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Wyświetlanie 1-14 z 14
Tytuł:
Did the COVID-19 pandemic permanently impact e-commerce in the US market?
Autorzy:
Genc, Ismail H.
Arzaghi, Mohammad
Powiązania:
https://bibliotekanauki.pl/articles/36102610.pdf
Data publikacji:
2024
Wydawca:
Fundacja Naukowa Instytut Współczesnych Finansów
Tematy:
Technological change
Habit formation
Learning by doing
Revolving ADF
COVID
Opis:
The pandemic compelled many individuals, initially hesitant about online shopping, to overcome their reservations, acquire essential skills, and transition to online retail. This provided a natural experiment to assess whether the barriers to online shopping and the comfort of traditional in-store habits have hindered a broader shift to e-commerce. This paper uses the US retail data to analyze e-commerce activities before, during, and after the pandemic to determine whether the pandemic has permanently altered the pattern of the activities to determine whether the pandemic has permanently altered the pattern of the activities by utilizing structural break detection tools. Additionally, we carry out a forecasting exercise for post-pandemic based on pre-pandemic data to confirm our findings. Results suggest that while e-commerce activities surged during lockdown, they have predominantly reverted to pre-pandemic patterns. Our findings caution both investors and companies against overreaction in the face of exuberant changes in the market to avoid painful corrections afterward.
Źródło:
Modern Finance; 2024, 2, 1; 18-30
2956-7742
Pojawia się w:
Modern Finance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fumigant toxicities of essential oils and two monoterpenes against potato tuber moth (Phthorimaea operculella Zeller)
Zastosowanie fumigacji za pomocą olejków eterycznych i dwóch monoterpenów do zwalczania skośnika ziemniaczaka (Phthorimaea operculella Zeller)
Autorzy:
Tayoub, G.
Alorfi, M.
Ismail, H.
Powiązania:
https://bibliotekanauki.pl/articles/72283.pdf
Data publikacji:
2016
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Opis:
Introduction: The potato tuber moth (PTM) is the major economic pest of potato. Different approaches were tried to prevent and control this pest including natural pesticides and synthetic fumigants. Objectives: This study was conducted to evaluate the insecticidal activity of the essential oils of thyme and myrtle. In addition to evaluating the insecticidal activity of carvacrol and eucalyptol against the different life stages of potato tuber moth using a fumigation bioassays. Methods: Thyme and myrtle oils were extracted from wild Thymus syriacus Boiss. and wild Myrtus communis L. by hydrodistillation. Fumigation experiments were conducted on potato tuber moth of different stages of development (eggs, larvae, pupae, and adults), using standard methods. The potato tuber moth was treated for different periods using different concentrations of the essential oils. One-way analysis of variance (ANOVA) was applied on the mortality percentages data to estimate the significance of differences between treatments at p<0.05. Probit analysis was used to estimate the LC50, LC90 and LT50. Results: Adult stage was the most sensitive to essential oils vapours with LC50 value of 0.5 μl/l air. Whereas, pupal stages were the most tolerant. The essential oil of thyme possessed the strongest fumigant toxicity against eggs with a LC50 value of 6.1 μl/l air. The two monoterpens showed varied fumigant toxicity against adult stage. Carvacrol achieved 100% mortality at 0.125 μl/l air after 6 h, and 0.025 μl/l air after 48h exposure with LT50 period of 0.5 h. Conclusion: The present work demonstrated that T. syriacus essential oil is a promising natural fumigant against the different developmental stages of PTM.
Wstęp: Skośnik ziemniaczak (PTM) jest szkodnikiem powodującym największe szkody w zbiorach ziemniaka. Podejmowano różne próby zapobieżenia i kontrolowania tego szkodnika za pomocą naturalnych pestycydów i syntetycznych fumigantów. Cele: Przedstawione badania miały na celu określenie aktywności owadobójczej olejków eterycznych z tymianku i mirtu. Dodatkowo stosując fumigację zbadano aktywność owadobójczą karwakrolu i eukaliptolu przeciwko skośnikowi ziemniaczakowi w różnych stadiach jego rozwoju. Metody: Olejki z tymianku i mirtu wyekstrahowano z dzikorosnących osobników Thymus syriacus Boiss. i Myrtus communis L. metodą hydrodestylacji. Doświadczenia z fumigacją prowadzono na różnych stadiach rozwojowych skośnika (jaja, larwy, poczwarki i okazy dorosłe) przy użyciu standardowych metod. Stosowano różne stężenia oraz czasy działania olejków eterycznych. Do określenia istotności statystycznej różnic w śmiertelności owadów (przy p<0.05) użyto jednoczynnikowej analizy wariancji (ANOVA). Do oznaczenia LC50, LC90 and LT50 wykorzystano analizę probitową. Wyniki: Osobniki dorosłe były najbardziej wrażliwe na opary olejków eterycznych – LC50 przy stężeniu 0,5 μl/l powietrza. Z kolei poczwarki tolerowały go najlepiej. Opary olejku eterycznego z tymianku najsilniej toksycznie działały na jaja – LC50 przy stężeniu 6,1 μl/l powietrza. Dwa monoterpeny wykazały różnorakie działanie toksyczne na osobniki dorosłe. Karwakrol powodował 100% śmiertelność przy stężeniu 0,125 μl/l powietrza po 6 h i dla stężenia 0,025 μl/l powietrza po 48 h ekspozycji, przy okresie LT50 wynoszącym 0,5 h. Wniosek: W pracy wykazano, że olejek eteryczny z T. syriacus jest obiecującym naturalnym fumigantem działającym przeciwko PTM w różnych stadiach rozwojowych.
Źródło:
Herba Polonica; 2016, 62, 4
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro micropropagation of Acacia auriculiformis from selected juvenile sources
Autorzy:
Ismail, H.
Kumar, S.M.
Aziah, M.Y.
Hasnida, N.H.
Nor Aini, A.S.
Powiązania:
https://bibliotekanauki.pl/articles/41196.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
in vitro
micropropagation
Acacia auriculiformis
juvenile source
Opis:
The effects of 6- Benzylaminopurine (BA), different basal medium, sucrose concentration and gelling agent were investigated for shoot induction and multiplication of Acacia auriculiformis. Nodal explants derived from 5-month-old seedlings yielded the highest shoot multiplication rate in Murashige and Skoog medium (MS) with 0.44 μM BA, 30 g/L sucrose and 2 g/L Gelrite. The highest mean number of shoots (10) and mean length of shoots (5.07mm) were also obtained in this medium. Qualitative observation of the shoots cultured in 0.44 μM BA were greener and vigorous in growth as compared to shoots cultured on higher concentrations of BA (22.2 μM). MS medium produced a significantly higher number of shoots (18) compared to Woody Plant Medium (WPM) (11) and B5 medium (10). Media solidified with different gelling agents also produced a significantly different number of shoots with 2 g/L Gelrite produced the highest number of shoots (23). The highest percentage of shoots rooted was found in the MS medium without any growth regulators (40.0%) followed by medium supplemented with Indole-3-butyric acid (IBA) at 9.84 μM and the combination of 9.84 μM IBA with 5.37 μM α-naphthalene acetic acid (NAA) (33.3%). MS medium without any plant growth regulators produced the highest mean root length (84.33mm), whereas medium supplemented with 9.84 μM IBA produced the highest mean number of roots per shoot (4.33). Out planting of in vitro rooted shoots in shredded coconut husk as the substrate gave the highest percentage of survival (90%) during acclimatization in the greenhouse.
Źródło:
Dendrobiology; 2016, 75
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Delphi technique for generating criteria and indicators in monitoring ecotourism sustainability in Northern forests of Iran: Case study on Dohezar and Sehezar Watersheds
Autorzy:
Barzekar, G.
Aziz, A.
Mariapan, M.
Ismail, M.H.
Hosseni, S.M.
Powiązania:
https://bibliotekanauki.pl/articles/38399.pdf
Data publikacji:
2011
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
Delphi method
ecological indicator
monitoring
ecotourism
sustainability
forest
Iran
watershed
Opis:
Ecotourism is widely accepted as the most effective type of sustainable development. For monitoring ecotourism sustainability in the Northern forest of Iran, a study was designed to help identifying criteria and indicators (C&I) with the principle goal to ensure the objectives of forest management, and at the same time – maintain processes in a sustainable manner. Indicators act as an instrument which can be used for monitoring sustainability. Hence indicators should be multidisciplinary, and cover all aspect of social, ecological, cultural, economic and institutional factors affecting sustainability of ecotourism. In this study, C&I were identified by using the Delphi approach through multidisciplinary panel team. Three rounds of meetings were held for discussions and dissemination of research to a panel of local experts. At the end of the second round we reached a consensus on 9 criteria and 61 indicators, which include 21 indicators related to ecological aspects, 8 to economic aspects, 21 to social aspects, 6 to cultural aspects and 5 to institutional aspects. The selected indicators would be applied by the Iranian Cultural, Heritage, Handicrafts and Tourism Organization for monitoring ecotourism sustainability in the Northern forest of Iran.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2011, 53, 2
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Embedded RFID and Wireless Mesh Sensor Network Materializing Automated Production Line Monitoring
Autorzy:
Zulkifli, C.
Hassan, H.
Ismail, W.
Semunab, S.
Powiązania:
https://bibliotekanauki.pl/articles/1402545.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.84.-x
07.57.-c
Opis:
In industrial manufacturing, wireless network can be used in supply chain, retail stock management, electronic security keys, and theft prevention. A proactive and cost effective solution advancement is needed in the industrial manufacturing to monitor and control output performance at a manufacturing plant. It is with this reason that the manufacturers require an efficient communication and real time feedback to maximize uptime and improve productivity. Consistent with the future market of new technologies deployment this invention proposes a new complete solution method and architecture of embedded active radio frequency identification with counter system through wireless mesh sensor network platform and smart data processing adopted through web-based monitoring system for industrial automation. The ability of the developed system to function in machine-to-machine wireless communication and the adoption of web-based monitoring and data centralization contributes improvement in reducing errors with human intervention. In this paper we discuss the framework approach of a smart web-based monitoring and data acquisition system on wireless mesh sensor network platform. The evaluations and measurements have been conducted in real world environments which are conducted at selected industrial production factory.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-86-B-89
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Xerophiles and other fungi associated with cereal baby foods locally produced in Uganda
Autorzy:
Ismail, M.A.
Taligoola, H.K.
Nakamya, R.
Powiązania:
https://bibliotekanauki.pl/articles/67513.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
fungi
cereal product
baby food zob.child food
child food
food product
production
Uganda
xerophilic fungi
mycobiota
spoilage
contamination
Opis:
Fifty samples from five baby food products mainly made of cereal flour(s) were analyzed. The moisture contents of these products were between 11.14% and 11.9%, a level below 14.0%, the recommended level for safe storage of cereal grains and their products. The mycological analysis was carried out using the dilution plate method and two isolation media (DG18 for isolation of xerophilic fungi and DRBC for fungi in general). A total of 80 species related to 37 genera in addition to some unidentified fungal and yeast species were recorded on both media from the five products. The products were contaminated abundantly by xerophilic fungi which were occurring in 88% of food samples and accounting for 18.1% of the total CFU as recorded on DG18. The highest contamination level by xerophiles was registered in Mwebaza rice porridge (a component of rice flour) and the lowest in Mukuza (a product of maize, soyabean and sorghum flours). 11 xerophilic species were recorded of which Aspergillus and Eurotium (4 species each) were the predominant giving rise to 9.1% and 8.9% of the total CFU, with A. wentii, A. candidus, E. cristatum and E. repens were the most contaminating species. Of the fungi recorded other than xerophiles, species of Aspergillus (particularly A. flavus followed by A. niger), Penicillium (P. citrinum, P. oxalicum), Fusarium (F. solani, F. tricinctum), Cladosporium (C. sphaerospermum) and yeasts were the most predominant. Contamination of such foods is a matter of health hazard as these foods are for babies. So, the use of fresh, well-dried and uncontaminated flours for production of such foods is recommended.
Źródło:
Acta Mycologica; 2012, 47, 1
0001-625X
2353-074X
Pojawia się w:
Acta Mycologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of annealing temperature on the optical properties of ZnO nanoparticles
Autorzy:
Ismail, R. A.
Habubi, N. F.
Abid, H. R.
Powiązania:
https://bibliotekanauki.pl/articles/412203.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
nanoparticles
ZnO film
optical properties
drop casting technique
Opis:
In this work, ZnO films were prepared by drop casting technique. The films were deposited on quartz substrates under different annealing time (15,30,45 and 60 min.) at a constant temperature (800 °C). The optical properties were achieved by measuring the absorbance and transmittance spectra in the wavelength range (200-900) nm. It was found that the absorbance decreases while transmission increases as the annealing time increases, while the reflectance decreases as the annealing time increases. The optical measurements indicate the kind of transition which was a direct allowed with an average band gap energies lie between 3.3 eV and 3.54 eV with the change of annealing time.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 4; 37-47
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Responses of grofth of ladys fingers (Abelmoschus esculentus L.) to different treatments methods of dairy wastewater
Autorzy:
Al-Dulaimi, R.I.
Ismail, N.
Ibrahim, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/51987.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and characterization of porous silicon layer prepared by photo-electrochemical etching in CH3OH:HF solution
Autorzy:
Hadi, H.A.
Ismail, R.A.
Habubi, N.F.
Powiązania:
https://bibliotekanauki.pl/articles/412262.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
porous silicon
photo-electrochemical etching (PECE)
porosity
thickness
XRD
AFM
Opis:
Porous silicon (PS) has been fabricated by Photo-electrochemical etching. Porous silicon was anodized on n-type Si in light using a current density of 20mA/cm2 for 10 min. The porous structure formation was confirmed using XRD and AFM studies. The root mean square (RMS) roughness of the Porous silicon layer is found to be around 47.5 nm and the ten point height was 317 nm. The average of pores diameter was 419.98nm, and the grain growth is columnar with a (211) preferred orientation. The grain size of the PS was estimated from the Scherer's formula and found to be 73 nm. All the properties of the porous silicon layer, such as porosity and the thickness depend on the anodization parameters. The porosity (P) was approximately 77 %. The thickness of the layer formed during an anodization in constant current was 3.54nm in gravimetric method, while its value was 1.77nm by using the theoretical relation.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 3; 29-36
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acaricidal, ovicidal, and repellent effects of Tagetes patula leaf extract against Tetranychus urticae Koch (Acari: Tetranychidae)
Autorzy:
Ismail, M.S.M.
Tag, H.M.
Rizk, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/65234.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
This study investigates the acaricidal, ovicidal, and repellent effects of the Tagetes patula Linn. (Asteraceae) leaf extract against both the adult female and egg stages of Tetranychus urticae Koch (Trombidiformes: Tetranychidae) under laboratory conditions. The Tagetes patula ethanolic leaf extract [TpEtOH70%] was screened for adulticide and ovicide bioassays in order to consider its acute toxicity. One sublethal concentration was used to assess egg-laying capacity (fecundity), repellent, and oviposition deterrent activities. The chemical characterization was conducted by gas chromatography-mass spectrometry (GC-MS) analysis to identify the TpEtOH70% bioactive components. Results showed that the LC50 value of TpEtOH70% leaf extract predicted by Probit analysis against T. urticae adult females at 24 h was 0.99%.The TpEtOH70% leaf extract showed a significant toxic effect as the highest mean mortality rates (± SE) of the treated adult females was 88.9 ± 3.7%. However, the TpEtOH70% leaf extract was insignificant in affecting the egg-laying capacity of the adult females treated with a sublethal dose of 0.5% even after 72 h. The TpEtOH70% leaf extract was classified repellent since the repellent index (RI) value was lower than 1 – SD. In addition, it had a high oviposition deterring effect based on a 100% reduction of the total number of eggs. The TpEtOH70% leaf extract had a significant ovicidal effect on T. urticae eggs, with 56.04% reduction in hatching. Five bioactive compounds from various classes of phytochemicals were identified in the TpEtOH70% leaf extract and the major compound was phytol (62.72%). This pioneering investigation reveals the adulticidal, ovicidal, and repellent activities of the TpEtOH70% leaf extract against T. urticae. A combination of multiple modes of action of different plant components may act alone or in synergism to delay the development of mite resistance.
Źródło:
Journal of Plant Protection Research; 2019, 59, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green Driver: driving behaviors revisited on safety
Autorzy:
Muslim, N. H. B.
Shafaghat, A.
Keyvanfar, A.
Ismail, M.
Powiązania:
https://bibliotekanauki.pl/articles/223891.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
travel behavior
safe driving
reckless driving
driving skills and practice
green driver
index assessment model
zachowania w czasie jazdy
bezpieczna jazda
jazda lekkomyślna
umiejętności i praktyka
młody kierowca
Opis:
Interactions between road users, motor vehicles, and environment affect to driver’s travel behavior; however, frailer of proper interaction may lead to ever-increasing road crashes, injuries and fatalities. The current study has generated the green driver concept to evaluate the incorporation of green driver to negative outcomes reduction of road transportation. The study aimed to identify the green driver’s behaviors affecting safe traveling by engaging two research phases. Phase one was to identify the safe driving behaviors using Systematic literature review and Content Analysis methods. Phase one identified twenty-four (24) sub-factors under reckless driving behaviors cluster, and nineteen (19) sub-factors under safe driving practice cluster. Second phase was to establish the actual weight value of the sub-factors using Grounded Group Decision Making (GGDM) and Value Assignment (VA) methods, in order to determine the value impact of each sub-factor to green driving. Phase two resulted that sub-factors Exceeding speed limits (DB f2.2.) and Driver’s cognitive and motor skills (SD f1.2.2.) have received highest actual values, 0.64 and 0.49, respectively; ranked as the High contributor grade. Contrary, the sub-factors Age cognitive decline (DB f1.2.) and Competitive attitude (DB f1.2.), and Avoid gear snatching (SD f1.1.4.) have the lowest actual values; and ranked in low-contribution grade. The rest of the sub-factors have ranked in medium-contribution grade. The research also found out drivers’ personalities (included, physical and psychological characteristics) remains unaccountable and non-measureable yet in driver travel behavior assessment models. The study outputs would be used in development of Green Driver Index Assessment Model.
Źródło:
Archives of Transport; 2018, 47, 3; 49-78
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dinoflagellate cysts, palynofacies and organic geochemistry of the Cretaceous-Palaeogene (K–Pg) boundary transition at the Ellès section, northeastern Tunisia
Autorzy:
M’Hamdi, A.
Slimani, H.
Ismail-Lattrache, K. B.
Ali, W. B.
Powiązania:
https://bibliotekanauki.pl/articles/191365.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Cretaceous-Paleogene (K-Pg) boundary
dinoflagellate cysts
palynofacies
organic matter
EllÀs section
Tunisia
Opis:
A palynofacies study carried out across the Cretaceous–Palaeogene (K–Pg) boundary in the El Haria Formation at Ellès, northeastern Tunisia, revealed the presence of organic matter dominated by marine palynomorphs, mainly dinoflagellate cyst assemblages. Continental palynomorphs (sporomorphs) and amorphous organic matter (AOM) are also present in all samples. The total organic carbon (TOC) content is generally less than 0.7 wt.%. The Rock-Eval S1 parameters vary from 0.01 to 0.3 mgHC/g rock. The Rock-Eval S2 parameters vary from 0.15 to 0.57 mgHC/g rock. The hydrogen index (HI) and oxygen index (OI) values range from 61 to 214 mgHC/g TOC and 149 to 638 mgHC/g TOC, respectively. The Tmax values range from 420 to 440°C. The TOC, Rock-Eval pyrolysis and palynofacies analyses indicate that the El Haria Formation is characterized by immature organic matter type II and III and a low thermal alteration index (TAI). Also, the authors present in this paper the biostratigraphic, palaeoenvironmentl and palaeobiogeographic framework for the dinoflagellate cyst assemblages below and above the Cretaceous–Palaeogene boundary in the Ellès section.
Źródło:
Annales Societatis Geologorum Poloniae; 2014, 84, 3; 185-212
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Groundwater quality and hydrogeological characteristics of Malacca state in Malaysia
Jakość wód gruntowych i charakterystyka hydrogeologiczna stanu Malakka w Malezji
Autorzy:
Shirazi, S. M.
Adham, M. I.
Zardari, N. H.
Ismail, Z.
Imran, H. M.
Mangrio, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/947218.pdf
Data publikacji:
2015
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
aquifer productivity
groundwater
Malacca catchment
pumping test
water quality
jakość wody
pompowanie badawcze
woda gruntowa
wydajność warstwy wodonośnej
zlewnia Malakka
Opis:
Groundwater quality and aquifer productivity of Malacca catchment in Peninsular Malaysia are presented in this article. Pumping test data were collected from 210 shallow and 17 deep boreholes to get well inventory information. Data analysis confirmed that the aquifers consisting of schist, sand, limestone and volcanic rocks were the most productive aquifers for groundwater in Malacca state. GIS-based aquifer productivity map was generated based on bedrock and discharge capacity of the aquifers. Aquifer productivity map is classified into three classes, namely high, moderate and low based on discharge capacity. Groundwater potential of the study area is 35, 57 and 8% of low, moderate and high class respectively. Fifty two shallow and 14 deep aquifer groundwater samples were analyzed for water quality. In some cases, groundwater quality analysis indicated that the turbidity, total dissolved solids, iron, chloride and cadmium concentrations exceeded the limit of drinking water quality standards.
W artykule przedstawiono jakość wód gruntowych i wydajność warstwy wodonośnej w zlewni Malakka na Półwyspie Malajskim. Do badań zastosowano metodę pompowania badawczego z 210 płytkich i 17 głębokich odwiertów. Najbardziej wydajne okazały się poziomy wodonośne usytuowane w łupkach, piaskowcach, wapieniach i skale wulkanicznej. Na podstawie danych o podłożu i wydajności sporządzono mapę wydajności warstw wodonośnych. Wyróżniono trzy klasy wydajności warstw wodonośnych: wysoka (8%) badanego obszaru, umiarkowana (57%) i niska (35%). Analizom poddano 52 próbki z płytkich warstw i 14 próbek z głębokich warstw. W niektórych przypadkach stężenie zawiesiny, suchej masy, żelaza, chlorków i kadmu przekraczało dopuszczalne wartości dla wody pitnej.
Źródło:
Journal of Water and Land Development; 2015, 24; 11-19
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ground Penetrating Radar’s (GPR) Imaging and Applications to Pavement Structural Assessment: a Case of Malaysia
Autorzy:
Muslim, N. H.
Mohamed, M. I.
Amin, Z. M.
Shafaghat, A.
Ismail, M.
Keyyanfar, A.
Powiązania:
https://bibliotekanauki.pl/articles/224097.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pavement
assessment pavements
geophysical tools
ground penetrating radar
GPR
REFLEX 2D software
nawierzchnia
ocena nawierzchni
narzędzia geofizyczne
georadar
oprogramowanie REFLEX 2D
REFLEX 2D
Opis:
Traditionally, pavement distress evaluations were carried out by visual observation. Traditional practice requires a person to walk along the stretch of the pavement to conduct distress survey, take photo and measure defects occurred at deteriorated surfaces. However, this approach is too subjective, generates inconsistencies of information, less reliable and time-consuming. Due to these shortcomings, the transportation practitioners in pavement maintenance seek for other alternative tools and techniques to arrest incapability of traditional practices. One of the tools available in the market is Ground Penetrating Radar (GPR). GPR is a geophysical tool known by ability to accommodate extensive data in pavement assessment, geotechnical investigation and structural assessment. The application of GPR is such new to most of road maintenance industry in Malaysia. Therefore, this study has been undertaken to evaluate the benefits of using GPR imaging and its application in assessing pavement structures in Malaysia. The GPR survey was conducted in Meranti street located at UTM (Universiti Teknologi Malaysia) campus, and then analyzed using REFLEX 2D simulation software. The finding shows there are three (3) types of information obtained from GPR survey included; identification of raw image and processed image, identification of pavement segments thickness, and identification of GPR response towards surface and subsurface conditions, which illustrated in radargram images. Furthermore, the GPR can perform at high speed and can save time. It is also beneficial for long-term investment due to ability to provide extensive information at a greater depth. The research indicates that interpretation of GPR’s radargram images consumes time due to the low resolution. Therefore, selection of GPR system is subject to level of accuracy and clarity of radar images needed in a project.
Źródło:
Archives of Transport; 2017, 42, 2; 39-51
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-14 z 14

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