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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Global and Local Convergence-Rate Analysis of an Inexact Newton Augmented Lagrangian Method for Zero-One Composite Optimization
零一复合优化 不精确 牛顿增强拉格朗日方法 收敛率分析
2023/4/14
Zero-One Composite Optimization (0/1-COP) is a prototype of nonsmooth, non- convex optimization problems and it has attracted much attention recently. Augmented Lagrangian Method (ALM) has stood out a...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Convergence analysis of one-point large deviations rate functions of numerical methods for stochastic wave equations with small noise
小噪声 随机波动方程 数值方法 单点大偏差率 函数收敛分析
2023/4/21
In this talk, we present the pointwise convergence of one-point large deviations rate functions (LDRFs) of the spatial finite difference method and further the fully discrete method based on the tempo...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：μ-basis for a tensor product rational surface with respect to one variable
张量积 有理曲面 变量 μ基
2023/4/28
The method of moving planes and moving quadrics expresses the implicit equation of a rational parametric surface as a compact determinant. Efficient computation of the moving planes and moving quadric...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Towards a zero-one law for improvements to Dirichlet's approximation theorem
Dirichlet近似定理 改进 零一定律
2023/5/10
In this talk we discuss a notion of $\psi$-Dirichlet in Diophantine approximation which concerns improving Dirichlet’s approximation theorem to a general approximating function $\psi$. This notion was...
中国科学院大气物理研究所One Earth：全球2℃增温可能造成小麦价格峰值增加，提升主粮自给是全球粮食生产安全的关键（图）
气候变化 全球2℃增温 小麦价格峰值增加 全球粮食生产安
2022/3/21
小麦是一种起源于温带的喜凉作物，是全球三大谷物之一，每年提供了全球人口20%的蛋白质和卡路里。目前气候变化的小麦影响评估研究主要集中于研究气候平均态的变化对小麦产量的影响和模型不确定性上。但产量仅是粮食安全问题的一个方面，国际农业贸易也是全球众多国家保持粮食供给的重要手段。因此粮食安全的其它维度（如，农产品价格、农业相关的社会经济与民生问题）同等重要，但相关研究非常有限。
随着经济增长和社会发展，气候变化越来越重要，成为全球面临的巨大问题和挑战。2015年《巴黎协定》在第21届联合国气候变化大会上通过，成为全球气候治理进程中新的里程碑。然而气候协定中的国家自主贡献、资金机制和全球盘点在没有强制的情况下是否有效仍存在争议（图1）。近日国际期刊Cell子刊One Earth发表了北师大系统科学学院与数学科学学院、Universidade do Minho合作的最新研究成...
Only one human fat cell subtype responds to insulin stimulation
AdipoPLIN fat cells insulin diabetes
2021/8/11
It is well known that fat cells can influence our sensitivity to insulin. Now, researchers have discovered that there are three different subtypes of mature fat cells in white adipose tissue and that ...
Leaping squirrels! Parkour is one of their many feats of agility
squirrel jumping agility of robot
2021/8/6
Biologists tested free-ranging squirrels to determine how quickly they adapt to the bendiness of their launching branch in order to successfully land. The squirrels learned within a few trials to leap...
Like matryoshka dolls: One insect species introduced decades ago to a small island had an effect on several insect populations
insect bacterial symbiont genetic ecological system
2021/8/5
Researchers thought 30 years ago that they just introduced some Glanville fritillary butterfly larvae on a small island in the Åland islands, Finland. Little did they know that within the butterf...
Aheart surgeon doesn’t need to grasp quantum mechanics to perform successful operations. Even chemists don’t always need to know these fundamental principles to study chemical reactions. But the worki...
How fast is the universe expanding? Galaxies provide one answer（图）
universe expanding Galaxies answer
2021/4/9
Determining how rapidly the universe is expanding is key to understanding our cosmic fate, but along with more precise data comes a conundrum. Estimates based on measurements in our current universe d...
New sunspot cycle could be one of the strongest on record（图）
New sunspot cycle could strongest record
2020/12/18
A team of scientists led by the National Center for Atmospheric Research is predicting that the sunspot cycle that started this fall could be one of the strongest since record-keeping began.In a new a...
Heavy rainfall drives one-third of nitrogen runoff, according to new study（图）
Heavy rainfall drives one-third nitrogen runoff according new study
2020/11/13
Heavy rain events that occur only a few days a year can account for up to one-third of the annual nitrogen runoff from farmland in the Mississippi River basin, according to a new study by Iowa St...
One-third of plant and animal species could be gone in 50 years（图）
One-third plant animal species gone 50 years
2020/2/20
Accurately predicting biodiversity loss from climate change requires a detailed understanding of what aspects cause extinctions, and what mechanisms may allow species to survive.
中国地质大学科学技术发展院赖旭龙教授团队 BGEG国家重点实验室 PLoS ONE, Available online:16 May 2019, Molecular identification of late and terminal Pleistocene Equus ovodovi from northeastern China
线粒体基因组；水平；证实；马科；绝灭种
2021/10/20
2019年5月16日，综合期刊《PLoS ONE》在线刊发了中国地质大学生物地质与环境地质国家重点实验室赖旭龙教授团队与德国波兹坦大学、中科院古脊椎动物与古人类研究所等单位研究人员合作研究的学术论——我国东北地区晚更新世及更新世-全新世之交马科新种的分子识别（Molecular identification of late and terminal Pleistocene Equus ovodov...