scholarly journals Application of the Correction Function to Improve the Quality of PM Measurements with Low-Cost Devices

2018 ◽  
Vol 57 ◽  
pp. 02009
Author(s):  
Mariusz Rogulski ◽  
Artur Badyda
Keyword(s):  
Low Cost ◽  
Correction Function ◽  
Reference Measuring ◽  
Comparative Tests ◽  
Measuring Devices ◽  
Reference Device ◽  
Accuracy Of Measurements ◽  
Measurement Results

Reliable information on the particulate matter (PM) concentration in the air is provided by professional, reference measuring devices. In recent times, however, measuring devices using low-cost PM sensors have been gaining more and more popularity. Low-cost PM sensors are not as accurate as professional devices and can under certain circumstances significantly distort results. Therefore comparative measurements with professional devices and the determination of the corrective function are necessary. The article presents the results of tests on the accuracy of measurements made with the use of such sensors after applying a correction function. The form of the correction function was determined based on several months of comparative tests low-cost sensors with reference device. Then, for a different set of low-cost sensors, a correction function was applied and again, during several months of research, the measurement results were compared with a reference device. This made it possible to determine the real measurement uncertainty of this type of equipment, as well as the need to support measurements using earlier comparative tests. Results showed, that for analysed low-cost PM sensors and correction function measurement error was about 15%.

scholarly journals Evaluation Of QuEChERS Sample Preparation For Determination Of Benzimidazoles Residues In Meat By UPLC-MS/MS

2021 ◽  
Vol 16 (1) ◽  
pp. 32-40
Author(s):  
O.V. Bayer ◽  
O.V. Bondarets ◽  
V.М. Mykhalska ◽  
L.V. Shevchenko ◽  
О.М. Stupak ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Low Cost ◽  
Residue Analysis ◽  
Benzimidazole Derivatives ◽  
Quechers Method ◽  
Modified Quechers ◽  
Tandem Mass Spectrometric ◽  
Liquid Chromatographic

A liquid chromatographic-tandem mass spectrometric (LC–MS/MS) multi-residue method has been used for the simultaneous quantification and identification of 9 residues and metabolites of benzimidazole derivatives that the most widely used as anthelmintic veterinary drugs of animals. The modified QuEChERS method was used for sample preparation, which was initially developed for pesticide residue analysis. This paper highlights how quick, easy, cheap, effective and rugged the QuEChERS extraction method is. The method was successfully validated according to the 2002/657/EC guidelines. Recovery of analytes was in the range 99 – 110 %. The decission limits (ССα ) were calculated at MRL level for analytes with an established permitted limit as next: 104.5 μg kg-1 (albendazole), 53.2 μg kg-1 (fenbendazole), 54.2 μg kg-1 (flubendazole), 12.1 μg kg-1 (levamisole), 53.9 μg kg-1 (cambendazole), 64.2 μg kg-1 (mebendazole), 52.5 μg kg-1 (parabendazole), 105.8 μg kg-1 (thiabendazole), 234.2 μg kg-1 (triclobendazole). The suitability of the assay has been assessed through InterVal Software by quo data GmbH (Germany). The method achieves high quality of the results, good recovery, repeatabilities, within-lab reproducibilities, and wide analytical scope and has practical benefits, low cost, high sample throughput, little labor used and few lab ware.

scholarly journals Preliminary comparative assessment and elements of equivalence of air pollution measurement results of portable monitoring stations with using stochastic models

2018 ◽  
Vol 28 ◽  
pp. 01028 ◽  
Author(s):  
Tomasz Owczarek ◽  
Mariusz Rogulski ◽  
Artur Badyda
Keyword(s):  
Air Pollution ◽  
Stochastic Models ◽  
Reference Method ◽  
Comparative Assessment ◽  
Portable Monitoring ◽  
Measuring Devices ◽  
Building Models ◽  
Reference Device ◽  
Measurement Results ◽  
Pollution Measurement

This article is an attempt to assess the suitability of new non-reference mobile measuring devices for the analysis of PM10 concentrations. The aim is to compare the concentration daily values measured by these devices with the concentrations obtained by the reference device. It also examines the possibility of building models that correct these values to equivalent reference values. The analysis allows to conclude that the properties of the obtained measurements indicate a good chance of constructing an effective model of correcting the concentration values. Comparison of frequency, time variation and correlation of concentrations indicates the ability to demonstrate the equivalence of mobile devices with the reference method.

scholarly journals Application of computed tomography for measuring of roundness

Mechanik ◽  
2017 ◽  
Vol 90 (12) ◽  
pp. 1157-1159 ◽  
Author(s):  
Bartosz Gapiński ◽  
Michał Wieczorowski ◽  
Karol Grochalski ◽  
Katarzyna Peta
Keyword(s):  
Computed Tomography ◽  
Comprehensive Assessment ◽  
Measuring Technique ◽  
Customer Expectations ◽  
Measuring Devices ◽  
Measurement Results ◽  
Form Deviation ◽  
Ct Measurement

Customer expectations in terms of products quality are constantly growing. Therefore, to control only dimensions is not enough; it is necessary to check also the form deviation or roughness. The vast majority of measurement nowadays is carried out by different coordinate measuring devices. Measuring computed tomography is the newest field of coordinate measuring technique, which makes many aspects of its accuracy and possible applications still open. The paper presents the measurement results of elements with different values of roundness deviations. Examined samples were checked on a formtester and computed tomography. For CT measurement, different strategies to verify the influence on received results were used. The ability to measure form deviations on CT allows to verify the quality of hard to reach part areas, but also a comprehensive assessment of geometry, e.g. parts made of plastic and measured on CT.

scholarly journals ODOMETRY AND LOW-COST SENSOR FUSION IN TMM DATASET

2016 ◽  
Vol XL-3/W4 ◽  
pp. 27-34
Author(s):  
A. M. Manzino ◽  
C. Taglioretti
Keyword(s):  
Unscented Kalman Filter ◽  
Low Cost ◽  
Tangential Velocity ◽  
Motion Model ◽  
Urban Centre ◽  
Motion Models ◽  
Filtering Technique ◽  
Vehicle Trajectory

The aim of this study is to identify the most powerful motion model and filtering technique to represent an urban terrestrial mobile mapping (TMM) survey and ultimately to obtain the best representation of the car trajectory. The authors want to test how far a motion model and a more or less refined filtering technique could bring benefits in the determination of the car trajectory. <br><br> To achieve the necessary data for the application of the motion models and the filtering techniques described in the article, the authors realized a TMM survey in the urban centre of Turin by equipping a vehicle with various instruments: a low-cost action-cam also able to record the GPS trace of the vehicle even in the presence of obstructions, an inertial measurement system and an odometer. <br><br> The results of analysis show in the article indicate that the Unscented Kalman Filter (UKF) technique provides good results in the determination of the vehicle trajectory, especially if the motion model considers more states (such as the positions, the tangential velocity, the angular velocity, the heading, the acceleration). The authors also compared the results obtained with a motion model characterized by four, five and six states. <br><br> A natural corollary to this work would be the introduction to the UKF of the photogrammetric information obtained by the same camera placed on board the vehicle. These data would permit to establish how photogrammetric measurements can improve the quality of TMM solutions, especially in the absence of GPS signals (like urban canyons).

scholarly journals Aplikasi Bentonite Lokal Terhadap Nilai Compressive dan Shear Bond Strength Suspensi Semen Sumur Minyak

2020 ◽  
Vol 20 (02) ◽  
pp. 85-92
Author(s):  
Idham Khalid ◽  
Ali Musnal ◽  
Adi Novriansyah ◽  
Kurniawan Sitanggang
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
American Petroleum Institute ◽  
Optimum Concentration ◽  
Additive Concentration ◽  
Significant Difference ◽  
Measurement Results

[ID] Pelaksanaaan proses penyemenan yang baik pada sumur minyak merupakan aspek penting yang berpengaruh pada suskesnya produksi minyak ke permukaan. Untuk itu, penggunaan additif dalam suspense semen direkomendasikan supaya kulitas suspense semen tetap stabil selama proses penyemenan berlangsung. Melakui penelitian ini kualitas bentonite lokal dan bentonite komersial terhadap parameter compressive strength(CS) dan shear bond strength (SBS) akan dibandingkan. Pengukuran CS dan SBS dilkukan berdasarkan rekomendasi dari American Petroleum Institute (API) pada tujuh buah sampel suspense semen dengan konsentrasi aditif yang bervariasi.  Hasil penelitian terhadap bentonite lokal menunjukkan penurunan nilai CS dengan bertambahnya konsentrasi aditif. Konsentrasi optimum bentonite lokal adalah 1.6% dengan nilai CS sebesar 1649 psi, 6%  dibawah nilai CS untuk sampel suspense semen dan bentonite komersial pada konsentrasi yang sama. Untuk nilai SBS, konsentrasi optimum untuk aditif bentonite lokal adalah 4.8% dengan nilai SBS sebesar 439 psi, 21 % diatas nilai SBS untuk sampel semen dengan 4.8% bentonite komersial. Dari penentuan nilai CS dan SBS dapat disimpulkan bahwa penggunaan bentonite lokal dapat menjadi alternatif pengganti bentonite komersial dimana hasil pengukuran CS dan SBS tidak menunjukkan perbedaan yang signifikan. [EN] The implementation of a good cementing process in oil wells is an important aspect that affects the success of oil production to the surface. For this reason, the use of additives in semen suspense is thought that the quality of the cement suspension remains stable during the cementing process. By doing this research, the quality of local bentonite and commercial bentonite against the parameters of compressive strength (CS) and shear bond strength (SBS) will be compared. CS and SBS measurements were carried out based on recommendations from the American Petroleum Institute (API) on seven cement suspension samples with varying additive concentrations. The results of research on local bentonite showed a decrease in the value of CS with an increase in additive concentration. The optimum concentration of local bentonite is 1.6% with a CS value of 1649 psi, 6% below the CS value for cement and commercial bentonite suspense samples at the same concentration. For the SBS value, the optimum concentration for local bentonite additives is 4.8% with an SBS value of 439 psi, 21% above the SBS value for cement samples with 4.8% commercial bentonite. From the determination of CS and SBS values, it can be shown that the use of local bentonite can be an alternative to commercial sites where the CS and SBS measurement results do not show a significant difference.

scholarly journals Determination Of Legal Remedies For Civil Cases To Make The Principles Of Justice Simple, Fast And Lighting Cost

2021 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Andrianantenaina Fanirintsoa Aime ◽  
Zulfikar Dori Ad’ha
Keyword(s):  
Supreme Court ◽  
Justice System ◽  
Low Cost ◽  
State Institutions ◽  
Legal Remedies ◽  
The Supreme Court ◽  
Principles Of Justice ◽  
The Republic

One of the principles in the justice system is justice that is simple, fast and low cost. In this regard, the People's Consultative Assembly (MPR) takes this matter seriously and responds to it by issuing a decree, namely TAP MPR No. VIII/MPR/2000 concerning the Annual Report of High State Institutions at the 2000 Annual Session of the People's Consultative Assembly of the Republic of Indonesia, which one of its substances recommends that the Supreme Court immediately resolve delinquent cases by increasing the number and quality of decisions and that the Supreme Court makes regulations to limit entry cassation case. With this principle, it is necessary to conduct a study regarding the application of these principles.

scholarly journals Disposable and Low-Cost Colorimetric Sensors for Environmental Analysis

2020 ◽  
Vol 17 (22) ◽  
pp. 8331
Author(s):  
Giancarla Alberti ◽  
Camilla Zanoni ◽  
Lisa Rita Magnaghi ◽  
Raffaela Biesuz
Keyword(s):  
Environmental Analysis ◽  
Low Cost ◽  
Single Shot ◽  
Advantages And Disadvantages ◽  
Resource Limited ◽  
Naked Eye Detection ◽  
Colorimetric Sensors

Environmental contamination affects human health and reduces the quality of life. Therefore, the monitoring of water and air quality is important, ensuring that all areas are acquiescent with the current legislation. Colorimetric sensors deliver quick, naked-eye detection, low-cost, and adequate determination of environmental analytes. In particular, disposable sensors are cheap and easy-to-use devices for single-shot measurements. Due to increasing requests for in situ analysis or resource-limited zones, disposable sensors’ development has increased. This review provides a brief insight into low-cost and disposable colorimetric sensors currently used for environmental analysis. The advantages and disadvantages of different colorimetric devices for environmental analysis are discussed.

scholarly journals Low-Cost Sensors for Determining the Variation in Interior Moisture Content in Gypsum Composite Materials

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5831
Author(s):  
Daniel Ferrández ◽  
Carlos Morón ◽  
Pablo Saiz ◽  
Evangelina Atanes-Sánchez ◽  
Engerst Yedra
Keyword(s):  
Building Materials ◽  
Low Cost ◽  
Capacitive Sensor ◽  
Mechanical Resistance ◽  
X Ray Diffraction ◽  
Destructive Testing ◽  
Measuring Devices ◽  
Setting Process ◽  
Non Destructive

Non-destructive testing can be used to determine some of the most relevant physical properties of building materials. In this work, two low-cost measuring devices were developed capable of determining the variation in real-time of the percentage of humidity that is produced in the construction of gypsum and plaster during the hardening process. For this, an Arduino resistive sensor and a capacitive sensor of our design were used. The results show how it is possible to determine the variations in mixing water content during the seven days of curing established by the UNE-EN 13279-2 standard as well relate to the mechanical resistance of the test specimens with the same percentage of humidity. Additionally, the study was completed with the determination of the formation of the dihydrate compound linked to this setting process in the test specimens by conducting X-ray diffraction and thermogravimetric analysis tests at different ages of the samples.

Measurement and Comparison of Force Effort During Friction Stir Welding in a Parallel Kinematic 5-Axis Milling Machine

2012 ◽  
Author(s):  
Arun Prasath Manogaran ◽  
Guillaume Racineux ◽  
Jean-Yves Hascoet
Keyword(s):  
Friction Stir Welding ◽  
Low Cost ◽  
Milling Machine ◽  
Friction Stir ◽  
Advantages And Disadvantages ◽  
Measuring Devices ◽  
Wide Range ◽  
Dynamic Measuring ◽  
And Control

Friction stir welding (FSW) is so quite promising that leads it to one of the preferred joining process for a wide range of applications especially for Aluminum. FSW machines are very expensive. The objective is to develop a simple and low cost technique to measure and control the force during FSW in a milling machine. Measurement of forces during welding is a difficult task. Many dynamic measuring devices such as dynamometers are available but each have their own advantages and disadvantages. A new approach to measure force while performing weld is discussed. First, incorporation of FSW in PKM 5-axes milling machine is done. The head of the machine is modified to support higher force levels that are generated during FSW. With the help of the NC-Controller, the force values are retrieved from the axes of the machine while performing weld through actuators. Forces were also measured from load cell and compared to estimate the quality of measurement.

scholarly journals Using CNN and HHT to Predict Blood Pressure Level Based on Photoplethysmography and Its Derivatives

Biosensors ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 120
Author(s):  
Xiaoxiao Sun ◽  
Liang Zhou ◽  
Shendong Chang ◽  
Zhaohui Liu
Keyword(s):  
Blood Pressure ◽  
Medical Information ◽  
Low Cost ◽  
Blood Pressure Level ◽  
Risk Level ◽  
Hilbert Huang Transform ◽  
Grade Prediction ◽  
Measuring Devices ◽  
Measurement Results ◽  
The Cost

According to the WTO, there were 1.13 billion hypertension patients worldwide in 2015. The WTO encouraged people to check the blood pressure regularly because a large amount of patients do not have any symptoms. However, traditional cuff measurement results are not enough to represent the patient′s blood pressure status over a period of time. Therefore, there is an urgent need for portable, easy to operate, continuous measurement, and low-cost blood pressure measuring devices. In this paper, we adopted the convolutional neural network (CNN), based on the Hilbert–Huang Transform (HHT) method, to predict blood pressure (BP) risk level using photoplethysmography (PPG). Considering that the PPG′s first and second derivative signals are related to atherosclerosis and vascular elasticity, we created a dataset called PPG+; the images of PPG+ carry information on PPG and its derivatives. We built three classification experiments by collecting 582 data records (the length of each record is 10 s) from the Medical Information Mart for Intensive Care (MIMIC) database: NT (normotension) vs. HT (hypertension), NT vs. PHT (prehypertension), and (NT + PHT) vs. HT; the F1 scores of the PPG + experiments using AlexNet were 98.90%, 85.80%, and 93.54%, respectively. We found that, first, the dataset established by the HHT method performed well in the BP grade prediction experiment. Second, because the Hilbert spectra of the PPG are simple and periodic, AlexNet, which has only 8 layers, got better results. More layers instead increased the cost and difficulty of training.

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