试估计GaAs和Al0.3Ga0.7As在300K的注入比。
试估计GaAs和Al0.3Ga0.7As在300K的注入比。
试估计GaAs和Al0.3Ga0.7As在300K的注入比。
考虑用以下生产函数描述的一个经济:Y=F(K,L)=K0.3L0.7。
a.人均生产函数是什么?
b.假定没有人口增长或技术进步,找出稳定状态的人均资本存量、人均产出,以及作为储蓄率和折旧率函数的人均消费。
c.假定折旧率是每年10%。作一个表,表示储蓄率分别为0、10%、20%、30%等时,稳定状态的人均资本、人均产出和人均消费。(你需要用一个有指数键的计算器来计算这个问题。)使人均产出最大化的储蓄率是多少?使人均消费最大化的储蓄率是多少?
d.用微积分找出资本的边际产量。在你的表上增加一项——每种储蓄率下的资本的边际产量减折旧。你的表说明了什么?
Consider an economy described by the production function Y=F(K,L)=K0.3L0.7.
a.What is the per-worker production function?
b.Assuming no population growth or technological progress, find the steady-state capital stock per worker, output per worker, and consumption per worker as functions of the saving rate and the depreciation rate.
c.Assume that the depreciation rate is 10 percent per year. Make a table showing steady-state capital per worker, output per worker, and consumption per worker for saving rates of 0 percent, 10 percent, 20 percent, 30 percent, and so on. (You will need a calculator with an exponent key for this.) What saving rate maximizes output per worker? What saving rate maximizes consumption per worker?
d.(Harder) Use calculus to find the marginal product of capital. Add to your table the marginal product of capital net of depreciation for each of the saving rates. What does your table show?
考虑用以下生产函数描述的一个经济:Y=F(K,L)=K0.3L0.7。
a.人均生产函数是什么?
b.假定没有人口增长或技术进步,找出稳定状态的人均资本存量、人均产出,以及作为储蓄率和折旧率函数的人均消费。
c.假定折旧率是每年10%。作一个表,表示储蓄率分别为0、10%、20%、30%等时,稳定状态的人均资本、人均产出和人均消费。(你需要用一个有指数键的计算器来计算这个问题。)使人均产出最大化的储蓄率是多少?使人均消费最大化的储蓄率是多少?
d.用微积分找出资本的边际产量。在你的表上增加一项——每种储蓄率下的资本的边际产量减折旧。你的表说明了什么?
Consider an economy described by the production function Y=F(K,L)=K0.3L0.7.
a.What is the per-worker production function?
b.Assuming no population growth or technological progress, find the steady-state capital stock per worker, output per worker, and consumption per worker as functions of the saving rate and the depreciation rate.
c.Assume that the depreciation rate is 10 percent per year. Make a table showing steady-state capital per worker, output per worker, and consumption per worker for saving rates of 0 percent, 10 percent, 20 percent, 30 percent, and so on. (You will need a calculator with an exponent key for this.) What saving rate maximizes output per worker? What saving rate maximizes consumption per worker?
d.(Harder) Use calculus to find the marginal product of capital. Add to your table the marginal product of capital net of depreciation for each of the saving rates. What does your table show?
晶格常数分别为a1、a2的两种材料,皆为金刚石结构,当分别在(100)、(110)及(111)面构成异质结时,求悬挂键密度。
用光子流强为Po、光子能量为hν的光照射一个由金属和n型半导体构成,的肖特基光电二极管。已知Eg>hν>qφe(φB为接触电势差),则在金属层内产生的光生电子,有部分向半导体内发射。如金属中的光吸收系数为α,金属膜的厚度为l,则离光照的金属表面x处的光生电子逸入半导体的几率为e-b(l-x)。金属中光生电子的量子产额为β。试证:
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