会计档案管理浅谈

<正>会计档案是机关、团体和企事业单位财会部门在核算和监督经济业务活动中形成并按一定规律集中保存备查的原始会计核算文件材料。它是记录和反映经济活动的重要史料和证据,具有严格的数据平衡性、时序性和严肃性,是国家档案的重要组成部分。

岷江上游干旱河谷农林边界影响域的研究

对岷江上游农林边界的影响域进行研究 ,以提高该区管理农田和林地的水平 .共调查 3种类型农林边界 10条样带 ,采用移动窗口法对植物多样性的数据进行分析 ,结果表明 ,当窗口宽度达到 6～ 10时 ,SED曲线的变化趋向稳定 ,并且在曲线上有一或两个峰值出现 .不同类型边界的影响域是不同的 ,但均在距边界 5 0m内 .各类型边界的影响域多在 12～ 30m之间 .6条林地样带只有M 2和M6样带林地的影响域被确定 ,而 4条农田样带的影响域均被确定 .影响域的大小取决于边界两侧斑块类型和地形以及小气候等因子 ,但坡向对其影响不大 ;移动窗口法能有效地刻画边界动态 ,是一种分析边界简单而有力的工具 .这些结果有利于进一步理解干旱河谷区农林间的相互作用 .

无线多跳网中具有网络编码意识的机会路由协议

针对现有COPE协议消极编码的问题,提出一种具有网络编码意识的机会路由协议NCAOR。该协议兼取机会路由和网络编码的优势实现高效地报文投递。在每一跳转发时,节点均选取多个冗余邻居节点构成机会节点集协助数据发送。收到报文后,机会节点利用局部拓扑知识和侦听的邻居报文接收信息判断转发报文的网络编码机会,并通过综合路径距离和编码收益的效用函数评估报文转发效能,智能设置转发响应时间。仿真结果表明,该协议相对采用最短路径路由的COPE方案具有网络吞吐量大、能耗低和节点编码机会更多的优点。

Rapid label-free detection of metal-induced Alzheimer's amyloid beta peptide aggregation by electrochemical method

Amyloid beta peptide plays a critical role in the pathogenesis of Alzheimer's disease (AD). Metal ions are highly enriched in cerebral amyloid deposits in AD and are proposed to be able to mediate A beta conformation. Therefore, a rapid, low-cost, and sensitive detection of metal-induced A beta aggregation and their relation to AD is clearly needed for the clinical diagnosis and treatment. In this report, we study metal-induced A beta aggregation by a rapid, label-free electrochemical method and monitor both the aggregation kinetics and the morphology in the absence or presence of Zn (II) and Cu (II).

A Facile and Practical One-Pot Synthesis of beta-Oxo Thioamides from beta-Oxo Amides and Isothiocyanates

A facile and practical one-pot synthesis of beta-oxo thioamides from beta-oxo amides has been developed. By treatment with isothiocyanates in ethanol in the presence of potassium carbonate, a series of beta-oxo amides was converted, under reflux, in high yields into the corresponding beta-oxo thioamides.

Growth of highly crystalline CaMoO4 : Tb3+ phosphor layers on spherical SiO2 particles via sol-gel process: Structural characterization and luminescent properties

Highly crystalline CaMoO4:Tb3+ phosphor layers were grown on monodisperse SiO2 particles through a simple sol-gel method, resulting in formation of core-shell structured SiO2@CaMoO4:Tb3+ submicrospheres. The resulting SiO2@CaMoO4: Tb3+ core-shell particles were fully characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectra (EDS), transmission electron microscopy (TEM), photoluminescence (PL), low-voltage cathodoluminescence (CL), and kinetic decays. The XRD results demonstrate that the CaMoO4:Tb3+ layers begin to crystallize on the SiO2 spheres after annealing at 400 degrees C and the crystallinity increases with raising the annealing temperature. SEM and TEM analysis indicates that the obtained submicrospheres have a uniform size distribution and obvious core-shell structure. SiO2@CaMoO4:Tb3+ submicrospheres show strong green emission under short ultraviolet (260 nm) and low-voltage electron beam (1-3 kV) excitation, and the emission spectra are dominated by a D-5(4) -F-7(5) transition of Tb3+(544 nm, green) from the CaMoO4:Tb3+ shells.

Synthesis and crystal structure of [Nd(eta(6)-1,3,5-C6H3Me3)(AlCl4)(3)]( C6H6) and structural comparison of Ln(eta(6)-arene)(AlCl4)(3)

Reaction of NdCl3, with AlCl3 and mesitylene in benzene gives complex [Nd(eta (6)-1,3,5-C6H3Me3) (AlCl4)(3)] (C6H6) (1) which was characterized by elemental analysis, IR spectra, MS and X-lay diffractions. The X-ray determination indicates that 1 has a distorted pentagonal bipyramidal geometry and crystallizes in the monoclinic, space group P2(1)/n with a = 0.9586(2), b = 1.1717(5), c = 2.8966(7) nm, beta = 90.85 (2)degrees, V = 3.2529(6) nm(3), D-c = 1.573 g/cm(3), Z = 4. A comparison of bond parameters for all the reported Ln(eta (6)-Ar) (AlCl4)(3) complexes indicates that the bond distance of Ln-C is shortened with the increasing of methyl group on benzene and with the decreasing of radius of lanthanide ions.

Structure of hydrated dysprosium picolinate, [Dy(C5H4NCO2)(3)(H2O)(2)]2.8H(2)O

The crystal structure of the title compound was determined by X-ray diffraction. The dysprosium ion is eight-coordinated by three oxygen atoms and three nitrogen atoms from three picolinato ions and two water oxygen atoms. The nitrogen atom and one carboxyl oxygen atom of each picolinato ion are coordinated to the same dysprosium ion to form a five-membered chelating ring. The title compound exists as discrete molecules in the crystal structure.

EFFECT OF IRRADIATION ON CRYSTALLINITY AND MECHANICAL-PROPERTIES OF ULTRAHIGH MOLECULAR-WEIGHT POLYETHYLENE

Ultrahigh molecular weight polyethylene (UHMWPE) has been irradiated (0-40 Mrad) with a Co-60 source at room temperature under vacuum. The crystallinity has been investigated by differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS). The mechanical properties have been determined at room temperature. A significant increase of heat of fusion can be seen at low irradiation doses, which is attributed to crystallization, caused by chain scission during the process of irradiation. It is also observed that the thickness of the lamellae changes with irradiation dose. The Young's modulus has been improved significantly after irradiation at low doses. (C) 1993 John Wiley & Sons, Inc.

Effects of single and mixed diatom diets on the reproduction of copepod Calanus sinicus

Under laboratory conditions, the potential influence of diatom diets on reproduction of zoo-plankton Calanus sinicus was studied. Four diatom diet ingredients: Skeletonema costatum (SC), Chaetoceros muelleri (CM), Phaeodactylum tricornutum (PT), diatom mixture (MIX) and a control diet: the flagellate Platymonas subordiformis (PS), were used at the same carbon concentrations of 2.0 mu g mL(-1) C. In a period of 17-day laboratory experiment, the effects of these algae diets on egg production and hatching success of the copepod Calanus sinicus were examined. The diets were analyzed for fatty acid content as an indicator of food quality. The results showed that the female survival of all treatments reached more than 80% except PT. Comparing to the initial value, egg production of Calanus sinicus was reduced in diatom diets (PT, CM), but remained in normal level in SC and MIX, indicating that some single diatom diets had a negative effect on the egg production of Calanus sinicus. Feeding with mixed food however can eliminate this negative effect. Among all the treatments, hatching success in filtered seawater was significantly higher than in algal exudates, indicating that not only diatoms but also other phytoplankton in certain concentration can release extracelluar substance that may inhibit eggs from hatching. Fatty acid analysis showed that both egg production rate and hatching success were negatively correlated to the ratio of 20:5 omega 3 and 14:0 in fatty acid composition.

由多个8031组成的锥体结构计算机

本文介绍了一种新型的并行计算机结构。这种结构是由21个8031单片机组成的.它特别适合于图像处理和模式识别.文中描述了该结构的原理,分析了它的特点,并举出几种算法的例子。

月球表面温度物理模型研究现状

总结了前人对月球表面温度的研究方法,对他们的研究进行了归类,分析了它们各自的优劣。直接测量和基于绕月飞行器的遥感测量均需投入昂贵的发射和维护费用,基于探测数据或月球样品分析数据的研究局限于某些时间段和地点,地基遥感探测的空间分辨率太低,这些方法自身的局限限制它们不可能用于全月的温度变化研究,只有通过建立比较完善的月球表面温度物理模型才可能达到这一目的。重点对月球表面温度物理模型进行讨论,分析了已有的模型,总结了影响月球表面温度的影响因素,包括月球表面太阳辐射、月球内部热流、月球表面物质的热吸收率、发射率、热导率、热容以及密度等,对这些因素的研究现状进行了概括,并提出了进一步研究这些参数的一些想法。