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颈椎病医疗诊断专家系统CSFS的构成与实现

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微电子学与计算机 1989年第11期6卷 18-20页

作者：刘晓东王永庆张选平西安交通大学计算机系

我们研制的颈椎病医疗诊断专家系统CSES以知识工程和专家系统建造理论作指导,以正向推理为主要推理机制,用产生式规则表示领域专家知识。本文对CSES的实现作了系统的介绍。

关键词：颈椎病医疗诊断专家系统

A dry-electrode enabled ECG-on-Chip with arrhythmia-aware data transmission

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Science China(Information Sciences) 2025年

作者： Xinzi XU Yanxing SUO Yang ZHAO Peiyi ZHOU xiao HAN Qiao CAI Min WANG Jiajun YUAN Liebin ZHAO yongfu LI Guoxing WANG yong LIAN Department of Micro-Nano Electronics and MoE Key Lab of Artificial Intelligence Shanghai Jiao Tong University Pediatric AI Clinical Application and Research Center Shanghai Engineering Research Center of Intelligence Pediatrics (SERCIP) Child Health Advocacy Institute Shanghai Children's Medical Center School of MedicineShanghai Jiao Tong University Shanghai Engineering Research Center of Intelligence Pediatrics (SERCIP) Xin Hua Hospital Affiliate to Shanghai Jiao Tong University School of Medicine

Early detection and treatment of cardiovascular diseases (CVDs) can be significantly enhanced through the use of flexible wearable electrocardiogram (ECG) sensors, potentially reducing CVD-related mortality. This paper introduces an ECG-on-Chip (EoC) solution tailored for flexible ECG sensors, incorporating novel features to address common challenges in wearable ECG technology. The EoC integrates a chopper-stabilized capacitively-coupled instrumentation amplifier (CS-CCIA),ensuring a high common-mode rejection ratio (CMRR) and low noise performance. Performance is further boosted via a positive feedback loop (PFL) and a programmable gain amplifier (PGA) with shared on-chip calibration logic, which enhances input impedance and minimizes gain variability to ensure consistent algorithm performance. Additionally, a secondary chopping technique is employed to further reduce noise, achieving an input-referred noise level of 454 nVrms. The embedded algorithm within the EoC is designed to extract clinically meaningful features, facilitating robust real-time arrhythmia analysis. Fabricated using a 0.18μm CMOS process, the EoC consumes 14.9μW with a supply voltage of 1.2 V. The algorithm’s efficacy has been validated over 0.4 million heartbeats, demonstrating a sensitivity of over 99.7%for R-peak detection and 98.3%for arrhythmia analysis. To demonstrate practical application, the EoC has been integrated with a commercial Bluetooth low energy (BLE)transceiver, forming a wireless arrhythmia monitoring sensor equipped with dry electrodes. This system consumes 292.04μW in arrhythmia-aware transmission mode, supporting 13 days of operation with a 30 mAh thin-film battery.

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Modular assembly of complex C-alkyl glycoside enabled via cooperative NHC and photoredox catalysis

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Science China Chemistry 2025年

作者： Rui-Qiang Jiao Ming Li Xi Chen Mei-Ze Xu Tian Ding xiao-Ping Gong Zhuo-Mei Li Xue-Yuan Liu yong-Min Liang State Key Laboratory of Applied Organic Chemistry Lanzhou University College of Chemistry and Chemical Engineering Northwest Normal University

C-Alkyl glycosides are found in natural products and are indispensable in drug development programs,owing to their diverse range of medicinal ***-component reactions involving glycosyl radical addition are well documented and proved efficient for the C-alkyl glycosides ***,multicomponent reactions for the rapid and controllable construction of structurally diversified C-alkyl glycosides in a single step remains a significant challenge due to the issues associated with balancing reactivity,compatibility,and ***,we report an NHC and photoredox co-catalyzed three-component method to access complex and valuable C-alkyl *** protocol exhibits broad substrate scope and excellent chemoand ***,nine types of sugars are compatible with this *** addition,the generality of this catalytic strategy was further highlighted by the potential for scalable production,the feasibility of further modifications of the products and its successful application in the late-stage functionalization of pharmaceutical skeletons.

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Viscosity and structure relationship with equimolar substitution of CaO with MgO in the CaO–MgO–Al_(2)O_(3)–SiO_(2)slag melts

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 70-79页

作者： yong Hou Shuo Zhang Jie Dang Jia Guo Hanghang Zhou Xuewei Lü College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China

Currently,the Al_(2)O_(3)content in the high-alumina slag systems within blast furnaces is generally limited to 16wt%–18.5wt%,making it challenging to overcome this *** most studies that concentrated on managing the MgO/Al_(2)O_(3)ratio or basicity,this paper explored the effect of equimolar substitution of MgO for CaO on the viscosity and structure of a high-alumina CaO-MgO-Al_(2)O_(3)-SiO_(2)slag system,providing theoretical guidance and data to facilitate the application of high-alumina *** results revealed that the viscosity first decreased and then increased with higher MgO substitution,reaching a minimum at 15mol%MgO *** transform infrared spectroscopy(FTIR)results found that the depths of the troughs representing[SiO_(4)]tetrahedra,[AlO_(4)]tetrahedra,and Si-O-Al bending became progressively deeper with increased MgO *** of the Raman spectra showed that the average number of bridging oxygens per Si atom and the X_(Q^(3))/X_(Q^(2))(X_(Q^(i))is the molar fraction of Q^(i) unit,and i is the number of bridging oxygens in a[SiO_(4)]tetrahedral unit)ratio increased from 2.30 and 1.02 to 2.52 and 2.14,respectively,indicating a progressive polymerization of the silicate structure.X-ray photoelectron spectroscopy(XPS)results highlighted that non-bridging oxygen content decreased from 77.97mol% to 63.41mol% with increasing MgO concentration,whereas bridging oxygen and free oxygen contents *** analysis demonstrated a gradual increase in the polymerization degree of the tetrahedral structure with the increase in MgO ***,bond strength is another important factor affecting the slag *** occurrence of a viscosity minimum can be attributed to the complex evolution of bond strengths of non-bridging oxygens generated during depolymerization of the[SiO_(4)]and[AlO_(4)]tetrahedral structures by CaO and MgO.

关键词： aluminosilicate viscosity structure spectroscopy

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差压预冷设备的匹配研究

保鲜与加工 2007年第4期7卷 25-26页

作者：董小勇关文强刘斌天津商业大学制冷与空调工程系天津300134 国家农产品保鲜工程技术研究中心

通过对4种不同果蔬的预冷热负荷计算,分别得出了制冷机组压缩机所需功率与预冷时间、预冷质量的关系。在此基础上考虑到影响换热器的因素,计算出不同压缩机功率下冷凝器与蒸发器的面积。

关键词：田间热负荷换热面积制冷量差压预冷

Applying physics informed neural network for flow data assimilation

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Journal of Hydrodynamics 2020年第6期32卷 1050-1058页

作者： xiao-dong Bai yong Wang Wei Zhang Ministry of Education Key Laboratory of Coastal Disaster and Defence Hohai UniversityNanjing210098China Max Planck Institute for Dynamics and Self-Organization GöttingenGermany Science and Technology on Water Jet Propulsion Laboratory Marine and Research Institute of ChinaShanghai200011China

Data assimilation(DA)refers to methodologies which combine data and underlying governing equations to provide an estimation of a complex *** informed neural network(PINN)provides an innovative machine learning technique for solving and discovering the physics in *** encoding general nonlinear partial differential equations,which govern different physical systems such as fluid flows,to the deep neural network,PINN can be used as a tool for *** to its nature that neither numerical differential operation nor temporal and spatial discretization is needed,PINN is straightforward for implementation and getting more and more attention in the *** this paper,we apply the PINN to several flow problems and explore its potential in fluid *** the mesoscopic Boltzmann equation and the macroscopic Navier-Stokes are considered as physics *** first introduce a discrete Boltzmann equation informed neural network and evaluate it with a one-dimensional propagating wave and two-dimensional lid-driven cavity *** laminar cavity flow is also considered as an example in an incompressible Navier-Stokes equation informed neural *** parameterized Navier-Stokes,two turbulent flows,one within a C-shape duct and one passing a bump,are studied and accompanying pressure field is *** examples end with a flow passing through a porous *** in this paper show that PINN provides a new way for intelligent flow inference and identification,ranging from mesoscopic scale to macroscopic scale,and from laminar flow to turbulent flow.

关键词： Data assimilation(DA) deep learning physics informed neural network hydrodynamics

A strategy to control microstructures of a Ni-based superalloy during hot forging based on particle swarm optimization algorithm

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Advances in Manufacturing 2019年第2期7卷 238-247页

作者： dong-dong Chen yong-Cheng Lin xiao-Min Chen School of Mechanical and Electrical Engineering Central South University Changsha 410083 People's Republic of China State Key Laboratory of High Performance Complex Manufacturing Changsha 410083 People's Republic of China College of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 People's Republic of China

In this study, a strategy based on the particle swarm optimization (PSO) algorithm is developed to control the microstructures of a Ni-based superalloy during hot forging. This strategy is composed of three parts, namely, material models, optimality criterions, and a PSO algo rithm. The material models are utilized to predict microstructure information, such as recrystallization volume fraction and average grain size. The optimality crite? non can be determined by the designed target microstructures and random errors. The developed strategy is resolved using the PSO algorithm, which is an intelligent optimal algorithm. This algorithm does not need a derivable objective function, which renders it suitable for dealing with the complex hot forging process of alloy components. The optimal processing parameters (deformation temperature and strain rate) are obtained by the developed strategy and validated by the hot forging experiments. Uniform and fine target microstructures can be obtained using the optimized processing parameters, which indicates that the developed strategy is effective for controlling the microstructural evolution during the hot forging of the studied superalloy.

关键词： Processing parameters Microstructure Particle swarm optimization (PSO) algorithm Superalloy

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高性能透波陶瓷纤维的研究现状和展望

硅酸盐通报 2013年第2期32卷 274-279页

作者：邹春荣张长瑞肖永栋李斌王思青曹峰刘坤国防科学技术大学航天科学与工程学院新型陶瓷纤维及其复合材料重点实验室长沙410073 北京玻钢院复合材料有限公司北京102101

透波陶瓷纤维是制备陶瓷基透波复合材料的重要增强体,其耐高温性能已成为制约高马赫数导弹天线罩发展和应用的关键因素。本文综述了近年来新型耐高温透波陶瓷纤维包括氮化硅纤维、氮化硼纤维、硅氮氧纤维和硅硼氮纤维的研究进展,并对其... 详细信息

透波陶瓷纤维是制备陶瓷基透波复合材料的重要增强体,其耐高温性能已成为制约高马赫数导弹天线罩发展和应用的关键因素。本文综述了近年来新型耐高温透波陶瓷纤维包括氮化硅纤维、氮化硼纤维、硅氮氧纤维和硅硼氮纤维的研究进展,并对其未来的发展趋势作了展望。

关键词：透波纤维氮化硅纤维氮化硼纤维硅氮氧纤维硅硼氮纤维

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总体国家安全观视阈下科技安全概念诠释

北京理工大学学报（社会科学版） 2025年第1期27卷 162-173页

作者：肖君拥杨勇北京理工大学法学院北京100081

科技安全是国家安全的重要组成部分。理论概念的研究是分析和解决科技领域实践问题的基本方式,科技安全概念奠定了相关研究的理论基础、方法基础和范式基础,直接影响实践的具体方向。从科技安全的概念出发,梳理科技安全概念的理论嬗变... 详细信息

科技安全是国家安全的重要组成部分。理论概念的研究是分析和解决科技领域实践问题的基本方式,科技安全概念奠定了相关研究的理论基础、方法基础和范式基础,直接影响实践的具体方向。从科技安全的概念出发,梳理科技安全概念的理论嬗变过程。同时,进行简要评析,阐明科技安全相关实践。研究发现:通说概念采用与国家安全相关概念一致的定义方式,将科技安全的特性通过科技体系、技术要求、外部威胁、保障能力等方面具体化。此概念具有一定的合理性与必要性,但仍然存在对技术类型和国家利益的保障范围限缩化、对科技面临的威胁判断片面化、对保障科技安全状态的能力总结单一化等问题。在总体国家安全观视阈下准确定义科技安全概念,需要对通说概念进行必要修正,并从整体上理解科技安全概念的性质、前提与相关术语。

关键词：科技安全科技体系国家安全总体国家安全观国家利益