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Characteristics of Aerobic Biofilter Backwash
曝气生物滤池反冲洗的特性

Zhang Jie,Chen Xiurong,<br>,
环境科学 , 2003,
Abstract: Periodic backwash is the vital stage to keep up the aerobic biofilter's performance. Under the same backwash conditions, a thorough study was done to review the influences on the performances of backwash in such aspects as backwash regimes, biofilter shapes. The experimental results show that the impulse backwash regime was superior to continuous backwash in the backwash performance and that the expansive flow aerobic biofilter was superior to the uniform flow aerobic biofilter in the performances of both backwash process and filter bed recovery. Then the optimal combination of the two factors i.e. the combination of impulse backwash mode and expansive flow filter was determined. Under the fixed filtration conditions, the appropriate impulse backwash parameters of expansive aerobic biofilter were determined as follows: the backwash air-flow intensity was 8-10 L/(s.m2), the backwash water-flow intensity was 2-4 L/(s.m2), and the backwash duration was 5 min.
CRYSTAL-FIELD ENERGY LEVELS OF BeAl2O4:Cr3+
BeAl2O4:Cr3+的晶场能级

WU GUANG-ZHAO,ZHANG XIU-RONG,<br>吴光照,
物理学报 , 1983,
Abstract: The 4T2,4T1, and 2E levels of Cr3+ ion on the mirror-site in an alexandrite crystal are in relation to the laser operation of that material. The 4T2 (or 4T1) level splits into three sublevels. In order to determine the energy levele diagram of Cr3+ ions in chrysoberyl, the splitting of the 4T2 and 4T1 are calculated. We have discussed the anisotropic transition intensities of corresponding absorption bands and have found a method to fit the spectra. Furthermore, the values of the parameters K1 and K2 that represent the magnitude of the splitting are obtained, and the crystal field energy level diagram of BeAl2O4:Cr3+(II), labelled by the irreducal representations of point group C3, is given.
Theoretical study on structural and electronic properties of WnNim(n+m=8) clusters
WnNim(n+m=8)团簇结构与电子性质的理论研究

Zhang Xiu-Rong,Li Yang,Yang Xing,<br>,李扬,杨星
物理学报 , 2011,
Abstract: 采用密度泛函理论(DFT)中的B3LYP方法,在Lanl2dz基组水平上对WnNim(n+m=8)团簇的各种可能构型进行了几何参数全优化,得到了它们的基态构型;并对基态构型的平均结合能、Wiberg键级(WBI)、磁学性质、NBO进行了分析,结果表明:团簇随着W原子数的增多,稳定性增强,n≥5时,结构中都含有纯钨团簇的结构基元;W—W键级高于W—Ni键和Ni—Ni键;W5Ni
Asymptotic Properties of Krawtchouk Polynomials
Krawtchouk多项式的渐近性态

ZHU Xiaofeng,ZHANG Meirong,LI Xiuchun,<br>朱晓峰,,
系统科学与数学 , 2008,
Abstract: In this paper, the asymptotic properties of Krawtchouk polynomials and their zeros are investigated. Firstly, a uniform asymptotic expansion for Krawtchouk polynomials $K_n \left( {\lambda N}\right)$ ($\lambda = \frac{x}{N},0 < \lambda < 1)$ is derived, for any fixed $v = \frac{n}{N} \in (0,q)$ or $(0,p)$. Then asymptotic expansions of their zeros are given. Finally the error bound $O(n^{-\frac{4}{3}})$ is obtained.
Phase-shifting Angle Choice and Phase-shifting Error Elimination in In-line Phase-shifting Digital Holography
同轴相移数字全息中相移角的选取及相移误差的消除

(,<br>,国承山,振宇,,刘轩,王慧田
光子学报 , 2004,
Abstract: The influence caused by different phase-shifting a ngle of reference wave in recording and the phase-shifting error on the quality of the reconstructed image is investigated in two-step phase-shifting in-line digital holography, and an effective method of eliminating the phase-shifting error is presented, in which the summation of the intensity bit errors of the reconstructed image is taken as an evaluation function for an iterative algorithm to find the exact phase-shifting value. Then the optimal choice of the phase-shifting value of reference wave is simulated by computers. The simulation results show that the reconstructed image noise is weak when the phase-shifting value is in a certain range. At last, the feasibility of the method of eliminating the phase-shifting error is demonstrated by computer simulation also.
Calculation study of the geometry structures and electronic properties of heterofullerenes C19M(M=Cr,Mo,W)
异质富勒烯C19M(M=Cr,Mo,W)的结构和电子性质的计算研究

Zhang Xiu-Rong,Bao Hong-Lu,Li Yang,<br>,包虹璐,李扬
物理学报 , 2012,
Abstract: The possible geometrical structures of C19M(M=Cr,Mo,W) molecules are optimized by using the density functional theory (B3LYP) at the LANL2DZ level. For the ground state structures of C19M(M=Cr, Mo, W) clusters, the physical and the chemical properties are studied. The results show that the kinetic stabilities of the C19M clusters with different M atoms are almost the same. Theis thermodynamic stabilities are obviously increased with the increase of atomic number. It can be found from the frontier orbital that the M atoms have the effects on the orbits more or less. M atom contribution to the orbits roughly increases with M atomic number increasing. A great many of positive charges accumulate on the M atoms in C19M clusters. Their aromaticity decreases with the increase of atomic number.
Theoretical study of electronic structure and optical properties of OsnN0,±(n=1—6) clusters
(OsnN)^0,±(n=1-6)团簇电子结构与光谱性质的理论研究

Zhang Xiu-Rong,Wu Li-Qing,Rao Qian,<br>,吴礼清,饶倩
物理学报 , 2011,
Abstract: 采用密度泛函理论中的杂化密度泛函B3LYP方法在赝势基组LANL2DZ水平上对OsnN0,±(n=1—6)团簇的各种可能构型进行了几何结构优化,得出了它们的基态构型,并对基态结构的磁学性质、自然键轨道(NBO)、光谱和芳香性进行了理论研究.研究结果表明:OsN-和Os5N-团簇发生了"磁矩猝灭"的现象,在Os2N和Os4N0,±团簇中Os原子与N原子之间属于反铁磁性耦合;团簇的NBO电荷分布取决于原子的相对位置,处于端点的N原子发生电荷转移要比处于中间的N原子明显;OsnN0,±(n=1—6)团簇的红外光谱和Raman光谱的各振动峰明显;Os5N-团簇的芳香性最强.
纳米材料的分类及其物理性能

现代物理知识 , 2002,
Abstract: 纳米技术是 2 0世纪 80年代末迅速发展起来的一门交叉性很强的综合学科 ,是在 0 .1— 10 0纳米尺度上研究和利用原子与分子的结构 ,特性及其相互作用的高新技术。著名的诺贝尔奖获得者费恩曼在 6 0年代就预言 :如果对物体微小规模上的排列加以某种控制的话 ,物体就能得到大量的异乎寻常的特性。他所说的物体就是现在的纳米材料。纳米材料研究是目前材料科学研究的一个热点 ,纳米技术被公认为是 2 1世纪最具有前途的科研领域。1.纳米材料的分类以“纳米”来命名的材料是在 2 0世纪 80年代 ,它作为一种材料的定义把纳米颗粒限制到 1—10 0nm…
油脂中固醇类的高速液相色谱法定量

食品科学 , 1988,
Abstract: ?<正>本文使用高速液相色谱法研究了固醇类的分析。作为分析对象的固醇探用的是c27的胆固醇,c28明的麦角固醇和菜油固醇,c29的豆固醇和β-谷固醇,还有c30的角鲨烯(三十碳六烯)。固定相用反相型的zorbaxods,流动相用非水系的甲醇一四氢呋喃(99:1),检测波长用uv-205nm。用本方法定量,各固醇峰的高
os_n~(0,±)(n=2~5)团簇的结构与稳定性的理论研究
,张伟
江苏科技大学学报(自然科学版) , 2009,
Abstract: ?采用密度泛函理论(densityfunctionaltheory,dft)中的b3lyp杂化密度泛函,在lanl2dz赝势基组水平上对os0n,±(n=2~5)团簇的几何构型、振动频率和稳定性进行了理论研究.结果表明,os0n,±(n=2~5)团簇的稳定构型中三聚物是三角形结构,四聚物以正方形最为稳定,五聚物存在两个竞争的基态构型,os5团簇的结合能最大,热力学稳定性最好.
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