期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
Effect of Cold Plasma on Binding Strength of Bamboo 被引量:6
1
作者 王洪艳 杜官本 李琴 《Agricultural Science & Technology》 CAS 2011年第11期1741-1743,共3页
[Objective] The paper was to study the effect of cold plasma on binding strength of bamboo. [Method] The bamboos were treated by 4 kinds of cold plasma nitrogen, oxygen, ammonia and argon, and the changes of contact a... [Objective] The paper was to study the effect of cold plasma on binding strength of bamboo. [Method] The bamboos were treated by 4 kinds of cold plasma nitrogen, oxygen, ammonia and argon, and the changes of contact angle and binding strength of bamboos before and after treatment were tested. [Result] Oxygen cold plasma treatment could increase binding strength of bamboo by 25%-30%. The cold plasma treatment was very fast and effective, but the changes of contact angle was not great in this experiment. [Conclusion] Cold plasma treatment could increase the binding strength of bamboo. 展开更多
关键词 Cold plasma BAMBOO binding strength Contact bangle
下载PDF
Adsorption/reaction energetics measured by microcalorimetry and correlated with reactivity on supported catalysts: A review 被引量:1
2
作者 李林 林坚 +3 位作者 李筱玉 王爱琴 王晓东 张涛 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第12期2039-2052,共14页
The formations and transformations of the chemical bonds of reactants and intermediates on cata- lyst surfaces occur in conjunction with the evolution of heat during catalytic reactions. Measure- ment of this evolved ... The formations and transformations of the chemical bonds of reactants and intermediates on cata- lyst surfaces occur in conjunction with the evolution of heat during catalytic reactions. Measure- ment of this evolved heat is helpful in terms of understanding the nature of the interactions be- tween the catalyst and the adsorbed species, and provides insights into the reactivity of the catalyst. Although various techniques have previously been applied to assessments of evolved heat, direct measurements using a Tian-Calvet microcalorimeter are currently the most reliable method for this purpose. In this review, we summarize the relationship between the adsorption/reaction energetics determined by microcalorimetry and the reactivities of supported catalysts, and examine the im- portant role of microcalorimetry in understanding catalytic performance from the energetic point of view. 展开更多
关键词 Catalysis Microcalorimetry Reactivity Energetics binding strength Catalyst characterization
下载PDF
Enhanced bioactivity and interfacial bonding strength of Ti3Zr2Sn3Mo25Nb alloy through graded porosity and surface bioactivation 被引量:3
3
作者 Sen Yu Zhe Yu +6 位作者 Dagang Guo Hui Zhu Minghua Zhang Jianye Han Zhentao Yu Yemin Cao Gui Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第5期137-149,共13页
The gradient porous Ti3Zr2Sn3Mo25Nb(TLM)alloy rods were fabricated through sintering the alloyed powder to a solid core.The porous sample was then modified by a Micro Arc Oxidation(MAO)treatment in an electrolyte cont... The gradient porous Ti3Zr2Sn3Mo25Nb(TLM)alloy rods were fabricated through sintering the alloyed powder to a solid core.The porous sample was then modified by a Micro Arc Oxidation(MAO)treatment in an electrolyte containing calcium and phosphate,a hydrothermal treatment enabled secondary microporous hydroxyapatite(HA)coating,and a further bone morphogenetic protein-2(BMP-2)loading treatment through immersion and freeze-drying.The treatment led to an orderly secondary microporous coating containing HA nano-particles and evenly distributed BMP-2 in the porous coatings.As a result,osteoblasts could adhere and grow well on the coatings with a high cell adhesion rate and cell functional activity.The in-situ shear testing indicated that the interfacial strength had been enhanced significantly.Improvement of the bond formation and osseointegration with the titanium implant is attributed to increased surface area for the cell to attach,creating voids for the cell to grow in,and activating titanium surface by introducing bioactive ingredients such as HA and BMP-2. 展开更多
关键词 Graded porosity titanium Secondary microporous Bioactivity Ti3Zr2Sn3Mo25Nb alloy Interface binding strength
原文传递
Adsorption and Desorption of Mercury(Ⅱ) in Three Forest Soils in Shandong Province,China 被引量:4
4
作者 XUE Tong WANG Ren-Qing +1 位作者 ZHANG Meng-Meng DAI Jiu-Lan 《Pedosphere》 SCIE CAS CSCD 2013年第2期265-272,共8页
As one of the most toxic heavy metals with persistence, bioaccumulation, and toxicity in environment, mercury and its envi- ronmental problems have caused a global concern. To fully understand the behavior and fate of... As one of the most toxic heavy metals with persistence, bioaccumulation, and toxicity in environment, mercury and its envi- ronmental problems have caused a global concern. To fully understand the behavior and fate of mercury (Hg)(II) in forest soils, a series of batch experiments were conducted to determine the adsorption and desorption characteristics of Hg(II) by three dark brown forest soils from Mount Taishan, Laoshan Mountain, and Fanggan Village in Shandong Province, China. The adsorption solution was prepared using 0.1 mol L-1 NaNO3 as background electrolyte, with Hg(II) at rising concentration gradients of 0.0, 2.0, 4.0, 6.0, 8.0, and 10.0 mg L-1. Fourier transform infrared (FTIR) spectroscopy was adopted to characterize the soil samples and soil-Hg complexes. It was found that Hg(II) adsorption isotherms could be well fitted with both Langmuir and Freundlich equations. The soil from Mount Taishan had the largest potential Hg(II) adsorption capacity, though with less adsorptive intensity. The percentages of Hg(II) desorbed from all soil samples were less than 0.6~, which suggested that all the soils studied had a high binding strength for Hg(II). The soil from Mount Taishan had a higher Hg(II) desorption capacity than the other soils, which indicated that the Hg(II) deposited on the topsoil of Mount Taishan from atmosphere may easily discharge to surface water through runoff. Results of the FTIR spectroscopy showed that the three soils contained the same functional groups. The relative absorbencies of soil-Hg complexes changed significantly compared with those of the soil samples and the adsorption of Hg(II) mainly acted on the O-H, C-O, and C=O groups of the soils. 展开更多
关键词 atmosphere deposition binding strength FTIR spectroscopy functional groups soil^Hg complex
原文传递
Cascade biocatalysis for production of enantiopure(S)-2-hydroxybutyric acid using recombinant Escherichia coli with a tunable multi-enzyme-coordinate expression system 被引量:1
5
作者 Lingzhi Tian Junping Zhou +3 位作者 Taowei Yang Xian Zhang Meijuan Xu Zhiming Rao 《Systems Microbiology and Biomanufacturing》 2021年第2期234-244,共11页
Racemize 2-hydroxybutyric acid is usually synthesized by organic methods and needs additional deracemization to obtain optically pure enantiomers for industrial application.Here we present a cascade biocatalysis syste... Racemize 2-hydroxybutyric acid is usually synthesized by organic methods and needs additional deracemization to obtain optically pure enantiomers for industrial application.Here we present a cascade biocatalysis system in Escherichia coli BL21 which employed L-threonine deaminase(TD),NAD-dependent L-lactate dehydrogenase(LDH)and alcohol dehydrogenase(ADH)for producing optically pure(S)-2-hydroxybutyric acid((S)-2-HBA)from bulk chemical L-threonine.To solve the mismatch in the conversion rate and the consumption rate of intermediate 2-oxobutyric acid(2-OBA)formed in the multi-enzyme catalysis reaction,ribosome binding site regulation strategy was explored to control TD expression levels,achieving an eightfold alteration in the conversion rate of 2-OBA.With the optimized activity ratio of the three enzymes and using ADH for NADH regeneration,the recombinant strain ADH-r53 showed increased production of(S)-2-HBA with the highest titer of 129 g/L and molar yield of 93%within 24 h,which is approximately 1.65 times that of the highest yield reported so far.Moreover,(S)-2-HBA could easily be purified by distillation,making it have great potential for industrial application.Additionally,our results indicated that constructing a tunable multi-enzyme-coordinate expression system in single cell had great significance in biocatalysis of hydroxyl acids. 展开更多
关键词 Cascade biocatalysis (S)-2-hydroxybutyric acid Multi-enzyme-coordinate expression system NADH regeneration Ribosome binding site strength
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部