检索结果-内蒙古大学图书馆

An expandable chamber for safe brain retraction: new technologies in the field of transcranial endoscopic surgery

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2023年第4期24卷 326-335页

作者： Elena ROCA Anna GOBETTI Giovanna CORNACCHIA Oscar VIVALDI Barbara BUFFOLI Giorgio RAMORINO Head and Neck Department NeurosurgeryIstituto Ospedaliero Fondazione Poliambulanza25124 BresciaItaly Technology for Health PhD Program University of Brescia25124 BresciaItaly Materials Science and Technology at Department of Mechanical and Industrial Engineering University of Brescia25123 BresciaItaly Metallurgy at Department of Mechanical and Industrial Engineering University of Brescia25123 BresciaItaly Anatomy and Physiopathology Division Department of Clinical and Experimental SciencesUniversity of Brescia25123 BresciaItaly

Neurosurgery is a highly specialized field:it often involves surgical manipulation of noble structures and cerebral retraction is frequently necessary to reach deep-seated brain *** are still no reliable methods preventing possible retraction *** objective of this study was to design work chambers well suited for transcranial endoscopic surgery while providing safe retraction of the surrounding brain *** chamber is designed to be inserted close to the intracranial point of interest;once it is best placed it can be *** should guarantee an appreciable workspace similar to that of current neurosurgical *** experimental aspect of this study involved the use of a force sensor to evaluate the pressures exerted on the brain tissue during the retraction *** pterional craniotomy,pressure measurements were made during retraction with the use of a conventional metal spatula with different *** that,although the force values necessary for retraction and exerted on the spatula by the neurosurgeon are the same,the local pressure exerted on the parenchyma at the edge of the spatula at different inclinations varied greatly.A new method of cerebral retraction using a chamber retractor(CR)has been designed to avoid any type of complication due to spatula edge overpressures and to maintain acceptable pressure values exerted on the parenchyma.

关键词： Brain retraction Spatula Brain retractor design Brain retraction injury Retraction complication Transcranial endoscopic surgery

来源：评论

学校读者我要写书评

暂无评论

Key fuel characteristics and techno-economic aspects of torrefied rubberwood biomass pellets produced by incorporating various cassava-based binders at varied doses

引用

Environmental Science and Pollution Research 2024年第25期31卷 37663-37680页

作者： Kongto, Pumin Palamanit, Arkom Chaiprapat, Sumate Tippayawong, Nakorn Khempila, Jarunee Ruangim, Panatda Energy Technology Program Department of Interdisciplinary Engineering Faculty of Engineering Prince of Songkla University 15 Kanjanavanich Rd. Songkhla Hat Yai90110 Thailand Research Center Faculty of Engineering Prince of Songkla University 15 Kanjanavanich Rd. Songkhla Hat Yai90110 Thailand Department of Civil and Environmental Engineering Faculty of Engineering Prince of Songkla University 15 Kanjanavanich Rd. Songkhla Hat Yai90110 Thailand Department of Mechanical Engineering Chiang Mai University 239 Huay Kaew Rd. Chiang Mai Muang District 50200 Thailand Physics Program Faculty of Science and Technology Rajabhat Maha Sarakham University 80 Nakhon Sawan Rd. Maha Sarakham Mueang District 44000 Thailand

Improving energy content and hydrophobic nature of woody biomass can be pursued through torrefaction. This gives torrefied biomass with a low bulk density, potentially increasing storage and transport costs. To overcome this issue, densifying the torrefied biomass is necessary. However, poor binding of particles makes densification challenging without using a binder. Therefore, the aim of this study was to investigate the physicochemical characteristics and techno-economic aspects of torrefied rubberwood biomass (TRWB) when pelletized using various cassava-based binders at different blending ratios. The selected binders included cassava starch (CS), cassava pulp (CP), and cassava chip (CC). Each binder at 5%, 10%, or 15% (wt.) was mixed with TRWB and water before pelletizing using a flat die machine. The results revealed that pelletizing TRWB with different cassava-based binders at various blending ratios influenced the physicochemical characteristics of the TRWB pellets, particularly dimensions, bulk density, fuel and atomic ratios, and energy content. The TRWB pellets demonstrated energy densities in the range of 7.95–11.39 GJ/m3, and their mechanical durability and fine content fell within acceptable ranges. The TRWB pellets maintained their shape during 120 min of water soaking, with water absorption levels varying by binder dose. The pelletizing ability, material, and energy costs of TRWB pellets depend on binder type and dose. CP can be applied as a binder for pelletizing torrefied rubberwood biomass. However, the mechanical durability of the product needs to be above the user requirement or standard. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Pelletizing

来源：评论

学校读者我要写书评

暂无评论

The Centrifugal Nuclear Thermal Rocket: Foundations, Challenges, and Progress

The Centrifugal Nuclear Thermal Rocket: Foundations, Challen...

引用

AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Thomas, Dale Houts, Michael Wang, Dean Hollingsworth, Keith Frederick, Robert Cassibry, Jason Department of Industrial & Systems Engineering and Engineering Management The University of Alabama in Huntsville HuntsvilleAL35899 United States Space Nuclear Propulsion Program Office NASA Marshall Space Flight Center HuntsvilleAL35812 United States Department of Mechanical & Aerospace Engineering The Ohio State University ColumbusOH43210 United States Department of Mechanical & Aerospace Engineering and Interim Dean of the Honors College The University of Alabama in Huntsville HuntsvilleAL35899 United States Department of Mechanical & Aerospace Engineering Propulsion Research Center The University of Alabama in Huntsville HuntsvilleAL35899 United States Department of Mechanical & Aerospace Engineering The University of Alabama in Huntsville HuntsvilleAL35899 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

The Centrifugal Nuclear Thermal Rocket (CNTR) is a Nuclear Thermal Propulsion (NTP) concept designed to heat propellant directly by the reactor fuel. The primary difference between the CNTR concept and traditional NTP systems is that rather than using traditional solid fuel elements, the CNTR uses liquid fuel with the liquid contained in rotating cylinders by centrifugal force. If the concept can be successfully realized, the CNTR would have a high specific impulse (up to 1800 s) at high thrust, which may enable (i) viable near-term human Mars exploration by reducing round-trip times to 420 days and (ii) direct injection orbits for scientific rendezvous missions to the Solar System outer planets and Kuiper Belt objects. Research is presently underway to determine resolutions for the significant engineering challenges that the CNTR concept presents. These challenges, the study plans to address them, and progress have been described previously;this paper provides an update on progress to date for the overall research effort, including strategies and key results on revision of a reference configuration, definition of key parameters which allows integration of the results of various analyses, and reviews strategies to mitigate the problem of Uranium vapor saturating the propellant exhaust and significantly impacting the CNTR’s specific impulse. Analyses and experiments, both underway and planned, to update estimates of engine key performance parameters including specific impulse, thrust and thrust to weight ratio along with the identification of selected design margins within the engine itself are described – all toward the goal of enabling plans for a laboratory demonstration of a single Centrifugal Fuel Element. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Rockets

来源：评论

学校读者我要写书评

暂无评论

mechanically-Inflatable Bio-Inspired Locomotion for Robotic Pipeline Inspection

Mechanically-Inflatable Bio-Inspired Locomotion for Robotic ...

引用

IEEE International Conference on Soft robotics (RoboSoft)

作者： Mostafa A. Atalla Fabian Trauzettel Sebastiaan P. van Gelder Paul Breedveld Michaël Wiertlewski Aimée Sakes Department of BioMechanical Engineering Faculty of Mechanical Engineering Delft University of Technology The Netherlands Department of Cognitive Robotics Faculty of Mechanical Engineering Delft University of Technology The Netherlands

Pipelines, vital for fluid transport, pose an important yet challenging inspection task, particularly in small, flexible biological systems, that robots have yet to master. In this study, we explored the development of an innovative robot inspired by the ovipositor of parasitic wasps to navigate and inspect pipelines. The robot features a flexible locomotion system that adapts to different tube sizes and shapes through a mechanical inflation technique. The flexible locomotion system employs a reciprocating motion, in which groups of three sliders extend and retract in a cyclic fashion. In a proof-of-principle experiment, the robot locomotion efficiency demonstrated positive linear correlation (r = 0.6434) with the diameter ratio (ratio of robot diameter to tube diameter). The robot showcased a remarkable ability to traverse tubes of different sizes, shapes and payloads with an average of (70%) locomotion efficiency across all testing conditions, at varying diameter ratios (0.7 ~ 1.5). Furthermore, the mechanical inflation mechanism displayed substantial load-carrying capacity, producing considerable holding force of (13 N), equivalent to carrying a payload of (≈5.8 Kg) inclusive the robot weight. This soft robotic system shows promise for inspection and navigation within tubular confined spaces, particularly in scenarios requiring adaptability to different tube shapes, sizes, and load-carrying capacities. The design of this system serves as a foundation for a new class of pipeline inspection robots that exhibit versatility across various pipeline environments, potentially including biological systems.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The Effect of Blade Arc Angle on the Performance of Gravitational Water Vortex Turbine: Case Study on Type-L Blade Runner 7th

The Effect of Blade Arc Angle on the Performance of Gravitat...

引用

7th International Conference and Exhibition on Sustainable Energy and Advanced Material, ICE-SEAM 2021

作者： Handoko, Rieky Hadi, Syamsul P. T, D. Danardono Dwi Prasetyo, Ari Graduate Program of Mechanical Engineering Department Universitas Sebelas Maret Surakarta Indonesia Mechanical Engineering Department Universitas Sebelas Maret Surakarta Indonesia

ISBN: (纸本)9789811931789

The flow of rivers and lakes that flow throughout the year has the potential for developing water energy in the world. Dams to make heads are needed as a hydroelectric power plant that can cause environmental and ecological changes, disrupt river flow and even local population migration. The application of microhydro power plants is one of the efforts to overcome this problem. Gravitational Water Vortex Turbine (GWVT) is a relatively new technology in the field of microhydro power generation and is still in the process of being developed to obtain maximum turbine power values. The blade shape research has been carried out using the experimental method in this study. The research was conducted using a water tunnel with a cone type basin to create a water vortex with three variations of water discharge. Design and testing of prototype L-type runners with variations of three blade angles;75°, 90°, 105°, the inclination of the blade to the vertical axis of 60°, and the number of blades 5 have been completed in this study. The results showed that the L runner with an blade arc angle of 90° produced the highest turbine power followed by a blade angle of 75° and 105°. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Vortex flow

来源：评论

学校读者我要写书评

暂无评论

Bearing Fault Diagnosis in Induction Motor Using Hybrid CNN Model 2nd

Bearing Fault Diagnosis in Induction Motor Using Hybrid CNN ...

引用

2nd International and 14th National Conference on Industrial Problems on Machines and Mechanisms, IPRoMM 2022

作者： Kumar, Prashant Hati, Ananda Shankar Prince Kim, Heung Soo Department of Mechanical Robotics and Energy Engineering Dongguk University-Seoul 30 Pildong-ro 1-gil Jung-gu Seoul04620 Korea Republic of Jharkhand Dhanbad826004 India

ISBN: (纸本)9789819942695

Induction motors (IMs) are the prime movers for the industries. The availability of an efficient electrical drive has aided in the widespread application of IMs in different sectors, including mining, cement, textile, and many more. Bearings are the critical components of the motors. The bearing failure may cause severe accidents and production losses. The timely detection of the bearing fault is essential for the minimum downtime. Researchers have used conventional machine learning techniques for the bearing fault detection in motors. However, these approaches require input features, and selecting efficient features poses a big challenge. Deep learning (DL) algorithms have recently captured the interest of researchers all over the world. DL algorithms like convolutional neural networks (CNNs) can automatically execute feature extraction and selection. This paper proposes a hybrid CNN-based model in combination with support vector machine for bearing fault detection in IMs. Various bearing faults, such as inner race fault, outer race fault, and ball defect, have been considered in the proposed work. The proposed method has efficiently detected various bearing faults. The proposed approach has achieved a mean accuracy of more than 99%. Python was used for all of the analysis and programming. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Induction motors

来源：评论

学校读者我要写书评

暂无评论

Novel Disturbance Observer Relevant Parametric System Identification Based on Robust Stability Criterion

Novel Disturbance Observer Relevant Parametric System Identi...

引用

2023 IEEE Conference on Control Technology and Applications, CCTA 2023

作者： Jung, Hanul Tacx, Paul Oomen, Tom Oh, Sehoon Dgist Department of Robotics Engineering Daegu42988 Korea Republic of Eindhoven University of Technology Control Systems Technology Group Department of Mechanical Engineering P.O. Box 513 Eindhoven5600 MB Netherlands

ISBN: (纸本)9798350335446

In this paper, novel parametric identification is addressed by the disturbance observer (DOB) relevant algorithm. To fully utilize the disturbance observer, a proper nominal model, which is a parametric model, is essential. The control performance of the DOB can be checked based on the robust stability criterion, which is related to the modeling error and the desired bandwidth of the DOB. Consequently, it is beneficial to evaluate the parametric model in the system identification procedure. Therefore, this paper proposes a novel disturbance observer-relevant system identification algorithm based on the robust stability criterion of the disturbance observer. The effectiveness of the proposed method is validated by showing the numerical simulations under specific conditions. © 2023 IEEE.

关键词： Stability criteria

来源：评论

学校读者我要写书评

暂无评论

Implementation of structurally pre-stressed piezo actuator based active vibration isolation system for micro milling

Implementation of structurally pre-stressed piezo actuator b...

引用

4th International Conference on Smart and Sustainable Developments in Materials, Manufacturing and Energy engineering, SME 2022

作者： Divijesh, P.P. Rao, Muralidhara Rao, Rathnamala Jain, Nirmith Prabhu, Prasad Department of Mechanical Engineering NMAM Institute of Technology Nitte India Department of Robotics and AI NMAM Institute of Technology Nitte India Department of Electronics and Communication NITK Surathkal India

This paper presents the implementation of a structurally pre-stressed piezo actuator based active vibration isolation system incorporated with tool based micromachining setup for analyzing and comparing the milled pocket depth surface before and after isolation. A carbide micro end mill tool with 1 mm diameter and 4 flutes has been used for carrying out pocket milling experiments with and without vibrations on copper work pieces having 3 mm thickness. The machining parameters selected were spindle speed of 16,000 rev/min with 64 mm/min feed rate and 50 lm depth of cut. Two sets of pocket milling experiments were carried out using the proposed vibration isolation setup one with vibration and the other without vibration. In the first set of experiment, the source actuator was actuated for generating vibrations during pocket milling whereas in the second set of experiment, both source and isolator actuators were actuated for nullifying the vibrations generated during pocket milling. The macroscopic lens output images of the pocket depth surfaces before and after isolation were then compared corresponding to various actuation voltages at different frequencies using the proposed vibration isolation setup. Based on the macroscopic lens output images it was observed that the milled pocket depth surface obtained by actuating only source actuator showed distinct rings wherein the ring count matched with frequency and feed rate that has been provided during machining. However, the milled pocket obtained by actuating both source and isolator actuators resulted in surface characteristics with less pronounced rings similar to that of regular machining. Also the rings that has been formed showed more defined edges with the increase in actuator voltage indicating that these distinct patterns were caused due to the vibrations generated by the source actuator alone and not other factors. Copyright © 2023 Elsevier Ltd. All rights reserved.

关键词： Actuators

来源：评论

学校读者我要写书评

暂无评论

Embodied Co-Reflection: Enhancing Fitness Data Reflection through the Integration of Embodied Interaction and Narrative Feedback

Embodied Co-Reflection: Enhancing Fitness Data Reflection th...

引用

2025 CHI Conference on Human Factors in Computing Systems, CHI EA 2025

作者： Imai, Atsuhiro Misaki, Daigo Graduate School of Engineering Mechanical Engineering Program Human Interface Lab. Kogakuin University Shinjuku-Ku Tokyo Japan Faculty of Engineering Department of Mechanical Systems Engineering Human Interface Lab. Kogakuin University Shinjuku-Ku Tokyo Japan

ISBN: (纸本)9798400713958

Many fitness trackers monitor physical activity by presenting data such as heart rate and step count in numerical or graphical formats. However, these methods often fail to connect the data with users’ subjective bodily sensations, making it challenging for users to perceive the information as personally relevant. To address this issue, this study proposes a reflective system that integrates embodied interaction with voice narrative feedback. The system utilizes the body as a reference frame for fitness data and presents health information in a story-like format. Results from user studies indicate that the proposed system significantly improves engagement (aesthetic appeal, reward factors) and reduces cognitive load (satisfaction, frustration), showing moderate to large effect sizes. It also strengthens the connection between users and their data. This approach demonstrates the potential to overcome the limitations of traditional fitness trackers, offering a novel and immersive reflective experience in the healthcare and fitness domains. © 2025 Copyright held by the owner/author(s).

关键词： Embodied Interaction Fitness Data Reflection Human-Computer Interaction Large Language Models User Engagement Voice Feedback

来源：评论

学校读者我要写书评

暂无评论

Inpatient Monitoring System: Temperature, Oxygen Saturation, Blood Pressure, Heart Rate, and Infusion Automation Based on ESP 32, IoT, and Mobile Application

Inpatient Monitoring System: Temperature, Oxygen Saturation,...

引用

International Conference of Computer and Informatics engineering (IC2IE)

作者： Irvanda Joseph Patrick Anthony Winda Astuti Zener Sukra Lie Mahmud Iwan Solihin Automotive and Robotics Program Computer Engineering Department BINUS ASO School of Engineering Bina Nusantara University Jakarta Indonesia Department of Mechanical & Mechatronics Engineering UCSI University Kuala Lumpur Malaysia

ISBN: (数字)9798331505530

ISBN: (纸本)9798331505547

The implementation of a patient monitoring system and infusion automation which aims to ensure regular and periodic monitoring of inpatient conditions are applied in this system. This embedded system is applied in hospitals and addresses the uneven distribution of healthcare workers in Indonesia, particularly in remote areas. Currently, manual checks by nurses can lead to errors and reduced patient comfort. The improvement supervision is developed in this work. The system monitored body temperature, oxygen saturation, blood pressure, heart rate, and automated infusions. All the embedded systems are connected to Internet of Things (IoT) and a real-time database accessible through an application and web. This system allows doctors and hospital authorities to make decisions based on patient condition history. The testing phase of the system shows four data acquisition devices (temperature, oxygen saturation, blood pressure, and heart rate), an ESP 32, and Firebase as a database, have ability to capture and send real-time data every five seconds and can be accessed by doctors, patients, and hospital authorities.

关键词： Heart rate Temperature sensors Temperature measurement Automation Hospitals Databases Blood pressure Real-time systems Biomedical monitoring Testing

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：