scholarly journals Determination of Concentration Profile for Flowing Solid Particles in Pipeline Using Electric Charge Tomography System

2014 ◽  
Vol 2014 ◽  
pp. 1-18
Author(s):  
Iliya Tizhe Thuku ◽  
Mohd Fua’ad Rahmat ◽  
Norhaliza Abdul Wahab ◽  
Teimor Tajdari
Keyword(s):  
Cross Section ◽  
Electric Charge ◽  
Solid Particles ◽  
Financial Accounting ◽  
Cross Sectional ◽  
Distribution Method ◽  
System Equation ◽  
Tomography System ◽  
Cartesian Coordinate

Tomography aims to present an image of a cross-sectional distribution of materials in some regions of interest such as cross-section of a pipeline or process vessel. This paper presents the concentration profiles of solid particles across a conveying pipeline obtained using tomographic imaging. In the paper, 16 electrodynamic sensors were installed around the circumference of a pipeline to capture electric charges carried by the particles moving through the pipeline under gravity. The Cartesian coordinate system used to derive the system equation gave an accurate charge distribution while the meshing technique of the finite element method applied miniaturized the pixel sizes within the sensing zone. The problem of unstable matrix and weak signal response around the center of the pipe cross-section, normally associated with the electric charge tomography system, was addressed using matrix compression through transposition and filtering. The pro rata distribution method mostly applied in the financial accounting analysis was used in the final stage. An algorithm for realization of the concepts was developed using MATLAB. The qualities of the resulting images for four different flow regimes provide good quality images representing the distribution of the particles across the pipeline cross-section.

Development of a New Method of Sensitivity Matrix for Image Reconstruction in Electric Charge Tomography System Using Finite Element Method

2014 ◽  
Vol 70 (3) ◽  
Author(s):  
Iliya Tizhe Thuku ◽  
Mohd Fua’ad Rahmat
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Charge ◽  
Solid Particles ◽  
New Method ◽  
Sensitivity Matrix ◽  
System Equation ◽  
Tomography System ◽  
Computational Mesh ◽  
Element Method

In this paper, a new method of sensitivity matrix generation is presented for application in electric charge tomography system. The sensitivity matrix is the most important parameter in solid particles concentration profile computation in electric charge tomography system. The analytical method of developing the sensitivity matrix that have been developed and used in electric charge tomography is characterised by some uncertainties that give poor tomography images of flowing solid particles. The new proposed method involved subdivision of the pipeline cross-section into many subdivisions called the computational mesh. The subdivision is made by the application of the Finite Element Method (FEM). On each of the electrodynamic sensor installed to detect the electric charges carried by the moving solid particles; the effect of the particles’ electric charges enclosed in each of the computational mesh is modelled into a system equation. The system equation is used to compute the effect of the charges in the form of a matrix system of size [M×N] called the sensitivity matrix. The sensitivity matrix is applied for the reconstruction of the tomography image, using the Linear Back Projection (LBP) method. The reconstructed images represented the solid particles distribution through the pipeline. This assertion is due the consistencies between the simulation and real images with respect to the simulated images and the captured real data.

Profil Penyakit Malaria Di Rumah Sakit Islam Siti Rahmah Padang Tahun 2018

2020 ◽  
Vol 2 (2) ◽  
pp. 08-15
Author(s):  
Rahma Triyana ◽  
Salmi Salmi
Keyword(s):  
Observational Study ◽  
Frequency Distribution ◽  
Cross Section ◽  
Laboratory Tests ◽  
Age Group ◽  
Normal Range ◽  
Cross Sectional ◽  
West Sumatra ◽  
Severity Of The Disease

Malaria is one of the health problems in Indonesia, especially West Sumatra. Determination of the description of Malaria disease in an area is needed to determine the spread and severity of the disease. This study aims to determine the frequency distribution according to age, sex and place of residence, description of the types of Plasmodium causes of Malaria and hematological features in Malaria patients at Siti Rahmah Padang Hospital in 2018. This type of research is a descriptive observational study with an approach or design cross section (cross sectional). The frequency distribution of Malaria sufferers in Siti Rahmah Padang Hospital in 2018 according to the highest age was in the age group 21-30 years as many as 28 cases (36.8%), the highest sex among men was 46 (60.5%) and the highest number of residences was found in Koto Tangah sub-district there were 31 cases (40.8%). The type of Plasmodium found in Malaria cases in Siti Rahmah Padang Hospital in 2018 was P. vivax (73 cases (96.05%)) and P. falciparum (3 cases (3.95%)). The results of laboratory tests on Hb, hematocrit, platelet and leukocyte levels in Malaria positive patients in Siti Rahmah Padang Hospital in 2018 were in the normal range.

Profil Penyakit Malaria di Rumah Sakit Islam Siti Rahmah Padang Tahun 2018

2020 ◽  
Vol 2 (2) ◽  
pp. 08-15
Author(s):  
Rahma Triyana Y ◽  
Salmi Salmi
Keyword(s):  
Observational Study ◽  
Frequency Distribution ◽  
Cross Section ◽  
Laboratory Tests ◽  
Age Group ◽  
Normal Range ◽  
Cross Sectional ◽  
West Sumatra ◽  
Severity Of The Disease

Malaria is one of the health problems in Indonesia, especially West Sumatra. Determination of the description of Malaria disease in an area is needed to determine the spread and severity of the disease. This study aims to determine the frequency distribution according to age, sex and place of residence, description of the types of Plasmodium causes of Malaria and hematological features in Malaria patients at Siti Rahmah Padang Hospital in 2018. This type of research is a descriptive observational study with an approach or design cross section (cross sectional). The frequency distribution of Malaria sufferers in Siti Rahmah Padang Hospital in 2018 according to the highest age was in the age group 21-30 years as many as 28 cases (36.8%), the highest sex among men was 46 (60.5%) and the highest number of residences was found in Koto Tangah sub-district there were 31 cases (40.8%). The type of Plasmodium found in Malaria cases in Siti Rahmah Padang Hospital in 2018 was P. vivax (73 cases (96.05%)) and P. falciparum (3 cases (3.95%)). The results of laboratory tests on Hb, hematocrit, platelet and leukocyte levels in Malaria positive patients in Siti Rahmah Padang Hospital in 2018 were in the normal range.

Concentration Profiling Of Two Phase Flow In A Gravity Flow Rig Using Optical Tomography

2012 ◽  
Author(s):  
Sallehuddin Ibrahim ◽  
Mohd Fua’ad Rahmat ◽  
Mustafa Musbah Elmajri ◽  
Mohammad Amri Mohammad Yunus
Keyword(s):  
Cross Section ◽  
Two Phase Flow ◽  
Optical Tomography ◽  
Solid Particles ◽  
Gravity Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Tomography System ◽  
Infra Red ◽  
Tomography Method

Matlamat kertas kerja ini ialah untuk membentangkan penyelidikan tentang penggunaan kaedah tomografi optik menggunakan penderia–penderia infra merah untuk pemantauan masa nyata terhadap zarah–zarah pepejal yang dialirkan oleh rig aliran graviti. Penderia terdiri daripada dua projeksi cahaya orthogonal dan dua projeksi cahaya melintang untuk membentuk deretan atas dan bawah menjadi empat projeksi selari. Penumpuan pancaran daripada satu sumber cahaya dan mengalirkannya melalui rejim aliran yang memastikan keamatan pancaran dikesan pada bahagian yang bertentangan disambungkan kepada agihan dan pekali serapan bagi fasa–fasa yang berbeza dalam laluan pancaran. Maklumat pada aliran yang diperolehi oleh penderia-penderia yang dipasang di bahagian atas dan bawah akan dijadikan dalam bentuk digital oleh sistem perolehan data sebelum ia dihantar ke sebuah computer untuk dianalisis untuk memaparkan keratan silang imej. Penyelidikan ini berjaya dikembangkan dan diuji menggunakan sebuah sistem tomografi infra merah untuk memaparkan kepekatan aliran dwi fasa dalam rig aliran gravity. Kata kunci: Profil kepekatan; aliran dwi fasa; tomografi optic; infra-merah; aliran pepejal The objective of this paper is to present research on the use of an optical tomography method using infra–red sensors for real–time monitoring of solid particles conveyed by a gravity flow rig. The sensor comprised two orthogonal and two diagonal light projections to form upstream and downstream arrays in a total of four parallel projections. Collimating the radiated beam from a light source and passing it through a flow regime ensures that the intensity of radiation detected on the opposite side is linked to the distribution and the absorption coefficients of the different phases in the path of the beam. The information on the flow captured using upstream and downstream infra-red sensors is digitized by the DAS system before it was passed into a computer to be analyzed in order to reconstruct the cross section image. This investigation successfully developed and tested an infra–red tomography system to profile the concentration of two phase flow in a gravity flow rig. Key words: Concentration profiles; two phase flow; optical tomography; infra–red; solid flow

scholarly journals A simple angle integration method for the determination of capture reaction cross sections

2019 ◽  
Vol 24 ◽  
pp. 129
Author(s):  
V. Michalopoulou-Petropoulou ◽  
V. Lagaki ◽  
M. Axiotis ◽  
V. Foteinou ◽  
A. Lagoyannis ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Integration Method ◽  
Reaction Cross ◽  
Angular Distributions ◽  
Distribution Method ◽  
Hpge Detectors ◽  
Secondary Transitions ◽  
Reaction Cross Sections

In order to determine the cross section of a reaction by the angular distribution method, it is essential to calculate the angular distributions of all secondary transitions that lead to the ground state. This is achieved by analysing spectra from HPGe detectors at various detection angles, which is a time consuming process. In this work, a simpler angle integration method is presented that allows to determine cross sections of capture reactions by measuring spectra at fewer detection angles.

scholarly journals TO A QUESTION OF DETERMINATION OF HYDRAULIC RADIUS OF A BACKFILL FLOW FOR THE EXCENTRATIVE PLACEMENT OF PIPES IN DRILLING BORE

2018 ◽  
pp. 197-209
Author(s):  
V. M. Moishyshyn ◽  
Y. S. Biletskii ◽  
V. V. Vryukalo ◽  
M. V. Seniushkovych
Keyword(s):  
Cross Section ◽  
Dimensionless Parameter ◽  
Internal Surface ◽  
Outer Radius ◽  
Hydraulic Radius ◽  
Cross Sectional ◽  
Internal Radius ◽  
First Time ◽  
Good Agreement

The processes of displacement of drilling clay backfill flow from the intertubular space formed by internal surface of external and external surfaces of inner tubes are considered. In case of eccentric placement of pipes it is proposed in the form of a cross-section of the flow of a backfill to take the area limited from the outside by the Pascal's snail, and from the inside - the outer surface of the inner pipe at the first time. The formulas for determining areas of the cross section of the flow and the stagnant zone, the perimeter and the hydraulic radius of the section ofthe flow for the eccentric placement of the pipes in the bore are proposed. The dimensionless parameter α is introduced as the ratio of the centripetal distance to difference between internal radius of outer pipe and outer radius of inner tube. It was found that with increasing of α cross-sectional area and their hydraulic radii are increasing, and the area of stagnant zones decreases according to parabolic laws.It is established that with the growth of α velocity of the backfill flow decreases according to parabolic laws and their values are in good agreement with the experimental data.

A Simple Method for the Cross-Section Area Determination of Single Profiled Fibers and Its Application

2018 ◽  
Vol 24 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Zhangchuan Peng ◽  
Chun Liu ◽  
Lin Zhang ◽  
Wei Li ◽  
Wenbo Hu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Large Scale ◽  
Frozen Section ◽  
Ratio Method ◽  
Cross Sectional ◽  
Simple Method ◽  
The Cross ◽  
Profiled Fibers

AbstractOne of the critical prerequisites for accurately measuring the mechanical properties of profiled fibers is the precise determination of their cross-sectional areas (CSAs). In this study, a new method is established for determining a single profiled fibers’ CSA based on the frozen section method and digital photo, pixel-ratio method (FS-DP). FS-DP is used to obtain a transverse section of a fiber, by acquiring an image of the cross section using optical microscopy or scanning electron microscopy, and then calculating the CSA using Photoshop. Using FS-DP, it was found that the shape of a fiber of silk changes little in a range of 50 μm, but varies considerably over a range of 1 m, while the CSA of cocoon silk (900 m) first increases and then decreases. Mechanical property tests showed that the elongation, strength, elastic modulus, and toughness values of the cocoon silk are consistent with those reported previously. Additionally, FS-DP was also used to observe other profiled fibers. The application tests indicated that FS-DP can be used to quickly and accurately obtain the CSA of a single profiled fiber, and that it is suitable for the large-scale determination and analysis of the mechanical properties of profiled fibers.

2D Measurement and Simulation of Microparticle Cross-Sectional Distribution by Micro Process Tomography

2010 ◽  
Author(s):  
Je-Eun Choi ◽  
Tong Zhao ◽  
Masahiro Takei
Keyword(s):  
Fluid Flow ◽  
Cross Section ◽  
Particle Distribution ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Particle Movement ◽  
Two Phase ◽  
Cross Sectional ◽  
Tomography System ◽  
Process Tomography

The application of micro process tomography to microchannels is considered in this paper. Using the micro process tomography system in microchannel, a particle distribution image can be obtained in a two phase flow. Based on the reconstructed image, it is easy to estimate the particle movement in a fluid flow. A novel microchannel system is designed for electrical process tomography that includes 60 electrodes distributed cross-sectional at five positions. The particle and water were injected into the microchannel, and then the capacitance of the fluid flow was measured at cross-section of microchannel. The result showed the 2D image of particle distribution of cross-section in the microchannel. Also, cross-sectional images of the particle distribution of a two phase flow are simulated.

scholarly journals Determination of Young’s modulus of Sb2S3 nanowires by in situ resonance and bending methods

2016 ◽  
Vol 7 ◽  
pp. 278-283 ◽  
Author(s):  
Liga Jasulaneca ◽  
Raimonds Meija ◽  
Alexander I Livshits ◽  
Juris Prikulis ◽  
Subhajit Biswas ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Cross Section ◽  
Young's Modulus ◽  
Cross Sectional ◽  
Bending Tests ◽  
Young’S Moduli ◽  
Increasing Trend

In this study we address the mechanical properties of Sb2S3 nanowires and determine their Young’s modulus using in situ electric-field-induced mechanical resonance and static bending tests on individual Sb2S3 nanowires with cross-sectional areas ranging from 1.1·104 nm2 to 7.8·104 nm2. Mutually orthogonal resonances are observed and their origin explained by asymmetric cross section of nanowires. The results obtained from the two methods are consistent and show that nanowires exhibit Young’s moduli comparable to the value for macroscopic material. An increasing trend of measured values of Young’s modulus is observed for smaller thickness samples.

A Study of Cross-Sectional Imaging of a Specimen with Gamma Transmission Tomography System

2014 ◽  
Vol 704 ◽  
pp. 408-411
Author(s):  
J. Kedit
Keyword(s):  
Cross Section ◽  
Transmission Tomography ◽  
Cross Sectional ◽  
Air Gaps ◽  
Tomography System ◽  
Cross Sectional Imaging ◽  
Sectional Imaging ◽  
The Cross ◽  
Cylindrical Steel ◽  
Steel Balls

This paper is a study of cross-sectional imaging of a specimen with gamma transmission tomography system. The aim of this paper is to create the cross-section image of a warhead specimen with the gamma transmission tomography system for inspection the air gaps, cracks find them from the specimen. The compositions of specimen are including cylindrical steel , steel balls ,rubber and plaster. The steel balls are formed in the cylindrical steel and explosive is replaced by plaster. Two holes and a rectangle shape are formed in the plaster. The results from cross-section image from the reconstruction shows holes but the thin rectangle shape is invisible.

Sign in / Sign up

Export Citation Format

Share Document