TIMBER MARKETS AND FUEL TREATMENTS IN THE WESTERN U.S.

ABSTRACT. We developed a model of interrelated timber markets in the U.S. West to assess the impacts of large‐scale fuel reduction programs on these markets, and concomitant effects ofthe market on the fuel reduction programs. The linear programming spatial equilibrium model allows interstate and international trade with western Canada and the rest of the world, while accounting for price effects of introducing softwood logs to the market. The model maximizes area treated, given fire regime‐condition class priorities, maximum increases in softwood processing capacity, maximum rates of annual treatments, prohibitions on exports of U.S. and Canadian softwood logs from public lands and a fixed annual treatment budget. Results show that the loss to U.S. private timber producers is less than the gains for timber consumers (mills). States receiving more treatments when spending is not constrained by state proportions include Idaho, Montana, New Mexico and Oregon. When only the wildland‐urban interface is treated, California, Oregon and Washington receive more treatments. Utah and Colorado receive more treatments when low risk stands are included.     

金融市场建模原则与财富过程的最优增长

建模在数理金融理论中占有重要的地位，本文推广了「１」的建模原则。     

摩擦市场的利率期限结构的无套利分析

本文用无套利方法分析有摩擦金融市场中利率的期限结构.对存在有限个债券和离散有限个到期日以及存在成比例的交易费、买卖差价、税赋这三种摩擦的金融市场,引入了相容期限结构的概念,给出了相容期限结构和套利机会的存在性结果或充要条件及它们的识别与计算方法.     

中美数学研究人员交流计划申请指南

为了加强中美青年科学家在数学领域交流,营造有利于中国科研人员参与国际(地区)合作与竞争的良好环境,鼓励基金承担者开展积极而富有成效的国际合作与交流.中国国家自然科学基金委员会和美国基金会就数学领域的合作签署合作备忘录,共同支持中美数学研究人员.     

国家自然科学基金数学动态报道 中美数学研究人员交流计划申请指南

为了加强中美青年科学家在数学领域交流，营造有利于中国科研人员参与国际（地区）合作与竞争的良好环境，鼓励基金承担者开展积极而富有成效的国际合作与交流。中国国家自然科学基金委员会和美国基金会签署合作协议，共同支持中美数学研究人员。     

Dynamic Three-Dimensional Display of U.S. Air Traffic

Abstract

We describe methods developed to interpolate and project flight paths of aircraft in controlled airspace over the continental United States from aperiodic position reports. There are a number of unusual features of the dynamic displays we have developed. Our visualizations can be viewed from either a fixed or moving viewpoint. The direction and distance of the focal point from the viewing point is under program control (allowing viewing in a direction other than the direction of motion of the viewpoint). The maximum and minimum depth of field is under program control (allowing viewing of selected local subsets of the data).     

ANALYSIS OF A MECHANICAL SOLVER FOR LINEAR SYSTEMS OF EQUATIONS S

1. Introduction/ A new approaCh to solve systems of linear eqttations, equlvaleat to solve the ~ion of adamped harmonic oscillator, has been PrOPosed in a previous paper[11. Due to this parallelism,we call such methods Mechanical Solvers for systems of linear equations. The present study isdevoted to the analysis of these methods.Let be the linear systemwhere we assume that A is an m x m nonsingular matriX (i.e. the system has a ~ solution).We may associate to it the Newton's equation for …     

THE EXISTENCE AND UNIQUENESS OF SOLUTION FOR A CLASS OF STOCHASTIC FUNCTIONAL EQUAFIONS ON S.P.SPACE

We staxt in discussing a class of more general functional equations in tliis paper, andthe maill ainl is to establish the existence and uniquenes8 of solution of a class of stochasticfunctioual equations on stochastic processes space (called "S.P space" for sllort). The11 usingthe resuIt to son1e specia1 kil1ds ofordillary differential equation, stochastic differential (integral)equation (called "S.D.E." or "S.I.E." fOr short), a series of corollaries l1ave been derived. Someof then1 can b…     

美国的数学教育

本文是作者为意大利数学家写的一篇报告，作者是美国Center for Mathematical Education，Newton，MA的主任，鉴于其中对美国数学教育作了较全面的介绍，故摘译于此，希望有助于我们改进教学，作者还有另一篇文章讲中学数学教师的数学培训，因未找到，原文中涉及该文处，只好改写，又因为时间关系，没有逐句仔细翻译，但希望大意不错，请读者原谅。