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Study on γ-Ray Irradiation Mutation of Bacillus subtilis NCD-2 被引量:1
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作者 刘桂君 孟佑婷 +2 位作者 杨素玲 包放 尚宏忠 《Agricultural Science & Technology》 CAS 2011年第11期1633-1636,1743,共5页
[Objective] To study the effect of 60Co γ-rays irradiation on Botrytis cinerea biocontrol strains—Bacillus subtilis NCD-2. [Method] NCD-2 cells were irradiated at different doses of γ-rays from 100 to 2 000 Gy. The... [Objective] To study the effect of 60Co γ-rays irradiation on Botrytis cinerea biocontrol strains—Bacillus subtilis NCD-2. [Method] NCD-2 cells were irradiated at different doses of γ-rays from 100 to 2 000 Gy. The strains were screened by plate confrontation method and Oxford cup diffusion. [Result] The curves of the relationship of irradiation dose and mutation and lethal rate were obtained. The results showed that lethal rate increased with the increasing of irradiation dose. The lethal rate of 1 000 Gy irradiation dose reached 99.50%. The mutation rate increased below 500 Gy and decreased above 500 Gy. The highest mutation rate occurred when the irradiation dose was between 400 and 700 Gy, and the average mutation rate was above 15%. The optimal irradiation dose was 500 Gy, when the average mutation rate was 26.51% and lethal rate was 77.71%. [Conclusion] This study provided references for γ-rays irradiation mutation of Bacillus subtilis. 展开更多
关键词 irradiation mutation γ-rays Lethal rate Mutation rate
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SRAP Marker Analysis of Genomic Mutation Induced by ^(60)Coγ-Ray Irradiation in Potato (Solanum tuberosum) 被引量:1
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作者 黄先群 刘子瑜 +5 位作者 黄团 唐章林 李丽 丁小令 林平 陈梦玉 《Agricultural Science & Technology》 CAS 2013年第8期1092-1098,共7页
[Objective] This study was to explore the mutagenic effect of 60Co γ-ray on Solanum tuberosum chromosomes.[Method] The 60Co γ-ray at different irradiation doses was applied to treat the minitubers of potato variety ... [Objective] This study was to explore the mutagenic effect of 60Co γ-ray on Solanum tuberosum chromosomes.[Method] The 60Co γ-ray at different irradiation doses was applied to treat the minitubers of potato variety 'Favorita',and the genomic mutations in VM1 and VM2 gene rations in treatments with different doses were analyzed by SRAP markers.[Resalt] Thirty pairs of SRAP primers out of 88 pairs exhibited polymorphism with a rate of 34.1% in the bulked selection of VM1 generation.A total of 225 bands were obtained,of which 64 were polymorphic with a rate of 28.4%.The polymorphism was reflected in the forms of deleted bands and added bands.Based on the result of the bulked selection of VM1 generation,25 primers with polymorphism were selected to scan VM2 generation.Five primers performed poorly,and nine of the rest 20 pairs revealed polymorphism and obtained nine polymorphic bands,of which only four bands were detected in VM1 generation and the other five ones were newly deleted bands.Only 9.8% of the bands detected in VM1 generation were obtained in VM2 generation.Eventually,nine stable and dear polymorphic bands were recovered and cloned,and DNA sequences of six bands of them were acquired by sequencing.According to the comparative analysis,five fragments sequences were similar to potato chromosome with a similarity rate of 77%-89%,three of them located at the resistance gene cluster; another one fragment had a similarity of 93% with some regions of the No.5 chromosome in tomato.[Conclusion] 60Co γ-ray irradiation can cause mutation of genomic DNA in potato;there is no significant correlation between the number of polymorphic bands and the irradiation dose; potymorphic bands are characterized by a larger number of deleted bands than that of the added ones. 展开更多
关键词 POTATO ^60Co γ-ray irradiation SRAP markers MUTATION
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γ-Ray Irradiation-Derived MnO/rGO Composites for High Performance Lithium Ion Batteries
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作者 郭亚丽 金洪昌 +2 位作者 杜真真 葛学武 季恒星 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2017年第4期461-466,I0002,共7页
We report a γ-ray irradiation reduction method to prepare MnO/reduced graphene oxide (rCO) nanocomposite for the anode of lithium ion batteries. γ-Ray irradiation provides a clean way to generate homogeneously dis... We report a γ-ray irradiation reduction method to prepare MnO/reduced graphene oxide (rCO) nanocomposite for the anode of lithium ion batteries. γ-Ray irradiation provides a clean way to generate homogeneously dispersed MnO nanoparticles with finely tuned size on rGO surface without the use of surfactant. The MnO/rGO composite enables a fully charge/discharge in 2 min to gain a reversible specific capacity of 546 (mA-h)/g which is 45 higher than the theoretical value of commercial graphite anode. 展开更多
关键词 γ-ray irradiation reduction MnO anode Reduced graphene oxide NANOCOMPOSITES Lithium ion batteries
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Preparation and Characterization of Fe3O4 Magnetic Nano-particles by ^(60)Co γ-ray Irradiation 被引量:2
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作者 Mingcheng YANG Hongyan SONG +2 位作者 Chengshen ZHU Suqin HE Ya GAO 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第2期182-184,共3页
By using a new method, ^60Co γ-ray irradiation, Fe3O4 magnetic nano-particles were successfully synthesized at room temperature under ambient pressure. The structure, morphology and magnetic properties of these nanop... By using a new method, ^60Co γ-ray irradiation, Fe3O4 magnetic nano-particles were successfully synthesized at room temperature under ambient pressure. The structure, morphology and magnetic properties of these nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and vibrating sample magnetometer (VSM), respectively. The radiation formation mechanism was also discussed. The results show that the absorbed dose can greatly influence the structure, morphology and magnetic properties of the products. XRD and TEM studies show that the product prepared by γ-ray irradiation (10 kGy) is pure FesO4 phase and the mean diameter of these nano-particles is about 21 nm. The Fe3O4 nano-particles synthesized by γ-ray irradiation (10 kGy) are mainly in small cubic shape and the size uniformity of these particles is good. 展开更多
关键词 ^60Co γ-ray irradiation Fe304 nano-particles Super-paramagnetism
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Effects of Gamma-Ray Irradiation on Dielectric Surface Breakdown of Polybutylene Naphthalate and Polybutylene Terephthalate Under Reduced Pressure 被引量:3
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作者 杜伯学 刘弘景 +1 位作者 刘勇 孟令飞 《Transactions of Tianjin University》 EI CAS 2007年第4期247-253,共7页
With the increasing application of electric and electronic devices in space and nuclear power stations, the polymeric insulation materials are inevitably exposed to various kinds of environments. Accordingly, it becom... With the increasing application of electric and electronic devices in space and nuclear power stations, the polymeric insulation materials are inevitably exposed to various kinds of environments. Accordingly, it becomes necessary to investigate the effects of the radiation and air pressure on insulation materials. This paper describes the effects of gamma-ray irradiation and reduced pressure on dielectric breakdown of polybutylene naphthalate (PBN) and polybutylene terephthalate (PBT) by applying a DC pulse voltage. Both PBN and PBT were irradiated in air up to 100 kGy and then up to 1 000 kGy with a dose rate of 10 kGy/h by using a60Co gamma-source. The effects of total dose and reduced pressure on the time to dielectric breakdown and discharge quantity were discussed. Obtained results show that, while increasing the total dose, the discharge quantity decreased with PBN, but increased with PBT. With decreasing the air pressure, the discharge quantity increased with PBN, but decreased with PBT. With increasing the total dose, the time to dielectric breakdown increased with PBN, but decreased with PBT. With decreasing the air pressure, the time to dielectric breakdown increased with both PBN and PBT. The experimental results suggest that the chemical structure of polybutylene polymers plays a main role in the result of radiation reaction, which is related to cross-linking and degradation reaction. 展开更多
关键词 polybutylene naphthalate (PBN) polybutylene terephthalate PBT) air pressure total dose gamma-ray irradiation discharge quantity dielectric breakdown cross-linking DEGRADATION
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Preparation of Thermal-responsive Chitosan-graft-N-isopropyl- acrylamide Membranes via γ-Ray Irradiation
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作者 Qing MU Yue E FANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第9期1236-1238,共3页
A novel thermo-sensitive switching membrane has been prepared by radiation-induced simultaneous grafting N-isopropylacrylamide (NIPAAm) onto chitosan membrane. Fourier transform infrared spectroscopy (FTIR) was us... A novel thermo-sensitive switching membrane has been prepared by radiation-induced simultaneous grafting N-isopropylacrylamide (NIPAAm) onto chitosan membrane. Fourier transform infrared spectroscopy (FTIR) was used to identify the structure of the grafted membranes. The surface morphology of the grafted membrane was observed from scanning electron microscopy (SEM). Pure water flux measurements showed that water flux of the grafted membrane decreased with the increase of temperature, while that of chitosan membrane was constant. It was proved that grafted membrane was sensitive to temperature. 展开更多
关键词 Chitosan membrane N-ISOPROPYLACRYLAMIDE γ-ray irradiation thermal-responsive.
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Novel Method of Preparation of Monolithic Columns for Fast Separation byγ-Ray Irradiation
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作者 Yu Ping ZHANG Wen Jun GONG +2 位作者 Li Qun FAN Yi Jun ZHANG Kwang Pill LEE 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第11期1485-1488,共4页
A porous monolithic sol-gel column with the solution of methacryloxypropyltrimethoxysilane in toluene with an acid catalyst was prepared in the presence and absence of sodium dodecyl sulfate. In situ polymerization wa... A porous monolithic sol-gel column with the solution of methacryloxypropyltrimethoxysilane in toluene with an acid catalyst was prepared in the presence and absence of sodium dodecyl sulfate. In situ polymerization was carded out by γ-ray irradiation within the capillary. The γ-radiation-initiated synthesis could generate radicals directly on the monomer avoiding use of any initiator. The chromatographic behavior of the capillary monolithic columns were studied in the modes of CEC, p-CEC and low pressure-driven separation, all the tests exhibited reversed-phase character. It provided a viable alternative to either thermally initiated or photo polymerization method for the preparation of monolithic columns. 展开更多
关键词 Monolithic columns ELECTROCHROMATOGRAPHY γ-ray irradiation polymerization.
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The effect ofγ-ray irradiation on the SOT magnetic films and Hall devices
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作者 Tengzhi Yang Yan Cui +6 位作者 Yanru Li Meiyin Yang Jing Xu Huiming He Shiyu Wang Jing Zhang Jun Luo 《Journal of Semiconductors》 EI CAS CSCD 2021年第2期108-112,共5页
Magnetoresistive random access memories(MRAMs)have drawn the attention of radiation researchers due to their potential high radiation tolerance.In particular,spin-orbit torque MRAM(SOT-MRAM)has the best performance on... Magnetoresistive random access memories(MRAMs)have drawn the attention of radiation researchers due to their potential high radiation tolerance.In particular,spin-orbit torque MRAM(SOT-MRAM)has the best performance on endurance and access speed,which is considered to be one of the candidates to replace SRAM for space application.However,little attention has been given to theγ-ray irradiation effect on the SOT-MRAM device yet.Here,we report the Co-60 irradiation results for both SOT(spin-orbit torque)magnetic films and SOT-Hall devices with the same stacks.The properties of magnetic films are not affected by radiation even with an accumulated dose up to 300 krad(Si)while the magnetoelectronic properties of SOTHall devices exhibit a reversible change behavior during the radiation.We propose a non-equilibrium anomalous Hall effect model to understand the phenomenon.Achieved results and proposed analysis in this work can be used for the material and structure design of memory cell in radiation-hardened SOT-MRAM. 展开更多
关键词 SOT-MRAM γ-ray irradiation TID effect anomalous Hall effect
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Differential Expression of Retrotransposon WIS 2-1A Response to Vacuum, Low-Energy N^+ Implantation and ^(60)Coγ-ray Irradiation in Wheat
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作者 赵慧茹 谷运红 +2 位作者 押辉远 焦浈 秦广雍 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第1期104-109,共6页
Mutagenesis and retrotransposons have a close relationship, but little attention has been paid yet to the activity of retrotransposons produced by physical mutagens. The variation of retrotransposon WIS 2-1A activity ... Mutagenesis and retrotransposons have a close relationship, but little attention has been paid yet to the activity of retrotransposons produced by physical mutagens. The variation of retrotransposon WIS 2-1A activity in wheat (Triticum aestivum L.) embryos at three different growth times (30 h, 45 h and 60 h) was investigated after they had been treated with N^+ implantation in a vacuum of 5× 10^-2 Pa and irradiation by ^60Coγ-ray respectively. For each of the three growth times the expression of WIS 2-1A showed almost entirely a same trend of downregulation, upregulation, then downregulation, and upregulation again with the increase in dose of N^+ implantation, but the expression appeared irregular with the increase in irradiation of ^60Coγ-ray. In conclusion, the acutely activating effect of WIS 2-1A stimulated by vacuum and high dose N^+ implantation within a shorter incubation time may provide a convenient tool to advance the research on mutagenic breeding and function genes. 展开更多
关键词 RETROTRANSPOSON WIS 2-1A transcription activity VACUUM N^+ implantation ^60Coγ-ray irradiation
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A Study of Changes in the Element Composition and Structure of Surfaces under Irradiation of Dense Xenon Gas (270 bar) by y-Rays with a Maximum Energy of 10 MeV
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作者 A. Yu. Didyk G. G. Gulbekian +1 位作者 G. V. Mishinskiy R.Wisniewski 《Journal of Physical Science and Application》 2016年第2期18-28,共11页
A high-pressure chamber filled with natural xenon (XeHPC) under initial pressure 270 bar was irradiated during 43 hours by braking γ-rays with a maximum energy of 10 MeV at the MT-25 electron accelerator at an aver... A high-pressure chamber filled with natural xenon (XeHPC) under initial pressure 270 bar was irradiated during 43 hours by braking γ-rays with a maximum energy of 10 MeV at the MT-25 electron accelerator at an average beam intensity of 20-22 μA. After about 14 hours of irradiation, the pressure in the XeHPC dropped to 185 bar and did not change till the end of the irradiation cycle. Upon completion of exposure, part of the gas from XeHPC was bypassed into a separate reservoir to measure the xenon composition by mass-analyzer QMA-200. After the opening of the XeHPC, an inner assembly without xenon was fixed at the Ge-detector for measurement of γ-spectra of radionuclides produced in the XeHPC and the background during 15 hours. A visual inspection of the inner assembly indicated that the surfaces of its elements were covered with a siskin green layer. Using SEM (scanning electron microscopy) studies and MPRA (microprobe roentgen analysis) , the element compositions of the synthesized micro-objects and micro-particles were determined. In order to explain the observed anomalies in the formation of new elements in the micro-particles and micro-objects, nuclear fission and synthesis reactions should be used. 展开更多
关键词 Element composition structure irradiation XENON γ-rays maximum energy.
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Laser-induced damage threshold in HfO_2/SiO_2 multilayer films irradiated by β-ray 被引量:1
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作者 Mei-Hua Fang Peng-Yu Tian +4 位作者 Mao-Dong Zhu Hong-Ji Qi Tao Fei Jin-Peng Lv Hui-Ping Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第2期294-298,共5页
Post-processing can effectively improve the resistance to laser damage in multilayer films used in a high power laser system. In this work, HfO_2/SiO_2 multilayer films are prepared by e-beam evaporation and then β-r... Post-processing can effectively improve the resistance to laser damage in multilayer films used in a high power laser system. In this work, HfO_2/SiO_2 multilayer films are prepared by e-beam evaporation and then β-ray irradiation is employed as the post-processing method. The particle irradiation affects the laser induced damage threshold(LIDT),which includes defects, surface roughness, packing density and residual stress. The residual stress that is relaxed during irradiation changes from compressive stress into tensile stress. Our results indicate that appropriate tensile stress can improve LIDT remarkably. In view of the fact that LIDT rises from 8 J/cm^2 to 12 J/cm^2, i.e., 50% increase, after the film has been irradiated by 2.2×10^(13)/cm^2 β-ray, the particle irradiation can be used as a controllable and desirable postprocessing method to improve the resistance to laser induced damage. 展开更多
关键词 Β-ray irradiation HFO2/SIO2 multilayer film residual stress LASER-INDUCED damage threshold
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DC Characteristics of Gamma-ray Irradiated SiGe HBT in Comparison with Si BJT
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作者 MENG Xiang-ti HUANG Qian +2 位作者 WANG Ji lin CHEN Pei-yi TSIEN Pei-hsin 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2006年第B12期192-197,共6页
The changes of DC characteristics of SiGe HBT after being submitted to γ-ray irradiation of 700 krad, 7 000 krad and 10 000 krad were compared to those of Si BJT. Generally speaking, Ib and Ib- Ib0 increase with the ... The changes of DC characteristics of SiGe HBT after being submitted to γ-ray irradiation of 700 krad, 7 000 krad and 10 000 krad were compared to those of Si BJT. Generally speaking, Ib and Ib- Ib0 increase with the doses increasing. For SiGe HBT, with the doses increasing, Ic and Ic-Ic0 as well as the related changes of the current gain (β) will decrease at higher Vbe, while for Si BJT, with the doses increasing, after irradiation, Ib and Ic-Ic0 increase; ,8 and its related changes also decrease with their differences, however, tending to be very small at high doses of 7 000 krad and 10 000 krad. Moreover, given the same doses, the decreases of,a are much larger than SiGe HBT, which shows that SiGe HBT's anti-radiation performance proves to be better than Si BJT. Still, in SiGe HBT, some strange phenomena were observed: Ic-Ic0 will increase after the radiation of 7 000 krad in less than 0.65 V and as will ,8 in less than 0.75 V. The mechanism of radiation-induced change in DC characteristies was also discussed. 展开更多
关键词 γ-ray irradiation SiGe HBT Si BJT DC characteristics
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A STUDY ON MECHANICAL PROPERTIES OF γ-RAY IRRADIATED HDPE FILLED WITH SERICITE-TRIDYMITE-CRISTOBALITE
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作者 徐闻 肖望东 徐僖 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1998年第4期339-344,共6页
The effect of γ-ray irradiation on the mechanical properties of high densitypolyethylene(HDPE) filled with sericite-tridymite-cristobalite(STC) was studied. The ex-perimental results show that γ-ray irradiation can ... The effect of γ-ray irradiation on the mechanical properties of high densitypolyethylene(HDPE) filled with sericite-tridymite-cristobalite(STC) was studied. The ex-perimental results show that γ-ray irradiation can improve the affinity between HDPE andSTC, and the dispersion of STC in HDPE matrix. Compared with HDPE/STC (80/20)blend, the yield stress and impact strength of irradiated HDPE (10kGy)/STC (80/20) blendare increased from 22.8 MPa and 70J/m to 28.5 MPa and 144J/m. The yield stress andimpact strength of HDPE/irradiated HDPE/STC (48/32/20) are 27.8MPa and 210J/m,respectively. 展开更多
关键词 γ-ray irradiation High density polyethylene Sericite-tridymite-cristobalite
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STUDY OF RAY IRRADIATION ON DIAMOND-LIKE CARBON FILMS
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作者 G.A. Liu T.M. Wang E.Q 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第1期26-32,共7页
Diamond-like carbon (DLC) films have been deposited on glass substrates usingradio-frequency (rf) plasma deposition method. Gamma -ray, ultraviolet (UV) ray were used toirradiate the DLC films. Raman spectroscopy and ... Diamond-like carbon (DLC) films have been deposited on glass substrates usingradio-frequency (rf) plasma deposition method. Gamma -ray, ultraviolet (UV) ray were used toirradiate the DLC films. Raman spectroscopy and infrared (IR) spectroscopy were use to characterizethe changing characteristics of SP^3 C-H bond and hydrogen content in the films due to theirradiations. The results show that, the damage degrees induced by the UV ray on the SP^3 C-H bondsare much stronger than that by the gamma -ray. When the irradiation dose of gamma -ray reaches 1 OX10^4 Gy, the SP^3 C-H bond reduces about 50 percent in number. The square electrical resistance ofthe films is reduced due to the irradiation of UV ray and this is caused by severe oxidation of thefilms. By using the results on optical gap of the films and the fully constrained network theory,the hydrogen content in the as-deposited films is estimated to be l0-25at. percent. 展开更多
关键词 diamond-like carbon film gamma -ray irradiation ultraviolet rayirradiation SP^3 C-H bond infrared transmittance
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The Influence of <i>γ</i>-Irradiation on Structuration in Solutions of BNR and Properties of Films
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作者 Shiraz M. Mammadov Adil А. Garibov +3 位作者 Оktay A. Аkparov Sehrana A. Rzayeva Аkif K. Salehov Sahile S. Ahmadova 《Open Journal of Physical Chemistry》 2012年第3期182-184,共3页
Studied influence of γ-irradiation on stucturation in butadiene nitrile rubber solution and films properties studied also. Structuration in solutions has defined by rheological method with rotation viscometer. Shown ... Studied influence of γ-irradiation on stucturation in butadiene nitrile rubber solution and films properties studied also. Structuration in solutions has defined by rheological method with rotation viscometer. Shown influence of solvent nature (methyl ethyl ketene: toluene) to strength properties and structures of films obtained from this solvents. It has been found that during irradiation of solvent, films and butadiene nitrile rubber solution characteristic viscosity η increased, increasing of Huggins constant (К') observed as well. Changing of spatial mesh of polymers occurs at the cost of changed size of macromolecule balls. Shown, that in the issue of crossing the properties including thermo dynamical features of films and butadiene nitrile rubber solution has changed. 展开更多
关键词 cross-linking Solvent RHEOLOGY Relaxation Spectrometer Radiation Viscosity irradiation
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The Radiation Degradation of Neutral Red Solution by <i>γ</i>-Ray
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作者 Xiu-Hua Liu Yi Yi Deng +3 位作者 Yin-Hang Zhou Liang Xia Lan-Lan Ding Yu-Chuan Zhang 《World Journal of Nuclear Science and Technology》 2012年第4期133-137,共5页
Neutral red is kind of biologic colourant and acidity-basicity indicator. Radiation degradation of neutral red in aqueous solution was done by γ-Ray. The removal rate of chemical oxygen demand, total organic carbon, ... Neutral red is kind of biologic colourant and acidity-basicity indicator. Radiation degradation of neutral red in aqueous solution was done by γ-Ray. The removal rate of chemical oxygen demand, total organic carbon, chroma and the changing of pH value were studied under various conditions. With the increase of absorbed doses, the chemical oxygen demand and chroma decreased conspicuously. The absorbed dose rate has little effect on the degradation of neutral red. When the absorbed doses are the same, the chemical oxygen demand and chroma decreased more obviously with the increase of neutral red concentration. Weak basic condition and proper H2O2 addiation are propitious to removal of chemical oxygen demand of neutral red. 展开更多
关键词 γ-ray irradiation NEUTRAL Red Degradation
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Stability of pyrrolidone derivatives against γ-ray irradiation 被引量:2
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作者 NOGAMI Masanobu SUGIYAMA Yuichi +5 位作者 KAWASAKI Takeshi HARADA Masayuki KAWATA Yoshihisa MORITA Yasuji KIKUCHI Toshiaki IKEDA Yasuhisa 《Science China Chemistry》 SCIE EI CAS 2012年第9期1739-1745,共7页
To evaluate the stability of N-alkylated pyrrolidone derivatives (NRPs), which are supposed to be used as precipitants for U(VI) and Pu(IV, VI) species in HNO3 media, under irradiation environment, some candidat... To evaluate the stability of N-alkylated pyrrolidone derivatives (NRPs), which are supposed to be used as precipitants for U(VI) and Pu(IV, VI) species in HNO3 media, under irradiation environment, some candidate NRPs were irradiated by γ-ray. Irradia- tion to HNO3 solutions up to 6 mol dm-3 (= M) containing 2 M N-n-butyl-2-pyrrolidone (NBP), one of NRPs with lower hy- drophobicity, has revealed that the residual ratios of NBP in the samples of HNO3 up to 3 M decreased identically and linearly. Approximately 20% of NBP was found to be degraded after the irradiation at 1 MGy. It was also found that the decrease in the precipitation ratio of UOf+ (P.R., %) was gentle and that the P.R. values were relatively in accordance with the residual ratios of NBP. On the other hand, the degradation of the samples irradiated in 6 M HNO3 was found more distinguished. It was pro- posed from the analyses of degraded compounds that the degradation of NBP in HNO3 by γ-ray irradiation started from the cleavage of the pyrrolidone ring by the addition of oxygen atom originating from HNO3, followed by the formation of chain compounds by the successive addition of oxygen, leading to the generation of oxalic acid and acetic acid. The stability of other NRPs in 3 M HNO3 was evaluated to be nearly identical with that of NBP except lower P.R. values of the samples containing NRPs with higher hydrophobicity irradiated at more than 0.5 MGy. 展开更多
关键词 pyrrolidone derivatives precipitants γ-ray irradiation HNO3 U(VI)
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Effects of γ-Ray Irradiation on the Fatigue Strength, Thermal Conductivities and Thermal Stabilities of the Glass Fibres/Epoxy Resins Composites 被引量:2
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作者 Li-Fang Zheng Lu-Ning Wang +1 位作者 Zhao-Zhong Wang Li Wang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2018年第1期105-112,共8页
Glass fibres/epoxy resins composites have been performed as ideal materials to make support instruments for high-energy and nuclear physics experiments. The effects of the 3,-ray irradiation on the fatigue strength, t... Glass fibres/epoxy resins composites have been performed as ideal materials to make support instruments for high-energy and nuclear physics experiments. The effects of the 3,-ray irradiation on the fatigue strength, thermal conductivities and thermal stabilities of the glass fibres/epoxy resins composites were investigated. And a two-parameter fatigue life model was established to predict the fatigue life of the composites. Results revealed that the y-ray irradiation could probably result in the degradation of epoxy resins, but hardly damage to the glass fibres. And the γ-ray irradiation treatment could significantly affect the fatigue strength of the composites at a low-cycle fatigue stage, but seldom influence at a high-cycle fatigue stage. Furthermore, the fabricated glass fibres/epoxy resins composites after the γ-ray irradiation still presented excellent fatigue strength, ideal thermal conductivities, remarkable dimensional and thermal stabilities, which can meet the actual requirements of normal operation for supporting instruments under high-energy and nuclear physics experiments. 展开更多
关键词 Epoxy resins composites Glass fibres Fatigue strength γ-ray irradiation Thermal stabilities
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Highly pressure-sensitive graphene sponge fabricated by γ-ray irradiation reduction
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作者 Tiezhu Zhang Tao Wang +6 位作者 Yali Guo Yiheng Zhai Aiqin Xiang Xuewu Ge Xianghua Kong Hangxun Xu Hengxing Ji 《Science China Materials》 SCIE EI CSCD 2018年第12期1596-1604,共9页
Graphene sponge(GS) with microscale size, high mechanical elasticity and electrical conductivity has attracted great interest as a sensing material for piezoresistive pressure sensor. However, GS offering a lower limi... Graphene sponge(GS) with microscale size, high mechanical elasticity and electrical conductivity has attracted great interest as a sensing material for piezoresistive pressure sensor. However, GS offering a lower limit of pressure detection with high gauge factor, which is closely dependent on the mechanical and electrical properties and determined by the fabrication process, is still demanded. Here, γ-ray irradiation reduced GS is reported to possess a gauge factor of 1.03 kPa^–1 with pressure detection limit of 10 Pa and high stress retention of 76% after 800 cycles of compressing/relaxation at strain of 50%. Compared with the carbon nanotube(CNT) reinforced GS, the improved lower limit of pressure detection and gauge factor of the GS prepared by γ-ray irradiation is due to the low compression stress(0.9 kPa at stain of 50%). These excellent physical properties of the GS are ascribed to the mild,residual free, and controllable reduction process offered by γ-ray irradiation. 展开更多
关键词 graphene sponge piezoresistive pressure sensor γ-ray irradiation
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Modified Nafion Polymer Electrolyte Membranes by 7-Ray Irradiation Used in Direct Methanol Fuel Cells
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作者 索春光 张文斌 +1 位作者 王华 杨凤杰 《Journal of Shanghai Jiaotong university(Science)》 EI 2012年第5期579-585,共7页
Modification of the commercial polymer electrolyte membrane (PEM) Nation 117 by γ-ray irradiation to produce an improved proton exchange membrane for direct methanol fuel cells (DMFCs) was described. The Nation 1... Modification of the commercial polymer electrolyte membrane (PEM) Nation 117 by γ-ray irradiation to produce an improved proton exchange membrane for direct methanol fuel cells (DMFCs) was described. The Nation 117 membrane was exposed under γ-ray irradiation circumstance with the irradiation doses from 103 to 105 Gy. Subsequently the properties of the membrane itself, in terms of swelling ratio, water uptake rate, proton conductivity and methanol permeability, together with the performance of its membrane electrode assembly (MEA) in DMFC were analyzed and contrasted with the untreated material. When the Nation 117 membrane was exposed under γ-ray irradiation circumstance, the degradation and crosslinking reactions occurred at the same time. Specific scopes of the γ-ray irradiation dose may cause the membrane crosslinking, thus reduce the membrane swelling ratio and decrease the methanol crossover. By reducing the membrane swelling ratio and methanol permeation, the single DMFC with the modified Nation 117 membrane produced reasonable power density performance as high as 32 W/m2 under 2 mol/L methanol solution at room temperature. 展开更多
关键词 Nafion 117 membrane γ-ray irradiation MODIFICATION direct methanol fuel cell(DMFC)
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