Lead ion(Pb2+)is one of the most hazardous heavy metal ions in aquatic environments.Carbon materials and manganese dio-xide(MnO2)have been shown to be prospective adsorbents to cope with the lead pollution.In this study,a novel hollow carbon@MnO2 composit
Water flux and hydrophobic durability play important roles in membrane distillation(MD)applications.Compared with the method of adsorbing nanoparticles by electro-static adsorption,the surface roughness constructed by chemical bonding is more conducive to
Ce/ZnO decorated carbon nanofibers(CNFs)heteroarchitec-tures(Ce/ZnO/CNFs)have been synthesized using electro-spinning technique followed hydrothermal method,which have a high visible light photocatalytic activity.The samples were characterized by means of
The Co3O4 decorated TiO2 nanotube arrays(NTAs)coatings are fabricated by the combination of anodization and impregna-ting methods.It is found that the introduction of Co3O4 can reduce the diffraction intensity of(101)plane of the TiO2 and accelerate the s
Hydrogenation of methyl p-hydroxyphenylacetate has been used for the synthesis of p-hydroxyphenyl ethanol.The reaction was catalyzed by CuiZrj-x％(mass fraction)carbon nanotubes(CNTs)catalysts.Incorporation of a minor amount of CNTs into CuiZrj oxide can v
Based on the functional properties of electrospun cellulose nanofibers(CNF),scientists are showing substantial interest to enhance the aesthetic properties.However,the lower color yield has remained a big challenge due to the higher surface area of nanofi
Nanomolecular imaging and biosensing is an interdisciplinary research field generated from the combination of nanoscience,molecular imaging and biomedicine.
G-Quadruplexes(GQs),which are formed by G-rich DNA sequences in human telomeres,have become an attractive target for cancer treatment.The ligands to stabilize the con-formation of human telomeric GQs in vivo are particularly important for structure-based
Pretargeting is an innovative and promising approach in nuclear medicine for targeted-imaging/therapy through the following bioorthogonal reactions.It requires two reactive participants,one of which is a targeting vector and the other is a small radiolabe
1引 言 rn1.1背景简介rn设A ∈Rn×n为n阶实对称矩阵,矩阵A的特征值分解是找正交矩阵U ∈Rn×n,使得rnA=UΛUT,(1.1)rn其中UT指U的转置,A为对角矩阵,且A=diag(λ1,λ2,...,λn),其中λi,i=1,...,n是矩阵A的特征值.矩阵A的奇异值分解为rnA=UΣUH,(1.2)rn其中,U ∈ Cn×n是酉矩阵,UH是U的共轭转置,Σ是非负实对角矩阵.当A正定时,奇异值分解和特征值分解等价.对一般实对称阵,奇异值和特征值绝对值相同.