搜索结果: 1-15 共查到“理学 trade”相关记录28条 . 查询时间(0.14 秒)
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：A decomposition of pollution intensity in China's value-added trade
中国 增值贸易 污染强度 分解
2023/4/24
Based on a multi-regional input-output model, this study explores the temporal changes and driving forces of China's environmental losses relative to its economic gains from international trade with e...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Research on Port Cities' Transportation System and Trade Flows in China
中国港口城市 交通系统 贸易流动
2023/5/5
This paper quantitatively investigates the effect of transportation system on trade flows of four major port cities in China. Due to the significant country-pair heterogeneities in both intercept and ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：International trade and Covid-19: City-level evidence from China's lockdown policy
国际贸易 新冠肺炎 中国封锁政策 城市证据
2023/5/16
We examines the impact of Covid-19 lockdowns on exports by Chinese cities. We use city-level export data at a monthly frequency from January 2018 through April 2020. Differences-in-differences estimat...
A long-distance connection:Polar climate affects trade wind strength in tropics（图）
long-distance connection Polar climate trade wind strength tropics
2020/12/11
It has long been recognized that variations in sea surface temperature in the tropical Pacific affect global climate. The episodic warming of the tropical Pacific during El Niño events causes the...
Hormones Help Tadpoles Trade Size For Survival In A Warming Climate,Says Uc Study（图）
Hormones Tadpoles Trade Size Warming Climate Uc Study
2017/11/23
Deep within aquatic ecosystems all over the world, certain toad species have managed to survive warmer and drier climate change. But the method behind their metamorphic adaptation to environmental cha...
Genetic mutation trade-offs lead to parallel evolution
Genetic mutation trade-offs parallel evolution
2017/7/20
Organisms in nature adapt and evolve in complex environments. For example, when subjected to changes in nutrients, antibiotics, and predation, microbes in the wild face the challenge of adapting multi...
“Smart” Cephalopods Trade Off Genome Evolution for Prolific RNA Editing
Smart Cephalopods Trade Off Genome Evolution Prolific RNA Editing
2017/4/27
Octopus, squid, and cuttlefish are famous for engaging in complex behavior, from unlocking an aquarium tank and escaping to instantaneous skin camouflage to hide from predators. A new study suggests t...
Trade-off between seismic source detail and crustal heterogeneities in spherical 3D finite element modeling: a 2004 Sumatra earthquake case study
finite element method 3D modeling static deformation
2015/8/27
Finite-element methods are a powerful numerical simulation tool for modeling seismic events, as they allow three-dimensional complex models to be solved. We used a three-dimensional finite-element app...
Example of exact trade-offs in linear controller design
Linear time-invariant controller robust controller linear quadratic gaussian the numerical calculation
2015/8/13
The design of a linear time-invariant controller for a given linear-time-invariant plant, like any engineering design, involves tradeoff among many desirable qualities, such as fast response to comman...
Reputation and coalitions in medieval trade:evidence on the maghribitraders
maghribitraders Reputation and coalitions
2015/7/20
Reputation and coalitions in medieval trade:evidence on the maghribitraders。
A buyer and seller have the opportunity to exchange an indivisible good at
a prespecified price. Each agent may be imperfectly informed, in an arbitrary
way, about both his own value for the g...
Bounds and Trade-offs for Double-Base Number Systems
Elliptic Curve Cryptography Scalar Multiplication Double-Base Number System Double-Base Chain
2012/12/4
During the past twenty years, elliptic curves have attracted more and more attention fromthe cryptography community.One of the core operations of elliptic curve cryptography protocols is the scalar mu...
Retailer's pricing and ordering strategy for Weibull distribution deterioration under trade credit in declining market
Finance Weibull deterioration trade credit
2010/9/21
In this research article, an ordering and pricing policy is formulated for a retailer when the supplier offers a delay in payments to settle the accounts against the retailer’s due. The problem is to ...
The discrete time-cost-quality trade-off problem using a novel hybrid genetic algorithm
Time cost quality trade-off Project scheduling
2010/9/26
Time, cost and quality are among the major objectives of any project .In recent years, the demands of project stakeholders regarding reductions in the total cost and time of a project along with achie...
Noncoherent Interference Alignment: Trade Signal Power for Diversity Towards Multiplexing
Noncoherent Interference Alignment Trade Signal Power Diversity Multiplexing
2010/12/13
This paper proposes the first known universal interference alignment scheme for general (1 × 1)K interference networks, either Gaussian or deterministic, with only 2 symbol extension.