应用ABEEM模型计算金属钛菁化合物的电荷分布

应用密度泛函理论和电负性均衡原理,发展原子-键电负性均衡模型（ABEEM）,利用最小二乘法拟合和优化了价态电负性和硬度参数,并利用这些参数计算了一些金属钛菁配合物的电荷分布,计算结果可以和从头算结果相媲关．     

用NaNTU掩蔽Hg2+,Ag+和Cu2+的干扰--还原为金属锑试法鉴定锑

在用锡还原锑(Ⅲ)或锑(Ⅴ)试法鉴定锑时,Hg2 ,Ag 和Cu2 将产生干扰.实验发现,用N-烯丙基-N′-(对苯磺酸钠)硫脲可同时掩蔽Hg2 ,Ag 和Cu2 的干扰,与传统的利用沉淀分离消除干扰的方法相比,操作非常简便,掩蔽也很彻底.     

腐殖酸对钴、镉作用的研究

本文采用碱溶酸沉法提取土壤中的腐殖酸,研究对Co2+、Cd2+的吸附作用机理.结果表明:最佳pH范围为6～7,吸附过程属于放热过程.用该种腐殖酸样品吸附Co2+服从Langmuir和Freudlich吸附等温模型,19℃、35℃、45℃的饱和吸附量为12.51、9.52、8.30mg/g;吸附Cd2+在19℃、35℃时服从Langmuir和Freundlich吸附等温模型,饱和吸附量为33.90、33.43mg/g,但在45℃时主要服从Freundlich吸附等温模型.腐殖酸对Co2+、Cd2+的吸附是通过两级络合反应形成配合物的方式结合.     

Adsorption of Cu^2 ＋, Zn^2＋ and Cd^2＋ on Bacillus subtilis

A process of biosorption of Cu2 , Zn2 and Cd2 on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast. The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models: the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass. The results show that both the Ritchie second-order and modified second-order equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu2 and Zn2 on B. subtilis. The experimental data points of adsorption Cd2 and Zn2 on B. subtilis are described by Freundlich isotherms model.     

啤酒酵母对Zn~(2+)、Mn~(2+)和Cu~(2+)的吸附探究

文中利用啤酒酵母去除模拟废水中Zn2+、Mn2、Cu2+,通过对预处理试剂、吸附温度、吸附液pH值与浸泡时间等因素进行正交分析,确定了影响吸附的主要因素是酸度和预处理试剂.研究pH值、离子初始浓度、吸附时间、离子强度等条件对吸附率的影响,结果表明,用NaOH浸泡后2h,在pH=5~6时吸附效果最好.用吸附等温线Langmuir(exe)、Freundlich和Temkin方程拟合,相关性都比较好.用不同的吸附动力学方程描述啤酒酵母吸附金属离子的最优模型为Elovich方程.     

赭石的不同煎出液中Fe2+、Fe3+含量测定研究

目的:建立赭石的水煎液和醋煎液中Fe2+、Fe3+含量分别测定的方法。方法:在pH值为3~5之间,波长为396 nm,以邻二氮菲作显色剂,用紫外-可见分光光度计测定铁含量;在波长为510 nm处测定Fe2+的含量;再由2个浓度之差求得Fe3+的含量。结果:赭石的醋煎液和水煎液中铁含量有明显不同。结论:该方法精度好,回收率大于90%,操作简便,可用于Fe2+、Fe3+含量的测定。     

Mg2SiO4:Mn2+,Dy3+红色荧光粉制备及发光性能的研究

采用溶胶-凝胶法和微波辐射法制备了Mg2SiO4:Mn2+,Dy3+红色发光材料.研究了以Mg2SiO4为基质,在单掺杂Mn2+的情况下,微波合成时间和Mn2+的掺杂浓度对发光性能的影响.选择最佳微波合成时间和Mn2+掺杂浓度,研究了共掺Dy3+浓度对材料发光性能的影响.通过这两种方法制备了在410nm激发下,发光中心...     

Cr6+、Pb2+离子和Cr6+ +Pb2+对黄瓜幼苗的影响

采用Hoagland溶液实验,就不同浓度的铬、铅离子;铬＋铅离子对黄瓜幼苗生长和过氧化物酶活性的影响进行研究,结果表明随着重金属离子处理浓度的增加,黄瓜幼苗生长逐渐受到抑制,根系发生膜脂过氧化作用,丙二醛含量增加,抗氧化物酶活性升高;在重金属离子浓度低时酶的活性相对平缓,浓度高时变化较快。     

Preparation of Long Afterglow Photoluminescent Material SrAl_2O_4:Eu~(2+), Dy~(3+) and Its Luminescent Property

Thelongafterglowphotoluminescentmaterialshavebeenstudiedforalongtime.Thephotoluminescentmaterialscouldbeusedinmanyfields,forexample,asluminouspaintsinhighway,railway ,airport,ferry,andonthefacadeofbuildings.ZnS basedmaterialsdopedwithCuorMnwerefirstpreparedandappliedtovariousfields.However,theywerenotstableenoughformanyapplicationsandcouldonlymaintaintheirphosphores cenceforafewhours.Comparedwithsulfidephospho rescentphosphors,aluminates based phosphorsshowedexcellentphotoresistanceandchemic…     

CaAl2O4:Eu2+,Nd3+荧光粉燃烧合成工艺的研究

应用燃烧法在较低温度（600℃）下成功合成了CaAl2O4：Eu^2＋,Nd^3＋荧光粉，并研究了稀土离子Eu^2＋和Nd^3＋含量及点火温度对荧光粉发光性能的影响，确定了合成余辉亮度大、持续发光时间长的荧光粉时．稀土离子的最佳掺量和最佳合成温度。在此基础上研究了燃烧反应前驱体溶液中物质的结合情况。     

花江纳朵洞滴水 Ca2＋与 Mg2＋、 Sr2＋的时空变化

对贵州关岭县花江纳朵洞内4个滴水点（D4、D5、D7、D8）和1个池水点（DC）,及洞顶上方的泉点（NDS）和降水（NDR）的水文水化学特征进行1个水文年的观测,其结果表明：（1）纳朵洞内4个滴水点Ca2＋在2012年12月至2013年11月这段时期内,变化的趋势基本一致,在6月开始迅速上升,9月达到高峰,然后缓慢下降,其特点是夏秋高冬春低。（2）4个滴水点 Sr／Ca 主要与降水有关,表现出雨季低,旱季高的特点。     

Dioder-pumped self-Q-switched Cr4+, Nd3+: YAG laser with amplifier

This paper reports results of study on self-Q-switched Cr⁴⁺, Nd³⁺: YAG microchip lasers at 1.064 μm using a quasi-monolithic setup. Pulses with 6 to 60 ns wide (FWHM) and TEM00 mode produced under cw pumping with repetition rates ranging from 1.5 kHz to 23 kHz. Pulsed pumping yielded output pulses with repetition rates from 1Hz to several kHz and excellent pulse stability. A pulsed pumped microchip oscillator and flash lamp pumped amplifiers were used to set up a MOPA (Master Oscillator and Power Amplifier) system generating 225 kW pulses with 8 ns width. Project supported by BMBF, Germany; National Natural Science Foundation of China (NSFC, No. 69378019); the Key Foundation of Education Ministry of China.     

关于"x、y∈R+,x+y=1"的多种转化方法

对“x、y∈R^ ，x y=1”一类问题，总结出四种常用的转化方法，并介绍了它们在不等式及取值问题中的应用，其中，有的还适用于多元情况。     

铕、铽含氮杂环配合物的合成及荧光性能研究

合成了稀土(Eu3 、Tb3 )的含氮杂环配合物,配合物组成经元素分析、TG-DTG及IR得到确认。研究了配合物的荧光性能,结果表明:配合物荧光强度比相应离子的有明显的增强;稀土硝酸盐配合物的荧光性能优于稀土盐酸盐、稀土高氯酸盐所得配合物的;稀土邻菲啉配合物的荧光强度比稀土联吡啶配合物的有明显增强;在混合配合物中,铽对铕的发光有一定的敏化作用,而铕对铽的发光有明显的猝灭作用。     

互联网+时代下电气信息类专业应用型人才培养模式构建

“互联网+”技术思维模式融入传统产业所迸发的巨大生产力,不仅推动了产业的升级和转型,也加大了社会和市场对电气信息类人才的需求量,对传统的培养目标、教学模式也提出了新要求。本文通过分析“互联网+”时代下电气信息类专业应用型人才能力结构、“互联网+”时代下电气信息类专业应用型人才培养目标、“互联网+”人才培养模式,构建了以“能力为核心”的“三维”电气信息类专业应用型人才培养模式。     

Development of Long Live Love+, a school-based online sexual health programme for young adults. An intervention mapping approach

This paper describes the development of a Dutch online programme called Long Live Love+ focusing on positive, coercion-free relationships, contraception use, and the prevention of STIs, using the Intervention Mapping (IM) approach. All six steps of the approach were followed. Step 1 confirmed the need for a sexual health programme targeting young people aged 15 and over enrolled in higher level secondary education. Step 2 resulted in the production of a series of matrices-of-changes, including detailed programme objectives at the behavioural and the psycho-social level. Step 3 involved the selection of relevant methods and applications. Step 4 consisted of programme development, resulting in a sexual health programme with online and offline components, and including interactive exercises. Step 5 focused on adoption and implementation and included the production of a detailed teacher manual. Step 6 involved detailed planning for the process and effect evaluation and included interviews with teachers and focus group discussions with students to evaluate their experiences of the programme. The inclusion of a linkage group – and especially the inclusion of teachers in the development of the programme – turned out to be essential in terms of developing a programme in line with their context and needs.     

云南甘草总皂甙对氧自由基诱导羊心肌细胞膜Na~+,K~+-ATP酶活性降低的保护作用

云南甘草总皂甙对正常羊心肌细胞膜Na~+,K~+-ATP酶活性无影响;但对氧自由基诱导羊心肌细胞膜Na~+,K~+-ATP酶活性的降低有明显保护作用,随浓度增高,酶的活性逐渐升高,与对照组比较,总皂甙浓度为0.2mg·L~(-1)时,酶的活性恢复27.9％,浓度为0.8mg·L~(-1),酶的活性恢复46.6％。     

不定方程x~2+y~2+z~2=w~2的正整数解

本文完全解决了不定方程x~2+y~2+z~2=w~2的正整数解这一问题。     

丢番图方程X~2 y~2=z~2 w~2的通解

本文用初等方法给出了丢番图方程X~2 y~2=Z~2 w~2的正整数解的一个极优表达式。     

Selection of models in 2×2×2 contingency tables

This paper is the presentation of a simplified example of a technique, conceived by Yates and later developed by Goodman and Haberman, for the determination of appropriate log-models in the measurement of qualitative data in higher education.