Materials Literature
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By means of in situ emulsion copolymerization,core-shell silica hybrid particles with poly(MMA-co-BA) shells were fabricated,which were subsequently compounded with isotactic polypropylene(PP) in the molten state to prepare SiO2/PP composites.The non-isothermal crystallization kinetics of SiO2/PP composites was invest…
The BN-based composite ceramics were fabricated with BN, SiO2 and AlN as raw materials by an hot-press sintering process. The effect of AlN content on the phase constitution, microstructure and mechanical properties of the composites was investigated. The results show that SiAlON can appear in the composites sintered…
During the process of exploring new high-performance magnetostrictive materials,Fe-Ga alloy was an important discovery with high stress sensitivity,good thermal-mechanical properties and magnetostrictive properties.It filled the blank between the traditional magnetostrictive materials and rare earth giant magnetostric…
Image segmentation of cotton is the key step of the cotton picker robot vision system. In the complex environment of the cotton fields of the strong light, shadow, etc. accurately and effectively splitting cotton, helps to determine its position in threedimensional space. In accordance with the characteristics of cott…
Flame retardant polyvinyl alcohol(PVA) grafted with acrylonitrile(AN)(FR-PVA-g-AN) was prepared via grafting copolymerization of AN onto PVA(PVA-g-AN) using K2S2O8-NaHSO3 as initiator followed by the chemical modification reaction with phosphoric acid and urea.The structure of FR-PVA-g-AN was characterized by Fourier…
The ESR and ESR-CDS casting microstructure of the M2 high speed steel was studied.The results show that the casting' edge is dendrite and appears three times dendrite with ESR,and the structure of heart are coarse equiaxed grains,between which is network carbide,and the segregation of ingot is more serious,the matrix…
To simulate the hydrophobic microstructure of cicada wing surface,a high speed precise micromilling machine was used to fabricate columnar microstructure arrays on aluminum alloy substrate.Microstructure,hydrophobicity and surface roughness of bionic specimen were investigated,and the hydrophobic mechanism of bionic s…
A high performance Al-Al2O3 metal and oxide composite carbon-free sliding gate was prepared under carbon burial at 1 450 ℃ for 6 h via a transient plastic phase process using tabular alumina,fused white corundum,α-Al2O3 fine powder and a fine Al powder as raw materials and phenolic resin as binder.The composite sample…
Conjugated thiourea system has attracted considerable attention as potential molecular framework to \nconstruct molecular components for molecular electronics. To date, thiourea systems are surprisingly \nunexplored although the well-known rigid π-systems enhance the development of molecular wire \narchitecture to be…
The relatively low reactivity of indium tin oxide (ITO) thin film coated on glass with its good conductivity and transparency make it the widely used electrode in displays and electrochromic devices. However, the inactivity of the surface may cause serious problems for physically deposited electrochromic polymer films…
Plastics have beneficial features of light weight and high workability, but their large thermal expansion emerges as a shortcoming for which reduction is desired in highly advanced industries. The negative thermal expansion (NTE) of antiperovskite manganese nitrides is greater than −30 ppm/K in α (coefficient of linea…
Os processos eletroqumicos da eletropolimerizao andica dos compostos heterocclicos nos modos galvanosttico e potenciodinmico da voltagem constante (que se realizam para obter os revestimentos protetores de corroso) so descritos matematicamente. Os modelos matemticos correspondentes
To discuss an effect of stress ratio and loading mode on high cycle fatigue performances of extruded magnesium alloys, axial loading fatigue tests under three conditions of stress ratio, R, of 0, -1 and -1.5, and also rotating bending fatigue tests have been performed in laboratory air at room temperature using hourgl…
The continuing interest in development of new soft magnetic alloys is driven by industrial need to enhance the performance of electrical power generation/distribution devices and various energy conversion and sensor systems. In this work we report on development of Fe-Co-B-(P)-Cu melt-spun alloys with high magnetic fl…
通过比较生物指示与生物监测技术和仪器分析技术的分析过程及原理,结合北京市土壤中土壤脲酶与土壤重金属含量之间的相关关系的案例,及生物指示与生物监测技术在水生生态系统及大气污染研究中的应用状况,系统阐述了生物指示与生物监测技术研究的发展历程、研究前沿及发展方向。指出定量校正及不同学科与地区的科学团队的合作是生物指示与生物监测技术研究中需要克服的关键问题,并提出生物指示与生物监测技术研究的目标是整合不同学科的研究方向,为人类健康与环境安全的保护与预测提供技术支持。
Changes in microstructure of a Cu single crystal by severe plastic deformation along a crystallographically asymmetric direction were observed. Plate-like specimens with (15 12 5)[9 10 3] orientation cut from the single crystal were deformed by rolling and accumulative roll-bonding. When the logarithmic equivalent str…
難燃薬剤を注入し, 塗装した木材について, 2000時間までの促進耐候性試験, 48か月までの屋外暴露試験を行い, 暴露時間が防火性能に及ぼす影響について検討を行った。使用した薬剤は変性カルバミルポリリン酸アンモニウムを主成分とする難燃薬剤A, リン酸グアニジンを主成分とする難燃薬剤Bの2種類であった。使用した塗料は, すべて油性の, [1]含浸・半透明型塗料 (茶色系), [2]半造膜・半透明型 (茶色系), [3]造膜・隠蔽型(白色系), [4]造膜・透明型, [5]造膜・隠蔽型 (白色系) の5種類であり, このうち, [1]と[2]は下塗りから上塗りまで同じ塗料を2~3回塗り重ねるタイプ, [3]と[4]は専用のウッドシー…
福井県の海岸部，平野部，山間部の3地点にて，炭素鋼の暴露試験およびACMセンサを用いた腐食性因子の調査を実施した．平野部における炭素鋼の年間腐食速度は0.022 mm/y，月ごとの飛来海塩粒子量Sの年間平均値は8.2 mgNaCl/（m2d），ぬれ時間（TOW）は年間3900 hであった．本県の環境腐食性は，国内にて中程度であると考えられた．毎月の腐食速度は，11～1月に高く，2～7月に低くなる季節変動を示し，ACM（Fe-Ag）センサの海塩相当付着量Wsおよび日平均電気量Qdewとの間に相関関係が確認された．
We study the spin-dependent electron transport in an armchair graphene nanoribbon sample driven by both the charge and the spin biases within the tight-binding framework. By numerical calculations we give the spin-dependent currents for a fixed spin bias as a function of the charge bias. It is found that we can let on…
CaCu3Ti4O12 powders were synthesized by sonochemical-assisted process via a precursor solution of calcium nitrate trihydrate, titanium isopropoxide and copper nitrate trihydrate. The reaction process was conducted with the assistance of intense sonication using Sonics Model VCX 750 until the completely precipitated pr…