On the Equivalent Keys in Multivariate Cryptosystems

The number of equivalent keys in multivariate cryptosystem is closely related to the scheme security. This study analyzes the structure of the private key space in some multivariate schemes.The result gives the lower bounds on the number of equivalent keys of some variants of the hidden field equation (HFE) scheme including plus, minus-plus, embedding, and internal perturbation. This method estimates the number of invertible transformations which maintain the form of the central map invariant. Furthermore,a formal proof shows that the two modifications of fixing and embedding are equivalent in security analyses of multivariate schemes. Also this paper corrects previous proofs in Wolf’s work on the number of equivalent keys in HFEv,the unbalanced oil and vinegar (UOV) scheme, and the stepwise triangular systems (STS).     

MBBM方程和Vakhnenko方程的新精确解

应用新的修改的代数方法，求出MBBM方程和Vakhnenko方程的新精确解．这些解中包含有三角函数解、Jacobi椭圆函数解等．     

改性沥青混凝土配合比设计

鉴于聚合物改性沥青可以明显改善沥青混凝土路面的低温和高温性能,延长道路使用寿命,因此聚合物改性沥青已经成为全球沥青路面的首选。本次高速公路项目的路面上面层组成配合比设计就添加和利用了石灰岩集料和SBS改性沥青(基质沥青为韩国SK重交沥青AH-70)来进行配合比筛选和设计,并得出最佳沥青用量和沥青混凝土密度,总结SBS改性沥青混凝土相比于普通沥青混凝土具有更好性能。     

A bioinformatic evaluation of potential allergenicity of 85 candidate genes in transgenic organisms

The potential of genetically modified organisms(GMOs) to increase allergenicity or predispositions to allergies has attracted much attention.An approach that will properly and holistically evaluate the allergenicity of GMOs is yet to be found.Here,85 transgenes that have been reported in both international and domestic studies during recent years are summarized case by case;49 of the transformed genes were from plant sources and 36 were from animal sources.EVALLERTM,a web server for the in silico assessment of potential protein allergenicity,was used to evaluate the potential of the transgenic proteins as allergens.The biomedical journals listed in Highwire(http://highwire.stanford.edu/) were searched and reviewed to decipher whether any of the transformed genes were linked to allergenicity or human health.The EVALLER analysis identified 5 allergenic genes,whilst our literature review found 11 genes that were either related to allergic cases or to clinical adverse events;all 16 of these genes have been used in GMOs.The analysis pathway that we have developed can help guide the selection of genes to be used in genetic modification.The pathway also provides a paradigm for allergenicity analysis of transgene candidates.     

PbO过量对大各向异性改性PbTiO_3性能的影响

研究了一种新型的具有大各向异性的改性PbTiO3 陶瓷材料的性能随着材料制备中铅过量的变化而变化的关系 ,其中包括材料的机电耦合系数、机械品质因素、介电损耗等 .研究结果表明当铅过量为 1%～ 2 % (摩尔百分比 )时 ,材料的性能达到较佳 .通过分析认为 :当铅不足时 ,主要是由其它的B位掺杂离子取代A位的铅 ,从而造成配方B位离子的重新排列 ,材料的性能因而有所下降 ;当铅过量时 ,铅离子将取代A位的钙 ,部分钙离子将进入晶界 ,从而降低了材料的性能     

角支矩形底球面扁壳的弯曲

对壳体引入推广的广义简支边的概念,并用叠加法求得在复杂边界条件下例如角支矩形底球面扁壳弯曲的解析解。     

改性PAN铸膜液的热力学条件与膜的结构和性能的关系

本文讨论了聚丙烯腈铸膜液中添加剂的种类及用量,PAN含量和温度,以及PAN-Cell共混液中纤维素含量等因素与膜的形态结构、微孔孔径、孔隙率、膜的截留率和水通量的关系.结果表明,上述诸因素对膜的结构和性能有明显的影响,可通过调节铸膜液的热力学条件,在较大范围内调整膜的结构和性能,为制得适用于多种用途的系列膜奠定基础.     

表面修饰电极反应动力学的研究

本文提出了一种描述表面修饰电极(SME)反应动力学行为的理论模型,并以普鲁士蓝修饰电极为例,通过实验对理论作了验证。结果表明,理论预期与实验结果符合较好。由此推证,用电荷传输扩散系数Dct表征SME的电催化能力是合适的。Dct可由电位阶跃实验求得。     

磷酸酯酰氧基异辛醇铝酸酯（PIA）偶联剂性质的研究

本文报导磷酸酯酰氧基异辛醇铝酸酯（ＰＩＡ）的ＩＲ、２７Ａｌ－ＮＭＲ、ＤＴＡ和水解性等理化性质的测定结果，以及ＰＩＡ改性碳酸钙在液体石蜡中的粘度、填充量、沉降性，及ＰＩＡ适用范围的主要研究结果。