دانلود و نمایش مقالات مرتبط با Measurement::صفحه 9
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نتیجه جستجو - Measurement

تعداد مقالات یافته شده: 725
ردیف عنوان نوع
81 Precision biometrics data of Atlantic salmon (Salmo salar L:) in commercial grow-out sea-cages: Manual sampling and infrared diode frames compared to processing plant
داده های دقیق بیومتریک ماهی قزل آلای سالمون (Salmo salar L:) در قفس های تجاری تجاری بزرگ دریایی: نمونه گیری دستی و قاب های دیود مادون قرمز در مقایسه با پردازش کارخانه-2021
One of the critical challenges that the global salmon farming industry will confront when upscaling production is accurate biomass control. Commercial salmon farming requires a significant level of certainty regarding fish count, average weight measurement, live weight distribution, and other production indicators. A reliable control system for assessing the biomass of farmed Atlantic salmon is essential for sustainable and cost-effective precision aquaculture. A study was done in four production sea-cages in a Chilean Atlantic salmon marine grow-out farm to estimate the average weight and frequency distribution utilizing the Vaki Biomass daily® diode frames as an alternate technology to manual weight measurement. From post-smolt reception to fish harvest, diode frames were put in each sea-cage in a secure position for 15 months. There were no significant changes in length or average weight between manual sampling and frame estimate. The mean degree of accuracy for the average weight estimation was 98.83 % for the frames utilized in the four sea cages. The diode frames also achieved a high degree of precision in predicting the frequency distribution of fish. There were no statistically significant variations between the distribution variances of the diode frame measurements and the distribution variances of the fish received at the fish processing facility (FPF). The maximum difference between the average weight calculated by the frames and the average weight of the fish received in the processing facility was 2.4 %, with99.66 % being the highest accuracy with only 19 g of difference. We determined that diode frames might replace manual weight assessments with greater reliability for growth monitoring and production management. To assure the optimal performance of the diode frames in terms of accuracy and precision for future commercial- scale validations in the salmon farming business, the development of a standard best practice manual is necessary.
Keywords: Diode frame | Accuracy | Precision fish farming | Biomass | Weight distribution
مقاله انگلیسی
82 Experimental investigation of structural system capacity with multiple fatigue cracks
بررسی تجربی ظرفیت سیستم ساختاری با ترک های خستگی متعدد-2021
Few experimental data sets exist in the literature to support the development and evaluation of digital twins predicting structural degradation. The literature is especially sparse for system tests where multiple failures occur and interact. In this work, a laboratory-level experiment is conducted to mimic many of the properties of larger and more complex marine structures with redundant load paths, failure interaction, and component-to-system level integration. In the experiment, such properties are reflected by a hexagon tension specimen with four propagating fatigue cracks tested under displacement-controlled loading. The applied loading cycles and corresponding crack lengths are recorded as the major time-varying data of degradation, with the resisting force at maximum extension used as the system capacity. A novel computer vision method is used to measure the crack length. Strain gauges are also used to monitor the structure’s status. The experimental data is presented and analyzed in this paper. The resulting data sets can be used to evaluate the performance of different digital twin updating approaches.
Keywords: Fatigue test | Laboratory scale | Multi-degradation | Marine structures | Crack length measurement
مقاله انگلیسی
83 Biometric recognition using wearable devices in real-life settings
تشخیص بیومتریک با استفاده از دستگاه های پوشیدنی در تنظیمات واقعی-2021
The popularity of wearable devices, such as smart glasses, chestbands, and wristbands, is nowadays rapidly growing, thanks to the fact that they can be used to track physical activity and monitor users’ health. Recently, researchers have proposed to exploit their capability to collect physiological signals for enabling automatic user recognition. Wearable devices inherently provide the means for detecting their unauthorized usage, or for being used as front-end in biometric recognition systems controlling the access to either physical or virtual locations and services. The present work evaluates the feasibility of performing biometric recognition using signals captured by wearable devices, considering data collected through off-the-shelf commercial wristbands, and comparing recordings taken during two distinct sessions separated by an average time of 7 days. In more detail, recognition is performed leveraging on electrodermal activity (EDA) and blood volume pulse (BVP), considering measurements taken from 17 subjects performing natural activities such as attending or teaching lectures. Several tests have been carried out to determine the most effective representation of the considered EDA and BVP signals, as well as the most suitable classifier. The best recognition performance has been achieved exploiting convolutional neural networks to extract discriminative characteristics from the combined spectrograms of the employed EDA and BVP data, guaranteeing average correct identification rate of 98.58% for test samples lasting 30 seconds.
Keywords: Wearable | Biometrics | Machine learning
مقاله انگلیسی
84 Assessment of public lighting systems considering mesopic vision
ارزیابی سیستم های روشنایی عمومی با توجه به دید مزوپیک-2021
The objective of this research was to evaluate public lighting systems installed in a concrete pathway considering the effects of mesopic vision. The light sources evaluated were high-pressure sodium vapour, metal halide and LED. The quantitative evaluation was based on in-situ measurements of the illuminance and luminance levels and computer simulations. The qualitative aspect included the application of questionnaires to local users. It was found that the energy savings could be up to 53% when replacing metal-halide lamps with LEDs. As for the qualitative analysis, the LED lamp was the one that received the best evaluation, followed by the metal halide and finally the high-pressure sodium vapour. The LED provided a greater sense of security to people, although the illuminance level provided was 31% less than that of the sodium vapour lamp. The research confirmed the effects of mesopic vision, i.e. when light sources with higher S/P (Scotopic/Photopic) ratio were used, the luminous perception and efficiency of the systems increased. Based on the analysis performed, it was noticed that the use of LEDs to light a concrete pathway was the best option in terms of energy savings and safety.© 2020 Elsevier Ltd. All rights reserved.
Keywords: Public lighting | LED | High-pressure sodium lamps | Metal-halide lamps | Mesopic vision | Computer simulation
مقاله انگلیسی
85 Knowledge management performance measurement based on World-Class Competitive Advantages to develop strategic-oriented projects: Case of Iranian oil industry
اندازه گیری عملکرد مدیریت دانش بر اساس مزایای رقابتی در سطح جهانی برای توسعه پروژه های استراتژیک گرا: مورد صنعت نفت ایران-2021
Knowledge Management (KM) is one of the main sources for achieving World-Class Competitive Advantages (WCCAs), and is also an incentive for the development of strategic-oriented projects. Because subsidiaries of the oil industry are always looking for WCCAs to implement their strategic-oriented projects, it is important to measure WCCAs-based KM performance. We offered a WCCAs-based Knowledge Management Performance Measurement (KMPM) instrument to develop strategic-oriented projects and validated it in the Iranian oil in- dustry. Based on an in-depth review of previous studies, the indicators of KMPM that could lead to WCCAs were extracted. Then, an exploratory factor analysis and a confirmatory factor analysis were used to identify and confirm the criteria of the proposed instrument. Based on the proposed instrument, the KM performance of the subsidiaries of the Iranian Ministry of Petroleum (MoP) was assessed, and finally, strategic-oriented projects were suggested. Our proposed instrument includes four main criteria, namely “knowledge quality”, “knowledge utility”, “knowledge innovation”, and “business results”, all of which are valid in the Iranian oil industry. Our findings also present 17 strategic-oriented projects. The policymakers and the top managers of the surveyed companies could obtain more knowledge regarding measuring the WCCAs-based KM performance, and utilize it to develop their strategic-oriented projects. The present research is one of the first studies of its kind that pro- vides a WCCAs-based KMPM instrument and expands the literature on KMPM and WCCAs.
keywords: مدیریت دانش | عملکرد مدیریت دانش | اندازه گیری | جهت گیری استراتژیک | مزایای رقابتی در سطح جهانی | صنعت نفت ایران | Knowledge management | Knowledge management performance | measurement | Strategic orientation | World-class competitive advantages | Iranian oil industry
مقاله انگلیسی
86 Application of integrated binocular stereo vision measurement and wireless sensor system in athlete displacement test
استفاده از سیستم اندازه گیری دید استریو بصری یکپارچه و سیستم حسگر بی سیم در آزمون جابجایی ورزشکاران-2021
Based on binocular stereo vision measurement and wireless sensing theory, this paper studies the measurement and analysis methods of athletes’ movement displacement parameters. The main purpose is to explore the relationship between sports biomechanical parameters. The analysis reveals the laws of athletes ’movements, and provides theoretical guidance on athletes’ attitude recognition and physical training. Based on the principle of binocular stereo vision, a noncontact displacement measurement system was developed. The displacement measurement system uses template matching to extract the image coordinates of the measurement points and restore the spatial coordinates of the measurement points through European 3D reconstruction, which improves the practicality of the measurement system. In the cantilever beam vibration test, the traditional displacement sensor and binocular image displacement measurement system are used to simultaneously measure the cantilever beam displacement. The experimental results show that the integrated displacement measurement system in this paper has higher accuracy and better stability.
KEYWORDS: Binocular stereo vision | Non-contact measurement | Mobile control | Node displacement | Wireless sensor system
مقاله انگلیسی
87 Adaptive finite element eye model for the compensation of biometric influences on acoustic tonometry
مدل چشم اجزای محدود تطبیقی برای جبران تأثیرات بیومتریک بر تونومتری آکوستیک-2021
Background and objective: Glaucoma is currently a major cause for irreversible blindness worldwide. A risk factor and the only therapeutic control parameter is the intraocular pressure (IOP). The IOP is determined with tonometers, whose measurements are inevitably influenced by the geometry of the eye. Even though the corneal mechanics have been investigated to improve accuracy of Goldmann and air pulse tonometry, influences of geometric properties of the eye on an acoustic self-tonometer approach are still unresolved.
Methods: In order to understand and compensate for measurement deviations resulting from the geometric uniqueness of eyes, a finite element eye model is designed that considers all relevant eye components and is adjustable to all physiological shapes of the human eye.
Results: The general IOP-dependent behavior of the eye model is validated by laboratory measurements on porcine eyes. The difference between simulation and measurement is below 8 μm for IOP levels from 5 to 40 mmHg. The adaptive eye model is then used to quantify systematic uncertainty contributions of a variation of eye length and central corneal thickness based on input statistics of a clinical trial series. The adaptive eye model provides the required relation between biometric eye parameters and the corneal deflection amplitude, which here is the measured quantity to trace back to the IOP. Implementing the relations provided by the eye model in a Gaussian uncertainty propagation calculation now allows the quantification of the uncertainty contributions of the biometric parameters on the overall measurement uncertainty of the acoustic self-tonometer. As a result, a systematic uncertainty contribution resulting from deviations in eye length dominate stochastic deviations of the sensor equipment by a factor of 3.5.
Conclusion: As perspective, the proposed adaptive eye model provides the basis to compensate for systematic deviations of (but not only) the acoustic self-tonometer.
Keywords: Corneal vibration | Transient simulation | FEM | Eye model | Intraocular pressure | Glaucoma
مقاله انگلیسی
88 A Prenatal Ultrasound Scanning Approach: One-Touch Technique in Second and Third Trimesters
رویکرد اسکن سونوگرافی قبل از تولد: تکنیک یک لمس در سه ماهه دوم و سوم-2021
This study was aimed at evaluating the performance of the innovative technique Smart Fetus (SF) developed to recognize the planes and obtain the basic biometric measurements of fetuses automatically. This prospective study included 1005 uncomplicated singleton pregnancies undergoing routine examinations. For every pregnancy, planes, including the transverse section of the thalami, transverse section of the abdomen and longitudinal section of the femur, were acquired, and standard biometric measurements, including biparietal diameter, head circumference, abdominal circumference and femur length, were obtained using SF and traditional ultrasound technique (TUT). The accuracy, reproducibility and time required for the analysis of SF were compared with those of TUT. In 998 of 1005 cases (99.30%), SF successfully acquired the sections and made all measurements. The agreement between the techniques was high for all measurements. The time to obtain sections and measure biometric parameters or solely measure biometric parameters was significantly shorter with SF than with TUT. No significant differences were found in SF repeated measurements obtained by two independent observers. The SF technique helped in the acquisition of reliable standard sections and biometric measurements and saved time. It might serve as a novel ultrasound scanning approach and improve workflow efficiency. (E-mail: lishengli63@126. com) © 2021 World Federation for Ultrasound in Medicine & Biology. All rights reserved.
KeyWords: Artificial intelligence | Biometric measurement | Fetus | Prenatal ultrasonography | Standard plane.
مقاله انگلیسی
89 Phytomyxid infection in the non-native seagrass Halophila stipulacea in St Eustatius, Caribbean Netherlands
عفونت فیتومیکسید در علف دریایی غیر بومی Halophila stipulacea در سنت یوستاتیوس ، کارائیب هلند-2021
Phytomyxids are a monophyletic group of biotrophs/parasites of a variety of organisms including seagrasses with a wide distribution range that includes the Caribbean. The seagrass Halophila stipulacea, native to the Indo-Pacific and Red Sea, is a known host for phytomyxids in the Mediterranean. However, to date phytomyxid infection has not been reported for H. stipulacea in the Caribbean. Infection in H. stipulacea is characterized by swelling of the leaf petioles due to gall formation, and coloration of these galls varies depending on the stage of maturity.H. stipulacea fragments with an apparent phytomyxid infection as well as uninfected fragments were collected in St Eustatius, north-eastern Caribbean, for comparative biometric analysis. Measurements of leaf length, leaf width, internode and root length were taken. Infected H. stipulacea fragments were significantly smaller than uninfected fragments across all biometrics measured, and exhibited similar gall colorations and swelling of the leaf petioles previously described for H. stipulacea in the Mediterranean. Based on our observations, the apparent infection in H. stipulacea fragments on St. Eustatius is likely caused by a phytomyxid parasite and is the first record of phytomyxid infection of this seagrass species in the Caribbean.
Keywords: Non-native seagrass | Plant parasite | Aquatic plant | Infection | Gall | Morphological change
مقاله انگلیسی
90 The normal fetal Cavum Septum Pellucidum in MR imaging – New biometric data
نرمال جنین Cavum Septum Pellucidum در تصویربرداری MR - داده های بیومتریک جدید-2021
Background and purpose: The cavum septum pellucidum (CSP) is an important landmark in the evaluation of the fetal neural axis. A deviation from the ultrasonic normal values may be associated with unfavorable outcomes, and a normal CSP provides reassurance of normal central forebrain development. Today, there is biometric data regarding the normal values for the width of the CSP in fetal ultrasound, but there is no such data for fetal MRI. The aim of this study was to determine the normal values for the measurements of the fetal CSP on MRI.
Materials and methods: We retrospectively examined 307 MRI scans of fetuses between 25 and 41 weeks gestation. Data was collected from the electronic charts of patients who underwent fetal MR imaging at a single tertiary Medical Center. The width and length of the CSP were measured in the axial plane, and the width and height were measured in the coronal plane. Results: The width and height of the CSP in fetuses tend to decrease starting from the 27th week of gestation onwards. High levels of intra observer and interobserver agreements were calculated. The sex of the fetus does not appear to influence the biometry of the CSP.
Conclusion: This study provides MRI reference values for the dimensions of the CSP starting from the 25th week of gestation. Knowing the normal values for MRI could provide valuable information for researchers and in the decision-making process in patient’s consultations.
Keywords: Septum pellucidum | Fetus | Magnetic resonance imaging | Reference values | Growth and development
مقاله انگلیسی
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