检索结果-南通市图书馆

不同硅烷偶联剂对白炭黑填充天然橡胶基轮胎胶的补强效果(二)

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

现代橡胶技术 2017年第4期43卷 19-25页

作者：朱永康 karnda Sengloyluan wilma k.dierkes Jaeques W.M.Noodermeer

（接上期）在所研究的硅烷中，配合TESPT的白炭黑填充NR胶料具有最高的化学结合胶含量，而配合NXT和VPSi-363的胶料则具有相似化学结合胶含量，其化学结合胶含量低于配合TESPT的胶料但高于配合VTES和不配合硅烷的混炼胶。添加含硫硅烷（... 详细信息

（接上期）在所研究的硅烷中，配合TESPT的白炭黑填充NR胶料具有最高的化学结合胶含量，而配合NXT和VPSi-363的胶料则具有相似化学结合胶含量，其化学结合胶含量低于配合TESPT的胶料但高于配合VTES和不配合硅烷的混炼胶。添加含硫硅烷（如TESPT、NXT和VPSi-363）的胶料其良好的填料．橡胶相互作用，不仅能产生高效的硅烷化反应，而且也因为硫醇而提高了在白炭黑表面的吸附性。

关键词：硅烷偶联剂炭黑填充橡胶基补强效果轮胎胶 TESPT NR胶料天然

A High-Order Discontinuous Galerkin Solver for Helically Symmetric Flows

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2021年第6期30卷 288-320页

作者： Dominik.dierkes Florian kummer Dominik Plumacher Department of Mechanical Engineering Technische Universitat DarmstadtOtto-Berndt-Straße 264287 DarmstadtGermany

We present a high-order discontinuous Galerkin(DG)scheme to solve the system of helically symmetric Navier-Stokes equations which are discussed in[28].In particular,we discretize the helically reduced Navier-Stokes equations emerging from a reduction of the independent variables such that the remaining variables are:t,r,ξwithξ=az+bϕ,where r,ϕ,z are common cylindrical coordinates and t the *** this,all three velocity components are kept non-zero.A new non-singular coordinateηis introduced which ensures that a mapping of helical solutions into the three-dimensional space is well *** that,periodicity conditions for the helical frame aswell as uniqueness conditions at the centerline axis r=0 are *** the sector near the axis of the computational domain a change of the polynomial basis is implemented such that all physical quantities are uniquely defined at the *** the temporal integration,we present a semi-explicit scheme of third order where the full spatial operator is splitted into a Stokes operator which is discretized implicitly and an operator for the nonlinear terms which is treated *** are conducted for a cylindrical shell,excluding the centerline axis,and for the full cylindrical domain,where the centerline is *** all cases we obtain the convergence rates of order O(hk+1)that are expected from DG *** addition to the first DG discretization of the system of helically invariant Navier-Stokes equations,the treatment of the central axis,the resulting reduction of the DG space,and the simultaneous use of a semi-explicit time stepper are of particular novelty.

关键词： Discontinuous Galerkin(DG) helical flows

Validity of Amontons's law for run-in short-cut aramid fiber reinforced elastomers:The effect of epoxy coated fibers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Friction 2020年第3期8卷 613-625页

作者： M.kHAFIDH D.J.SCHIPPER M.A.MASEN N.VLEUGELS W.k.dierkes J.W.M.NOORDERMEER Faculty of Engineering Technology University of TwenteEnschede 7500AEThe Netherlands Dutch Polymer Institute Eindhoven 5600AXThe Netherlands Department of Mechanical Engineering Universitas Islam IndonesiaYogyakarta 55584Indonesia Department of Mechanical Engineering Imperial College LondonLondon SW72AZUnited Kingdom

Friction between two contacting surfaces is studied *** of the k n o w n friction theories is Amontons,law which states that the friction force is proportional to the normal ***,Amontons7 law has been found to be invalid for *** the present study,the validity of Amontons7 law for short-cut aramid fiber reinforced elastomers is *** types of fillers are used to reinforce the elastomers,namely highly dispersible silica and short-cut aramid ***-cut aramid fibers with two different surface treatments are used,namely non-reactive fibers with standard oily finish(SF-fibers)and fibers treated with an epoxy coating(EF-fibers).A pin-on-disc tribometer is used to investigate the frictional behavior of the composites in sliding contact with a granite counter *** results show that,after the run-in phase,Amontons,law is valid for those composites that are reinforced by short-cut aramid fibers(without reinforcing filler,i.e.,silica)if the contact pressure is below a threshold ***,once the contact pressure exceeds this threshold value,Amontons'law will be *** threshold contact pressure of the composites containing EF-fibers is higher than of the composites containing *** composites that are reinforced by silica and short-cut aramid fibers do not follow Amontons7 law.

关键词： Amontons's law elastomer epoxy coated fiber short-cut aramid fiber

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

表面活化的胶粉:橡胶回收的新进展

橡胶参考资料 1997年第8期27卷 15-21页

作者： wilma dierkes 马翔

前言现代科学推动了回收材料的再利用,其中包括以各种方法回收的橡胶。例如,许多地区已颁布了环保条例,不允许深埋废轮胎和其它废橡胶,要求将其回收。但是最有效的还是市场的推动。

关键词：橡胶胶粉表面活化废橡胶回收废物处理

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

再生IIR在轮胎气密层中的应用

轮胎工业 2001年第6期21卷 353-356页

作者： HenkJan Manuel wilma dierkes 赵敏涂学忠

再生IIR是轮胎工业中广泛应用的一种重要配合剂。用再生IIR部分替代IIR或BIIR可改善胶料工艺性能 ,并对胶料的某些非常重要的性能 (包括胶料成本 )有着积极的影响。　　对气密层来说 ,最有意义的工艺性能改进是提高了轮胎成型和硫化过... 详细信息

再生IIR是轮胎工业中广泛应用的一种重要配合剂。用再生IIR部分替代IIR或BIIR可改善胶料工艺性能 ,并对胶料的某些非常重要的性能 (包括胶料成本 )有着积极的影响。　　对气密层来说 ,最有意义的工艺性能改进是提高了轮胎成型和硫化过程中的气密性。含有再生IIR的气密层胶料具有较低的透气率 ,使制造商能够减薄气密层 ,同时不降低其气密性。胶料的耐老化性能也提高了 ,特别是老化后的屈挠疲劳寿命大大提高。

关键词：轮胎气密层再生ⅡR 配合剂工艺性能

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

白炭黑填充天然橡胶母炼胶

现代橡胶技术 2019年第3期45卷 40-45页

作者：赵梦梦 Suyanti Hersanto wilma dierkes Wisut kaewsakul

混炼传统的白炭黑填充胶料需要长的混炼周期,而配合预硅烷化白炭黑和母炼胶的胶料需要非常短的混炼周期。极性较高的加工助剂Ultra-DFR90特别适用于配合母炼胶的胶料,所需的混炼时间非常短。总之,以非常短混炼周期混炼配合母炼胶的胶料... 详细信息

混炼传统的白炭黑填充胶料需要长的混炼周期,而配合预硅烷化白炭黑和母炼胶的胶料需要非常短的混炼周期。极性较高的加工助剂Ultra-DFR90特别适用于配合母炼胶的胶料,所需的混炼时间非常短。总之,以非常短混炼周期混炼配合母炼胶的胶料其性能与用长混炼周期混炼的传统胶料的性能相当,且具有生产周期短、胶料加工性能好等优点。因此,与传统的白炭黑/硅烷体系相比,天然橡胶-白炭黑母炼胶是一种较好的替代材料。

关键词：白炭黑填充天然橡胶母炼胶加工助剂混炼工艺性能

确定平衡炭黑填充NR/BR航空轮胎胎面胶性能的关键因素

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代橡胶技术 2020年第3期46卷 20-30页

作者：伍少海(编译) I.Indriasri Wisut kaewsakul wilma dierkes 不详

实验设计(DOE)是制定平衡炭黑填充航空轮胎胎面胶所需特性的最佳参数设置的合适工具。在实验设计研究中发现,转子转速和填料混合时间是影响航空轮胎胎面胶性能的最重要因子。通过优化这些因子的设定条件,可以满足航空轮胎胎面应用所需... 详细信息

实验设计(DOE)是制定平衡炭黑填充航空轮胎胎面胶所需特性的最佳参数设置的合适工具。在实验设计研究中发现,转子转速和填料混合时间是影响航空轮胎胎面胶性能的最重要因子。通过优化这些因子的设定条件,可以满足航空轮胎胎面应用所需的性能。航空轮胎胎面胶研究的发展趋势是滞后损失(tanδ)尽可能低,耐磨性尽可能高,今后仍需进一步优化配方和改善加工工艺。通过在炭黑填充混炼胶中掺入一小部分白炭黑、适量的硅烷偶联剂和树脂是在保持高耐磨性的前提下进一步降低滞后损失的方法。

关键词：航空轮胎胎面胶性能实验设计优化配方

Innovative immunohistochemistry identifies MMP-9 expressing macrophages at the invasive front of murine HCC

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Hepatology 2010年第5期2卷 175-179页

作者： Martin Roderfeld Timo Rath Frank Lammert Christian dierkes Jürgen Graf Elke Roeb Justus-Liebig-University Giessen Department of Medicine ⅡGastroenterologyGiessen 35385Germany Department of Internal Medicine Ⅱ Saarland University HospitalSaarland University Justus-Liebig-University Giessen Department of Pathology Philipps-University Marburg Department of Anaesthesiology and Intensive Care35033 Marburg and Pas-senger Medical CareDeutsche Lufthansa AGFrankfurt 60546Germany

AIM:To investigate the proteolytic contribution of tumor-associated macrophages(TAM)in tumor invasion,we analyzed whether TAM at the invasive front of small HCC in Abcb4-/--mice show an enhanced expression of MMP-9. METHODS:Liver cryosections of the hepatocellular carcinoma(HCC)invasive front from 12 mo old Abcb4-/--mice were stained for collagen typeⅠand MMP-9 using Alexa488 and Alexa568 labeled secondary ***,the Alexa568 dye was bleached and the macrophage marker F4/80 was visualized using Alexa568 labeled secondary ***, photographs of the invasive tumor front were digitally overlaid and analyzed. RESULTS:After complete bleaching of the primary dye,specific fluorescence staining of a third antigen, here F4/80,was successfully performed on the same histological *** this method,we were able to identify conglomerates of matrix metalloproteinase (MMP-9)expressing macrophages within the tumor capsule of HCC. CONCLUSION:MMP-9 expressing macrophages are involved in matrix remodelling at the invasive tumor front of *** described staining protocol provides a simple yet powerful extension of conventional immuno-histochemistry,facilitating visualization of at least three different antigens plus nuclei in one single histological section.

关键词： Fluorescence staining Hepatocellular carcinoma Matrix metalloproteinase Tumor associated macrophages

Saving the PRC from a Gasoline Economy Hydrogen Makes Sense for China’s Automobility

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Saving the PRC from a Gasoline Economy Hydrogen Makes Sense ...