An exploratory study of buyers’ participation intentions in reputation systems: The relationship quality perspective

Drawing upon a relationship quality framework, this study identifies how satisfaction, trust and different styles of handling conflict influence online buyers’ participation intentions in reputation systems associated with a C2C online shopping platform. Furthermore, we investigate how these effects are moderated by social conformity and the perceived value of knowledge. The results of a survey of 269 online buyers indicate that satisfaction, trust and an accommodating conflict handling style positively impact the intention to submit positive ratings, whereas an avoiding conflict handling style negatively affects the intention to submit positive ratings. Implications and suggestions for future research are provided.     

PVC防水卷材的配方研究

研究了利用废旧软聚氯乙烯回收料(旧料)生产PVC塑料防水卷材的配方及其对卷材拉伸性能的影响。结果表明,PVC塑料卷材的拉伸强度和断裂伸长率随PVC树脂添加比例增加而提高,而相同添加量的SG-3型PVC树脂比SG-5型PVC树脂的拉伸性能高；在试验范围内,增塑剂用量增加,卷材的拉伸强度降低,伸长率先升后降；添加CPE能提高PVC卷材伸长率,但拉伸强度有所下降。当CaCO_3用量低于20份时,卷材的拉伸强度和伸长率随CaCO_3添加量增加而提高。PVC防水卷材的优选配方(质量份)：旧料85份,PVC树脂(SG-3型)15份,DOP 5份,CPE 3份,稳定剂(TLS)0．6份,其它助剂适量。     

Hydrogen evolution during the oxidation of formaldehyde on Au:: The influence of single crystal structure and Tl-upd

Hydrogen evolution during formaldehyde oxidation in alkaline solution has been monitored by Differential Electrochemical Mass Spectrometry on Au(111) and polycrystalline gold. The current efficiency for hydrogen evolution increases with higher concentration and is in the same range on both, polycrystalline Au and Au(111) electrode. The onset potentials and half-wave potentials are higher on Au(111). Reaction orders for the faradaic current on the bare gold electrodes have been determined as 0.21 for higher and 0.76 for lower concentrations. Reaction orders for hydrogen evolution during formaldehyde oxidation are 1.4 times higher in each case. Tafel slopes in the range of 140-160 mV are found. This signifies that the first reaction step involving the formation of adsorbed hydrogen is largely determining the overall reaction rate. In the presence of thallium adlayers hydrogen evolution from formaldehyde oxidation is largely suppressed. On the thallium modified polycrystalline Au, formaldehyde oxidation is shifted for 100 mV to higher potentials where Tl is partially desorbed and hydroxide is coadsorbed on the modified surface. On thallium modified Au(111), a similar process takes place, but in the same potential region as the onset of formaldehyde oxidation on the bare surface and therefore the formaldehyde oxidation is only slightly shifted. Tafel slopes are decreased to 80 mV/dec in the presence of thallium. In the presence of adsorbed thallium, the first reaction step is in equilibrium, the coverage with adsorbed hydrogen is smaller and its recombination to H₂ is largely suppressed.     

EPVC系列旋风管的结构优化研究

介绍了ＥＰＶＣ系列导叶式旋风管的叶片形状、优化的叶片出口参数间的匹配关系以及新的防返混锥排尘结构，总结了无泄料盘时的排尘机理及尺寸设计要点。另外，还简单介绍了旋风管装置的工业应用情况。     

EVA共聚物的性能与应用

EVA共聚物广泛用作电线电缆中的热收缩材料,半导电屏蔽材料和阻燃绝缘材料,本文简要综述EVA共聚物的基本性能。     

透明聚烯烃用成核剂合成的研究

介绍了聚烯烃成核剂合成反应所用助剂选择,反应条件的确立,利用均匀设计实现最佳配比实验,对不同侧基苯甲醛缩合反应进行了研究。     

酸性气流脱除物STW-3#对NR硫化性能影响的研究

酸性气流脱除物是净化天然气、合成气、煤气时脱除的物质，STW-3#是由该物质制成的样品之一。就STW-3#对NR硫化性能的影响进行了研究。结果表明，STW-3#对NR有较好的硫化促进特性和一定的软化增塑作用；其用量3.0份以下时，硫化特性较差，3．0份以上时硫化特性较好，但超过4．0份时有粘辊和喷霜现象。它与促进剂M并用时，硫化特性与促进剂D相似。     

Growth and formation mechanism of sea urchin-like ZnO nanostructures on Si

Sea urchin-like nanostructures of ZnO consisting of ZnO nanowires with blunt faceted ends were grown on Si (100) substrates by oxidation of metallic Zn at 600 °C. ZnO nanowires having a diameter of 30–60 nm and length of 2–4 Μm were in similar shape with uniform diameter along its entire length with well faceted blunt ends. X-ray diffraction and transmission electron microscope analysis showed that the as-grown nanostructures were highly crystalline with wurtzite hexagonal structure having lattice constants of a=b=3.25 å and c=5.21 å. Room temperature photoluminescence (PL) measurements showed a weak near band-edge emission at 380 nm, but a strong green emission at 500–530 nm. A model for vapor-solid (VS) growth mechanism of ZnO nanowires was presented, in which nucleation of ZnO is crucial for the growth of the nanostructures.     

超声振动对聚合物结构性能的影响

介绍了聚合物挤出成型过程中的超声振动技术，并对挤出模头引入超声振动后对聚合物物理机械性能、相容性、结晶性能的影响进行了评述。     

PP/UHMWPE共混物力学性能的研究

采用不同结构的聚丙烯(PP)分别与不同流动性能的超高摩尔质量聚乙烯(UHMWPE)进行共混，对共混物的力学性能进行了研究。发现PP和UHMWPE类型的适当匹配对共混物性能的提高非常重要。流动性较好的UHMWPE对熔体质量流动速率较小的嵌段共聚型PP(PPB)增韧增强效果突出，常温缺口冲击强度可达74．2kJ／m^2，断裂伸长率大于700％；同时共混物的强度和刚性也有一定程度的提高。在PPB／UHMWPE二元共混物中加入适当线性低密度聚乙烯(LLDPE)，能够起到“减粘”和“增容”作用，有利于共混物性能，尤其是抗冲性能的进一步提高。