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The structure water is dehydrated completely as the temperature is over 1,100 K, the characteristic peak (3,580 cm-1) of the structure water disappears completely, the characteristic peak related to Si-Onb stretching vibration becomes 855 cm-1, which shows that primary Q1 of the hemimorphite is returned to Q0 (i.e [SiO4] ), and which means that the hemimorphite is completely transformed to willemite.
当升温达1 100 K以上,结构水的特征谱峰(3 580 cm-1)消失,与Si-Onb对称伸缩振动对应的特征拉曼谱峰变为855 cm-1,这标志着异极矿原有的Q1结构已完全转变为硅锌矿的Q0结构([SiO4]结构),也就是说异极矿已完成向硅锌矿的转变。关键词:异极矿;原位拉曼光谱;测试;相变;高温
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In LNG factories, there were many disadvantages like the cost will be extremely high because huge quantities of isopentane had to be used in the previous debenzene technology by use of the similarity and compatibility theorem.
LNG工厂原来的脱苯工艺是利用"相似相溶"原理,用异戊烷脱苯,但存在异戊烷消耗量太大,成本较高等诸多弊端。
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The microwave-assisted extraction and Florisil solid phase extraction conditions were optimized. Under the optimum condition, the recoveries of 18 organochlorine pesticides (α-HCH,β-HCH,γ-HCH,δ-HCH, heptachlor, aldrin, heptachlor epoxide, endosulfan Ⅰ, p, p'-DDE, dieldrin, endrin, endosulfan Ⅱ, p, p'-DDD, o, p'-DDT, endrin aldehyde, endosulfan sulfate, p, p'-DDT, methoxychlor) were
优化了微波萃取和固相萃取柱净化条件,在最优条件下18种有机氯农药(α-HCH、β-HCH、γ-HCH、δ-HCH、七氯、艾氏剂、环氧七氯、硫丹Ⅰ、p,p'-DDE、狄氏剂、异狄氏剂、硫丹Ⅱ、p,p'-DDD、o,p'-DDT、狄氏剂、异狄氏剂醛、硫丹硫酸酯、p,p'-DDT、甲氧滴滴涕)的回收率在
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The conclusions were as follows: theνO-H andνC=O IR absorption maxima shifted towards higher wave numbers after imprinting 17β-estradiol on TFMAA-co-TRIM copolymer with the red shift of theνO-H groups being apparent after precipitation polymerization for 16h while that forνC=O groups being observed after polymerization for 24h. A strong interaction between TFMAA and 17β-estradiol was confirmed by the high selectivity for 17β-estradiol, as indicted by the values of the separation factor of isomers of 17β-estradiol/17α-estradiol (2.28) and the imprinted factor (3.01). Particle diameter of TFMAA-co-TRIM polymer was between 300 nm and 1.5μm, which suited well for solid phase sorbent throughout at low column pressure. The recognition of imprinting TFMAA-co-TRIM polymer for sterol molecules was driven by enthalpy eluted with acetronitile, and low temperature was in favor of the separation of sterol structure analogues on imprinting column. TFMAA-co-TRIM polymer possessed of determinate anti-heat stability, with melting point beginning at 255.84℃, Tp=257.40℃, control TFMAA-co-TRIM polymer and imprinting TFMAA-co-TRIM polymer were respectively decompounded at 267.79℃and 343.11℃, and solid micro-extraction noddle prepared by the special polymerization also showed definite recognition for 17β-estradiol by GC/MS detecting at 270℃. By selection of various washing and elution solvents, elution reagents of close polymerization system were of more advantage in template molecules retention and recognition on molecularly imprinted solid phase extraction column. At a certain extent, progesterone, 17α-estradiol, 17β-estradiol and 4-androstene-3, 17-dione could be intercepted on the MISPE column. Especially, MISPE had high selectivity for progesterone, and imprinting TFMAA-co-TRIM polymer could achieve adsorption balance within 50 min by absorption kinetics test for 17β-estradiol. However, MISPE column showed better selectivity and enrichment property for 17β-estradiol than C18 and CSPE columns according to the data from HPLC and GC/MS analyses. Recovery of 17β-estradiol on MISPE column was up to 85.5% while when prime extracting solution of milk powder was sampled, the recovery of CSPE and C18 columns were 43.7% and 30.7%, respectively.
通过研究阐明:紫外聚合产物TFMAA-co-TRIM中的νO-H振动吸收峰在聚合16h后红移,νC=O振动吸收峰在聚合24h后红移;TFMAA-co-TRIM对雌二醇异构体的印迹因子达到了3.01,α为2.28,优于其它功能单体参与得到的聚合物识别特性;TFMAA-co-TRIM聚合物粒径介于300 nm至1.5μm之间,作为色谱固定相具有良好的通量和低的柱压;在乙腈流动相中,TFMAA-co-TRIM分子印迹固定相的分离过程主要被焓驱动,低温有利于分子印迹固定相分离甾醇结构类似物;TFMAA-co-TRIM分子印迹聚合物在255.84℃时开始熔融,Tp=257.40℃,聚合物CP的降解温度在267.79℃,MIP降解温度在343.11℃,制备的固相微萃取头初步经GC/MS 270℃的耐热性测定;不同的洗提溶剂筛选证明了选择接近聚合溶剂的洗脱体系更有利于MISPE发挥识别效应;分子印迹固相萃取柱对孕酮、17α-雌二醇、17β-雌二醇和雄烯二酮都具有不同程度的保留特性,可作为此类化合物的吸附材料,特别对孕酮强保留的富集特性,可作为孕酮的选择性识别吸附剂,其分子印迹聚合物对17β-雌二醇的吸附动力学测定显示在50 min内基本达到吸附平衡,具有作为传感器核心敏感材料的潜力;对比萃取奶粉中17β-雌二醇性能,MISPE柱比非分子印迹固相萃取柱和C18柱具有更高的保留,回收率依次为85.5%,43.7%和30.7%。
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The isothermal DSC analysis showed that the Ruleless Coring Mechanism, Diffusion Mechanism and Phase Interface Mechanism would control the reaction of isocyanate and cellulose with different MC. The key effects of complicated mechanism rest with water transference and fast reaction of isocyanate and water.
等温DSC 研究揭示含水纤维素与异氰酸酯反应时,存在无规成核机理、扩散机理和相界面机理等多种情形,水分迁移作用和异氰酸酯与水反应速率较快是致使异氰酸酯与含水纤维素的反应机理复杂的关键。
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A series of study methods which can not research in this field begin to exert important affection. On the basis of the previous research, the following major innovative work was carried out in this dissertation.(1) Several methods including fluorescence spectra, CD and FT-IR specta methods were used to study the interaction of isoquinoline alkaloid、isoflavones and Rhein with serum albumin, and the results from every method was in good agreement;(2) The binding constants、the numbers of binding site、the binding region and the interaction force involving in the interaction of drugs and serum albumin were confirmed by Scatchard equation and Vant Hoff equation.
基于研究生物大分子与小分子相互作用具有极其重要的意义,本博士论文在前人工作的基础上,主要进行了以下几方面的创新性研究:(1)利用荧光光谱法、圆二色谱法、红外光谱法以及分子模拟等多种方法相结合研究了异喹啉类生物碱,异黄酮类化合物以及大黄酸与人血清白蛋白的相互作用,获得了准确一致的信息;(2)根据Scatchard方程和Vant Hoff方程详细研究计算了异喹啉类生物碱以及大黄酸与蛋白质结合机理包括结合常数、结合位点数、结合区域、结合力。
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To further study the chemical constitutes of lipophilic active parts, we prepared Alc95% and Alc50% according to original literature. 20 compounds were isolated by using macroporous resin, silica gel, polyamide, Sephadex LH-20, Rp-18, preparative TLC and preparative HPLC chromato-graphy. The structures of them were elucidated by means of physical and chemical properties, modern spectroscopic analysis techniques—UV、IR、 EI/MS、ESI/MS、〓H-NMR、〓C-NMR、DEPT、HMQC、HMBC. They are nine anthraquinones: chrysophanol (95-1), physcion (95-2), emodin (95-5), aloemodin (95-7), rhein (50-1), sennoside A or B (50-6),ω-hydroxylemodin (95-10), chrysophanol-8-0-β-D-glucoside (95-12), aloemodin-ω-0-β-D-glucoside (95-13); three phenanthaquinones: tanshinone ⅡA (95-3), cryptotanshinone (95-6), tanshinone Ⅰ(95-4); one isoflavone: 7, 3'-dihydroxyl-5' methoxyisoflavone (95-14) and protocaechuic aldehyde (95-9), protocaechuic acid (95-11), astragaloside Ⅳ(50-4), amygdalin (50-5), 2, 3, 5, 4'-tetrahydroxylstilbene-2-0-β-D-glucoside (50-3),-catechin (50-2), cinnamic acid (95-8). Among them, 3'-dihydroxyl-5' methoxyisoflavone (95-14) is a new compound.
经过溶剂萃取、大孔吸附树脂富集、Sephadex LH-20精制、制备TLC及Semi-pre HPLC等手段从中分离了20个化合物,利用理化性质和波谱技术(UV、IR、EI/MS、ESI/MS、〓H-NMR、〓C-NMR、DEPT、HMQC、HMBC)相结合鉴定了它们的结构,分别为9种蒽醌类化合物:大黄酚,大黄素甲醚,大黄素,芦荟大黄素,大黄酸,番泻苷A或B,ω-羟基大黄素(ω-hydroxylemodin),大黄酚-8-0-β-D-葡萄糖苷(chrysophanol-8-0-β-D-glucoside),芦荟大黄素-ω-0-β-D-葡萄糖苷(aloemodin-ω-0-β-D-glucoside);3种菲醌类化合物:丹参酮ⅡA(tanshinoneⅡA),隐丹参酮,丹参酮Ⅰ(tanshinone Ⅰ);1种异黄酮:7,3'-二羟基-5'-甲氧基异黄酮(7,3'-dihydroxy-5' methoxyisofla-vone)以及原儿茶醛,原儿茶酸,黄芪甲苷(astragaloside Ⅳ),苦杏仁苷,2,3,5,4'-四羟基二苯乙烯-2-0-β-D-葡萄糖苷(2,3,5,4'-tetrahydroxylstilbene-2-O-β-D-g1ucoside),Z—儿茶素,桂皮酸。
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Condition optimization for its efficient fermentation was also carried out. The reaction and separation system with the addition of resin HD-8 and the isoeugenol/aquoeus biphasic system of the biotransformation of isoeugenol to vanillin by Bacillus fusiformis CGMCC1347 were set up. The isolation and purification of isoeugenol and vanillin in both systems were studied. The reuse of the immobilized cells in biphasic system was successfully applied.
SW-B9的基础上,对该菌株进行了生理生化特性鉴定以及16S rDNA序列分析,命名为纺锤芽孢杆菌CGMCC1347;继而对该菌株的发酵条件进行了研究,首次建立了纺锤芽孢杆菌CGMCC1347转化异丁香酚生成香草醛的树脂分离耦合体系和异丁香酚—水两相体系,同时对此二体系的底物和产物的分离提取进行了研究,成功实现了两相体系中固定化细胞的反复利用。
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Thirdly, The preparation of 3-aryl-5-substituted-ethenyl isoxazoles and l-isoxazolyl-2-isoxazolinyl substituted-ethenes was developed through 1, 3-dipolar cycloaddition of nitrile oxides,α-alkylation reaction and another 1, 3-dipolar cycloaddition of nitrile oxides based on polystyrene-supported propargyl selenide.
三、从聚苯乙烯负载的炔丙基硒醚出发,经过腈氧化物的1,3-偶极环加成反应、α-烷基化反应和腈氧化物的1,3-偶极环加成反应固相分别合成了3-芳基5-取代--乙烯基异噁唑和1—异噁唑—2—异噁唑啉取代的-乙烯。
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This paper introduces tests of constituents and isomeric compound contents of PXE、PEPE and M/DBT produced by several chemical plant by way of gas chromatography and gas chromatography-mass spectrograph combination , and also gibes some comments on present status and quality control of the insulation oil.
本文介绍了采用气相色谱分析及气质联用分析方法对各厂家生产的PXE、PEPE、M/DBT的组份及其同分异构体的含量进行测定的情况,对绝缘油品质的现状及质量的控制提出了一些见解。关键词:绝缘油;气相色谱;组分分析;同分异构体
- 推荐网络例句
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But we don't care about Battlegrounds.
但我们并不在乎沙场中的显露。
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Ah! don't mention it, the butcher's shop is a horror.
啊!不用提了。提到肉,真是糟透了。
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Tristan, I have nowhere to send this letter and no reason to believe you wish to receive it.
Tristan ,我不知道把这信寄到哪里,也不知道你是否想收到它。