碳纳米管与TritonX-100协同增敏Cu^2＋与DBH—PF显色反应的机理研究

研究了将碳纳米管（MWNTs）作为一种新型分析增效试剂与非离子表面活性剂-曲拉通X-100（TritonX-100）的协同增敏作用机理,并应用于Cu^2＋与二溴羟基苯基荧光酮（DBH—PF）的络合显色体系中。结果表明,在MWNTs与TritonX-100复配的影响下,在pH=6．0～7．0磷酸盐缓冲溶液中DBH—PF与Cu^2＋形成红色络合物,其最大吸收红移至570nm,吸收值提高了222．3％。Cu^2＋含量在1～100．04μg／mL范围内符合比耳定律,回归方程A=0．141C＋0.028（C,0.04μg／mL）,表观摩尔吸光系数￡=2．38×10^5L／（mol·cm）,R=0．9994。在最佳实验条件下,对中草药肉桂和黄连中的铜含量进行了测定,得到了满意的结果。     

The mechanism of CO oxidation over Cu(110): Effect of CO gas energy

The effect of the temperature of gas phase CO upon the kinetics of the oxygen titration reaction: CO_g +O_a CO_2,g, has been studied. It is found that the reaction's rate is independant of CO gas temperature between 300 and 623 K. The activation energy (6.5 kcal/mole), dependence upon CO pressure (first-order), and independence upon oxygen coverage for 0.1 _o 0.4 are all independant of the CO gas phase temperature. This result rules out any Eley-Rideal type mechanism whereby CO reacts directly from the gas phase with an oxygen adatom without first being accommodated to the surface temperature in an absorbed state. The result is instead interpretable in terms of a Langmuir-Hinshelwood mechanism.Camille and Henry Dreyfus Foundation Teacher-Scholar Fellowship.     

计算机系统能耗估量模型研究

为了解决计算机能耗估量问题,本文分析了计算机各部件的参数对能耗变化的贡献程度和参数之间的相关度,选取最能代表系统能耗变化的可监测参数建立了CMP模型,CMP模型可根据计算机系统处理任务时的状态不同而选取不同的能耗变化主导元件,利用这些元件的监测参数对计算机系统能耗进行估量。本文在各种任务状态下进行了实验,结果证明,CMP模型在计算机能耗估量中要优于常用的FAN模型和Cubic模型,尤其是在计算机做数据密集型任务的时候。     

杭州下沙土壤Pb、Zn、Cu的环境质量评价

对杭州下沙区土壤中酸碱度和铅、锌、铜进行监测分析,并使用单因子污染指数法与内梅罗综合污染指数法评价该区土壤环境质量状况。结果表明下沙区土壤偏碱性,重金属含量超过该区本底值,各区域土壤重金属含量关系从高到低依次为工业区、绿地、商业区、高教区。     

Adsorption behavior of cross-linked chitosan modified by graphene oxide for Cu（Ⅱ） removal

Cross-linked chitosan（CS）,cross-linked chitosan/graphene（CS/RGO10） and cross-linked chitosan/graphene oxide（CS/GO10） were prepared as adsorbents for Cu（Ⅱ）.The effects of pH,contact time,adsorbent dosage and initial concentration of Cu（Ⅱ） on the adsorbing abilities of CS,CS/RGO10 and CS/GO10 to Cu（Ⅱ） were investigated.The results demonstrate that the adsorption capacities of CS/GO10 and CS/RGO10 are greater than that of CS,especially at pH 5.0 and the adsorption capacities are 202.5,150 and 137.5 mg/g,respectively.Their behaviors obey the Freundlich isotherm model very well.Additionally,CS/GO10 has the shortest time to achieve adsorption equilibrium among them and can be used as a perspective adsorbent for Cu（Ⅱ）.     

Full color white light,temperature self-monitor,and thermochromatic effect of Cu+ and Tm3+ codoped germanate glasses

Lighting sources with full-color visible output are widely preferred in practical applications. In addition, modern lighting sources also tend to be intelligentized, and the intelligentization asks for smart luminescence materials. In this work, we attempt to develop novel full-color emitting material with temperature sensing and thermochromatic ability. To this end, the Cu²⁺ is successfully reduced to Cu⁺ which is incorporated into the germanate glasses. The glasses are prepared via a melt-quenching technique using graphite powders as reducing reagent. The supper-broadening of the excitation and the emission spectra of Cu⁺ in the germanate glasses are observed. Full-color emission is realized by introducing Tm³⁺ as co-dopant to provide the blue component in the spectra. The energy transfer behavior between Cu⁺ and Tm³⁺ is investigated, and it is found that these two luminescence centers are independently existent without energy transfer between them. The chromatic properties of the Cu⁺/Tm³⁺ co-doped glasses are tuned by Tm³⁺ concentration and excitation wavelength. The temperature sensing based on the fluorescence intensity ratio technique is demonstrated, and a constant sensitivity for the temperature detection is obtained. Moreover the thermochromatic property is also investigated, and it is found that the studied Cu⁺/Tm³⁺-doped glasses exhibit excellent thermochromatic performance.     

锶对消失模铸造B319铝合金铜相的影响

在消失模铸造慢冷条件下，B319铝合金组织中除存在α—Al枝晶及Si相外，还存在珊瑚状的A12Cu相及针状的β—Fe相，且Si相及针状β-Fe相可以作为Al2Cu的形核基底。Sr变质引起了离异共晶反应，使A12Cu相在缺乏Si相的区域析出，并促使Si在Cu相中溶解。研究还表明，采用0．03％Sr可以获得较好的变质效果，并使A1—Si共晶温度从575．9℃下降到566．4℃，从Cu相析出温度从520．4℃下降到512．5℃。     

Negative ion etching of Al−Si−Cu by employing a magnetic filter in halogen plasmas

Al etching was studied employing negative ions generated in downstream Cl₂ plasma. The Al etch rate by the alternate irradiation of positive and negative ions was two times higher than that by usual positive ions. In order to etch the Al film practically on an insulator covered electrode coupled with RF power, reduction of the negative self bias voltage (Vdc) was examined using a magnetic filter which traps electrons. The reason for the high etching reactivity is that the dominant negative ions F in SF₆ and Cl⁻ in Cl₂ plasmas are atomically very similar to the radicals. Addition of SF₆ and H₂ to a Cl₂/BCl₃ mixture reduced Vdc significantly. However, fluorine and hydrogen atoms inhibited Al etching in spite of sufficient ion energy.     

Al2O3/Cu复合材料的内氧化制备及性能研究

采用高能球磨制备出亚稳态的Cu-1%Al（质量分数）合金粉,再将Cu2O粉与其一起进行高能球磨,然后将复合粉末压坯在N2保护炉中同时进行氧化和烧结,制备出Al2O3/Cu复合材料。分析了分别采用湿法球磨和干法球磨时的合金化效果,讨论了模压压力对材料性能的影响。结果表明,对于Cu-Al混合粉来说,采用湿法球磨容易产生分层,采用干法球磨具有良好的合金化效果;在本试验条件下,750MPa为最佳的模压压力,但烧结后材料的电导率还是偏低,因此有必要进行后续的处理来进一步提高材料的性能。     

高温预析出对Al-Zn-Mg-Cu铝合金显微组织、强度和应力腐蚀抗力的影响

通过改变固溶条件 ,对Al Zn Mg Cu高强铝合金采用先高温后低温的两步固溶处理 (高温预析出 )来改善晶内和晶界的析出状态 ,研究了高温预析出对Al Zn Mg Cu铝合金的金相组织、强度和应力腐蚀性能的影响。结果表明 ,4 6 5℃高温预析出在保持较高强度和塑性的同时 ,可以改善合金的抗应力腐蚀性能