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1088篇 您的检索式:作者名="Plank"
    题名 作者 年代 出处 被引量
1水化水泥颗粒表面超塑化剂吸附层分布模型(英文)显示文摘制备了钙矾石(AFt)、单硫型硫铝酸钙(AFm)和钾长石类单矿物,并研究了三聚氰胺磺酸盐甲醛缩聚物(PMS)、β-萘磺酸盐甲醛缩合物(BNS)及聚羧酸盐(PC)等几种化学成分不同的超塑化剂在其早期水化颗粒表面上的吸附行为.研究发现,zeta电位是决定水泥颗粒表面对超塑化剂吸附量的关键因素.以溶液沉淀析出法人工合成的AFt具有较高的正zeta电位,能吸附大量带负电荷的超塑化剂,AFm仅带少量正电荷,其吸附超塑化剂相对较少,钾长石、氢氧钙石和石膏的zeta电位几乎为零或负值,因而基本不吸附超塑化剂.根据实验结果,笔者认为水化水泥颗粒用马赛克结构表示为最佳,而超塑化剂主要吸附在AF表面上.Johann Plank Panagiotis Chatziagorastou Christian Hirsch 2007建筑材料学报2007,10,1:15
2Impact of zeta potential of early cement hydration phases on superplasticizer adsorption显示文摘Johann Plank Christian Hirsch 2007Cement and Concrete Research2007,,4:3
3Preoperative immunonutrition in patients undergoing liver resection:A prospective randomized trial显示文摘BACKGROUND Preoperative supplementation with immunonutrients, including arginine and n-3 fatty acids, has been shown in a number of systematic reviews to reduce infectious complications in patients who have undergone gastrointestinal surgery. Limited information, however, is available on the benefits of nutritional supplementation enriched with arginine and n-3 fatty acids in patients undergoing liver resection.AIM To evaluate the effects of preoperative nutritional supplementation enriched with arginine and n-3 fatty acids on inflammatory and immunologic markers and clinical outcome in patients undergoing liver resection.METHODS Thirty-four patients undergoing liver resection were randomized to either five days of preoperative Impact? [1020 kcal/d, immunonutrition(IMN) group], or standard care [no supplementation, standard care(STD) group]. Nutritional status was measured at study entry by subjective global assessment(SGA).Functional assessments(grip strength, fatigue and performance status) were carried out at study entry, on the day prior to surgery, and on postoperative day(POD) 7 and 30. Inflammatory and immune markers were measured at study entry, on the day prior to surgery, and POD 1, 3, 5, 7, 10 and 30. Postoperative complications were recorded prospectively until POD30.RESULTS A total of 32 patients(17 IMN and 15 STD) were analysed. All except four patients were SGA class A. The plasma ratio of(eicosapentaenoic acid plus docosahexaenoic acid) to arachidonic acid was higher in IMN patients on the day prior to surgery and POD 1, 3, 5 and 7(P < 0.05). Plasma interleukin(IL)-6 concentrations were elevated in the IMN group(P = 0.017 for POD7). No treatment effect was detected for functional measures, immune response(white cell count and total lymphocytes) or markers of inflammation(C-reactive protein,tumour necrosis factor-α, IL-8, IL-10). There were 10 patients with infectious complications in the IMN group and 4 in the STD group(P = 0.087). Median hospital stay was 9(range 4–49) d in the IMN group and 8(3-34) d in the STD group(P = 0.476).CONCLUSION In well-nourished patients undergoing elective liver resection, this study failed to show any benefit of preoperative immunonutrition.Kylie Russell Han-Guang Zhang Lyn K GillANDers Adam SJR Bartlett Helena L Fisk Philip C Calder Peter J Swan Lindsay D Plank 2019World Journal of Hepatology2019,11,3:3
4Interaction mechanisms between Na montmorillonite clay and MPEG-based polycarboxylate superplasticizers显示文摘S. Ng J. Plank 2012Cement and Concrete Research2012,,6:3
5超高强混凝土中各组分与聚羧酸系超塑化剂之间的相互作用(英文)显示文摘超高强混凝土(ultra-high strength concrete,UHSC)的水灰比小于0.25,含有大量的硅灰等微细组分,这有利于颗粒的最优紧密堆积。硅灰的表面化学效应以及较大的表面积使其成为UHSC中最难被分散的组分。由甲基丙烯酸、甲基丙烯酸酯及甲代烯丙基磺酸合成的聚羧酸系超塑化剂能使水泥颗粒被有效润湿,然而烯丙醚-马来酸酐合成的聚羧酸系超塑化剂可以很好地分散硅灰。这2种不同的聚羧酸系超塑化剂的复合可以使其拥有不同的分子结构,从而赋予超高强混凝土很好的流动性。当只加入1种聚羧酸系超塑化剂时其掺量为1%(质量分数,下同),而当加入这种复合聚羧酸系超塑化剂时掺量为0.5%就足够了。这2种类型的聚羧酸系超塑化剂的协同效应是由于它们的选择性吸附:甲基丙烯酸盐基的聚羧酸系超塑化剂主要吸附在水泥颗粒表面,而烯丙醚基聚羧酸系超塑化剂主要吸附在硅灰颗粒表面。实验表明:小分子量的有机酸阴离子(如:柠檬酸盐、葡萄糖酸盐及酒石酸盐中的阴离子)与聚羧酸系超塑化剂之间具有潜在的协同作用。只需加入0.1%的这些阴离子即可显著提高烯丙醚基聚羧酸系超塑化剂的作用效果。这些阴离子可以起到一种辅助作用,它们同时吸附在水泥颗粒表面以及硅灰颗粒表面。水泥颗粒的表面首先由这些阴离子所占据,而硅灰颗粒表面吸附了烯丙醚基聚羧酸系超塑化剂和这些阴离子。这些阴离子起到了一种很强的静电分散效应,使烯丙醚基聚羧酸系超塑化剂的空间位阻效应得到加强。虽然聚羧酸系超塑化剂阴离子具有缓凝作用,但是使用这种复合聚羧酸系仍能制备出高早强混凝土。SCHROFL C GRUBER M PLANK J 2010硅酸盐学报2010,38,9:3
6Experimental determination of the effective anionic charge density of polycarboxylate superplasticizers in cement pore solution显示文摘J. Plank B. Sachsenhauser 2008Cement and Concrete Research2008,,1:2
7聚羧酸系减水剂作为助磨剂使用的构效关系研究显示文摘采用甲基烯丙基聚氧乙烯醚(HPEG)为大单体合成一系列具有不同酸醚比、侧链长度及相对分子质量的聚羧酸系减水剂(PCE)作为水泥助磨剂,研究了PCE分子结构对其助磨性能的影响.结果表明:PCE的助磨效果随着酸醚比的增大而增强,当酸醚比超过一定范围后,助磨效果有所减弱;具有短侧链及低相对分子质量的PCE具有更好的助磨效果;PCE磨制水泥的标准稠度用水量降低,16 h抗压强度降低,28 d抗压强度没有损失.杨海静 孙振平 PLANK Johann 水亮亮 董耀武 2022建筑材料学报2022,25,1:2
8A concept for a polycarboxylate superplasticizer possessing enhanced clay tolerance显示文摘L. Lei J. Plank 2012Cement and Concrete Research2012,,10:2
9水分和二氧化碳引起的水泥陈化对混凝土和砂浆中化学掺合料性能的影响(英文)显示文摘本工作旨在深入研究水泥的陈化对水泥与化学外加剂相互作用的影响。将Portland水泥分别暴露于35℃和相对湿度为90%的环境中1和3d。选取3种高效减水剂(萘系减水剂NSF、聚羧酸减水剂PCE和干酪素)、1种保水剂(MHEC,甲基纤维素)及两种促凝剂(甲酸钙和无定形氧化铝),研究了水泥与化学外加剂的相互作用。结果表明:水泥的陈化显著改变了新拌浆体的流动性、保水性与凝结行为。由于暴露过程中水泥表面部分水化,水泥的比表面积以及表面电荷均发生变化,进而影响了水泥与化学外加剂的相互作用。具体表现在以下3个方面:1)与新鲜水泥相比,减水剂在陈化水泥中的减水效果减弱,干酪素的分散能力略微降低,而PCE和PNS的分散能力均显著下降,尤其是PNS下降最大;2)陈化水泥呈现较好的保水能力和更高的需水量,因此,为了达到相同的保水效果,其所需的保水剂掺量较新鲜水泥低;3)在陈化水泥中,甲酸钙和无定形氧化铝的促凝效果显著下降,在水泥陈化3d后,这些促凝剂甚至可能延缓水泥水化。E DUBINA J PLANK 2014硅酸盐学报2014,42,2:2
10性能优越的混合金属氢氧化物-膨润土钻井液显示文摘钻井液对油气井钻探和隧道开凿的成功至关重要 ,用含有悬浮膨润土颗粒的混合金属氢氧化物 (MMH)配制的钻井液具有优越的剪切稀释流变特性 ,特别适用于油气田钻井和施工钻孔。本文从MMH的形成、化学结构、稠化效应及作用方式模型等多方面对其特性进行了解释 ,并举例说明其成功的应用。Johann Plank 高光军 2001国外油田工程2001,17,8:2
11Grain Scale Separation of Casein Proteins from Whole Casein on a Source 30Q Anion-exchange Resin Column Utilizing Fast Protein Liquid Chromatography (FPLC)显示文摘PLANK J ANDRES P R 2008Protein Expression and Purification2008,60,:1
12Mud and fluid migration in active mud volcanoes in Azerbaijan显示文摘Planke S Svensen H Horland M 2003Geo-Marine Letters2003,23,:1
13A tutorial on Reed-Solomon coding for fault-tolerance in RAID-like systems 显示文摘PLANK J S 1997Software Practice & Experience1997,27,9:1
14High-temperature-resisting and salt-resisting spacer fluid contains fluid loss additive, suspension stabilizer, fluidity regulator, barite powder or iron ore powder, and pure water显示文摘Dugonjic-Bilic F Plank J 2011Journal of Applied Polymer Science2011,121,3:1
15Plasma N-terminal pro-brain natri- uretic peptide in type 1 diabetic patients with and without diabetic ne- phropathy显示文摘Siebenhofer A Ng LL Plank J 2003Diabet Med2003,20,7:1
16Sequential metabolic changes following induction of systemic inflammatory response in patients with severe sepsis or major blunt trauma 显示文摘Plank LD Hill GL 2000World J Surg2000,24,6:1
17Cyclosporin A is superior to cyclophosphamide in children with steroid-resistant nephrotic syndrome-a randomized controlled multicentre trial by the Arbeitsgemeinschaft für P? diatrische Nephrologie显示文摘Plank C Kalb V Hinkes B 2008Pediatric Nephrology2008,23,9:1
18Study on the Interaction of Na-montmorillonite clay with polycarboxylates显示文摘NG S PLANK J 2012ACI Special Publication2012,,:1
19Bank Capital Regulation with Random Au- dits 显示文摘Sudipto Bhattacharya Manfred Plank Gunter Strobl Jo- sef Zechner 2002Journal of Economic Dynamics and Control2002,26,7:1
20Three-dimensional analysis of reinforced concrete beam-column structures in fire显示文摘Huang Z Burgess I W Plank R J 2009Journal of Structural Engineering ASCE2009,135,10:1
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