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Neural Regeneration Research 2012年第16期7卷 1213-1219页

作者： Na Liu Zhouping Tang Zhiyuan Yu Minjie Xie Yu Zhang Erfang Yang Shabei Xu Department of Neurology Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 HubeiProvince China

This study aimed to examine the differences in the morphological properties and proliferation of olfactory ensheathing cells in three-dimensional culture on collagen-heparan sulfate biological scaffolds and in two-dimensional culture on common flat culture plates. The proliferation rate of olfactory ensheathing cells in three-dimensional culture was higher than that in two-dimensional culture, as detected by an M-I-r assay. In addition, more than half of the olfactory ensheathing cells subcultured using the trypsinization method in three-dimensional culture displayed a spindly Schwann cell-like morphology with extremely long processes, while they showed a flat astrocyte-like morphology in two-dimensional culture. Moreover, spindle-shaped olfactory ensheathing cells tended to adopt an elongated bipolar morphology under both culture conditions. Experimental findings indicate that the morphological properties and proliferation of olfactory ensheathing cells in three-dimensional culture on collagen-heparan sulfate biological scaffolds are better than those in two-dimensional culture.

关键词： morphological properties cell proliferation biological scaffold olfactory ensheathing cells three-dimensional culture neural regeneration

Mechanical and morphological properties of Highly Dispersed Carbon Nanotubes Reinforced Cement Based Materials

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Journal of Wuhan University of Technology(Materials Science) 2013年第1期28卷 82-87页

作者：王宝民 HAN Yu PAN Baofeng ZHANG Tingting Institute of Building Materials Dalian University of Technology Institute of Road Engineering Dalian University of Technology Department of Civil and Environmental Engineering Imperial College London

Stable homogeneous suspensions of multi-walled carbon nanotubes （MWCNTs） were prepared using gum arabic （GA） as dispersant and were incorporated to Portland cement paste. The dispersion was examined by ultraviolet visible spectroscopy （UV-vis）, and the concentration measurement shows that the optimum concentration of GA is 0.45 g · L^-1. The dispersibility of the surface-modified MWCNTs in aqueous solution and cement matrix were investigated by transmission electron microscopy （TEM） and energy dispersive spectroscopy （EDS）, and the mechanical properties of the composites were investigated. The results show that the addition of the treated nanotubes can improve both the flexural strength and the compressive strength of the Portland cement composite significantly. The flexural strength of the composite increases up to 43.38% with the MWCNT concentration of 0.08% （by weight of cement）. The porosity and pore size distribution of the composites were measured by mercury intrusion porosimetry （MIP）, and the results indicate that the cement paste doped with MWCNTs obtained lower porosity and concentrated pore size distribution. The morphological structure was analyzed by field emission scanning electron microscopy （FESEM） and EDS. It is shown that MWCNTs act as bridges and networks across cracks and voids, which transfer the load in case of tension, and the interface bond strength between the nanotubes and matrix is very strong.

关键词： carbon nanotubes Portland cement dispersibility reinforcement morphological properties

Effect of Stewing in Cooking Step on Textural and morphological properties of Cooked Rice

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Rice science 2009年第3期16卷 243-246页

作者： E.GHASEMI M.T.Hamed MOSAVIAN M.H.Haddad KHODAPARAST Chemical Engineering Department Ferdowsi University of Mashhad Food Science and Technology Department Ferdowsi University of Mashhad

Stewing of rice grains by steam after boiling in excess water can be used for cooking rice perfectly. The effects of this procedure in cooking of three varieties of Iranian rice （Sang Tarom, Domsiyah and Fair） on textural and morphological properties of cooked rice grains were investigated. The results showed that this step in rice cooking reduced the hardness and increased the adhesiveness of rice grains significantly. By the use of the scanning electron microscopy, it was shown that the outer surface of cooked rice stewed by steam had less porosity and closer pores due to the modification during cooking, and better gelatinization and more expansion of starch granules compared to non-stewed samples. The use of this procedure in rice cooking to provide a fully cooked and gelatinized, softer and stickier final product is recommended.

关键词： rice cooking stewing gelatinization texture morphological properties

Characterization of road surfacing aggregates based on their mineralogical fingerprint

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第5期9卷 880-891页

作者： Dawei Wang Yulin He Chonghui Wang Zeyu Zhang Guoyang Lu Pengfei Liu Markus Oeser School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China Institute of Highway Engineering RWTH Aachen UniversityAachen 52074Germany Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina

To ensure the safety of infrastructure users,the long-term skid resistance is a crucial factor and is determined in large by the mineralogical and morphological characteristics of surfacing aggregate.Most studies have investigated these aggregate properties separately without considering the interrelation between one another.The objective of this study is to consider the morphological characteristics as well as the mineralogical fingerprint of aggregate to develop an innovative approach to optimize the aggregate selection process.The investigations are based on 11 different aggregate types with a broad range of mineralogy,commonly used in Germany.The long-term influence of polishing and wearing on the surface aggregate was simulated by means of the Aachen Polishing Machine and the MicroDeval test respectively.To evaluate the impact of these tests,the aggregate shape was characterized by means of an imaging system called Aggregate Image Measurement System while the skid resistance of aggregates was evaluated with the British Pendulum Test.The test results show that the quartz and calcite are the key crystals to determine the anti-wear resistance of aggregates.A correlation between the skid resistance,morphological properties and mineralogy is derived,which proves the mineralogical fingerprint technology is practical for characterization of aggregates used in pavement surface layers.

关键词： Skid resistance morphological properties Mineralogical fingerprint identification Road surface Accelerating polish

Design and criteria of electrospun fibrous scaffolds for the treatment of spinal cord injury

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Neural Regeneration Research 2017年第11期12卷 1786-1790页

作者： Barbara Vigani Silvia Rossi Giuseppina Sandri Maria Cristina Bonferoni Franca Ferrari Department of Drug Sciences University of PaviaViale TaramelliPaviaItaly

The complex pathophysiology of spinal cord injury may explain the current lack of an effective therapeutic approach for the regeneration of damaged neuronal cells and the recovery of motor functions. Many efforts have been performed to design and develop suitable scaffolds for spinal cord regeneration, keeping in mind that the reconstruction of a pro-regenerative environment is the key challenge for an effective neurogenesis. The aim of this review is to outline the main features of an ideal scaffold, based on biomaterials, produced by the electrospinning technique and intended for the spinal cord regeneration. An overview of the poly- mers more investigated in the production of neural fibrous scaffolds is also provided.

关键词： spinal cord injury biomaterials electrospun fibers conductive scaffolds morphological properties biodegradability

INVESTIGATION INTO MORPHOLOGY, MICROSTRUCTURE AND properties OF SBR/EPDM/ORGANO MONTMORILLONITE NANOCOMPOSITES

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Chinese Journal of Polymer Science 2013年第4期31卷 660-669页

作者： Massud Durandish Abdolmajid Alipour Zarghan Branch Islamic Azad UniversityZarghanIran Young Researchers Club Zarghan BranchIslamic Azad UniversityZarghanIran

Rubber compounds based on styrene-butadiene rubber/ethylene propylene diene monomer blends of different compositions （60/40, 70/30, 80/20, 90/10, 100/0） reinforced with 1 wt%, 3 wt%, 5 wt% and 7 wt% organoclay （Cloisite 20A） were prepared on a two roll mill via a vulcanization process and characterized by several techniques. Results of X-ray diffraction showed expansion of the inter-gallery distance, and transmission electron microscopy （TEM） micrographs confirmed that the prepared nanocomposite samples have intercalated and partially exfoliated structures. Cure characteristics showed that, organoclay not only accelerates the vulcanization reaction, but also gives rise to a marked increase of the torque, indicating crosslink density of the prepared compounds increases at the presence of organoclay. Mechanical properties of samples received markedly increase by clay loading due to the good interaction established between nanoclay particles and polymer matrix as it was evidenced by SEM photomicrographs. At the same time, rheological properties showed that addition of nanoclay could improve storage modulus as well as complex viscosity of SBR/EPDM samples. The results of ozone test revealed that the ozone resistance of samples significantly increases as nanoclay or EPDM content increases.

关键词： Nanoclay SBR/EPDM nanocomposite morphological properties Mechanical and rheological measurements TEM and SEM Photomicrographs.

Influence of acid and alkaline sources on optical, structural and photovoltaic properties of CdSe nanoparticles precipitated from aqueous solution

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Frontiers of Materials Science 2016年第2期10卷 168-177页

作者： C. Selene CORIA-MONROY Merida SOTELO-LERMA Hailin HU Instituto de Energias Renovables Universidad Nacional Autonoma de Mexico (UNAM) Priv. Xochicalco S/N 62580 Temixco Morelos Mexico Universidad de Sonora Blvd. Luis Encinas y Rosales S/N Col. Centro Hermosillo Sonora Mexico

CdSe is a widely researched material for photovoltaic applications. One of the most important parameters of the synthesis is the pH value, since it determines the kinetics and the mechanism of the reaction and in consequence, the optical and morphological properties of the products. We present the synthesis of CdSe in solution with strict control of pH and the comparison of ammonia and KOH as alkaline sources and diluted HCI as acid medium. CdSe formation was monitored with photoluminescence emission spectra （main peak in 490 nm, bandgap of CdSe nanoparticles）. XRD patterns indicated that CdSe nanoparticles are mainly of cubic structure for ammonia and HCI, but the hexagonal planes appear with KOH. Product yield decreases with pH and also decreases with KOH at constant pH value since ammonia has a double function, as complexing agent and alkaline source. Changes in morphology were observed in SEM images as well with the different alkaline source. The effect of alkaline sources on photovoltaic performance of hybrid organic solar cells with CdSe and poly（3-hexylthio- phene） as active layers was clearly observed, indicating the importance of synthesis conditions on optoelectronic properties of promising semiconductor nanomaterials for solar cell applications.

关键词： CdSe optical properties morphological properties hybrid solar cells

Preliminary Study on Tensile and Impact properties of Kenaf/Bamboo Fiber Reinforced Epoxy Composites

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Journal of Renewable Materials 2018年第5期6卷 529-535页

作者： Ahmad Safwan Mohammad Jawaid Mohamed T.H.Sultan Azman Hassan Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 UPM SerdangSelangor Darul EhsanMalaysia Department of Aerospace Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangor Darul EhsanMalaysia Department of Polymer Engineering Faculty of Chemical and PetroleumUniversiti Teknologi MalaysiaSkudaiJohor BharuMalaysia

The application of natural fibers as reinforcement in composite material has increased due to environmental concerns,low cost,degradability and health concerns.The purpose of this study is to identify the best type of bamboo fibers to be used as reinforcement for kenaf(K)/bamboo hybrid composite.There were three types of bamboo fibers evaluated in this study which include bamboo mat(B),bamboo fabric(BF)and bamboo powder(BP).Chemical composition of B,BF,BP and K fibers were analyzed in this study.The effect of different types of bamboo fibers on tensile,impact,and morphological properties were investigated.The B/epoxy composites displayed the highest tensile strength(53.03 MPa)while K/epoxy composite had the highest tensile modulus(4.71 GPa).Scanning electron micrographs of B/epoxy composites displayed better fiber/matrix interfacial bonding in comparison to other studied composites.Results showed that impact strength of BF-based composite was highest(45.70 J/m).In conclusion,the tensile strength of B/epoxy composite is superior to the other bamboo reinforced composites and will be further evaluated in the next study.

关键词： Composite kenaf bamboo natural fiber polymer composite tensile properties impact properties morphological properties

morphological Characterization of Agave tequilana Weber Variety azul(Asparagaceae)under Cultivation in the Municipality of Llera,Tamaulipas,Mexico

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Open Journal of Forestry 2020年第2期10卷 264-275页

作者： Alejandra Vázquez-Acosta Jacinto Trevino-Carreon Benigno Estrada-Drouaillet Martha Lucrecia Garcia-Alanis Maria Concepcion Herrera-Monsiváis Virginia Vargas Tristán Instituto Tecnologico de Ciudad Victoria Boulevard Emilio Portes Gilnumero 1301 pteVictoriaTamaulipasMéxico Facultad de Ingeniería y Ciencias-Universidad Autonoma de Tamaulipas Centro Universitario Adolfo Lopez MateosVictoriaTamaulipasMéxico

The blue agave (Agave tequilana Weber variety azul) is a species that is widely used to produce tequila. For this reason, in the last decade, large extensions of terrain have been established for its cultivation. However, much of this land has been abandoned in a short time because at the beginning it was not known that at least six years were needed before the agave could be harvested. However, when the growers wanted to reintegrate some of these crops into the productive process, their exact age and the cultural activities needed for harvesting the agave were unknown because information regarding its vegetative development relative to its age was lacking. The hypothesis of this work was: If the morphological properties reflect the development state of the population individuals, then the properties height, basal area, rosette diameter, the north, south, east and west leaf, leaves number and foliar verticil will help to characterize the age categories in Agave tequilana Weber variety azul population under cultivated conditions. To this end, six plots with plants of different ages (one to six years) were selected in the municipality of Llera, Tamaulipas, Mexico. In each plot, 60 individuals were selected at random, and their morphological properties (height, basal area, rosette diameter, northern leaf, southern leaf, eastern leaf, western leaf;number of leaves and leaf whorl) were measured. With these data, a principal component analysis was performed to determine which of these properties explains the most variation of the data. The results indicate that height and basal area are the properties that are most closely associated with plant age. It is also for the first time demonstrated that harvest time can be reduced by one or two years, which favors producers economically because it could generate savings in production costs.

关键词： morphological properties Vegetative Development Principal Components Blue Agave

A New Variety of Epichloё sylvatica in Native Brachypodium sylvaticum Beauv.Grown in Mt.Huangshan

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A New Variety of Epichloё sylvatica in Native Brachypodium ...