A robust method for inverse halftoning via two-dimensional nonlinear pyramid

Based on the principle of spatial pyramid for signal, a multi-scale transform of two-dimensional (2D) interpolating pyramid is constructed by the nonlinear median operator.     

非齐型空间中一类次线性算子的交换子在Morrey—Herz空间上的有界性

讨论了非齐型空间中由一类次线性算子分别与RBMO函数以及Lipschitz函数生成的交换子在Morrey—Herz空间上的有界性,证明了交换子从MKp1,q1^α,λ（μ）的有界性,以及从MKp1,q1^n（1-1/q1）,λ（μ）到WMKp2,q2^（1-1/q1）,λ（μ）的有界性。     

磁性微球及其在免疫学中应用的研究进展

磁性微球作为一种新型功能高分子材料,在生物医学领域有着广泛的应用前景。特别是在免疫学方面,常用于细胞分离、疾病诊断、食品检测等,并取得了显著的科研成果。本文介绍了磁性微球常见的制备和表面改性方法,并着重综述了其在免疫学中应用的研究进展。     

有源和无源的无磁非互易研究进展

根据洛伦兹互易定理,在通常的光学系统中,交换信号源和探测器的位置后接收到的光信号不变。这为光路设计和分析带来了方便。在全光通信和量子网络中,需要有效地控制光信号的定向传输以避免反射光对信号的干扰、分离相向传输的光信号等,因此需要只允许光单向传输的非互易器件。以磁光隔离器为背景切入,简单介绍磁光领域的研究现状。重点从有源和无源两个方面对无磁非互易领域的发展进行综述,以展现量子光学在无磁非互易领域的重要应用。     

Tunneling-induced π-phase shift with a single-photon signal field in asymmetric double quantum wells

A theoretical investigation is carried out into the cross phase modulation （XPM） in an asymmetric double A1GaAs/GaAs quantum wells structure with a common continuum. It is found that, combining resonant tunneling-induced transparency and constructive interference in the third-order Kerr effect, a giant XPM can be achieved with vanishing linear and nonlinear absorptions, accompanied by the velocities of the probe and signal fields being matched. Furthermore, this giant XPM could induce a π-phase shift at a single-photon level which is favorable for the applications in two-qubit quantum logic gates.     

贵州关岭大寨高速远程滑坡—碎屑流研究

2010年6月28日,贵州关岭因突降暴雨发生高速远程滑坡,滑程约1.5km,体积约174.9万m³,两个村组被毁,99人遇难。滑坡区位于西南地区常见的煤系地层区,上部为灰岩、白云岩,中部为相对较缓的砂岩地层,下部为页岩、泥岩地层,局部含煤,具有上硬下软的山体地质结构和上部富水下部隔水的水文地质结构,极易形成滑坡地质灾害。从地形上看,斜坡上陡下缓,形似“靴状地形”,上部陡峭地形导致山体易于失稳,而中下部开阔伸展良好的沟谷提供了远程的运动条件,较大的势能向动能的转化,容易形成高速远程滑坡—碎屑流。6月27日和28日的降雨是触发此起特大灾害的主要原因,其24h降雨量达310mm,超过了当地近60a来的气象记录,分析表明,降雨产生的沟谷径流量是平时强降雨(100～150mm·d^-1)的沟谷径流的2倍之上,一是在滑源区砂岩裂隙岩体中形成静水压力和渗透压力,触使滑坡的失稳下滑; 二是在沟谷中产生地表径流,为碎屑流远程流动形成饱水下垫面,导致了碎屑流流动距离和速度的显著增加。近年来随着极端强降雨等灾害性天气的重现期缩短,高速远程滑坡造成的群死群伤特大地质灾害在我国呈逐渐增加趋势,应加强对这种灾害类型的调查与防范,特别是要进行滑坡安全避让范围和逃逸速度的研究。     

Discreteness criteria in <Emphasis Type="Italic">PU</Emphasis> (1, <Emphasis Type="Italic">n</Emphasis>; <Emphasis Type="Italic">C</Emphasis>)

In this paper, we study the discreteness for non-elementary subgroups in PU (1, n; C), and several discreteness criteria are obtained.     

Heterostructured CoO/3D-TiO<Subscript>2</Subscript> nanorod arrays for photoelectrochemical water splitting hydrogen production

Homogeneous p-type cobalt (II) oxide (CoO) nanoparticles were successfully deposited on n-type three-dimensional branched TiO₂ nanorod arrays (3D-TiO₂) through photochemical deposition and thermal decomposition to form a novel CoO/3D-TiO₂ p-n heterojunction nanocomposite. Due to the narrow band gap of CoO nanoparticles (~2.4 eV), the as-synthesized CoO/3D-TiO₂ exhibited an excellent visible light absorption. The amounts of deposited CoO nanoparticles obviously influence the hydrogen production rate in the photoelectrochemical (PEC) water splitting. The as-synthesized CoO/3D-TiO₂-5 obtains the highest PEC hydrogen production rate of 0.54 mL h^?1 cm^?2 after five-time CoO deposition cycles (at a potential of 0.0 V vs Ag/AgCl). The photocurrent density of CoO/3D-TiO₂-5 is 1.68 mA cm^?1, which is ca. 2.5 times greater than that of pure 3D-TiO₂. The results showed that the formation of internal electrical-field between the CoO/3D-TiO₂ heterojunction, which has a direction from n-type TiO₂ to p-type CoO, facilitated the charge separation and transfer and resulted in a high efficiency and stable PEC activity.     

Duality of weighted multiparameter Triebel-Lizorkin spaces

In this paper, we reintroduce the weighted multi-parameter Triebel-Lizorkin spaces F_p~(α,q) (ω; R~(n_1)× R~(n_2)) based on the Frazier and Jawerth' method in [11]. This space was′firstly introduced in [18]. Then we establish its dual space and get that(F_p~(α,q))*= CMO_p~(-α,q') for 0 p ≤ 1.