MIGRAT: A COMPUTER-ASSISTED INSTRUCTIONAL PROGRAM FOR THE SIMULATION OF MIGRATION

Primary individuals and the households that they head now compose a significant proportion of US households. This paper examines the regional and intraurban distribution of primary households. Macro-scale data from the 1960 and 1970 Censuses are used to examine the evolving regional patterns of primary individuals and households. Using intraurban data for the 1970's, the paper also examines the impact of recent rapid growth in the number of primary individuals on the spatial distribution of primary households within urban areas. Inferences are drawn with respect to the macro- and micro-scale distributions of primary individuals and households and the impact of continued growth of this subpopulation on urban form and population distribution.     

SHORT COMMUNICATION SOL1:A PROGRAM FOR THE SIMULATION OF COMPLEX EQUILIBRIA USING A PERSONAL COMPUTER

The program SOL1,written in Turbo-PASCAL for use on a personal computers(IBM-PC orcompatible),has been developed for calculating the equilibrium concentrations of the species inmulticomponent ligand-metal mixtures of up to 21 components and 150 species.The main features arethe easy data input system,the possibility of three different tasks(calculating the composition of a singlesolution,simulating titration curves and calculating the species distribution as a function of pH)andprocedures for drawing the calculated curves on Roland DXY plotters.The program has been tested by astudy of six different complex systems.     

A PUBLIC INFORMATION PROGRAM FOR THE ASSOCIATION OF AMERICAN GEOGRAPHERS

Advances in Earth Science. P. M. Hurley (ed.).

Climates of the World aed their Agricultural Potentialities. J(uan) Papadakis.

Rebuilding Cities. Percy Johnson Marshall.

The Alliance for Progress: Key t o Latin America's Development. J. Warren Nystrom and Nathan A. Haverstock.

Market Potential and Economic Shadow. D. Michael Ray.

Soils, An Introduction to Soils and Plant Growth. Roy L. Donahue.

Guide to Russian Reference Books: Volume 11: History, Historical Sciences, Ethnography, Geography. Karol Maichel, (ed.) J. S. G. Simmons.

Middle America: Its Lands and Peoples. Robert C. West and John P. Augelli.

California's Many Climates. Ernest L. Felton.

The Soviet Union, People and Regions. David Hooson.

Planning in the Soviet Union. Philippe J. Bernard. Translated by I. Nove.

Human Nature in Geography. John K. Wright.

Military Geography. Louis C. Peltier and G. Etzel Pearcy.

The Philififiines: Nation of Islands. Alden Cutshall.

The Journals Of ZebuLon Montgomery Pibe with Letters and Related Documents. Donald Jackson (ed.).

The Sabi Valley Irrigation Projects. Wolf Roder.

How to Identify Old Maps and Globes. Raymond Lister.

The Seigneurial System in Early Canada: A Geographical Study. Richard Colebrook Harris.

North Atlantic Arena: Water Transport in the World Order. Charles C. Colby.

Continental Drift. G. B. Garland (ed.).

Land Use in Sudan. J. H. G. Lebon.

Uboma: A Socio-Economic and Nutritional Suruey of a Rural Community in Eastern Nigeria. H. A. Oluwasanmi, I. S. Dema, and others.

City and Region. R. E. Dickinson.

An Introduction to Geography. Rhoads Murphey.

A Reporter in Micronesia. Ely Jacques Kahn

Committee on Interior and Insular Affairs, House of Representatives Water Management and Floods in the Fraser River Basin. W. R. Derrick Sewell.

Human Geografihy. Aime Vincent Perpillou (Tr. by E. D. Laborde).

Dictionary of Geography. Dudley Stamp (ed.).

The Roman City of London. Ralph Merrifield.

Land Behind Baghdad. Robert McC. Adams.

The Evolution of Urban Society: Early Mesopotamia and Prehispanic Mexico. Robert McC. Adams.

A Preface to Economic Geography. Harold H. McCarty and James B. Lindberg.

Scandinauian Lands, Roy Millward.

The Great American Desert. W. Eugene Hollon.

City and Regional Planning in Poland. Jack C. Fisher (ed.).

Luftbildatlas Schleswig-Holstein. Christian Degn and Uwe Muuss.     

PROGRAM EVALUATION AS A STRATEGY FOR PROGRAM ENHANCEMENT

Formal program evaluation is one of the most widely used tools for program termination decisions in universities. By understanding and anticipating program evaluation, a farsighted geography department can convert it from a threat into a strategy for survival in the 1980s. In the process, many departments will be renewed and improved.     

SHORT COMMUNICATION A PROGRAM FOR THE SIMULTANEOUS POTENTIOMETRIC DETERMINATION OF PROTONATION CONSTANTS AND ELECTRODE CALIBRATION PARAMETERS

A program for the potentiometric determination of the protonation constants of mononuclear polyproticsubstances is described.A maximum of twelve parameters can be determined simultaneously,includingup to six protonation constants,four electrode calibration parameters,the protolysis constant of thesolvent and the titrant concentration.Optimization is carried out by using the non-simplifiedNewton-Raphson method,which is potentiated by the Marquardt algorithm and a distance speeding-upcoefficient.A direct search method is also used to improve the initial set of values.Variances arecalculated very accurately,since the real Hessian function is used.Statistical weights and ionic strengthcorrections are also considered,The program has been tested by using simulated titration curves ofpolyprotic acids with close constants.     

秦岭-黄淮平原交界带土壤物质迁移与积累

以横断秦岭－黄淮平原交界带中部的土壤断面为研究对象,应用土壤地球化学观点,讨论了交界带土壤物质迁移和积累规律。自西向东,随着海拔下降,土壤表层硅铝率逐渐增大,大部分土壤表层物质遵循迁移－积累－迁移－积累规律;“暖坡”地带是交界土壤地球化学活跃地段。并讨论了土壤物质迁移与土壤性质的关系．     

冰芯中MSA迁移假说的延伸和完善

MSA在冰芯深层的“迁移”现象的存在 ,关系到能否应用大气中 MSA季节特征进行极地冰芯断代 ,并以冰芯分析结果确定大气中生物硫化物含量的方法基础。本文展示各类最有代表性的冰雪 MSA剖面 ,对提出冰芯深层 MSA“迁移假说”的理论依据进行探讨 ,并根据最新资料 ,说明冰川中 MSA的“迁移”和重新分布 ,在表层粒雪和渗浸 -冻结冰层中同样可能发生。对“迁移假说”的延伸补充在于 ,粒雪中的 MSA迁移是在积雪中空气与外界贯通的“开放”条件下进行的 ,渗入雪层中的融水将 MSA溶出后 ,在晶粒间宏观向下输送 ,在阳离子集中的层位发生反应 ,生成盐类冰点的改变使之发生“冻结”,重新分布。而渗浸 -冻结冰层中的迁移机制可能和深层冰川冰中的情况接近 ,即在气体与外界隔绝条件下 ,主要在“封闭”的晶间脉状纹理中以“微观”形式进行。南极半岛 MSA迁移过程需要很长时间 ,而表层渗浸 -冻结冰层中 MSA迁移过程很快出现 ,说明冰中脉状纹理的加快形成、较高冰川温度和冰层中的较大含水量等因素会对 MSA“迁移”进程起促进作用。最后 ,对 MSA“迁移”情况下 ,如何进行有关冰芯 MSA计算进行了讨论 ,对设计实验验证并完善迁移理论提出了设想。     

THE MAGNETISM OF MIAMI: SEGMENTED PATHS IN CUBAN MIGRATION*

ABSTRACT. Miami is the primate city in a system of urban settlements that make up a Cuban ethnic archipelago in the United States. The city is also a national magnet, attracting Cuban migrants from metropolitan regions across the archipelago. Four large secondary cores of Cubans outside Florida serve as major “feeders” to the Miami enclave: northern New Jersey, New York City, Los Angeles, and Chicago. Currents of migration to Miami are especially strong among older, foreign-born, and disadvantaged Cubans, an indication of segmented paths in Cuban assimilation. Although concentration in Metropolitan Miami has been the Cuban story over the past three decades, processes of deconcentration now may well be under way.     

裸地蒸发过程的数值模拟

本文以能量平衡为基础,研究了裸地蒸发过程,并提出一个用Fonran语言编写的,在IBM-PC微机上通过的裸地蒸发过程的模拟程序。这一程序能根据地表红外温度或辐射资料计算裸地蒸发量,并分析能量分配过程与土壤中的含水量、温度分布。初步的田间试验说明,计算值与实测值是比较一致的。     

PROGRAM FOR PROCESSING OF HISTORICAL LABORATORY DATA BASED ON FUZZY SET THEORY AS A TOOL FOR DECISION SUPPORT

A computer program(FEA)is presented for processing historical laboratory data.It performs on a list ofsample entries stored in a laboratory information management system.Using an algorithm which is basedon fuzzy set theory,FEA classifies the entries into a limited number of clusters called sample types.Theclassification is fully user-defined.The program transforms the historical data into a representation whichis more suitable for studying the performance of the laboratory or which can be used as preparation for asimulation project.     

THE SOURCES OF REGIONAL ELDERLY POPULATION GROWTH: MIGRATION AND AGING-IN-PLACE *

A region's elderly population has two sources of growth: net migration and the net aging-in-place of its resident population. This paper outlines a method for identifying the projected relative contribution of these two sources of elderly population growth over time, and illustrates it with data for the states of Arizona, California, Florida, Illinois, and New York. The sources of elderly population growth differ between regions and over time.