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An adjacent-effects resistant damper integrating control and measurement functions for duct systems

Building Simulation 2024年第12期17卷 2199-2212页

作者： Ruoyin Jing Ran Gao Song Nie Xinpeng Hao Changqing Yang Angui Li School of Building Services Science and Engineering Xi’an University of Architecture and TechnologyXi’anShaanxi 710055China China Railway Siyuan Survey and Design Institute Group Co. Ltd.WuhanChina

To ensure a comfortable building environment necessitates accurate measurement and control of air volume within duct systems to meet predetermined requirements for each *** eccentric torque dampers’measurement accuracy may be compromised by adjacent effects from local components,resulting in significant measurement *** solve this problem,the study combines CFD numerical simulation and full-scale experimental validation to derive a formula for controlling air volume within the dampers under operational *** on the formula,a novel torque damper is developed,capable of effectively controlling and accurately measuring air volume in duct *** linking the two blades,the damper resists the adjacent effects of local components(elbow,variable diameter,tee)on air volume measurements without the need for additional devices,ensuring a measurement error within±5.5%.Additionally,the novel dampers have lower resistance compared to traditional *** paper provides a reference for accurately measuring and effectively controlling air volume,while also maximizing the potential benefits of multi-leaf dampers.

关键词： ventilation air volume adjacent effects flow coefficient control and measurement

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Mechanical performance of 22SiMn2TiB steel welded with lowtransformation- temperature filler wire and stainless steel filler wire

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Journal of Iron and Steel Research International 2024年第4期31卷 967-981页

作者： Zi-dong Lin Kai-jie Song Zhen Sun Zi-qian Zhu Xue-feng Zhao Constantinos Goulas Wei Ya Xing-hua Yu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China Department of Design Production and Management Faculty of Engineering Technology.University of TwenteEnschede 7500 AETheNetherlands Rotterdam Additive Manufacture Fieldlab(RAMLAB) Rotterdam 3089 JWTheNetherlands

TX-80 low-transformation-temperature(LTT)welding wire was used to replace the traditional ER 307Si welding wire to realize the connection of 22SiMn2TiB armor steel in manual overlay *** previously existing issues,such as welding cracks,large welding deformation,and severe welding residual stress,were solved to ensure good strength and ductility *** particular,with the same welding conditions,TX-80 LTT wire eliminates welding *** reduces the welding deformation no matter the base pretreatment of pre-setting angle or no pre-setting *** comparison,it was found that the microstructure at the TX-80 weld is mainly composed of martensite and a small amount of retained *** contrast,the microstructure of the ER 307Si weld consists of a large amount of austenite and a small amount of skeleton-like *** variation trend of residual stress and microhardness from the weld to the base were investigated and compared with the mechanical properties of base *** TX-80 and the ER 307Si tensile samples elongation is 6.76%and 6.01%,while the ultimate tensile strengths are 877 and 667 MPa,*** average impact toughness at room temperature of the ER 307Si weld is 143.9 J/cm^(2),much higher than that of the TX-80 weld,which is only 36.7 J/cm^(2).The relationship between impact and tensile properties with microstructure species and distribution was *** addition,the fracture surface of the tensile and the impact samples was observed and *** dimples,fewer pores,larger radiation zone,and shear lips of TX-80 samples indicate better tensile ductility and worse impact toughness than those of ER 307Si weld.

关键词： Low-transformation-temperature material 22SiMn2TiB steel Welding deformation Residual stress Martensitic transformation Mechanical property

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Human thermal comfort in non-uniform thermal environments:A review

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Energy and Built Environment 2024年第6期5卷 853-862页

作者： Xiaowen Su Yanping Yuan Zhaojun Wang Wei Liu Li Lan Zhiwei Lian School of Mechanical Engineering Southwest Jiaotong UniversityChengduChina 610031 School of Architecture Harbin Institute of TechnologyHarbinChina 150006 Department of Architecture School of DesignShanghai Jiao Tong UniversityShanghaiChina

Thermal comfort is critical for ensuring the health and productivity of occupants and knowing their thermal demand could help creat a satisfying environment with the least energy *** of thermal comfort is built based on experimental studies in uniform and stable environments,while there is still a gap when applying in evaluating human thermal comfort in non-uniform thermal ***,an insight into human thermal comfort in non-uniform thermal environments is *** fundamental studies of thermal comfort in non-uniform thermal environments are explicated,including thermal comfort theory applied in non-uniform thermal environments,types of non-uniform thermal environments and corresponding studies,physiological and psychological thermal responses in the ***,the evaluation indices of non-uniform thermal environments are classified according to their definitions and the comfort models are ***,future works in this research field are *** general,the overall thermal comfort and local thermal comfort should be both taken into account in non-uniform thermal environments where skin temperatures and psychological thermal responses of occupants are different among local body ***,as studies of local thermal comfort are mainly conducted in thermally neutral condition,the limits considering the state deviating thermal neutrality(slightly warm or cool),which is frequently found in reality,are encouraged to be ***,a well-defined comprehensive index should be proposed considering heat exchange of human body with their microenvironments and thus the comfort range of the index could be provided for designing of non-uniform thermal environments.

关键词： Local thermal comfort Non-uniform thermal environment Comfort theory Thermal response Evaluation indices

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Effects of Age-Related Decline on the Acoustic Characteristics of Daily Conversation 13

Effects of Age-Related Decline on the Acoustic Characteristi...

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13th IEEE Global Conference on Consumer Electronic, GCCE 2024

作者： Wakita, Yumi Iida, Atsuteru Osaka Institute of Technology Graduate School of Robot and System Engineering System Design Osaka Japan

ISBN: (纸本)9798350355079

To develop a method for estimating age-related decline using the analysis of daily conversation characteristics of elderly individuals, we compared the conversation traits of elderly people living in serviced housing with those living independently at home. Our analysis revealed that elderly individuals in serviced housing exhibited higher average and standard deviation (SD) values of F0 per utterance. Additionally, their speech recognition results showed significantly higher word error rates, with frequent instances where utterances spanning multiple words were misrecognized as entirely different word sequences. The log-mel spectrogram of misrecognized parts were often more unstable and ambiguous compared to those of elderly individuals living independently. n the paper, we discuss the usefulness of these characteristics for distinguishing between elderly individuals residing in serviced housing and those living independently. © 2024 IEEE.

关键词： Speech recognition

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A numerical method for predicting bursting strength of composite rocket motor case considering filament winding process-induced stress

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Chinese Journal of Aeronautics 2025年第2期38卷 505-518页

作者： Jiqiu LIANG Fei ZHAO Dan WU Anxin DING Hubei Key Laboratory of Advanced Aerospace Propulsion Technology Wuhan 430040China System Design Institute of Hubei Aerospace Technology Academy Wuhan 430040China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

A numerical method to predict the bursting strength of filament wound composite rocket motor case is proposed *** method can evaluate the longitudinal stress evolution of each composite layer as impregnated filaments with fiber tension are wound layer by layer,and consider the effects of accumulated stress and deformation during filament winding on the bursting strength of composite ***∅520 mm composite cases as a case study,the filament-winding-process-induced stress and deformation as well as progressive damage behavior are numerically predicted,followed by a comparison with experimental *** numerical results show that the predicted bursting pressures for composite cases manufactured on the mandrels with and without a flexible component are 14.20 MPa and 21.40 MPa,*** values exhibit slight deviation from the measured pressures of 13.50 MPa and 21.57 ***,the predicted damage locations,situated respectively in the dome and cylinder,agree well with the experimental *** observations indicate that use of flexible component reduces the load-bearing capacity of the ***,it validates the reliability and accuracy of the proposed numerical method in predicting the bursting strength of composite cases.

关键词： Composite case Fiber tension Bursting strengt hProgressive damage analysis Filament winding

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Quantum Secure Email Communication for Phishing Prevention 7

Quantum Secure Email Communication for Phishing Prevention

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7th IEEE Pune Section International Conference, PuneCon 2024

作者： Chandre, Pankaj Sontakke, Palash Patil, Rajkumar Shendkar, Bhagyashree D Dhotre, Dhanraj Vanarote, Viresh Mit Art Design and Technology University Mit School of Computing Department of Computer Science and Engineering Pune India Mit Art Design and Technology University Mit School of Computing Department of Information Technology Pune India

ISBN: (纸本)9798331527822

The rise of sophisticated phishing attacks has necessitated stronger security measures for email communication, especially in sensitive environments. This paper proposes a Quantum Secure Email Communication Framework designed to prevent phishing by integrating Quantum Key Distribution (QKD) with traditional email security mechanisms. The framework leverages quantum keys to encrypt email communication, ensuring that only legitimate users with the correct quantum key can send and receive secure emails. The architecture also incorporates a Phishing Detection Engine that validates email content and sender information using quantum-encrypted keys, alerting users to potential phishing threats. The system operates through the secure exchange of quantum keys between the sender's email server and the user via a QKD Channel, with quantum encryption applied to secure outgoing and incoming emails. In parallel, the phishing detection module analyses all email traffic for signs of malicious activity, using a QKD-based Email Validator to confirm the legitimacy of emails. This hybrid approach ensures both the privacy of communication and the proactive detection of phishing attempts, offering a robust defense mechanism in the increasingly hostile landscape of digital communication. © 2024 IEEE.

关键词： Phishing

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Multi-layer quasi-zero-stiffness meta-structure for high-efficiency vibration isolation at low frequency

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Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1189-1208页

作者： Jiahao ZHOU Jiaxi ZHOU Hongbin PAN Kai WANG Changqi CAI Guilin WEN College of Mechanical and Vehicle Engineering Hunan UniversityChangsha410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body The Ministry of Science and TechnologyChangsha410082China School of Mechanical Engineering Zhejiang Sci-Tech UniversityHangzhou310018China School of Mechanical Engineering Yanshan UniversityQinhuangdao066004Hebei ProvinceChina

An easily stackable multi-layer quasi-zero-stiffness(ML-QZS)meta-structure is proposed to achieve highly efficient vibration isolation performance at low ***,the distributed shape optimization method is used to design the unit cel,i.e.,the single-layer QZS(SL-QZS)***,the stiffness feature of the unit cell is investigated and verified through static ***,the unit cells are stacked one by one along the direction of vibration isolation,and thus the ML-QZS meta-structure is ***,the dynamic modeling of the ML-QZS vibration isolation metastructure is conducted,and the dynamic responses are obtained from the equations of motion,and verified by finite element(FE)***,a prototype of the ML-QZS vibration isolation meta-structure is fabricated by additive manufacturing,and the vibration isolation performance is evaluated *** results show that the vibration isolation performance substantially enhances when the number of unit cells *** importantly,the ML-QZS meta-structure can be easily extended in the direction of vibration isolation when the unit cells are properly ***,the ML-FQZS vibration isolation meta-structure should be a fascinating solution for highly efficient vibration isolation performance at low frequency.

关键词： quasi-zero stiffness(QZS) meta-structure high efficiency low frequency vibration isolation

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Tamper-forgery Image Detection in Security Digital Image: A Review 3

Tamper-forgery Image Detection in Security Digital Image: A ...

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3rd IEEE International Conference on Blockchain and Distributed Systems Security, ICBDS 2024

作者： Thorat, Nilesh N. Dhotre, Prashant Kulal, Nilesh Pimpalkar, Aarti P Patil, Vijaya S. Kolekar, Sachin M. Mit Art Design and Technology University Mit School of Computing Computer Science & Engineering Department Pune India Mit Art Design and Technology University Mit School of Computing Information Technology Department Pune India

ISBN: (纸本)9798350354348

Concerns with image security exist in every sector that uses digital photographs. Historically, public safety and forensics have depended on images from the crime scene, biometric photos, suspect photos, and other sources. With the development of digital imaging, there has been a significant increase in the use of digital images in this field. Although the use of digital image processing has led to the creation of several new forensic methods of inquiry, it has also simplified picture modification. Digital picture validity is an issue since several snipping and image alteration programs are freely available to the public. It serves as solid proof in many different types of crimes and is utilized as documentation for many purposes. Creating and modifying photos has become easier and more accessible with the development of image manipulation and editing tools. The two most common methods of photo counterfeiting are copy-and-move forgery and image splicing. An image can be spliced, or combined from two photos, to hide or show an error scenario. A section of a picture can be copied and pasted into another image. The many kinds of digital image frauds are examined in this study along with software that detects them. An analysis was done on the methods currently in use for spotting phony photos. © 2024 IEEE.

关键词： Anonymity

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Construction of User Portrait System for Online Shopping of Cultural and Tourism Products Based on Generalized Regression Neural Network

Construction of User Portrait System for Online Shopping of ...

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2023 International Symposium on design Studies and Intelligence engineering, DSIE 2023

作者： Xu, Yue Hu, Xuyan Zhang, Jiande School of art and design Nanjing Institute of Technology Nanjing211167 China School of computer Engineering Nanjing Institute of Technology Nanjing211167 China

ISBN: (纸本)9781643684888

In response to the development dilemma of product similarity and singularity in the cultural and tourism market, the system constructs a user portrait system which is based on Generalized Regression Neural Network (GRNN). It aims to improve the accuracy of user portrait for online shopping of cultural and tourism products, and make judgments on the visualization, intelligence, digitization, and development trends of cultural and tourism network services. The study summaries four types of user demand elements through traditional questionnaires and AHP analytic hierarchy process. It forms a hierarchical model for user portrait system analysis. The study integrates user online shopping process data into the design and analysis process, and combines GRNN to intelligently analyze the target users, makes the analysis results of the software more objective and reasonable. It provides reference and decision-making for the cultural and tourism market, platform, product development, and service optimization. © 2024 The Authors.

关键词： Analytic hierarchy process

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Black Cotton Soil Stabilization by Using Bio-enzyme and Marble Dust Powder for Pavement Subgrade 1

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International Conference on Sustainable Infrastructure: Innovation, Opportunities and Challenges, SIIOC 2023

作者： Gayakawad, Aishwarya P. Rathod, Rajshekhar Sonawane, Sagar K. Department of Civil Engineering School of Engineering and Sciences MIT Art Design and Technology University Maharashtra Pune412201 India

ISBN: (数字)9789819748525

ISBN: (纸本)9789819748518

Black cotton soils (BCSs), characterized by their susceptibility to vertical ground movements and their detrimental impact on geotechnical structures and pavements, present significant challenges. These issues are particularly pronounced in areas with subpar subgrade soils, rendering conventional pavement construction economically prohibitive. To meet this pressing need, there is a growing shift toward investigating non-traditional, sustainable, and cost-effective solutions. Regrettably, there is a scarcity of research concerning the reaction mechanisms underlying non-traditional soil stabilization methods. In response, this study explores the potential of marble dust (MD) as a soil stabilizer and bio-enzyme (BE), an environmentally friendly and non-toxic liquid enzyme that expedites soil stabilization during construction. The study's primary objectives encompass the assessment of key geotechnical parameters such as compaction, Atterberg's limits, and Unconfined Compressive Strength while varying the proportions of marble dust and bio-enzyme. Furthermore, it employs microstructural-driven analytical techniques to investigate the reaction mechanisms driving this innovative soil stabilization approach. The findings offer promising prospects for mitigating the expansion of reactive soils and promoting sustainable solid waste management practices. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Waste management

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