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Evidence of Dual Scale Porous Mechanisms During Fluid Migration in Hardwood Species (Ⅱ) A Dual Scale Computational Model to Describe the Experimental Results

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Chinese Journal of Chemical Engineering 2004年第6期12卷 783-791页

作者： Patrick PERR lermab-UMR INRA/ENGREF/UHP 1093 ENGREF-INRA-14 rue Girardet 54042 Nancy Cedex France

The second part of this paper is devoted to the computational modelling of transient water migration in hardwood. During re-saturation, the moisture content, measured during the process by using X-ray attenuation (see part 1 of this paper), increases quickly very close to the cavity, but requires a very long time for the remaining part of the sample to absorb the moisture in wetting. For this configuration and this material, the macroscopic approach fails. Consequently, a dual-porosity approach is proposed. The computational domain uses a 2-D axisymmetric configuration for which the axial coordinate represents the macroscopic longitudinal direction of the sample whereas the radial coordinate allows the slow migration from each active vessel towards the fibre zone to be considered. The latter is a microscopic space variable. The moisture content field evolution depicts clearly the dual scale mechanisms:a very fast longitudinal migration in the vessel followed by a slow migration from the vessel towards the fibre *** macroscopic moisture content field resulting from this dual scale mechanism is in quite good agreement with the experimental data.

关键词： fluid migration dual-porosity computational model hardwood vessel fibre

Feasibility Study for a Hybrid Power Plant(PV-Wind-Diesel-Storage)Connected to the Electricity Grid

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1607-1617页

作者： Fahad Maoulida Kassim Mohamed Aboudou Djedjig Rabah Mohammed El-Ganaoui Laboratory LEMAFaculty of Sciences and TechniquesUniversity of ComorosMoroniComoros Laboratory LERMABIUT Henri Poincaréof LongwyUniversity of LorraineNancyFrance IREMIS Institute CUFRUniversity of MayotteDembeni MayotteFrance

In this work,we present a feasibility study for a new hybrid power plant(PV-Wind-Diesel-Storage)directly connected to the electrical *** simulations are performed to verify the performance of the hybrid system under different scenarios using real meteorological *** is shown that the performances of the hybrid system connected to the electrical network depend obviously on the available energy resources and constraints because the renewable energies are *** addition,the price of the kWh of electricity supplied by the hybrid system is determined,which amounts to$0.209/kWh,which is very cost effective and satisfactory for the considered sample conditions(Comoros Island).

关键词： Hybrid energy renewable energy HOMER connected grid

An Eco-Friendly Wood Adhesive from Alfalfa Leaf Protein

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Journal of Renewable Materials 2020年第11期8卷 1429-1441页

作者： Bengang Zhang Xuedong Xi Zhigang Wu Hong Lei Lifen Li Meifen Tian College of Forestry Guizhou UniversityGuiyang550025China Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry UniversityKunming650224China ENSTIB-lermab University of LorraineEpinal88051France

According to the preparation method commonly used for soy proteinαbased adhesives,alfalfa leaf protein was used as the raw material to prepare alfalfa leaf protein-based wood *** scanning calorimetry analyzer(DSC),X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTαIR)were used to characterize properties of the alfalfa leaf protein-based adhesive in this *** results revealed the following:(1)Chemical compositions and chemical structures of the alfalfa leaf protein were basically identical with those of the soy protein,both belonging to spherical proteins with the basis and potential for protein adhesives preparation,and spatial cross-linked network structures would be easily formed.(2)Alfalfa leaf protein and soy protein adhesives had the similar curing behaviors,curing temperature of alfalfa leaf protein-based adhesive was relaαtively lower,and the heating rate had minor influence on curing temperature of alfalfa leaf protein-based *** different heating rates,change tendencies of curing reaction degrees of both the two adhesives were not totally the same.(3)Activation energy and reaction frequency factor of the alfalfa leaf protein-based adhesive were higher than those of soy protein-based adhesive,indicating that the curing reaction of the alfalfa leaf protein adhesive was more difficult than soy protein-based adhesive,thus the dry shear strength and water resistance of alfalfa protein-based adhesive were lower than those of soy protein-based *** models of curing reactions of alfalfa leaf protein-based adhesive and soy protein-based adhesive are dα=dt/1.06×10^(13)e^(-97370/RT)(1-α)^(0.938) and dα/dt=1.09×10^(11)e^(-84260/RT) 1-α)^(0.928) *** results of this study will expand the selection of raw materials for protein-based wood adhesives.

关键词： Alfalfa leaf protein wood adhesive curing properties thermal performance

Effects of Steam Heat-Treatment on Properties of Pinus massoniana Wood and Its Bonding Performance

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Journal of Renewable Materials 2021年第4期9卷 789-801页

作者： Meifen Tian Bengang Zhang Zhigang Wu Liping Yu Lifen Li Xuedong Xi College of Forestry Guizhou UniversityGuiyang550025China Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry UniversityKunming650224China ENSTIB-lermab University of LorraineEpinal88051France

Pinus massoniana wood was modified by steam heat-treatment at 160℃,180℃,200℃ and 220℃ respectively and effects of the changes of density,pH,surface wettability and apparent morphology of Pinus massoniana heat-treated wood on its bonding performance were studied in this *** results showed that Pinus massoniana wood underwent a series of physical and chemical changes during heat-treatment as the the following:(1)The degradation of hemicellulose and cellulose with low degree of polymerization,degradation and migration of the extract resulting in the decline of density and pH of heat-treated Pinus massoniana wood.(2)Brittle fracture occured on the cell wall surface,and the pit collapse,shrink and deformation,resulting in the formation of roughness and porosity on the wood surface.(3)The surface energy decreased with the improvement of temperature,the surface wettability of Pinus massoniana wood treated at 160℃–180℃ was good,while that at 200℃–220℃ showed hydrophobicity.(4)Changes of density,pH,surface roughness and porosity,and wettability resulted in a reduction in the bonding strength and reliability of heat-treated Pinus massoniana wood with MUF resin adhesive.(5)When the temperature was at 160℃–180℃,the better wettability of heat-treated Pinus massoniana wood could guarantee the better bonding performance.

关键词： Pinus massoniana wood heat-treatment bonding performance

Experimental investigation of hygrothermal behavior of wooden-frame house under real climate conditions

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Energy and Built Environment 2023年第1期4卷 122-129页

作者： Mourad Rahim Rabah Djedjig Dongxia Wu Rachid Bennacer Mohammed EL Ganaoui University of Lorraine LERMABIUT H Poincaréde Longwy168 Rue de LorraineCosnes et Romain54400 LongwyFrance University of Paris-Saclay ENS Paris-SaclayCNRSLMT91190 Gif-sur-YvetteFrance

This paper deals with the experimental investigation of hygrothermal behavior of wooden-frame building *** experiment was based on in-situ monitoring of a full size experimental monozone house built at the University of *** in temperature and relative humidity inside and outside the envelope were logged simultaneously with local meteorological *** showed the high coupling between temperature and relative humidity variations within the envelope *** overall hygrothermal response of the wall highlighted an interesting hygrothermal dynamic behavior of the envelope which may contribute to mitigate variations of relative humidity inside the ***,relative humidity evolves within a range of values that can lead to mold growth at a certain position which may alter wooden envelope life.

关键词： 3 hygrothermal behavior Heat and mass transfer Wood Bio-based building envelope

Effect of Amine Type on Lignin Modification to Evaluate Its Reactivity in Polyol Construction for Non-Isocyanate Polyurethanes(NIPU)

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Journal of Renewable Materials 2023年第5期11卷 2171-2190页

作者： Saeed Kazemi Najafi Farhood Najafi Antonio Pizzi Fatemeh Hassani Khorshidi Rabi Behrooz Department of Wood Science and Technology Faculty of Natural ResourcesTarbiat Modares UniversityTehranIran Department of Resin and Additives Institute for Color Science and TechnologyTehranIran lermab University of LorraineBlvd des AiguillettesNancyFrance

Polyols are groups of organic compounds which contain carbon and are randomly linked to other atoms,especially carbon-carbon and *** compounds are mainly used as reactants to make other *** biopolymers,lignin is regarded as the base of a new polymer in polyol *** present study aimed to investigate the effects of amine type(diethylenetriamine and ethylenediamine)on the modification of lignin-based polyols,so as to provide an alternative to petroleum polyols and,in turn,increase functional groups and reduce their harm to humans’health and the *** this aim,first,lignin was extracted from raw ***,the extracted lignin was reacted with diethylenetriamine(DETA)and ethylenediamine(EDA).Finally,the Mannich method was used for the reaction between amine lignin and propylene *** results of the Fourier Transform Infrared(FTIR)spectroscopy analysis showed that modification with DETA led to more structural change in lignin and peak 1100 indicates the presence of C–O bond related to urethane bonds in modified ***,adding propylene carbonate to aminated lignin did not result in much change in the results of the FTIR ***,urethane bonds can be seen in the results of GPC at 400℃–500℃.Furthermore,a slight decrease in thermal stability was observed in lignin modified with amine and propylene carbonate,compared to the raw lignin sample.

关键词： Polyol lignin diethylenetriamine ethylenediamine propylene carbonate polyurethanes NIPU

Plasma Treatment Induced Chemical Changes of Alkali Lignin to Enhance the Performances of Lignin-Phenol-Formaldehyde Resin Adhesive

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Journal of Renewable Materials 2021年第11期9卷 1959-1972页

作者： Zhigang Wu Sicheng Chen Jiankun Liang Lifen Li Xuedong Xi Xue Deng Bengang Zhang Hong Lei College of Forestry Guizhou UniversityGuiyang550025China Kaili University Qiandongnan556011China ENSTIB-lermab University of LorraineEpinal88051France Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products Southwest Forestry UniversityKunming650224China

Alkali lignin was processed by plasma and then used in modification of phenol formaldehyde resin in this *** structural changes of lignin which was processed by plasma as well as bonding strength,tensile property,curing performance and thermal property of the prepared phenol formaldehyde resin which was modified by the plasma processed lignin were *** demonstrated that:(1)Alkali lignin was degraded after the plasma *** original groups were destroyed,and the aromatic rings collected abundant free radicals and oxygen-containing functional groups like hydroxyls,carbonyls,carboxyls and acyls were introduced into increase the reaction activity of lignin significantly.(2)The introduction of alkali lignin decreased the free formaldehyde content and increased bonding strength and toughness of the prepared phenol formaldehyde resin,especially after the introduction of lignin treated with plasma.(3)The introduction of alkali lignin led to high curing temperature for the prepared phenol formaldehyde resin,but that was reduced by the plasma processed alkali lignin.(4)The introduction of alkali lignin could also increase thermal stability of phenol formaldehyde resin,but that was modified by plasma processed alkali lignin was better than the unprocessed *** on the results,the plasma processed lignin was used to modify phenol formaldehyde resin,which could increase the strength and toughness of phenol formaldehyde resin significantly.

关键词： Alkali lignin plasma phenol formaldehyde resin bonding performance tensile property

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室外涂饰木材的抗老化性能

南京林业大学学报（自然科学版） 2007年第4期31卷 61-64页

作者：陆步云 MERLIN A. PERRE P. CHRUSCIEL L. 周定国南京林业大学木材工业学院 lermab Uhp-Nancy1 Nancy54600France lermab Uhp-Nancy1

通过测量气体渗透值研究室外涂饰木材在老化过程中的性能表现。结果表明:涂层渗透性与涂料的抗老化能力无直接关系;木材涂饰以后气体渗透值比未涂饰时均有所下降,在老化过程中涂饰木材的气体渗透值随着老化时间的增加而增加。木材径切... 详细信息

通过测量气体渗透值研究室外涂饰木材在老化过程中的性能表现。结果表明:涂层渗透性与涂料的抗老化能力无直接关系;木材涂饰以后气体渗透值比未涂饰时均有所下降,在老化过程中涂饰木材的气体渗透值随着老化时间的增加而增加。木材径切面上的漆膜比弦切面上的抗老化,径切面上的渗透变化率kt和老化时间的关系为:渗透变化率在老化初期增长趋势很快,随着老化时间的增加逐渐变缓,到老化后期甚至出现渗透变化率下降的趋势。

关键词：室外涂饰木材气体渗透抗老化

Tannin Nanoparticles(NP99)Enhances the Anticancer Effect of Tamoxifen on ER+Breast Cancer Cells

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Journal of Renewable Materials 2021年第12期9卷 2077-2092页

作者： Faizah A.AlMalki Aziza M.Hassan Zeinab M.Klaab Soliman Abdulla Antonio Pizzi Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Biotechnology College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Physics Faculty of ScienceAlexandria UniversityAlexandriaEgypt ENSTIB-lermab University of LorraineEpinal88051France

Recently,natural substances in the form of nanoparticles are increasingly being used in different field,particularly in medicines to enhance their beneficial effects in treatment and *** cells of the breast(MCF-7)have been chosen to be examined and treated in vitro with conventional drug Tamoxifen(Tam)and tannin nanoparticles extract(NP99)individually or in *** reagent has been applied to assess the cell viability and propagation percentage,DNA fragmentation and mRNA relative expression of apoptotic genes to study the cell death *** results showed that Tam and tannin NP99 triggered cytotoxic activity towards the MCF7 *** reduce the viability and induced high potent repressive activity on cell proliferation percentage and induced apoptosis as indicated by rising the percentage in DNA *** of NP99 extract exhibited its effect in a dose and *** combined treatment of Tam and NP99 were much more efficient than individual *** could be concluded that NP99 is considered a promising natural anticancer agent as a new tool in therapeutic strategies.

关键词： Condensed tannin nanoparticles tamoxifen MCF-7 cells anticancer