UV-Vis Spectrum and the Third-order Nonlinear Optical Properties of the Chiral Camphorderived β-diketonate Platinum Complexes

UV-Vis spectrum and the third-order nonlinear optical properties of the chiral camphor-derived β-diketonate have been studied at the B3LYP/6-31G＊ level. The results showed that the introduction of electron-drawing group -CF3 and -C3F7 on β-diketonate made the strongest absorption peak red-shift and the lowest energy absorption blue-shied. Introduction of -OC2H5 on the benzene or pyridine ring made the lowest energy absorption blue-shift. When the -C2H3 was introduced on the benzene or pyridine ring, the lowest energy absorption was red-shifted. Introduction of electron-donating group on β-diketonate can enlarge their nonlinear optical properties. On the contrary, the introduction of electron-drawing group dropped it down.

Synthesis, Structure and Third-order Non-linear Optical Properties of Tungsten Dioxo Complex with 8-Hydroxyquinoline Ligand WO_2(C_9H_6NO)_2

Tungsten dioxo complex WO 2(C 9H 6NO) 2 was obtained via the low temperature solid-state reaction of(NH 4) 2WS 4, 8-hydroxyquinoline(8-hq) and(CH 3) 4NI, and it was characterized by means of elemental analyses, IR spectroscopy and X-ray diffraction analysis. The crystal of the title compound belongs to monoclinic, space group C2/c, with the crystal cell parameters: a=1.3316(3) nm, b=0.94444(19) nm, c=1.3485(3) nm, β=109.66(3)°, V=1.5970(6) nm 3, Z=6. The title compound possesses a supramolecular structure formed through hydrogen bonds and π-π stacking interactions. The third-order non-linear optical(NLO) properties of the title compound were also investigated. The third-order non-linear absorption coefficient α 2 and refractive index n 2 are 0.85×10 -11 m/W -1 and -1.5×10 -19 m 2/W, respectively. The third-order non-linear susceptibility χ (3) is 3.03×10 -13 esu for 3.8×10 -5 mol/L sample concentration.

Crystal Structure and Third-order Nonlinear Optical Property Studies on Copper(Ⅱ) Complex Containing NS Donor Ligand

A novel Schiff base ligand (HL) derived from S-methyldithiocabazate and pmethoxylbenzaldehyde was prepared and characterized. The Schiff base ligand acts as a single negatively charged bidentate ligand fondng D-M-D type comPlex (D=donor, M=metal). Single crystal X-ray diffraction analysis of the copper(Ⅱ) complex established that the geometry around Cu (Ⅱ) is square-planar with two equivalent M-N and M-S bonds. The two phenyl rings and the coordinated plane are almost in one plane fotheng an electronic delocalization system. Their thirdorder response was also studied.

Investigation on Third-Order Optical Nonlinearities of Two Organometallic Dmit2- Complexes Using Z-Scan Technique

The third-order nonlinear optical properties of two dmit organometallic complexes, [(CH3)4N] [Au(C3S5)2] (MeAu) and [(CH3)4N][Ni(C3S5)2] (Me Ni) in acetone solutions, were characterized us- ing a short pulse Z-scan technique at 1064 nm wavelength. Self-defocusing effects were found in both samples and stronger saturable absorp-tion was observed in MeNi solution comparing with that of MeAu. The origins were analyzed for the differences between the results. Two figures of merit W and T were also calculated to evalu-ate the suitability of two materials for all-optical integrated devices. The results of W=22.84 and T≈0 of MeAu make it an excellent candidate for the all-optical applications.

BLIND AND COMPLETE MODELING OF LINEAR SYSTEMS USING THIRD ORDER CUMULANTS

This paper presents a novel approach to structure determination of linear systems along with the choice of system orders and parameters. AutoRegressive （AR）, Moving Average （MA） or AutoRegressive-Moving Average （ARMA） model structure can be extracted blindly from the Third Order Cumulants （TOC） of the system output ts, where the unknown system is driven by an unobservable stationary independent identically distributed （i.i.d.） non-Gaussian signal. By means of the system order recursion, whether the system has an AR structure or has AR part of an ARMA structure is firstly investigated. MA features in the TOC domain is then applied as a threshold to decide if the system is an MA model or has MA part of an ARMA model. Numerical simulations illustrate the generality of the proposed blind structure identification methodology that may serve as a guideline for blind, linear system modeling.

The Application of Cumulants Slices in Fault Diagnosis

Complex third-order cumulant has different definition forms. Different forms have different coupling properties, and the generated complex cumulants slices contain different coupling information of signals. In experiments, using the different definitions, the same coupling method is applied to both specific fault signals and normal signals. Furthermore, complex third-order cumulant slices spectrum is defined, and it is used to analyse the coupling features of normal signals and fault signals. Experiments indicate that the detection accuracy rate on the same fault is not the same with the different coupling method, thus, it provides an alternative method to diagnose the specific fault.

面向高维流数据的离群值检测算法

累计局部离群因子(cumulative local outlier factor,C_LOF)算法能有效解决数据流中的概念漂移问题和克服离群点检测中的伪装问题,但在处理高维数据时,时间复杂度较高。为有效解决时间复杂度高的问题,提出一种基于投影索引近邻的累计局部离群因子(cumulative local outlier factor based projection indexed nearest neighbor,PINN_C_LOF)算法。使用滑动窗口维护活跃数据点,在新数据到达和旧数据过期时,引入投影索引近邻(projection indexed nearest neighbor,PINN)方法,增量更新窗口中受影响数据点的近邻。实验结果表明,PINN_C_LOF算法在检测高维流数据离群值时,在保持检测精确度的前提下,其时间复杂度较C_LOF算法明显降低。

氟离子选择电极法测定含铜蚀刻废液中氟含量方法探讨

准确测定含铜蚀刻废液中氟含量是含铜蚀刻废液中铜盐回收的关键,本文就含铜蚀刻废液中氟含量离子选择电极测定方法[1~3]进行探讨与验证。通过样品前处理与试验,离子选择电极一次标准加入法测定下限为0.9mg·L^(-1),离子选择电极标准曲线法测定下限为1.2 mg·L^(-1);两种方法的相对标准偏差在1.2%~1.7%,两种方法的加标回收率在77%~102%,满足工程应用要求。

A Novel Biferrocene Trinuclear Complex with Cis-Configuration

A novel biferocene trinuclear complex for Schiff base ligand S-methyl-N- (ferrocenyl-1-methyl -methylidene) dithiocarbazate thereafter abbreviated as HL) is described. X-ray diffraction studies established the structure of the palladium complex, PdL2. The geometry of Pd (II) in the complex is close to square planar and in novel cis-configuration with two ferrocene moieties on the same side. Degenerate four-wave mixing (DFWM) measurements show that the complex exhibit obvious nonlinear optical response.

基于累积算法的复杂装备维修保障费用模型研究

随着高新装备的复杂度日益增加,复杂装备的维修保障难度逐渐地增大,仅依靠军队自身的保障力量,难以满足复杂装备的维修保障要求。因此,借助工业部门的力量解决复杂装备的维修保障问题,已成为一个必然的装备保障趋势。然而,这种合同式的一体化保障模式,在提升工业部门装备维修保障能力的同时,亦增加了维修保障费用的管理难度。因此,提出了一种基于累积算法的维修保障经费模型,并以某型复杂电子装备为例,进行了验证与说明,具有一定的工程实用价值。

Third-order nonlinear optical adjusting behavior in azobenzene metal complexes

The third-order nonlinear optical(NLO)materials with stimuli-responsive properties have received extraordinary attention due to their controllable photophysical properties.In this work,two attractive metal complexes third-order NLO switches,which are far superior to congeneric optical switches in terms of their performance conversion,versatility,and fast response,were successfully designed and synthesized.The test of their third-order NLO properties proves that the metal complexes exhibit reverse saturable absorption and self-defocusing refraction.After light irradiation,the third-order NLO behavior turns quickly into self-focusing refraction.The relation between the molecular structures and the third-order NLO properties was investigated via1H nuclear magnetic resonance and ultraviolet-visible absorption.The results show that the metal ions have a significant influence on the NLO behavior and reveal the origin of third-order NLO properties via Z-scan determinations,pump-probe technology,and density functional theory calculations.These metal complexes can be used as third-order NLO switches with excellent fatigue resistance and broaden the application range of third-order NLO materials with adjustable performances.

A New Copper（I） Complex Based on Imidazole and Triphenyl- phosphine Ligands： Synthesis, Structure, Third-Order NLO, and Fluorescence Properties

A new candidate [Cu（PPh3）2Him]Br （1, PPh3 =triphenylphosphine, Him= 1-H-imidazole） for nonlinear optical （NLO） materials has been synthesized and characterized crystallographically. The third-order NLO optical properties were measured by the Z-scan technique with an 8 ns pulsed laser at 532 nm. Compound 1 exhibits strong NLO absorptive abilities [a2=（61±5）×10^-12] and effective self-focusing performance [n2=（15±3）×10^-18 m^2·W^-1] in 1.01×10^-4 molodm 3 DMF solution. The compound also exhibits luminescence in DMF solution at room temperature and shows narrow emission with maximum at 382 nm. The electronic structure and photoluminescent process were investigated by means of TD-DFT calculations. The results suggest that the contribution to the frontier orbitals from the Cu-Br σ bond plays a crucial role in its linear optical properties, and the origin of luminescence is attrib- utable to the π＊ → n transitions.

基于复值过程高阶累积量谱的轴心轨迹分析的研究

用复值过程表示轴心轨迹,将复值过程高阶累积量理论引入轴心轨迹分析这一研究领域。结合轴心轨迹的形状讨论了轴心轨迹复值过程的频域特点。证明了混杂在轴心轨迹中的高斯复噪声和实虚部非相关随机噪声的高阶累积量为零,定性说明了该理论亦可有效抑制宽带和窄带噪声。定义了双谱的工频切片和半工频切片。给出了利用双谱幅值谱及其工频切片分析轴心轨迹的计算方法,并将该方法用于转子不对中故障轴心轨迹的分析,验证了该方法同时具有对轴心轨迹的提纯和特征提取的功能。利用工频切片方法对多种故障的轴心轨迹进行了特征提取,其结果表明该方法可将不同故障的轴心轨迹转化为量值的组合,符合机械故障智能诊断的需要。

风电装备传动系统及零部件疲劳可靠性评估方法

载荷是导致失效直接原因,是影响产品可靠性的重要因素,风电装备在服役过程中经历的载荷-时间历程及其不确定性有明显的特点。由于服役方式的特殊性,一个风力发电厂中安装在不同位置的发电装备的服役载荷历程会有明显的差别。从风力发电机服役地域位置和时间两个方面描述风力发电机载荷历程的概率特性,并以此为基础,基于全概率计算原理研究风力发电机传动系统及其零部件疲劳可靠性分析与建模方法。内容包括复杂载荷历程不确定性表征方法、随机变幅载荷历程下疲劳累积损伤与等效循环应力计算方法、根据应力分布和条件寿命分布计算疲劳可靠度的方法,以及根据多级小样本疲劳寿命试验确定不同循环应力水平下疲劳寿命分布参数的方法。

复凝聚法制备茶油微胶囊

以明胶和阿拉伯胶为壁材,采用复凝聚法制备茶油微胶囊。通过对微胶囊成囊形态的观察,并结合微胶囊包埋率,确定制备条件;以包埋率为评价指标,通过正交试验优化获得最佳包埋工艺条件,通过累计释放研究获得胶囊保存条件。结果表明:包埋率较高的条件下,微胶囊呈圆形,分散好;最佳条件为壁材浓度3%,芯材壁材质量比13,搅拌速度900 r/min,反应温度55℃,p H 4.6,搅拌时间15 min,该条件下的包埋率为88.49%;累积释放研究表明,微胶囊贮藏受湿度影响大,湿度越大,累计释放量越多。

复合油藏Fetkovich产量-时间标准曲线计算的新方法

针对圆形封闭复合油藏,提出一种新的用于预测产量的标准曲线图版。沿袭Fetkovich和Carter的思路建立曲线,其原理为一组合适的无量纲绘图变量,理论上只对应唯一一条以边界流动为主的曲线,通过该曲线,可以很容易对油藏流动特征进行分析。该方法具有较强的实际应用价值。

高阶累积量计算优化的仿真研究

高阶累积量由于计算量大而未得到广泛的应用,所以对其进行计算优化以及算法的简化能更好的发挥其优越性,根据推导的非平稳随机过程四阶累积量精确递推估计公式,从减少四阶累积量估计的计算量,增强四阶累积量的工程实用性出发,给出了四阶累积量近似递推估计定理。只要四阶累积量的更新因子满足定理的条件,就能减少计算量,并且使估计的四阶累积量保持抑制高斯噪声的性能,并且根据四阶累积量的优化给出了五阶累计量的优化和仿真。从时域和频域进行了优化仿真,仿真结果证实了估计的有效性。

多通道复信号检测中的几种常用复统计分布

复随机变量的概率密度函数(PDF)及其积累分布函数(CDF)是复值信号检测中计算虚警概率(PFA)和检测概率(PD)的基础.本文分析了复统计分布与实统计分布之间的关系,推导了复F分布和复贝塔分布(中心或者非中心)的PDF和CDF,推导了中心复t分布的PDF,并且给出了部分应用实例.

是岩浆侵入还是构造侵位?——湖北两郧随枣镁铁岩带野外调查纪实

湖北省武当山—随州—枣阳一线存在一呈北西西走向的镁铁质岩浆岩带,长约390km,宽40～100km。其中超镁铁质岩14处,超镁铁质、镁铁质杂岩21处,镁铁质岩250处,出露面积689km2。自上世纪开展1∶20万区调工作迄今,已出版的成果资料一致认为,这些岩体是镁铁质岩浆沿深大断裂侵入而成。笔者等于2005年随机选择了丹江口和随州境内两条地质调查路线,在实地详细观察了35个大小不一的岩体,证实该岩浆岩带的岩体都不是镁铁质岩浆就地侵入形成,而是众多外来的镁铁质岩块与武当山群和随县群浅变质浊积岩共同构成的混杂岩带。这一论断的具体根据为:邻接岩块的围岩普遍不存在热变质;围岩的纹理、层理及韵律层理均有完好保留;岩块边部并无冷凝边及结晶变细现象;岩块内部的相带及条带状构造与岩块的外形无关,并可常见造岩矿物之结晶条带被接触界面斜截;岩块中穿插有不规则状石英脉体及斜长花岗岩脉,但二者从不侵入围岩,这表明,岩块形成时代早于围岩;一些大、中型岩体都不是单一侵入体,而是许多中、小型岩块的集合体;在岩块内部从来未见到围岩捕虏体。从岩块的岩石化学分析结果看出,调查区内的镁铁质岩均属拉斑玄武岩系列,相当于蛇绿岩套中的堆积杂岩,是古洋脊或边缘海盆扩张脊的产物。据此可以断定,此混杂岩带所在的武当山—大悟山地体,具有增生楔的属性。

基于复杂网络理论的西藏巴宜区森林景观空间结构研究

西藏巴宜区降水量丰富,但地质灾害频发,森林生态系统的水源涵养功能取决于森林景观空间结构的优劣,这对于区域生态稳定至关重要。以西藏巴宜区为研究区,基于复杂网络理论和景观生态学分析方法识别并构建区域森林景观空间网络,并运用复杂网络特征指标及鲁棒性分析方法分析该森林景观空间网络的拓扑结构特征及抗破坏能力。结果表明:西藏巴宜区的森林景观空间网络度分布呈现幂律分布,具有无标度性特征,该网络具有非均匀特性,网络结构稳定性较差,且随机攻击下的边与节点恢复鲁棒性优于恶意攻击下的恢复鲁棒性。