示踪元素
示踪元素的相关文献在1984年到2022年内共计49篇,主要集中在地质学、化学、地球物理学
等领域,其中期刊论文43篇、会议论文6篇、专利文献25285篇;相关期刊39种,包括中学生数理化(高二高三版)、考试:高考理科版、四川体育科学等;
相关会议6种,包括2016中国环境科学学会学术年会、中国核学会2011年年会、2006薄板坯连铸连轧国际研讨会等;示踪元素的相关文献由110位作者贡献,包括吕建权、周英超、李从先等。
示踪元素—发文量
专利文献>
论文:25285篇
占比:99.81%
总计:25334篇
示踪元素
-研究学者
- 吕建权
- 周英超
- 李从先
- 杨守业
- 田志红
- 蔡开科
- 高耀明
- 魏军
- 魏祖康
- Ann Jochens
- DEFUCHEN
- Damien GABOURY.
- Dominique GENNA
- Giovanni Verlini
- Giusti
- Klaus Mayer
- Lorenzion
- NIANQINGLIU
- ROBERTO TORRA (Centro de Geociencias Aplicadas Universidad Nacional del Nordeste. Avda. Las Heras 727 3500 RESISTENCIA Chaco Argentina)
- W.Duedall
- 万国江
- 乔秀梅
- 亨利C.卢卡斯基
- 侯红
- 凌洪飞
- 刘昌实
- 刘洁生
- 刘润藻
- 刘高勇
- 刘高勇1
- 吕明
- 吴小艾
- 吴红波
- 孙智敏
- 孙芝兰
- 宁先进
- 宋文明
- 尹毅
- 崔力
- 常乃环
- 干国梁
- 庄庆祥
- 康洞国
- 张从福
- 张国茂
- 张峡
- 张文兴
- 徐国庆
- 慕康治
- 曲艺
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李鹏;
王尹军;
银燚海;
鲁皖;
吴红波
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摘要:
为提高炸药示踪元素特征X射线的激发效果,采用了几种滤光片放置于X光管原级X射线出射端口,比对测试了对炸药示踪元素特征X射线激发效果的影响。结果表明:采用Cu片、Mo片作为滤光片,都有利于炸药示踪元素特征X射线的激发;在单独使用时,Mo片对炸药示踪元素特征X射线的激发效果优于Cu片;在Cu片和Mo片组合使用时,0.5 mm厚的Cu片与0.1 mm厚的Mo片(原级X射线先穿过Cu片再穿过Mo片)组合激发效果最好。
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摘要:
为评估环境污染对我国人群健康的影响,环境健康调查是必不可少的-项工作,在环保法、土十条等多项文件中被提起.然而我国具体的环境健康评估方法和标准却较少,为弥补这-空白,环保部下达了多项标准编制任务.经过两个月的征求意见期,环保部终于正式发布《儿童土壤摄入量调查技术规范示踪元素法》.本标准规定了儿童土壤摄入量调查的工作程序、调查内容、调查方法和技术要求.本标准适用于以铝、铈、钪、钒和钇为示踪元素,采用示踪元素法对3-17岁人群开展的土壤摄入量调查.
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宋文明
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摘要:
Geothermal water in high-temperature and high-pressure environments slowly infiltrates and migrates through fissured rocks to achieve a new thermal and dynamical balance conducive to dissolution, resulting in wall rock alteration. In the surrounding rocks, new substances are dissolved in the water, which enables the chemical indicators of geothermal water to be different from those of the surrounding environmental water, as shown by the fact that the values of F, SiO2 , and pH are much larger in geothermal water than in environmental water. We used the three indicators mentioned above as tracer elements to search for geothermal water in the Paoshouying hot spring area, in Dandong City. The results show that this method can explicitly define the boundaries of geothermal regions, narrow down the investigation targets, and reduce the original workload and capital investment.%地热水在高温高压的环境下,在岩石的裂隙中缓慢地渗透、运移,达到了有利溶解的新热动力平衡,致使围岩发生蚀变,围岩中有新的物质溶入水中,使地热水化学指标与周围环境水有明显的区分特征,表现为F-、SiO2、pH值3项指标明显高于环境水。以上述3项指标作为示踪元素,在丹东市炮守营温泉区寻找地热水,结果显示,该方法可明确界定地热区域的范围,缩小勘查目标,降低原有的工作量和资金投入。
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乔秀梅;
郑无敌;
高耀明
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摘要:
惯性约束聚变内爆物理研究中,示踪元素X光谱线诊断方法是推测内爆压缩温度、密度以及燃料混合的有效办法,因此,对示踪元素X光发射的规律及其与内爆过程的关系的研究非常必要,有助于通过谱线发射特征诊断内爆状态。以SGIII原型装置的实验条件下的内爆过程为例,对内爆靶丸示踪元素Ar发射X光谱线进行了理论模拟。研究了谱线自吸收效应、Ar掺杂浓度、等离子体空间分布不均匀等对Ar发射的X光谱线分布的影响。还对Ar发射X光谱线强度的时间演化及其与内爆过程的关系进行了研究。结果表明,增加掺杂浓度,谱线强度增强,但是谱线自吸收效应的影响也明显增强。示踪元素Ar发射的X光谱线强度的峰值时刻与中子产生速率的峰值时刻接近(前者延迟约15 ps)。高温、高密度及合适的电离度是谱线发射的3个条件,在X光谱线发射的峰值时刻,由于燃料芯部Ar等离子体过电离, Ar等离子体发射的X光谱线的空间峰值区域靠近燃料边界区域,占燃料总体积56%的薄壳(厚度∼4µm),其发射的X光谱线强度约为总强度的72%。因此,对发射谱线分布拟合得到的空间平均的等离子体温度、密度主要反映这一区域的等离子体状态。%As the X-ray spectrum of tracer in inertial confinement fusion implosion target is usually used to infer electron temperature, density, and the mixture of fuel and shell, it is necessary to study the relation between the characteristics of X-ray emission spectrum and the implosion process, which is helpful for inferring the implosion status. Under the condition of SGIII prototype, approximately 0.5% atomic percent of Ar atoms are doped in an indirectly driven implosion target, X-ray spectrum of Ar is numerically simulated. In this article, the influences of line re-absorption effect, tracer concentration, and profile of fuel plasma state on the emission spectrum are studied. The relation between the temporal evolution of the emission spectrum and the implosion process is also investigated. It is found that as the tracer concentration increases up to ∼ 1%, the X-ray intensity is enhanced, but the influence of line re-absorption becomes severe. Temporal evolution shows that the peak time of Ar X-ray intensity is almost the same as that of neutron production (the former delays about 15 ps, which usually cannot be resolved). As is well known, the strong line emission occurs in the plasma with high temperature, high electron density, and proper ionization. The detailed analysis shows that at the peak emission time, as the core Ar plasma is over ionized, the main X-ray line emission region is located near the boundary region of the fuel, and this thin shell, whose thickness is about 4 µm and whose volume accounts for 56%of the total fuel plasma volume, emits the X-ray whose intensity is about 72%of the total line intensity. Therefore, the space-averaged plasma temperature and density, which are obtained by fitting the emission spectrum, mainly reflect the plasma state in this region.
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钟川龙;
辜玲慧;
吴小艾;
范成中
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摘要:
The trace elements are introduced into the Migrastatin core and used it as the targeted a-rngents for cancer diagnosis and treatment. 9- Methanesulfonate of Migrastatin core was synthesized fromrn(E)-[(Z) -5-( t-butyldimethylsilyloxy) -6-methoxy-2,4-dimethylocta-2,7-dienyl ] hepta-2,6-dienoaternby a three-step reaction of deprotection of TBS, esterification and olefin metathesis in total yield ofrn15.3%. The structure was characterized by 1H NMR and ESI-MS.%为了将示踪元素引入Migrastatin母核并用于肿瘤诊断和靶向治疗,以2,6-二烯庚酸-5-(叔丁基二甲硅氧基)-6-甲氧基-2,4-二甲基-2,7-二烯酯为起始原料,经过脱TBS保护、酯化和烯烃复分解反应,成功地合成了Migrastatin母核9-甲磺酸酯,总收率15.3%,其结构经1H NMR和ESI-MS表征.
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高耀明;
李蒙;
李永升;
康洞国;
李沄生
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摘要:
激光聚变内爆实验中,在燃料中掺杂少量比例的中高Z材料,用X光光谱和X光成像测量掺杂元素的发射信息,诊断燃料的温度、密度和压缩形状.用辐射流体力学数值计算和X光成像后处理程序综合分析方法,给出了内爆靶丸优化设计,并讨论示踪材料在X光诊断中的作用.结果表明:在靶丸燃料D2中掺原子分数约1.0%的氩,内爆压缩中子产额下降约15%.由于氩线发射使整个燃料区X光发射强度提高约50倍,X光成像区域增大约30%,有利于实验诊断测量燃料芯部.为了测量燃料区的边界,在CH内壳层涂厚度0.05μm的硫,分析表明硫Ly-α单能成像大小与流体力学计算的燃料区大小一致,可用于诊断燃料最终压缩界面.数值分析结果得到了神光Ⅱ间接驱动内爆物理相关实验的验证.%Diagnosing conditions of compressed fuel is a critical aspect of ICF capsule implosion experiments. A common diagnostic technique is to add a small concentration of high- or mid-Z dopant to the fuel, and measure the emission from the dopant either spectroscopically or by imaging. With radiative hydrodynamic simulations and post-processing of X-ray imaging for implosions, the designs of the fuel capsule are optimized, and the effects of tracer in fuel on X-ray diagnostics of implosion are analyzed.The results show that for the capsule of D2 fuel doped with argon at about l% atomic fraction, although the implosion yield reduces by about 15%, the X-ray intensity of fuel increases by 50 times and the size of X-ray imaging is enlarged by about 30%,which is beneficial to the diagnosis of the fuel core. For the capsule with 0.05μm thick sulfur coated inside the CH shell, the dimensions of sulfur Ly-α monochromatic X-ray imaging accord with those of the fuel region, and thus the compressed boundary of fuel can be deduced. Above analysis results have been validated by Shenguang Ⅱ implosion experiments.
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马瑾;
潘丽波;
林春野;
王贝贝;
段小丽;
侯红
- 《2016中国环境科学学会学术年会》
| 2016年
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摘要:
为了获取我国儿童通过手口接触导致的土壤摄入率数据,我们在湖北省武汉市和五峰县2~17岁儿童中,按照一定的规则随机挑选了120名儿童(男孩58名,女孩62名),采用擦拭法采集了手尘样品.我们对手尘样品进行了称重,并分析了其中的示踪元素(Ce、Y、V).结果显示,儿童的手尘重介于6.35至85.42 mg,中位值20.62 mg;通过三种示踪元素Ce、Y和V计算出的儿童理论手尘量的中位值分别为1.07、1.00和0.92 mg.不同年龄段(幼儿园、小学和中学)儿童的手尘量存在较大差别,小学儿童的手尘量明显高于其他两个年龄段儿童.另外,男孩的手尘量高于女孩,农村儿童的手尘量高于城市儿童.幼儿园、小学和中学儿童通过手口接触导致的土壤摄入率分别为1.79、2.12和0.49 mg/d.
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魏军;
田志红;
蔡开科;
周英超;
魏祖康;
吕建权
- 《2006薄板坯连铸连轧国际研讨会》
| 2006年
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摘要:
通过在炼钢和连铸过程的各个阶段加入不同的示踪元素,采用金相观察、大样电解、电子探针及扫描电镜等多种方法对CSP流程低碳铝镇静钢中非金属夹杂物行为进行了调查研究,找出了夹杂物的来源、数量及分布的变化规律.对CSP热轧板表面缺陷分析发现缺陷主要是翘皮和麻面,翘皮主要是由夹杂物引起的;以CSP热轧板生产的冷轧板表面缺陷主要是孔洞和翘皮缺陷,缺陷主要是由夹杂物引起的.在相同的钢种和板厚条件下,CSP热轧板卷生产的冷轧板缺陷率比传统工艺热轧板卷生产的冷轧板缺陷率高62%.对结晶器EMBR实际使用效果研究表明,无电磁制动时,结晶器液面波动为13~15mm,使用电磁制动时,结晶器液面波动为7~9mm,钢中T[O]降低了40%,大型夹杂物减少了61%.应用CFX软件数学模拟了电磁制动及无电磁制动情况下的CSP结晶器流场.模拟结果表明,在邯钢现行工艺条件下,结晶器使用电磁制动后,结晶器弯月面钢水中心线速率降低了约3倍,湍动能降低了2倍左右.结晶器钢水流动减缓,结晶器钢水卷渣明显减轻,薄板坯洁净度明显改善.
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魏军;
田志红;
蔡开科;
周英超;
吕建权;
魏祖康
- 《2005中国钢铁年会》
| 2005年
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摘要:
本文通过在炼钢和连铸过程的各个阶段加入不同的示踪元素,采用金相观察、大样电解、电子探针及扫描电镜等多种方法对邯钢CSP流程低碳铝镇静钢中非金属夹杂物行为进行了调查研究,找出了夹杂物的来源、数量及分布的变化规律.对CSP热轧板表面缺陷分析发现缺陷主要是翘皮和麻面,翘皮主要是由夹杂物引起的;以CSP热轧板生产的冷轧板表面缺陷主要是孔洞和翘皮缺陷,缺陷主要是由夹杂物引起的.在相同的钢种和板厚条件下,邯钢CSP热轧板卷生产的冷轧板缺陷率比传统工艺热轧板卷生产的冷轧板缺陷率高62﹪.对结晶器EMBr实际使用效果研究表明,无电磁制动时,结晶器液面波动为13~15mm,使用电磁制动时,结晶器液面波动为7~9mm,钢中T[O]降低了40﹪,大型夹杂物减少了61﹪.应用CFX软件数学模拟了电磁制动及无电磁制动情况下的CSP结晶器流场.模拟结果表明,在邯钢现行工艺条件下,结晶器使用电磁制动后,结晶器弯月面钢水中心线速率降低了约4倍,湍动能降低了3倍左右.结晶器钢水流动减缓,结晶器钢水卷渣明显减轻,薄板坯洁净度明显改善.
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