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A non-equilibrium molecular dynamics study of the thermal conductivity of uranium dioxide
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作者 WANG Zenghui HUANG Xiaofeng 《Nuclear Science and Techniques》 SCIE CAS CSCD 2010年第1期39-43,共5页
The thermal conductivity of uranium dioxide in the temperature range of 300–2400 K was estimated by non-equilibrium molecular dynamics calculation using Fourier law.The Kawamura function was adopted as the interatomi... The thermal conductivity of uranium dioxide in the temperature range of 300–2400 K was estimated by non-equilibrium molecular dynamics calculation using Fourier law.The Kawamura function was adopted as the interatomic potential function.The calculated thermal conductivities are found to be strongly dependent on the temperature of the simulation cube.The thermal conductivity simulation results are compared with the experiment results and agreed well with the experimental results when the temperature is above 600 K.The thermal conductivities scale effects are found to be existed in uranium dioxide nanometer thin film.The approximate mean free paths of phonons in different temperatures can be examined. 展开更多
关键词 非平衡分子动力学 二氧化铀 热导率 模拟计算 温度范围 温度依赖性 傅里叶法 仿真结果
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肥胖儿童non-HDL-C、remnant cholesterol与亚临床动脉粥样硬化的关系 被引量:4
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作者 焦朝艳 刘戈力 +4 位作者 鲍鹏丽 魏莹 杨箐岩 郑荣秀 赵菁 《天津医科大学学报》 2014年第1期25-28,共4页
目的:了解non-HDL-C和remnant cholesterol与肥胖儿童亚临床动脉粥样硬化(AS)的关系。方法:根据甘油三酯(TG)水平将65例肥胖儿童(肥胖组)分为I组(TG≥2.3 mmol/L)32例,II组(TG<2.3 mmol/L)33例,与肥胖组儿童性别年龄相匹配的正常体... 目的:了解non-HDL-C和remnant cholesterol与肥胖儿童亚临床动脉粥样硬化(AS)的关系。方法:根据甘油三酯(TG)水平将65例肥胖儿童(肥胖组)分为I组(TG≥2.3 mmol/L)32例,II组(TG<2.3 mmol/L)33例,与肥胖组儿童性别年龄相匹配的正常体质量儿童30例为III组(对照组)。比较3组儿童血脂指标,对肥胖组各项血脂指标与血浆致动脉粥样硬化指数(AIP)进行相关性分析,肥胖患儿体质指数、血脂指标与颈动脉内径、内膜-中层厚度(c-IMT)、血流参数进行相关性分析。结果:I组、II组的TG、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、non-HDL-C、remnant cholesterol、AIP均较对照组升高,高密度脂蛋白胆固醇(HDL-C)较对照组降低,且I组的remnant cholesterol、AIP均较II组升高。肥胖组儿童AIP与TG、non-HDL-C、remnant cholesterol呈正相关,与HDL-C呈负相关。37例行颈动脉超声检查的肥胖儿童的c-IMT较正常儿童的增厚。结论:non-HDL-C、remnant cholesterol在肥胖儿童亚临床AS中有重要作用,在肥胖儿童血脂异常的治疗中应关注non-HDL-C、remnant cholesterol的变化。 展开更多
关键词 儿童肥胖 亚临床动脉粥样硬化 non—HDL—C REMNANT CHOLESTEROL 血浆致动脉粥样硬化指数 颈动脉内膜-中层厚度
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Shenqi Fuzheng injection combined with GP chemotherapy in the treatment of advanced non-small cell lung cancer: a meta-analysis 被引量:13
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作者 Qiang Zhang Yi-Huan Fan +2 位作者 Teng Zhang Xiao-Lan Qin Ji-Fang Song 《TMR Integrative Medicine》 2017年第2期68-78,共11页
Objective: To evaluate the clinical efficacy of Shenqi Fuzheng injection combined with gemcitabine plus cisplatin(GP) in the treatment of advanced non-small cell lung cancer (NSCLC). Methods: we performed a syst... Objective: To evaluate the clinical efficacy of Shenqi Fuzheng injection combined with gemcitabine plus cisplatin(GP) in the treatment of advanced non-small cell lung cancer (NSCLC). Methods: we performed a systematicsearch in the electronic databases such as Cochrane Library, Pubmed, Embase, Chinese Journal Full-text Database,Chinese Biomedical Literature Database, Chinese Science and Technology Periodical Full-text Database andWanfang Database up to 30 January 2017. Randomized controlled trials (RCT) of Shenqi Fuzheng Injectioncombined with GP chemotherapy in the treatment of advanced NSCLC were searched, and all the RCTs wereconducted on methodological quality assessment. Data extraction and data analysis were according to standards ofCochrane systematic review. Results: Eight trials were included including a total of 701 patients. Meta-analysisresults: Shenqi Fuzheng injection combined with GP chemotherapy could significantly improve the functionalstatus of patients with NSCLC (OR = 3.44, 95% CI [2.26, 5.25], P 〈 0.0001) and clinical treatment efficacy (OR =(OR = 0.31, 95%CI [0.20, 0.47], P 〈 0.0001. The rate of leukopenia (OR = .31, 95%CI [0.20,0.47], P 〈 0.0001),thrombocytopenia (OR = 0.58, 95%CI [0.37, 0.91], P = 0.020), hemoglobin decline ((OR = 0.31, 95%CI [0.16,0.59], P = 0.0004) and incidence of gastrointestinal reactions (OR = 0.58,P 〈 0.05) could be reduced. Conclusion:Shenqi Fuzheng injection combined with GP chemotherapy in the treatment of advanced NSCLC obtainedsignificantly clinical efficacy. The quality of the literature incorporated is low, the conclusion requires high-qualityresearch to further prove. 展开更多
关键词 Shenqi Fuzheng GP chemotherapy Advanced non - small cell lung cancer Meta analysis
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Analysis of Numerical Results in High Temperature Congealment and Chemistry Non-equilibrium Flow Field
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作者 Hong-tao Zheng Zhi-yong Tan +2 位作者 Hai-ou Sun Chun-liang Zhou Zhi-ming Li 《Journal of Marine Science and Application》 2002年第1期26-34,共9页
Using the air plasma ignition technique, physicochemical process of burning can be accelerated; concentration limit ofretrofires both can be extended; reliability of retrofires and stability of burning can be improved... Using the air plasma ignition technique, physicochemical process of burning can be accelerated; concentration limit ofretrofires both can be extended; reliability of retrofires and stability of burning can be improved. In this paper, using internalequivalent heat area in place of electric are that created Ohm heat, the flow fields of thermodynamic equilibrium chemistry con-gealment and chemistry non-equilibrium in the plasma generator were simulated. The influences of the inlet prerotation angleof air, the inlet total pressure of air and the airflow compression angle of spray nozzle on the temperature on the surface of elec- 展开更多
关键词 plasma GENERATOR CHEMISTRY non - EQUILIBRIUM IGNITION technique numerical calculation
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Turbulent Flow Action of Pulp in Wet - Laid Non - Woven Processes
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作者 程隆棣 黄秀宝 于修业 《Journal of China Textile University(English Edition)》 EI CAS 2000年第3期57-59,共3页
The paper deals with the fluid field of web forming in wet-laid non-woven production.The influence of the turbulent flow on blending fiber and occluded fluid produced in pulp flow has been discussed in theory and prac... The paper deals with the fluid field of web forming in wet-laid non-woven production.The influence of the turbulent flow on blending fiber and occluded fluid produced in pulp flow has been discussed in theory and practice.The suitable use of the imported velocity of pulp is very important in producing wet-laid products of good quality. 展开更多
关键词 WET - laid non - woven fiber PULP FLOW TURBULENT FLOW layer FLUID occluded FLUID .
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CYFRA 21-1 as an early predictor of first line chemotherapy response in advanced non small cell lung cancer
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作者 Kashif Iqbal 《The Chinese-German Journal of Clinical Oncology》 CAS 2007年第3期250-253,共4页
Objective: In an era of ever evolving, promising new therapies for advanced non small cell lung cancer (NSCLC), early predictors of response to therapy, are needed. We evaluated early variations in CYFRA 21-1 serum... Objective: In an era of ever evolving, promising new therapies for advanced non small cell lung cancer (NSCLC), early predictors of response to therapy, are needed. We evaluated early variations in CYFRA 21-1 serum levels of patients with advanced NSCLC receiving first line chemotherapy and correlated the results with objective tumor response. Methods: 29 consecutive, previously untreated, patients of advanced non small cell lung cancer, with measurable disease on CT scan were evaluated. All patients were treated with conventional systemic chemotherapy, although the choice of chemotherapy was left to the discretion of the treating physicians. Serum samples were obtained immediately before the start of 1st and 2nd cycles of chemotherapy. CYFRA 21-1 was measured with an electrochemiluminescense immunoassay on an automatic analyzer (Elecsys 2000; Roche Diagnostics). Response was evaluated using Response evaluation criteria in solid tumors (RECIST) criteria. Results: 10 patients had partial response, 9 patients had stable disease and 9 had progressive disease. None of the patients had complete response. 21/29 (72%) patients had an elevated baseline value of CYFRA 21-1.62% patients (18/29) had a decrease in CYFRA 21-1 after 1 cycle of chemotherapy. The average reduction in the 2nd reading was irrespective of whether baseline value was normal or not. The average reduction was statistically significant (P = 0.002; 95% CI, from 0.8369 to 3.49464; t test). 8 out of 10 (80%) patients with partial response had a reduction in their 2nd reading of. CYFRA (P = 0.019; 95% CI, from 0.81965 to 7.20035; t test) which was significant. We also observed that 6/9 (66%) patients whose disease remains stable also had a decrease in their subsequent reading (P = 0.0106; 95% CI, from -0.44942 to 3.82720; t test), though it was not significant statistically. Although 5 out of 9 (55%) patients, who had an increase in their CYFRA 21-1 level, had progressive disease, but it was not statistically significant (P = 0.537; 95% CI, from -1.20021 to 2.13354; ttest). 14 out of 19 (73%) who either had partial response or had stable disease, had a reduction in their 2nd value of CYFRA 21-1 and was significant statistically (P = 0.004; 95% CI, from 0.74792 to 3.50208; t test). We also observed that except for 1 patient, all patients who had a decrease of 42% or more in their subsequent CYFRA 21-1 level, were those who had either responded to chemotherapy or had stable disease (P = 0.001), which was statistically significant. Conclusion: We can conclude that monitoring of serum marker CYFRA 21-1, early dudng first-line chemotherapy may be a useful prognostic tool for evaluation of early tumor response in patients with advanced NSCLC. 展开更多
关键词 CYFRA 21-1 non small cell lung cancer CHEMOTHERAPY RESPONSE
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MiR-16-5p plays an inhibitory role in human non-small cell lung cancer through Fermitin family member 2
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作者 JUNQI GUO YUN YANG +6 位作者 WEI ZHAO ZHONGHAI YAN XIA YANG YUNFEI YAN RUIMIN HAO JINXIA HU FEI JIAO 《BIOCELL》 SCIE 2021年第3期627-638,共12页
Increasing evidence indicates that aberrant expressions of some microRNAs are associated with cancer progression.However,the roles and biological mechanisms of miRNA-16-5p in human non-small cell lung cancer(NSCLC)are... Increasing evidence indicates that aberrant expressions of some microRNAs are associated with cancer progression.However,the roles and biological mechanisms of miRNA-16-5p in human non-small cell lung cancer(NSCLC)are not to be well studied.Here,we validated that the expression of miR-16-5p was decreased significantly in NSCLC samples and cell lines.The correlation between the clinicopathological features of NSCLC and the miR-16-5p expression showed that the expression of miR-16-5p in non-small cell lung cancer was linked with the advanced TNM stage,positive lymph node metastasis,with short overall survival(OS).Also,a negative correlation between miR-16-5p and Fermitin family member 2(FERMT2)was observed,implying there may be a potential link about their regulation.The hypothesis was further confirmed by in-silico analysis and dual-luciferase reporter assay.Moreover,we demonstrated that the transfections of miR-16-5p mimics could alter some biological characteristics of NSCLC cells remarkably accomplished by the expression variance of FERMT2 in vitro and in vivo assays.Summarily,this study demonstrated that miR-16-5p,as a tumor suppression factor in NSCLC by targeting FERMT2,could serve as one promising biomarker in the prediction for NSCLC patients. 展开更多
关键词 miR-16-5p non–small-cell lung cancer(NSCLC) Fermitin family member 2(FERMT2) APOPTOSIS INVASION Overall survival(OS)
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急冷U-V合金的相组成与热稳定性研究
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作者 张鹏国 张培 +2 位作者 柯海波 吴敏 黄火根 《铸造技术》 CAS 2019年第6期524-527,共4页
铀-钒合金在核工业领域具有潜在应用,为更充分地了解其合金化特性,需进一步确认这种合金在急冷条件下的相组成和热稳定性。在共晶点U82V18附近设计了系列成分的U-V合金,通过甩带技术制备急冷条带样品,采用X射线衍射和差式扫描量热方法... 铀-钒合金在核工业领域具有潜在应用,为更充分地了解其合金化特性,需进一步确认这种合金在急冷条件下的相组成和热稳定性。在共晶点U82V18附近设计了系列成分的U-V合金,通过甩带技术制备急冷条带样品,采用X射线衍射和差式扫描量热方法研究了其相组成与热稳定性。结果表明,它们在急冷凝固条件下(冷却速率达106K/s量级)形成了α-U固溶体、V固溶体与非晶的组成,比平衡凝固条件下多生成了非晶相。这些急冷合金在升温过程中,除了非晶晶化过程外,其他相转变过程基本符合平衡态相图特征。相比于其它合金,U82V18合金中的非晶相具有最高的热稳定性,这应该归功于其共晶成分优势。本研究证实了熔体凝固速率对U-V合金的相组成存在影响。 展开更多
关键词 铀合金 钒合金 非晶相 非平衡凝固
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FAREY SEQUENCE OF NONLINEAR DIFFERENTIAL DYNAMIC SYSTEM IN TWO DIMENSIONS 被引量:1
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作者 H. Q. Jin and S. N. Xu Shenyang Institute of Technology , Shenyang 110015 , China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期1234-1236,共3页
In this paper , through the discrim ination of Farey sequence in the forced Brusselator withweak coupling , it is proved that there is a topological translation fro m a nonlinear differen tial system ( limit cycle)... In this paper , through the discrim ination of Farey sequence in the forced Brusselator withweak coupling , it is proved that there is a topological translation fro m a nonlinear differen tial system ( limit cycle) to the circle m ap . 展开更多
关键词 non - linearity Farey sequence phase lock CHAOS
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2019—2020年我国部分非铀矿山氡浓度监测结果与分析 被引量:1
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作者 武云云 宋延超 +2 位作者 张庆召 崔宏星 侯长松 《辐射防护》 CAS CSCD 北大核心 2023年第S01期61-66,共6页
2019—2020年,选择我国黑龙江等11个省(自治区)的75座非铀矿山,采用固体核径迹探测器累积测量矿山氡浓度,结果显示,金属矿山55座(N=416),井下氡浓度算术均值(AM)为(1334±3301)Bq/m^(3),几何均值(GM)为(317±4.6)Bq/m^(3),范围2... 2019—2020年,选择我国黑龙江等11个省(自治区)的75座非铀矿山,采用固体核径迹探测器累积测量矿山氡浓度,结果显示,金属矿山55座(N=416),井下氡浓度算术均值(AM)为(1334±3301)Bq/m^(3),几何均值(GM)为(317±4.6)Bq/m^(3),范围22~28314 Bq/m^(3);非金属矿山16座(N=113)AM和GM分别为(162±151)Bq/m^(3)和(125±2)Bq/m^(3),范围22~971 Bq/m^(3)。井下529个测量点,氡浓度超过300 Bq/m^(3)的测量点占测量总数的31.8%,超过1000 Bq/m^(3)和2700 Bq/m^(3)的测点分别占测量总数的19.8%和9.3%。21座金属矿山井下氡浓度超过1000 Bq/m^(3),占调查总矿山的28%。金属矿山矿工的年有效剂量均值为8.38 mSv,非金属矿山矿工的年有效剂量均值为1.01 mSv。可以看出,我国金属矿山井下氡浓度高的问题很突出。建议今后加强金属矿山工作场所氡的监测和矿工氡个人剂量监测,加强通风工程防护,并借鉴国际机构的管理模式,尽快实行分级管理。 展开更多
关键词 非铀矿山 氡浓度 固体核径迹探测器 剂量估算
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Ways to Overcome Anxiety in the English Listening Class in College (SUN JING-YU KE SU-FEN)
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作者 孙晶玉 柯素芬 《呼伦贝尔学院学报》 1999年第1期74-77,87,共5页
In my ten-yeat experience of tenching English as major in college , I feel that students experience more difficulties in listening lessons than in other lessons. What, then, prevents students from achieving success in... In my ten-yeat experience of tenching English as major in college , I feel that students experience more difficulties in listening lessons than in other lessons. What, then, prevents students from achieving success in the listening class? I suggest that anxiety is one of the major factors, which interferes with students listening comprehension. And I would agree with writers such as Gardner and Horwitz et al. (1991)that anxiety may impede learner’s ability to perform successfully in all aspects of learning a foreign language. I feet it is particularly significant for listening. 展开更多
关键词 LISTENING anxiety creation of non - ANXIETY environment skills and process focus COUNSELLING corner exposure to authentic English
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Chemical Interaction UO2Cl2 with α-and β-Amino Acids in Aqueous and Organic Solution
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作者 Aibassov Erkin Zhakenovich Kenzhaliev Bagdaulet Kenzhalievich2 +4 位作者 Tussupbaev Nessipbay Kuandykovich Berkinbaeva Ainura Chukmanova Marzhan Iskhakova Renata Bulenbayev Maxat Zhumabaevich 《Journal of Chemistry and Chemical Engineering》 2014年第7期751-756,共6页
This paper presents the results of the search of biologically active uranium compounds such as amino acids. We first received and examined X-ray and IR (infrared radiation) spectroscopy of uranium complexes with α-... This paper presents the results of the search of biologically active uranium compounds such as amino acids. We first received and examined X-ray and IR (infrared radiation) spectroscopy of uranium complexes with α- and β-amino acids in aqueous and organic solution. We proposed a method for direct synthesis of complex organic compounds of uranium chloride UO2Cl2 with α- andβ-amino acids for the synthesis of drugs for the treatment of cancer. 展开更多
关键词 X-ray and IR spectroscopy bioorganic chemistry of uranium synthesis of complex organic compounds of UO2Cl2 with α- and β-amino acids.
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不分散低固相钻井液在车排子地区铀矿绳索取心钻进中的应用研究
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作者 孟祥森 蔡顺山 董瑞 《铀矿地质》 CAS CSCD 2023年第4期700-706,共7页
准噶尔盆地车排子地区是近年来可地浸砂岩型铀矿找矿的主要地区。但是通过最近几年车排子勘探区的钻探施工情况来看,该区域内地层较为复杂,区内广泛分布有泥页岩、松散砂砾岩等强水敏、不稳定地层。在区内钻探施工中,易发生岩层水化膨... 准噶尔盆地车排子地区是近年来可地浸砂岩型铀矿找矿的主要地区。但是通过最近几年车排子勘探区的钻探施工情况来看,该区域内地层较为复杂,区内广泛分布有泥页岩、松散砂砾岩等强水敏、不稳定地层。在区内钻探施工中,易发生岩层水化膨胀、孔径缩小、孔壁坍塌等复杂情况。而钻井液的性能是实现复杂地层顺利钻进的关键指标,在车排子勘探区钻探施工中使用传统细分散钻井液面临着岩心采取率低、地质效果差、回次进尺短和钻探效率低等问题。文章针对车排子勘探区的地层特点和钻探施工中存在的问题,通过相关钻井液文献调研和现场实验,研究并优选出了一套新型低固相不分散钻井液体系、配置与维护技术。该钻井液以广谱护壁剂和磺化沥青粉为核心材料,具有配置维护简单、流动性好、失水量低和所形成泥饼薄而强韧的特点。在2022年的铀矿钻探中,采用该钻井液体系,结合电动直驱钻机在车排子勘探区开展了绳索取心钻进实验,3口试验钻孔达到安全、优质和高效完孔的试验目标,为今后该地区类似钻孔的钻探施工提供借鉴与指导意义。 展开更多
关键词 绳索取心 不分散低固相钻井液 准噶尔盆地 可地浸砂岩型铀矿
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基于非支配多目标优化方法的铀尾矿砂覆盖材料优选
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作者 邓年彪 丁德馨 《铀矿冶》 CAS 2023年第4期47-52,共6页
铀尾矿砂覆盖材料优化选择对铀矿山尾矿砂治理有着重要意义。通过构建铀尾矿砂覆盖层氡浓度分布模型,采用单层和三层覆盖层材料,以氡析出率和综合成本为决策目标构建了多目标决策模型,基于多目标非支配排序方法,寻找可行方案的最优解。... 铀尾矿砂覆盖材料优化选择对铀矿山尾矿砂治理有着重要意义。通过构建铀尾矿砂覆盖层氡浓度分布模型,采用单层和三层覆盖层材料,以氡析出率和综合成本为决策目标构建了多目标决策模型,基于多目标非支配排序方法,寻找可行方案的最优解。对于铀尾矿砂,若采用单层覆盖材料,只有黏土、水泥砂浆和沥青3种材料能够在合理厚度范围内满足氡析出率国标限值要求;与单层覆盖材料相比,三层覆盖层材料外的氡析出率满足国标限值要求,且综合成本降低了75.9%。 展开更多
关键词 铀尾矿砂 覆盖材料 非支配多目标优化方法 氡析出率
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我国非铀矿山放射性职业病危害防治与监管的思考 被引量:9
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作者 古晓娜 刘占旗 +1 位作者 战景明 刘红 《辐射防护》 CAS CSCD 北大核心 2020年第3期181-185,共5页
非铀矿山是指不以生产铀为主要目的各类矿山。我国部分非铀矿山井下氡污染水平高,氡致井下矿工人均年有效剂量接近或超过职业照射年有效剂量限值,但对于非铀矿山的放射性职业病危害防治和监管尚缺乏具体实施办法。基于非铀矿山放射性职... 非铀矿山是指不以生产铀为主要目的各类矿山。我国部分非铀矿山井下氡污染水平高,氡致井下矿工人均年有效剂量接近或超过职业照射年有效剂量限值,但对于非铀矿山的放射性职业病危害防治和监管尚缺乏具体实施办法。基于非铀矿山放射性职业病危害防治和监管的需要,本文就非铀矿山放射性职业病危害防治的工作重点、非铀矿山工作场所氡活度浓度控制值的确定等几个关键问题进行了思考和探讨,并提出了相应的对策和建议。 展开更多
关键词 非铀矿山 放射性职业病危害 监管 思考
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氨基酸与钠离子非共价键相互作用的电喷雾质谱研究 被引量:3
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作者 吴胜明 杨松成 +6 位作者 王杰 王鸿丽 刘炳玉 李爱玲 何昆 魏开华 张学敏 《分析测试学报》 CAS CSCD 北大核心 2004年第z1期66-67,共2页
  实验研究中常常观察到钠离子与一些多肽或蛋白质有较强的非共价键结合能力,这种非共价键相互作用可能与生物的一些功能和活性有关.为了进一步了解这一结合作用,我们应用电喷雾质谱研究了常见的20种氨基酸与钠离子在溶液中的非共价...   实验研究中常常观察到钠离子与一些多肽或蛋白质有较强的非共价键结合能力,这种非共价键相互作用可能与生物的一些功能和活性有关.为了进一步了解这一结合作用,我们应用电喷雾质谱研究了常见的20种氨基酸与钠离子在溶液中的非共价键相互作用.实验研究中发现脯氨酸和苯丙胺酸与钠离子有较强的非共价键结合能力.…… 展开更多
关键词 Sodium ion Amino acids non - covalent interaction ESI - MS
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零价铁处理含铀废水的试验研究 被引量:25
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作者 赵素芬 史梦洁 +1 位作者 安小刚 贺彩婷 《工业水处理》 CAS CSCD 北大核心 2011年第7期71-73,77,共4页
就零价铁处理含铀废水进行了试验研究,考察了pH、震荡时间、静止时间、铁的投加量等因素对铀去除率的影响,得到了最佳实验条件。通过试验对比了铁粉和废铁屑对铀废水的处理效果,发现废铁屑比铁粉对铀的去除率更高。最后分析探讨了铁粉... 就零价铁处理含铀废水进行了试验研究,考察了pH、震荡时间、静止时间、铁的投加量等因素对铀去除率的影响,得到了最佳实验条件。通过试验对比了铁粉和废铁屑对铀废水的处理效果,发现废铁屑比铁粉对铀的去除率更高。最后分析探讨了铁粉和废铁屑对废水中铀的去除机理,指出零价铁对废水中铀的去除符合Langmuir吸附规律。 展开更多
关键词 含铀废水 零价铁 吸附
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金矿等非铀矿山开采过程中氡及其子体的防护 被引量:2
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作者 杜娟 马国学 《黄金科学技术》 CSCD 2013年第2期61-64,共4页
金矿等非铀矿山开采过程中存在放射性污染的问题。阐述了氡及其子体对作业人员可能产生的危害,针对氡气扩散运移机制的不同,提出相应的防护措施。通过合理调整地下通风、设置实物屏障、采用化学吸附及安装高效空气过滤器等手段控制氡的... 金矿等非铀矿山开采过程中存在放射性污染的问题。阐述了氡及其子体对作业人员可能产生的危害,针对氡气扩散运移机制的不同,提出相应的防护措施。通过合理调整地下通风、设置实物屏障、采用化学吸附及安装高效空气过滤器等手段控制氡的扩散和渗流,从而减少矿井中氡的浓度。通过对矿井中的氡及其子体浓度进行监测,加强人员防护及矿井管理,可使作业人员所受的放射性伤害尽可能低。 展开更多
关键词 氡及其子体 放射性 防护 非铀矿山
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中子测量技术在核保障中的应用 被引量:14
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作者 蒙延泰 王效忠 祝利群 《核电子学与探测技术》 CAS CSCD 北大核心 2008年第4期707-711,716,共6页
中子测量技术是核保障领域非破坏性分析技术中重要方法之一。利用该技术结合同位素组成信息可以对铀、钚材料进行定量测量。本文简述了该技术测量原理、测量分析方法以及一些常见用于核保障中的测量设备。
关键词 核保障 非破坏性分析 中子测量技术
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铀标样的无损测量检验 被引量:5
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作者 蒙延泰 王效忠 +3 位作者 贾向军 许小明 李泽 张其欣 《原子能科学技术》 EI CAS CSCD 北大核心 2007年第1期121-124,共4页
用有源阱型中子符合计数器(AWCC)装置和JSR-12符合计数器对为有源符合中子无损测量而研制的铀标样首次进行试用性检验。测试了32个样品,其中,质量为20 g的样品24个、40 g样品4个及80 g样品4个。20和40 g样品的标准合成不确定度约为2%,8... 用有源阱型中子符合计数器(AWCC)装置和JSR-12符合计数器对为有源符合中子无损测量而研制的铀标样首次进行试用性检验。测试了32个样品,其中,质量为20 g的样品24个、40 g样品4个及80 g样品4个。20和40 g样品的标准合成不确定度约为2%,80 g样品的标准合成不确定度在2%以内,大多数样品间的相对比值与称重给出的结果一致。 展开更多
关键词 无损测量 有源阱型中子符合计数器 符合中子 铀标样
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