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Wyświetlanie 1-15 z 63
Tytuł:
Phenotypic characterization of indigenous chicken population in Gwer-West, Benue State, Nigeria
Autorzy:
Rotimi, E. A.
Egahi, J. O.
Adeoye, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/1182895.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
characterization
chicken
native
variations
morphometery
Opis:
This study was carried out to characterize native chickens of Gwer-West Local Government Area of Benue State, Nigeria, based on some phenotypic traits. A total of seven thousand and ninety-one (7091), 4624 females and 243 males, mature native chickens were randomly sampled from the study area. The study covered eleven (11) council wards (North Bank I, Wadata, Modern Market, Wala-mayo, Central South Mission, Bar, Fiidi, Agan, Clerk Mission, Mbalagh and North Bank II). The study was conducted between June and August 2012. Parameters examined include live body weight, body length, feather types, head shape, plumage colour, shank colour, beak colour, comb type ear-lobe colour and wattle colour. Majority of the chickens sampled are female (65.21%). The most predominant feather type, head shape, plumage colour, shank colour, beak colour, comb type, ear-lobe colour and wattle colour were normal (88.49%), plain (92.42%), complete brown (29.01%), white (41.19%), single (88.49%), white (79.37%) and white (68.02%) respectively. Mean live body weight of males (1.38 kg ±0.20) was significantly (p<0.05) heavier than the mean live body weight of females (1.23 kg ±0.19). Males were also superior to females in terms of body length (53.77 cm ±6.01 and 49.05 cm ±5.40 respectively). The study revealed that most of the parameters measured revealed distinctive variations, providing the basis for further characterization of native birds breeds, therefore future study can be concentrated on selection for qualitative traits of interest.
Źródło:
World Scientific News; 2016, 53, 3; 343-353
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal variation in heavy metal distribution in the sediments of selected dams in Nasarawa State, Nigeria
Autorzy:
Gav, B. L.
Aremu, M. O.
Etonihu, A. C.
Powiązania:
https://bibliotekanauki.pl/articles/1109614.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dams
Heavy metal
Seasonal variations
sediments
Opis:
The study was carried out to ascertain seasonal variation in heavy metal distribution in sediments from Dams located in Nasarawa State, Nigeria. Sediment samples were collected twice each at two different seasons for two years from May to September, 2014 and November-December, 2014 to March, 2015 for wet and dry seasons, respectively. Similarly, sediment samples were collected from May to September, 2015 and November-December, 2015 to March, 2016 for wet and dry seasons, respectively. The samples were then assessed for heavy metal properties, using atomic absorption spectrophotography (AAS). Analysis of variance (ANOVA) was then applied. The mean results of the heavy metal levels showed high values in dry seasons and low values in wet seasons in the two years of the study. Herein, the results of ANOVA revealed significant difference in the heavy metal concentrations between the seasons, dams and years. Our study also indicated that for heavy metals, the levels determined in sediments were within the WHO acceptable standards, except for Pb and Mn. These exceeded the WHO acceptable standards for drinking water. Based on these results, the dam waters are, therefore, polluted and unsuitable for human consumption, except after treatment.
Źródło:
World News of Natural Sciences; 2018, 20; 148-159
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal changes of carbohydrate content in Antarctic krill (Euphausia superba Dana)
Autorzy:
Kołakowski, Edward
Szyper-Machowska, Lidia
Powiązania:
https://bibliotekanauki.pl/articles/2053142.pdf
Data publikacji:
1989
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic krill
carbohydrate fractions
seasonal variations
Źródło:
Polish Polar Research; 1989, 10, 2; 133-139
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improved model of a three phase induction motor incorporating the parameter variations
Autorzy:
Dey, A.
Tripathi, A.
Singh, B.
Dwivedi, B.
Chandra, D.
Powiązania:
https://bibliotekanauki.pl/articles/262793.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
mathematical modeling
transient model
parameter variations
Opis:
A great deal of work is being done on the betterment of control through simulation of the electric drives used for various high-power purposes. The authenticity of the simulated results is based on the accurate modeling of the various parts of the electric drive system. Three–phase Induction motors form an extremely important part of the modern day electric drive system and their usage is continuously on a rise owing to their inherent properties of ruggedness, minimum maintenance requirements and continually increasing efficiencies. Usually the three-phase Induction motor model used in various research works does not incorporate stator and rotor core losses, stator and rotor stray load losses and magnetizing saturation and rotor conductor skin effects. The present paper aims at developing a threephase Induction motor model taking the above losses and effects into account. The dynamic linking of the model to a thermal model considering the temperature dependent resistive elements is an added feature. The motor model described in this paper is the extension of the conventional 2-phase lumped-parameter induction motor model. The biggest advantage is that the model is user-programmable in MA TLAB environment and can be used for system level transient studies. The simulation results of the developed model, with various parameter variations taken into account and subjected to sudden changes in load, show better torque and speed performances of the motor both in steady state and dynamic conditions.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 73-78
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Somaclonal variation during Picea abies and P. omorika somatic embryogenesis and cryopreservation
Autorzy:
Hazubska-Przybył, Teresa
Dering, Monika
Powiązania:
https://bibliotekanauki.pl/articles/952041.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microsatellites
somaclonal variations
somatic embryogenesis
spruce
Opis:
Embryogenic cultures of plants are exposed to various stress factors both in vitro and during cryostorage. In order to safely include the plant material obtained by somatic embryogenesis in combination with cryopreservation for breeding programs, it is necessary to monitor its genetic stability. The aim of the present study was the assessment of somaclonal variation in plant material obtained from embryogenic cultures of Picea abies (L.) Karst. and P. omorika (Pančić) Purk. maintained in vitro or stored in liquid nitrogen by the pregrowth-dehydration method. The analysis of genetic conformity with using microsatellite markers was performed on cotyledonary somatic embryos (CSE), germinating somatic embryos (GSE) and somatic seedlings (SS), obtained from tissues maintained in vitro or from recovered embryogenic tissues (ETc) and CSE obtained after cryopreservation. The analysis revealed changes in the DNA of somatic embryogenesis-derived plant material of both Picea spp. They were found in plant material from 8 out of 10 tested embryogenic lines of P. abies and in 10 out of 19 embryogenic lines of P. omorika after in vitro culture. Changes were also detected in plant material obtained after cryopreservation. Somaclonal variation was observed in ETc and CSE of P. omorika and at ETv stage of P. abies. However, most of the changes were induced at the stage of somatic embryogenesis initiation. These results confirm the need for monitoring the genetic stability of plants obtained by somatic embryogenesis and after cryopreservation for both spruce species.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2017, 59, 1
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationship between CA repeat polymorphism of the IGF-1 gene and the structure of motor skills in young athletes
Autorzy:
Karpowicz, Krzysztof
Krych, Katarzyna
Karpowicz, Małgorzata
Nowak, Witold
Gronek, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1038522.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
genetic variations
motor skills
young athletes
Opis:
The map of candidate genes that can potentially affect physical fitness becomes larger every year, and they are associated with such aspects as respiratory and cardiovascular stability; body build and composition - especially muscle mass and strength; carbohydrate and lipid metabolism; response to training; and exercise intolerance.The aim of this study was to analyze the relationship between the CA repeat polymorphism of the P1 promoter of the IGF1 gene and the structure of motor skills in the two groups of Polish young athletes in 2007-2009. In this study, 350 young sportsmen representing different sports disciplines were examined (age = 15.5 ± 0.5 years), by genotyping the IGF1 gene and determining the structure of motor skills using the International Physical Fitness Test (IPFT) battery. The multiple stepwise regression was used to determine the impact of the investigated motor skills on the indicator of the overall physical fitness, measured by the total score of the International Physical Fitness Test (IPFT). The analysis showed some regularity related to the character of the IGF1 gene polymorphism. It can be concluded that the two groups of young boys athletes practicing various sports disciplines (kinds of physical exercise) displayed similar associations between CA repeat polymorphism of the P1 promoter of the IGF1 gene and the level of motor effects. Our results suggest that this polymorphism may be a genetic marker of the physical performance phenotype. We demonstrated that CA repeat polymorphism of the P1 promoter of the IGF1 gene was associated with strength predispositions in the homozygous and non-carriers groups. In the group who were heterozygous it was speed-strength aptitudes.
Źródło:
Acta Biochimica Polonica; 2018, 65, 1; 43-50
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-dimensional stable Lavrentiev phenomenon with and without boundary conditions
Autorzy:
Caetano, A.
Sarychev, A.
Seabra, D.
Powiązania:
https://bibliotekanauki.pl/articles/970549.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
multidimensional calculus of variations
Lavrentiev phenomenon
Opis:
This work contains examples of regular 2D problems of the Calculus of Variations which exhibit stable Lavrentiev phenomenon, under different types of boundary conditions.
Źródło:
Control and Cybernetics; 2005, 34, 3; 689-707
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of ocean current perturbations using acoustic phase variations
Autorzy:
Zieliński, A.
Butowski, M.
Kraeutner, P.
Powiązania:
https://bibliotekanauki.pl/articles/332840.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
ocean current perturbations
acoustics phase variations
hydroacoustics
Opis:
In this paper, we review an acoustic method for measuring both average ocean current speed and sound speed along an acoustic path. The method requires two or more stations on the sea floor, synchronized through a connecting underwater electric cable, that can transmit and receive an acoustic signal and The method is based on reciprocal acoustic transmissions to determine time of flight in both the forward and reverse directions. A specific implementation of this method is proposed. We also consider a novel method for monitoring ocean current perturbations through acoustic phase measurements. In simplest form, a continuous sinusoidal signal is transmitted from one station to a second station. Any variations in ocean current speed will introduce a phase shift in the received signal proportional to the time derivative of the current speed. This effect has been demonstrated through ultrasonic in-air experiments. Finally, the two methods are combined into a single system that continuously measures small-scale ocean current velocity changes.
Źródło:
Hydroacoustics; 2009, 12; 237-248
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation of the cholesterol content in breast milk during 10 days collection at early stages of lactation
Autorzy:
Kamelska, Anna
Pietrzak-Fiećko, Renata
Bryl, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1039741.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
FTIR-ATR spectroscopy
human milk
cholesterol variations
Opis:
More and more research is done concerning nutritional programming. Human milk nutrients which are consumed by infants can influence their health in later life. High level of cholesterol in human milk paradoxically lowers the cholesterol concentration in blood in adults. During the course of human lactation the cholesterol concentration decreases from 31 mg/100cm3 (colostrum) to 16 mg/100 cm3 (mature milk). According to Scopesi et al., 2002, Clin Nutr 21: 379-384, cholesterol concentration in mature milk ranged from 6.5 to 18.4 mg/100 cm3. The aim of the study was to assess the variations in breast milk cholesterol content during 10 day collection at early lactation. 48 samples of human milk were analyzed. Mean age of women was 31 years. Women were collecting samples during 10 days of an early lactation stage (1-3 months after delivery). An Attenuated Total Reflectance Fourier Transformed Infrared (FTIR-ATR) method for easy and rapid determination of cholesterol in human milk was elaborated. Cholesterol content assessed by the FTIR method ranged from 3.36 to 12.98 mg/100 cm3. Results indicate that milk cholesterol concentration during 10 consecutive days of early lactation is highly variable. Cholesterol content depends on an individual. Therefore it is suggested that not only the period of lactation but also mother's diet, age, season and place of residence are important factors determining cholesterol content.
Źródło:
Acta Biochimica Polonica; 2012, 59, 2; 243-248
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Workpiece temperature variations during flat peripheral grinding
Autorzy:
Smirnov, V. A.
Repko, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/409773.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
cutting force
cutting grains
flat grinding
temperature variations
Opis:
The paper presents the results of researches of temperature variations during flat peripheral grinding. It is shown that the temperature variations of the workpiece can reach 25...30% of the average values, which can lead to some thermal defects. A nonlinear two-dimensional thermophysical grinding model is suggested. It takes into account local changes in the cutting conditions: the fluctuation of the cut layer and the cutting force, the thermal impact of the cutting grains, and the presence of surface cavities in the intermittent wheel. For the numerical solution of the problem, the method of finite differences is adapted. Researches of the method stability and convergence are made, taking into account the specific nature of the problem. A high accuracy of the approximation of the boundary conditions and the nonlinear heat equation is provided. An experimental verification of the proposed thermophysical model was carried out with the use of installation for simultaneous measurement of the grinding force and temperature. It is shown that the discrepancy between the theoretical and experimental values of the grinding temperature does not exceed 5%. The proposed ther-mophysical model makes it possible to predict with high accuracy the temperature variations during grinding by the wheel periphery.
Źródło:
Management Systems in Production Engineering; 2018, 2 (26); 93-98
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cycle-to-cycle variations of a diesel engine operating with palm biodiesel
Autorzy:
Yasin, M. H.
Mamat, R.
Abdullah, A. A.
Abdullah, N. R.
Wyszynski, M. L.
Powiązania:
https://bibliotekanauki.pl/articles/950092.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
cycle-to-cycle variations
biodiesel
combustion
diesel engine
Opis:
Biodiesel is one of biodegradable and renewable fuel, which is originated from vegetable oil or animal fats. Different fuel properties of biodiesel produce different combustion characteristics which slightly differ to mineral diesel. Combustion studies on palm-biodiesel and mineral diesel were conducted using a multi-cylinder diesel engine operating at medium engine load at 2500 rpm. The engine was water cooled inline four cylinder diesel engines without exhaust gas recirculation system. Cycle-to-cycle variations of peak cylinder pressure and mean indicated pressure of the test fuels were determined for the combustion characteristics of diesel engine. In-cylinder pressure data for the 200 consecutive cycles were determined using a Kistler pressure transducer and recorded into a combustion analyser. Three different engine loads: 20%, 40% and 60% were selected in this study with a constant engine speed of 2500 rpm. The results show that at lower load, in-cylinder pressure variations for palm biodiesel were lower compared to mineral diesel. However, at medium and high loads, palm biodiesel has dominated the peak cylinder variations. Different combustion cyclic variations for mineral diesel and B100 are observed and generally influenced by psychochemical properties differences including viscosity and density of fuel.
Źródło:
Journal of KONES; 2013, 20, 3; 443-450
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized Isoperimetric FVPs Via Caputo Approach
Autorzy:
Taïeb, Amele
Dahmani, Zoubir
Powiązania:
https://bibliotekanauki.pl/articles/2188101.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Caputo derivative
Fractional calculus of variations
isoperimetric problems
Opis:
In this paper, we study several fractional variational problems with functionals that contain n unknown functions with their higher order Caputo derivatives and Riemann–Liouville integrals. We prove generalized fractional Euler–Lagrange equations. We also study an isoperimetric problem with multiple constraints, and we find the optimality conditions. Some examples are provided to illustrate the applications of the results.
Źródło:
Universitatis Iagellonicae Acta Mathematica; 2019, 56; 23-40
2084-3828
0083-4386
Pojawia się w:
Universitatis Iagellonicae Acta Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Basic physical properties of Norway spruce (Picea abies (L.) Karst.) seeds
Autorzy:
Kaliniewicz, Z.
Markowski, P.
Anders, A.
Jadwisieńczak, B.
Rawa, T.
Szczechowicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/298166.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
seed
dimension
seed mass
range of variations
correlation
separation
Opis:
The range of variations in a given separation parameter and its relationships with other attributes have to be determined for designing seed cleaning and sorting processes. In this study, those relationships were determined for five batches of Norway spruce seeds supplied by a seed extraction plant in Jedwabno. The seeds were harvested from seed stands in northern Poland. The terminal velocity, length, width, thickness and mass of every seed were determined. The results were used to calculate the geometric mean diameter, aspect ratio, sphericity index and density of the evaluated seeds. Those parameters were compared by analysis of variance and linear correlation analysis. Similarities in the average values of all physical properties were noted only between seeds harvested in the same seed zone, from tree stands occupying the same habitat type. The analyzed seeds can be effectively separated into mass fractions with the use of traditional sorting devices such as pneumatic separators, mesh sieves with longitudinal or round openings, cylindrical graders, winnowing machines and pneumatic sieves, in order to achieve more uniform seedling emergence when each seed fraction is sown separately.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(2); 103-115
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extensions of the control variational method
Autorzy:
Sprekels, J.
Tiba, D.
Powiązania:
https://bibliotekanauki.pl/articles/206097.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
calculus of variations
contact problems
evolution problems
Opis:
The control variational method is a development of the variational approach, based on optimal control theory. In this work, we give an application to a variational inequality arising in mechanics and involving unilateral conditions both in the domain and on the boundary, and we explore the extension of the method to time-dependent problems.
Źródło:
Control and Cybernetics; 2011, 40, 4; 1099-1108
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On a variational approach to the problem of singular geological structures
O wariacyjnym podejściu do problemu osobliwych struktur geologicznych
Autorzy:
Tomecka-Suchoń, S.
Powiązania:
https://bibliotekanauki.pl/articles/394277.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
variations of functional
fault formation
rachunek wariacyjny
tworzenie uskoku
Opis:
Recognition of geological structures often requires understanding the causes of diverse kinetic phenomenon and its underlying foundations. This pertains, e.g., to the phenomenon of mass movement within a rock formation leading to fault formation. We discuss here the possibility that variational calculus may be an important tool for investigating this problem. Analysis of variations may yield important information concerning a physical phenomenon. Here we will neglect the best known problems of extremals in the analysis of variations and will focus our attention on electromagnetic and physico-mechanical problems. Adaptation of a Hamiltonian as an entropy operator may serve, not only for the problems of singular crystalline structures, but also geological singularities such as faults, oleate impermeabilities, deep-seated eruptions as well as in problems of seismology, vulcanology and earthquakes. This paper is an attempt to initiate a discussion about the possible development of the ideas presented. It might be that the formulae presented will be useful for the solution of other geophysical problems in future.
Poznanie geologicznych struktur często wymaga zrozumienia przyczyn kinetyki zjawiska przy uwzględnieniu jego zasadniczych podstaw. Takie ujęcie umożliwia nam powiązanie skutków procesów z przyczynami je warunkującymi. Dotyczy to wielu zjawisk, na przykład transportu masy wewnątrz górotworu prowadzącego do powstania uskoku. Rozważamy możliwość zastosowania rachunku wariacyjnego w rozwiązywaniu wspomnianego zagadnienia, zachęcając jednocześnie do krytycznego oglądu i własnych przemyśleń. Przy pomocy analiz wariacyjnych uzyskać możemy wiele informacji o zjawisku fizycznym. Wyłączeniu ulegną najbardziej znane problemy ekstremali, które zostaną w znacznej części pominięte, natomiast całkowicie skupimy się na zagadnieniach elektromagnetycznych i mechanicznych. Adaptacja hamiltonianu jako operatora entropijnego służyć może nie tylko problematyce osobliwych struktur krystalicznych, ale również problematyce osobliwych struktur geologicznych, takich jak uskoki, pułapki naftowe, erupcje wgłębne czy w zagadnieniach sejsmologii, wulkanologii czy trzęsień ziemi. Niniejsza praca jest próbą zachęty do dyskusji nad rozwinięciem tego zagadnienia. Trzeba też zauważyć, że rachunek wariacyjny może okazać się przydatny w rozwiązywaniu innych problemów geofizycznych, co nastąpi w nieodległej przyszłości.
Źródło:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2017, 101; 335-345
2080-0819
Pojawia się w:
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 63

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