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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：HT-Net: Hierarchical Transformer based Operator Learning Model for Multiscale PDEs
HT-Net 分层变压器 多尺度 偏微分方程 算子学习模型
2022/11/28
Complex nonlinear interplays of multiple scales give rise to many interesting physical phenomena and pose major difficulties for the computer simulation of multiscale PDE models in areas such as reser...
MIT expands research collaboration with Commonwealth Fusion Systems to build net energy fusion machine, SPARC（图）
英联邦聚变系统公司 能量聚变机 SPARC 聚变发电厂
2022/5/10
MIT’s Plasma Science and Fusion Center (PSFC) will substantially expand its fusion energy research and education activities under a new five-year agreement with Institute spinout Commonwealth Fusion S...
利用密度泛函理论和非平衡态格林函数相结合的方法，系统地研究了边修饰Net-Y纳米带的电子结构和器件特性的应变调控效应。计算表明：本征纳米带为金属，但边缘的氢或氧原子端接能使其转变为半导体。应变能有效地调控纳米带带隙的大小，适当的应变使能带结构从间接带隙转变为较小的直接带隙，这有利于光的吸收。应变也能改变纳米带的功函数，压缩应变能明显减小功函数，这有利于纳米带实现场发射功能。特别是应变能有效地调控纳...
SPATIO-TEMPORAL CHANGES OF NET PRIMARY PRODUCTIVITY AND ITS RESPONSE TO PHENOLOGY IN NORTHEAST CHINA DURING 2000–2015
Northeast China NDVI Net Primary Productivity Phenology Spatio-temporal Changes
2018/4/30
The relationship between net primary productivity (NPP) and phenological changes is of great significance to the study of regional ecosystem processes. In this study, firstly, NPP was estimated with t...
近日，中国科学院物理研究所/北京凝聚态物理国家研究中心研究员王建涛、博士聂思敏、研究员翁红明，日本东北大学教授川添良幸，美国内华达大学教授陈长风合作，通过第一性原理计算，提出一个新的三维碳烯晶体结构【图1(a)】。该结构具有体心正方对称性(I4/mmm)，单位晶胞包含40个碳原子，因此简称为BCT-C40。它可以看做是一维(5,5)碳纳米管的三维重构形式，但能量上比(5,5)碳纳米管、fcc-C6...
近日，中国科学院物理研究所/北京凝聚态物理国家研究中心研究员王建涛、博士聂思敏、研究员翁红明，日本东北大学教授川添良幸，美国内华达大学教授陈长风合作，通过第一性原理计算，提出一个新的三维碳烯晶体结构【图1(a)】。该结构具有体心正方对称性(I4/mmm)，单位晶胞包含40个碳原子，因此简称为BCT-C40。它可以看做是一维(5,5)碳纳米管的三维重构形式，但能量上比(5,5)碳纳米管、fcc-C6...
Regularization and variable selection via the elastic net
Grouping effect LARS algorithm Lasso Penalization p>n problem Variable selection
2015/8/21
We propose the elastic net, a new regularization and variable selection method. Real world data and a simulation study show that the elastic net often outperforms the lasso, while enjoying a similar s...
Scrambled geometric net integration over general product spaces
Discrepancy Multiresolution Rendering Scrambled net
2015/8/21
Quasi-Monte Carlo (QMC) sampling has been developed for integration over [0;1]s where it has superior accuracy to Monte Carlo (MC) for
integrands of bounded variation.
Development of an ensemble-adjoint optimization approach to derive uncertainties in net carbon fluxes
derive uncertainties net carbon fl uxes
2014/12/9
Accurate modelling of the carbon cycle strongly
depends on the parametrization of its underlying processes.
The Carbon Cycle Data Assimilation System (CCDAS) can
be used as an estimator algorithm t...
Physicochemical and biological controls on primary and net community production across northeast Pacific seascapes
northeast Pacific seascapes Physicochemical biological controls
2014/11/28
The subarctic–subtropical transition zone in the North Pacific represents the second largest sink of
atmospheric carbon dioxide in the world ocean, yet the relative importance of physical and biologi...
Nitrogen enrichment increases net silica accumulation in a temperate salt marsh
Nitrogen enrichment increases net silica accumulation a temperate salt marsh
2014/4/2
Two New England salt marshes exposed to different N availability were assessed seasonally for 1 yr, creating the first complete salt marsh Si budgets. Triplicate seasonal measurements were collected f...
Net Phosphorus Requirements of Dorper×Thin-tailed Han Crossbred Ram Lambs
P Requirement Comparative Slaughter Trial Maintenance Growth Lambs
2013/5/12
A comparative slaughter trial was conducted to estimate the phosphorus (P) requirement for maintenance and growth of crossbred lambs of Dorper with a Chinese indigenous sheep breed, thin-tailed Han sh...
Comparing Process-Based Net Primary Productivity Models in a Mediterranean Watershed
NPP Modelling Remote Sensing Percent Tree Cover Model Comparison CASA LPJ-GUESS
2013/4/22
The aim of this study was to compare the estimation capability of two different process-based NPP models (CASA and LPJGUESS) in a Mediterranean watershed. Remotely sensed data and climate time series ...
Mats of the nonnative macroalga, Gracilaria vermiculophylla, alter net denitrification rates and nutrient fluxes on intertidal mudflats
nonnative macroalga Gracilaria vermiculophylla
2013/4/2
We hypothesized that mats of a nonnative macroalga, Gracilaria vermiculophylla, which is often found
incorporated several centimeters into intertidal mudflat sediments, would increase net denitrifica...
Lactation Persistency as a Component Trait of the Selection Index and Increase in Reliability by Using Single Nucleotide Polymorphism in Net Merit Defined as the First Five Lactation Milk Yields and Herd Life
Economic Weights Milk Yield Persistency Herd Life Selection Index
2012/5/10
We first sought to clarify the effects of discounted rate, survival rate, and lactation persistency as a component trait of the selection index on net merit, defined as the first five lactation milks ...