Background Developed over the last 25 years- Brandt (1973) published first paper with practical results Offers the possibility of solving a problem with work and storage proportional to the number of unknowns Well developed for linear elliptic problems application to other equations is still an active area of research

AN INTRODUCTION FOR STUDENTS OF FOOD SCIENCE AND AGRICULTURE FOURTH EDITION N. L. KENT Sometime Scholar of Emmanuel College, Cambridge Formerly at the Flour Milling and Baking Research Association

Raphan T, Matsuo V, Cohen B (1979). Velocity storage in the vestibulo-ocular reflex arc (VOR). Experimental Brain Research 35:229-248. Henn V, Cohen B, Young LR (1980). Visual-vestibular interaction in motion perception and the generation of nystagmus

Permission for the publication herein of Sadtler Standard Spectrahas been granted, and all rights are reserved. by Sadtler Research Laboratories, Division of Bio-Rad Laboratories, Inc. This book is printed on acid-free paper. g Copyright o 1998 by John Wiley Sons, Inc, All rights reserved Published simultancously in Canada

6.1 Introduction: the problem of providing nutrition information Developments in nutrition research and improved scientific understanding of the relationship between diet and health have led to increasing interest in the nutri￾tional aspects of the food supply. This interest is shared by academics, health professionals, government officials, consumers and the food and supplement industries alike, although not always for the same reasons and generally at dif￾ferent levels of knowledge and understanding. Interest in nutrition, in respect of both total diet and individual foods, is second only to concern about food safety

市场调查是运用科学方法记录、汇集、整理和分析有关市场活动资料，了解市场活动过 去和现在的状况，为市场预测和决策提供依据。 这个定义可以概括为 3 个要点：

市场调查是取得直接市场资料的基本方法。通过市场调查，企业管理者可以了解市场行 情，做到心中有数。这不但可以提高经济管理的水平，改善企业的服务质量和提高企业经济 效益；而且还是市场预测必不可少的前提和基础，市场调查为市场预测提供可靠的资料

随着社会的发展，人们的受教育面越来越普遍，受教育程度越来越高。在此基础上，问 卷调查法成为现代社会进行各种调查员常采用的方法。问卷调查法是访问调查法的发展和延 伸，在各种调查中具有广泛的用途，发挥着重要的作用。在市场调查中，问卷调查法也有极 为重要地位

判断分析市场预测法是相对于各种定量预测法来说的一类预测方法。 判断分析市场预测法，也称定性市场预测法。判断分析市场预测法是指预测者在以各种 方法取得市场资料后，在对这些资料进行整理加工和分析研究的基础上，运用自己的实践经 验和判断分析能力，对市场未来的发展变化趋势做出估计测算预测值

市场调查是一种有条不紊、规范化的活动，包括一系列繁琐、复杂的操作步骤，依靠个 别人的工作是难以完成的。市场调查通常是一种组织行为，必须由一定形式的组织机构来完 成。 市场调查机构是指专门或主要从事市场调查活动的单位或部门。对于在企业(或公司) 里设立的主要从事市场调查活动的有关部门，称为企业市场调查机构(或公司)，即市场调查 的内部提供者；对于专门从事市场调查活动的单位，称为专业市场调查机构(或公司)，即市 场调查的外部提供者