氢氧化锰共沉淀分离-催化极谱法测定土壤中有效钼

土壤样品中有效钼用草酸铵-草酸混合溶液(pH 3.3)振摇提取,所得悬浮液用干滤纸过滤,分取部分滤液蒸缩体积后加入10 g.L-1酸性高锰酸钾溶液并蒸发至近干,趁热加0.25 mol.L-1氢氧化钠溶液进行共沉淀分离。分取部分上清液,用硫酸(1+1)溶液酸化后加入混合底液(其中含有二苯基乙醇酸、二苯胍及氯酸钠)及少许钛铁试剂溶液作为与钼(Ⅵ)进行催化反应的试剂体系。用JP-303极谱仪进行测定。在-220 mV峰电位处测得的峰电流值与其相应的钼(Ⅵ)的质量浓度在0.8～20μg.L-1范围内呈线性关系。此方法的检出限(3s/k)为0.002 6μg.g-1。用此方法分析了5个土壤标准物质,所测得有效钼的含量与其认定值相符。     

C40X2（X=H,F,Cl,Br）的理论研究

应用密度泛函理论在B3LYP/6-31G*水平上对C40X2(X=H,F,Cl,Br)进行研究.研究结果表明,C40X2(X=H,F,Cl,Br)在热力学上是稳定的,卤化衍生物的稳定性随卤素原子序数的增大而降低,最有利的衍生化方式是1-4加成,1-2与1-4加成的卤化和氢化衍生物在所研究的分子中较为稳定.这些研究有助于理解富勒烯衍生物的衍生化模式.     

Mechanical Properties of Ni-Coated Single Graphene Sheet and Their Embedded Aluminum Matrix Composites

The effects of Ni coating on the mechanical behaviors of single graphene sheet and their embedded Al matrix composites under axial tensionare investigated using molecular dynamics (MD) simulation method. Theresults show that the Young's moduli and tensile strength of grapheneobviously decrease after Ni coating. The results also show that the mechanical properties of Al matrix can be obviously increased by embedding asingle graphene sheet. From the simulation, we also find that the Young'smodulus and tensile strength of the Ni-coated graphene/Al composite isobviously larger than those of the uncoated graphene/Al composite. Theincreased magnitude of the Young's modulus and tensile strength ofgraphene/Al composite are 52.27 and 32.32 at 0.01 K, respectively,due to Ni coating. By exploring the effects of temperature on the mechanicalproperties of single graphene sheet and their embedded Al matrix composites, it is found that the higher temperature leads to the lower critical strain and tensile strength.     

Teleportation Capability of Six-Qubit Cluster State

Recently Wei-Bo Gao et al. [Phys. Rev. Lett. 104 (2010) 020501]; reported on the creation of a 4-photon 6-qubit cluster state. It is shown this states can be utilized for perfect teleportation of arbitrary three qubit systems and controlled teleportation of an arbitrary two-qubit state. Therefore, the six-qubit cluster state as quantum channels is equivalent to that of maximally six-qubit entangled state.     

α-腈基阿魏酸基体在MALDI-TOFMS测定中的应用研究

在基体辅助激光解吸电离飞行时间质谱（MALDI－TOFMS）测定中基体的作用举足轻重。有效或特效基体的发现和应用不仅可提高测试灵敏度和分辨率,加大分子量测定范围,还能扩增测试样品的种类,推动MALDI－TOFMS应用的发展。目前MALDI－TOFMS分析的常用基体^[1,2]测定多肽、蛋白质的α-腈基－4－羟基肉桂酸（4HCCA）和介子酸（SA）效果比较理想;而测定糖类物质的2,5－二羟基苯甲酸（DHB）则不能完全适用于在组成、结构、序列以及连接方式上存在多样性的碳水化合物的分子;测定DNA的3－羟基吡啶甲酸（3－HPA）使用时必须对样品、溶剂甚至基体本身进行严格纯化,较为烦琐,测定含百个碱基以上大分子量DNA的灵敏度和分辨率还不理想。本文考察研究α-腈基阿魏酸（CFA）旨在寻找MALDI－TOFMS测定的有效新基体,为MALDI－TOFMS测定提供更多的基体选择。     

The Study of Primary Cosmic Ray Mass Composition Around the

The lg N_e-N_μ relationship has been studied from 4.4×10⁴ events (total observation time is 2.9×10⁶s)collected from Mt. Liang Wang Array (24.5°N, 102.9°E, 2720m above sea level). In order to study the mass composition at the knee, Monte-Carlo simulations for the EAS development and detection under same event selection criteria as used in the experimental data have been performed. The result shows that the mass composition of primary cosmic rays has no obvious change and the dominant component is light nuclei around the knee.     

Estimation of the proton energy spectrum in knee region by analog read-out of ARGO-YBJ experiment

Based on the six months data set of ARGO-YBJ experiment with analog read-out and its Monte Carlo simulation,we study the difference between different primaries induced showers by using the space-time information of the charged particles in Extensive Air Showers.With five parameters which can efficiently pick out primary proton induced showers as inputs of an artificial neural network,the proton spectrum from 100 TeV to 10 PeV can be obtained.     

制备参数对高比表面积介孔催化剂La-Co-Zr-O结构与性能的影响

采用双表面活性剂模板(十六烷基三甲基溴化铵和聚乙二醇辛基苯基醚的混合物)分解法制备了不同原子比(n_La+n_Co)/(n_La+n_Co+n_Zr)和不同温度焙烧的系列介孔混合氧化物催化剂La-Co-Zr-O。运用XRD、N₂吸附/脱附、XPS和H₂-TPR等技术对催化剂进行了表征，并以CO和C₃H₈氧化为模型反应，考察了组分配比和焙烧温度等参数对催化剂催化性能的影响。比表面积和孔径测试结果表明，样品具有很高的比表面积(108～266 m²·g^-1)和分布集中的孔径(3.4～3.9 nm)，Zr含量较高的样品比表面积较大。XRD结果表明，样品中的活性组分钴物种主要以Co₃O₄形式存在；XPS和H₂-TPR结果表明，样品中可还原的晶格氧的数量、活动度以及表面钴原子浓度均与催化剂对CO和C₃H₈的氧化性能密切相关。原子比为0.5的样品中，较多的晶格氧易于在相对低温下还原；而原子比为0.7的样品表面钴原子浓度较高，这使得两样品均表现出较高的催化活性。经650 ℃焙烧的样品仍保持较高的比表面积(108 m²·g^-1)和分布集中的介孔孔径(最可几孔径约3.8 nm)，且催化活性下降幅度也很小，表明该系列介孔催化剂具有优良的抗烧结能力和介孔热稳定性。     

气相色谱-质谱联用法测定玩具中的致敏性芳香剂

采用气相色谱-质谱联仪(GC-MS),建立了一种能同时检测47种致敏性芳香剂的高通量分析方法。样品在密闭容器中,经乙酸乙酯溶剂超声萃取30 min后,进行离心分离、过滤,滤液采用GC-MS进行定性及定量分析。47种目标分析物的线性范围为5.0~100μg/mL,相关系数(r2)均大于0.999,方法定量限(LOQs)为0.3~20 mg/kg。此外,高、中、低3个浓度加标水平的实验结果表明,方法平均回收率为82.2%~107.9%,且相对标准偏差(RSD)为1.0%~9.9%。     

pH/温度双重敏感性微凝胶的合成与应用

智能微凝胶是一类具有独特物理、化学性质的聚合物网络和溶剂组成的体系, 在众多的领域具有潜在的应用.本文介绍了近年来pH和温度双重敏感性微凝胶的研究概况、制备方法及其在药物控制释放、分离纯化和光子晶体方面的应用.