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Wyświetlanie 1-15 z 1547
Tytuł:
Synthesis, computational, anticancerous and antiproliferative effects of some copper, manganese and zinc complexes with ligands derived from symmetrical 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde
Autorzy:
Ababneh, Taher S.
El-Khateeb, Mohammad
Tanash, Aissar K.
AL-Shboul, Tareq M.A.
Shammout, Mohammad Jamal A.
Jazzazi, Taghreed M.A.
Alomari, Mohammad
Daoud, Safa
Talib, Wamidh H.
Powiązania:
https://bibliotekanauki.pl/articles/1849324.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
tetradentate schiff base
symmetrical metal complexes
DFT calculation
spectroscopy
anticancerous
antiproliferative
Opis:
Four new symmetrical Schiff bases derived from 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde have been synthesized and characterized by elemental analysis and different spectroscopic techniques. The reaction of 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl with two equivalents of 5-tert-butyl-, 3,5-dinitro-, 3,5-dibromo- and 3-tert-butyl-salicylaldehyde yielded 2,2’-bis(5-tert-butyl-salicylideneamino)-4,4’-dimethyl-1,1’-biphenyl (A1) as well as the 3,5-dinitro- (A2), 3,5-dibromo- (A3) and 3-tert-butyl- (A4) substituted derivatives. The tetradentate ligands were then reacted with copper-, manganese- and zinc-acetate producing the tetra-coordinate metal complexes which were characterized by FTIR, UV-Visible spectroscopy, magnetic susceptibility and elemental analysis. Zinc complexes were characterized by 1H-NMR spectroscopy. Density functional theory (DFT) calculations at the B3LYP/6-31G(d) level of theory were carried out to fully optimize and examine the molecular geometries of complexes. Subsequently, IR vibrational and UV-Vis absorption spectra were computed and correlated with the observed values and the results are in good agreement with the experimental data. The anticancerous and antiproliferative activity of the A3 ligand and its metal complexes were determined.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 1; 7-15
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crosslinked poly(hydroxybutyl acrylate-co-acrylamide) based hydrogels : synthesis, characterization, and performance evaluation in heavy metal removal
Hydrożele na bazie usieciowanego poli(akrylanu hydroksybutylo-co-akrylamidu) : synteza, charakterystyka i ocena zdolności do usuwania metali ciężkich
Autorzy:
Abdallah, Zahraa Saadi
Mohammed, Ameen Hadi
Powiązania:
https://bibliotekanauki.pl/articles/24202779.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
superabsorbent polymer
hydroxybutyl acrylate
acrylamide
adsorption properties
heavy metal ions removal
polimery superchłonne
akrylan hydroksybutylu
akryloamid
właściwości adsorpcyjne
usuwanie jonów metali ciężkich
Opis:
By radical polymerization, two series of superabsorbent hydrogels of hydroxybutyl acrylate and acrylamide copolymers, poly(HBA-co-AAm), were obtained. In the first series, the ratio of hydroxybutyl acrylate to acrylamide was optimized with a constant amount of methylene bisacrylamide (MBA) as a cross-linking agent. In the second series, the amount of MBA was changed at a fixed monomer ratio. The structure of the copolymers was confirmed by the FTIR method. Swelling parameters and mechanical properties were tested. Hydrogels with a high Young’s modulus and a high degree of swelling were selected for the study of adsorption properties towards Co2+, Ni2+ and Cd2+ ions. The influence of basic factors such as adsorbent dose, exposure time and pH on adsorption efficiency was also investigated. The ability to adsorb heavy metal ions changed as follows: Co2+> Ni2+> Cd2+.
Metodą polimeryzacji rodnikowej otrzymano dwie serie superchłonnych hydrożeli kopolimerów akrylanu hydroksybutylu i akryloamidu, poli(HBA-co-AAm), otrzymano. W pierwszej serii optymalizowano stosunek akrylanu hydroksybutylu do akryloamidu przy stałej ilości metylenobisakryloamidu (MBA) jako czynnika sieciującego. W drugiej serii przy ustalonym stosunku monomerów zmieniano ilość MBA. Strukturę kopolimerów potwierdzono metodą FTIR. Zbadano parametry pęcznienia oraz właściwości mechaniczne. Do badań właściwości adsorpcyjnych w stosunku do jonów Co2+, Ni2+ i Cd2+ wytypowano hydrożele o wysokim module Younga i wysokim stopniu pęcznienia. Zbadano również wpływ podstawowych czynników, takich jak dawka adsorbentu, czas ekspozycji i pH na efektywność adsorpcji. Zdolność do adsorpcji jonów metali ciężkich zmieniała się następująco: Co2+> Ni2+> Cd2+.
Źródło:
Polimery; 2023, 68, 2; 86--92
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploitation of industrial solid wastes for preparing zeolite as a value-added product and its kinetics as adsorbent for heavy metal ions
Autorzy:
Abdel-Hameed, Reham Mohamed
Abdel-Aal, Elsayed A.
Farghaly, Fatma E.
Ibrahim, Ibrahim A.
Abdel Khalek, Mohamed A.
Ahmed, Mohamed A.
Abdel-Messih, Micheal F.
Powiązania:
https://bibliotekanauki.pl/articles/1448799.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
zeolite P
aluminium wastes
hydrothermal process
metal ion removal
aluminum waste
Opis:
Aluminum and fumed silica as solid industrial wastes were converted to zeolite NaPas a value-addedproduct without any template. The hydrothermal process was optimized using static autoclave. The crystallization was carried out at 100, 120 and 150°C for 24, 48 and 72 h. The prepared zeolite of Si:Al ratio of 1.2 was characterized using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) provided with Energy Dispersive Spectroscopy (EDS), Surface Area, Fourier Transmitted Infra-Red (FTIR) and Thermal Analysis (TG-DSC). The crystalline phase was formed at 100°Cafter 72 hours and at 120°C after 48 hours, while it was formed after 24 honlyat 150°C. Increasing temperature and time lead to the conversion of the prismatic gibbsite crystals into plate-like structure of zeolitewhich is then formedcauliflower-like structure.The prepared zeolite was employed as adsorbent for $Ni^{2+}$ and $Cu2+ions from aqueous solution.The kinetic studies of adsorption processes were performed.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 1; 87-99
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Removal Performance of Bio-Sorption on Sunflower Seed Husk for Copper and Lead Ions from Aqueous Solutions
Autorzy:
Abdulhusain, Noor Alaa
Mokif, Layla Abdulkareem
Powiązania:
https://bibliotekanauki.pl/articles/24201773.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heavy metal
industrial wastewater
adsorption capacity
sunflower seed husk
Opis:
This study was concerned with the feasibility of using sunflower seed husk (waste material from the food industry) as a low-cost and available sorbent material to remove copper and lead ions. Sunflower seed husk was used for the biosorption of heavy metal ions (Pb(II) and Cu(II)) from aqueous solutions. The properties of natural adsorbent were characterized using Fourier transform infrared spectroscopy (FTIR). Pb(II) and Cu(II) adsorption were investigated in batch experiments through several influencing operating parameters, including contact time, sorbent dosage, initial pH, and initial concentration. The Pseudo-first-order and pseudo-second-order models were also applied to the experimental data to determine the adsorption kinetics. The results showed that adsorption of both ions fitted well by pseudo-Second-order, with determination coefficient R2 = 0.99, for both ions with SSE (1.628, 1.345) for Pb(II) and Cu(II), respectively.
Źródło:
Journal of Ecological Engineering; 2023, 24, 5; 110--117
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of materials used for coatings of electrical connectors used in the electrical harness of passengers cars
Autorzy:
Adamczyk, Paulina
Zięty, Anna
Grygier, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/24202427.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
automotive electrical connectors
metal coatings
anodic protection
cathodic protection
corrosion
samochodowe złącza elektryczne
powłoki metalowe
ochrona anodowa
ochrona katodowa
korozja
Opis:
Automotive electrical connectors are the essential components of a wiring harness. They are typically made of copper, which has excellent electrical conductivity. Due to the limited corrosion resistance of pure copper, connectors are often coated with other metals. In this paper, the qualities of coatings made of gold and tin are investigated and compared. The samples were examined by a metallographic microscope and scanning electron microscope (SEM). The examination revealed uneven thickness, delamination of the coatings, and issues with the preparation of the core material for coating. Numerous burrs and irregularities were observed. Selected samples were examined in salt solution to test their corrosion resistance. Even though gold is a noble metal and its electrochemical potential is higher, the tin coating was more resistant to corrosion.
Źródło:
Combustion Engines; 2023, 62, 1; 43--49
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości stopu Ti-6Al-4V po modyfikacji powierzchni
Properties of the biofunctionalized surface of Ti-6Al-4V alloy
Autorzy:
Adamek, G.
Jakubowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/283787.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
Ti6Al4V
odporność korozyjna
wytrzymałość połączenia metal-ceramika
biozgodność
Ti-6Al-4V
corrosion resistance
metallic/ceramic bond strength
biocompatibility
Opis:
W pracy badano właściwości porowatego stopu Ti-6Al-4V istotne z punktu widzenia zastosowań na implanty tkanek twardych. Stop wytworzono za pomocą procesu mechanicznej syntezy, prasowania i spiekania. Modyfikację powierzchni prowadzono dwuetapowo: pierwszym było elektrochemiczne trawienie w 1M H3PO4 + 2% HF w 10 V przez 30 min, a drugim osadzanie ceramiki fosforanowo wapniowej (Ca-P) z wodnego roztworu 0,042M Ca(NO3)2 + 0,025M (NH4)2HPO4 + 0,1M HCl. Jony wapnia i fosforanowe osadzają się w głębi porów, co polepsza wytrzymałość połączenia ceramicznej powłoki z metalicznym podłożem. Wytrzymałość była o ponad 50% większa dla porowatego stopu niż dla litego odpowiednika. Odporność korozyjną badano w roztworze Hanka symulującym środowisko płynów ustrojowych (SBF). Po osadzaniu powłoki Ca-P zaobserwowano niewielką poprawę gęstości prądu korozyjnego w stosunku do próbki polerownej. Zbadano również biozgodność stopu po modyfikacji powierzchni w testach in vitro. Powierzchnia po elektrochemicznej modyfikacji wykazuje dobrą biozgodność, a powłoka Ca-P wspomaga wzrost i proliferację osteoblastów. Ze względu na porowatość, stosunkowo dobrą wytrzymałość połączenia i biokompatybilność powierzchni stop Ti-6Al-4Vpo elektrochemicznej modyfikacji wydaje się być dobrym materiałem na implanty tkanek twardych.
Properties of a porous Ti-6Al-4V alloy, important in hard tissue implants applications, were investigated. The alloy was prepared by mechanical alloying followed by pressing, sintering and subsequent anodic electrochemical etching in 1M H3PO4 + 2% HF elec¬trolyte at 10 V for 30 min and bioactive ceramic Ca-P layer deposition, using a mixture of 0.042M Ca(NO3)2 + 0.025M (NH4)2HPO4 + 0.1M HCl dissolved in distilled water. The Ca2+ and PO43- ions penetrate the pores preferentially inside, which results in improved bonding of the bioceramic layer to the metallic substrate. The bond strength obtained by a tensile test shows more than 50% higher strength to the porous Ti-6Al-4V substrate than to the bulk material. The corrosion resistance of the alloys was investigated in Hank's Balanced Salt Solution (HBSS) which is simulated body fluid (SBF). We observed slight improvement in corrosion current density after etching and additional Ca-P deposition compared to mechanically polished samples. The biocompatibility of the Ti-6Al-4V alloy with a porous Ca-P layer was investigated. We showed that the rough, electrochemically biofunctionalized sur¬face supported osteoblast cell growth and proliferation. Due to rough morphology, relatively strong bonding to the metallic substrate and in vitro biocompatibility the electrochemically modified surface of the ultrafine grained Ti-6Al-4V is promising for hard tissue implant applications.
Źródło:
Engineering of Biomaterials; 2013, 16, 120; 35-40
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of forming thin titanium panels with stiffeners
Autorzy:
Adamus, J.
Winowiecka, J.
Dyner, M.
Powiązania:
https://bibliotekanauki.pl/articles/352785.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
commercially pure titanium
sheet
numerical simulation
sheet metal forming
Opis:
The growing demand for light and durable products has caused an increase in interest in products formed of thin sheets. In order to ensure sufficient stiffness of the drawn - parts, stiffening is often performed. Unfortunately, during the forming of stiffeners unwanted deformations of the drawn parts very often appear, which prevent them from further exploitation. In the paper, forming thin titanium panels with stiffeners is analysed. The panels are made of sheets of commercially pure titanium: Grades 2, 3 and 4. In the results of numerical analyses which were performed using PamStamp 2G, taking into consideration the impact of the blank holder force and friction conditions on the strain distribution in the drawn parts, sheet thinning and springback values are presented. The numerical analysis results were compared with the experimental tests. It was concluded that in order to prevent panel deformation being a result of residual stresses, it is necessary to ensure adequate friction conditions on the contact surfaces between the deformed material and tools as well as a suitable blank holder force.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 173-180
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of spring-back during forming of the element made of AMS 5604 steel
Analiza sprężynowania powrotnego podczas kształtowania elementu ze stali AMS 5604
Autorzy:
Adamus, J.
Lacki, P.
Łyźniak, J.
Zawadzki, M.
Powiązania:
https://bibliotekanauki.pl/articles/351332.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sprężynowanie
formowanie blachy
symulacja numeryczna
springback
sheet-metal forming
numerical simulation
AMS 5604 steel
Opis:
Spring-back poses a serious problem during the design of the sheet-metal forming processes due to difficulties in obtaining the correct shape and dimensional accuracy of the stamped elements. Forming with blank preheating is one of the methods of prevention against spring-back effect. However, this solution involves cost increase resulting from the additional operation of material heating and necessity of material protection against oxidation. In the paper forming of an element made of AMS 5604 steel, which is a part of aircraft engine deflector, has been analysed. The work aimed at determination of the spring-back effect arising during two-time forming on deviation of the basic size of the drawn-part from nominal one. Basing on the numerical analyses an optimum yield point for the deformed material, which assures maximum deviation from the basic size lower than 0.1 mm, has been also determined. Change in the yield point value was obtained thanks to heating up of the blank material before forming.
Zagadnienie sprężynowania powrotnego stanowi istotny problemem przy projektowaniu procesów kształtowania blach na zimno ze względu na trudności z otrzymaniem odpowiedniej dokładności kształtowo-wymiarowej elementów. Jednym ze sposobów eliminacji sprężynowania powrotnego jest kształtowanie z wstępnym podgrzewaniem materiału wyjściowego. Takie rozwiązanie wiąże się jednak z dodatkowymi kosztami wynikającymi z operacji nagrzewania materiału i konieczności jego zabezpieczania przed utlenianiem. W artykule analizowano kształtowanie elementu ze stali AMS 5604, stanowiącego fragment owiewki silnika lotniczego. Celem pracy było określenie wpływu skutków sprężynowania powrotnego powstającego podczas "dwukrotnego" tłoczenia na odchylenie wymiarów wytłoczki od wartości nominalnych Na podstawie analiz numerycznych określono również optymalną granicę plastyczności materiału zapewniającą otrzymanie maksymalnego odchylenia od wymiaru nominalnego mniejszego niż 0,1 mm. Zmianę wartości granicy plastyczności uzyskano poprzez podgrzanie blachy przed tłoczeniem do odpowiedniej temperatury.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 2; 422-430
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ warunków tarcia na rozkład odkształceń podczas tłoczenia wybranych elementów
Influence of frictional conditions on strain distribution in sheet-metal forming of some parts
Autorzy:
Adamus, J.
Dyja, K.
Więckowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/212025.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
Tematy:
blacha
tłoczenie
system tribologiczny
smar technologiczny
sheet
sheet-metal forming
tribological system
technological lubricant
Opis:
Procesy tłoczenia blach stanowią jedną z ważniejszych technologii kształtowania wyrobów cienkościennych. Rozpatrując proces tłoczenia jako system tribologiczny, szczególną uwagę należy zwrócić na smar technologiczny, który znacząco wpływa na jakość otrzymywanych elementów. W artykule omówiono wpływ smaru technologicznego na rozkład odkształceń w wytłoczkach. Przedstawiono wyniki badań współczynnika tarcia w próbie przeciągania pasa blachy oraz wyniki analiz numerycznych procesu tłoczenia blach.
Sheet-metal forming processes are one of the most important technologies used for forming sheet-metal parts. Considering sheet-metal forming process as a tribological system, particular attention should be paid to the technological lubricant, which significantly affects quality of the produced components. The article discusses an impact of the technological lubricant on a strain distribution in the drawn-parts. The friction coefficients which have been determined in the strip drawing test, as well as the results of numerical analyses of the sheet-metal forming process are given.
Źródło:
Obróbka Plastyczna Metali; 2014, 25, 4; 277-286
0867-2628
Pojawia się w:
Obróbka Plastyczna Metali
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of forming titanium thin-wall panels with stiffeners
Autorzy:
Adamus, Janina
Winowiecka, Julita
Dyner, Marcin
Lacki, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/102516.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sheet
commercially pure titanium
sheet-metal forming
stiffeners
numerical simulation
arkusz
komercyjnie czysty tytan
formowanie blachy
usztywniacze
symulacja numeryczna
Opis:
Due to the increase in the application of titanium components made of thin titanium sheets, in the work titanium panels made of 4 mm thick sheets are analysed. To increase the rigidity of the panels, some cross-shaped stiffeners were made. Such panels enable a reduction in weight while maintaining the existing strength of the drawn parts. Three kinds of commercially pure titanium are considered: Grade 1, 2 and 3. Numerical calculations were performed with PamStamp 2G based on the finite element method. The basic mechanical and technological properties of the analysed sheets, which are necessary for numerical modelling, were determined by static tensile testing. The friction coefficient was assumed based on the literature. On the basis of the performed numerical analyses, it was stated that the proper forming of panels with stiffeners depends not only on the drawability of the sheets but also on the technological parameters such as blank holder force and frictional conditions.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 1; 54-62
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Proximate Analysis of Five Commercially Sold Maggi as Condiments in Gwagwalada, North Central, Nigeria
Autorzy:
Adeeko, E. L.
Shittu, G. A.
Adeeko, T. O.
Umar, M.
Powiązania:
https://bibliotekanauki.pl/articles/1075587.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
bioaccumulation
bouillon
condiments
heavy metal
mineral elements
proximate
Opis:
Determination of the proximate, nutritionally valuable mineral in five samples of food seasonings label as, A, B, C, D, & E food condiments readily consumed in Nigeria were obtained from Gwagwalada Central Market Abuja. Investigating the concentrations of some mineral elements such as, iron (Fe), zinc (Zn), and two heavy metals, cadmium (Cd) and lead (Pb) were carried out using AA320N Atomic Absorption Spectrophotometer (AAS) after acid digestion with 2:1 HNO3/HClO4. The result shows that all samples contained high levels of protein (13.63% ±0.53%) with mean value moisture, ash, fat, fiber, and carbohydrate for all samples levels being (3.94%±0.64%), (57.51% ±4.27%), (5.11% ±0.20%), (0.02% ±0.00%) and (18.41% ±0.41%) respectively. Sample D has high Fe concentration with (0.04 ±0.01 μg/g) and Sample B & C has low Fe concentration with (0.01 ±0.00 μg/g). Sample D & E has high Zn concentration with (0.03 ±0.01 μg/g) and sample A, B & C has low Zn concentration with (0.02 ±0.01 μg/g). In cadmium, sample A has the high concentration (0.03±0.01μg/g), sample B & D has the low Cd concentration (0.02 ±0.00 μg/g). Sample D had the high Pb concentration (0.05 ±0.00 μg/g), sample C had the low Pb concentration (0.02±0.01 μg/g). In conclusion, Fe, Zn, Cd and Pb were both present in low concentrations in all the samples analyzed. The presence of Cd and Pb in the food seasonings even at low concentration could prove fatal through bioaccumulation. The low level of the toxic metals, Pb and Cd indicates that these products meet the safe limits specified by most food standards.
Źródło:
World Scientific News; 2019, 122; 183-192
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blood lead determinants and the prevalence of neuropsychiatric symptoms in firearm users in Mexico
Autorzy:
Aguilar Madrid, Guadalupe
Téllez-Cárdenas, Liliana
Juárez-Pérez, Cuauhtémoc A.
Haro-García, Luis C.
Mercado-García, Adriana
Gopar-Nieto, Rodrigo
Cabello-López, Alejandro
Powiązania:
https://bibliotekanauki.pl/articles/2177065.pdf
Data publikacji:
2015-11-12
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
neuropsychiatric symptoms
occupational exposure
lead exposure
blood lead
firearms
heavy metal toxicity
Opis:
Objectives To identify blood lead predictors and the prevalence of neuropsychiatric symptoms in firearm users of public security in Mexico. Material and Methods A cross-sectional study was performed on 65 males. We obtained socio-occupational data and determined venous blood lead (blood (B), lead (Pb) – BPb), as well as neuropsychiatric symptoms using the Q-16 questionnaire. A multiple linear regression model was constructed to assess determinants of BPb. Results The mean age in the study group was 34.8 years (standard deviation (SD) = 6.9, range: 21–60); the mean number of years spent in the company amounted to 14 years (SD = 8.5, range: 1–48). Twenty percent of the respondents (N = 13) used leaded glazed clay pottery (lead (Pb), glazed (G), and clay pottery (C) – PbGC) in the kitchen. During practice they fired a mean of 72 shots (SD = 60, range: 20–250), and during their whole duration of employment 5483 shots (SD = 8322.5, range: 200–50 000). The mean BPb was 7.6 μg/dl (SD = 6.8, range: 2.7–51.7). Two caretakers from the firing range had 29.6 μg/dl and 51.7 μg/dl BPb. The subjects who had shooting practice sessions ≥ 12 times a year reported a greater percentage of miscarriages in their partners (24% vs. 0%). Twelve percent of the respondents showed an increase in neuropsychiatric symptoms. The BPb multiple linear regression model explained R² = 44.15%, as follows: those who had ≥ 12 practice sessions per year – β = 0.5339 and those who used PbGC – β = 0.3651. Conclusions Using firearms and PbGC contributes to the increased BPb in the studied personnel. The determinants of BPb were: shooting practices >12 times a year and using PbGC. Blood lead concentrations reported in the study, despite being low, are a health risk, as evidenced by the prevalence of neuropsychiatric symptoms.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2016, 29, 2; 219-228
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histological Damage at Gonad of Faunus ater (Gastropod Mollusk) Obtained from Heavy Metal Contaminated River
Autorzy:
Agustina, Rahmi
Sarong, M. Ali
Yulianda, Fredinan
Suhendrayatna, -
Dewi, Ervina
Powiązania:
https://bibliotekanauki.pl/articles/952451.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Bale River
Reuleng River
heavy metal
Faunus ater
gonads
Opis:
The cause of the histological damage of Faunus ater (gastropod mollusk) gonad has been identified in the samples from two rivers, namely Bale River and Reuleng River which flow through residential, agricultural and industrial areas. The heavy metal concentration within the tissue of Faunus ater was analyzed with Atomic Absorption Spectrophotometer (Shimadzu AA 630). Meanwhile, the histological damage on gonads was observed microscopically. Afterwards, the damage levels obtained from the two respective rivers were compared and analyzed with t-test. The results confirm the histological damage that occurred in the gonads of Faunus ater collected from the two rivers. The gonadal damage of female Faunus ater from both rivers was found not to be significantly different, observed by the number of developed and damaged oocytes. It was also found that the gonads of male Faunus ater collected from Bale Riverl, have higher quantity of spermatogenic cells, in which they experience greater necrosis than the ones from Reuleng River.
Źródło:
Journal of Ecological Engineering; 2019, 20, 8; 114-119
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of heat and mass transfer in LaNi5 matrix during hydrogen absorption-desorption cycle
Autorzy:
Akanji, O. L.
Kolesnikov, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/779125.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
packed bed
reactor
stress
metal hydride
hydrogen
structural mechanics
heat transfer
mass transfer
Opis:
Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen storage systems. Some operational and design variables are major constraints to obtain a proper infl ow/outfl ow of hydrogen into a metal hydride reactor. These variables include packed bed thermal conductivity, porosity, pressure and temperature distributions in the reactor during the absorption/desorption cycle. They also cause a mechanical stress induced by temperature gradient. In this paper, two dimensional models are implemented in COMSOL multiphysics to simulate the hydrogen fl ow, pressure and temperature distributions in the packed bed reactor during absorption/desorption cycle. Also, stresses in porous metal hydride induced by temperature variation in the heating/cooling cycle were evaluated. A possible effect of stress induced, porosity changes on diffusion and heating of hydrogen in both radial and axial direction in packed bed is discussed. The model consists of a system of partial differential equations (PDE) describing structural mechanics of stress, heat and mass transfer of hydrogen in the porous matrix of the packed bed reactor.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 3; 71-76
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of industrial divinyl rubber by oxidative chlorophosphorylation and assess-ment of metal ion removal efficiency of obtained polymer sorbent
Autorzy:
Akhmedov, V. M.
Alfadul, S.
Maharramov, A. M.
Azizov, A. A.
Alosmanov, R. M.
Buniyad-Zadeh, I. A.
Powiązania:
https://bibliotekanauki.pl/articles/778480.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Divinyl rubber
modification by chlorophosphorylation
nature and distribution of phosphoric functionalities in the polymer matrix
heavy metal ions
sorption
Opis:
The main goal of this study was the preparation of materials containing phosphoric functionalities on the base of industrial polymer - divinyl rubber and the assessment of their removal efficiency of heavy metals from aqueous solutions. The new method concerns the oxidative chlorophosphorylation of divinyl rubber by PCl3 with the following modification of obtained inter-mediates to create -PO(OH)2, -OPO(OH)2&enspgroups in the polymer chain. The obtained modified polymers get some new properties such as complex formation and capability for ion exchange. The nature and distribution of phosphoric functionalities in the polymer were studied by the methods of NMRand FTIR- spectroscopy, thermal analysis and scanning electron microscopy. The sorption properties of synthesized polymers towards some cations (Cu+2, Ni+2, Co+2 and Zn+2) from water solutions have been tested. It has been shown that the metal removal efficiency of prepared material depends on pH of medium, initial concentration and type of metal ions
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 2; 112-118
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1547

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