聚二茂铁二甲基硅烷膜电化学过程的电化学石英晶体微天平研究

采用电化学石英晶体微天平(EQCM)测量了金电极表面上聚二茂铁二甲基硅烷(PFDMS)膜在水、甲醇、乙醇和丙酮等溶液中循环伏安(CV)过程中的质量变化.在PFDMS膜的氧化还原过程中伴有电解质阴离子向膜内扩散,进出聚合物膜的阴离子量与发生氧化还原的Fe的物质量相等,在水溶液中ClO-4离子是非水化的,进入聚合物膜的ClO-4离子不带水分子,在有机溶剂中ClO-4离子是溶剂化的,在甲醇和乙醇溶液中分别有1:1和1:0.5等摩尔量的溶剂分子随阴离子进出聚合物膜.     

对电化学中两个问题的讨论

讨论了Daniell电池的热力学可逆性问题和电化学反应的判据问题，认为Daniell电池是热力学不可逆电池，电化学反应的ΔrGm判据与E判据并不等价。     

电聚合烟酰胺构建新型亚硝酸盐电化学传感器

用循环伏安法电聚合烟酰胺（3-吡啶甲酰胺）,在玻碳电极上的制备了聚合物膜修饰电极,考察其对NO2^-及共存离子的作用情况,该修饰电极对NO2^-有良好的电化学催化作用和选择性,用差分脉冲伏安法（DPV）测定其氧化电流在N0f浓度1．68×10^-6mol／L~-1．76×10^-3 mol／L范围内呈线性关系,线性相关系数为0．999,检测限5．6×10^-7 mol／L。     

对苯二酚在玻碳电极上的电化学行为及其动力学研究

研究了对苯二酚（HQ）在玻碳电极上于磷酸盐缓冲液（PBS）中的电化学行为及其电化学动力学性质。结果表明：HQ在该电极上有一对可逆的氧化还原峰,峰电流与扫描速度的平方根（v1/2）呈良好的线性关系。这说明HQ在该电极上的伏安行为是一受扩散控制的可逆电化学过程。在pH为6.08的PBS缓冲液中氧化峰电流与HQ的浓度在5.0×10^-6-2.5×10^-5 mol/L范围内呈良好的线性关系,Ipa（μA）=-1.444-0.077 8 c（μmol/L）,相关系数r=0.996 5,检测限为4.75×10^-6 mol/L。同时利用电化学方法确定了该电极反应过程是双电子转移,并测得传递系数α为0.626,扩散系数D为7.4×10-7 cm^2/s,电极反应速率常数kf为6.8×10^-4 cm/s。     

Information sources and resources

Conclusion Counseling can help provide a meaningful frame of reference for career information. Computers and other technology offer an increasing variety of presentation methods, each having different impacts on individual clients. Counselors need to be knowledgeable about what information sources and resources are available. They also should be skillful in the use of information with clients who are operating along a continuum of developmental levels. The context of this information, the labor market, is constantly changing so counselors need to keep up to date in regard to career information resources and delivery services.Mary Elizabeth McCormac is Occupational Information System Specialist for National Occupational Information Coordinating Committee, 2100 M Street, N.W., Washington, D.C. 20037.     

Wilson and his sources

EXPERIMENTS ON MASS COMMUNICATION. By Carl I. Hovland, Arthur A. Lumsdaine, and Fred D. Sheffield. (Volume III of Studies in Social Psychology in World War II) Princeton: Princeton University Press, 1949; pp. x+345. $5.00.

SPEECH OF OUR TIME. Edited by Clive Sansom. London: Hinrichsen, 1948; pp. 228. $4.50.

AN INDEX TO ARISTOTLE. By Troy Wilson Organ. Princeton: Princeton University Press, 19.48; pp. vi+181. $5.00.

THE PREPARATION OF SERMONS. By A. W. Blackwood. New York and Nashville: Abingdon‐Cokesbury Press, 1948; pp. 272. $3.00.

PREACHING AND THE DRAMATIC ARTS. By E. Winston Jones. New York: The Macmillan Company, 1948; pp. ix +123. $2.00.

FEMALE PERSUASION. By Margaret Farrand Thorp. New Haven: Yale University Press, 1919; PP. 254. $3.75.

PLAIN WORDS. A Guide to the Use of English. By Sir Ernest Gowers. London: His Majesty's Stationery Office, 1948. Distributed by the British Information Service, New York; pp. 94. $1.15.

THE ART OF ACTING. By John Dolman. New York: Harper and Brothers, 1919; pp. xx+313. $3.50.

BUILDING A CHARACTER. By Constantin Stanislavski. New York: Theatre Arts Books, 1049; pp. xx+292. $3.50.

FROM NATIVE ROOTS. By Felix Sper. Caldwell, Idaho: The Caxton Printers, 1948; pp. 341. $4.00.

TWENTY‐FIVE BEST PLAYS OF THE MODERN AMERICAN THEATRE. Edited with an Introduction by John Gassner. New York: Crown Publishers, 1949; pp. xxvii+756. $5.00.

A MANUAL OF PRONUNCIATION. By Morriss H. Needleman. New York: Barnes and Noble, 1949; pp. cxxiii+323. $4.00.

PORTUGUESE‐AMERICAN SPEECH. An outline of Speech Conditions Among Portuguese Immigrants in New England and Elsewhere in the United States. By Leo Pap. New York: King's Crown Press, 1949; pp. xi+223. $3.00.

A MINIATURE TEXTBOOK OF FEEBLEMINDEDNESS. By Leo Kanner, M.D. Child Care Monographs, No. 1. New York: Child Care Publications, 1949; pp. 33. $1.25.

FUNDAMENTALS OF WRITING FOR RADIO. Drama, Talks, Continuities, and Non‐dramatic Features with Guidance in Program Planning, Production, and Marketing. By Rome Cowgill. New York: Rinehart and Company, 1949; pp. vi + 295. $3.50.

SPEECH METHODS IN THE ELEMENTARY SCHOOL. By Carrie Rasmussen. New York: The Ronald Press Company, 1919; pp. ix + 340. $3.50.

HOW TO SPEAK THE WRITTEN WORD. A Guide to Effective Public Reading. By Nedra Newkirk Lamar. New York: Fleming H. Revell Company, 1949; pp. 175. $2.50.

VOICE AND DICTION. By Victor A. Fields and James F. Bender. New York: The Macmillan Company, 1949; pp. viii+368. $4.00.

PRACTICAL DEBATING. By Luther W. Courtney and Glenn R. Capp. New York: J. B. Lippincott Company, 1949; pp. viii+308. $3.25.

YOU AND YOUR SPEECHES. By E. C. Buehler. Lawrence, Kansas: The Allen Press, 1949; pp. 226. $3.00.

38 BASIC SPEECH EXPERIENCES. A Guide for Student and Teacher. By Clark S. Carlile. St. Louis: John S. Swift Company, 1949; pp. xvi+153.     

英语习语渊源漫谈

英语民族历史悠远 ,语言丰富 ,而其中英语习语之浩瀚足以使从事英语研究与教学者对其无法回避。文章从英语习语的历史、地域、民俗、宗教、人文及民族心理等方面阐述英语习语的变迁 ,旨在唤起人们对习语在跨文化交际中重要作用的重视以及对跨文化教学意识的提高     

Electrochemical Oscillations Induced by Surfactants

HeZhanbopointedout[1] thatsurfactantscanbeusedtomakenewchemicaloscillatorsinaqueoussolution ,suchasbromateoscillator[2 ] andpermanganateoscillator[3] .Untilnow ,however,thereisnotanyelectrochemicaloscillatorre latedwithsurfactant.　　Anelectrochemicaloscillatorisoneofthefirstdisco veriesofchemicaloscillators .Todayhundredsofarticleshavebeenpublished[4— 6 ] aboutelectrochemicaloscillators.Theyprovidematerialstoenrichmaturetheoriesandmecha nisms[7— 8] .InourexperimentsweusedaDaniellcellasele…