检索结果-南通市图书馆

Piecewise Smooth Dynamical Systems Modeling Based on Putzer and Fibonacci-Horner Theorems:DC-DC Converters Case

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2016年第3期13卷 246-258页

作者： Abdelkader Khoudiri Kamel Guesmi Djillali mahi Department of Sciences and Techniques Djelfa University CRe STIC IUT de Troyes

The paper deals with the problem of switched dynamical systems modeling especially in DC-DC converters case study consideration. It presents two approaches to describe accurately the behavior of this class of systems. To clarify the paper＇s contribution, the proposed approaches are validated through simulations and experimental results. A comparative study, between the obtained results and those of other techniques from the literature, is given to evaluate the performances of the studied approaches.

关键词： Switched systems DC-DC converters modeling Cayley-Hamilton theorem Putzer's theorem Fibonacci-Horner decom-position theorem.

Valorization of a Good Bioceramic from Moroccan Waste Fish Bone by a Heat Treatment Method

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

Journal of Renewable Materials 2019年第1期7卷 1-7页

作者： Kaoutar Kara Fatiha Ouanji El Mostapha LOTFI Mohammed El mahi Mohamed Kacimi Laboratory of Spectroscopy Molecular ModelingMaterialsNanomaterialsWater and EnvironmentEnvironmental Materials TeamENSETMohammed V UniversityRabatMorocco Laboratory of Nanomaterial Nanotechnology and EnvironmentPhysico-chemical of Material and Catalysis(URAC26)Faculty of SciencesUniversity of Mohammed VRabat.Morocco

A tricalcium phosphate(TCP)material was produced from sardine and mackerel waste using a heat treatment method after a Soxhlet extraction to obtain the non-soluble portion of fish *** bones were annealed at temperatures between 400℃ and 1200℃.The thermal analysis(TG-DTA)was carried out to investigate the thermal stability of TCP and to confirm the removal of organic matter from the raw *** calcined bones were characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),and field emission scanning electron microscopy(FESEM).The calcium to phosphorous weight ratio was determined by ***-IR and XRD confirmed the similarities to syntheticβ-TCP(JCPDS-09-169),FE-SEM results revealed the formation of nanostructured *** results suggest that varying the isolation temperature between 600-1200℃ has tremendous impact on the production of TCP from fish bone waste with the required properties.

关键词： Hydroxyapatite tri-calcium phosphate fish bone heat treatement bioceramic

Effect of Recycling Cycles on the Mechanical and Damping Properties of Flax Fibre Reinforced Elium Composite:Experimental and Numerical Studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2021年第4期9卷 695-721页

作者： Sami Allagui Abderrahim El mahi Jean-Luc Rebiere Moez Beyaoui Anas Bouguecha Mohamed Haddar Acoustics Laboratory of Le Mans University Le Mans UniversityLe Mans72085France Laboratory of Mechanics Modelling and Production National School of Engineering of SfaxSfax3038Tunisia

This manuscript deals with the effects of recycling on the static and dynamic properties of flax fibers reinforced thermoplastic *** corresponding thermoplastic used in this work is Elium ***’s the first liquid thermoplastic resin that allows the production of recycled composite parts with promising mechanical *** appeared on the resin market in *** until now,no studies were available concerning how it can be recycled and *** this study,a thermocompression recycling process was investigated and applied to Elium *** fiber-reinforced Elium composites were produced using a resin infusion process and were subjected to different thermomechanical recycling *** each material,five recycling operations were carried out on the raw material.A total of 10 different materials were investigated and tested by means of tensile and free vibration tests to evaluate the effect of recycling on their *** addition,a finite element model of the dynamic problem was developed to evaluate the loss factor and natural frequencies regarding different *** results obtained show that the failure tensile properties of Elium resin as well as flax fiber reinforced composites decrease during recycling ***,recycling induces a rise in the elastic ***,improvement in the dynamic stiffness was observed with recycling *** repeated recycling appeared to have negligible effects on the loss factor of the recycled *** results obtained from the experiment and the numerical analyses were in close agreement.

关键词： Recycling thermoplastic bio-composites thermocompression process tensile properties vibration loss factor

Damping Analysis and Failure Mechanism of 3D Printed Bio-Based Sandwich with Auxetic Core under Bending Fatigue Loading

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2021年第3期9卷 569-584页

作者： Khawla Essassi Jean-Luc Rebiere Abderrahim El mahi Mohamed Amine Ben Souf Anas Bouguecha Mohamed Haddar Acoustics Laboratory of Mans University(LAUM)-UMR CNRS Le Mans UniversityLe Mans6613France Laboratory of Mechanics Modeling and Production(LA2MP) National School of Engineers of SfaxUniversity of SfaxSfaxTunisia

Meta-sandwich composites with three-dimensional(3D)printed architecture structure are characterized by their high ability to absorb *** this paper,static and fatigue 3-point bending tests are implemented on a 3D printed sandwich composites with a re-entrant honeycomb *** skins,core and whole sandwich are manufactured using the same bio-based material which is polylactic acid with flax fiber *** tests are performed in order to evaluate the durability and the ability of this material to dissipate ***,static tests are conducted to study the bending behaviour of the sandwich beams,as well as to determine the failure parameters and the characteristic used in fatigue ***,fatigue analyses were carried out to determine the fatigue resistance of these *** effects of the core density on the stiffness,hysteresis loop,energy absorption and loss factor,for two loading level,are ***,the behaviour of this sandwich composite with re-entrant honeycomb core is compared with that of sandwiches with different core *** results show that sandwich with high core density dissipate more energy,which results higher loss *** determined properties offer the most sensitive indicators of sandwich composite damage during its *** work aims to determine the static and fatigue properties of this material,thus,study its potential applications in industry.

关键词： Auxetic structure fatigue damping bio-sandwich composite 3D printing

Analysis of promoter activity reveals that GmFTL2 expression differs from that of the known Flowering Locus T genes in soybean

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Crop Journal 2017年第5期5卷 438-447页

作者： Limin Liu Xiaomei Zhang Fulu Chen Asia Adam Elzamzami mahi Xiaoxia Wu Qingshan Chen Yong-Fu Fu College of Agriculture Northeast Agricultural University MOA Key Lab of Soybean Biology (Beijing) National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop ScienceChinese Academy of Agricultural Sciences

Regulation of flowering is one of the key issues in crop yield. The Floiuering Loews T(FT) gene is a well-known florigen, which integrates various signals from multiple flowering-regulation pathways to initiate flowering. We previously reported that there are at least six FT genes(GmFTLl-6) in soybean displaying flowering activity. However, the individual functions of genes GmFTLl-6 remain to be identified. In this study, we cloned the GmFTL2 promoter(GmFTLpro) from soybean(Glycine max) cultivar Tianlong 1 and analyzed its motifs bioinformatically and its expression patterns using both a transgenic approach and quantitative RT-PCR(qRT-PCR). In GmFTLpro::GUS transgenic lines, GUS signals were enriched in cotyledons, hypocotyledons, pollen, embryos, and root tips in a photoperiod-independent manner. qRT-PCR confirmed the GUS reporter results. Our results suggest that GmFTL2 expression is regulated by developmental and tissue-specific clues and plays roles in seedling establishment and the development of micro game tophytes, embryos, and roots.

关键词： Flowering Locus T Cotyledon Microgametophyte Embryo Root tip

On the use of ferroelectric material LiNbO3 as novel photocatalyst in wastewater-fed microbial fuel cells

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

Particuology 2017年第5期15卷 147-155页

作者： N.Touach V.M.Ortiz-Martinez M.J.Salar-Garcia A.Benzaouak F.Hernandez-Fernandez A.P.de Rios M.El mahi E.M.Lotfi Laboratory of Mechanics Processes and Industrial Process Team Chemical Sciences ENSET Mohammed V University in Rabat Morocco School of Chemical and Environmental Engineering Polytechnic University of Cartagena Campus Muralla Del Mar Murcia Spain University of Murcia Chemical Engineering Department Campus de Espinardo E-30071 Murcia Spain

In this work, the use of lithium niobate （LiNbO3）, a ferroelectric and photocatalyst material, is investi- gated as a new type of cathode catalyst for wastewater-fed single-chamber microbial fuel cells （MFCs）. Carbon cloth electrodes coated with LiNbO3 were studied with and without UV-vis irradiation to assess its photocatalytic behavior in these devices. The synthesized phase of LiNbO3 was characterized by X- ray diffraction, differential scanning calorimetry, particle size distribution, and transmission electron microscopy analyses. The MFC containing a LiNbO3-based cathode exhibited a maximum open circuit potential and power output of 400 mV and 131 mW/m^3, respectively, under irradiation. This cathode configuration also achieved the maximum chemical oxygen demand removal of 84% after 120 h of MFC operation. These results show that ferroelectric materials such as LiNbO3 could be used as cathode cat- alysts in MFC devices. As a complementary analysis, the removal of the heavy metals detected in the wastewater was also monitored.

关键词： Lithium niobate Ferroelectric material Photocatalyst Microbial fuel cell (MFC)Power outputWastewater treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

克隆病肠粘膜巨噬细胞的异常免疫调节作用

中华消化杂志 1993年第1期13卷 34-37页

作者：吴开春 mahi.,YR 西安市，第四军医大学西京医院 710032

分离提取8例克隆病（CD）、6例溃疡性结肠炎（UC）及10例正常肠粘膜单个核细胞（INT-MNC），并去除其中巨噬细胞，观察其对INT-MNC分泌免疫球蛋白（Ig）的作用。结果显示，与正常及UC不同，CD肠粘膜对美洲商陆（PWM）不产生Ig应答反应... 详细信息

分离提取8例克隆病（CD）、6例溃疡性结肠炎（UC）及10例正常肠粘膜单个核细胞（INT-MNC），并去除其中巨噬细胞，观察其对INT-MNC分泌免疫球蛋白（Ig）的作用。结果显示，与正常及UC不同，CD肠粘膜对美洲商陆（PWM）不产生Ig应答反应，若去除巨噬细胞，PWM刺激INT-MNC产生Ig的作用则又出现。提示肠道巨噬细胞在CD肠粘膜产生Ig过程中可能起负调节作用。

关键词：克隆病巨噬细胞肠粘膜免疫调节

Ferroelectric solid solution Li1-xTa1-xWxO3 as potential photocatalysts in microbial fuel cells:Effect of the W content

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第9期26卷 1985-1991页

作者： Abdellah Benzaouak Nour-Eddine Touach V.M.Ortiz-Martinez M.J.Salar-Garcia F.Hernandez-Fernandez A.P.de los Rios Mohammed El mahi El Mostapha Lotfi Laboratory of Mechanics and Industrial Processes Chemical Sciences Research TeamENSETMohammed V University in RabatMorocco Department of Chemical and Environmental Engineering Technical University of CartogenaCampus Muralla Del Mar MurdaSpain

Microbial fuel cells(MFCs)are bio-electrochemical systems that can directly convert the chemical energy contained in an effluent into bioelectricity by the action of *** performance of these devices is heavily impacted by the choice of the material that forms the *** work focuses on the assessment of ferroelectric and photocatalytic materials as a new class of non-precious catalysts for MFC cathode construction.A series of cathodes based on mixed oxide solid solution of LiTaO_3with WO_3formulated as Li_(1-x)Ta_(1-x)W_xO_3(x=0,0.10,0.20 and0.25),were prepared and investigated in *** catalyst phases were synthesized,identified and characterized by DRX,PSD,MET and UV–Vis absorption *** cathodes were tested as photoelectrocatalysts in the presence and in the absence of visible light in devices fed with industrial *** results revealed that the catalytic activity of the cathodes strongly depends on the ratio of substitution of W^(6+)in the LiTaO_*** maximum power densities generated by the MFC working with this series of cathodes increased from60.45 mW·m^(-3)for x=0.00(LiTaO_3)to 107.2 mW·m^(-3)for x=0.10,showing that insertion of W^(6+)in the tantalate matrix can improve the photocatalytic activity of this ***,MFCs operating under optimal conditions were capable of reducing the load of chemical oxygen demand by 79%(COD_(initial)=1030 mg·L^(-1)).

关键词： Ferroelectric materials Tantalate Photocathode Microbial fuel cell Bioenergy Wastewater treatment

Validation of Metformin Hydrochloride in Human Plasma by HPLC-Photo Diode Array （PDA） for Application of Bioequivalence Study

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

Journal of Life Sciences 2012年第1期6卷 20-27页

作者： Yahdiana Harahap Krisnasari Dianpratami mahi Wulandari Rina Rahmawati Department of Pharmacy University of Indonesia Depok Jakarta 16424 Indonesia

A sensitive and specific high performance liquid chromatography （HPLC） method was developed and validated for the simultaneous determination of metformin hydrochloride （HCI） in human plasma. The HPLC method consists of isocratic eluation with a mixture of 60% buffer （10 mM sodium dihyrogenphosphate-10 mM sodium dodecyl sulphate） and 40% acetonitrile with final pH 7.0 with flow rate of 1.0 mL/min on a Kromasil~ Akzo Nobel RP-18 （4.6 mm ID ~ 250 mm, 5 ~tm） column at an ambient temperature. Photo diode array detection was performed in program mode at 234 rim. The analyte and diazepam as internal standard （IS） were extracted from plasma using 10% trichloroacetic acid. The assay was linear over the therapeutic concentration range of 20-2,500 ng/mL for metformin HCI with correlation coefficient of r = 0.9999. Limit of quantitation was 20 ng/mL. The results obtained for intraJinter day accuracy and precision complied very well with the generally accepted criteria for bio-analytical assay. The method was applied to bioequivalence （BE） study of metformin HCI in healthy Indonesian volunteers after treatment with 750 mg XR metformin HCI. This BE study shows that the two formulations are equivalent so that they were therapeutically interchangeable for each other.

关键词： Metformin HCl diazepam HPLC sodium dodecyl sulphate (SDS) photo diode array (PDA) detector bioequivalence(BE) study.