两个回归函数相等的Bootstrap检验

两个回归参数相等性检验一直是统计界感兴趣的问题之一．在这篇文章中，四个检验统计量被用于度量两曲线的差异，在原假设下统计量的分布采用向量数据的重复抽样来逼近，并给出了—些模拟结果．     

硅中铜与电子辐照缺陷的相互作用

本文研究了FZ与CZ硅中铜与电子辐照缺陷的相互作用.实验表明,这种作用使扩铜并经电子辐照的n型FZ硅出现两个未经报道的新的深中心,E(0.043)和E(0.396).前者只存在于FZ硅而不存在于CZ硅.后者在扩铜并经电子辐照的n型FZ和CZ硅中都存在.电子辐照再加适当温度的热处理还可电激活硅中的铜,另外,铜的存在还使硅中双空位的退火温度显著地降低.种种实验表明,在硅中与铜有关的六个主要能级分别对应于六种不同结构的深中心,在这些深中心之中既包含铜又包含点缺陷.其中E(0.043)很可能是铜与间隙硅原子的络合物,而E(0.167)及H(0.411)则很可能是铜与空位的不同形态的络合物.     

HL—1装置碳化和采用抽气孔栏时的可见辐射观测

本文描述了HL-1装置器壁碳化和采用抽气孔栏时,氢及杂质通量的变化情况;利用多道可见辐射的时空分布测量,得到了MARFE放电,在产生MARFE时,辐射热也相应增强。     

A Novel and Efficient Catalytic System for Aerobic Oxidative Coupling of 2-Naphthol Derivatives

The paper reported a novel and efficient aerobic oxidative coupling reaction of 2-naphthol derivatives catalyzed by CuCu (Ⅰ or Ⅱ)N-alkylimidazole complexes in excellent yields. The crystal structure of CuCu(Ⅱ)N-methylimidazole complex to be determined by X-Ray.     

Decomposition of Transformer Oil Under Ultrasonic Irradiation During Degassing Process

In the degassing process of transformer oil with ultrasonic waves ,decompostition of the oil was observed.Light hydrocarbons,including methane,ethane,ethylene ,aceylene,propane etc,were found to be released continuously from the oil into headspace within a closed vial placed in an ultrasonic field ,The gases came from decomposition of hydrocarbon molecules under cavitation effect.     

Sequential Injection Photometric Determination of Molybdenum Using Organic Wetting Film Extraction

Wetting film extraction was combined with colorimetry to determine nanogram amounts of molybdenum(VI). The simple extraction procedure enhanced sensitivity and selectivity while maintaining a high sample throughput. Extraction and back extraction steps were exploited to exclude interference from the 31 metal species and 11 anions tested. In the first step, molybdenum(VI) was extracted into a toluene film as an ion paired complex. Molybdenum(VI) reacted with thiocyanate to form anionic molybdenum(V) and/or molybdenum(VI) thiocyanate complexes. The complexes were extracted into a toluene film containing tetraheptylammonium bromide as ion pairing reagent. The thiocyanate ligands were displaced by 1,5-diphenylcarbazone (DPC) to form a more intensely colored complex (λ_max= 540 nm). DPC was introduced in the back extraction solvent, methanol. The relative standard deviation was 2.5% for 50 ng ml⁻¹of molybdenum(VI) (n= 10) at a rate of 25 samples h⁻¹. The detection limit (3 × baseline noise) was 2.5 × 10⁻⁸M.     

6-氨基青霉烷酸在弱碱性阴离子树脂IRA67上的吸附研究

用静态法研究了6-氨基青霉烷酸在弱碱性阴离子交换树脂IRA67上的吸附行为．在溶液pH为8．0，6-APA起始浓度介子3.00mg／m1-20．00mg／ml条件下，测定了25℃时IRA67树脂的静态交换动力学曲线、吸附等温线，并求得了IRA67树脂的平衡速率常数及吸附等温线方程．分别用Langmuir型和Frendlich型方程对IRA67树脂吸附等温线进行线性回归拟合，结果表明，6-APA在IRA67树脂上的吸附更符合Langmuir型吸附．     

乙炔和甲基二氯硅烷的硅氢加成反应研究Ⅳ催化剂的改性及其表征

对ＰｔＯ２／Ａｌ２Ｏ３催化剂进行了氟化处理及添加稀土金属氧化物的改性研究，考察了它们对乙炔和甲基二氯硅烷的硅氢加成反应的催化活性影响．并以ＩＲ、ＸＲＤ、ＴＰＲ及比表面积测定的方法，对氟改性前后的催化剂及载体进行了表征．结果表明，载体氟改性后较好地提高了催化剂的催化反应活性，其原因在于改变了载体的表面结构，增强了载体上的正电中心强度，从而增加了强中心上铂离子的比率，但没有改变其骨架结构，也没有形成新的晶相结构．     

Solar Radiation Is Shown to Select for Pigmented Bacteria in the Ambient Outdoor Atmosphere

Abstract— The percentage of pigmented to total bacteria in the outdoor atmospheric population was studied in the field and in controlled laboratory experiments to evaluate the effects of solar radiation (SR) on bacterial survival. The field experiments showed that the percentage of pigmented bacteria positively correlated with SR activity during clear summer days. The percentage was lowest during darkness before dawn and around midnight ( ca 33%) and as the SR increased during the day, gradually increased to a maximum of ca 50–60% at noontime to early afternoon and decreased thereafter. In the laboratory the ambient outdoor atmospheric bacteria impacted on culture plates were exposed to simulated SR and a germicidal light. With increased exposure, more nonpig-mented bacteria were killed and the percentage of pigmented bacteria gradually increased. These observations suggest an inverse relationship between the atmospheric bacterial survival and the percentage of pigmented bacteria contained therein, thus supporting the notion that pigmentation might provide protection for outdoor atmospheric bacteria from sunlight damage. As a consequence, viable pigmented bacteria (and other UV-resistant forms) in the atmosphere could be enriched under areas of stratospheric ozone depletion.     

Preparation and Characterization of Microencapsulated Hexadecane Used for Thermal Energy Storage

Polyurea microcapsules about 2.5μm in diameter containing phase change material for thermal energy storage application were synthesized and characterized by interfacial polycondensation method with toluene-2,4-diisocyanate and ethylenediamine as monomers in an emulsion system. Hexadecane was used as a phase change material and OP, which is nonionic surfactant, and used as an emulsifier. The chemical structure and thermal behavior of the microcapsules were investigated by FTIR and thermal analysis respectively. The results show encapsulated hexadecane has a good potential as a solar energy storage material.