儿童发铁的测定及其临床意义

对哈尔滨市省政府文中托儿所１７９例６月～３岁婴幼儿进行Ｈｂ和发Ｆｅ的测定，发现发Ｆｅ缺乏发生率在６月～１岁年龄组中明显高于２～３岁年龄组．从总体上讲营养性缺铁性贫血发生率低于国内统计水平。但值得注意的是２～３岁年龄组中发Ｆｅ不足２５×１０－６仍较高．因此定期测定婴幼儿Ｈｂ或发Ｆｅ的指标可为早期诊断Ｆｅ缺乏和预防缺Ｆｅ性贫血提供依据．     

四元交互体系Li~+,Mg~(2+)/SO_4~(2-),B_4O_7~(2-)—H_2O25℃溶解度和溶液物化性质的研究

研究了Li~+,Mg~2+/SO_4~(2-),B_4O_7~(2-)—H_2O四元交互体系25℃时的溶解度和溶液的密度及折光率.四种原始组份未发生脱水作用,体系中也没有复盐或固溶体形成.体系25℃溶解度等温线由五段组成,有四个结晶区,分别对应于四种原始组份,其中以MgB_4O_7·9H_2O的结晶区最大.溶解度等温线上有两个零变量点,其一为MgB_4O_7·9H_2O,MgSO_4·7H_2O,Li_2SO_4·H_2O三盐共饱点,另一为MgB_4O_7·9H_2O,Li_2B_4O_7·3H_2O,Li_2SO_4·H_2O三盐不相称共饱点.     

利用模式识别技术识别鱼肉的鲜度

利用模式识别技术与紫外分光不镀分析法结合，根据鱼肉中的肌苷酸和肌苷的含量对鱼肉鲜度进行了识别，采用人工神经网络法和逐步判别分析法两种模式识别技术，判别结果令人满意。     

人工神经网络用于裂解质谱研究漆器漆膜

本文用裂解质谱方法，得到漆器漆膜裂解谱数据，然后用变频长误差反向传播算法的人工神经网络模型处理，初步结果证明人工神经网络方法为解析古代漆膜的年代信息提供了一条有效的新途径。     

N,N,N′,N′-四炔丙基-4,4′-二氨基-二苯甲烷与4,4′-联苯二苄叠氮固化动力学研究

分别利用FTIR和DSC技术对由N,N,N,′N′-四炔丙基-4,4′-二氨基-二苯甲烷(TPDDM)与4,4′-联苯二苄叠氮(BAMBP)形成的一种新型三唑树脂的固化反应及其动力学进行了研究.TPDDM与BAMBP通过1,3-偶极环加成反应形成三唑五元环结构的聚合物,固化起始温度约为70℃,体系在较低温度下即可固化.反应体系的固化反应是一级反应,采用DSC法与FTIR法分别获得了表观聚合反应动力学参数,其结果具有一定的可比性.     

金属的溶剂萃取热力学研究 2:In~2(SO~4)~3+Na~2SO~4+D~2EHMTPA+n-C~8H~18+H~2O体系

在温度278.15-303.15K和离子强度=为0.1-2.0mol/kg范围内,在萃取体系In~2(SO~4)~3+Na~2SO~4+D~2EHMTPA+n-C~8H~18+H~2O体系中,本文测定了萃取平衡的In^3+的平衡浓度和水相pH值,其中Na~2SO~4为支持电解质.根据Pitzer电解质溶液理论,估算了平衡水相中的真实离子强度值,并用直线外推法和多项式拟合法确定了萃取过程的热力学平衡常数K^ ,进而计算了这个萃取过程的各个热力学量.     

SYNTHESIS OF POLY(METHYL METHACRYLATE)-graft-POLYSTYRENE BY ATOM TRANSFER RADICAL POLYMERIZATION

The radical copolymerization of methyl methacrylate and 2-hydroxyethyl methacrylate was carried out via atomtransfer radical polymerization (ATRP) initiated by ethyl 2-bromoisobutyrate and catalyzed by CuBr/2,2'-bipyridinecomplex. This polymerization proceeds in a living fashion with controlled molecular weight and low polydispersity. Theobtained copolymer was esterified with 2-bromoisobutylryl bromide yielding a macroinitiator, poly(methyl methacrylate-co-2-hydroxyethyl methacrylate-co-2-(2-bromoisobutyryloxy)ethyl methacrylate), and its structure was characterized by ~1H-NMR. This macroinitiator was used for ATRP of styrene to synthesize poly(methyl methacrylate)-graft-polystyrene. Themolecular weight of graft copolymer increased with the monomer conversion, and the polydispersity remained relatively low.The individual grafted polystyrene chains were cleaved from the macroinitiator backbone by hydrolysis and the hydrolyzed product was characterized by ~1H-NMR and GPC.     

第48届国际数学奥林匹克概况及试题赏析

第48届IMO于2007年7月19日-31日在越南首都河内举行，来自95个国家与地区的520名选手参加了本届IMO．经过两天的角逐，共产生金牌39枚，银牌83枚，铜牌131枚．中国代表队表现依旧突出，中国队6名队员中4名选手获得金牌，2名选手获得银牌，团体总分第二名，与第一名俄罗斯队仅相差3分．本届IMO金牌分数线29分，银牌分数线21分，铜牌分数线14分．     

Influence of Interface Charge on Electrical Properties of ZnO／Si Heterojunction

The capacitance-voltage and current-voltage properties of the samples before and after annealing are investigated at 300 K and 195K. It is found that the interface charge plays an important role for the heterojunction properties. After annealing, the samples exhibit typical junction properties. The heterojunction shows a built-in potential 0.62eV consistent with the theoretical result 0.67eV. However, the sample exhibits more complex behaviour before annealing. The experimental results can be explained by heterojunction theory when, introducing interface charge, which suggests that the annealing can reduce interface charge and can improve the junction properties of the samples.     

反相离子对液相色谱柱后衍生法测定大鼠小肠组织中多胺含量

采取反相离子对液相色谱柱后衍生法测定大鼠小肠组织中多胺（包括腐胺、亚精胺和精胺）的含量。取4只SD雄性大鼠小肠组织冻干样品用高氯酸低温匀浆离心后取上清液,经0.45μm滤膜过滤后用反相离子对液相色谱柱后衍生法测定多胺（包括腐胺、亚精胺和精胺）的含量。结果发现该种方法所测得的腐胺、亚精胺和精胺的相对标准偏差都小于10%,三种生物多胺的方法回收率在89.2%—96.4%之间。