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Tytuł:
A fusion-fission hybrid reactor driven by high-density pinch plasmas
Autorzy:
Zoita, V.
Lungu, S.
Powiązania:
https://bibliotekanauki.pl/articles/146261.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
CANDU
high-density pinch
hybrid reactor
plasma focus
Opis:
A conceptual design for a 200 MW hybrid fusion-fission reactor to be used as a heat source for district heating has been developed. The fission, heat-generating blanket is based on the CANDU reactor technology, while the fusion fast neutrons are provided by a high-density, pinch plasma. The basic assumption regarding the fusion neutron source is that in a pinch plasma (high-density Z-pinch and plasma focus configurations have been considered) a fusion power level of 10 MW can be achieved. An outstanding feature of the design is that no active components are necessary within the reactor containment area, all the hybrid system control being ensured by the fusion component of the reactor.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 81-84
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wireless at the "Connected Games": How the London 2012 Olympic and Paralympic Games Utilized the Latest Wi-Fi Technology
Autorzy:
Leonhardt, P.
Powiązania:
https://bibliotekanauki.pl/articles/307834.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
high density Wi-Fi
olympics
paralympics
WiFi
wireless
Opis:
The London 2012 Olympic and Paraolympic Games drew together tens of thousands of people in the form of athletes, organisers, media, VIPs, public and many more groups and individuals. With the growth in smart phones and tablets coupled with the ever expanding volume and range of content accessed via Aps and browsers, this huge volume of people expected connectivity from their mobile devices during their time on the Olympic sites. It was BT's role in the games as the official communications services partner to deliver Wi-Fi connectivity across the venues, covering the range of users from the public, athletes, organisers and ticket scanners. This paper examines this state of the art Wi-Fi solution.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 1; 5-10
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The association between cardiorespiratory fitness and metabolic syndrome diagnosis: A cross-sectional study in Indonesian middle-aged and older adults
Autorzy:
Arovah, Novita Intan
Heesch, Kristiann C.
Powiązania:
https://bibliotekanauki.pl/articles/1933084.pdf
Data publikacji:
2021-10-20
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
abdominal obesity
hyperglycaemia
triglyceride
high density of lipoprotein
hypertension
Opis:
Objectives: The roles of cardiorespiratory fitness (CF) in reducing cardiovascular disease (CVD) and allcause mortality risks are well established; however, little is known about the role of CF in reducing risk of metabolic syndrome (MetS), a cluster of CVD risk factors, particularly in Asian countries. This research examined associations between CF and MetS diagnosis and its five components in Indonesian middle-aged and older adults. Methods: This cross-sectional study included 161 participants (aged 63±8 years; 70% female). CF was assessed with a 6-minute walk test. MetS diagnosis and its components were assessed with the Adult Treatment Panel III. Logistic regression modelling was conducted to examine the relationships between CF and MetS diagnosis and its components, after adjustment for BMI and other confounders. BMI was categorized using cut-points for Asians. Results: In adjusted models, participants with low CF had a greater likelihood of being diagnosed with MetS than those with high CF (OR=4.79, 95%CI:2.17-10.62). They were also more likely to have low highdensity lipoprotein (OR=2.07, 95%CI:1.02-4.18) or hypertriglyceridemia (OR=2.37, 95%CI:1.15-4.86). There was also borderline significant findings that suggested that participants with low CF had greater likelihood of having abdominal obesity (OR=2.34, 95%CI:0.97-5.65, p=0.06) or hyperglycaemia (OR=2.07 95%CI:0.98-4.41, p=0.06). Conclusions: Low CF is associated with increased likelihood of being diagnosed with MetS. The adverse effects of low CF are mainly characterized by dyslipidaemia. Public health messages should emphasise the importance of improving CF for preventing MetS. Assessment of CF could be useful for targeting individuals most likely to benefit from intervention to prevent MetS.
Źródło:
Physical Activity Review; 2021, 2, 9; 101-110
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a Composite Propellant Formulation with a High Performance Index Using a Pressure Casting Technique
Autorzy:
Ramesh, K.
Jawalkar, S. N.
Sachdeva, S.
Bhattacharya, B.
Powiązania:
https://bibliotekanauki.pl/articles/358322.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
composite propellant
high density
high performance index
pressure casting
solid loading
Opis:
There is a continuous demand for high performance composite propellant formulations to meet future requirements. The performance of composite propellant formulations can be enhanced by the addition of energetic oxidizers, like ADN/HNF as well as an energetic binder & a plasticizer. However, on incorporation of energetic ingredients, the composition becomes sensitive, and thus processing, handling and transportation pose a greater threat. Therefore, a moderately high burn rate composition having a burn rate ~ 13-14 mmźs -1 at 7000 kPa was tailored by increasing the solid loading of the propellant from 85.15% to 87.27% with the help of ammonium perchlorate and process aids without affecting the burn rate and mechanical properties. The tailored composition was studied for different properties such as end of mix viscosity, density, mechanical & ballistic properties. The evaluated data reveal that the end of mix viscosity of the tailored composition is higher than the base composition, i.e., 672 Paźs and 2340 Paźs at the same temperature; however, this viscosity was castable using a pressure casting technique. The properties of the cured propellant reveal that there is an enhancement of density from 1.74 gźcm -3 to 1.79 gźcm -3 with no other changes in mechanical properties. The performance index of the tailored composition has been increased from 416 to 437, well supported by results of ballistic evaluation motors of 2 kg.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 1; 49-58
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The properties of Lightweight Stabilised Blockboard panels
Autorzy:
Roziņš, Rihards
Iejavs, Jānis
Jakovļevs, Vilnis
Spulle, Uldis
Powiązania:
https://bibliotekanauki.pl/articles/2010850.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
Lightweight Stabilised Blockboard
physical properties
mechanical properties
high density fibreboard
Opis:
Lightweight Stabilised Blockboard (LSB) panel is a product newly introduced onto the market. Research was carried out to determine the main physical and mechanical properties of the panel and to evaluate the effect of panel direction and moisture content. LSB panels have wide potential for application in the furniture industry, door production, transport, and construction board production. Potentially LSB panels are lighter, with lower density and higher form stability than solid wood and conventional fibreboard, particle board, oriented strand board (OSB) and plywood. LSB panels produced from solid pine wood core and High Density Fibreboard (HDF) skins are found to have the following physical properties: average moisture content 8.6%; density 450 kg·m,-3; shrinkage coefficients 0.36% %-1 for thickness and 0.25%·%-1 for length and width; thickness swelling 6.3% after 24 hours’ immersion in water. The following mechanical properties were determined: internal bond 0.51 N mm-2; screw withdrawal resistance 1076 N from plane and 553 N from edge; bending strength 13.4 N mm-2; and modulus of elasticity in static bending 1754 N mm-2.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2020, 63, 206; 103-119
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Calcium Carbonate Filler on HDPE Pipe
Autorzy:
Kherici, Samira
Benouali, Djillali
Nouredine, Chekhar
Powiązania:
https://bibliotekanauki.pl/articles/2201739.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
composite
HDPE
CaCO3
ring stiffness
MFI
high density polyethylene
Opis:
The objective of this work is the preparation and the characterization of high density polyethylene /calcium carbonate (HDPE/CaCO3) composites. Polyethylene composites, containing 10-35 wt. % of CaCO3 and HDPE with MFI (Melt Flow index) (0.550 g/10mn) were prepared with co-extrusion process using extruder type Cincinati 90D. Thermal and mechanical studies were made in order to determine the parameters for obtaining a material (corrugated pipe) with optimal properties. The composite viscosity increased with filler content, suggesting the formation of filler agglomerates. Thermal analysis shows that addition of 30 % CaCO3 increased the thermal stability of HDPE around 32°C, decreasing the processing temperature of composites in 15°C. Regarding to the mechanical tests, the ring stiffness of the composites decreased with the addition of CaCO3. According to the obtained results, we suggest that HDPE/CaCO3 composites could be used in the pipe production where tensile strengths higher than 25 MPa are not required and for service temperatures between 30°C and 70°C.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 213--218
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inicjalizacja segmentacji k-means uwzględniająca rozkład gęstości pikseli
Autorzy:
Świta, R.
Suszyński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/118366.pdf
Data publikacji:
2014
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
FA
KKZ
k-means
kmeans++
segmentacja
k-means ++
segmentation
High Density
Opis:
Artykuł przedstawia modyfikację inicjalizacji KKZ algorytmu k-means, uwzględniającą, oprócz wzajemnych odległości środków segmentów, również rozkład gęstości pikseli. Funkcja gęstości piksela jest sumą odwrotności odległości piksela od pozostałych i jest poddawana oszacowaniu na podstawie odległości piksela od wartości średniej i wariancji wartości pikseli. W eksperymentach segmentacji podlegały cztery różne sekwencje obrazów termicznych uzyskanych metodą termografii aktywnej. Pomimo dodatkowych obliczeń podczas inicjalizacji, metoda wykazała szybszą zbieżność algorytmu z czasami bardzo podobnymi do inicjalizacji KKZ, ale mniejszym błędem końcowym segmentacji.
This article presents a modification for the KKZ initialization of the k-means segmentation algorithm, which, in addition to the mutual distance of segments, takes into account the density of pixels. Pixel density is expressed asa sum of the inverse of the pixel’s distance to the other pixels and is subjected to estimation based on the distance from the mean and variance of the pixel values. In the experiments, four different sequences of thermal images were used, obtained using active thermography. Despite the additional calculations during initialization, method showed a faster convergence of the algorithm, with processing times very similar to the KKZ initialization, but with a lower final segmentation error.
Źródło:
Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej; 2014, 6; 89-98
1897-7421
Pojawia się w:
Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aminonitronaphthalenes as Possible High Energy Density Materials
Autorzy:
Murawski, R. J.
Ball, D. W.
Powiązania:
https://bibliotekanauki.pl/articles/358002.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
high energy density materials
aminonitronaphthalenes
density functional theory calculations
Opis:
As part of a series of studies evaluating the thermodynamic properties of new potential high energy materials, a series of calculations was performed on a variety of naphthalene molecules having amino and nitro groups. Calculations on seven aminonitronaphthalene molecules were performed, determining their minimum-energy geometries, vibrational frequencies, and energies. Enthalpies of formation were determined using atomization reactions, and subsequently enthalpies of combustion or decomposition were determined. Specific enthalpies of decomposition ranged from 4.1-4.8 kJ/g, while specific enthalpies of combustion ranged more widely, from 13 to almost 21 kJ/g. Some detonation properties of some of the derivatives rival those of current HEDMs.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 1; 3-12
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mechanical properties of a mixture of high density polyethylene and calcium carbonate dedicated for packaging
Właściwości mechaniczne mieszaniny polietylenu dużej gęstości i węglanu wapnia przeznaczonej na opakowania
Autorzy:
Garbarski, J
Fabijański, M
Powiązania:
https://bibliotekanauki.pl/articles/175713.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high density polyethylene
packaging
calcium carbonate
polietylen dużej gęstości
opakowania
węglan wapnia
Opis:
Packaging made of polymeric materials is one of the most important branches of polymer processing. A very essential task which is to be solved in this area, is searching for new materials which would allow for lowering the cost while still maintaining good mechanical properties. In the current paper the attempt to decrease the cost of the HDPE intended for blow moulding of packaging by admixing CaCO3 filler is presented. The dependence of mechanical properties upon the filler content is also shown.
Opakowania wykonane z materiałów polimerowych stanowią duży obszar przetwórstwa materiałów polimerowych. Podstawowym zadaniem w tym zakresie jest wciąż poszukiwanie nowych materiałów umożliwiających zmniejszenie kosztów i zachowanie dobrych właściwości mechanicznych. W pracy podjęto próbę zmniejszenia kosztów HDPE przeznaczonego do wytwarzania opakowań przez wprowadzenie CaCO3 jako wypełniacza. Określono zmianę właściwości mechanicznych tych materiałów w zależności od zawartości napełniacza.
Źródło:
Advances in Manufacturing Science and Technology; 2013, 37, 2; 91-96
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bezemisyjny ciągnik podwieszany GAD-1 o napędzie akumulatorowym
No emissions GAD-1 suspended locomotive with electric drive
Autorzy:
Niedziela, Bogusław
Kasperek, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1841102.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
akumulator
duża gęstość energii
battery
high energy density
Opis:
Wprowadzanie do eksploatacji w podziemiach kopalń węgla coraz większej liczby napędów spalinowych stwarza znaczny dyskomfort pracy załóg górniczych, związany ze stężeniem spalin i emitowanym ciepłem. Bezemisyjny ciągnik podwieszony GAD-1 o napędzie akumulatorowym, wyposażony w ogniwa najnowszej generacji, może stanowić korzystną alternatywę w odniesieniu do urządzeń transportowych o napędzie spalinowym.
Introduction of growing number of diesel drives to mine undergrounds creates a significant discomfort of work associated with concentration of exhaust gases and with generated heat. Emission-free GAD-1 suspended locomotive with electric drive, equipped with state-of-the-art batteries, can be an alternative design or can be a completion to diesel transportation machines.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2019, 8, 1; 247-251
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison between the Tensile, Water Absorption and Flammability Properties of Recycled High-Density Polyethylene/Rice Husk Composite from Twin-Screw Extruder and Heated Two-Roll Mill
Autorzy:
Salleh, Mohd Nazry
Aziz, Roslaili Abdul
Shan, Chen Ruey
Musa, Luqman
Razak, Mohd Fairul Sharin Abdul
Nabiałek, Marcin
Jeż, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/2106584.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
recycled high-density polyethylene
rice husk
twin-screw extruder
heated two-roll mill
Opis:
This study compares the mechanical properties of recycled high-density polyethylene (r-HDPE)/rice husk (RH) composites from a twin-screw extruder and a heated two-roll mill, and the effect of different filler loadings using different melt blending processes on the mechanical properties of r-HDPE/RH composites. Polyethylene-graft-maleic anhydride (MAPE) acts as the coupling agent to enhance interfacial bonding between the fibre and the polymer matrix. The filler loading used was in the range of 10-40 wt. %. In this work, r-HDPE/RH blends were prepared using a twin-screw extruder and a heated two-roll mill. The ratio of 70/30 twin-screw extruder compounded composites significantly showed higher tensile based on improved to about 45.5% at 11 MPa compared to those compounded in the heated two-roll mill. The same ratio showed an increment almost up to 9% of elongation at break. It has also been verified that the higher filler loading used reduced the tensile strength and elongation at break, while the Young’s modulus increased. The result was evidenced by the increase in water absorption and longer burning time as the filler loading increased.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 661--668
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small high density lipoprotein subclasses: some of their physico-chemical properties and stability in solution.
Autorzy:
Atmeh, Ragheb
Abd Elrazeq, Issa
Powiązania:
https://bibliotekanauki.pl/articles/1041440.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
small high density lipoproteins
diffusion coefficient
surface charge
molecular shape
coefficient of friction
stability
Opis:
Small high density lipoproteins (SHDL) contribute to the protection from atherosclerosis, but detailed information about their properties is not available yet. We isolated four of the smallest HDL subclasses that contain apoA-I alone, the small lipoprotein A-I (SLpAI), by their separation on gradient polyacrylamide gel followed by electroelution. Their physico-chemical properties were calculated from their displacement in non-denaturing gradient polyacrylamide gel under the effect of electrical potential. The properties are: Stokes' radii 2.96-3.56 nm; molecular masses 42-70 kDa; net negative charge 7.2-13.5; surface charge densities 3139-4069 -esu∙˙cm^(-2); surface potentials 10.6-15.7 -mV; coefficients of friction 5.74-6.90 × 10-8 g∙˙s^(-1); and diffusion coefficients 5.76-6.94 7× 10-7 cm^2∙˙s^(-1). We found that these particles were of low stability as they underwent molecular transformation into larger particles on storage. The estimated dimensions of these particles do not support ellipsoidal shape, therefore, the most probable shape is spherical; consequently, their hydrated characteristics were estimated. We conclude that these particles have high values of negative surface charge and diffusion coefficients, and are of low stability. Their small Stokes' radii were similar to each other and they are spherical and highly hydrated.
Źródło:
Acta Biochimica Polonica; 2005, 52, 2; 515-525
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study on Nitroimine Derivatives of Azetidine as High-Energy-Density Compounds
Autorzy:
Li, Bu-tong
Li, Lu-lin
Powiązania:
https://bibliotekanauki.pl/articles/358762.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
high-energy-density compounds
Kamlet-Jacobs equations
azetidin derivatives
Opis:
A series of derivatives of azetidine were designed by stepwise replacing the hydrogen atoms of azetidine with nitroimine groups. At the G3MP2 level, the heats of formation (HOFs), bond dissociation energies (BDEs), molecular densities (ρ0), detonation velocities (D), and detonation pressures (P) of the nitroimine-substituted azetidines were investigated to look for high-energy-density compounds (HEDCs). It was found that the nitroimine-substituted azetidines have high HOFs and large BDEs, and sufficient thermal and kinetic stability. Furthermore, the covalent bond strength in the four-membered ring, accompanied by intramolecular hydrogen bonds, are the determining factors for isomer stability. Based on our calculations, derivatives E and F have better detonation performance than RDX and can be regarded as potential high-energy-density compounds. This work may provide basic information for further study of the title compounds.
Źródło:
Central European Journal of Energetic Materials; 2020, 17, 1; 107-118
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design methods for limiting rotor losses in a fractional slot PMSM motor with high power density
Autorzy:
Wolnik, Tomasz
Opach, Szczepan
Cyganik, Łukasz
Jarek, Tomasz
Szekeres, Vojtech
Powiązania:
https://bibliotekanauki.pl/articles/2172802.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional slot motors
high power density motor
rotor losses
Opis:
Fractional slot PMSM motors enable high power density factors to be obtained provided that their electromagnetic circuit, appropriate mechanical structure and cooling system are properly designed, as well as when operating at a high frequency of power supply voltage (400–800 Hz) with high magnetic saturation and high current loads (approx. 12–15 A/mm2). Such operating conditions, especially in the case of fractional slot motors, may be the reason for excessive rotor losses, mainly in the rotor yoke and permanent magnets. One of the conditions for obtaining high values of continuous power of the motor is the reduction of these losses. This paper presents selected design methods for limiting the value of rotor losses with simultaneous consideration of their influence on other motor parameters. The analysiswas carried out for a PMSM motor with an external rotor weighting approx. 10 kg and a maximum power of 50 kW at a rotational speed of 4 800 rpm.
Źródło:
Archives of Electrical Engineering; 2022, 71, 4; 963--979
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between Microstructure and Exothermic Reaction Kinetics of Al-CuO Thermite Nanocomposite Powders Fabricated by Cryomilling
Autorzy:
Oh, Minseok
Kim, Kwanil
Ahn, Byungmin
Powiązania:
https://bibliotekanauki.pl/articles/355529.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-CuO
thermite
nanocomposite
cryomilling
high energy density materials
Opis:
Al-CuO is a thermite material exhibiting the exothermic reaction only when aluminum melts. For wide spread of its applica-tion, the reaction temperature needs to be reduced in addition to the enhancement of total reaction energy. In the present study, a thermite nanocomposite with a large contact area between Al and CuO was fabricated in order to lower the exothermic reaction temperature and to improve the reactivity. A cryomilling process was performed to achieve the nanostructure, and the effect of composition on the microstructure and its reactivity was studied in detail. The microstructure was characterized using SEM and XRD, and the thermal property was analyzed using DSC. The results show that as the molar ratio between Al and CuO varies, the fraction of uniform nanocomposite structure was changed affecting the exothermic reaction characteristics.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 931-934
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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