{"currentpage":1,"firstResult":0,"maxresult":10,"pagecode":5,"pageindex":{"endPagecode":5,"startPagecode":1},"records":[{"abstractinfo":"苯乙烯侧链C=C的选择性氧化一直是烯烃环氧化研究领域关注的热点之一.近几十年来,苯乙烯环氧化研究主要集中于多相过渡金属催化剂的开发与应用;以铜为主要活性物种的催化剂因具有较高的环氧苯乙烷选择性而备受瞩目.然而,采用pH调节法将铜离子引入三维六方介孔材料KIT-6阵列尚未见报道,尤其是pH值对合成材料的形貌、结构以及催化活性的影响尚未可知.基于此,本文采用pH调节法合成了铜嵌入KIT-6介孔材料Cu-KIT-6x(x代表初始溶胶的pH值,x=1.43,2.27,3.78,3.97,4.24,6.62),并将其应用于苯乙烯环氧化反应.采用X射线粉末衍射、氮气吸附脱附、透射电子显微镜以及X射线光电子能谱等手段对Cu-KIT-6x的表面结构及形貌进行了细致表征.结果表明,随着pH的变化,Cu-KIT-6x催化剂的物理特性、表面结构尤其是铜物种种类和含量均变化较大.较低的pH导致铜物种主要以Cu2+形式存在,难以引入到KIT-6骨架中,且不利于介孔材料的合成,最终导致产生无序介孔结构.当pH增大到3.78时,约有4.6 wt%的Cu(II)以?Cu?O?Si?形式成功引入KIT-6骨架中,获得了具有较高比表面积且有序的孔结构.此外,由于Cu2+的引入,骨架内部分Si4+被取代,促使Cu-KIT-63.78拥有可与载体KIT-6相媲美的大孔径.然而,当pH继续增大时,过量的Cu2+从KIT-6骨架中析出,以CuO形式存在于载体表面,从而导致Cu-KIT-6的孔径逐渐增大;同时NaOH对三维立方介孔结构的破坏,使得介孔结构坍塌及比表面积显著降低.以苯乙烯环氧化反应评价了Cu-KIT-6x系列催化剂的催化活性.当以叔丁基过氧化氢为氧化剂,乙腈为溶剂,在70 oC反应6 h后,Cu-KIT-63.78表现出最优的苯乙烯转化率(43.5%)及环氧苯乙烷选择性(86.6%).使用4次后,Cu-KIT-63.78展示了稳定的苯乙烯转化率、环氧苯乙烷选择性及有序的孔结构,充分表明其具有出色的稳定性.各表征结果揭示了在适宜pH下合成的Cu-KIT-63.78催化剂具有较高的铜含量、有序的立方Ia3d介孔结构及合适的结构参数,因而在苯乙烯环氧化反应中表现优异活性和良好稳定性.","authors":[{"authorName":"李白滔","id":"d1d2e07d-d8af-4d03-8533-8cab26df62ab","originalAuthorName":"李白滔"},{"authorName":"罗歆","id":"b8363466-51ee-421c-8828-e0426cafae98","originalAuthorName":"罗歆"},{"authorName":"黄静","id":"31fa06a3-a14a-4b47-8d84-fa46b1b52879","originalAuthorName":"黄静"},{"authorName":"王秀军","id":"6db59292-503a-483c-b2b3-c7b21a00d71f","originalAuthorName":"王秀军"},{"authorName":"梁振兴","id":"05aed053-6929-48a0-8cc4-67b23b8c5bfc","originalAuthorName":"梁振兴"}],"doi":"10.1016/S1872-2067(17)62767-0","fpage":"518","id":"0013831e-5395-449f-a3ff-e3d9501f21c9","issue":"3","journal":{"abbrevTitle":"CHXB","coverImgSrc":"journal/img/cover/CHXB.jpg","id":"18","issnPpub":"0253-9837","publisherId":"CHXB","title":"催化学报 "},"keywords":[{"id":"aab737ea-b67d-4e50-8673-66b3a1444984","keyword":"介孔材料","originalKeyword":"介孔材料"},{"id":"2b978a89-18ea-4888-aed5-6f83fb17683a","keyword":"KIT-6","originalKeyword":"KIT-6"},{"id":"9681f05e-38d6-41b6-8244-34f251ad0e8e","keyword":"苯乙烯环氧化","originalKeyword":"苯乙烯环氧化"},{"id":"6a314a2b-4661-48af-b878-991e0b47a411","keyword":"pH调节","originalKeyword":"pH调节"}],"language":"zh","publisherId":"cuihuaxb201703012","title":"含铜有序介孔Cu-KIT-6的合成及其苯乙烯环氧化催化性能:pH值的影响","volume":"38","year":"2017"},{"abstractinfo":"针对攀钢大方坯连铸机投产初期铸坯表面角部纵裂缺陷,建立了大方坯连铸结晶器内铜板与铸坯间的热力耦合模型,应用模型分析了大方坯连铸结晶器内的传热过程和坯壳的应力分布。在传热模型中,以稳态模型分析结晶器的传热过程,以瞬态模型分析铸坯的传热过程;在力学模型中,考虑铸坯和结晶器的接触边界以处理结晶器角部的气隙,以热弹塑性模型分析铸坯的变形和应力场。2种结构的连铸结晶器中大方坯温度场和应力场计算结果表明,结晶器倒角从25 mm×45°变为12 mm×45°时,可改善铸坯角部的传热条件,降低凝固坯壳角部温度,增加凝固坯壳厚度,有利于减轻和防止铸坯角部裂纹。","authors":[{"authorName":"陈永","id":"07d82b48-fb97-49ff-9f4d-6e94ae60eda4","originalAuthorName":"陈永"},{"authorName":"罗歆","id":"0edd5fe2-ce0a-43d9-b4ab-e2fe3bb33351","originalAuthorName":"罗歆"},{"authorName":"沈厚发","id":"34c7ccaa-f4dd-4774-ac96-9fffb8decfb6","originalAuthorName":"沈厚发"}],"categoryName":"|","doi":"","fpage":"33","id":"6565671d-623a-4f9d-bc54-365edee6dc23","issue":"3","journal":{"abbrevTitle":"GT","coverImgSrc":"journal/img/cover/GT.jpg","id":"27","issnPpub":"0449-749X","publisherId":"GT","title":"钢铁"},"keywords":[{"id":"d8442abd-7d74-42e0-8c0b-156facd93e7e","keyword":"大方坯连铸;结晶器;传热;热力耦合分析;有限元","originalKeyword":"大方坯连铸;结晶器;传热;热力耦合分析;有限元"}],"language":"zh","publisherId":"0449-749X_2008_3_13","title":"连铸结晶器内大方坯的热力耦合分析","volume":"43","year":"2008"},{"abstractinfo":"针对攀钢大方坯连铸机投产初期铸坯表面角部纵裂缺陷,建立了大方坯连铸结晶器内铜板与铸坯问的热力耦合模型,应用模型分析了大方坯连铸结晶器内的传热过程和坯壳的应力分布.在传热模型中,以稳态模型分析结晶器的传热过程,以瞬态模型分析铸坯的传热过程;在力学模型中,考虑铸坯和结晶器的接触边界以处理结晶器角部的气隙,以热弹塑性模型分析铸坯的变形和应力场.2种结构的连铸结晶器中大方坯温度场和应力场计算结果表明,结晶器倒角从25 mm×45°变为12 mm×45°时,可改善铸坯角部的传热条件,降低凝固坯壳角部温度,增加凝固坯壳厚度,有利于减轻和防止铸坯角部裂纹.","authors":[{"authorName":"陈永","id":"6f693b0b-4f94-444b-bbf3-3e0deeaa496e","originalAuthorName":"陈永"},{"authorName":"罗歆","id":"4874790c-633c-4cb1-896d-56ddcd275ee3","originalAuthorName":"罗歆"},{"authorName":"沈厚发","id":"f9521935-1e66-44bd-a48e-3ed9ac7af3ff","originalAuthorName":"沈厚发"}],"doi":"","fpage":"33","id":"9d937606-fb9e-4a2a-8437-b21f052fb72b","issue":"3","journal":{"abbrevTitle":"GT","coverImgSrc":"journal/img/cover/GT.jpg","id":"27","issnPpub":"0449-749X","publisherId":"GT","title":"钢铁"},"keywords":[{"id":"633d6d2b-874c-4328-8033-837c7a34f98b","keyword":"大方坯连铸","originalKeyword":"大方坯连铸"},{"id":"ec38af7d-3670-46bb-bb09-d340ebd5d811","keyword":"结晶器","originalKeyword":"结晶器"},{"id":"1d562ca1-668e-4efc-93f7-5a8a498ed401","keyword":"传热","originalKeyword":"传热"},{"id":"3c5dce0b-a361-4cb5-8bab-02158f01a50c","keyword":"热力耦合分析","originalKeyword":"热力耦合分析"},{"id":"29e746e1-40d1-4118-bcb8-58400dfcb092","keyword":"有限元","originalKeyword":"有限元"}],"language":"zh","publisherId":"gt200803007","title":"连铸结晶器内大方坯的热力耦合分析","volume":"43","year":"2008"},{"abstractinfo":"以铸坯和结晶器之间的间隙热阻为纽带,考虑保护渣凝固对接触热阻和渣膜热阻的影响,建立了连铸结晶器与铸坯热力耦合模型并编写了相应的有限元仿真程序.模型预测的坯壳厚度和实验结果吻合良好,两者差值≤2 mm.应用模型分析了大方坯连铸结晶器内的传热过程和坯壳的应力分布.结果表明,随着拉速提高,凝固坯壳厚度减薄,铸坯产生角部裂纹的趋势增加.","authors":[{"authorName":"陈永","id":"798873a4-3845-482f-97ba-9b26027666e6","originalAuthorName":"陈永"},{"authorName":"罗歆","id":"019ef1f2-c883-489c-a9eb-644a3c0e74b6","originalAuthorName":"罗歆"},{"authorName":"沈厚发","id":"32a8e743-a1db-4e2a-9e33-c7752b2be868","originalAuthorName":"沈厚发"}],"doi":"","fpage":"36","id":"b2039de6-6887-470d-b7de-386091cce34c","issue":"3","journal":{"abbrevTitle":"GT","coverImgSrc":"journal/img/cover/GT.jpg","id":"27","issnPpub":"0449-749X","publisherId":"GT","title":"钢铁"},"keywords":[{"id":"c5676394-ffab-4c65-949c-0b28d7421559","keyword":"大方坯连铸","originalKeyword":"大方坯连铸"},{"id":"a350a16f-adad-43d0-87d4-1731a7b2adc7","keyword":"结晶器","originalKeyword":"结晶器"},{"id":"48242429-2ec1-4844-bbb2-eea870721a18","keyword":"传热","originalKeyword":"传热"},{"id":"11da0ca9-4ec5-4f3f-8523-31ff2bc6e090","keyword":"热-力变形","originalKeyword":"热-力变形"},{"id":"7d6c75f7-9224-42e3-824d-924ffec69840","keyword":"有限元法","originalKeyword":"有限元法"}],"language":"zh","publisherId":"gt200903009","title":"连铸坯凝固过程热力耦合有限元模拟","volume":"44","year":"2009"},{"abstractinfo":"以铸坯和结晶器之间的间隙热阻为纽带,考虑保护渣凝固对接触热阻和渣膜热阻的影响,建立了连铸结晶器与铸坯热力耦合模型并编写了相应的有限元仿真程序。模型预测的坯壳厚度和实验结果吻合良好,两者差值≤2 mm。应用模型分析了大方坯连铸结晶器内的传热过程和坯壳的应力分布。结果表明,随着拉速提高,凝固坯壳厚度减薄,铸坯产生角部裂纹的趋势增加。","authors":[{"authorName":"陈永","id":"1be9a90e-0908-4680-ad57-5e54b1727a96","originalAuthorName":"陈永"},{"authorName":"罗歆","id":"bbc7aef9-b176-432d-95c3-6af25c051e4a","originalAuthorName":"罗歆"},{"authorName":"沈厚发","id":"8b0c8e95-c6c8-4363-9f50-bcc7439ca6db","originalAuthorName":"沈厚发"}],"categoryName":"|","doi":"","fpage":"36","id":"f97abf0f-dd5d-45b6-8b33-c58806a70b01","issue":"3","journal":{"abbrevTitle":"GT","coverImgSrc":"journal/img/cover/GT.jpg","id":"27","issnPpub":"0449-749X","publisherId":"GT","title":"钢铁"},"keywords":[{"id":"fae3bfc5-1c95-4b2c-91a9-cb1092cb7b03","keyword":"大方坯连铸;结晶器;传热;热力变形;有限元法","originalKeyword":"大方坯连铸;结晶器;传热;热力变形;有限元法"}],"language":"zh","publisherId":"0449-749X_2009_3_4","title":"连铸坯凝固过程热力耦合有限元模拟","volume":"44","year":"2009"},{"abstractinfo":"本文主要介绍了EAST实验中罗柯受电磁干扰的影响,由实验现象推测产生噪声的原因,通过大量的探索过程和模拟测试方法最终将这些干扰有效的抑制和去除,得到最佳解决方案.","authors":[{"authorName":"郑龙贵","id":"54ea57cc-bdd0-4b3e-9592-46209d61a32b","originalAuthorName":"郑龙贵"},{"authorName":"陆建华","id":"3911f055-295b-48a4-8674-4ceb711f996d","originalAuthorName":"陆建华"},{"authorName":"吕环宇","id":"5a58d35b-7ac4-4b76-b40f-8849d6283ed6","originalAuthorName":"吕环宇"},{"authorName":"潘超","id":"7acf4bb9-b8fc-47f4-849b-b57d971eab2b","originalAuthorName":"潘超"},{"authorName":"肖业政","id":"64f6f752-0570-4718-ac6a-29e6e81cd6e6","originalAuthorName":"肖业政"},{"authorName":"倪其才","id":"4c5b0e1f-fadf-4a2f-a749-342103503c10","originalAuthorName":"倪其才"},{"authorName":"朱崇铭","id":"a9ff8d6d-8562-47a3-88df-1158074c7f15","originalAuthorName":"朱崇铭"}],"doi":"","fpage":"238","id":"f677d040-1f37-49ba-8ff3-25fa084ad183","issue":"3","journal":{"abbrevTitle":"DWWLXB","coverImgSrc":"journal/img/cover/DWWLXB.jpg","id":"19","issnPpub":"1000-3258","publisherId":"DWWLXB","title":"低温物理学报 "},"keywords":[{"id":"842f0685-5a87-4a3b-9fda-b5b0f5fb2845","keyword":"罗柯","originalKeyword":"罗柯"},{"id":"2aad83ee-9e30-411c-b39f-c94dd6fc42a7","keyword":"电磁干扰","originalKeyword":"电磁干扰"},{"id":"38f8231b-7d3e-4d40-928e-6b118d2ff1d0","keyword":"测试方法","originalKeyword":"测试方法"},{"id":"362d3c08-98c3-4b94-93c5-5fd1351486d9","keyword":"干扰抑制","originalKeyword":"干扰抑制"}],"language":"zh","publisherId":"dwwlxb201403015","title":"EAST装置罗柯线圈测试与电磁干扰分析","volume":"36","year":"2014"},{"abstractinfo":"建立了同时测定饲料中西马特罗、盐酸克伦特罗与沙丁胺醇的毛细管区带电泳-紫外检测方法.考察了实验参数对分离和检测结果的影响.在最佳实验条件下,在60 mmol/L的柠檬酸-柠檬酸钠运行缓冲液(pH 6.29)中,上述3种物质在8 min内完全分离.西马特罗、盐酸克伦特罗和沙丁胺醇的线性响应范围为0.1~1.0 mg/L,最低检测限(以信噪比为3计)分别为0.02,0.03和0.02 mg/L.所建立的方法直接用于饲料中西马特罗、盐酸克伦特罗和沙丁胺醇的测定,结果令人满意.","authors":[{"authorName":"段建平","id":"bc602b01-9097-4d70-8d62-ab456734a245","originalAuthorName":"段建平"},{"authorName":"陈红青","id":"9f98f6df-f5a2-4f2e-a582-ce352d38d2c8","originalAuthorName":"陈红青"},{"authorName":"陈颖","id":"cd7c7b6a-c92e-4b82-9e33-4770c3b52223","originalAuthorName":"陈颖"},{"authorName":"黄颖","id":"7b447bfa-a7ed-445f-b134-46946dfafc48","originalAuthorName":"黄颖"},{"authorName":"陈国南","id":"8e366ae9-460a-4eb9-89d6-97e8950c2fc0","originalAuthorName":"陈国南"}],"doi":"10.3321/j.issn:1000-8713.2005.03.011","fpage":"261","id":"e656dd03-f676-492e-929d-447131a8e206","issue":"3","journal":{"abbrevTitle":"SP","coverImgSrc":"journal/img/cover/SP.jpg","id":"58","issnPpub":"1000-8713","publisherId":"SP","title":"色谱 "},"keywords":[{"id":"b7dd06c8-5fce-44ee-9214-baf4f94b67a4","keyword":"毛细管区带电泳","originalKeyword":"毛细管区带电泳"},{"id":"71418ae4-2594-4a27-8819-02f774730b67","keyword":"西马特罗","originalKeyword":"西马特罗"},{"id":"24e47096-b0d0-411c-825b-da2c40b2c53e","keyword":"盐酸克伦特罗","originalKeyword":"盐酸克伦特罗"},{"id":"43285093-7519-449e-bfd0-9210e3962886","keyword":"沙丁胺醇","originalKeyword":"沙丁胺醇"},{"id":"3b024208-7eb3-41a5-835a-e95c25d0bb38","keyword":"饲料","originalKeyword":"饲料"}],"language":"zh","publisherId":"sp200503011","title":"毛细管区带电泳法同时测定饲料中西马特罗、盐酸克伦特罗和沙丁胺醇","volume":"23","year":"2005"},{"abstractinfo":"利用化学分析、X射线粉晶衍射、差热及热重分析、红外光谱、扫描电镜及可见光吸收光谱等现代测试方法对俄罗斯穆伦地区查罗石玉进行了系统的矿物学特征的研究,测得查罗石玉的主要矿物查罗石(紫硅碱钙石)是一种富钙、钾、钠的硅酸盐矿物;含有一定的结晶水和结构水.主要矿物查罗石(紫硅碱钙石)属单斜晶系,晶胞参数为:a0=1.9626nm,b0=3.2110nm,c0=0.7198nm,β=93.76°.扫描电子显微镜下观察,查罗石主要由细长矩形的片状查罗石组成,查罗石晶体呈定向排列,晶体大小平均长约150~200μm,宽约10~20μm左右,发育良好的多组波状弯曲的片状查罗石晶体及其纤维变晶结构是查罗石玉具有丝绢光泽的原因.建立了查罗石矿物的标准红外吸收光谱图.最后初步探讨了查罗石的致色机理:Mn3+是产生查罗石紫色的主要原因.","authors":[{"authorName":"李雯雯","id":"386e9067-1d2d-4203-b027-1854977ed0b6","originalAuthorName":"李雯雯"},{"authorName":"吴瑞华","id":"6efb3c65-1577-4f28-88d5-34ac0c957347","originalAuthorName":"吴瑞华"},{"authorName":"陈鸣鹤","id":"d0f3b032-ef23-436e-a41c-acb9f5377c3f","originalAuthorName":"陈鸣鹤"}],"doi":"","fpage":"71","id":"76948c78-a7d6-40c9-b1d1-0839acbb3911","issue":"1","journal":{"abbrevTitle":"GSYTB","coverImgSrc":"journal/img/cover/GSYTB.jpg","id":"36","issnPpub":"1001-1625","publisherId":"GSYTB","title":"硅酸盐通报 "},"keywords":[{"id":"dd325c0e-e37c-4d1d-b131-8b1d44de0c3e","keyword":"查罗石玉","originalKeyword":"查罗石玉"},{"id":"64ea13bd-5a8a-49bf-b3b7-1ebdefd4f8e6","keyword":"紫硅碱钙石","originalKeyword":"紫硅碱钙石"},{"id":"f602b988-f6a5-4f24-96a4-80159a697257","keyword":"矿物学","originalKeyword":"矿物学"},{"id":"2fad16cf-d7db-4ebf-a82a-db033a41c530","keyword":"俄罗斯","originalKeyword":"俄罗斯"}],"language":"zh","publisherId":"gsytb200801017","title":"俄罗斯穆伦地区查罗石玉矿物学特征的研究","volume":"27","year":"2008"},{"abstractinfo":"本文介绍罗克普方坯连铸机提高拉速后产生脱方的原因和控制方法.","authors":[{"authorName":"杨大海","id":"33245da6-c0b5-4362-bc05-c0154436bd00","originalAuthorName":"杨大海"}],"doi":"10.3969/j.issn.1005-4006.2001.02.012","fpage":"32","id":"1f630b9c-8903-4548-b753-0432c0a52c5f","issue":"2","journal":{"abbrevTitle":"LZ","coverImgSrc":"journal/img/cover/LZ.jpg","id":"52","issnPpub":"1005-4006","publisherId":"LZ","title":"连铸"},"keywords":[{"id":"31794029-5688-4642-bce0-1609968e9ec7","keyword":"","originalKeyword":""}],"language":"zh","publisherId":"lz200102012","title":"罗克普方坯连铸机拉速提高后的脱方控制","volume":"","year":"2001"},{"abstractinfo":"建立了一种简单、快速测定罗哌卡因血药浓度的反相高效液相色谱法。在血清样品中加入布比卡因作内标,用二氯甲烷提取,氮气吹干,残渣用流动相溶解进样。色谱条件:分析柱为C18反相柱,流动相为0.01 mol*L-1磷酸二氢钾(pH 3.0)-乙腈(体积比为84∶16)溶液,流速为1.2 mL*min-1, 在紫外检测波长210 nm处进行检测。罗哌卡因及内标在11 min内完全分离,最低检测质量浓度为0.025 mg*L-1,在0.05 mg*L-1~ 2.50 mg*L-1时线性关系良好,r=0.9997,低、中、高浓度下的回收率、日间及日内精密度均符合方法学要求。方法简便、快速、稳定、重现性好,可以用于罗哌卡因血药浓度的临床监护及药代动力学的研究。","authors":[{"authorName":"张春燕","id":"b89bcfc3-6f70-4ec3-a864-555cf7ba130b","originalAuthorName":"张春燕"},{"authorName":"顾健","id":"748d791b-5f28-488e-a4fa-86fd9c5d9e42","originalAuthorName":"顾健"},{"authorName":"段金菊","id":"8904f19b-46fa-4841-bebe-b995d5e8d493","originalAuthorName":"段金菊"},{"authorName":"钟蕾","id":"f019fb9a-d963-44ec-9c3f-324515e57ead","originalAuthorName":"钟蕾"},{"authorName":"李玉珍","id":"d84b2cd1-832c-43a8-96c1-31bead020064","originalAuthorName":"李玉珍"}],"doi":"10.3321/j.issn:1000-8713.2002.01.014","fpage":"56","id":"5c6d5c4b-38b8-46ca-bb74-7548856efac0","issue":"1","journal":{"abbrevTitle":"SP","coverImgSrc":"journal/img/cover/SP.jpg","id":"58","issnPpub":"1000-8713","publisherId":"SP","title":"色谱 "},"keywords":[{"id":"ce0e2497-4621-4b59-870a-57424b569797","keyword":"反相高效液相色谱法","originalKeyword":"反相高效液相色谱法"},{"id":"bf67aa03-336c-42ae-a6fe-36d482375d79","keyword":"罗哌卡因","originalKeyword":"罗哌卡因"},{"id":"1c6d9e4b-b90b-4ef7-9abc-affc35bba231","keyword":"血清","originalKeyword":"血清"}],"language":"zh","publisherId":"sp200201014","title":"反相高效液相色谱法测定人血清中的罗哌卡因","volume":"20","year":"2002"}],"totalpage":27,"totalrecord":270}