1. Through the experiment of vacuum silicothermic reduction producing metallic strontium, the pure metallic Sr (98.53%, mass fraction) is obtained and the metal yield is 55%.
通过真空硅热法炼锶实验获得纯度为98.53%的金属锶,锶的收得率为55%。
2. Consideridng Rb-Ba-Sr fractionation character and intense deficiency of MREE and using trace element web diagram, the author has revealed the intense magmatic crystallization and differentiation process and pointed out that this process had to do with the compositional variation of biotite and the obvious increase of strontium isotopes.
利用九华山花岗岩体明显的Rb、Ba、Sr变化特征、强烈亏损的中稀土元素特征以及微量元素比值蛛网图和典型的岩石化学变异特征论证了九华山花岗质岩浆的结晶分异作用,探讨了岩浆结晶分异过程对黑云母成分及锶同位素数值的影响,从而指出了岩浆分异作用可能改变I型花岗岩类的黑云母成分标型以及锶同位素初始值的原有特征。
3. This paper is a design on experimental method which is used to detemine ratio of strontium isotopes in carbonate.
本论文的主要工作内容是碳酸盐岩Sr同位素的实验方法的设计。
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4. Objective To discuss the effect of strontium-90 beta plesiotherapy in the treatment of children skin capillary haemangioma.
目的 探讨90Sr-β敷贴治疗儿童皮肤毛细血管瘤的疗效。
5. According to the principle of strontium isotope stratigraphy, we attempt to determine the age of the boundaries for Campanian/Santonian and Maastrichtian/Campanian by 87Sr/86Sr ratios for Gamba section in southern Tibet.
在与国际上同期海相地层锶同位素演化曲线对比的基础上,研究了晚白垩世海相碳酸盐锶同位素组成与主要地质事件的关系;在将本研究锶同位素数据融入到全球中新代海水锶同位素曲线的基础上,综合作出了中新生代海平面变化和锶同位素对照曲线,讨论了全球风化速率,造山事件,气候,海平面变化以及灾变性事件对中新生代海水锶同位素的控制作用;根据锶同位素地层学原理,本研究尝试将碳酸盐锶同位素组成用于海相地层定年上,利用已有的全球海水87Sr/86Sr值-年龄数据库和测试的藏南晚白垩海相碳酸盐的87Sr/86Sr值,确定了岗巴剖面Campanian/Santonian和Maastrichtian/Campanian阶界线,标定了广泛分布于白垩纪的厚壳蛤化石的年龄;本研究还将这些方法推广到了塔里木盆地井下奥陶纪地层的年龄标定,确定了中/上,中/下奥陶统界线,从锶同位素角度获得了古岩溶作用证据,显示锶同位素地层学在解决海相地层对比,年龄确定及在岩溶型油气储层研究中的潜在价值和良好应用前景。
6. The research results are as follows:(1) The halites of Paleogene of Dongpu depression were formed form continental lake water and not from the invasion of sea water. The composition of strontium isotopes was mainly controlled by the silicon aluminum rock with a higher value of 87Sr/86Sr(0.720±0.005(2) The value of δ^34 S(28~33×10^(-3) of Paleogene halites of Dongpu depression was higher than that of the marine evaporate 20×10^(-3, which indicates that the sedimentary environment was closed to sulfate and open to sulfurated hydrogen; (3) The variation of strontium and oxygen isotope compositions show that from the upper Es4 to the upper Es3 member, the paleoclimate was humid in the Dongpu depression, and rainfall gradually increased, which resulted in a decrease of δ^18 O and increase of 87Sr/86Sr; and from the upper Es3 to the Es1 member the paleoclimate became abruptly dry, which resulted in a decrease in rainfall and rapid evaporation.
研究表明:(1)东濮凹陷古近系的盐岩为陆相成因而并非来源于海水的侵人,其湖水锶同位素的主要控制因素为高87Sr/86Sr(0.720±0.005)的壳源硅铝质岩石;(2)东濮凹陷古近系盐岩中的δ^34 S(28~33×10^(-3)普遍偏高且大于现代海相蒸发盐中的δ^34 S20×10^(-3,表明盐类形成时的沉积环境对硫酸盐是封闭的,而对H2S是开放的;(3)锶和氧的同位素变化特征表明:东濮凹陷在由Es4上段向Es3上段过渡时气候较为湿润,降雨量逐渐增大,导致δ^18 O的降低和87Sr/86Sr值的升高;而由Es3上段向Es1段过渡时,气候骤然变得干旱,导致降雨量减小,蒸发量增大。
7. In this test, two new processes are studied on preparation strontium by the vacuum aluminothermy reduction and Al-Sr alloys by molten salt electrolysis.
本文研究了真空铝热还原法生产金属锶和熔盐电解法生产铝锶合金的两种新工艺。
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8. In this test, two new processes are studied on preparation strontium by the vacuum aluminothermy reduction and Al-Sr alloy s by molten salt electrolysis.
本文研究了真空铝热还原法生产金属锶和熔盐电解法生产铝锶合金的两种新工艺。
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9. Ba0.7Sr0.3TiO3 powders are successfully prepared by the hydrothermal process where barium chloride, strontium chloride and titanium chloride are used as raw materials at 240℃ for 10 hours.
利用水热法研究了BST前驱物的初始配比、矿化剂NaOH过量浓度、水热时间和温度等条件对合成Ba0.7Sr0.3TiO3粉体的影响。
10. The SiO2-Al2O3-d catalyst was modified with different metal nitrates. It indicates that cadmium nitrate and strontium nitrate could improve the catalytic activity obviously.
用不同种类、不同浓度的金属硝酸盐,对SiO2-Al2O3-d催化剂进行改性研究,发现Cd(NO3)2和Sr(NO3)2改性后,活性和使用寿命较SiO2-Al2O3-d有所提高,而Mg(NO3)2、Ca(NO3)2、Ni(NO3)2改性后的催化剂,活性反而有所降低。
11. Objective: To investigate the physiological and biochemical effects of strontium on the marine microalga P. subcordiformis.
目的:以亚心形扁藻为材料,在室内条件下研究Sr(上标 2+)胁迫对其生理生化的影响。
12. Strontium(Sr)是什么意思
12. The shape of the solidification segment of a cooling curve can token the features of the Al-7Si alloy melt by combination addition of boron and strontium.
冷却曲线凝固段的整体形状可以表征亚共晶铝硅合金B、Sr联合处理后的熔体状态。
13. Strontium; Sr isotope; Karst water; Underground river
锶元素;锶同位素;岩溶水;地下河
14. Strontium doped lanthanum manganate La_(1-xSr_xMnO_3, LSM is commonly used as ABO_3 type cathode in traditional high temperature solid oxide fuel cells. However, LSM is not suitable to operate in intermediate temperature range, due to the low conductivity and electrochemical activity.
传统的SOFC阴极材料多为钙钛矿结构ABO_3型氧化物,如La_(1-x)Sr_xMnO_3等,这类材料在1000 oC时极化电阻仅为几欧姆,但随着工作温度的降低,其极化电阻猛增到几千欧姆。
15. The contents of strontium-90 in surface seawater in East China Sea and its adjacent region
中国东海及邻近大洋表层海水中的~(90)Sr含量
16. Strontium(Sr)的翻译
16. Effect of Al/Sr Ratio on Properties of Strontium Aluminate Long Lasting Phosphor
锶铝比例对铝酸锶长余辉发光材料性能的影响
17. Geochemical environment of trace element strontium (Sr) enriched in mineral waters A simulation Study on the Accumulation or Added Rare Earth Elements in Aquatic Ecosystem
矿泉水中微量元素锶富集的地球化学环境
18. Preparation and dielectric properties investigation of the fine-grained barium strontium titanate ceramics by a modified sol-gel method
改进的sol-gel工艺制备细晶Ba(0.6)Sr(0.4)TiO3陶瓷及其介电性能的研究
19. Barium strontium titanate ceramics and thick-film preparation by low-temperature sintering
低温烧结制备Ba(0.6)Sr(0.4)TiO3陶瓷及厚膜
20. Barium strontium titanate (Ba_ (0.6) Sr_ (0.4) TiO_3, BST) ceramics and thick films were fabricated using a modified solgel method. Their crystallization process and electrical properties were investigated.
用改进的溶胶凝胶工艺制备Ba0.6Sr0.4TiO3(BST)陶瓷及厚膜,研究它们的结晶情况与电学性能。