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    Wyświetlanie 1-13 z 13
    Tytuł:
    Roof runoff water as source of pollution: a case study of some selected roofs in Orlu Metropolis, Imo State, Nigeria
    Autorzy:
    Chizoruo, I.F.
    Onyekachi, I.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/10837.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    Samples collected from different runoffs; AR, GMR, TR, ASR, and DR for aluminum roof, galvanized metal roof, thatch roof, asbestos roof and ambient rainfall respectively were analyzed for pH, conductivity, turbidity, TDS, TSS, NO3 -, PO4 3-, Cd, Cu, Fe, Zn and Pb. The result indicates that the mean concentration of the parameters analyzed ranged from 5.8± 0.39 –7.10±0.70, 22.25±11.70 -79.99± 3.40μScm-1, 1.47±0.43 - 46.53±1.60mg/l, 11.90±0.93 - 59.83±1.62NTU,15.53±0.70 - 204.53±5.08mg/l, 0.93±0.06 - 2.55±0.13 mg/l, 1.33±0.22 - 7.30±0.57mg/l respectively for pH, conductivity, TDS, turbidity, TSS, PO4 3- and NO3 -, and the levels of the heavy metals (in mg/l); Cd, Cu, Fe, Zn and Pb ranged from 0.0023±0.001– 0.0521±0.004, 0.052±0.01–0.2483±0.02, 0.0348±0.01–1.1120±0.07, 0.0161±0.01- 0.8093±0.02 and 0.0106±0.01- 0.0499±0.002 respectively. Ranking of the heavy metal in roof runoff is in the order; Fe>Zn>Cu>Cd>Pb. The result compared with WHO standard showed elevated level of the parameters analyzed with Cd and Pb exceeding the limit. Though the result of this study showed some variability which is an indication of the type of roofing material; air quality of the environment and industrial activity going on in the area. It could be deduced from the result that roof runoff may be a non point source of environmental pollution owning to the release of heavy metals and other pollutants into the environment, and increased concentration of some of the pollutants as reported by this study suggests that roof runoff water could impact negatively to the environment and if consumed without being treated may be injurious to human health.
    Źródło:
    International Letters of Natural Sciences; 2016, 50
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occurrence and plasmid profiles of multidrug-resistant Enterobacteriaceae isolated from hawked soymilk samples in the Polytechnic of Ibadan Community, Nigeria
    Autorzy:
    Fadahunsi, I.F.
    Babalola, D.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096396.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    occurrence
    plasmid profiles
    multidrug-resistant Enterobacteriaceae
    soymilk
    Ibadan Polytechnic
    Community
    Opis:
    This study was conducted to determine the occurrence, antibiotic susceptibility pattern, and plasmid profile of multidrug-resistant (MDR) Enterobacteriaceae isolated from soymilk hawked in the Ibadan Polytechnic Community, Nigeria. Bacterial isolation and identification were performed using a culture-dependent method and biochemical characterization, respectively, while antibiotic susceptibility was tested using the disk diffusion method. Plasmid analysis and curing were performed using standard procedures. The results revealed the following occurrence rate of bacterial species in soymilk samples collected from all axes (South, North, East, West, and Central) of Ibadan Polytechnic: Citrobacter spp., 64%; Klebsiella spp., 7%; Enterobacter spp., Escherichia coli, and Serratia spp., 6% each; Proteus spp., 5%; and Salmonella spp. and Shigella spp., 3% each. The highest heterotrophic bacterial count of 9.3 × 103 CFU/ml was recorded at Ibadan Polytechnic North and South, while the least count (3.2 × 107 CFU/ml) was recorded at Ibadan Polytechnic Central. The highest enteric bacterial count of 1.3 × 103 CFU/ml was recorded in soymilk samples from Ibadan Polytechnic Central, while the least count of 1.7 × 107 CFU/ml was recorded in soymilk samples from Ibadan Polytechnic North. A total of 26% of the isolates showed resistance to cefpodoxime, while 88% of the isolates were susceptible to trimethoprim-sulfamethoxazole. Four of the MDR isolates possessed plasmid bands ranging from 6 to 1 with molecular weights from 2.7 to 17.2 kbp. Enterobacteriaceae such as isolates O14 (Klebsiella spp.) and B10 (E. coli) retained their resistance to antibiotics even after removal of plasmids, while isolates S13 (Citrobacter spp.) and O4 (Shigella spp.) were susceptible to some antibiotics after curing. Conclusively, soymilk sold in the sampled areas was highly contaminated with Enterobacteriaceae, thereby indicating poor hygiene standards of soymilk production.
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 2; 209-223
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of recent and chalcolithic period environmental pollution using Mytilus galloprovincialis Lamarck, 1819 from Yarimburgaz Cave, the Northern Marmara Sea and Bosphorus coasts
    Autorzy:
    Barut, I.F.
    Meric, E.
    Yokes, M.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/47682.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    geochemistry
    Mytilus galloprovincialis
    shell
    monitoring
    metal pollution
    environment pollution
    Yarimburgaz Cave
    Marmara Sea
    Bosphorus coast
    Źródło:
    Oceanologia; 2016, 58, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of different forest types in carbon storage depends on their internal structure
    Autorzy:
    Gheorghe, I.F.
    Biris, I.A.
    Valcu, C.-M.
    Powiązania:
    https://bibliotekanauki.pl/articles/57973.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    forest vegetation
    efficiency
    forest type
    carbon storage
    internal structure
    temperate forest
    productivity
    Opis:
    Forest vegetation is a key factor in the maintenance of global carbon cycle balance under the present climate change conditions. Forest ecosystems are both buffers against extreme climatic events accompanying climate change and carbon sinks diminishing the environmental impact of anthropogenic greenhouse gas emissions. We investigated the influence of stand structure and site characteristics on the productivity and carbon storage capacity of temperate forest types. Predictors of species productivity were parameters such as stand density, age, height, average diameter and wood density. Morus alba (L.) was more productive than average both in terms of annual volume increment and annual biomass gain, while Quercus sessiliflora (Matt.) Lieb. and Quercus frainetto (Ten.) were significantly less productive than average. Differences in stand productivity were explained by stand density, age, height, altitude, type of regeneration and species composition. Statistically significant differences were measured between the productivity of stands dominated by different woody species, with low productive stands dominated by slow growing species with high wood density like Quercus or Fagus, and highly productive stands rich in fast growing species with low wood density like Populus or Salix. Stands with different plant communities in the underlying herbaceous layer also tended to have different levels of productivity.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2010, 79, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationships between the De Martonne aridity index and water requirements of some representative crops: A case study from Romania
    Autorzy:
    Paltineanu, C.
    Tanasescu, N.
    Chitu, E.
    Mihailescu, I.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/26332.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    horticultural crop
    Romania
    water requirement
    evapotranspiration
    cereal
    water conservation
    irrigation
    Źródło:
    International Agrophysics; 2007, 21, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative evaluation of ballistic resistance of textile armor packages against steel and lead bullets
    Autorzy:
    Grigoryan, V.A.
    Kobylkin, I.F.
    Bespalov, I.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/237961.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Technologii Bezpieczeństwa Moratex
    Tematy:
    odporność balistyczna
    pancerz ze stali
    pancerz z ołowiu
    ballistic resistance
    stainless steel armor
    breastplate of lead
    Opis:
    The paper contains physical models of high-speed interaction of non-deformable and deformable impactors with textile armor. The effect of the impactor deformability and of the method of the armor pack fixation on its ballistic characteristics is analyzed. Computational echniques are described for evaluation of textile armor ballistic resistance against steel- and leadcore bullets; quantitative dependences for valuation of different grades of Russian armor textiles for different ways of fixation are presented.
    Źródło:
    Techniczne Wyroby Włókiennicze; 2009, R. 17, nr 2/3, 2/3; 58-63
    1230-7491
    Pojawia się w:
    Techniczne Wyroby Włókiennicze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties and microstructure of alkali activated mortar containing unexpanded clay
    Autorzy:
    Nasser, I.F.
    Ali, M.A.
    Kadhim, M.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201132.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    alkali-activated mortar
    pozzolan
    unexpanded clay
    flexural toughness
    scanning electron microscope
    thermal insulation
    pucolana
    glina nie spulchniona
    wytrzymałość na zginanie
    skaningowy mikroskop elektronowy
    izolacja termiczna
    Opis:
    Purpose: In building constructions, due to the decrease of local raw materials and for sustainability purpose, beside the need of light pieces to be used in roofing and false ceiling; an alkali-activated mortar is the new development where pozzolanic material is used instead of cement and activated by an alkaline solution. Therefore, in this research, alkali-activated mortar containing unexpanded clay as a fine aggregate with a dry density of 1652 kg/m3, compressive strength of 3.2 MPa, and thermal conductivity of 0.4 (W/m.K) was produced ,also boards were performed in a dimension of 305×152×12 mm as to use them in false ceiling, and reinforced with 0.25 and 0.5% steel fibre to improve their toughness by 370.8% and 1146.1% compared with reference boards, which made them good choice to used them in roofing and secondary ceiling. Design/methodology/approach: For preparation of alkali-activated mortar, low calcium fly ash (FA) was used as a source binder material. In addition, super-plasticizer and unexpanded clay as a fine aggregate (produce from the crushed artificial aggregate) in the ratio of 1:2.75 fly ash/fine aggregate. The paste was prepared by mixing fly ash with an alkali silicate solution, in a solid-to-liquid ratio of 0.4. Alkali silicate activator was prepared by mixing the NaOH and Na2SiO3 solutions at the mass ratios of 2.5. The concentrations of the NaOH was the same molarity of (14M).To improve the mechanical properties of the reference mortar mixture ,steel fibre with 0.25 and 0.5% content were added to the mix .The specimens were tested for water absorption, dry density, compressive strength, flexural strengths, flexural toughness, and thermal conductivity, in addition to the Scanning Electron Microscope test (SEM) for all mortar mixes. Alkali-activated mortar boards with (305×152×12 mm) were prepared and tested for flexural strength and toughness. Findings: The results indicated that the modulus of rupture for mortar boards reinforced with 0.25 and 0.5% steel fibre exhibits an increase of (3.68-12.10)%. In comparison, the toughness is increased by about 370.8% and 1146.1%, respectively, as compared with the reference mortar (without fibre) which made them resistance to accident, in addition to use them in roofing due to their thermal insulation. Research limitations/implications: Further research is needed to make a similar board using another sustainable material. We can examine the thermal insulation that we can get from these board, especially in the building in Iraq which the weather faces high temperatures. Practical implications: There is a by-product that we could get from the electricity station in Iraq. We must study how we get rid of it. Originality/value: This paper investigate how to produce a new light board using artificial aggregate made from unexpanded clay, which has many benefits in building insulation roofing.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 113, 2; 56--68
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gene expression of heat shoc kproteins/factors (HSP60, HSP70, HSP90, HSF-1, HSF-3) and antioxidant enzyme activities in heat stressed broilers treated with vitamin C
    Autorzy:
    Albokhadaim, I.F.
    Althnaian, T.A.
    El-Bahr, S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087482.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ascorbic acid
    tissues
    chicken
    peroxidatio
    biomarkers
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 565-572
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation between sunshine duration and global solar radiation in South-Eastern Romania
    Autorzy:
    Paltineanu, C.
    Mihailescu, I.F.
    Torica, V.
    Albu, A.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/24665.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    global solar radiation
    Romania
    air temperature
    air humidity
    sunshine duration
    extra-terrestrial radiation
    Źródło:
    International Agrophysics; 2002, 16, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ballistic performance of textile armor treated with shear thickening fluid
    Autorzy:
    Grigoryan, V.A.
    Kobylkin, I.F.
    Marinin, V.M.
    Bespalov, I.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/237902.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Technologii Bezpieczeństwa Moratex
    Tematy:
    odporność balistyczna
    zbroja włókiennicza
    tkaniny impregnowane
    ballistic resistance
    textile armor
    impregnated textile
    Opis:
    In the systematized form a number of problems is discussed related to ballistic resistance of textile armor impregnated with shear thickening fluid (STF); as STF high-concentrated suspensions of sub-micron particles and nano-particles were used. Physical models of high-speed interaction of bullets and fragments with STF-impregnated textile armor are presented; where possible quantitative relationship and computational techniques for the "liquid armor" ballistic properties evaluation are described. Based on notions of different mechanisms of the impactor energy absorption by textile armor packs under high-speed and low-speed interaction the conclusion was made about the highest efficiency of STF-impregnated textile armor when used against such threats as spike and as a back layer of combined fragmentation-and bullet-resistant textile armor packages.
    Źródło:
    Techniczne Wyroby Włókiennicze; 2009, R. 17, nr 2/3, 2/3; 12-15
    1230-7491
    Pojawia się w:
    Techniczne Wyroby Włókiennicze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remediation of mild crude oil polluted fresh water wet land with organic and inorganic fertilizer
    Autorzy:
    Chizoruo, I.F.
    Onyekachi, I.B.
    Chinaka, I.C.B.
    Chinyelue, E.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/11451.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    Wetland pollution due to inputs from crude oil is one of the most prevalent environmental problems facing the aquatic ecosystem in the world. The present study was intended to investigate the effectiveness of combination of cow lumen and NPK fertilizer in stimulating the degradation of crude oil polluted fresh water wet land. Soil samples were collected from unpolluted plots, crude oil polluted plots and crude oil polluted plots that were treated with the remediating agents. After fifteen days and sixty days of remediation, the soil samples were analysed for pH, electrical conductivity (E.C), phosphate, PO3- 4, phosphorous, P, % organic carbon, % total nitrogen N, carbon/nitrogen ratio and total petroleum hydrocarbon, TPH. The result indicates that combination of the inorganic and organic manure was more efficient in stimulating the degradation of the crude oil than the use of either the cow lumen or NPK fertilizer alone. The physiochemical properties of the soil in all the treated plots were observed to have been improved when compared with that of the untreated plots.
    Źródło:
    International Letters of Natural Sciences; 2016, 54
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geospatial and geostatistical analyses of particulate matter (PM10) concentrations in Imo State, Nigeria
    Autorzy:
    Iheanyichukwu, O.A.
    Chizoruo, I.F.
    Chukwuemeka, N.P.
    Ikechukwu, A.J.
    Kenechukwu, E.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/11174.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    Geospatial and geostatistical analysis of particulate matter (PM10) variation in Imo State, Nigeria was carried out. The objectives of the study were to determine and analyze the variation in concentration of ambient PM10 level in Imo State, Nigeria. Air quality sampling was conducted within November 2014 and June 2015, in wet and dry seasons three times daily using Haze Dust Particulate Monitor (10μm). The mean concentration of PM10 level observed in the study varied from 5.22 - 6.63mg/m3 in wet season and 5.80 - 8.38 mg/m3 in dry season. Coefficient of variation (CV %) revealed that the variability of PM10 level ranged between little and moderate variations in both wet and dry season. Analysis of variance (ANOVA p<0.05) showed statistically significant variation in the mean PM10 level in the study locations. Box and Whisker plots confirmed variation of PM10 in the morning, afternoon and evening. The GIS plots revealed the spatial attributes of the air pollutant in the study locations. Time series plots indicate that the air pollutants fluctuated throughout the study duration. The Wind Rose suggests that the prevailing wind speed and wind directions were responsible for the dispersal migration of the air pollutant in the study area. The highest seasonal mean values were observed in Egbema and Okigwe area in both dry and wet season. The seasonal mean values recorded in the study exceeded the Nigerian National Ambient Air Quality Standards. This calls for urgent response to prevent further air quality deterioration and its negative effects on man and the environment.
    Źródło:
    International Letters of Natural Sciences; 2016, 57
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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