铕、铽依诺沙星配合物的合成和光谱特性

合成了Eu3+、T b3+与依诺沙星配合物,并用元素分析法和ICP-AES法确定了配合物的组成为RE(enx)3C l3.8H2O。红外光谱表明,依诺沙星配体以羧酸根同中心离子发生螯合。紫外光谱表明,配合物的紫外吸收波长较配体稍有红移,且强度明显增强。荧光光谱表明,Eu3+配合物在592nm和612nm处出现Eu3+的特征荧光峰,分别对应5D0-7F1和5D0-7F2的能级跃迁。T b3+配合物在490nm和545nm出现T b3+的特征发射峰,且545nm处发射峰强度最大,二者分别对应5D4-7F6和5D4—7F5跃迁。     

反相微乳液法制备EDTA-Eu掺杂SiO2粒子及其荧光特性

采用反相微乳液法,制备了稀土配合物EDTA-Eu掺杂的SiO2荧光粒子.x射线衍射分析表明所得粒子为非晶态,红外光谱分析表明EDTA中的羰基以双齿配位的形式与Eu3+配位.荧光光谱分析表明,在396nm处没有出现Eu3+的本征激发峰,而在310nm处出现一较强激发峰,表明配合物的激发谱由配体EDTA吸收能量引起,并将能量传递给Eu3+使之发出特征荧光,在310nm光激发下,发射波长位于615nm处,对应于Eu3+离子电偶极跃迁5D0-7F2,发射光谱中没有出现磁偶极跃迁5D0-7F1表明Eu3+的配合物中稀土离子处于不对称中心,掺杂的ED-TA-Eu与SiO2摩尔比在1:120～1:15之间时,随着EDTA-Eu的掺杂量的增加siO2粒子的最大发射荧光强度成指数函数增长.     

铕掺杂配合物的合成及其荧光性质研究

采用稀土掺杂的方法以Zn2+与Eu3+、配体对氯苯甲酸(CBA)、邻菲罗啉(Phen)合成铕掺杂配合物铕-锌-对氯苯甲酸-邻菲罗啉(Eu-Zn-CBA-Phen).经元素分析,推测其组成为:Eu1-xZnx(CBA)3-xPhen*H2O(x=0～0.8).红外光谱分析证实,铕与配体发生配位,而紫外与荧光光谱分析表明,随着Zn2+取代配合物中部分Eu3+,配合物的荧光强度明显增加,当掺杂Zn2+与Eu3+摩尔分数比为2∶3时,荧光强度达到最大值.同时还系统地考察了非稀土金属离子的加入对配合物荧光性能的影响和荧光增强机理.     

Eu(Ⅲ)-PNVA-co-PSt纳米微球的光学性能研究

由无皂种子乳液聚合法合成了以疏水性聚苯乙烯(PSt)为核、亲水性聚N-乙烯基乙酰胺(PNVA)为壳的PNVA-co-PSt共聚物纳米级微球,进而将一定量的Eu3+与微球中的PNVA配位,得到了Eu(Ⅲ)-PNVA-co-PSt微球配合物.用透射电子显微镜(TEM)、Zeta-电位、红外光谱、紫外光谱以及荧光光谱分别对微球及其配合物的相关性质进行了表征.TEM观察发现,微球在与Eu3+配位前后保持规则的球形结构,有较好的单分散性;红外、紫外光谱测定表明,在Eu(Ⅲ)-PNVA-co-PSt微球配合物中Eu3+与PNVA链上的氧原子和氮原子发生配位作用;荧光光谱显示,Eu(Ⅲ)-PNVA-co-PSt配合物受到260nm波长的紫外光激发后,在584nm和612nm处产生增强的Eu3+的特征发射峰,说明在Eu3+与PNVA-co-PSt微球之间能够发生有效的F(o)rster能量传递,这为拓宽稀土的应用提供了新的途径.     

稀土铕,铽β-二酮配合物的合成与发光性能

采用Claisen缩合反应合成了一种新型的β-二酮化合物1-(4-溴苯)-3-苯基丙烷-1,3-二酮(L),并以其为第一配体,邻菲罗啉(phen)为第二配体,合成出新型稀土铕,铽二元及三元配合物。通过元素分析、红外光谱、紫外光谱、荧光光谱对合成的配体及配合物进行了表征。元素分析确定了配合物的组成。红外光谱的分析表明第一配体L中的氧原子以及第二配体phen中的氮原子与稀土离子进行了配位。紫外光谱表明第一配体L为能量的给体,第二配体phen起协同作用。通过荧光光谱研究了配合物的发光性质,结果显示三元配合物的发光强度大于二元配合物,三元配合物Eu(L)3phen表现出Eu3+的特征发射,在593,615,653,701 nm处的发射峰分别归属于Eu3+的5D0→7Fj(j=1,2,3,4)能级间的跃迁,并且以位于615 nm处的5D0→7F2电子跃迁所发出的荧光强度最大;而铽配合物中并没有出现Tb3+的特征发射。进一步的研究表明,这是由于配体L的最低三重态能级较适合Eu3+的发射能级,配体L吸收的能量可以有效的通过Antenna效应传递给稀土中心离子,使得三元配合物Eu(L)3phen的发光强度较大。     

掺杂卤代苯甲酸、含氮杂环铕配合物的合成、表征及荧光性能研究

分别以对溴苯甲酸和对碘苯甲酸为第一配体、含氮杂环(TPTZ和phen)为第二配体,以单一稀土Eu3+和Eu3+掺杂Gd3+、y3+为中心合成了12种配合物.对其进行了元素分析、紫外光谱、红外光谱、荧光激发和发射光谱的测定.推测化合物的组成分别为:(1)Eu(P- BrBA)3(TPTZ)·2H2 O; (2) Eu(P - IBA)3 (TPIZ)·2H2O;(3)Eu0.5Gd0.5 (P - BrBA)3 (TPTZ)·2H2O; (4) Eu0.5 Gd0.5(P- IBA)3(TPTZ)· 2H2O; (5) Eu0.5Y0.5(P - BrBA)3(TPTZ)· 2H2O;(6)Eu0.5Y0.5(P-IBA)3(TPTZ) · 2H2O;(7)Eu(P-BrBA)3(phen)· 2C2H5OH;(8)Eu(P- IBA)3(phen)· 2C2 H5 OH; (9) Eu0.5 Gd0.5(P- BrBA)3(phen)·2C2H5OH; (10) Eu0.5Gd0.5(P- IBA)3( phen).2C2H5OH;(11)Eu0.5Y0.5(P- BrBA)3(phen)·2C2H5OH和(12) Eu0.5Y0.5(P- IBA)3 (phen)·2C2H5 OH.卤代苯甲酸的羧基氧和稀土离子配位,TPTZ和phen的氮原子与稀土离子成键;配合物的形成对配体的共轭π-π*跃迁影响不大;几种不同的卤代苯甲酸铕配合物的发光强度有所差别,对溴苯甲酸配合物较强,中性配体TPTZ强于phen;掺钆、钇的铕配合物的荧光强度大于纯铕配合物,表明掺杂配合物并非简单配合物的混合,而是有一定混配配合物形成.     

系列Schiff配体及其Eu(Ⅲ),Tb(Ⅲ)配合物的合成、表征及荧光性质

为了研究Schiff类稀土配合物的组成和荧光性质,合成了N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯基甲烷(L1),N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯基甲烷(L2),N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯醚(L3)3种配体及其Eu(Ⅲ),Tb(Ⅲ)配合物。通过对配体和配合物的红外吸收、核磁共振、紫外吸收、元素分析、差热—热重、摩尔电导率及荧光光谱的测定分析了配合物的组成和性质。结果表明,配合物的组成为RE2(NO3)4.L4.2H2O(RE=Tb3+,Eu3+;L=L1,L2,L3),每个稀土离子与5个O、4个N配位,配位数为9,还有2个结晶水。室温下,Eu(Ⅲ),Tb(Ⅲ)配合物均有荧光发射,且Eu(Ⅲ)配合物发射出更强的Eu3+特征荧光,说明该类配体敏化Eu3+发光比Tb3+发光程度更大。     

两种新的铕配合物的合成、表征及其光、热、电性质

以邻苯二甲酸酐、二苯胺、4-氨基安替吡啉和三氧化二铕为原料合成了Eu(PPA)3Phen和Eu(APA)3Phen.使用核磁和质谱对配体和配合物进行了表征,研究了紫外、荧光光谱、磷光寿命、热稳定性和电化学性质.结果表明,配合物的紫外吸收分别表现出生成它们各自配体的紫外吸收特征,Eu(PPA)3Phen和Eu(APA)3Phen在613nm处有很强的荧光发射,归属于Eu3+的5D0→7F2的特征发射,此外,在590nm处都有荧光发射.测得两种配合物粉末的磷光寿命,它们相差较大,Eu(PPA)3Phen有三个磷光寿命都约为0.0.45μs,Eu(APA)3Phen有两个磷光寿命都为650μs.热重分析表明,Eu(PPA)3Phen在30℃～260℃分解大约10%,而Eu(APA)3Phen在70℃～240℃分解大约5%.使用循环伏安法研究了Eu(PPA)3Phen和Eu(APA)3Phen的电化学性质,结果表明两者都约在0.86V处有不可逆的氧化电位值.     

稀土2-噻吩甲酸系列配合物的合成及其Eu3+的发光

合成了6种稀土2-噻吩甲酸(L)配合物.通过元素分析、摩尔电导及差热-热重分析确定其化学组成为REL3·2H2O(RE= Y,La,Pr,Nd,Sm,Eu;L=C4H3SCOOH),测定了配体及配合物的红外光谱、紫外光谱及铕配合物荧光激发和发射光谱.红外光谱测定表明,配体通过羧基以鏊合双齿的方式与稀土离子(Ⅲ)配位成键.荧光光谱数据表明, 铕配合物具有良好的荧光性能.     

2-羟基-6-甲基尼古丁酸-1,10-菲咯啉三元稀土配合物的合成、表征及谱学性质

合成了四种新型的2-羟基-6-甲基尼古丁酸(HA)-1,10-菲咯啉(Phen)三元稀土配合物,通过元素分析、红外光谱法确定其组成为LnA3phen·3H2O(Ln=La、Eu、Gd、Tb),配体的羧基与稀土离子以螯合双齿配位。另重点研究了铕和铽的配合物的荧光性能,两种配合物均具有比较优异的荧光性能,Eu3+和Tb3+均不处于反演中心。EuA3phen·3H2O和TbA3phen·3H2O的荧光寿命分别为1.56 ms和0.32 ms。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.