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Tytuł:
Effect of high electrostatic actuation on thermoelastic damping in thin rectangular microplate resonators
Autorzy:
Mohammadi, A. K.
Ali, N. A.
Powiązania:
https://bibliotekanauki.pl/articles/280595.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
microplate resonator
thermoelastic damping
high polarization voltage
Opis:
In this paper, a micro resonator is modeled as a thin rectangular microplate with thermoelastic damping that is actuated electrostatically. Large static deformation due to high polarization voltage is considered, and vibration of microplate occurs around the static de- flection. Due to the effect of thermoelastic damping, the frequency of vibration is a complex value that is used to determine the quality factor of thermoelastic damping. Also, the pull-in voltage is considered because nonlinear properties are more appeared when approaching the polarization voltage to the pull-in voltage.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 2; 317-329
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of EEG Signals Using Adaptive Time-Frequency Distributions
Autorzy:
Khan, N. A.
Ali, S.
Powiązania:
https://bibliotekanauki.pl/articles/221878.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Adaptive Directional Time-Frequency Distribution
EEG signals
Time-Frequency features
pattern recognition
Opis:
Time-Frequency (t-f) distributions are frequently employed for analysis of new-born EEG signals because of their non-stationary characteristics. Most of the existing time-frequency distributions fail to concentrate energy for a multicomponent signal having multiple directions of energy distribution in the t-f domain. In order to analyse such signals, we propose an Adaptive Directional Time-Frequency Distribution (ADTFD). The ADTFD outperforms other adaptive kernel and fixed kernel TFDs in terms of its ability to achieve high resolution for EEG seizure signals. It is also shown that the ADTFD can be used to define new time-frequency features that can lead to better classification of EEG signals, e.g. the use of the ADTFD leads to 97.5% total accuracy, which is by 2% more than the results achieved by the other methods.
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 251-260
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Investigation of the Hair of Diabetic Patients
Autorzy:
Ali, A.
Verma, N.V.
Powiązania:
https://bibliotekanauki.pl/articles/412256.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
diabetes
metals
hair
AAS
Opis:
Diabetes is a major disease condition that is accountable for 5% of annual cause of death globally and it continues to escalate. In this research the levels of minerals in persons with type 2 diabetes were investigated using hair as the biopsy specimen. The philosophy behind is that minerals are involved in countless metabolic functions in all phases of the life process, an imbalance of which can have widespread implication, while hair due to its physiology serves an invaluable record of the body's exposure to minerals. Hair metal testing is a fascinating new diagnostic tool and often gives unexpected clues to mineral imbalances in the body. In executing the research samples of head hair collected from 6 type 2 diabetic patients were washed to remove exogenous contaminants, then subjected to open vessel acid digestion and subsequent analysis for the elements Ca, Cd, Cr, Cu Fe, K, Mg, Na and Zn using Flame Atomic Absorption Spectroscopy (FLAAS). After comparing the concentration of the elements to a range that is considered to be normal it was found that Ca, Zn, Fe, Mg, K, Cu, Cd and Cr were off range while Na was normal. Upon investigating the function and effects of the elements that were off range it was found that a deficiency of chromium and an excess of iron could be a possible cause of diabetes.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 3; 37-45
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic diversity of Brassica rapa germplasm of Khyber Pakhtunkhwa Pakistan revealed by molecular markers
Autorzy:
Ali, N.
Ali, S.
Khan, N.U.
Jan, S.A.
Rabbani, M.A.
Hussain, I.
Powiązania:
https://bibliotekanauki.pl/articles/12690092.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Pakistan
plant breeding
Brassica rapa
germplasm
genetic diversity
plant genotype
molecular marker
SSR marker
Opis:
A total of 96 indigenous Brassica rapa accessions were collected from different locations of Khyber Pakhtunkhwa, Pakistan. Simple Sequence Repeats (SSR) markers were used to identify the most diverse genotypes among the collected lots. Twenty six (26) different SSR primers were used for (genetic) variability among collected genotypes. These primers were selected from literature based on their previous results. These primers produced 135 scorable bands of which 75 were polymorphic, with an average of 55.5% polymorphic loci, and reflected the broader genetic background of the collected genotypes. An average 2.88 polymorphic bands with an average PIC value of 0.49 was recorded. Unweighted Pair Group Method with Arithmetic Mean (UPGMA) divided all genotypes into three main groups. Group one contained three clusters, while group two and three had four and two clusters each. Based on the UPGMA dendrogram, genotypes collected from Kohat, Bannu, Swat and Haripur showed considerable amount of variation. From the present study, it is concluded that SSR markers can be proved as the best tool for the genetic variability of other local and exotic B. rapa genotypes.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 6; 57-65
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maintenance and management of wastewater system components using the condition index system, prediction process and costs estimation
Konserwacja i zarządzanie systemem kanalizacji ściekowej za pomocą systemu wskaźnika stanu, procesu przewidywania i szacowania kosztów
Autorzy:
Amani, N.
Ali, N. M.
Mohammed, A. H.
Samat, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/302164.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
proces zarządzania konserwacją
instalacja
optymalizacja
analiza kosztów
studium przypadku
maintenance management process
component
optimization
cost analysis
case study
Opis:
Component maintenance management of public building is complex and dynamic as the execution of the engineering management system is subjected to sensitive staff and users' requirements and high expectation of the top management for supporting the business. This paper presents the practices and survey need for maintaining the facilities systems in the building. The purpose of this study is maintenance time optimization of building component using the USACERL condition index (CI) system. To achieve this objective, cast iron pipe within wastewater plumbing system is surveyed using the financial analysis for implementation of optimal maintenance time based on limited cost. The findings show how a best time approach to plumbing system maintenance can assist the owner for decision making in component maintenance time based on existing cost.
Zarządzanie konserwacją instalacji budynku publicznego jest złożone i dynamiczne z uwagi na fakt, iż realizacja systemu zarządzania technicznego poddana jest zarówno wymaganiom personelu i użytkowników końcowych jak i oczekiwaniom kierownictwa w zakresie wsparcia rozwoju przedsiębiorstwa. W niniejszym artykule przedstawiono praktykę oraz badania dotyczące potrzeb wiążących się z konserwacją instalacji w budynkach. Celem tego opracowania jest optymalizacja czasu konserwacji tej części budynku za pomocą systemu wskaźnika stanu (condition index - CI) USACERL. Aby osiągnąć ten cel, przeanalizowano za pomocą analizy finansowej system kanalizacji ściekowej oparty na rurach żeliwnych pod kątem przyjęcia optymalnego czasu obsługi w oparciu o ograniczone koszty. Wyniki pokazują jak optymalne podejście czasowe do konserwacji systemu hydraulicznego może pomóc właścicielowi w procesie podejmowania decyzji w aspekcie czasu konserwacji na podstawie rzeczywistych kosztów.
Źródło:
Eksploatacja i Niezawodność; 2013, 15, 2; 161-168
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protoplast isolation and plant regeneration in two cultivated coriander varieties, Co-1 and RS
Autorzy:
Ali, M.
Mujib, A.
Zafar, N.
Tonk, D.
Powiązania:
https://bibliotekanauki.pl/articles/80271.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
plant regeneration
Coriandrum sativum
coriander
cultural variety
plant growth regulator
2,4-dichlorophenoxyacetic acid
6-benzyladenine
alpha-naphthalene acetic acid
gibberellic acid
callus induction
somatic embryogenesis
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 4
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical thermo-mechanical strength analysis of an IC engine component
Autorzy:
Ali, M. A. N.
Hussein, R. A.
Hussein, H. A.
Powiązania:
https://bibliotekanauki.pl/articles/2106442.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza numeryczna
silnik spalinowy
naprężenie
trwałość zmęczeniowa
numerical analysis
IC engine piston
geometrical shape
thermo-mechanical strength
stress intensity
fatigue life
Opis:
This research investigates a thermo-mechanical strength of three geometrical shape designs of an internal combustion (IC) engine piston by a finite element analysis (FEA). FEA was performed using Solidworks software for modelling geometrical piston designs, and the models were imported into ANSYS software for thermo-mechanical fatigue simulation. The work focused on predicting high stress intensity and indicated the fatigue critical regions and life of the piston shape design. AL7075-T6 aluminium alloy was used as a piston material and thermo-mechanical fatigue simulation was conducted based on the experimental stress-number of cycles recorded data from literature. Analytical results showed the similarity of the critical failure positions to some real failures in the IC engine piston, and the shape design modification of the piston. Hence, this concept can be used to satisfy the IC engine design needs at low cost.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 1--11
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integration of navigation, vision, and arm manipulation towards elevator operation for laboratory transportation system using mobile robots
Autorzy:
Abdulla, A. A.
Ali, M. M.
Stoll, N.
Thurow, K.
Powiązania:
https://bibliotekanauki.pl/articles/384579.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
mobile robot
multi-floor
elevator handler
floor estimation
labware transportation system
kinematic analysis
robotic arm control
object detection
localization
Intel Real sense F200 sensor
Opis:
In the automated environments, mobile robots play an important role to perform different tasks such as objects transportation and material handling. In this paper, a new method for a glassy elevator handling system based on H20 mobile robots is presented to connect distributed life science laboratories in multiple floors. Various labware and tube racks have to be transported to different workstations. Locating of elevator door, entry button detection, internal buttons recognition, robot arm manipulation, current floor estimation, and elevator door status checking are the main operations to realize a successful elevator handling system. The H20 mobile robot has dual arms where each arm consists of 6 revolute joints and a gripper. The gripper has two degrees of freedom. Different sensors have been employed with the robot to handle these operations such as Intel RealSense F200 vision sensor for entry and internal buttons detection with position estimation. A pressure sensor is used for current floor estimation inside the elevator. Also, an ultrasonic proximity distance sensor is utilized for checking the elevator door status. Different strategies including HSL color representation, adaptive binary threshold, optical character recognition, and FIR smoothing filter have been employed for the elevator operations. For pressing operation, a hand camera base and a new elevator finger model are designed. The elevator finger is resolved in a way to fit the arm gripper which is used also to manipulate the labware containers. The Kinematic solution is utilized for controlling the arms’ joints. A server/client socket architecture with TCP/IP command protocol is used for data exchange between Multi-Floor System and the H20 robot arms. Many experiments were conducted in life science laboratories to validate the developed systems. Experimental results prove an efficient performance with high success rate under different lightening condition.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 4; 34-50
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of chilling exposure and vapor heat treatment duration on the quality of sweet orange during simulated marketing
Autorzy:
Hussain, I.
Rab, A.
Khan, N.U.
Sajid, M.
Ali, N.
Khan, S.M.
Ali, S.
Powiązania:
https://bibliotekanauki.pl/articles/11543553.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Sweet orange fruits were exposed to vapor heat treatment (50°C) in water bath for 0, 5, 10, 15 and 20 min in plastic covered structure. The data were recorded on different physico chemical factors immediately after the storage and after seven days simulated marketing under ambient condition (20°C). Low temperature storage enhanced weight loss, surface pitting, disease incidence, total soluble solids accumulation, TSS/Acid ratio but decreased reducing sugars, acidity and ascorbic acid content. Chilling exposure up to 45 days had no significant effect on weight loss and TSS. However, increased weight loss (2.63%), TSS (11.75), TSS/Acid ratio (8.45 ºBrix), disease incidence (8.93%) and lowest reducing sugars (3.90) were noted in sweet orange exposed to chilling temperature for 75 days. Among the VHT durations, the highest weight loss (2.29%) was found in VHT for 0 min while the highest TSS (11.81 ºBrix), TSS/Acid ratio (8.10) and disease incidence (6.22%) and least reducing sugars (4.12%) were found in VHT 20 for min. Vapor heat treatment ranging from 5–10 min resulted in lowest weight loss (1.79%), TSS (10.81 ºBrix) TSS/Acid ratio (7.33), disease incidence (1.00%) and highest reducing sugars (4.75%) in sweet orange fruits. However, non-reducing sugars were least affected by both LTSs and VHTs. It is concluded that the chilling exposure (5°C) beyond 45 days aggravated the decline of fruit physio-chemical quality characteristics. Whereas, VHT with 5–10 min maintained the sweet orange fruit quality during simulated marketing; however, VHT of 15–20 min adversely affected the sweet orange fruit quality attributes.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 5; 39-47
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobile robot transportation for multiple labware with hybrid pose correction in life science laboratories
Autorzy:
Ali, M. M.
Abdulla, A. A.
Stoll, N.
Thurow, K.
Powiązania:
https://bibliotekanauki.pl/articles/384665.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
robot position correction
multiple labware transportation
mobile robot localization
motor encoder
localization error handler
Kinect V2
grasping operation
placing operation
multi-floor
Opis:
In automated working environments, mobile robots can be used for different purposes such as material handling, domestic services, and objects transportation. This work presents a transportation process for multiple labware with hybrid pose correction in life science laboratories using H20 mobile robots. Multiple labware and tube racks, which contain chemical and biological components, have to be transported safely between laboratories on different floors of life science environment. Therefore, an accurate approach for labware transportation is required. The H20 robot has dual arms each consisting of 6 revolute joints with 6-DOF. The problem statement of robot positioning error in front of the workstation is presented. The navigation strategy with its related systems is presented for multi-floor mobile robot transportation environment. A Stargazer module is used as a stable and low-cost mapping and localization sensor with artificial landmarks. An error management system to overcome incorrect stargazer reading problems is presented. Different strategies of pose correction for mobile robots are described. The H20 robot is equipped with sonar sensors and Kinect V2 to be used for labware manipulation and position correction. The Kinect sensor V2 with SURF algorithm (Speeded-Up Robust Features) is used to recognize and localize the target. The communication procedure between the transportation platforms is done using client-server models.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 4; 51-64
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Particle swarm optimization algorithm based low cost magnetometer calibration
Autorzy:
Ali, A.
Siddharth, S.
Syed, Z.
El-Sheimy, N.
Powiązania:
https://bibliotekanauki.pl/articles/129567.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
artificial intelligence
systems
measurement
navigation
algorithm
sensor
sztuczna inteligencja
systemy
pomiar
nawigacja
algorytm
Opis:
Inertial Navigation Systems (INS) consist of accelerometers, gyroscopes and a microprocessor provide inertial digital data from which position and orientation is obtained by integrating the specific forces and rotation rates. In addition to the accelerometers and gyroscopes, magnetometers can be used to derive the absolute user heading based on Earth’s magnetic field. Unfortunately, the measurements of the magnetic field obtained with low cost sensors are corrupted by several errors including manufacturing defects and external electro-magnetic fields. Consequently, proper calibration of the magnetometer is required to achieve high accuracy heading measurements. In this paper, a Particle Swarm Optimization (PSO) based calibration algorithm is presented to estimate the values of the bias and scale factor of low cost magnetometer. The main advantage of this technique is the use of the artificial intelligence which does not need any error modeling or awareness of the nonlinearity. The estimated bias and scale factor errors from the proposed algorithm improve the heading accuracy and the results are also statistically significant. Also, it can help in the development of the Pedestrian Navigation Devices (PNDs) when combined with the INS and GPS/Wi-Fi especially in the indoor environments.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2011, 22; 9-23
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of working capital management on SMEs profitability in Malaysia
Wpływ zarządzania kapitałem pracy na rentowność MŚP w Malezji
Autorzy:
Gorondutse, A. H.
Ali, R. A.
Abubakar, A.
Naalah, M. N. I.
Powiązania:
https://bibliotekanauki.pl/articles/405447.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska
Tematy:
working capital
working capital management
SMEs
profitability
Malaysia
kapitał obrotowy
zarządzanie kapitałem obrotowym
MŚP
rentowność
Malezja
Opis:
The paper examines the effects of working capital management on Malaysian SMEs profitability within the sight of control factors measured by the size of the firm, leverage, and sales growth. Secondary data was drowned from Companies Commission of Malaysia, database for 66 SMEs in Malaysia for the period between 2006-2012. Panel data regressions were applied in the analysis. Empirical results established a negative effect of working capital administration measures: Stock Turnover in Days, Days Account Receivables, and Cash Conversion Cycle on SMEs benefit intermediaries, Return on Equity (ROE) and Return on Assets. The results also established a positive effect of Net Operating Profit on Cash Conversion Cycle. Furthermore, the study also revealed a positive effect of Days Account Payables on SME’s Return of Asset and Return of Equity, yet having a negative effect on Net operating Profit. The findings imply that profitability of Malaysian SMEs relies upon effective working capital management. The results imply that Profitability of Malaysian SMEs depends upon effective working capital management. The paper contributes empirical evidence on the effect of working capital on Malaysian SMEs.
Artykuł analizuje wpływ zarządzania kapitałem obrotowym na rentowność w MŚP Malezji pod kątem czynników kontrolnych mierzonych wielkością firmy, dźwignią finansową i wzrostem sprzedaży. Wtórne dane zostały uzyskane z Komisji Firm Malezji, bazy danych dla 66 MŚP w Malezji w latach 2006-2012. W analizie zastosowano regresję danych panelowych. Wyniki empiryczne wykazały negatywny wpływ narzędzi zarządzania kapitałem obrotowym: rotacja zapasów w dniach, należności z tytułu dni płatniczych i cykl konwersji gotówki do pośrednikach świadczeń MŚP, zwrot z kapitału własnego i zwrot z aktywów. Wyniki wykazały również pozytywny wpływ operacji netto. Ponadto, badanie wykazało również pozytywny wpływ zobowiązań z tytułu płatności w dniach na zwroty aktywów i zwrotu kapitałów własnych MŚP, co jednak ma negatywny wpływ na zysk netto z działalności operacyjnej. Wyniki badania sugerują, że rentowność malezyjskich MŚP zależy od Zarządzania kapitałem obrotowym. Wyniki sugerują, że rentowność malezyjskich MŚP zależy od skutecznego zarządzania kapitałem obrotowym. Artykuł ten stanowi dowód empiryczny na temat wpływu kapitału obrotowego na malezyjskie MŚP.
Źródło:
Polish Journal of Management Studies; 2017, 16, 2; 99-109
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Buckling and bending properties of aluminium plate with multiple cracks
Autorzy:
Mohmmed, J. H.
Mahmood, N. Y.
Ali, M.
Zainulabdeen, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/1818485.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
buckling stability
bending strength
crack
aluminium plate
ANSYS package
stabilność wyboczeniowa
wytrzymałość na zginanie
pęknięcie
płyta aluminiowa
pakiet ANSYS
Opis:
Purpose: In this paper, the bending strength and buckling stability of (AA 7075-T6) aluminium plate weakened by many transverse cracks, which located at different positions, subjected to concentrated loads applied at the ends were analysed. Design/methodology/approach: Numerical modelling and calculation by the finite element method (ANSYS Package), for the critical load of bending and compression panel were estimated. Findings: It found that the variation of the critical stress in bending and buckling is proportional to the crack conditions (no. of crack and location). In general, the critical load in bending and buckling decreases with increasing the crack number in structure. Research limitations/implications: For both bending and buckling, two transverse cracks on one face of plate is more stable than two transverse cracks on opposite faces. Practical implications: In addition, many experimental tests were carried out by using an INSTRON test machine to obtain the buckling critical loads, where the experimental results were compared with the ones of the finite element method. Furthermore, bending strength was calculated theoretically for the cracked panel. Originality/value: Comparison between the experimental and numerical (FE based model) data and between the theoretical and nu-merical (FE based model) data for buckling and bending strength respectively indicate the precise and the simplicity of the developed models to determine the critical loads in such cases.
Źródło:
Archives of Materials Science and Engineering; 2020, 106, 2; 49--58
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of operating parameters on production of bio-oil from fast pyrolysis of maize stalk in bubbling fluidized bed reactor
Autorzy:
Ali, N.
Saleem, M.
Shahzad, K.
Hussain, S.
Chughtai, A.
Powiązania:
https://bibliotekanauki.pl/articles/779892.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
fast pyrolysis
bio-oil
temperature
particle size
carrier gas flow rate
maize stalk
Opis:
The yield and composition of pyrolysis products depend on the characteristics of feed stock and process operating parameters. Effect of particle size, reaction temperature and carrier gas flow rate on the yield of bio-oil from fast pyrolysis of Pakistani maize stalk was investigated. Pyrolysis experiments were performed at temperature range of 360-540°C, feed particle size of 1-2 mm and carrier gas flow rate of 7.0-13.0 m3/h (0.61.1 m/s superficial velocity). Bio-oil yield increased with the increase of temperature followed by a decreasing trend. The maximum yield of bio-oil obtained was 42 wt% at a temperature of 490°C with the particle size of around 1.0 mm and carrier gas flow rate of 11.0 m3/h (0.9 m/s superficial velocity). High temperatures resulted in the higher ratios of char and non-condensable gas.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 3; 88-96
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Approach to Design Broadband Air Backed Piezoelectric Sensor
Autorzy:
Ali, M. G. S.
Elsayed, N. Z.
Eid, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/176360.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
piezoelectric
equivalent circuits
impulse response
frequency response
matching layers
z-transform
Opis:
In this work, an approach to the design of broadband thickness-mode piezoelectric transducer is presented. In this approach, simulation of discrete time model of the impulse response of matched and backed piezoelectric transducer is used to design high sensitivity, broad bandwidth, and short-duration impulse response transducers. The effect of matching the performance of transmitting and receiving air backed PZT-5A transducer working into water load is studied. The optimum acoustical characteristics of the quarter wavelength matching layers are determined by a compromise between sensitivity and pulse duration. The thickness of bonding layers is smaller than that of the quarter wavelength matching layers so that they do not change the resonance peak significantly. Our calculations show that the −3 dB air backed transducer bandwidth can be improved considerably by using quarter wavelength matching layers. The computer model developed in this work to predict the behavior of multilayer structures driven by a transient waveform agrees well with measured results. Furthermore, the advantage of this this model over other approaches is that the time signal for optimum set of matching layers can be predicted rapidly.
Źródło:
Archives of Acoustics; 2015, 40, 1; 3-10
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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