The low energy particle detector （LEPD） is one of the main payloads onboard the China seismic electromagnetic satellite （CSES）. The detector is designed to ascertain space electrons （0.1–10 MeV） and protons （2...The low energy particle detector （LEPD） is one of the main payloads onboard the China seismic electromagnetic satellite （CSES）. The detector is designed to ascertain space electrons （0.1–10 MeV） and protons （2–50 MeV）. It has the capability of identifying the electrons and protons, to measure the energy spectrum and the incident angle of the particles. The LEPD is made up of a silicon tracker system, a CsI （Tl） mini-calorimeter, an anti-coincidence system made by plastic scintillator, as well as electronics and a data acquisition system （DAQ）. The tracker is also a kind of E-E telescope; it consists of two layers of double-sided silicon strip detectors （DSSD）. The signals emerging from the silicon tracker can be read out by two pieces of application specific integrated circuit （ASIC）, which also can generate an event trigger for the LEPD. The functions of the DSSD system in the LEPD for charged particles were tested by 241Am @5.486 MeV α particles. The results show that the DSSD system works well, and has high performance to detect charged particles and measure the position of incident particles.展开更多
An efficient NMR determination of the enantiomeric excess of the amino acids can be achieved using chloro-bridged dimer R- (+)-{Pd [(eta(5)-C5H5)Fe (eta(5)-C5H3CMe=NAr)] (mu-Cl)}2 (Ar=p-CH3C6H4) (R-1).
Ⅰ. INTRODUCTIONBecause Fe-Mn base alloys have Invar and Elinvar effects below the anti-magnetic transformation point T_N and because the alloys are free of precious elements, more atten-
Ⅰ. INTRODUCTION Because Fe-Mn base alloys have Invar and Elinvar effects below the antimagnetic transformation point T_N and because the alloys are free of precious elements, more attention has been paid to them in t...Ⅰ. INTRODUCTION Because Fe-Mn base alloys have Invar and Elinvar effects below the antimagnetic transformation point T_N and because the alloys are free of precious elements, more attention has been paid to them in the investigation of non-magnetic low expansion and nonmagnetic constant elastic alloys. In Ref. [3] the effect of cold deformation and展开更多
The valence electron structures and bond energy of M3C pattern carbides in white cast irons are calculated on the basis of Yu Ruihuang’s empirical electron theory of solids and molecules (E.E. T. ) by means of bond l...The valence electron structures and bond energy of M3C pattern carbides in white cast irons are calculated on the basis of Yu Ruihuang’s empirical electron theory of solids and molecules (E.E. T. ) by means of bond length difference method (BLD). Based on the results, a difference factor θ for measuring the difference between inner- and interlayer bond forces is proposed to study the influence of alloying elements Cr, Mn and W on the morphology of Fe3C during solidification.展开更多
基金Supported by China 863 High Technology Development Program "Study on identification and Quantitative Retriveval of the Lunar Surface Composition" (2010AA122203)
文摘The low energy particle detector （LEPD） is one of the main payloads onboard the China seismic electromagnetic satellite （CSES）. The detector is designed to ascertain space electrons （0.1–10 MeV） and protons （2–50 MeV）. It has the capability of identifying the electrons and protons, to measure the energy spectrum and the incident angle of the particles. The LEPD is made up of a silicon tracker system, a CsI （Tl） mini-calorimeter, an anti-coincidence system made by plastic scintillator, as well as electronics and a data acquisition system （DAQ）. The tracker is also a kind of E-E telescope; it consists of two layers of double-sided silicon strip detectors （DSSD）. The signals emerging from the silicon tracker can be read out by two pieces of application specific integrated circuit （ASIC）, which also can generate an event trigger for the LEPD. The functions of the DSSD system in the LEPD for charged particles were tested by 241Am @5.486 MeV α particles. The results show that the DSSD system works well, and has high performance to detect charged particles and measure the position of incident particles.
文摘An efficient NMR determination of the enantiomeric excess of the amino acids can be achieved using chloro-bridged dimer R- (+)-{Pd [(eta(5)-C5H5)Fe (eta(5)-C5H3CMe=NAr)] (mu-Cl)}2 (Ar=p-CH3C6H4) (R-1).
文摘Ⅰ. INTRODUCTIONBecause Fe-Mn base alloys have Invar and Elinvar effects below the anti-magnetic transformation point T_N and because the alloys are free of precious elements, more atten-
文摘Ⅰ. INTRODUCTION Because Fe-Mn base alloys have Invar and Elinvar effects below the antimagnetic transformation point T_N and because the alloys are free of precious elements, more attention has been paid to them in the investigation of non-magnetic low expansion and nonmagnetic constant elastic alloys. In Ref. [3] the effect of cold deformation and
文摘The valence electron structures and bond energy of M3C pattern carbides in white cast irons are calculated on the basis of Yu Ruihuang’s empirical electron theory of solids and molecules (E.E. T. ) by means of bond length difference method (BLD). Based on the results, a difference factor θ for measuring the difference between inner- and interlayer bond forces is proposed to study the influence of alloying elements Cr, Mn and W on the morphology of Fe3C during solidification.
