Tensilica公司日前宣布结盟S2C公司共建SoC原型合作伙伴关系。S2C公司为提供创新的，基于FPGA的ESL（电子系统级）和SoC原型解决方案的全球领先提供商，在中国市场属快速成长期。S2C已将Tensilica的Diamend Standard 108mini集成到TAI L...Tensilica公司日前宣布结盟S2C公司共建SoC原型合作伙伴关系。S2C公司为提供创新的，基于FPGA的ESL（电子系统级）和SoC原型解决方案的全球领先提供商，在中国市场属快速成长期。S2C已将Tensilica的Diamend Standard 108mini集成到TAI Logic Module基于FPGA的ESL平台中，并正在开发针对Tensilica广受欢迎的Diamond Standard 330HiFi音频IP核的参考设计和演示平台。展开更多
One of the continuity conditions identified by Utumi on self-injective rings is the C3-condition, where a module M is called a C3-module if whenever A and B are direct summands of M and A A B = 0, then A B is a summa...One of the continuity conditions identified by Utumi on self-injective rings is the C3-condition, where a module M is called a C3-module if whenever A and B are direct summands of M and A A B = 0, then A B is a summand of M. In addition to injective and direct-injective modules, the class of C3-modules includes the semisimple, continuous, indecomposable and regular modules. Indeed, every commutative ring is a C3-ring. In this paper we provide a general and unified treatment of the above mentioned classes of modules in terms of the C3-condition, and establish new characterizations of several well known classes of rings.展开更多
Water electrolysis has been regarded as a promising technology to produce clean hydrogen fuel with high purity. However, large-scale water electrolysis has been greatly hindered due to the lack of non-noble metal cata...Water electrolysis has been regarded as a promising technology to produce clean hydrogen fuel with high purity. However, large-scale water electrolysis has been greatly hindered due to the lack of non-noble metal catalysts with high catalytic performance. Benefitting from unique hollow structures with large surface area and adjustable chemical compositions, hollow design plays an important role in improving the electrocatalytic performance for hydrogen evolution reaction(HER). Herein, we report an effective multi-step strategy to prepare hierarchical Co-decorated Mo_(2)C hollow spheres(CMCHSs) as electrocatalyst for HER. To be specific, the preparation process involves a metal-chelated polymerization and a subsequent surface modulation process. Owing to the unique hollow structure and incorporation of Co species,the as-prepared CMCHSs demonstrate largely enhanced HER performance with a low overpotential of 139 mV at the current density of 10 m A·cm^(-2) and good cycling durability in acid. The present research work highlights a new feasible strategy for the design of HER electrocatalyst via hollow designs and surface engineering.展开更多
针对YOLOv8s模型在钢材表面缺陷检测任务中特征提取能力不足、特征融合不充分以及收敛速度慢、回归精度差等问题,提出一种基于改进YOLOv8s的钢材表面缺陷检测算法。首先,为了使模型关注更多维度的特征信息,将YOLOv8s模型主干网络和颈部...针对YOLOv8s模型在钢材表面缺陷检测任务中特征提取能力不足、特征融合不充分以及收敛速度慢、回归精度差等问题,提出一种基于改进YOLOv8s的钢材表面缺陷检测算法。首先,为了使模型关注更多维度的特征信息,将YOLOv8s模型主干网络和颈部网络中的部分C2f模块替换为C2f-Triplet模块;其次,为了使模型在更大的感知区域内聚合上下文信息,将YOLOv8s模型颈部网络中的最近邻上采样模块替换为内容感知特征重组(content-aware reassembly of features,CARAFE)上采样算子;最后,为了提高模型收敛速度和回归精度,将原YOLOv8s的CIoU回归损失函数替换为SIoU损失函数。实验结果表明:在NEU-DET数据集上,改进后的YOLOv8s钢材表面缺陷检测算法较原YOLOv8s算法精确率提高1.6百分点,平均精度均值提高2.2百分点。相比于目前主流的钢材表面缺陷检测算法,改进后的YOLOv8s钢材表面缺陷检测算法可以更加准确地检测出钢材表面缺陷的类别和位置,并且模型相对较小,便于在移动端部署。展开更多
Let R be a ring and n be a positive integer.Then R is called a left n-C2-ring(strongly left C2-ring)if every n-generated(finitely generated)proper right ideal of R has nonzero left annihilator.We discuss some n-C2 and...Let R be a ring and n be a positive integer.Then R is called a left n-C2-ring(strongly left C2-ring)if every n-generated(finitely generated)proper right ideal of R has nonzero left annihilator.We discuss some n-C2 and strongly C2 extensions,such as trivial extensions,formal triangular matrix rings,group rings and[D,C].展开更多
文摘Tensilica公司日前宣布结盟S2C公司共建SoC原型合作伙伴关系。S2C公司为提供创新的，基于FPGA的ESL（电子系统级）和SoC原型解决方案的全球领先提供商，在中国市场属快速成长期。S2C已将Tensilica的Diamend Standard 108mini集成到TAI Logic Module基于FPGA的ESL平台中，并正在开发针对Tensilica广受欢迎的Diamond Standard 330HiFi音频IP核的参考设计和演示平台。
文摘One of the continuity conditions identified by Utumi on self-injective rings is the C3-condition, where a module M is called a C3-module if whenever A and B are direct summands of M and A A B = 0, then A B is a summand of M. In addition to injective and direct-injective modules, the class of C3-modules includes the semisimple, continuous, indecomposable and regular modules. Indeed, every commutative ring is a C3-ring. In this paper we provide a general and unified treatment of the above mentioned classes of modules in terms of the C3-condition, and establish new characterizations of several well known classes of rings.
基金financially supported by the National Natural Science Foundation of China (No.51902016)the Fundamental Research Funds for the Central Universities (Nos.buctrc201829 and buctrc201904)the "Double-First Class" Construction Projects (No.XK1804-02)。
文摘Water electrolysis has been regarded as a promising technology to produce clean hydrogen fuel with high purity. However, large-scale water electrolysis has been greatly hindered due to the lack of non-noble metal catalysts with high catalytic performance. Benefitting from unique hollow structures with large surface area and adjustable chemical compositions, hollow design plays an important role in improving the electrocatalytic performance for hydrogen evolution reaction(HER). Herein, we report an effective multi-step strategy to prepare hierarchical Co-decorated Mo_(2)C hollow spheres(CMCHSs) as electrocatalyst for HER. To be specific, the preparation process involves a metal-chelated polymerization and a subsequent surface modulation process. Owing to the unique hollow structure and incorporation of Co species,the as-prepared CMCHSs demonstrate largely enhanced HER performance with a low overpotential of 139 mV at the current density of 10 m A·cm^(-2) and good cycling durability in acid. The present research work highlights a new feasible strategy for the design of HER electrocatalyst via hollow designs and surface engineering.
文摘针对YOLOv8s模型在钢材表面缺陷检测任务中特征提取能力不足、特征融合不充分以及收敛速度慢、回归精度差等问题,提出一种基于改进YOLOv8s的钢材表面缺陷检测算法。首先,为了使模型关注更多维度的特征信息,将YOLOv8s模型主干网络和颈部网络中的部分C2f模块替换为C2f-Triplet模块;其次,为了使模型在更大的感知区域内聚合上下文信息,将YOLOv8s模型颈部网络中的最近邻上采样模块替换为内容感知特征重组(content-aware reassembly of features,CARAFE)上采样算子;最后,为了提高模型收敛速度和回归精度,将原YOLOv8s的CIoU回归损失函数替换为SIoU损失函数。实验结果表明:在NEU-DET数据集上,改进后的YOLOv8s钢材表面缺陷检测算法较原YOLOv8s算法精确率提高1.6百分点,平均精度均值提高2.2百分点。相比于目前主流的钢材表面缺陷检测算法,改进后的YOLOv8s钢材表面缺陷检测算法可以更加准确地检测出钢材表面缺陷的类别和位置,并且模型相对较小,便于在移动端部署。
文摘Let R be a ring and n be a positive integer.Then R is called a left n-C2-ring(strongly left C2-ring)if every n-generated(finitely generated)proper right ideal of R has nonzero left annihilator.We discuss some n-C2 and strongly C2 extensions,such as trivial extensions,formal triangular matrix rings,group rings and[D,C].
