塞曼火焰原子吸收法测定黄河水体的总硬度

采用原子吸收分光光度法测定黄河水体的总硬度,钙的浓度在0.100～5.00 mg/L、镁的浓度在0.0500～2.00 mg/L范围内分别与吸光度呈线性关系,线性方程分别为A=0.045 5c+8.354×10~(-5)、A=0.514c+8.354×10~(-5),相关系数均为0.9999。黄河水样6次测定结果的相对标准偏差为1.2％,t检验结果表明,该法与EDTA络合滴定法测定结果无显著性差异。     

SIMULATION MODELLING OF THE IMPACTS OF SEA-LEVEL RISE SINCE THE LATEGLA-CIAL PERIOD ON THE CHANGJIANG(YANGTZE) RIVER, CHINA

Dramatic water stage rise and channel aggradation in the middle and lower reaches of the Changjiang (Yangtze) River have been recognized by previous studies. A further analysis of the data from geological, geomorphological, and paleohydrological surveys suggests that these changes might have resulted from sea-level rise since the Lateglacial period. So a mathematical model has been developed here, which reconstructs the processes of water-stage rise and channel aggradation of the Changjiang River as responses to sea-level rise since 12,100 a B.P.     

α-蒎烯等离子体聚合及其聚合物结构研究

本文应用外部电容耦合式聚合装置,研究了α—蒎烯等离子体聚合规律。通过元素分析,裂解色谱-质谱、红外光谱和接触角测定等方法测定了聚合物的结构和性能。     

STUDY ON THE MOISTURE PASSAGE ON THE LOWER REACHES OF THE YARLUNG ZANGBO RIVER

A series of gorges on the lower reaches of the Yarlung Zangbo River is like an enormous crevice splitting the southeastern Qinghai-Xizang (Tibet)Plateau to create a passage through which warm, wet air flow from the Indian Ocean reaches the inner part of the plateau. This moisture passage was mainly strengthened after the Pleistocene epoch in the Quaternary period and has played a major role in affecting the beginning date of the rainy season and the amount of the plateau's rainfall. It has also served as a corridor for the living things on the southern and the northern sides of the Himalayas to mingle with each other. The region along this passage is abundant in evidences of species of differentiation, variation and biological division. Also the passage has provided a favorable environment for human beings and affected natural phenomena there.     

电解液浓度对氢化物电极性能的影响

镍/氢化物(Ni/MH)电池以其洁净、安全、高容量、大功率、长寿命而受到人们的极大关注。贮氢电极材料的研究是开发Ni/MH电池的中心,已有较多报道。Boonstra等研究了氧化、粉末的处理等对LaNi_5电极性能的影响。本文探讨电解液浓度对MLNi_(3.5)MnCO_(0.4)Al_(0.1)(ML代表富镧混合稀土)电极放电性能的影响,并对其循环伏安性能进行了研究。 贮氢合金是在氩气保护下,将计量比的各组成元素ML、Ni、Mn、Co、Al混合物在高频感应     

THE EFFECT OF MIXED MICELLES OF SURFACTANTS ON THE ALKALINE HYDROLYSIS OF ESTERS

The alkaline hydrolysis of aromatic and normal aliphatic acid esters have been studied at 25°C In mixed micellar solution of surfactants (Brij35—SDS, Brij35 — DTAB, Brij35—TTAB.Brij35-CTAB. Triton X—100 —CTAB, Triton X— 100 —SDS) with UV spectrophotometry and the method of thermokinetics The critical mice liar concentrations of the corresponding systems have also been measured with UV spectrophotometry in this paper. K_jnln micellar pseudo-phase has been calculated- The ratios of ki.to ki.for all mixed micellar systems Investigated are less than 1. The results indicate that these reactions are inhibited by the mixed micelles and the mixed micelles exhibit a greater effect of Inhibition on the reactions than those do In corresponding single ones. The reason for this is that the micropolarity of the compact Stern layer of mixed micelle is lower, and the micro viscidity Is higher. The Inhibition effect! also depend on the hydrophobic chain length of the surfactants and the hydrophobicity of the substrate.     

火焰原子吸收光谱法测定南湖菱中矿质元素

用火焰原子吸收光谱法测定嘉兴南湖菱中钾、钠、钙、镁、铁、铜、锌、锰、镉、铅金属元素的含量。结果表明，南湖菱中有较高的矿物质营养价值，有害元素的含量低于国家食品允许标准。     

离子分子反应装置的建立及应用

本文报导离子分子反应装置的建成并测量了O~++N_2反应的速率常数k.O~+离子由微波放电和电极电离产生,经快速流动,用四极质谱仪检测到.中性分子N_2经支管进入流动管,并与O~+离子反应,在温度为298 K 时,测得该反应速率常数为k=(2.50±0.52)×10~(-12)cm~3·molec~(-1)·s~(-1)(T=298 K)     

A STUDY OF THE POLYMERIZATION MECHANISM OF ACETONITRILE IN GLOW DISCHARGE

Plasma polymerization of acetonitrile was carried out by a capacitively coupled RF plasma apparatus with external electrodes under some different reaction conditions such as discharge power. By investigating the informations provided by the polymer deposition regularities, IR spectra and elementary analysis results, the polymerization mechanism of acetonitrile in glow discharge have been investigated. The results show that acetonitrile polymerized in glow discharge mainly through hydrogen detachment for initiation at lower energy levels and the role that opening C≡N triple bond played in polymerization became more important at higher energy levels.     

ELECTROSTATIC EFFECTS IN THE PHOTOREDUCTION OF FLAVINS BY EDTA

The anaerobic photoreduction of riboflavin, flavin mononucleotide, N(3)-carboxymethylriboflavin, N(3)-methyl-lumiflavin, and lumiflavin by EDTA was studied in aqueous solution over the pH range 2.5–10. The electrostatic effects of the electron donor-acceptor pair produce a secondary effect on the reactivity, and this effect can be predicted from the product of the charges (Z_D x Z_A). The trianonic and tetraanonic species of EDTA have nitrogens which are free from intramolecular hydrogen bonding, and these species are potentially the most reactive. However, in some pH regions the electrostatic effect can become the dominant factor when both the electron donor and acceptor become negatively charged. The excited states of flavins are susceptible to charge effects whether the charge is localized on the side chain or involves the isoalloxazine ring system.     

红外及相关技术在盐湖化学中的应用

在硼酸盐化学、盐湖材料化学及成盐元素化学研究中，由于红外及相关联用技术的应用而取得了很大进展。此文对近年来我国在盐湖化学研究工作中应用红外及相关联用技术的工作进行了综述，对红外新技术在盐湖化学中的应用前景进行了展望。共引用文献65篇。     

H2SO4溶液中F-离子对Pb及Pb-Sb电极表面膜影响的研究

Pb-Sb板栅的耐腐蚀性能是影响铅蓄电池寿命的重要原因之一。关于不同Pb合金电极的研究已有不少工作。关于H₂SO₄溶液中添加剂的研究,除H₃PO₄以外,其它一些添加剂的研究不多。鉴于F^-离子的特殊性,我们研究了电解液中F^-离子对Pb、Pb-Sb电极的影响。     

六氟丙烯的等离子体聚合和聚合物结构的研究

应用外部电容耦合式聚合装置,研究了六氟丙烯(HFP)的聚合规律,找到了较好的聚合条件。实验中发现在聚合过程中,随功率增加脱氢作用增大,这可利用氢等离子气体加以控制。X-射线衍射法和元素分析结果表明,在辉光区中形成的PHFP具有高度支化和交联的结构。从性能研究中看出,等离子体PHFP膜具有较好的光学性能,疏水性和较高的热稳定性。     

MlNi4Al和MlNi4Mn贮氢电极性能的研究

ＭｌＮｉ４Ａｌ和ＭｌＮｉ４Ｍｎ贮氢电极性能的研究＊赵东江马松艳（绥化师专化学系绥化１５２０６１）关键词贮氢电极循环寿命自放电中图分类号Ｏ６４６．５４镍／氢化物（Ｎｉ／ＭＨ）二次电池以其洁净、安全、高容量、大功率及长寿命等特点受到极大关注。贮氢电极材料...     

ELECTRIC REGENERATION METHOD OF IONEXCHANGE RESIN IN THE MIXED BED

1.INTRODUCTIONThemixedbedofionexchangeisanecessnywatertreatmentunitfortheProduchonofpurewaterandsuperpurewaterinelectricindustryandthermalpowerplant.Ingeneral,inthemixedbed,theionexchangeresinsconsistofthestronglyacidicionexchangeresininfree-acidformandstronglybasicionexchangeresininfree-baseform.TheexhaustedresinswillberegeneratedbyusingthestrongacidandstrongalkalirespechvelyThiskindofregenerationmethodwithacidandalkalihasfollowingdefectsf1.TheutilizationefficiencyofregenerantSisvarylow…     

THE EFFECT OF SURFACTANT MICELLES ON THE ALKALINE HYDROLYSIS OF DIMETHYLFORMAMIDE

The alkaline hydrolysis of dimethylformamide has been studied at 40'C in micellar solutions of single surfactant (CTAB. SDS. Brij 35) with the analog thermoanalytical curve method of thermokinetics. A kinetic equation of micellar catalysis under the condition of highter reactant concentration than micellar concentration ([S]>[M]) has been derived from the pseudophase model of micellar catalysis and some relative assumptions, The kinetic parameters. k_m, k_2mand the association constant of reactant with micelle K₁, have been calculated in this way. the results indicate that these surfactant micelles exhibit catalytic effect on the reaction. This is attributed to the micropolarity and local concentration effect of micelles.     

碘甲烷在碳酸二甲酯直接合成中的作用

Dimethyl carbonate (DMC) is an environmentally friendly compound and a substitutive intermediate for highly toxic phosgene or dimethyl sulfate in carbonylation and methylation reactions as well as a promising octane booster. The common methods for its preparation are the oxidative carbonylation of methanol catalyzed by a variety of transition metal ions and the transesterification of ethylene carbonate or propene carbonate with methanol[1]. The direct synthesis of DMC from carbon dioxide and methanol is a challenging route in which the most abundant carbon resources and a main greenhouse gas is used as feedstock. A new method for the direct synthesis of DMC catalyzed by the methoxide of main group metal has attracted more and more attention since it was reported[2～6] . However the lower conversion of the reaction has become the main obstacle for its application. In this letter, an efficient promoter for the direct synthesis of DMC is reported.     

Monte Carlo方法模拟胶体沉降过程中粒子半径的影响

运用Ｍｏｎｔｅ Ｃａｒｌｏ方法模拟了粒子在重力场中扩散控制的沉降过程，获得了不同粒径下的沉降图样，并用分维进行了分析。结果表明，随着粒子半径的增大，沉降图样堆积得越来越紧密，当粒径小于４３０ｎｍ时，分维数随粒径的增大迅速增大；大于４３０ｎｍ时，分维数增长缓慢，最后趋近于２。     

O(3P)原子与3-戊酮反应速率常数与温度关系的测定

由于燃烧机理和大气化学过程研究的需要,人们对有机化合物分子,如烷烃、烯烃及其衍生物与一些自由基,如O、OH和卤素原子的反应速率常数进行了广泛的测定。但酮类分子与这些自由基的研究则报道得很少,尽管人们早已发现酮类化合物是碳氢化合物被NO_x光氧化过程中产生的中间化合物。就我们所知,除有少量的关于O(~3P))原子与酮类分子反应速率常数测定的文献报道外,我们在前文中报道了用流动微波放电——化学发光方法测