Theoretical calculation of Flory-Huggins and scattering interaction parameters by means of the lattice fluid theory for PVME/PSD blends

By fitting the spinodals of poly(vinyl methyl ether)/deuterated polystyrene (PVME/PSD) systems, the adjustable parameters epsilon (12)* and delta epsilon* in the Sanchez-Balasz lattice fluid (SBLF) theory could be determined for different molecular weights. According to these parameters, Flory-Huggins and scattering interaction parameters were calculated for PVME/PSD with different molecular weights by means of the SELF theory. From our calculation, Flory-Huggins and scattering interaction parameters are both Linearly dependent on the reciprocal of the temperature, and almost linearly on the concentration of PSD. Compared with the scattering interaction parameters, the Flory-Huggins interaction parameters decreased more slowly with an increase in the concentration for all three series of blends.

Synthesis and properties of Ru(phen)(2)(phen-NHCOCH2Br)(PF6)(2)

A new active material for ECL sensor. Ru(phen)(2)(phen-NHCH2Br)(PP6)(2). has been designed and synthesized. Its structure was confirmed by means of IR. MS and H-1 NMR. Also. some of its properties such as electrochemistry, fluorescence and ECL are reported.

High resolution solid-state NMR and DSC study of poly(ethylene glycol) silicate hybrid materials via sol-gel process

Hybrid materials incorporating poly(ethylene glycol) (PEG) with tetraethoxysilane (TEOS) via a sol-gel process were studied for a wide range of compositions of PEG by DSC and high resolution solid-state C-13- and Si-29-NMR spectroscopy. The results indicate that the microstructure of the hybrid materials and the crystallization behavior of PEG in hybrids strongly depend on the relative content of PEG. With an increasing content of PEG, the microstructure of hybrid materials changes a lot, from intimate mixing to macrophase separation. It is found that the glass transition temperatures (T-g) (around 373 K) of PEG homogeneously embedded in a silica network are much higher than that (about 223 K) of pure PEG and also much higher in melting temperatures T-m (around 323 K) than PEG crystallites in heterogeneous hybrids. Meanwhile, the lower the PEG content, the more perfect the silica network, and the higher the T-g of PEG embedded in hybrids. An extended-chain structure of PEG was supposed to be responsible for the unusually high T-g of PEG. Homogeneous PEG-TEOS hybrids on a molecular level can be obtained provided that the PEG. content in the hybrids is less than 30% by weight. (C) 1998 John Wiley & Sons, Inc.

催化荧光法测定痕量亚硝酸根

本文研究了在稀磷酸介质中,亚硝酸根对溴酸钾氧化中性红的反应,建立了催化荧光法测定痕量亚硝酸根的方法.实验表明,亚硝酸根在0.05—0.40μg·25ml~(-1)范围内与△F成线性关系,大多数常见的共存离子不影响其测定.本法用于水样中亚硝酸根的测定,结果比较满意.

IN-SITU SCANNING TUNNELING MICROSCOPIC STUDY OF NICKEL ELECTRODEPOSITION ON HOPG

The early stages of the electrodeposition of nickel on highly oriented pyrolytic graphite (HOPG) were investigated by in situ scanning tunnelling microscopy, scanning electron microscopy and electrochemical measurements. Experimental results showed that t

RE_(1-x)B_xF_(3-y)(RE=Y、La、Ce、Gd;B=Ca、Ba)的敏感性质的研究

LaF_3作为离子选择性电极和对气体的敏感性质已进行了一定的研究,但其他稀土氟化物的敏感性质却未见报道。本文合成了RE_(1-x)B_xF_(3-y),研究了它们的结构、电学性质及敏感性质,得到有可能在150℃使用的固体电解质氧敏材料。 (一) RE_(1-x)B_xF_(3-y)的结构分析 结构分析表明,Ca、Ba置换RE的含量少时,如La_(0.95)Ba_(0.05)F_(3-y)、Ce_(0.95)Ca_(0.05)F_(3-y)的X射线衍射分析结果与LaF_3、CeF_3相似,说明它们是固溶体。而Ca置换RE含量较多时,如Y_(0.71)Ca_(0.29)F_(3-y)、Gd_(0.85)Ca_(0.15)F_(3-主)的X射线衍射分析结果却与相应的YF_3和GdF_3完全不

Ship-board measurements and estimations of air-sea fluxes in the western tropical Pacific during TOGA COARE

Direct air-sea flux measurements were made on RN Kexue #1 at 40 degrees S, 156 degrees E during the Tropical Ocean Global Atmosphere (TOGA) Coupled Ocean-Atmospheric Response Experiment (COARE) Intensive Observation Period (IOP). An array of six accelerometers was used to measure the motion of the anchored ship, and a sonic anemometer and Lyman-alpha hygrometer were used to measure the turbulent wind vector and specific humidity. The contamination of the turbulent wind components by ship motion was largely removed by an improvement of a procedure due to Shao based on the acceleration signals. The scheme of the wind correction for ship motion is briefly outlined. Results are presented from data for the best wind direction relative to the ship to minimize flow distortion effects. Both the time series and the power spectra of the sonic-measured wind components show swell-induced ship motion contamination, which is largely removed by the accelerometer correction scheme, There was less contamination in the longitudinal wind component than in the vertical and transverse components. The spectral characteristics of the surface-layer turbulence properties are compared with those from previous land and ocean results, Momentum and latent heat fluxes were calculated by eddy correlation and compared to those estimated by the inertial dissipation method and the TOGA COARE bulk formula. The estimations of wind stress determined by eddy correlation are smaller than those from the TOGA COARE bulk formula, especially for higher wind speeds, while those from the bulk formula and inertial dissipation technique are generally in agreement. The estimations of latent heal flux from the three different methods are in reasonable agreement. The effect of the correction for ship motion on latent heat fluxes is not as large as on momentum fluxes.

SUSPENDED SEDIMENT TRANSPORT IN THE OFFSHORE NEAR YANGTZE ESTUARY

Based on the Estuarine, Coastal and Ocean Modeling System with Sediments (ECOMSED) model, a 3-D hydrodynamic-transport numerical model was established for the offshore area near the Yangtze Estuary in the East China Sea. The hydrodynamic module was driven by tide and wind. Sediment module included sediment resuspension, transport and deposition of cohesive and non-cohesive sediment. The settling of cohesive sediment in the water column was modeled as a function of aggregation (flocculation) and deposition. The numerical results were compared with observation data for August, 2006. It shows that the sediment concentration reduces gradually from the seashore to the offshore area. Numerical results of concentration time series in the observation stations show two peaks and two valleys, according with the observation data. It is mainly affected by tidal current. The suspended sediment concentration is related to the tidal current during a tidal cycle, and the maximum concentration appears 1 h-4 h after the current maximum velocity has reached.

冲绳海槽深部热场结构的地球动力学热模拟

本文搜集了我国东海及琉球沟弧盆系15个航次373个热流数据，并按其精度进行了初步的整理分类，发现这一区域的热流呈现出东西分带南北分块的分布格局，和这一区域的构造格局有着明显的对应关系。琉球海沟地区有着极低热流值，这和板块下插冷却模型相一致，冲绳海槽区出现了巨高热流值，而且数值变化很大，这和弧后盆地的拉张形成及其热液活动有关。

The Apertospathulidae, a new family of haptorid ciliates (Protozoa, Ciliophora)

We studied the morphology of three rare haptorid ciliates, using live observation and silver impregnation: Apertospathula verruculifera n. sp., Longispatha elegans n. gen., n. sp., and Rhinothrix porculus (Penard, 1922) n. gen., n. comb. Simple ethanol fixation (50-70%, v/v) is recommended to reveal the ciliary pattern of "difficult" ciliates, such as R. porculus, by protargol impregnation. The three genera investigated have a distinct feature in common, viz., a lasso-shaped oral bulge and circumoral kinety, where the right half is slightly to distinctly longer than the left and the circumoral kinety is open ventrally. Thus, they are united in a new spathidiid family, the Apertospathulidae n. fam., which probably evolved from a Bryophyllum-like ancestor by partial reduction of the oral bulge and circumoral kinety. Apertospathula verruculifera has a wart-like process, the palpus dorsalis, at the anterior end of the dorsal brush. The right branch of the circumoral kinety is only slightly longer than the left one. Longispatha elegans has a straight oral bulge and circumoral kinety, the right branch of which extends to the posterior end of the body while the left branch ends in the anterior third of the body. Rhinothrix porculus, a curious ciliate with a snout-like dorsal elongation of the oral bulge, the palpus oralis, has a highly characteristic ciliary pattern: the oral pattern is as in Longispatha, but the bulge and circumoral kinety extend spirally to the posterior end of the body while the somatic kinetics course meridionally. This is achieved by inserting some shortened kinetics in the curves of the oral bulge.

普氏原羚的分布和种群数量调查

2003年8～9月,对青海省境内普氏原羚的分布和种群数量进行了专项调查.调查结果表明,普氏原羚现存7个种群,累计数量为602只;其中塔勒旋果种群属首次报道.与以往报道相比,目前元者和鸟岛种群数量呈下降趋势;海晏-刚察种群数量增长明显;湖东-克图种群数量有所回升,但仍没有达到20世纪80年代中期时的种群数量.普氏原羚种群数量变化与栖息地质量及人为干扰程度有密切相关.本次调查显示,普氏原羚现存栖息地呈不连续的间断分布,随着区域经济开发力度的加大,其栖息地在不断缩减、生存环境质量仍在继续恶化.

藏药麻花艽愈伤组织的诱导及植株再生

1植物名称麻花艽(Gentiana straminea Maxim.),又名麻花秦艽,藏药中称为"解吉嘎保".2材料类别幼嫩叶子.3培养条件愈伤组织诱导培养基:(1)MS+2,4-D3.0 mg•L-1(单位下同);(2)MS+2,4-D 3.0+KT 1.0.继代培养基:(3)MS+2,4-D 1.0+6-BA 0.5+NAA 0.5.分化培养基:(4)MS+NAA 1.0+6-BA 2.0+ZT 3.0.以上培养基均附加CH(水解酪蛋白)300、肌醇200、3%蔗糖、5 g•L-1琼脂粉,pH 5.8.培养温度为(25±1)℃,光源为日光灯,光强为30～60μmol•m-2•s-1,光照时间12 h•d-1.

禾本科叶片表皮结构细胞的组合式样及其分类学意义

利用光学显微镜，对禾本科204属373种植物的叶片表皮进行了观察。发现禾本科叶片表皮细胸细胞在下表面上的分布式样可以划分为5个基本类型，即竹型、稻型、黍型、虎尾草型和早熟禾型，而5个基本类型所附属的植物类群分别是禾本科中的竹亚科、稻亚科、虎尾草亚科早熟禾亚科。同时分析了这5个类型的演化水平，并同类群的外部形态、地理分布相印证，表明竹亚科最原始、稻亚科次之、黍亚科演化居中、虎尾草亚科较高级、早熟禾亚科最高级；禾本科可能起源于世界的热带区域。