Materials Literature
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[pt] O presente estudo apresenta o comportamento dos solos reforçados com PET em pó e triturado, através de ensaios de laboratório. Foram utilizados três solos: um solo coluvionar, uma areia limpa e mal graduada e uma bentonita. Caracterização física, química e ensaios mecânicos (triaxiais CIU e cisalhamento direto) f…
This was a collaborative effort between Lawrence Livermore National Security, LLC as manager and operator of Lawrence Livermore National Laboratory (LLNL) and Integrated Dynamic Electron Solutions, Inc. (IDES) to develop instrumentation, models and methodologies for imaging of materials using movie mode (MM) dynamic t…
I semiconduttori processabili da soluzione, organici e non, hanno suscitato negli ultimi decenni un notevole interesse scientifico. In particolare, i polimeri coniugati e i cristalli semiconduttori a dimensionalita’ ridotta (quantum dots) possono risultare cruciali nello sviluppo di dispositivi elettronici flessibili,…
采用原位水热合成法在氧化铝陶瓷膜（CM）表面原位合成出了孔道规则有序的MCM-41/CM分子筛膜。再采用浸渍法将SO4^2-/Zr O2负载在MCM-41/CM分子筛膜上对MCM-41进行酸改性,制得负载型固体酸催化剂SO4^2-/ZrO2/MCM-41/CM,并用于催化棕榈油与甲醇的酯交换反应制备生物柴油。结果表明,当Zr（NO3）4的浓度为0.4 mol/L、硫酸浓度为2 mol/L、焙烧温度为550℃时,制备出的负载型固体酸催化剂SO4^2-/Zr O2/MCM-41/CM活性最高。通过考察反应条件对酯交换反应的影响,得出最佳的反应条件,即当催化剂用量5%（以活性组分负载率计）、反应时间为60 min、反应温度为100℃、醇…
以熔盐法自制Cr2AlC粉末为原料，加入质量分数为5%的Al和质量分数10%的Cu作为黏接剂，采用真空-热压烧结技术制备Cr2AlC陶瓷基复合材料，通过SEM、OLYMPUS和HVS-100等方法研究热压工艺、黏接剂、退火工艺对Cr2AlC基陶瓷复合材料组织和性能的影响。结果表明：在Cr2AlC里加入质量分数为5%的Al，在800 ℃保温2 min制备的Cr2AlC基陶瓷复合材料密度4.458 g/cm3，硬度718.3 HV, 电阻率0.042 Ω·m；在Cr2AlC里加入质量分数为10%的Cu，在900 ℃保温2 min制备的Cr2AlC基陶瓷复合材料的密度5.188 g/cm3，硬度1 131 HV，电阻率0.019 Ω·m…
The concept of grain boundary (GB) design is developed for enhancement of properties of ultrafine-grained (UFG) nanostructured metals and alloys by tailoring different GBs (low angle and high angle ones, special and random, equilibrium and non-equilibrium, and so on), using severe plastic deformation (SPD). By variati…
We present a new experimental system of monodisperse, soft, frictionless, fluorescent labeled elastic shells for the characterization of structure, universal scaling laws and force networks in 3D jammed matter. The elastic shells in a jammed packing are deformed in such a way that at each contact one of the shells buc…
We establish a quantitative analogy between polymer grafted nanoparticles (PGNPs) and patchy nanoparticles (NPs). Over much of the experimentally relevant parameter space, we show that PGNPs behave quantitatively like Janus NPs, with the patch size having a universal dependence on the number of grafts and the ratio of…
The influence of temperature and hydration on the long term stability of the buffer material was studied during two experimental studies - "Mock-Up-CZ" experiment and "Long-term stability of engineering barriers" project. The objectives of these studies is to identify mineralogical, chemical and geochemical changes an…
Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China(Dated: January 5, 2015)To explore underlying mechanism for the superconducting phase in recent discovered aromatichydrocarbons, we carry out the rst-principles calculations on benzene, the basic and the simplestunit of the series…
This study explores the perception of renewable energy and hydrogen energy by the public and off-grid energy users to determine where and how HyLink™ might be adopted. HyLink™ is a prototype technology that uses electricity to make hydrogen gas from water. To date, user motivations for installing hydrogen power in off…
Jute is a natural cellulosic fiber obtained from the bark of jute plant. This fiber is popular due to its bio-biodegradability and better breathability. Due to the need for environmental protection, the demand of natural biodegradable and eco-friendly fibers like jute is increasing day by day. Jute can be dyed with se…
Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China. Department of Physics, Tsinghua University, Beijing 100084, China. Department of Physics and Materials Research Institute,…
We present optical spectroscopy (photoluminescence and reflectance) studies of thin layers of the transition metal dichalcogenide WSe2, with thickness ranging from mono- to tetra-layer and in the bulk limit. The investigated spectra show the evolution of excitonic resonances as a function of layer thickness, due to ch…
The SMS group unites global players in plant and machinery construction for processing steel and NF metals. It consists of the two Business Areas SMS Siemag and SMS Meer as well as industrial participations. The family-owned company, now run by the fourth generation, stands out for its strong market position, corporat…
We investigate the strain-induced coupling between a nitrogen-vacancy impurity and a resonant vibrational mode of a diamond nanoresonator. We show that under near-resonant laser excitation of the electronic states of the impurity, this coupling can modify the state of the resonator and either cool the resonator close…
Kebutuhan komponen mekanik untuk memiliki 2 sifat yang secara alami berlawanan sangat banyak dijumpai, contohnya pada poros dan roda gigi. Bahan poros dan roda gigi yang banyak digunakan adalah kelas baja karbon menengah, salah satunya ASSAB 760. Namun sebelum komponen tersebut digunakan, permukaan baja tersebut harus…
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以纤维素为原料,离子液体为反应介质,首先制备了纤维素氯乙酸酯大分子引发剂,然后以甲基丙烯酸甲酯（MMA）为单体,纤维素氯乙酸酯/Cu Br/2,2-联吡啶为引发体系,进行了原子转移自由基聚合反应,合成了纤维素接枝甲基丙烯酸甲酯聚合物（cellulose-g-PMMA）。利用傅里叶变换红外光谱、X射线衍射、热重分析等对cellulose-g-PMMA的结构与性能进行了表征。纤维素的结晶度57.90%,cellulose-g-PMMA的结晶度降至38.39%。利用原子力显微镜观察到cellulose-g-PMMA在溶剂丙酮中的平均粒径在40-70 nm左右。利用透射电镜观察到该聚合物胶束呈圆球状分布,粒径在200 nm左右,具有内核-…
The problem of axially-symmetric electromagnetic wave diffraction by a perfectly conducting bi-conical surface, which one arm is a semi-infinite cone and the other is a semi-infinite truncated cone, is solved rigorously using the mode-matching method and analytical regularization technique. The bi-cone is excited by a…