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3953篇 您的检索式:作者名="Evan G"
    题名 作者 年代 出处 被引量
1有机阴离子柱撑水滑石的插层组装及超分子结构显示文摘以水滑石Mg4Al2(OH)12CO3.4H2O为前体,采用离子交换法进行插层组装制备了丁二酸、己二酸、十二烷基磺酸、对羟基苯甲酸、苯甲酸和对苯二甲酸柱撑水滑石,并用XRD, FTIR和DTA测试技术对样品进行了表征. 结果表明,通过控制离子交换条件,6种有机酸根离子可以插入水滑石的层间完全取代CO32离子,并形成具有超分子结构的稳定有机阴离子柱撑水滑石.李殿卿 冯桃 Evans D G 段雪 2002过程工程学报2002,2,4:35
2微波技术在制备水滑石和柱撑水滑石中的应用显示文摘在制备水滑石的过程中使用了微波技术进行晶化,并与常规晶化方法进行了对比.XRD结果表明微波晶化法可以在约8分钟内达到常规热晶化法24小时一样的效果.在制备1,5萘二磺酸柱撑水滑石的过程中,使用了微波技术进行离子交换插入.XRD结果表明,微波作用10分钟与常规热交换法72小时具有一样甚至更好的离子交换效果.用微波插入法制备了磷钨酸柱撑水滑石。杜以波 何静 李峰 D G Evans 段雪 王作新 1998应用科学学报1998,16,3:21
3Total knee arthroplasty and fractures of the tibial plateau显示文摘Tibial plateau fractures are common injuries that occur in a bimodal age distribution. While there are various treatment options for displaced tibial plateau fractures, the standard of care is open reduction and internal fixation(ORIF). In physiologically young patients with higher demand and better bone quality, ORIF is the preferred method of treating these fractures. However, future total knee arthroplasty(TKA) is a consideration in these patients as post-traumatic osteoarthritis is a common long-term complication of tibial plateau fractures. In older, lower demand patients, ORIF is potentially less favorable for a variety of reasons, namely fixation failure and the need for delayed weight bearing. In some of these patients, TKA can be considered as primary mode of treatment. This paper will review the literature surrounding TKA as both primary treatment and as a salvage measure in patients with fractures of the tibial plateau. The outcomes, complications, techniques and surgical challenges are also discussed.Kenneth A Softness Ryan S Murray Brian G Evans 2017World Journal of Orthopedics2017,8,2:15
4γ-Al_2O_3载体孔内原位合成水滑石显示文摘以尿素为沉淀剂,利用γ Al2O3的内孔表面铝源原位合成水滑石.考察了晶化时间、晶化温度、初始溶液浓度、原料配比对原位合成水滑石的影响.实验中发现晶化6h,MgAlCO3 LDH的晶体结构已趋于完整,晶化时间大于6h时会有NH4Al(OH)2CO3·H2O杂相生成.在实验条件范围内,生成的一次粒子大小随着晶化时间的延长逐渐增大,随着晶化温度的升高、初始溶液浓度的增大而减小.张蕊 李殿卿 张法智 Evans D G 段雪 2003复旦学报(自然科学版)2003,42,3:11
5Zn-Al-CO_3水滑石晶粒尺寸控制与光屏蔽作用研究显示文摘在旋转液膜反应器中制备成核浆液 ,通过控制晶化温度制备了不同粒径且晶体结构完整的Zn Al CO3水滑石 (LDHs)。将不同粒径的Zn Al CO3LDHs配成质量分数为 0 0 2 %的水分散液 ,测定在紫外 -可见光范围的透过率 ,结果发现 ,随晶化温度的升高 ,LDHs粒径增大 ,样品对紫外及可见光的阻隔作用增强 ;Zn Al CO3LDHs在不同波长下的吸光度与晶体粒子在a轴和c轴方向的尺寸呈线性关系。由外推法求得了Zn Al CO3LDHs对各波长紫外 -可见光产生屏蔽作用的晶粒尺寸阈值。对波长分别为 2 90、3 2 0、40 0、60 0和 80 0nm光波能够产生屏蔽作用的Zn Al CO3LDHs ,其粒子尺寸在a轴方向需分别大于 3 2 92、3 3 77、3 4 77、3 5 5 6、3 5 79nm ;在c轴方向需分别大于 9 73、12 79、16 47、19 3 5、2 0 2 2nm。邢颖 李殿卿 郭灿雄 D G Evans 段雪 2003精细化工2003,20,1:9
6Colonic ulcerations may predict steroid-refractory course in patients with ipilimumab-mediated enterocolitis显示文摘AIM To investigate management of patients who develop ipilimumab-mediated enterocolitis, including association of endoscopic findings with steroid-refractory symptoms and utility of infliximab as second-line therapy.METHODS We retrospectively reviewed all patients at our centerwith metastatic melanoma who were treated with ipilimumab between March 2011 and May 2014. All patients received a standard regimen of intravenous ipilimumab 3 mg/kg every 3 wk for four doses or until therapy was stopped due to toxicity or disease progression. Basic demographic and clinical data were collected on all patients. For patients who developed grade 2 or worse diarrhea(increase of 4 bowel movements per day), additional data were collected regarding details of gastrointestinal symptoms, endoscopic findings and treatment course. Descriptive statistics were used.RESULTS A total of 114 patients were treated with ipilimumab during the study period and all were included. Sixteen patients(14%) developed ≥ grade 2 diarrhea. All patients were treated with high-dose corticosteroids(1-2 mg/kg prednisone daily or equivalent). Nine of 16 patients(56%) had ongoing diarrhea despite highdose steroids. Steroid-refractory patients received one dose of intravenous infliximab at 5 mg/kg, and all but one had brisk resolution of diarrhea. Fourteen of the patients underwent either colonoscopy or sigmoidoscopy with variable endoscopic findings, ranging from mild erythema to colonic ulcers. Among 8 patients with ulcers demonstrated by sigmoidoscopy or colonoscopy, 7 patients(88%) developed steroidrefractory symptoms requiring infliximab. With a median follow-up of 264 d, no major adverse events associated with prednisone or infliximab were reported.CONCLUSION In patients with ipilimumab-mediated enterocolitis, the presence of colonic ulcers on endoscopy was associated with a steroid-refractory course.Animesh Jain Evan J Lipson William H Sharfman Steven R Brant Mark G Lazarev 2017World Journal of Gastroenterology2017,23,11:8
7Ti-MCM-41催化剂的表面性质及介质极性对苯羟化反应化学选择性的影响显示文摘用不同的铝源改性Ti MCM 41催化剂 ,得到了具有长程有序结构、n(Si) /n(Ti) =2 5的不同Si/Al比的改性Ti MCM 41.通过研究芳烃羟化反应随催化剂表面性质的变化规律发现 ,调变催化剂的表面性质 ,可控制反应物苯及目的产物苯酚与Al Ti MCM 41催化活性中心接近的程度 ,从而可实现对芳烃羟化反应化学选择性的控制 .介质极性对芳烃的化学亲和选择性也有影响 。马辉 何静 David G Evans 段雪 2001催化学报2001,22,5:8
8Layered intercalated functional materials based on efficient utilization of magnesium resources in China显示文摘Mg-based layered intercalated functional materials of the layered double hydroxide type are a significant class of magnesium compounds.Based on long-term studies of these materials in the State Key Laboratory of Chemical Resource Engineering in Beijing University of Chemical Technology,two principles of 'using the intended application of a material as a guide to its structure design and synthesis process' and 'the design of controlled intercalation processes in the light of future production processing requirements' have been developed.To achieve these objectives,the composition of the host layers and guest interlayer anions was tailored at the microlevel,while the mesostructure and macrostructure were controlled to fabricate different kinds of Mg-based layered intercalated functional materials.These materials have diverse applications in key areas such as catalysis,the environment,and construction,and as polymer additives.Therefore,China's magnesium resources may be utilized more efficiently for the benefit of society.David G EVANS 2010Science China Chemistry2010,53,7:7
9偶氮苯磺酸衍生物的光致顺反异构化机理显示文摘基于密度泛函理论(DFT)中的B3LYP方法,在6-311++G(d,p)水平上全优化得到了3,3′-偶氮苯磺酸(3,3′-AbS)在S0和T1态顺反异构化机理.在S0态存在两种异构化途径:绕角NNC反转和绕NC键旋转相结合的形式和单纯的绕CNNC二面角旋转形式,两种异构化途径的能垒分别为94.2和124.3kJ·mol-1.有必要指出的是,在反转与旋转结合的途径上存在二次过渡态.在T1态上仅存在旋转途径且其能垒为21.1kJ·mol-1.采用含时密度泛函理论(TD-DFT),在B3LYP/6-311++G(d,p)水平上,沿着基态的两种异构化途径计算得到了T1,S1,T2和S2态的垂直激发的势能剖面,分析了可能的光致异构化途径.当激发光波长为330nm时,反应物分子被激发到S2态,然后弛豫到较低的能态S1发生异构化反应,旋转途径存在两条活化途径:(1)沿着S1/S0的圆锥交叉点衰变到产物;(2)由S1态弛豫到T1态后,在S0-T1-S0的区域发生异构化,再转化到产物.计算结果表明,3,3′-AbS通过反转和旋转的结合形式实现在S0态的异构化,而被激发后倾向于沿着旋转坐标作为其主要的异构化途径.朱玥 蒲敏 何静 EVANS David G 2009物理化学学报2009,25,11:7
10Pancreatitis: Preventing catastrophic haemorrhage显示文摘Pancreatitis represents nearly 3% of acute admissions to general surgery in United Kingdom hospitals and has a mortality of around 1%-7% which increases to around 10%-18% in patients with severe pancreatitis. Patients at greatest risk were those identified to have infected pancreatic necrosis and/or organ failure. This review seeks to highlight the potential vascular complications associated with pancreatitis that despite being relatively uncommon are associated with mortality in the region of 34%-52%. We examine the current evidence base to determine the most appropriate method by which to image and treat pseudo-aneurysms that arise as the result of acute and chronic inflammation of pancreas. We identify how early recognition of the presence of a pseudo-aneurysm can facilitate expedited care in an expert centre of a complex pathology that may require angiographic, percutaneous, endoscopic or surgical intervention to prevent catastrophic haemorrhage.Richard PT Evans Moustafa Mabrouk Mourad Gunraj Pall Simon G Fisher Simon R Bramhall 2017World Journal of Gastroenterology2017,23,30:6
11TPPTS柱撑水滑石的制备及表征显示文摘制备了水溶性好的烯烃氢甲酰化反应催化剂的配体—间三苯基膦三磺酸钠盐(P(m-C6H4SO3Na)3,TPPTS),采用31PNMR和IR对其进行了表征。以层柱化合物类水滑石为插层主体,TPPTS为插层客体,采用离子交换法和一步合成法制备了TPPTS柱撑水滑石,并采用IR和XRD对其进行了表征。IR谱图显示出TPPTS的特征吸收峰,XRD表征d001在1.59~1.64nm,可见两种方法均可制备TPPTS柱撑水滑石。卫敏 何静 李峰 D G Evans 段雪 1999石油学报(石油加工)1999,15,1:6
12Pioneering function of Isl1 in the epigenetic control of cardiomyocyte cell fate显示文摘Generation of widely differing and specialized cell types from a single totipotent zygote involves large-scale transcriptional changes and chromatin reorganization. Pioneer transcription factors play key roles in programming the epigenome and facilitating recruitment of additional regulatory factors during successive cell lineage specification and differentiation steps. Here we show that Isl1 acts as a pioneer factor driving cardiomyocyte lineage commitment by shaping the chromatin landscape of cardiac progenitor cells. Using an Isl1 hypomorphic mouse line which shows congenital heart defects, genome-wide profiling of Isl1 binding together with RNA- and ATAC-sequencing of cardiac progenitor cells and their derivatives, we uncover a regulatory network downstream of Isl1 that orchestrates cardiogenesis. Mechanistically, we show that Isl1 binds to compacted chromatin and works in concert with the Brg1-Baf60c-based SWI/SNF complex to promote permissive cardiac lineage-specific alterations in the chromatin landscape not only of genes with critical functions in cardiac progenitor cells, but also of cardiomyocyte structural genes that are highly expressed when Isl1 itself is no longer present. Thus, the Isl1/Brg1-Baf60c complex plays a crucial role in orchestrating proper cardiogenesis and in establishing epigenetic memory of cardiomyocyte fate commitment.Rui Gao Xingqun Liang Sirisha Cheedipudi Julio Cordero Xue Jiang Qingquan Zhang Luca Caputo Stefan Günther Carsten Kuenne Yonggang Ren Shoumo Bhattacharya Xuejun Yuan Guillermo Barreto Yihan Chen Thomas Braun Sylvia M. Evans Yunfu Sun Gergana Dobreva 2019Cell Research2019,29,6:5
13Guidelines and Good Clinical Practice Recommendations for Contrast Enhanced Ultrasound (CEUS) - Update 2008显示文摘M Claudon D Cosgrove T Albrecht L Bolondi M Bosio F Calliada J.-M Correas K Darge C Dietrich M D’Onofrio D Evans C Filice L Greiner K J?ger N Jong E Leen R Lencioni D Lindsell A Martegani S Meairs C Nols?e F Piscaglia P Ricci G Seidel B Skjoldbye L Solbia 2008Ultraschall in Med2008,,01:4
14Guidelines and Good Clinical Practice Recommendations for Contrast Enhanced Ultrasound (CEUS) - Update 2008显示文摘M Claudon D Cosgrove T Albrecht L Bolondi M Bosio F Calliada J.-M Correas K Darge C Dietrich M D'Onofrio D Evans C Filice L Greiner K J?ger N Jong E Leen R Lencioni D Lindsell A Martegani S Meairs C Nols?e F Piscaglia P Ricci G Seidel B Skjoldbye L Solbia 2008Ultraschall in Med2008,,01:3
15Long-term effect of aspirin on cancer risk in carriers of hereditary colorectal cancer: an analysis from the CAPP2 randomised controlled trial显示文摘John Burn Anne-Marie Gerdes Finlay Macrae Jukka-Pekka Mecklin Gabriela Moeslein Sylviane Olschwang Diane Eccles D Gareth Evans Eamonn R Maher Lucio Bertario Marie-Luise Bisgaard Malcolm G Dunlop Judy WC Ho Shirley V Hodgson Annika Lindblom Jan Lubinski Pa 2011The Lancet2011,,9809:3
16On the mechanics of delamination and spalling in compressed films显示文摘Evans A G Hutchison J W 1993Int J Solids Structures1993,74,2:2
17On the mechanics of delamination and spalling in compressed films显示文摘Evans A G Hutchison J W 1993Int J Solids Structures1993,74,2:2
18Polycrystalline silicon strain sensors 显示文摘French P J Evans A G R 1985Sensors and Actuators A1985,7,:2
19Apoptosis of human vascular smooth muscle cells derived from normal vessels couonary atheresclerotic plaques 显示文摘Bennet M Evan G Schwartz S 1995Clin invest1995,95,5:1
20Glacier depth sounding from the air显示文摘Evans S Robin G Q 1966Nature1966,210,:1
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