最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：C-N films were synthesized on high-resistance Si(111) substrates by cluster beam deposition method. Transmission infrared spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy were used to characterize the structure of the films. IR, Raman and XPS results indicated that there existed some amount of N-sp 3C bonds, but N-sp 2C and CC bonds were predominant in the films.关键词：Cluster deposition;C-N film;Structure
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发布时间：2021-03-12 - 摘要：SiO 2 glass specimens were irradiated with 1.15GeV Ar ions at room temperature. Positron lifetime spectroscopy was applied to investigate the radiation induced microscopic changes. It was found that for the unirradiated specimen about 81% positrons annihilate from positronium (Ps) states. Free volumes of about 2.5nm in radius and distributed from 0.02—0.13nm 3 are found from the o-Ps lifetime. Under irradiation the free volume distribution function narrows down and the peak position shifts to lower value, which indicate the densification of the material. With increasing dose, the intensity of the second lifetime component increases whereas the intensity of the component corresponding to o-Ps decreases. This was attributed to the prefered annihilation of positrons with the radiation-ionized electrons wandering in free volumes.关键词：SiO 2 glass;Ar ion irradiation;Positron lifetime;Microscopic structure
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发布时间：2021-03-12 - 摘要：The decay of 101 Tc to levels in 101 Ru has been studied using the three-parameter (γ-γ- t ) coincidence system of HpGe-HpGe detectors. From the coincidence data, a new decay scheme was constructed. The 174.91, 226.02, 312.40, 408.77 and 417.91keV gamma rays were observed for the first time and their transition scheme have been assigned, the transition position of 616.3keV gamma ray has been assigned at the same time. The intensities of β - decay and the values of log f t to most levels were calculated.关键词：Decay;Gamma ray;Level;Coincidence
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发布时间：2021-03-12 - 摘要：Based on the observation of the matter absorbed on the geogas collectors, elements in the crust can be transported to surface in the form of nano-scale particles by ascending gas flow. For further studies, a model experiment was designed in which the ascending gas flowed through ore stratum, ore stratum covered by overburden and country rock respectively. The matter transported by ascending gas flow under the experiment turned to be nano-scale particle and the matter on the collectors increased with the increasing time. Some elements could pass through the water layer and compact glass in the experiment. The result of the diffusion experiment demonstrates that the elements can be also transported by diffusion, but the amount is much less. The nano-scale particles photographs of the geogas matter under scanning electron microscopy are presented.关键词：Model experiment;Elements transportation;Scanning electron microscopy;Ascending gas flow;Nano-scale particles;INAA;Environment
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发布时间：2021-03-12 - 摘要：The mutation effect caused by low energy ion beam implantation into dry seeds has been accepted and turned into practical application. But its mechanism is still not clearly understood. According to the energetic ion range theory, ions with hundreds of keV energy can’ t directly affect the nuclei of the cell inside the embryo part of the seeds underneath the thick seed coat. It is obviously important to measure the concentration-depth distribution of the implanted ions in seeds for study of the mechanism. 200keV V + ions were implanted into dry seeds of peanut with a dose of 9×10 16 ions/cm 2, then the seeds were sliced up into 15μm thickness along the incident beam direction . The concentration of the V in each slice was measured with PIXE (Particle Induced X-ray Emission). It is shown that the concentrations of the V in un-implanted peanut are lower than the detection limit of PIXE. But the concentrations in the slices of implanted peanut up to 121—135μm depth are higher than the PIXE detection limit. More than 98% of V are in the first slice ( corresponding to 0—15μm depth), however, the rest part of V distribute over a wide depth range. This fact indicates that the structure in peanut seeds is not homogeneous, the implanted ions can reach a much deeper depth than that predicted by the range theory.关键词：PIXE;SEM;Seeds;Ion implantation;Concentration depth profile
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发布时间：2021-03-12 - 摘要：A scanning proton microprobe (SPM) with high resolution and high sensitivity is applied to analyze single particles from steel industry in Shanghai. The elemental distribution and the variation of mean concentration of different elements with particle sizes were studied. The results indicated that the distributions of elements such as Fe, Cr and Mn are uniform, but K and Ca were rich on the surface of the particles. Moreover, the variation of mean concentration of different elements with particle sizes had regular features. Some harmful elements, such as Cu, Cr, Ni, Zn, Pb were contained in particles with size less than 5μm.关键词：Particles of metallurgic industry;Scanning proton microprobe(SPM);Analysis of single particles
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发布时间：2021-03-12 - 摘要：A method to determine the thickness of the Si semiconductor detector and calibrate the CsI(Tl) was developed using the maximum energy loss of charged particles emitted in nuclear reactions and their stopping power in Si semiconductor.关键词：Energy calibration;CsI(Tl);Si-semiconductor detector
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发布时间：2021-03-12 - 摘要：A distributed control system, EPICS, was introduced in this paper. It’s general skeleton and the functions of its components were described in detail. The upgrade of HLS control system based on EPICS and it’s recent progress were also described.关键词：EPICS;Control system;Synchrotron radiation light source
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发布时间：2021-03-12 - 摘要：Based on a lerge amount of data in Radon-measuing, a formula has been put forward, with which the similarity between Radon-measuring data can be described, and the false abnormalities can be found in the Radon-measuring curves. At the same time, some similarity characteristics of the Radon data over different geological abnormalities have been shown.关键词：Radon-measuring data;Similarity;Radon abnormality
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发布时间：2021-03-12 - 摘要：Hemoglobin was the carrier of oxygen in blood circulation. For the patients with diabetes mellitus the enhencement of glycated hemoglobin in blood causes the decrease of oxygen transmission function. In this work, the local atomic structures of iron in hemoglobin were determined by EXAFS techniques. The relationship between diabetes mellitus and hemoglobin structures was observed. The blood samples were taken from normal people, slight and serious diabetic patients. The results show that the coordination number of iron atoms and Fe—O bond length were almost the same for the three samples. However, for the samples of serious diabetic patients the Fe—N bond length increases by about 0.002nm, the possible reasons were the increase of deoxyhemoglobin contents in their blood.关键词：Diabetes mellitus;Hemoglobin;Local atomic structure;EXAFS
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发布时间：2021-03-12 - 摘要：The purpose of this article is to determine physical and chemical properties of the iron oxide solution prepared in our laboratory and to evaluate the possibility for using it as a nuclear magnetic resonance contrast agent. The iron concentration and viscosity of the solution were found to be 0.15 mol/L and 0.00168 Pa·s, respectively, the particle size of the iron core was about 10nm determined with a transmission electronic telescope. The susceptibility increased with increasing iron concentration. The T2 signal intensity decreased by more than 50% at iron concentration of 0.1mmol/L, there was a peak of T1 signal intensity at iron concentration of 0.2—0.4mmol/L. No precipitate was observed in the solution after storing for one year. It was concluded good homogeneity and suspensibility of the iron solution were obtained. The significant decrease of T2 signal intensity with iron concentration shows that the solution was a promising contrast agent for magnetic resonance imaging.关键词：Iron oxide;Physical and chemical properties;Contrast agent for NMR
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发布时间：2021-03-12 - 摘要：In order to obtain a better understand of the characteristics and location of noise source, the leaked electromagnetic noise in the klystron corridor of NSRL has been analogously calculated. The computational method and formula of high frequency leaked noise of the modulator were given. On-the-spot contrast tests have been made on the base of analog computation. The contrast test results show reasonableness of analog computation and whereby offer a theoretic base for reducing noise leakage in corridor.关键词：Klystron;Electromagnetic noise;Contrast test
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发布时间：2021-03-12 - 摘要：This paper described a charge comparison method with CAMAC-PC DAQ to identify the (α、γ) signals in CsI(Tl) crystal and measure the intrinsic radioactivity of CsI(Tl). The concentrations of 238 U and 232 Th in CsI(Tl) have been estimated.关键词：Pulse shape discrimination;Charge comparison method;(α、γ) identify;Radioactivity of crystal CsI(Tl);Neutrino measurement
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发布时间：2021-03-12 - 摘要：The short-lived radioactive nuclide in rainwater were measured using general radioactive measurement instrument and studied in this paper. The experimental results indicate that there are short-lived radioactive nuclides in all kinds of rainwater. The result of gamma ray spectrum analysis shows that these short-lived radioactive nuclides are 218 Po, 214 Pb, 214 Bi and so on. The entry mechanism of these radioactive nuclides into rainwater are discussed. These radioactive nuclides enter rainwater during the course of vapor condenration and raindrop incorporating and scouring the air. These radioactive nuclides in rainwater have an effect on the radioactivity measurement such as ground gamma measurement, 210 Po measurement and so on.关键词：Rainfall;Radioactive nuclide;Half-life;210 Po measurement;Scour
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发布时间：2021-03-12 - 摘要：The purification of krypton and xenon from the helium carrier gas of high temperature gas-cooled reactor by fixed bed activate carbon adsorption is studied. Experimental data at different adsorptive temperature, concentration, flow rate and bed depth are obtained from isothermal adsorption tests in order to examine the effects of these parameters on adsorption dynamic and for the optimal parameters selection of adsorption process. The results show that krypton and xenon from the helium carrier gas in HTGR can be eliminated by the coconut putamina activated carbon to meet the demands of purification system.关键词：Adsorption;Activated carbon;Purification;Kr;Xe;High temperature gas-cooled reactor
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发布时间：2021-03-12 - 摘要：The problem about benefiting Cu-bearing gold ore by nonitoring the ore-dressing process with a portable XRF analyzer has been studied, and a method for monitoring the process has been developed. Applications have shown it can increase metal recovery greatly.
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发布时间：2021-03-12 - 摘要：The principal, development and application of the cold crucible technology in the treatment of radioactive wastes were reviewed. The importance of the cold crucible technique for solidification of radioactive waste was described.
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发布时间：2021-03-12
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