Kunlun Li

Multiscale time-varying model of Portland cement strength considering pore size distribution, portlandite volume, and mean chain length effects

Kunlun Li, Hua Li, Muyu Liu, Guitao Luo et autres

cn, sg (code pays fourni par la source)

In-Plane Strain in Thin Film Peeling: A Numerical Study and a Unified Criterion for Stage Transition

Kunlun Li, Minjia Xu, Lu Jia, Yuan Gao et autres

Releasing a thin film adhered to a rigid substrate by peeling is a fundamental issue in interfacial mechanics and is of practical significance in many fields including flexible electronics, heterogeneous integration, and advanced packaging. While classical peeling theories have established the relationship …

cn (code pays fourni par la source)

Scalable Training of Mixture-of-Experts Models with Megatron Core

Zijie Yan, Hongxiao Bai, Xin Yao, Dennis Liu et autres

Scaling Mixture-of-Experts (MoE) training introduces systems challenges absent in dense models. Because each token activates only a subset of experts, this sparsity allows total parameters to grow much faster than per-token computation, creating coupled constraints across memory, communication, and computation. Optimizing one …

Scalable Training of Mixture-of-Experts Models with Megatron Core

Zijie Yan, Hongxiao Bai, Xin Yao, Dennis Liu et autres

Scaling Mixture-of-Experts (MoE) training introduces systems challenges absent in dense models. Because each token activates only a subset of experts, this sparsity allows total parameters to grow much faster than per-token computation, creating coupled constraints across memory, communication, and computation. Optimizing one …

Channel Estimation Assisted Bistatic Localization in Terrestrial and Non-Terrestrial Networks

Kunlun Li, Chao Zhang, Mohammed El‐Hajjar, Chao Xu et autres

Low-Earth-orbit (LEO) satellites are regarded as a key enabler for 6G communications and localization, due to their large coverage beyond conventional terrestrial networks. In this paper, we propose a downlink LEO base station (BS) bistatic localization framework relying on hybrid beamforming that …

gb (code pays fourni par la source)

Space–Air–Ground-Integrated Networks: The BER vs. Residual Delay and Doppler Analysis

Chao Zhang, Kunlun Li, Chao Xu, Lie‐Liang Yang et autres

Perfect Doppler compensation and synchronization is nontrivial due to multi-path Doppler effects and Einstein’s theory of relativity in the space-air-ground-integrated networks (SAGINs). Hence, by considering the residual Doppler and the synchronization delay, this paper investigates the bit-errorrate (BER) performance attained under time-varying …

gb (code pays fourni par la source)

A multiphysics–multiscale model of Portland cement hydration predicting temporal evolution of microstructure and strength-relevant properties

Kunlun Li, Muyu Liu, Hua Li, Guitao Luo et autres

Portland cement strength is governed by hydration properties including heat flow, hydration degree, porosity, pore size distribution, portlandite content, ratio of calcium to silicon, and mean chain length. However, no existing model theoretically predicts all these parameters by considering the hydration time. …

sg, cn (code pays fourni par la source)

Research on reliability of straight pin solder joints in CFP package with different process parameters

Hongchao Ji, Kunlun Li, Ke Men, Kaixuan Ai et autres

To examine the effects of various process parameters on the reliability of straight pin solder joints in CFP packaging, assemblies were fabricated with randomly combined process conditions. Analysis of solder joint performance under temperature cycling indicates that device type and pin length …

cn (code pays fourni par la source)

A novel adsorption–complexation–rheology model for PCE effects in early‐age Portland cement hydration

Guitao Luo, Hua Li, Muyu Liu, Kunlun Li et autres

Abstract Superplasticizers play dual regulatory roles during early Portland cement hydration they retard hydration kinetics while enhancing paste fluidity. However, research gaps remain in quantitatively modeling the retardation behavior of superplasticizers and in establishing mechanistic linkages between the time‐dependent rheological effects in …

cn, sg (code pays fourni par la source)

NVIDIA Nemotron Nano 2: An Accurate and Efficient Hybrid Mamba-Transformer Reasoning Model

NVIDIA, Aarti Basant, Abhijit Khairnar, Abhijit Paithankar et autres

We introduce Nemotron-Nano-9B-v2, a hybrid Mamba-Transformer language model designed to increase throughput for reasoning workloads while achieving state-of-the-art accuracy compared to similarly-sized models. Nemotron-Nano-9B-v2 builds on the Nemotron-H architecture, in which the majority of the self-attention layers in the common Transformer architecture …

Stalactite-Inspired Microstructures Synergizing with Embedded Interdigitated Electrodes for Wide-Range Piezoresistive Sensors

Bangbang Nie, Jiyu Chen, Jinyu Wang, Meng-Qi Wang et autres

Flexible pressure sensors featuring surface microstructures are gaining increasing significance in diverse applications, such as health monitoring systems, smart wearable devices, and human–computer interaction. However, the inherent trade-off between high sensitivity and a broad detection range remains a significant challenge. To overcome …

cn, us (code pays fourni par la source)

Holographic MIMO Aided Integrated User-Centric Cell-Free Terrestrial and Non-Terrestrial Networks

Qingchao Li, Mohammed El‐Hajjar, Chao Xu, Kunlun Li et autres

With the rapid growth of global communication demand, the limitations of traditional terrestrial networks (TNs) in terms of their coverage, reliability and resource utilization efficiency are becoming increasingly apparent. To address these challenges, this paper proposes a holographic multiple-input multiple-output (MIMO) user-centric …

gb (code pays fourni par la source)