Adaptive tracking control for actuator failure compensation based on MT-filters

<正> This paper considers the problem of actuator failure compensation for a class of nonlinearsystems in the form of output-feedback.MT-filters are exploited to estimate the unmeasured states.The backsteppping technique is used to construct the controller recursively.The proposed compensationscheme can grantee the boundedness of all the closed-loop signals and asymptotic output tracking.Thetheoretical results are illustrated by a simulation example.     

基于数字证书识别及校验的物联网固件安全检测系统的设计与实现

设计并实现了一种基于数字证书识别及校验的物联网固件安全检测系统。针对下载的不同厂商的固件，研究了在固件中识别公钥、私钥、签名等数字证书文件的方法，设计了对证书内容进行有效性校验的模型，构建了证书管理数据库，在此基础上实现了完整的固件安全检测系统。实验结果表明，该系统可对固件中的证书进行高效识别和有效性校验，并对样本外存在数字证书安全缺陷的固件进行了成功检测。     

Solidification microstructure and phase constitution of Fe-7.5%Mo-16.5%Si ternary quasiperitectic alloy

Solidification of Fe-7.5%Mo-16.5%Si ternary quasiperitectic alloy is investigated by using differential scanning calorimetry (DSC) and drop tube containerless processing techniques.The primary phase is identified as R (Fe5Mo3Si2) and the quasiperitectic phases are τ1 (Fe5MoSi4) and Fe3Si.With the decrease of droplet diameter, the cooling rate and undercooling of the droplets in-crease rapidly.The experiment result indicates that the solidification microstructure is composed of remnant primary phase, qua-sip...     

次血红素六肽对纳米金诱导线虫热激损伤的保护作用

通过考察Au纳米球壳对野生型秀丽隐杆线虫的光热转换作用, 建立一种新型的秀丽线虫热激损伤模型. 实验结果表明, 在纳米金浓度为30 μmol/L, 红外光强为3 W/cm2, 照射8 min的热激条件下加入次血红素六肽对线虫有保护作用.     

Boundary control of two PDE’s separated by interface conditions

<正> This paper discusses the null boundary controllability of two PDE's,modeling a compositesolid with different physical properties in each layer.Interface conditions are imposed.     

Comparative and statistical analysis of nAChR sequences: An <Emphasis Type="Italic">ab initio</Emphasis> approach to the origin of molecular discrimination

Compared with traditional structure-based approaches for the identification of species-specific ligands, the ab initio approach, based on large-scale protein sequences from different species, has been used to locate specific sites that may be important to the molecular selectivity of species. Statistically significant differences in the distribution of residues in different species and differences in the physicochemical properties of residue-specific sites may largely account for species selectivity. The nicotinic acetylcholine receptor (nAChR), an important neuro-receptor with significantly different ligand selectivity in different species, was used to test our method. Because of the lack of nAChR structural information, the mechanism of ligand discrimination is unclear which hinders attempts at novel molecular design. In this study, the specific site residues 186 and 189 in the principal subunits and residues 34, 55, 56, 57, 106 and 112 in complementary subunits of nAChR were identified by applying our method with stringent statistical cutoffs. These sites were predicted to contribute to ligand selectivity and this result coincides well with the known experimental data.     

ρ~n次幂对径向波函数R_(ne)平均值的计算通式

本文用广义Ｌａｇｕｅｒｒｅ多项式的母函数表达式，证得文献〔１〕中，计算ρｎ次幂的类氢原子径向波函数Ｊｄ平均值的通式。     

有机钛耐高温交联剂的合成及性能评价

以四氯化钛、异丙醇、乳酸、乙酰丙酮和三乙醇胺原料同系列有机钛酸酯交联剂、结果表明，该产品对天然植物胶有良好的交联和很高的耐温性，可满足油田油、气井压裂施工需要。     

纳米金刚石的熔点和德拜特征温度

报道了炸药爆轰法制备的纳米金刚石的熔点及德拜特征温度。根据纳米金刚石的Ｘ射线衍射强度，计算得出了其德拜特征温度为４１１．７Ｋ，比高温高压俣成大颗粒金刚石单晶的德拜特征温度（２２００Ｋ）低了５倍多，且其原子晶格振动的振幅比高温高压合成大颗粒金刚石单晶原子的振幅增大了４．３７倍，用Ｌｉｎｄｌｍａｎ公式计算出纳米金刚石的熔点为２０７０Ｋ，约为高温高压合成出大颗粒金刚石单晶熔点（４４００Ｋ）的一半。     

最弱受约束电子势模型下KrⅡ离子Rydberg态能级的研究

在最弱受约束电子势模型的理论框架下，通过对最弱受约束电子的识别，将Martin关于单价原子量子亏损公式推广到实为开壳层的多价原子(离子)系统，并且保留了能量对量子数亏损的高次依赖关系，计算了KrⅡ离子的4s24p4 (1D)nd’2D3/2，4s24p4 (1D)nd’2D5/2，4s24p4 (3P)np和4s24p4 (1D)nd’2S1/2系列Rydberg态的能级，理论计算值与实验值符合很好，两者的相对误差除了个别数据外，不超过8.24×10-4，达到了很高的精度.