Nuclear Analysis最新文献_第7页

Crystallization of polycaprolactone with low coverage of cyclodextrin 低环糊精覆盖率的聚己内酯结晶

Nuclear Analysis Pub Date : 2022-06-01 DOI: 10.1016/j.nucana.2022.100022

Nan Tian , Jing Chen , Jie Kong

引用次数: 0

VSAS: A smart small-angle scattering data processing tool 智能小角度散射数据处理工具

Nuclear Analysis Pub Date : 2022-06-01 DOI: 10.1016/j.nucana.2022.100012

Shuxin Shi , Shengyi Zhong , Lu Jin , Yifei Tang , Hao Lin

引用次数: 0

Transport and magnetic properties of CeAuGa3 single crystals CeAuGa3单晶的输运和磁性能

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100002

Baijiang Lv, Benqiong Liu

{"title":"Transport and magnetic properties of CeAuGa3 single crystals","authors":"Baijiang Lv, Benqiong Liu","doi":"10.1016/j.nucana.2022.100002","DOIUrl":"10.1016/j.nucana.2022.100002","url":null,"abstract":"<div>Single crystals of CeAuGa3 which crystallize in a BaAl4-type structure are synthesized and their physical properties were investigated by magnetization, transport, and specific heat measurements. The BaAl4-type CeAuGa3 is a highly anisotropic ferromagnet with the transition temperature with <math><mrow><msub><mi>T</mi><mi>c</mi></msub><mo>=</mo><mn>1.8</mn><mspace></mspace><mspace></mspace><mtext>K</mtext></mrow></math>, which is confirmed by the hysteresis loop at low temperatures in magnetization measurements. Crystalline-electric field plays an important role in magnetic properties and the small Sommerfeld coefficient <math><mrow><mi>γ</mi><mo>=</mo><mn>12.6</mn><mspace></mspace><mspace></mspace><mtext>mJ</mtext><mo>/</mo><msup><mtext>mol K</mtext><mn>2</mn></msup></mrow></math> indicates that CeAuGa3 has a weak Kondo effect. These observations demonstrate that CeAuGa3 is an interesting example involving the possible interplay of ferromagnetic, crystalline-electric field and Kondo effect.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 1","pages":"Article 100002"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000027/pdfft?md5=868a1bce59e1e58b927e3716321581bb&pid=1-s2.0-S2773183922000027-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83827704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of oxygen on the radiation of silicone rubber determined by gaseous chromatograph and DFT calculation 气相色谱仪测定氧对硅橡胶辐射的影响及DFT计算

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100005

Lei Yu , Shuai Liu , Bo Liu , Zhenghao Mao , Wei Huang , Jing Peng , Yinyong Ao

{"title":"Effect of oxygen on the radiation of silicone rubber determined by gaseous chromatograph and DFT calculation","authors":"Lei Yu , Shuai Liu , Bo Liu , Zhenghao Mao , Wei Huang , Jing Peng , Yinyong Ao","doi":"10.1016/j.nucana.2022.100005","DOIUrl":"10.1016/j.nucana.2022.100005","url":null,"abstract":"<div>The radiation effects of silicone rubber under different atmospheres are of great significance to evaluate the aging behavior of materials, and to assess their practical application life. The radiation-induced cross-linking and degradation of polydimethylsiloxane rubber were confirmed firstly by 1H NMR and high-temperature GPC, respectively. By using the established gas collecting system and gaseous chromatography method, we systematically investigated the gaseous products of irradiated silicone rubber at different oxygen concentrations. With the increase of oxygen concentration, the yield of CH4 decreases sharply, while the yield of hydrogen changes slightly. It can be further demonstrated that the reduction of CH4 concentration in the irradiated silicone rubber system is mainly due to the inhibition of CH4 formation, instead of the CH4 degradation, indicating that oxygen directly influences the conversion process of methyl radicals. Similarly, by monitoring the oxygen consumption, it is proved that oxygen is directly involved in the degradation process of silicone rubber, and oxygen scavenged the methyl radicals, which supressed the conversion process of methyl radicals to CH4. Finally, the radiation-induced crosslinking and degradation mechanism of raw silicone rubber was deduced by combining the gaseous products analysis and DFT calculation. It is demonstrated that the release of CH4 can be used to assess the radiation effect of silicone rubber. This work provides a novel method to understand deeply the radiation-induced crosslinking and degradation mechanism of silicone rubber under different atmospheres.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 1","pages":"Article 100005"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000052/pdfft?md5=69c12d575d12140cc8b484554c2d0fe7&pid=1-s2.0-S2773183922000052-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91123757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Progress on nuclear analysis techniques 核分析技术的进展

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100007

Shuming Peng, Taiping Peng, Guangai Sun

引用次数: 1

A general picture for water dissociation on uranium dioxide surfaces 水在二氧化铀表面解离的一般情况

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100006

Wenting Lv , Cui Zhang , Zhongwei Zhao , Haitao Liu , Bo Sun , Yu Yang , Ping Zhang

{"title":"A general picture for water dissociation on uranium dioxide surfaces","authors":"Wenting Lv , Cui Zhang , Zhongwei Zhao , Haitao Liu , Bo Sun , Yu Yang , Ping Zhang","doi":"10.1016/j.nucana.2022.100006","DOIUrl":"10.1016/j.nucana.2022.100006","url":null,"abstract":"<div>Despite extensive theoretical and experimental studies, there is still no universal picture for water dissociation on actinide dioxide surfaces. Based on ab initio molecular dynamics studies, we systematically investigated the influences of surface morphology and stoichiometry of the UO2 (001) surface on the adsorption behavior of a water molecule. We find that the critical factor corresponding to water dissociation is the existence of surface actinide atoms. On the normal UO2 (001) surface, surface U atoms are ready to bond with dissociated hydroxyl groups and the adsorbed water molecules dissociate spontaneously upon approaching. Comparatively, the surface U atoms on the oxygen-over surface are fully bonded with oxygen atoms, and the approaching water molecule do not dissociate. On a more realistic trench UO2 surface, we find that approaching water molecules can steadily adsorb in the trench area after weakly bonding with two oxygen atoms in the trench. Our work reveals the vital role of surface actinide atoms in dissociating approaching water molecules, which is meaningful for macroscopic modellings of actinide corrosion.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 1","pages":"Article 100006"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000064/pdfft?md5=d5af094538c45d3cb7f12ca263830959&pid=1-s2.0-S2773183922000064-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76523688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of sink strength on helium bubble formation at elevated temperatures 沉降强度对高温下氦泡形成的影响

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100003

Zhanfeng Yan , Yanru Lin

{"title":"The effect of sink strength on helium bubble formation at elevated temperatures","authors":"Zhanfeng Yan , Yanru Lin","doi":"10.1016/j.nucana.2022.100003","DOIUrl":"10.1016/j.nucana.2022.100003","url":null,"abstract":"<div>In present study, the model Fe–9Cr alloy and two nanostructured ferritic alloys (NFAs) CNA1 and 9YWTV with high application potential in advanced nuclear power systems were selected to systematically investigate the effect of sink strength on helium bubble behavior at elevated temperatures. Helium bubble formation for a constant implanted He concentration of ∼7500 atomic parts per million (appm) was characterized using transmission electron microscopy (TEM) at 500 and 700 °C. A quantitative research and comparison of the influence for a specific sink strength on bubble formation was illustrated. Results showed that the introduction of nanoparticles into NFAs can effectively reduce bubble coarsening by sequestering the implanted helium into dispersed small bubbles due to the sufficient He entrapment by interfaces between the nanoprecipitates and the surrounding matrix. In addition, the NFAs with higher sink strength (9YWTV) revealed a higher suppression effects on bubble growth compared to general particle-free Fe–9Cr alloy and CNA1 with lower sink strength. This can be attributed to the comparable mean free path of He diffusion with the inter-particle distance for high particle density in 9YWTV. Meanwhile, the suppression effects of sinks on bubble growth decreased with increasing temperature from 500 to 700 °C. The sink strength of the order of 1015 m−2 and 1016 m−2 showed favorable suppression effect on bubble coarsening at 500 °C and 700 °C, respectively.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 1","pages":"Article 100003"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000039/pdfft?md5=4d5c4ecc8d96bceadac9673fe400c17c&pid=1-s2.0-S2773183922000039-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82766887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Fabrication of CeO2 microspheres by sol−gel reaction with polymerization via single emulsion 溶胶-凝胶反应-单乳液聚合法制备CeO2微球

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100008

Jianxing Ma, Yuzhe Hong, Yueming Sun, Fei Peng

引用次数: 3

In-situ TEM study of loop evolution in FeCrAl alloy under Fe+ irradiation: Effects of temperatures, dislocations and precipitates Fe+辐照下feral合金环演化的原位TEM研究:温度、位错和析出相的影响

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100001

Kefei Pei , Guang Ran , Yipeng Li , Ziqi Cao , Dewang Cui , Ruiqian Zhang , Gang Yang

{"title":"In-situ TEM study of loop evolution in FeCrAl alloy under Fe+ irradiation: Effects of temperatures, dislocations and precipitates","authors":"Kefei Pei , Guang Ran , Yipeng Li , Ziqi Cao , Dewang Cui , Ruiqian Zhang , Gang Yang","doi":"10.1016/j.nucana.2022.100001","DOIUrl":"10.1016/j.nucana.2022.100001","url":null,"abstract":"<div>Fe13.5Cr4.7Al alloy was irradiated in-situ with 400 keV Fe+ in TEM at RT and 748 K. The evolution of dislocation loops under the influence of temperatures, irradiation dose, dislocation lines and precipitates were characterized in detail. The loop rafting was found at RT irradiation for the first time and the growth direction of the rafted loops was along g = 110 direction. However, this phenomenon was not observed at 748 K and only the dislocation complex was appeared. The formation conditions of loop rafting were low temperature and a certain value of irradiation dose. The average size and number density of dislocation loops as a function of irradiation dose in the regions with dislocation lines, precipitates and no dislocation lines/precipitates were constructed and analyzed comparatively. At the same irradiation dose, sample irradiated at higher temperature has larger average loop size and lower loop number density. There was a complex interaction between dislocation line-loop at 748 K, but few interactions were observed at RT. At any irradiation dose, the loop number density in the region with dislocation lines was smaller than that in the region without dislocation lines, but the average loop size was slightly opposite. Moreover, the higher the irradiation temperature, the more obvious the effects of precipitates and dislocation lines on loop evolution were. Our current results provide a fundamental insight into how the dislocations, precipitates and dose affect loop evolution and characteristics in FeCrAl alloy at elevated temperatures.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 1","pages":"Article 100001"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000015/pdfft?md5=d054a3e10e4fbdd7e32ad4cef1d0bb57&pid=1-s2.0-S2773183922000015-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75232564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Vertical and spatial distribution of plutonium and radio-cesium in lake sediment of China 中国湖泊沉积物中钚和放射性铯的垂直和空间分布

Nuclear Analysis Pub Date : 2022-03-01 DOI: 10.1016/j.nucana.2022.100004

Dongxia Feng , Meichen Ji , Haiqing Liao , Chaojun Lu , Fang Yang , Xingxuan Zhou , Shiqi Jia

{"title":"Vertical and spatial distribution of plutonium and radio-cesium in lake sediment of China","authors":"Dongxia Feng , Meichen Ji , Haiqing Liao , Chaojun Lu , Fang Yang , Xingxuan Zhou , Shiqi Jia","doi":"10.1016/j.nucana.2022.100004","DOIUrl":"10.1016/j.nucana.2022.100004","url":null,"abstract":"<div>Anthropogenic radionuclides of plutonium and 137Cs in the environment were usually applied for tracing the environmental impact of nuclear activities as well as establishing the chronology of recent lake sediment. In this study, the vertical distribution and spatial differentiation of plutonium and 137Cs in lake sediments of China were systematically contrastive analyzed to elucidate the regional influence by the local fallout from Chinese nuclear tests. The results demonstrated that the inventory of 137Cs and 239,240Pu, and their isotopic composition in lake sediments in northwestern China were obviously different from other regions, indicating that a portion of radionuclides in lakes in northwest China were originated from the Chinese Lop Nor Nuclear Test site (CNTs), and radionuclides in lakes of other regions may be completely originated from global fallout. Usually, the anthropogenic radionuclides recorded in lake sediments showed a single peak corresponding to the maximum deposition of 1964. However, two or three accumulation peaks of radionuclides were also observed in a few lakes. For the application of radionuclides on the dating of recent sediment, the accumulative peak of 239,240Pu and 137Cs signed to the period of 1963–1964 is the only practicable time marker for lake sediments in other regions of China. Isotopic information, such as 240Pu/239Pu ratio and 239,240Pu/137Cs activity ratio, may be useful for accurate sediment chronology, as well as used as a fingerprint to identify the source of the associated radioactive substance in the environment.</div>","PeriodicalId":100965,"journal":{"name":"Nuclear Analysis","volume":"1 1","pages":"Article 100004"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2773183922000040/pdfft?md5=998618bfbb2a3f1370d6b86f0e4c05f2&pid=1-s2.0-S2773183922000040-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89380028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4