and the design process and results of the RLWG and iris plate are described in detail.展开更多
The essay makes comprehensive literature review and analysis on various scientific experiments and research about the role of age in second language learning. Moreover, the introduction and analysis of"Critical P...The essay makes comprehensive literature review and analysis on various scientific experiments and research about the role of age in second language learning. Moreover, the introduction and analysis of"Critical Period Hypothesis"and its relevant research in second language acquisition has been presented in order to put forward some scientific implications for second lan guage learning and instruciton in the context of China.展开更多
This paper analyzes the requirements of multipoint multimedia services and the capability of IN CS-1/CS-2 to support multipoint services, and then presents a new E-CPH model supporting cooperative work and discusses t...This paper analyzes the requirements of multipoint multimedia services and the capability of IN CS-1/CS-2 to support multipoint services, and then presents a new E-CPH model supporting cooperative work and discusses the relations between this model and other CPH methods and the effects in consequence of IN architecture and service interaction. The basic theory of CPH methods such as LM, CC and their representations are also described.展开更多
文摘The Compact Pulsed Hadron Source （CPHS） project is a university-based proton accelerator platform （13 MeV,16 kW,50 mA peak current,0.5 ms pulse width at 50 Hz） for multi-disciplinary neutron and proton applications.The CPHS linac consists of a 3 MeV radio-frequency quadrupole （RFQ） linac and a 13 MeV drift tube linac （DTL）.Both the RFQ and DTL share a 325 MHz,2.1 MW klystron source.A single iris-type radio-frequency （RF） coupler is used to feed 537 kW of RF power to the RFQ cavity.Three-dimensional electromagnetic models of the ridge-loaded tapered waveguide （RLWG） and the coupler-cavity system are presented,and the design process and results of the RLWG and iris plate are described in detail.
文摘The essay makes comprehensive literature review and analysis on various scientific experiments and research about the role of age in second language learning. Moreover, the introduction and analysis of"Critical Period Hypothesis"and its relevant research in second language acquisition has been presented in order to put forward some scientific implications for second lan guage learning and instruciton in the context of China.
基金Supported by the Doctoral Foundation of National Education CommissionThe High Technology Research and Development Programme of China
文摘This paper analyzes the requirements of multipoint multimedia services and the capability of IN CS-1/CS-2 to support multipoint services, and then presents a new E-CPH model supporting cooperative work and discusses the relations between this model and other CPH methods and the effects in consequence of IN architecture and service interaction. The basic theory of CPH methods such as LM, CC and their representations are also described.
