前驱体溶液pH值对溶胶凝胶制备钛酸铋薄膜的影响

采用溶胶凝胶技术在石英玻璃基片上制备钛酸铋薄膜,讨论了前驱体溶液的酸碱度（ｐＨ值）对薄膜结构和结晶性的影响．ｐＨ＜２和ｐＨ＞３５的前驱体溶液所制备的薄膜在晶化过程中出现Ｂｉ２Ｔｉ２Ｏ７和Ｂｉ２Ｔｉ４Ｏ１１杂相．ｐＨ＝２５～３５的前驱体溶液制备的薄膜是钙钛矿Ｂｉ４Ｔｉ３Ｏ１２结构的取向薄膜     

Hofmann重排法合成苯氨基甲酸酯

采用一种新型的溴化试剂１,３－二溴－５,５－二甲基海因（ＤＢＤＭＨ）,在醋酸汞存在下,使苯甲酰胺发生Ｈｏｆｍａｎｎ重排、经异氰酸酯中间体,与醇作用,合成了苯氨基甲酸酯。     

Bi4Ti3O12铁电薄膜溶胶—凝胶法制备过程中Bi—Ti溶胶的匀胶规律研究

介绍了Ｓｏｌｇｅｌ法制备Ｂｉ４Ｔｉ３Ｏ１２薄膜的工艺过程,研究了ＢｉＴｉ溶胶在Ｓｉ基片上的匀胶规律;用ＴＧＤＴＡ和ＴＥＭ技术研究了ＢｉＴｉ干凝胶的形态,并成功地在Ｐｔ／Ｔｉ／Ｓｉ基片上制备了ｃ轴取向的Ｂｉ４Ｔｉ３Ｏ１２薄膜．     

氯代吲哚丁酸乙酯的合成研究

以Ｆｅ粉为催化剂,用直接通入Ｃｌ２的方法对吲哚丁酸乙酯进行氯化,其氯代产物经确证为一未见文献报道的新化合物,对其合成方法进行了详细的讨论。     

Molecular evidence for increased hematopoietic proliferation in the spleen of the b/b laboratory rat

The splenomegaly and the appearance of a significant number of CFU-E (erythroid colony-forming units) and BFU-E¹ (erythroid burst-forming units) in the Belgrade laboratory rat (b/b) spleen prompted us to analyse further the molecular evidence for increased hematopoietic proliferation in the b/b spleen. Messenger RNAs (mRNAs) specific for globins, proteins for iron transport and deposition and the band 3 protein were used in rat erythropoietic tissues as markers for proliferation and erythroid differentiation. In the b/b spleen, all mRNAs analysed display an erythroid-specific pattern of expression. This analysis also revealed an enhanced level of mRNA for ferritin in the +/b spleen, whereas erythrocyte-specific mRNA production was normal.     

Cl−/HCO 3 − exchanger is operative in isolated enterocytes from rat jejunum

Enterocytes isolated from rat jejunum were tested for the existence of a Cl^–/HCO ₃ ^– exchange, previously evidenced in basolateral membrane vesicles but not in brush border. Cells were found to retain functional integrity and transport capabilities long enough to allow Cl^– fluxes to be measured. Both efflux and uptake experiments indicate that a Cl^–/HCO ₃ ^– antiport, inhibited by 4,4-diisothiocyanostilbene-2-2-disulfonic acid (DIDS), is functional under resting conditions.     

Surface state of molybdenum cations in MoO3/CeO2

Conclusion  

土壤中碳酸钙和有机碳测定的一种新方法

利用阿曼苏丹国的一千多个土壤样品,对土壤中碳酸钙和有机碳测定的实验方法进行了研究。发现实际碳酸钙的含量可由“亚稳态”时碳酸钙含量乘以适当的因子代替,从而大大提高了工作效率。而利用有机碳/全氮(C/N)的特殊规律,则可建立一个确定“有机碳”实验中所需土壤样品量的新方法。     

LaCeCuMn/γ-Al2O3纳米稀土催化剂的制备及性能研究

以纳米纤维状γ-Al₂O₃为载体，采用工艺路线简单的浸渍法制备了La_xCe_1-xCuMn纳米稀土催化剂，并应用微反活性评价装置测试了对CO和C₃H₈的氧化活性。利用XRD，TEM，BET等手段，分析了产品的结构和粒子形貌。实验结果表明，催化剂活性组分在载体上分散比较均匀，平均粒径在15～20nm之间，为纳米级催化剂。La物质的量为0.4mol、活性组分质量分数为15.04%时，制得了较为纯净的钙钛矿催化剂，CO和 C₃H₈氧化反应中起燃温度分别可以达到161，186℃，且二者的最终转化率均在99%以上。     

IPSec在应用中与双向NAT的兼容方案

在广泛应用的基于IPSec的VPN系统中,为解决NAT出现给网络安全带来的复杂性,针对IPSec协议与NAT协议所存在的矛盾,并从VPN系统的角度提出了协作方式基于隧道接力的IPSec解决方案,从而解决了IPSec隧道穿透双向NAT的问题,最后进行了设计实现.