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Tytuł:
Mouldability and its Recovery Properties of 2D Plain Woven Para-Aramid Fabric for Soft Body Armour Applications
Formowalność i odprężenie elastyczne tkaniny p-aramidowej 2D stosowanej w miękkich pancerzach
Autorzy:
Abtew, Mulat A.
Loghin, Carment
Cristian, Irina
Boussu, François
Bruniaux, Pascal
Chen, Yan
Wang, Lichuan
Powiązania:
https://bibliotekanauki.pl/articles/233652.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
mouldability
moulding recovery
woven para-aramid fabric
fabric layers
soft body armour
formowalność
odzyskiwanie form
tkanina para-aramidowa
warstwy tkaniny
pancerz
Opis:
Mouldability, along with other mechanical properties, is a very crucial material parameter in various technical textile applications, from composites to soft body armour products. Moreover, the mouldability and recovery behaviours of the material will be affected by various internal and external paramters before, during and after the forming process. The current research particularly tried to study the effects of blank-holder pressure (BHP) and the number of layers not only on the moulding characterstics but also on the recovery behaviour of plain woven p-aramid fabrics made from a high-performance yarn with a linear density of 930 dTex. Samples with various numbers of layers were arranged in the same orientation for the moulding process. The moulding approach utilised a specific moulding device in a low-speed forming process and a predefined semi-hemispherically shaped punch for all specimens.Various important dry textile material moulding characteristics and, most importantly, the moulding recovery properties, such as warp and weft direction drawing-in recovery, center high-point recovery, shear angle recovery etc. were investigated.
Formowalność wraz z innymi właściwościami mechanicznymi jest bardzo ważnym parametrem materiałowym w różnych technicznych zastosowaniach tekstylnych, od kompozytów po miękkie pancerze. Ponadto na formowalność i odprężenie elastyczne materiału mają wpływ różne parametry wewnętrzne i zewnętrzne przed, podczas i po procesie formowania. W pracy szczególnie starano się zbadać wpływ nacisku ślepej próby (BHP) i liczby warstw nie tylko na charakterystykę formowania, ale także na odprężenie elastyczne tkanin p-aramidowych wykonanych z wysokowydajnej przędzy o gęstości liniowej 930 dTex. Próbki o różnej liczbie warstw ułożono w tej samej orientacji do procesu formowania. Zbadano cechy formowania materiału tekstylnego oraz, co najważniejsze, odprężenie elastyczne zarówno w kierunku osnowy i wątku.
Źródło:
Fibres & Textiles in Eastern Europe; 2019, 6 (138); 54-62
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tibial tuberosity. Trochlear groove distance in symptom-free young subjects and the proposal for a new guideline value to evaluate patellofemoral pain syndrome in case of trochlea dysplasia
Autorzy:
Alk, A.
Bantle, V.
Martin, T.
Wang, R.
Kasprzyk, M.
Kozak, J.
Powiązania:
https://bibliotekanauki.pl/articles/2063813.pdf
Data publikacji:
2018
Wydawca:
Międzynarodowe Stowarzyszenie na rzecz Robotyki Medycznej
Tematy:
zespół bólu rzepkowo-udowego
kolano biegacza
mobilny system ultrasonograficzny oparty na smartfonie
patellofemoral pain syndrome
PFPS
TT-TG
smartphone-based mobile sonography system
Opis:
For the evaluation of the patellofemoral pain syndrome (PFPS) the mediolateral distance between the tibial tuberosity and the trochlear groove (TT-TG) is considered as the gold standard. In this work, we propose to replace the measurement of the TT-TG with conventional tomographic or radiological section images by a smartphone-based mobile sonography system. This new system allows to provide not only ultrasound imaging but also a measuring method for determining the TT-TG using a smartphone as a mobile tracking unit. Moreover, the system supports the diagnosis by acquiring an additional parameter: the mediolateral distance between the intercondylar notch and the tibial tuberosity (TT-IN). The distinctive structure of the intercondylar notch simplifies the examination compared to using the trochlear groove alone. A feasibility study conducted for this paper indicates that this second guideline value is an adequate replacement for the conventional measurement of the TT-TG. Especially in case of trochlea dysplasia the detection and definition of the groove may be difficult and the TT-IN value offers a reasonable alternative. Our study shows that the proposed sonography system is able to accurately determine the TT-TG in a population of symptom-free young subjects. These measurements range from 13.1 ± 4.2 mm for male to 14.8 ± 3.4 mm for female subjects. Our findings correspond to the postulated values of the gold standard. We are able to show that the values for the TT-IN are in a comparable range with 14.4 ± 4.1mm for men and 13.6 ± 4.0 mm for women. We are convinced that this study strongly indicates that the TT-IN is a useful value that is easy to measure with a mobile ultrasound-based measurement system and can provide the same level of diagnostic value compared to the gold standard TT-TG. In conclusion, a new guideline value is presented to complement the measurement of the TT-TG when a pathological anatomy prevents the detection of the groove.
Źródło:
Medical Robotics Reports; 2018, 7; 26--30
2299-7407
Pojawia się w:
Medical Robotics Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity analysis of multiple fault test and reliability measures in integrated GPS/INS systems
Autorzy:
Almagbile, A.
Wang, J.
Ding, W.
Knight, N.
Powiązania:
https://bibliotekanauki.pl/articles/130262.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geodetów Polskich
Tematy:
GPS/INS integration
Kalman filtering
multiple faults
reliability measures
sensitivity analysis
integracja systemów GPS/INS
filtracja Kalmana
uszkodzenia wielokrotne
miary niezawodności
analiza wrażliwościowa
Opis:
Based on Kalman filtering, multi-sensor navigation systems, such as the integrated GPS/INS system, are widely accepted to enhance the navigation solution for various applications. However, such integrated systems do not always provide robust and stable navigation solutions due to unmodelled measurements and system dynamic errors, such as faults that degrade the performance of Kalman filtering for such integration. Single fault detection methods based on least squares (snapshot) method were investigated extensively in the literature and found effective to detect the fault at either sensor level or integration level. However, the system might be contaminated by multiple faults simultaneously. Thus, there is an increased likelyhood that some of the faults may not be detected and identified correctly. This will degrade the accuracy of positioning. In this paper multiple fault test and reliability measures based on a snapshot method were implemented in both the measurement model and the predicted states model for use in a GPS/INS integration system. The influences of the correlation coefficients between fault test statistics on the performances of the faults test and reliability measures were also investigated. The results indicate that the multiple fault test and reliability measures can perform more effectively in the measurement model than the predicted states model due to weak geometric strength within the predicted states model.
Źródło:
Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2011, 22; 25-37
2083-2214
2391-9477
Pojawia się w:
Archiwum Fotogrametrii, Kartografii i Teledetekcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
METHOD VALIDATION AND STABILITY STUDIES OF DIFFERENTIAL ACTIVITY OF HYDROXYPROPYL-β-CYCLODEXTRIN AND HYDROPHILIC CARRIERS OF CARVEDILOL.
Autorzy:
Boakye-Yiadom, Kofi O.
Kesse, Samuel
Korto, Kwabena
Sarkodie, Emmanuel K.
Baidoo, Sarah A.
Filli, Mensura S.
Wang, Bo
Powiązania:
https://bibliotekanauki.pl/articles/895503.pdf
Data publikacji:
2020-07-10
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
method validation
Carvedilol
stress conditions
solid dispersion
percentage degradation
reverse phase liquid chromatography
Opis:
Stability studies of the formulations of CAR solid dispersions were analyzed at 300C/65%RH for a period of three months. A simple reverse phase HPLC was developed and validated for the quantification of CAR solid dispersions. Chromatographic separation was achieved on Waters Atlantis dC18 (4.6 X 150mm) column with a mobile phase consisting of 0.033M phosphate buffer and methanol (35:65). The mobile phase was filtered using an organic filter paper and sonicated for about 20 min. The flow rate was 1ml/min and 242nm wavelength was used for detection. Force degradation studies were conducted under three conditions namely; acidic, basic and hydroxide peroxide conditions. With the HPLC linearity concentration was in the range of 5-80μg/ml with a correlation coefficient (R2) of 0.9995. There was no interference with drug carriers. The suggested reverse phase HPLC methodology is simple, selective, linear and robust in quantifying the amount of CAR in the various solid dispersion samples. In hydrogen peroxide a degraded product was found on the chromatogram unlike that of the acidic and basic conditions. Degradation occurred more strongly in the acidic condition than in the basic condition. The binary systems were less stable than the ternary system solid dispersions due to the presence of HP-β-CD.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 3; 423-430
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-objective optimization of stope structure parameters in broken rock conditions using grey relational analysis
Wielo-kryterialna optymalizacja parametrów struktury przodka wybierkowego w warunkach pękania skał przy wykorzystaniu „szarej” analizy relacyjnej
Autorzy:
Chen, S.
Wu, A.
Wang, Y.
Cheng, X.
Powiązania:
https://bibliotekanauki.pl/articles/219180.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
szara analiza relacyjna
parametry struktury przodka wybierkowego
pękanie skał
symulacje numeryczne
model Taguchi projektowania eksperymentu
grey relational analysis
stope structure parameters
in broken rock conditions
numerical simulation
taguchi experiment design
Opis:
In order to optimize the stope structure parameters in broken rock conditions, a novel method for the optimization of stope structure parameters is described. The method is based on the field investigation, laboratory tests and numerical simulation. The grey relational analysis (GRA) is applied to the optimization of the stope structure parameters in broken rock conditions with multiple performance characteristics. The influencing factors include stope height, pillar diameter, pillar spacing and pillar array pitch, the performance characteristics include maximum tensile strength, maximum compressive strength and ore recovery rate. The setting of influencing factors is accomplished using the four factors four levels Taguchi experiment design method, and 16 experiments are done by numerical simulation. Analysis of the grey relational grade indicates the first effect value of 0.219 is the pillar array pitch. In addition, the optimal stope structure parameters are as follows: the height of the stope is 3.5 m, the pillar diameter is 3.5 m, the pillar spacing is 3 m and the pillar array pitch is 5 m. In-situ measurement shows that all of the pillars can basically remain stable, ore recovery rate can be ensured to be more than 82%. This study indicates that the GRA method can efficiently applied to the optimization of stope structure parameters.
W pracy zaproponowano nową metodę optymalizacji parametrów struktury przodka wybierkowego prowadzonego w warunkach pękania skał. Metoda opiera się na badaniach terenowych, wykorzystuje także badania laboratoryjne oraz symulacje numeryczne. Do optymalizacji parametrów struktury przodka wybierkowego prowadzonego w warunkach pękania skał dla wielu wariantów charakterystyki górotworu wykorzystano ‘szarą’ analizę relacyjną (GRA – Grey Relational Analysis). Uwzględnione czynniki wpływu to wysokość przodka, średnica filarów, rozstaw filarów, rozmieszczenie filarów oraz charakterystyki górotworu: maksymalna wytrzymałość na rozciąganie oraz ściskanie oraz uzysk rudy. Ustawienia czynników wpływu dokonano z wykorzystaniem czterech czynników i dla czterech poziomów wg metody Taguchi planowania eksperymentów; ponadto 16 eksperymentów wykonano z wykorzystaniem symulacji numerycznych. Wyniki ‘szarej’ analiza relacyjnej wskazują, że wartość efektywna dla pierwszego z czynników, czyli rozmieszczenia filarów, wyniosła 0.219. Ponadto, otrzymano następujące optymalne parametry przodka: wysokość przodka 3.5 m; średnica filarów 3.5 m, rozstęp pomiędzy filarami 3 m, rozciągłość filarów 5 m. Pomiary przeprowadzone in situ wykazały, że wszystkie filary zasadniczo powinny zachować stabilność, a uzysk rudy przekroczyć może 82%. Wyniki wskazują, że ‘szara’ analiza relacyjna może być z powodzeniem wykorzystywana do optymalizacji parametrów struktury przodka wybierkowego.
Źródło:
Archives of Mining Sciences; 2018, 63, 2; 269-282
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Breast Pain and Sports Bra Usage Reported by Chinese Women: Why Sports Bra Education Programs are Needed in China
Ból piersi i użytkowanie biustonosza sportowego: dlaczego programy edukacyjne o biustonoszu sportowym są potrzebne w Chinach
Autorzy:
Chen, Xiaona
Wang, Jianping
Wang, Yanzhen
Gho, Sheridan A.
Steele, Julie R.
Powiązania:
https://bibliotekanauki.pl/articles/233497.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
breast pain
sports bra usage
bra fit
bra size
education program
ból piersi
biustonosz sportowy
dopasowanie biustonosza
rozmiar biustonosza
program edukacyjny
Opis:
This study aimed to evaluate breast pain and sports bra usage reported by Chinese women and to analyse whether they were affected by age, education, occupation, income or breast size. Four hundred and four Chinese women completed a questionnaire to determine their breast pain and its frequency as well as sports bra usage. Although more than 60% of Chinese women experienced breast pain during exercise, only 40% of them had ever worn a sports bra. The high percentage of participants who experienced breast pain and low percentage of sports bra usage confirmed the need to educate Chinese women on sport bra fit, design and reasons for wearing sports bras. Age, bra size and income level should be considered when implementing these educational programs.
Celem badania była ocena bólu piersi i użytkowania biustonosza sportowego oraz analiza wyników ze względu na wiek, wykształcenie, zawód, dochód i rozmiar piersi użytkowniczek. Czterysta cztery chińskie kobiety wypełniły kwestionariusz w celu określenia bólu piersi i jego częstotliwości, a także użycia biustonosza sportowego. Chociaż ponad 60% chińskich kobiet doświadczyło bólu podczas ćwiczeń, tylko 40% z nich nosiło stanik sportowy. Wysoki odsetek uczestniczek, które doświadczyły bólu piersi i niskiego odsetka użycia biustonosza sportowego, potwierdziły potrzebę edukowania chińskich kobiet na temat sportowego dopasowania biustonosza, projektowania i powodów noszenia sportowych biustonoszy. Przy realizacji tych programów edukacyjnych należy wziąć pod uwagę wiek, rozmiar biustonosza i poziom dochodów użytkowniczek.
Źródło:
Fibres & Textiles in Eastern Europe; 2019, 4 (136); 17-22
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Pressure Far-Infrared Magnetooptical Studies of Sn and S Donors in GaAs
Autorzy:
Dmochowski, J. E.
Wang, P. D.
Stradling, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/1888152.pdf
Data publikacji:
1991-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
78.50.Ge
Opis:
The diamond anvil cell technique is applied for magneto-optical far-infrared transmission experiments with LPE grown GaAs:Sn. The 1s-2p(+) intra-shallow-Γ-donor transition is investigated as a function of high hydrostatic pressure for Sn and residual S donors. Both donors are shallow up to 30 kbar. Above this pressure both donors become deep and shallow donor absorption is persistently bleached due to deep non-metastable (non DX-like) states of the donors entering the gap of GaAs.
Źródło:
Acta Physica Polonica A; 1991, 80, 2; 279-282
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of phosphorus recovery by struvite crystallization from animal manure wastewater in China
Autorzy:
Fang, C.
Zhang, T.
Czechowska-Kosacka, A.
Pawlowski, A.
Łagód, G.
Jiang, R.
Wang, Q.
Powiązania:
https://bibliotekanauki.pl/articles/207381.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
animal manure wastewater
phosphorus recovery
struvite
płynne odchody zwierzęce
odzysk fosforu
struwit
Opis:
Intensive farming is main industry which produces large amount of animal manure wastewater with high content of phosphorus. Its discharging to surface water leads to eutrophication. On the other hand, phosphorus is vital for plant growth and its natural reserves are rapidly exhausted. Therefore, recovering phosphorus from animal manure wastewater can achieve two important goals: prevention of eutrophication and recovery of non-renewable phosphorus compounds. The method of struvite precipitation has been presented for phosphorus recovery from animal manure wastewater. Based on scenario study, 8.76 million tons of struvite could be produced from animal manure wastewater in China.
Źródło:
Environment Protection Engineering; 2015, 41, 4; 195-207
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anderson Localization in Quantum Chaos: Scaling and Universality
Autorzy:
García-García, A. M.
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/2047824.pdf
Data publikacji:
2007-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Rn
71.30.+h
05.45.Df
05.40.-a
Opis:
The one-parameter scaling theory is a powerful tool to investigate Anderson localization effects in disordered systems. In this paper we show that this theory can be adapted to the context of quantum chaos provided that the classical phase space is homogeneous, not mixed. The localization problem in this case is defined in momentum, not in real space. We then employ the one-parameter scaling theory to: (a) propose a precise characterization of the type of classical dynamics related to the Wigner-Dyson and Poisson statistics which also predicts in which situations Anderson localization corrections invalidate the relation between classical chaos and random matrix theory encoded in the Bohigas-Giannoni-Schmit conjecture, (b) to identify the universality class associated with the metal-insulator transition in quantum chaos. In low dimensions it is characterized by classical superdiffusion, in higher dimensions it has in general a quantum origin as in the case of disordered systems. We illustrate these two cases by studying 1d kicked rotors with non-analytical potentials and a 3d kicked rotor with a smooth potential.
Źródło:
Acta Physica Polonica A; 2007, 112, 4; 635-653
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observations of plants with tubular stems with possible biomimetic implications
Autorzy:
Goto, M.
Wang, A.
Goto, H.
Powiązania:
https://bibliotekanauki.pl/articles/11698.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Two plants having tubular stems were examined. Water lily belongs to nymphaeaceae, while butterbur belongs to asteraceae. These plants are not relatives; however both have large leaves with lacinia. Furthermore, these plants have tubular long stems. Observations of leaf surface are described. Water lily leaf has an inside layer consisting of a network polygonal structure. The leaf has three layers at the microscopic level including small transparent skin tissue, and a middle layer showing a polygonal green structure where photosynthesis can be performed. The bottom layer shows fine tubular tissues. Stomas are observed on the surface of the leaf, with transparent tissue on the top layer and the stem of the butterbur with honeycomb (polygonal) structures in the leaves and stems. Plants are of interest for technology because their remarkable functional structure may provide clues for applications in materials science. In this study, the fine structures of the two plants were observed to learn their functional structure.
Źródło:
International Letters of Natural Sciences; 2015, 43
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metallurgical Characterization of Hot Tearing Curves Recorded during Solidification of Magnesium Alloys
Autorzy:
Huang, Y.
Wang, Z.
Srinivasan, A.
Kainer, K.
Hort, N.
Powiązania:
https://bibliotekanauki.pl/articles/1418495.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.D-
62.20.mt
61.25.Mv
61.66.Dk
61.72.Mm
Opis:
This work investigates the hot tearing behavior of Mg-Al and Mg-Zn alloys quantitatively based on the measurement of contraction force using an experimental setup which was developed at MagIC. An emphasis is given on the analysis of typical hot tearing curves to understand the corresponding metallurgical phenomena shown by these curves. The recorded hot tearing curves, i.e. the contraction force vs. temperature or time, contain valuable metallurgical information. They give not only the precise temperature at which the hot tearing initiates, but also depict information about the propagation of hot cracks. Combined with thermodynamic calculations, the critical solid fraction corresponding to the occurrence of hot tearing can be calculated. Further microstructural observations were performed. Several phenomena such as the crack propagation and refilling of cracks, which influence the slope of hot tearing curves, are also discussed.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 497-500
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation and characterization of rat gastric microvascular endothelial cells as a model for studying gastric angiogenesis in vitro
Autorzy:
Jones, M.K.
Wang, H.
Tomikawa, M.
Szabo, I.L.
Kawanaka, H.
Sarfeh, I.J.
Tarnawski, A.S.
Powiązania:
https://bibliotekanauki.pl/articles/71014.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
capillary microvessel
gastric endothelial cell
T lymphocyte
endothelial cell
monoclonal antibody
monocyte
angiogenesis
microvasculature
stomach
in vitro
rat
platelet
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 4,2
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Easy Vortex Motion in an Artificial Channel of $YBa_2Cu_3O_{7-δ}$ Superconducting Films
Autorzy:
Jukna, A.
Barboy, I.
Jung, G.
Abrutis, A.
Li, X.
Wang, D.
Sobolewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813381.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Sv
74.25.Qt
74.78.Bz
Opis:
Quasi-Josephson effect produced by a coherent vortex motion in the horizontal part of the laser-performedΠ-shaped channel of a $YBa_2Cu_3O_{7-δ}$ superconducting bridge was investigated by means of electric transport measurements. We observed that in our structures, in a limited range of temperatures and bias currents, the vortices were confined in the channel only and moved coherently with the velocity of $3×10^4$ m/s. The corresponding current-voltage characteristics of the bridge exhibited Josephson-like voltage steps with the amplitude dependent on temperature, but independent of the bias current.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 959-962
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of flood event in a reach of the Nile River using CCHE2D model
Autorzy:
Khan, A. A.
Wang, S. S. Y.
Powiązania:
https://bibliotekanauki.pl/articles/240958.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
river flow simulation
flood stage
stage-discharge relationship
Opis:
The impact of design flood in terms of water surface level and maximum velocity in a reach on the Nile River is studied, using a depth-averaged two-dimensional model. The reach includes a proposed site for a shipyard maintenance harbour. The CCHE2D model, a depth-averaged two-dimensional model, is selected to perform both the steady state computation, for calibration purposes, and flood routing through the reach to obtain maximum water surface level and velocity information. Manning's coefficient was obtained by matching the computed and measured water surface level in the reach under steady flow conditions. The computed results of velocity and water surface profiles agreed satisfactorily with the measured data. The verified model was then used to simulate a flood event within the same reach. Stage-discharge relationships for various sections within the reach were obtained. The peak water surface level at each section was compared with the flow stage under normal flow conditions. The peak stage was found to be well below the proposed elevation of the construction site. The estimation of the peak velocity and water surface level might be useful for bank protection work.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 4; 329-341
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvent-free synthesis of 1-amidoalkyl-2-naphthol and 3-amino-1-phenyl-1H benzo[f]chromene-2-carbonitrile derivatives by Fe3O4@enamine-B(OSO3H)2 as an efficient and novel heterogeneous magnetic nanostructure catalyst
Autorzy:
Li, Fangping
Zhang, Jun
Wang, Longjiang
Liu, Weijian
Yousif, Qahtan A.
Powiązania:
https://bibliotekanauki.pl/articles/778863.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
1-amidoalkyl-2-naphthol
3-amino-1-phenyl-1H benzo[f]chromene-2-carbonitrile
solvent-free conditions
magnetic
catalyst
Opis:
A green procedure for the one-pot three-component synthesis of 1-amidoalkyl-2-naphthol and 3-amino-1-phenyl-1H benzo[f]chromene-2-carbonitrile derivatives from the reaction of 2-naphtol, aldehydes, and malononitrile/acetamide in the presence of a catalytic amount of Fe3O4@enamine-B(OSO3H)2 as an efficient and novel heterogeneous magnetic nanostructure catalyst is described. The catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). These strategies possess some merits such as simple work-up method, easy preparation of the catalyst, short reaction times, good-to-high yields, and non-use of hazardous solvents during all steps of the reactions. Moreover, due to the magnetic nature of the catalyst, it was readily recovered by magnetic decantation and can be recycled at least six runs with no considerable decrease in catalytic activity.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 2; 9-19
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 47

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