Materials Literature
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采用自行研制的镁合金熔体超声处理装置对Mg-4Al-1Si合金熔体进行处理,研究超声处理功率、超声处理时间和超声处理温度对其凝固组织及相形貌的影响。结果表明：超声处理可以显著细化Mg-4Al-1Si合金的凝固组织,适当提高超声功率和处理温度以及适当延长处理时间均可增强细化效果。650℃Mg-4Al-1Si合金熔体经270W超声处理50s可以取得较好的细化效果,平均晶粒尺寸为107μm,为未经超声处理合金晶粒尺寸（383μm）的28%。另外,经超声处理的Mg-4Al-1Si合金中Mg2Si相由未经超声处理时的粗大汉字状转变为细小、弥散分布的颗粒状。
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The paper presents the results of histological evaluation of local tissue reaction after subcutaneous implantation of biopolymer matrix materials made of modified pectin and collagens of various types. No acute inflammation or rejection were produced. Loose fibrous capsule was formed around the implants. The capsule d…
Production of high quality single- or few-layered graphene by solid exfoliation of graphite in presence of ammonia borane
本研究以鐵鉻矽硼非晶合金粉末做為研究目標，應用鈍化方式在粉末表面形成鈍化膜增加其電阻，讓粉末保有良好的軟磁性質。並利用鎳鋅鐵氧體的高電阻特性，微量添加於鐵鉻矽硼非晶合金粉末，以降低非晶合金在高頻率時的鐵損。並研究添加不同黏結劑以及不同形成壓力對電磁特性之影響。 以X光繞射儀 (XRD) 及掃描式電子顯微鏡 (SEM) 鑑定試片之微觀結構。以振動樣品磁力儀 (VSM) 量測試片的飽和磁化強度 (Bm) 及矯頑磁力 (Hc)。並測量測試片在不同頻率及電流下之初導磁率以及品質因子的變化情況。 藉由硝酸鈍化液濃度0.5N鈍化時間為120分鐘在非晶合金粉末表面形成鈍化膜，有效使品質因子15.9提升至30.5，但也因此始初始導磁率由8下降至4…
Figure 4. Experimental and theoretical charge state distributions of Ar at the photon energy of 5 keV. Abstract We have investigated multiphoton multiple ionization of argon and xenon atoms at 5 keV using a new x-ray free electron laser (XFEL) facility, the SPring-8 Angstrom Compact free electron LAser (SACLA) in Japa…
采用射频磁控溅射技术在室温下玻璃衬底上制备了铟镓锌氧（In—Ga—Zn-O）透明导电薄膜，并对该薄膜进行了真空退火。研究了不同退火温度对In-Ga—Zn-O薄膜结构、电学和光学性能的影响。X射线衍射（XRD）表明，在300℃至500℃退火温度范围内，In-Ga-Zn-O薄膜为非晶结构。随着退火温度的增加，薄膜的电阻率先减小后增大。透射光谱显示退火后In-Ga-Zn-O薄膜在500—800nm可见光区平均透过率超过80％，且在350nm附近表现出较强的紫外吸收特性。经过退火的薄膜光学禁带宽度随着退火温度的增加先增大后减小，350℃最大达到3．91eV。
研究了甲基橫酸盐体系电镀Pb-Sn-Cu三元合金工艺参数对镀层成分和外观的影响，确定了最佳的工艺条件：Pb^2＋95-105 g/L, Sn^2＋9-13g/L, Cu^2＋2-3g/L,曱基磺酸 140g/L,添加剂A3-5g/L,添加剂B 6-7 g/L,电流密度2.5 A/dm^2,温度19-23 ℃。在此工艺下以不锈钢片为基材镀Pb-Sn-Cu合金45 min，所得後层色泽均匀，结晶细致，膜层厚度为11.2μm，镀层中Sn含量为7.44%-7.52%，Cu含量为2.19%-2.26%，符合Pb-Sn-Cu三元合金镀层成分的要求。
研究了不同Al含量对Cu-Zr-Ti基块体非晶合金力学性能的影响。X射线衍射（XRD）图谱显示,制备态试样均为完全非晶结构。室温压缩试验及显微硬度测试表明,当Al含量（摩尔分数）达到6%时,试样的抗压强度为2002MPa,断裂应变量为6.48%,显微硬度（HV）为767.6。用扫描电镜（SEM）对（Cu60Zr33Ti7）94Al6试样的压缩断面进行观察,发现由于断面上存在大量均匀细小韧窝抑制剪切带的快速扩展,导致合金力学性能的提高。
在H13模具钢表面电刷镀Ni后900℃×4h粉末渗铝得到Ni—Al-Fe复合渗层，并对渗层组织与性能进行了研究。结果表明，H13钢表面电刷镀Ni后粉末渗铝能获得表面均匀致密的Ni-Al-Fe复合渗层，渗层含NiAl（Fe）和Ni2Al3（Fe）相，且具有高硬度和高耐磨性，最高硬度可达760HV0．2，磨损机理为粘着磨损。
在金属间化合物的结构演变中，原子尺寸因素起着重要的作用．由于密堆积效应，不同原子半径比的元素往往形成不同的结构．而自由电子填充于原子构成的晶体结构的间隙中，它对化合物的结构也有影响．基于组合结构化合物Ho2Ni7-xFex ，结合原子尺寸与自由电子对晶体结构的不同影响，文章探讨一种单位体积内自由电子浓度的经验方法来判断Ho2Ni7-xFex 化合物中两种异构体问的转变．随着Fe含量的增加，Ho2Ni7-xFex 化合物先结晶成Gd2C07型三方结构，然后结晶成Ce2Ni7型六方结构．利用Rietveld精修技术和磁测量，获得了化合物的晶体结构参数和饱和磁化强度．化合物晶胞常数随Fe含量增加而增加，饱和磁化强度则随之减少（dMs／d…
Spallation experiments have been conducted on a typical Zr-based bulk metallic glass(BMG) using a single-stage light gas gun.With a multi-stress pulse technique and specially designed double flyers, samples are subjected to dynamic tensile loadings of identical amplitude(～3.2 GPa) but with differ...
Montmorillonite was tested as an adsorbent for methylene blue (MB) removal from aqueous solution. The effect of various experimental parameters was investigated using a batch of adsorption techniques. In this manner, pH, amount of adsorbent, MB initial concentration, temperature which may affect MB adsorption on Montm…
以原位化学氧化法在Fe2O4粒子表面负载了聚苯胺（PANI），制得了磁性微球PF（PANI／Fe3O4），并以PF为载体用低温水热法（170℃）在其表面负载了TiO4，最终得到喜／壳／核结构的复合光催化剂11PF[（nTiO2：nPANI：nFe3O4）=77：6：1]．用X射线衍射仪（XRD）、透射电子显微镜（TEM）、傅里叶红外分光光度计（fTr—IR）、振动样品磁强计（VSM）对样品物相组成、形貌、表面性质、磁学性质进行了表征和分析．以25mg·L-1的苯酚为模拟污染物考察其催化活性，以自制的磁回收装置考察磁回收率．结果表明，TiO，粒径在5—8nm之间，具有锐钛矿和金红石混晶结构；PANI负载在磁核Fe3O4表面可降低磁粒…
The structural, electronic and magnetic properties of the hexagonal nanolaminated layered MAX phases compound Cr2GeC are investigated using the full-potential linearized augmented-plane-waves (FPLAPW) method within the generalized gradient approximation (GGA) and GGA+U calculations. The results indicate Cr2GeC has a s…
Oxidative coupling of methane (OCM) has been studied over a mixed catalyst constituted by Na2WO4-Mn/SiO2 (W) and BaCl2-TiO2-SnO2 (B). The effects of reaction temperature, gas hourly space velocity (GHSV) and CH4/O2 ratio on catalytic performance were systematic investigated. Compared with the single component counterp…
In this study we have found the relation of pH, temperature and concentration of CdCl2 and thiourea on the film thickness. The thickness of CdS required for device grade solar cell is in the range of 50–60 nm. The thickness is dependent on the deposition time, deposition temperature, concentration of the cadmium and s…
Precipitation of titanium dioxide layers from the gas phase in the reaction system containing titanium tetraisopropylate and oxygen at the total pressure 1 kPa is studied. It is shown that in the range of 300- 500°C the precipitation proceeds in the kinetic regime and is accompanied by the formation of layers of monot…
Abstract：Most biological tissues are supple and elastic，while current electronic devices fabricated by semiconductors and metals are usually stiff and brittle. As a result，implanted electronic devices can irritate and damage surrounding tissues，causing immune reaction and scarring. In this work，we develop stretchable…
用熔融淬冷法制备了系列不同组分和Tm3＋/Yb3＋掺杂浓度的Ge-Ga-Se-CsI硫卤玻璃样品,测试了样品的拉曼光谱、折射率、吸收光谱、红外荧光光谱。研究了975nm激光泵浦下样品的1.23μm和1.8μm荧光特性。分析了Tm3＋/Yb3＋之间声子辅助的共振能量转移,结果表明两个离子间有效的能量转移途径为Yb3＋∶2F5/2→Tm3＋∶3 H5。计算得到常温下Tm3＋∶3 H5→3F4和Tm3＋∶3F4→3 H6跃迁的多声子弛豫速率分别为303s-1和0.30s-1。