短信竟然如此美丽

小a的妈妈昨晚给我打电话说孩子看不见黑板上的字，又不敢跟老师说。我一早就来到班里找小a了解情况。小a说：“我可以看见，我妈妈让我再往前坐一排。”听了这话，我对她说：“能看见的话就先在这里坐着，以后有合适的位置再给你调，好么？”小a，点点头。这时，他的妈妈来到了教室门外找我．又给我说起了调座位的事情。我把刚才了解到的情况向她说了一下。她急了，说：“小b比我们个子高，为什么在前面？”     

Large energy-loss straggling of swift heavy ions in ultra-thin active silicon layers

Monte Carlo simulations reveal considerable straggling of energy loss by the same ions with the same energy in fully-depleted silicon-on-insulator (FDSOI) devices with ultra-thin sensitive silicon layers down to 2.5 nm. The absolute straggling of deposited energy decreases with decreasing thickness of the active silicon layer. While the relative straggling increases gradually with decreasing thickness of silicon films and exhibits a sharp rise as the thickness of the silicon film descends below a threshold value of 50 nm, with the dispersion of deposited energy ascending above ±10%. Ion species and energy dependence of the energy-loss straggling are also investigated. For a given beam, the dispersion of deposited energy results in large uncertainty on the actual linear energy transfer (LET) of incident ions, and thus single event effect (SEE) responses, which pose great challenges for traditional error rate prediction methods.     

Preparation of Color-Changing Textile with pH Indicators Produced by Sol-Gel Method

Smart textile was developed in this paper,which could change color according to the p H value, meanwhile keep the flexibility,breathability,light weight and large cover of textiles. In this study p H sensitive fabrics were prepared by sol-gel method with two common p H indicators methyl red（ MR） and bromocresol green（ BCG）. The finished textiles present different halochromic behaviors with different dyeing methods. The oragic-inoragnic network,identified by Fourier transformed infrared spectrum（ FTIR） and solid state nuclear magnetic resonance（ NMR）,plays a key role in holding stability against leaking,and the cell viability keeps pace with the leaking process. The interaction between the gel matrix and indicators depends on the charges and size of guest molecules.     

4,4′-二(4,5-二氨基-1-偶氮萘)苯磺酰替苯胺的合成与表征

以4,4′?二氨基苯磺酰替苯胺(DASA)、1,8?二氨基萘为原料,通过重氮化、偶合反应合成了一种新型可降解绿色环保型偶氮染料—4,4′?二(4,5?二氨基?1?偶氮萘)苯磺酰替苯胺,产品结构经MS、1 H NMR和元素分析进行了表征.对反应条件进行了优化,当反应时间45 min、温度0～5℃及pH为6时,产率可达57...     

用高效液相色谱分析工业产品维生素E醋酸酯方法研究

维生素E对人体健康所起的作用,已逐渐为人们所认识。许多国家(包括我国在内),正在研究人工合成维生素E以及从天然物质中提取维生素E的方法,以满足社会对维生素E日益增长的需要。近几年来国外陆续发表了一些分析维生素E的方法,如分光光度法,气相色谱法,以及最近发展起来的液相色谱法。这些方法多是用于分析食品、药品以及动、植物体内多种维生素(包括维生素E)的含量,分析范围较窄,耗时     

双取代二茂铁为配体的配合物研究——Ⅲ.1,1''-双(二苯基膦)二茂铁氯化钯配合物的合成、表征、电化学性质和晶体结构

合成了以1,1′-双(二苯基膦)二茂铁(dppf)为双齿配体的双核配合物Pd(dppf)Cl₂,并通过红外、元素分析、热重分析.电子光谱对其进行了表征.该配合物及dppf的循环伏安研究结果给出两条可逆性较好的单电子氧化还原曲线.dppf形成配合物后,茂基氧化峰电位值显著增加.Pd(dppf)Cl₂的X-射线晶体结构表明,该配合物属单斜晶系,P2₁/n空间群.晶胞参数a=12.281(2)Å,b=16.497(2)Å,c=16.896(3)Å,β=93.6(2.6)°,Z=4,D_c=1.423g/cm³.与Pd(dppe)Cl₂的晶体结构进行了比较讨论,进一步研究了配体dppf和dppe的配位性能的差别.     

支链淀粉-三(苯基氨基甲酸酯)手性固定相的制备及对外消旋化合物的直接拆分

支链淀粉－三（苯基氨基甲酸酯）手性固定相的制备及对外消旋化合物的直接拆分１）周志强候经国陈立仁２）（中国科学院兰州化学物理研究所兰州７３００００）关键词高效液相色谱支链淀粉－三（苯基氨基甲酸酯）外消旋化合物手性拆分分类号Ｏ６５７．７在大量的手性固定相...