Ferromagnetism and the Optical Properties of Mn-Doped CdSe with the Wurtzite Structure

The geometrical structure of CdSe was optimized by using the ultrasoft pseudopotential method of a total energy plane wave based on density functional theory. The band structure, density of states, and optical properties were calculated and discussed in detail. The Mn-doped CdSe is found to be a half-metallic ferromagnet with 100% carrier spin polarization at the Fermi level. At a Mn concentration of 12.5%, the calculated total energy of the spin-polarized state is 614 meV lower than that of the nonspin-polarized state. The net magnetic moment of 5 μ _B is found per supercell for 12.5% Mn-doped CdSe. The estimated Curie temperature of 748.6 K for Mn-doped CdSe is above room temperature. The ferromagnetic ground state in Mn-doped CdSe can be explained in terms of the p ? d hybridization mechanism. These results suggest that Mn-doped CdSe may present a promising dilute magnetic semiconductor, and may have potential applications in the field of spintronics.     

Phase Separation Derived Core/Shell Structured Cu11V6O26/V2O5 Microspheres: First Synthesis and Excellent Lithium‐Ion Anode Performance with Outstanding Capacity Self‐Restoration

Novel amorphous vanadium oxide coated copper vanadium oxide (Cu₁₁V₆O₂₆/V₂O₅) microspheres with 3D hierarchical architecture have been successfully prepared via a microwave‐assisted solution method and subsequent annealing induced phase separation process. Pure Cu₁₁V₆O₂₆ microspheres without V₂O₅ coating are also obtained by an H₂O₂ solution dissolving treatment. When evaluated as an anode material for lithium‐ion batteries (LIBs), the as‐synthesized hybrid exhibits large reversible capacity, excellent rate capability, and outstanding capacity self‐recovery. Under the condition of high current density of 1 A g^?1, the 3D hierarchical Cu₁₁V₆O₂₆/V₂O₅ hybrid maintains a reversible capacity of ≈1110 mA h g^?1. Combined electrochemical analysis and high‐resolution transmission electron microscopy observation during cycling reveals that the amorphous V₂O₅ coating plays an important role on enhancing the electrochemical performances and capacity self‐recovery, which provides an active amorphous protective layer and abundant grain interfaces for efficient inserting and extracting of Li‐ion. As a result, this new copper vanadium oxide hybrid is proposed as a promising anode material for LIBs.     

Gold immunochromatographic sensor for the rapid detection of twenty-six sulfonamides in foods

A gold immunochromatographic sensor (GICS) was developed for the rapid detection of 26 sulfonamides in honey samples.The sensor was based on a group-specific monoclonal antibody (mAb) that can recognize all 26 sulfonamides.Three haptens (hapten 1 with a thiazole ring,hapten 2 with a benzene ring,and hapten 3 with a straight carbon chain) were used for antigen preparation.With hybridoma technology,a group-specific mAb was screened with a 50％ maximal inhibitory concentration (IC50) against sulfathizole (STZ) and the other 25 analogues ranging from 0.08 to 90.18 ng/mL.Mono-dispersed gold nanoparticles were conjugated with the mAb to develop the lateral immunochromatographic strip.A labeled antibody concentration of 0.1 μg/mL and a coating antigen concentration of 0.2 μg/mL in the test line were chosen for strip preparation.Under optimized conditions,the visual limits of detection (vLOD) for the concentrations of STZ,sulfamethoxazole,sulfamethizole,sulfadiazine,sulfamerazine,sulfadimethoxine,sulfamonomethoxine,sulfameter,sulfamethoxypyridazine,and sulfachloropyridazine were 5,0.25,0.25,10,5,10,25,2.5,5,0.25,and 10 μg/kg,respectively.Scanner analysis in honey samples revealed good performance for detection of the 26 sulfonamides.Commercial honey samples were tested with the sensor and positive results were confirmed with high-performance liquid chromatography.The proposed strip sensor provides a convenient method for the rapid and reliable determination of sulfonamides pollutants in honey samples.     

Gold nanoparticle-based paper sensor for ultrasensitive and multiple detection of 32 (fluoro)quinolones by one monoclonal antibody

For rapid and simultaneous detection of (fluoro)quinolones, a broadly specific monoclonal antibody (mAb) that recognizes 32 (fluoro)quinolone antibiotics was prepared using a mixture of a norfloxacin derivative and a sarfloxacin derivative as the hapten. An immunochromatographic strip based on gold nanoparticles (AuNPs) was then assembled with goat anti-mouse antibody and antigen (sarfloxacin coupled to ovalbumin), used to form the C line and T line, respectively. This antigen competes with the (fluoro)quinolones in a sample incubated with mAbs labeled with AuNPs. The strip can detect 32 (fluoro)quinolones including oxolinic acid, nalidixic acid, miloxacin, pipemidic acid, piromidic acid, rosoxacin, cinoxacin, norfloxacin, pefloxacin, lomfloxacin, enofloxacin, fleroxacin, ciprofloxacin, enrofloxacin, dafloxacin, orbifloxacin, sparfloxacin, gemifloxacin, besifloxacin, balofloxacin, gatifloxacin, moxifloxacin, nadifloxacin, ofloxacin, marbofloxacin, flumequine, pazufloxacin, prulifloxacin, sarafloxacin, difloxacin, trovafloxacin, and tosufloxacin in milk within 10 min with the naked eye. The cut-off values of the strip range from 1 to 100 ng/mL and the limits of detection are 0.1–10 ng/mL. The strip does not cross-react with antibiotics including tetracycline, sulfamethazine, ampicillin, erythromycin, aflatoxin B1, or gentamicin. In short, this immunochromatographic strip is a very useful tool for the primary screening of (fluoro)quinolones in milk.

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交互式理念在包装设计中的应用分析

目的研究交互式理念在现代包装设计中的具体应用。方法以人体工程学、艺术设计学为研究基础,采用系统分析法、案例分析法等论证方法,阐述如何运用交互式理念来满足消费者对包装的情感需求。结论交互式理念在包装结构、视觉元素以及包装材料方面的应用,创新了现代包装设计,赋予了其独特的视觉形象和贴切的人文关怀。     

Mo离子注入对纯铜表面纳米层稳定性的影响

采用表面机械研磨处理(SMAT)对纯铜进行表面改性,通过金属蒸汽真空弧离子注入技术在纳米表层注入Mo离子。利用光学显微镜(OM)、X射线衍射分析仪(XRD)和扫描电镜(SEM)观察SMAT处理效果,表面存在纳米层和变形层,通过原子力显微镜(AFM)表征纳米层的晶粒尺寸。结果表明:晶粒尺寸得到了显著的抑制,表面纳米层的晶粒在退火后长大到163nm,而注入了Mo离子的只长大到72nm。此外,SMAT并离子注入后材料表面的硬度仅达到SMAT试样的3.5倍,是纯Cu基体硬度的7倍左右。Mo离子的分散和由SMAT及离子注入引入晶体缺陷的反应促使了这些优化现象的产生。     

航空发动机用聚酰亚胺树脂基复合材料衬套研究进展

综述了航空发动机用聚酰亚胺树脂基复合材料衬套的特性及其研究进展与应用现状,重点介绍了石墨填充复合材料衬套、纤维编织增强复合材料衬套及短切纤维增强复合材料衬套的制备技术、性能特点与应用发展,指出低成本、连续化生产、耐高温及长使用寿命是未来航空发动机聚酰亚胺树脂基复合材料衬套及其材料体系的主要发展方向。     

罗河铁矿井下爆破振动对地表环境影响的监测与预测

为了研究罗河铁矿井下爆破振动对地表建筑物的影响,根据该矿的地表环境、爆破参数和爆破振动安全允许标准,采用NUBOX-6016振动监测仪,TP3V-4.5三维速度传感器和BM View软件对地表振动速度和频率进行两次监测。第一次3个点布置在地表离爆点为600 m、650 m、700 m的地方;第二次2个点布置在地表措施井和村庄附近。通过径、切、垂向的监测数据计算出最大合速度为0.757 cm/s,振动频率在30 Hz左右,远小于爆破安全规程所允许范围,得出该矿的爆破振动对地表的建筑物没有破坏作用。根据萨道夫斯基经验公式,用一元回归分析计算出三维方向相应K、α值,得出了三个方向的爆破振动速度预测公式,利用该公式可对今后地表建筑物的安全性进行预测,且为条件类似矿山爆破安全生产提供指导。