共查询到20条相似文献，搜索用时 93 毫秒
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合成了三类取代哌嗪修饰的新型联苯哌嗪化合物,并对这些化合物进行多级电喷雾 离子阱质谱裂解分析。在一级全扫描质谱中发现,三乙胺与4,4′-二甲氧基-5,6,5′,6′-二次甲二氧基联苯-2-甲酸酯-2′-甲酰基-4-取代哌嗪化合物形成[M+101+H]+。实验还发现,结构中有氟原子存在的联苯-2-甲酸酯-2′-甲酰基-4-取代哌嗪化合物更易与钠离子结合形成加钠的准分子离子[M+Na]+。二级质谱说明,4,4′-二甲氧基-5,6,5′,6′-二次甲二氧基联苯-2-甲酸酯-2′-甲酰基-4-取代哌嗪化合物的哌嗪上取代基的不同,对二级质谱的碎片离子形式有显著的影响。 相似文献
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1.调整用油规格发动机用油牌号根据当地气温而定:最低气温在-5～0℃,选用-10号柴油;最低气温在-10～-15℃,选用-20号柴油;最低气温不低于-30℃,选用-35号柴油;最低气温在-40℃左右的高寒区,选用 相似文献
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以机场行李装载机器人为研究对象,对其装载作业中的轨迹规划进行了研究。结合实际需求,对机器人末端轨迹设置关键路径点,建立点到点的运动轨迹。用MATLAB对3-3-5多项式插值法、3-5-3多项式插值法、4-3-4多项式插值法、5-3-5多项式插值法、3-4-5多项式插值法进行仿真。对比仿真结果,5-3-5多项式插值法在参数曲线光滑连续方面优于其他几种方法。以时间最短为优化目标,用遗传算法对5-3-5多项式插值方法进行优化。结果表明,该方法可以在时间最优的同时,各关节角度、角速度和角加速度曲线光滑连续,机器人可以平稳运行,顺利避开障碍物,满足设计要求。 相似文献
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采用气相色谱法对7-氯-2-氧代庚酸乙酯产品进行纯度测定,同时分离并分析了其中主要的微量杂质,该杂质为7-氯-2-氧代庚酸乙酯生产过程中产生的副产物。采用气相色谱-质谱联用法对7-氯-2-氧代庚酸乙酯产品进行了分析,通过解析7-氯-2-氧代庚酸乙酯及其主要杂质的质谱数据推断出该杂质为6-氯己醛。 相似文献
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对6个蛹虫草菌株进行菌丝生长速率和子实体栽培试验研究。培养20d后的结果表明,YJ11-1,YJ11-2,YJ11-4均有原基形成;YJ11-3的菌丝基部有黄色素产生,但没有形成原基;蛹-1、蛹-2菌丝呈白色,气生菌丝多,无黄色素形成。将筛选出的3个菌株YJ11-1,YJ11-2,YJ11-4作为栽培试验的供试菌株。 相似文献
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目的研究赶黄草(Penthorumchinese Pursh.)挥发油的化学成分.方法用赶黄草全草经水蒸气蒸馏所得的挥发性成分,用气相色谱-质谱进行分离鉴定,结合计算机检索技术,对分离的化合物进行分析和结构鉴定,应用色谱峰面积归一法测定各组分的相对百分含量.结果水蒸气蒸馏的得油率为0.30%;共分离出38个组分,鉴定了其中的26个组分,占挥发油总量的95%.结论首次报道了赶黄草挥发油的化学成分主要为酮和酯类化合物,含量较多的是棕榈酸乙酯(18.64%),反式-6,10-二甲基-5,9-十一烷双烯-2-酮(14.95%),(反,反)-6,10,14-三甲基-5,9,13-十五烷三烯-2-酮(10.42%),棕榈酸(9.60%),(顺,顺,顺)-9,12,15-十八烷三烯-1-醇(7.40%)等. 相似文献
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《机电工程技术》2009,38(7):179-184
09-07-13 Research Progress of Polishing Hard Brittle Material by Laser
GUO Xiao-yan, LIU Xiao-fei（Zhongshan Torch Polytechnic, Zhongshan528436, China）
Abstract： The research background of polishing hard brittle material by laser and basic theoretical model are introduced in this paper. Then its mechanism is discussed and the influence factors on the polishing effect are summed up. Finally some predictions of its future development are presented. 相似文献
GUO Xiao-yan, LIU Xiao-fei（Zhongshan Torch Polytechnic, Zhongshan528436, China）
Abstract： The research background of polishing hard brittle material by laser and basic theoretical model are introduced in this paper. Then its mechanism is discussed and the influence factors on the polishing effect are summed up. Finally some predictions of its future development are presented. 相似文献
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《机电工程技术》2009,38(6):161-166
09-06-13 Requirements Analysis of CNC Machine Tool IETM System Based on UML JIANG Wei-wei, MA Shao-li, XU Ding-hai, GUO Hong- fen（1.Navy Academe of Armament, Beijing 100161, China; 2. Technical Support Engineering Department of Armored Force Engineering Academy, Beijing 100072, China） 相似文献
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《机电工程技术》2009,38(8):207-212
09-08-13 Design of Injection Mould for DVD Door Panel Based on CAE Technology HUANG Gui-jian~, HONG Jian-ming, LIANG Xiong, WU Xiao-yu, LI Ji-bin （1. College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China; 2. School of Mechanical and Electrical Engineering, Shenzhen Polytechnic, Shenzhen518055, China; 3. Shenzhen Key Laboratory of Advanced Mould Manutacturing Technology, Shenzhen University, Shenzhen 5 t 8060, China）
Abstract： The structural feature and forming technology of the DVD door panel were analyzed. By using Moldflow/MPI software, the feed system of the mould was ascertained. The angle pin core-pulling mechanism was adopted and the mechanism set inside the core-pulling slide preventing the plastic parts from adhering to the side core of the mould was designed, so the smooth demoulding of the plastic parts was realized. The structure of the injection mould and working process were discussed. The mould was already in mass production and the plastic parts could meet the customers＇ technical requirements.
Key words： CAE; injection mould; feed system; core-pulling; slide; demoulding 相似文献
Abstract： The structural feature and forming technology of the DVD door panel were analyzed. By using Moldflow/MPI software, the feed system of the mould was ascertained. The angle pin core-pulling mechanism was adopted and the mechanism set inside the core-pulling slide preventing the plastic parts from adhering to the side core of the mould was designed, so the smooth demoulding of the plastic parts was realized. The structure of the injection mould and working process were discussed. The mould was already in mass production and the plastic parts could meet the customers＇ technical requirements.
Key words： CAE; injection mould; feed system; core-pulling; slide; demoulding 相似文献
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《机电工程技术》2009,38(5):123-126
09-05-13 Design of Injection Mould for Computer Button
XU Yong-jun, JIAN Jian-xiong（Dett.of Mechanical Engineering, Guangdong Vocational College of Industry and Commerce, Guangzhou510510, China）
Abstract： The technological characteristic of computer button, the design and condition of injection forming were analyzed. The key points in design and working process were stated in detail for realizing lateral core-pulling and assuring presentation quality.
Key words： computer button; injection mould; mould design 相似文献
XU Yong-jun, JIAN Jian-xiong（Dett.of Mechanical Engineering, Guangdong Vocational College of Industry and Commerce, Guangzhou510510, China）
Abstract： The technological characteristic of computer button, the design and condition of injection forming were analyzed. The key points in design and working process were stated in detail for realizing lateral core-pulling and assuring presentation quality.
Key words： computer button; injection mould; mould design 相似文献
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《机电工程技术》2009,38(9):159-164
A Survey on Job Shop Dynamic Scheduling;General Introduction of Penning Ion Source;Development of Communication Technology of Digital Substation; Research and Development on Nesting System of Metal Components Based on the Remaining Material; The Key Technologies Research on High- Speed Fan Impeller Mold of Remote Network-Based Distributed Collaborative Design＇ 相似文献