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    Catalyst Replacement of the First Synthesis Converter R5 of Braun Ammonia Plant in the Environment of Nitrogen
    布朗工艺氨合成塔(R5)氮环境下催化剂更换
    Introduction of the first synthesis of new superheavy nuclei 289 114 and 293 118 in reactions of 48 Ca+ 244 Pu and 86 Kr+ 208 Pb.
    介绍了在充气分离器上用244 Pu(48 Ca,3n)289114和208 Pb(84 Kr,n)293118反应分别合成超重核289114和293118的新发现.
    The results indicate that PANI is main component and the content of nm-MnO_2 is very low in the PANI/nm-MnO_2 composite obtained by the first synthesis method.
    研究表明:第一种加料方式得到的PANI/nm MnO2中nm MnO2的含量很低;
    The first synthesis of ethyl (+)-(2R,3S,4S,5S)-4,5-epoxy-2,3-dihydroxy-6-methyl heptanoate (5) and ethyl (-)-(2R,3S,4R,5S)-2,3,4,5-tetrahydroxy-6-methyl heptanoate (11) was achieved and the key steps involved the construction of chiral carbon centers by the asymmetric epoxidation and dihydroxylation.
    以不对称环氧化和双羟化反应为构筑手性碳的关键步骤,首次合成了(+)-(2R,3S,4S,5S)-6-甲基-4,5-环氧-2,3-二羟基-庚酸乙酯(5)和(-)-(2R,3S,4R,5S)-6-甲基-2,3,4,5-四羟基-庚酸乙酯(11).
    First Synthesis of Three Naturally Occurring O-Prenylated Phenylpropanoids
    三种O-异戊烯基苯丙素类天然产物的首次合成
    Seven compounds were designed and synthesized,among them,four compounds are natural products. The natural product-isoquercetin,quercetin-3-a -arabinofuranoside,quercetin-3-O- -xylopyranoside and quercetin-3-O-ethers were first synthesis.
    天然产物远志昔(ISoquercetrin),棚皮素一3-O-a一D一陕lids阿拉i糖示棚皮素一3-O-D一D血卜南木糖及硼皮素-3D-醚化物的合成方法未见文献报道。
    Ultrasound was used during the first synthesis reaction, i.e. reflux reaction, inBPT synthesis process.
    使用超声辐射作用于合成 BPT 的第一步回流反应。
    The research result about an influence of ultrasound is the same as theresult of the experiment in first synthesis reaction.
    通过对有无超声辐射下的实验结果对比发现,超声对本反应的促进作用主要表现在对传质过程的强化、促进作用。
    Since the first synthesis of an amorphous alloy in Au-Si system by rapid solidification in 1960, a great number of amorphous alloys have been prepared up to date.
    自1960年利用急冷的方法首次制备出Au-Si非晶合金薄带后,时至今日非晶合金材料已有很大的发展。
    First synthesis domestic and international scholars' study on the family enterprise, technology innovation ability, and then propose the view of this article.
    综合国内外学者对家族企业问题、技术创新能力要素的研究,提出本文的观点。
    Since the first synthesis aperture radar (SAR) satellite Seasat was successfully implemented to observe the earth in 1978, SAR technology continued to develop rapidly. At present, US, Japan and European countries have been investing massive human and material resources in this field of research.
    自1978年第一颗合成孔径雷达卫星Seasat成功地实施了合成孔径雷达对地观测后,合成孔径雷达(SAR)技术取得了飞跃式的发展,目前国际上美、日及欧洲各国等相继在该领域投入大量的人力、物力发展合成孔径雷达(SAR)技术。
    "The first synthesis" mainly means two aspects, which are the esthetic anxiety and the esthetic dimensionality of anxiety.
    “第一综合”主要表现为两方面,即审美的恐惧和恐惧的审美之维。
    The physics idea and technical approach on synthesis and study of new refractoryheavy neutron--rich nuclides are introduced. The first synthesis and identification of new isotopes~(185)Hf and ~(237)Th are reported. A plan for coming work is presented.
    本文介绍了高熔点重丰中子区新核素合成和研究的物理思想和技术路线及新同位素~(185)Hf和~(237)Th的首次合成及鉴别,并提出了今后的设想。
    CONCLUSION: The first synthesis of sarmentosin(1), a potent natural GPT lowering agent, was achieved.
    结论:首次完成了天然产物垂盆草苷的人工合成
    This paper presents the details of the first synthesis converter R5 catalyst replacement in Jinxi Natural Gas Chemical Co, Ltd, and summarizes and discusses the problems occurred in the process of catalyst replacementSome suggestions and measures are given to treat the problem
    详细介绍锦西天然气化工有限责任公司布朗合成氨工艺第一合成塔R5催化剂更换情况,对实际更换过程中出现的问题加以总结,并提出解决问题的措施与办法。
    The first synthesis of three naturally occurring phenylpropanoids, boropinol A (1), boropinal C (2) and boropinic acid (3), is described. The reaction of vaniline (4) with prenyl bromide in DMF gave the O prenylated product 5 in 84% yield. Condensation of 5 with Ph 3PCHCO 2Et in DME produced ester 6 in 52% yield.
    以香草醛为起始原料 ,经O 异戊烯基化、Wittig反应、水解、还原、氧化等反应步骤 ,首次合成了三种苯丙素类天然产物boropinolA (1) ,boropinalC (2 ) ,boropinicacid (3) .
    A new synthesis method-at polymer synthesis of 15-crown ester-5 by studied in this paper. The first synthesis was addition reaction of polystyrene allyloxtmethylate with tetraethylene glycol and NBS. The second synthesis was cyclization of the first synthetic product.
    本研究给出高分子冠醚化合物的一种新合成方法———用烯丙氧基化的聚苯乙烯作为合成冠醚的前体,在NBS存在下与三缩四乙二醇加成,然后关环生成聚合物支载的15-冠-5。
 

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