1-硫杂-4,8-二氮杂螺[4.5]癸烷-3-羧酸类衍生物的合成

以L-半胱氨酸为起始原料,经酯化、成环、水解、缩合、去保护五步反应合成了6个新型的1-硫杂4,8-二氮杂螺[4.5]癸烷-3-羧酸类衍生物,其结构用1H NMR和LC-MS表征.     

Correlation power analysis of DECIM～v2

Power analysis has been a powerful and thoroughly studied threat for implementations of block ciphers and public key algorithms but not yet for stream ciphers.Based on the consumed power differences between two neighboring clock cycles,this paper presents a correlation power analysis(CPA)attack on the synchronous stream cipher DECIM～v2(the tweaked version of the original submission DECIM).This attack resynchronizes the cryptographic device ceaselessly with many different initialization values(IVs)to obtain enough power traces.Then by modeling the statistical properties of the differential power traces with the correlation coefficients,the proposed attack algorithm can completely reveal the secret key of DECIM～v2.Furthermore,a simulation attack is mounted to confirm the validity of the algorithm.The results show that the entire secret key of DECIM～v2 can be restored within several minutes by performing 12 CPA attacks.It seems that there are still some defects in the design of DECIM～v2 and thus some further improvements should be made to resist the proposed attack.     

惠民凹陷构造应力场与油气运聚模拟分析

采用有限元法对惠民凹陷东营组沉积末期、馆陶组沉积末期和现今构造应力场进行了二维数值模拟，研究了地应力场的分布特征及其对油气运移的控制作用，并预测了油气运聚的优势区域。研究结果表明，在东营组沉积时期，双丰构造、临盘构造、商河构造及营子街构造带是油气运移的主要指向区；在馆陶组沉积末期，商河、玉皇庙、江家店及瓦屋等地区是油气运移的有利指向区；现今构造应力场分析表明，惠民凹陷曲堤地垒应力值最低，说明最有利于油气的聚集。研究结果与构造地质及石油地质分析结论相一致。     

Study on Spatial Development of Yangtze River Delta Region Since 1980s

The Yangtze River Delta(referring to the YRD hereafter) region has been developed very early,being the birthplace of Wu-Yue Culture and national industry of China, and has become the important core area of economic society of China for a long period. During the latest 20 years after the reform and opening up and along with the rapid     

MOLECULAR DYNAMICS SIMULATION OF STRUCTURAL CHANGES OF LIQUID Fe_3Al

ＩＮＴＲＯＤＵＣＴＩＯＮＬｉｑｕｉｄｍｅｔａｌｉｓａｖｅｒｙｄｉｆｉｃｕｌｔａｎｄａｔｒａｃｔｉｖｅｂｒａｎｃｈｏｆｃｏｎｄｅｎｓｅｄｓｔａｔｅｐｈｙｓｉｃｓ．Ａｓｆａｒａｓｔｈｅｍｅｔａｌｃｒｙｓｔａｌｉｓｃｏｎｃｅｒｎｅｄ，ｗｅｃａｎｕｓｅ１４...     

亚麻低温过氧化物漂白

研究了亚麻在低温过硫酸钠中用过氧化氢漂白的效果。借助白度效果和FT-IR光谱对工艺进行评定，得出该技术的合理指标。     

新型食品添加剂——大豆水解蛋白调味料的研制

以大豆饼粕为原料用酸水解法制备新型调味料,对酸法工艺进行细致研究,确定、完善水解工艺条件,并以水解物为基料研究出不同风味的调味料。同时给出了四种水解蛋白产品的理化检测结果,最后对产品的特性进行了讨论与评价。     

植物氮素含量双波长光学遥测系统的研制

植物氮素含量与可见光和近红外光反射系数的比具有很好的相关性,因此利用光谱反射系数可以测定植物氮素含量,为合理的施用养分提供依据。详细讨论了所研制的基于LED光源的植物氮素含量光谱探测仪的设计原理和实现方法,对测量结果进行了分析讨论,结果表明研制的双波长植物氮素含量探测仪满足测量要求。     

超纯净化18Ni（350）马氏体时效钢的研究

采用超纯净化冶炼工艺将１８Ｎｉ（３５０）型马氏体时效钢中的主要有害元素降低到１０－５的极限低水平，并适当调整了主要强化合金元素含量，达到了有效提高马氏体时效钢强韧性的目的．实验结果表明，超纯净化马氏体时效钢的断裂韧性在同一强度级别下较现有普通马氏体时效钢提高 １０％－３０％，最高达到 ６１ＭＰａ·ｍ１／２．显微组织结构分析表明，在超纯净化条件下，ＴｉＮ是钢中的主要夹杂物，其体积和数量都大幅度降低 同时钢中Ｔｉ等合金元素的利用率也显著提高，有助于提高马氏体时效钢的强韧化水平．     

Isotope constraints on the hydraulic relationship of ground-waters between Quaternary and Tertiary aquifer in Xi''''an area,Shaanxi province

Isotope techniques are increasingly used in evaluating the hydraulic connections between groundwaters in different aquifers, and can improve the geological and hydrogeological database. In the Xi'an area, the upper Quaternary aquifer may have hydraulic connection with the lower aquifer, the Tertiary aquifer, based on geological analyses. δ2H, δ18O, 3H, and 14C data of groundwater samples provide further evidence for the existence of the hydraulic connection between both aquifers.