Institutional Repository of Institute of Modern Physics, CAS
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复合微生物菌剂袋装发酵甜高粱渣对奶牛产奶量及奶成分的影响
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">从奶牛群中挑选体质量、胎次、泌乳期、产奶量及采食量均相近的奶牛16头,试验组8头,对照组8头,进行发酵甜高粱渣生物饲料对奶牛产奶量和牛奶质量影响的评价研究.结果表明:复合菌剂发酵组饲料粗蛋白含量比空白对照组提高了71%,粗纤维含量比对照组降低了8%;复合微生物菌剂袋装发酵甜高粱渣生物饲料试验组提高了奶牛采食量和产奶量,试验组奶牛与青贮玉米秸秆组奶牛相比,采食量提高了11.4%,产奶量提高了14.2%,试验组的奶料比和对照组相比减低了20.8%.此外,试验组与对照组相比牛奶中的乳蛋白含量提高了14.03%;牛奶中的乳脂率含量提高了16.3%,试验组牛奶体细胞数与对照组相比下降了5.15%.</span><span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">Sixteen cows were selected from the dairy herd of similar weight,parity,lactation,milk pro-duction and feed intake,8 for experimental group,8 for the control group.The effects of the sweet sorghum straw fermented by the compound microbial agent on the milk yield and milk composition of the cows were researched.Results showed that the fermented sweet sorghum straw increased the content of crude pro-tein,with 7 1% higher compared the control,and the content of FIB reduced by 8%.Fermented sweet sor-ghum straw increased the feed intake (11.4%)and milk yield (14.2%),and the milk-feed ratio in the ex-perimental group decreased by 20.8%.In addition,the milk protein and milk fat content in experimental group increased by 14.03% and 16.3%.Milk somatic cell count decreased by 5.15%.</span
The study towards high intensity high charge state laser ion sources
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">As one of the candidate ion sources for a planned project, the High Intensity heavy-ion Accelerator Facility, a laser ion source has been being intensively studied at the Institute of Modern Physics in the past two years. The charge state distributions of ions produced by irradiating a pulsed 3 J/8 ns Nd:YAG laser on solid targets of a wide range of elements (C, Al, Ti, Ni, Ag, Ta, and Pb) were measured with an electrostatic ion analyzer spectrometer, which indicates that highly charged ions could be generated from low-to-medium mass elements with the present laser system, while the charge state distributions for high mass elements were relatively low. The shot-to-shot stability of ion pulses was monitored with a Faraday cup for carbon target. The fluctuations within +/- 2.5% for the peak current and total charge and +/- 6% for pulse duration were demonstrated with the present setup of the laser ion source, the suppression of which is still possible. (C) 2013 AIP Publishing LLC.</span
Survey network design of synchrotron in Heavy Ion Medical Machine in Lanzhou
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The paper introduces control survey network of installation strategy in the new HIMM (Heavy Ion Medical Machine). The 3D survey network is based on laser tracker and SA (Spatial Analyzer). Nine fiducial references and two scale bars were designed to guarantee high accuracy in control survey network. and Digital Level was used for altitude. The final RMS error of the global network could reach 0.04 mm, which guarantees the transverse position of quadrupoles requirement (0.10 mm) on the synchrotron.</span
Probing nuclear symmetry energy at high densities using pion, kaon, eta and photon productions in heavy-ion collisions
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The high-density behavior of nuclear symmetry energy is among the most uncertain properties of dense neutron-rich matter. Its accurate determination has significant ramifications in understanding not only the reaction dynamics of heavy-ion reactions, especially those induced by radioactive beams, but also many interesting phenomena in astrophysics, such as the explosion mechanism of supernova and the properties of neutron stars. The heavy-ion physics community has devoted much effort during the last few years to constrain the high-density symmetry using various probes. In particular, the pi(-)/pi(+) ratio has been most extensively studied both theoretically and experimentally. All models have consistently predicted qualitatively that the pi(-)/pi(+) ratio is a sensitive probe of the high-density symmetry energy especially with beam energies near the pion production threshold. However, the predicted values of the pi(-)/pi(+) ratio are still quite model dependent mostly because of the complexity of modeling pion production and reabsorption dynamics in heavy-ion collisions, leading to currently still controversial conclusions regarding the high-density behavior of nuclear symmetry energy from comparing various model calculations with available experimental data. As more pi(-)/pi(+) data become available and a deeper understanding about the pion dynamics in heavy-ion reactions is obtained, more penetrating probes, such as the K+/K-0 ratio, eta meson and high-energy photons are also being investigated or planned at several facilities. Here, we review some of our recent contributions to the community effort of constraining the high-density behavior of nuclear symmetry energy in heavy-ion collisions. In addition, the status of some worldwide experiments for studying the high-density symmetry energy, including the HIRFL-CSR external target experiment (CEE) are briefly introduced.</span
Dynamics of the fully stripped ion-hydrogen atom charge exchange process in dense quantum plasmas
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The plasma screening effects of dense quantum plasmas on charge exchange processes of a fully stripped ion colliding with a hydrogen atom are studied by the classical trajectory Monte Carlo method. The inter-particle interactions are described by the exponential cosine-screened Coulomb potentials. It is found that in weak screening conditions, cross sections increase with the increase of the ionic charge Z. However, in strong screening conditions, the dependence of cross sections on the ionic charge is related to the incident particle energy. At high energies, cross sections show a linear increase with the increase of Z, whereas at low energies, cross sections for Z >= 4 become approximately the same. The He2+ and C6+ impacting charge exchange cross sections in dense quantum plasmas are also compared with those in weakly coupled plasmas. The interactions are described by the static screened Coulomb potential. It is found that for both He2+ and C6+, the oscillatory screening effects of dense quantum plasmas are almost negligible in weak screening conditions. However, in strong screening conditions, the oscillatory screening effects enhance the screening effects of dense quantum plasmas, and the enhancement becomes more and more significant with the increase of the screening parameter and the ionic charge. (C) 2014 AIP Publishing LLC.</span
X-ray spectrum emitted by the impact of 129Xe26+ of the different kinetic energies on Au surface
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The characteristic X-ray spectra produced by the impact of Xe-129(26+) with kinetic energies from 350 to 600 keV and from 1.8 to 3.9 MeV on Au surface are measured. It is found that Xe-129(26+) with kinetic energies from 350 to 600 keV can excite only the characteristic X-ray spectra of M alpha of Au, but Xe-129(26+) with kinetic energies from 1.8 to 3.9 MeV can excite the characteristic X-ray spectra of M zeta, M alpha, M gamma and M delta. The relation between the characteristic X-ray intensity, the ratio of X-ray yield and the ion kinetic energy is analyzed. The kinetic energy threshold of L-X-ray of Xe emitted by Xe26+ is estimated.</span
Effects of multiple ionization on total L X-ray emission by proton impact
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The effects of multiple ionization on L X-ray emission by proton with energy from 100 keV to 250 keV on iron target was studied. The total L X-ray production cross sections were measured. A multiple ionization model and an average fluorescence yield were used together. The theoretical predictions with the correction of atomic parameter were obtained.</span