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Auswahl der wissenschaftlichen Literatur zum Thema „G.993.5“
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Zeitschriftenartikel zum Thema "G.993.5"
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Zhang, Jun. „Preparation and Characterization of Magnetic Coal-Based Activated Carbon in the Presence of Fe3O4“. Advanced Materials Research 393-395 (November 2011): 1355–58. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.1355.
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Magnetic coal-based activated carbon was prepared from Taixi anthracitic coal in the presence of magnetite (Fe3O4). The magnetic activated carbon samples were characterized by N2 adsorption, XRD, FTIR and vibrating sample magnetometer (VSM). It was found that the magnetic activated carbon had a high surface area of 993.5 m2/g with 4% Fe3O4 and a saturation magnetization of 2.4158 emu/g for magnetic separability. The results showed that the magnetic properties of MAC are provided by Fe3O4 and Fe. In the presence of Fe3O4, the rate of carbonization and activation increase to form a large surface area and a high pore volume. Moreover, the addition of Fe3O4 can greatly promote the number of both micro-pores and meso-pores in activated carbon.
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Tkachenko, I. Y., A. G. Budko, A. Y. Mikheeva und A. I. Krylov. „The new certified reference material of chlorobenzene as a means of providing the metrological traceability for calibration and measurements“. Reference materials 16, Nr. 1 (24.06.2020): 43–55. http://dx.doi.org/10.20915/2687-0886-2020-16-1-43-55.
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The article is devoted to the development of a reference material of chlorobenzene composition, providing metrological traceability of measurement results to the State primary measurement standard of units of mass (molar) fraction and mass (molar) concentration of organic components in liquid and solid substances and materials based on liquid and gas chromatography-mass spectrometry with isotopic dilution and gravimetry GET 208-2014.The paper considers an indirect method for determining the purity of the starting substance, describes the main stages of development of the reference material, and presents the results of the evaluation of the reference material metrological characteristics, including studies on homogeneity and stability.The reference material of the composition of chlorobenzene has the following metrological characteristics: mass fraction of chlorobenzene (from 993.0 to 999.8 mg/g); molar fraction of chlorobenzene (from 99.30% to 99.98%); the expanded uncertainty of the certified characteristics is 0.02% (at k = 2).The reference material ensures metrological traceability to units of measuring instruments and measurement results, and is intended for verification, and calibration and graduations.
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El-Subruiti, G. M., A. S. Eltaweil und S. A. Sallam. „Synthesis of Active MFe2O4/γ-Fe2O3 Nanocomposites (Metal = Ni or Co) for Reduction of Nitro-Containing Pollutants and Methyl Orange Degradation“. Nano 14, Nr. 10 (Oktober 2019): 1950125. http://dx.doi.org/10.1142/s179329201950125x.
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Metal-ferrite/maghemite nanocomposites (NiFe2O4/***[Formula: see text]-Fe2O3 and CoFe2O4/[Formula: see text]-Fe2O[Formula: see text] were synthesized via doping maghemite with metal salt (NiCl2 or CoCl[Formula: see text] followed by reduction of metal ions using NaBH4. The synthesized metal-ferrite/maghemite nanocomposites were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Fourier transform infrared (FTIR) and the amounts of the dopant-metal (Ni/Co) were determined using ICP-OES technique. Results showed that this synthetic route produced nanocomposites with highly active ferrite phases MFe2O4. The synthesized nanocomposites exhibited exceptional catalytic activities for the reduction of 4-nitrophenol and 2-nitroaniline as well as the catalytic degradation of methyl orange. Specific activity parameter of NiFe2O4/[Formula: see text]-Fe2O3 and CoFe2O4/[Formula: see text]-Fe2O3 toward reduction of 4-NP reached 993.9 and 929.8[Formula: see text]s[Formula: see text][Formula: see text]g[Formula: see text], respectively. These high values of specific activities are higher than most reported metal-ferrite composites prepared via traditional co-precipitation methods. Besides, strong magnetic properties of the prepared metal-ferrite/maghemites facilitates easy separation process for several reuses.
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Gülen ÖZYAZICI. „Azotlu Gübre Dozlarının Karabuğday (Fagopyrum esculentum Moench.) Bitkisinin Tohum Verimi ve Bazı Tarımsal Özelliklerine Etkisi“. ISPEC Journal of Agricultural Sciences 4, Nr. 3 (16.09.2020): 635–48. http://dx.doi.org/10.46291/ispecjasvol4iss3pp635-648.
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Bu araştırmada, azot dozlarının karabuğday (Fagopyrum esculentum Moench.) bitkisinin tohum verimi ve bazı tarımsal özelliklerine etkisinin ortaya konulması amaçlanmıştır. Araştırma, Siirt ekolojik koşullarında 2020 yılında yürütülmüştür. Çalışmada, azotlu gübrenin (N0= 0 kg da-1 N, N4= 4 kg da-1 N, N8= 8 kg da-1 N, N12= 12 kg da-1 N, N16= 16 kg da-1 N) 5 farklı dozu faktör olarak ele alınmıştır. Araştırma sonuçlarına göre, azot dozlarının karabuğday bitkisinin tohum verimi, verime etkili bazı tarımsal özellikleri ile protein oranı üzerine anlamlı etkilerinin olduğu belirlenmiştir. Araştırmada en yüksek; dal sayısı, yaprak sayısı, kömeç sayısı, tohum verimi, bin tane ağırlığı ve protein oranı N12 dozunda saptanmıştır. En yüksek bitki boyu, N12 ve N16 azot dozlarında belirlenmiştir. En yüksek biyolojik verim ise N16 dozunda tespit edilmiştir. Azot dozlarına göre bitki boyu 63.00-71.50 cm, dal sayısı 3.28-5.00 adet bitki-1, yaprak sayısı 19.25-31.00 adet bitki-1, kömeç sayısı 12.75-23.50 adet bitki-1, biyolojik verim 361.1-993.6 kg da-1, tohum verimi 58.8-149.2 kg da-1, bin tane ağırlığı 19.39-23.52 g, protein oranı % 10.72-13.65 arasında değişim göstermiştir. Organik madde içeriği düşük topraklarda, karabuğday yetiştiriciliğinde tohum verimi yönünden 11.48 kg da-1 azot uygulanabileceği sonucuna varılmıştır.
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Numbere, Aroloye O. „Bioaccumulation of Total Hydrocarbon and Heavy Metals in Body Parts of the West African Red Mangrove Crab (Goniopsis pelii) in the Niger Delta, Nigeria“. International Letters of Natural Sciences 75 (Mai 2019): 1–12. http://dx.doi.org/10.18052/www.scipress.com/ilns.75.1.
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This study is based on bioaccumulation of total hydrocarbon (THC) and heavy metals in body parts of the West African red mangrove crab (G. pelii), which inhabit polluted mangrove forests. Thirty crabs were captured in October, 2018 and sorted into male and female. Their lengths and widths were measured, and body parts dismembered and oven-dried at 70 ͦ C for 48 hours. Physicochemical analysis for Cadmium (Cd), Zinc (Zn), Lead (Pb) and THC was measured by spectrophotometric method using HACH DR 890 colorimeter (wavelength 420 nm) and microwave accelerated reaction system (MARS Xpress, North Carolina) respectively. There was no significant difference (P > 0.05) in THC and heavy metals in the body parts of crabs. However, Zinc was highest in claw (993.4±91.3 mg/l) and body tissues (32.5±1.9 mg/l), Pb was highest in carapace (34.6±2.8 mg/l) and gill (151.9±21.6 mg/l) while THC was highest in intestine (39.5±2.9 mg/l) and gut (52.4±13.4 mg/l). The order of concentration is Zn>Pb>THC>Cd. Male crabs had slightly higher THC and heavy metal concentration than female crabs probably because of their large size. There is negative correlation between carapace area and THC concentration (R = -0.246), meaning THC decreases with increasing carapace size. Internal parts of crab had higher THC and heavy metal concentration than external parts. These results show that there is high bioaccumulation of THC and heavy metals in crab, which is above WHO/FAO standard. This implies that the crabs are unfit for human consumption. The smaller the crab the better it is for consumption in terms of bioaccumulation of pollutants.
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Panwar, B., I. Kádár, B. Bíró, K. Rajkai-Végh, P. Ragályi, M. Rékási und L. Márton. „Phytoremediation: Enhanced cadmium (Cd) accumulation by organic manuring, EDTA and microbial inoculants (Azotobacter sp., Pseudomonas sp.) in Indian mustard (Brassica juncea L.)“. Acta Agronomica Hungarica 59, Nr. 2 (01.06.2011): 117–23. http://dx.doi.org/10.1556/aagr.59.2011.2.2.
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Phytoremediation is an approach designed to extract excessive heavy metals from contaminated soils through plant uptake. Cadmium (Cd) is among the elements most toxic to living organisms. Health hazards associated with the lethal intake of Cd include renal (kidney) damage, anaemia, hypertension and liver damage. A greenhouse experiment was carried out with Indian mustard (Brassica juncea) grown on artificially spiked soil (100 μg Cd g−1) with EDTA (2 mmol kg−1 in 5 split doses), FYM, vermicompost (VC) and microbial inoculants (MI) such as Azotobacter sp. and Pseudomonas sp. The growth of Brassica juncea L. was better in soil amended with FYM or VC as compared to unamended Cd-polluted soil. Growth was slightly suppressed in EDTA-treated soil, whereas it was better after treatment with MI. The application of FYM and VC increased the dry matter yield of Indian mustard either alone or in combination with microbial inoculants, while that of EDTA caused a significant decrease in the biomass of Indian mustard. The application of microbial inoculants increased the dry matter yield of both the roots and shoots, but not significantly, because MI shows greater sensitivity towards cadmium. The maximum cadmium concentration was observed in the EDTA +MI treatment, but Cd uptake was maximum in the VC + MI treatment. The Cd concentration in the shoots increased by 120% in CdEDTA over the Cd100 treatment, followed by CdVC (65%) and CdFYM (42%) in the absence of microbial inoculants. The corresponding values in the presence of MI were 107, 51 and 37%, respectively. A similar trend was also observed in the roots in the order CdEDTA+M > CdVC+M > CdFYM+M>Cd100+M.MI caused an increase in Cd content of 5.5% in the roots and 4.1% in the shoots in the CdEDTA+M treatment compared with the CdEDTA treatment. FYM, VC and EDTA also increased Cd uptake significantly both in the shoots and roots with and without microbial inoculants.The results indicated that Vermicompost in combination with microbial inoculants is the best treatment for the phytoremediation of Cd-contaminated soil by Indian mustard, as revealed by the Cd uptake values in the shoots: CdVC+M (2265.7 μg/pot) followed by CdEDTA+M (2251.2 μg/pot), CdFYM+M (1485.7 μg/pot) and Cd100+M (993.1 μg/pot).
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Albassam, Nuha, Faroq M. Al Habib und Saddam M. Hassan. „Studying Cholesterol and Triglyceride Levels in Some Types of Fish in Salah Al-Din Governorate“. Al-Qadisiyah Journal Of Pure Science 26, Nr. 4 (17.07.2021). http://dx.doi.org/10.29350/qjps.2021.26.4.1409.
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The study included seven common types of fish in the Iraqi local market in Salah al-Din Governorate / Tikrit, which are (Carasobarbus luteus, Alburnus mossulensis, Cyprinion kais, Chondrostoma regium, Barbus barbulus, Barbus belayewi, Barbus subquincunciatus). The study of cholesterol and triglycerides of these types of fish showed that the cholesterol levels in the experimental fish were (104.55-9.56 -6.37-9.56 -14.88-51.03-15.94) mg/100 g in the mentioned fish, respectively, and the highest level of cholesterol was in the Carasobarbus luteus fish and it reached 104.55 mg /100gm, and the lowest level in Cyprinion kais is 6.37mg/100gm. The study stated the levels of triglycerides are (990 -348 -993.5 -665.9 -703.5 -1355.2-882.2) mg/kg for fish (Carasobarbus luteus, Alburnus mossulensis, Cyprinion kais, Chondrostoma regium, Barbus barbulus, Barbus belayewi, Barbus subquincunciatus) respectively. The highest level of triglycerides is 1355.2 mg/kg. kg in Barbus belayewi fish and the lowest level in Alburnus mossulensis 348 mg/kg.
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Xia, Baoyun, Benjamin C. Blount, Tonya Guillot, Christina Brosius, Yao Li, Dana M. Van Bemmel, Heather L. Kimmel et al. „Tobacco-Specific Nitrosamines (NNAL, NNN, NAT, and NAB) Exposures in the US Population Assessment of Tobacco and Health (PATH) Study Wave 1 (2013–2014)“. Nicotine & Tobacco Research, 27.07.2020. http://dx.doi.org/10.1093/ntr/ntaa110.
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Abstract Introduction The tobacco-specific nitrosamines (TSNAs) are an important group of carcinogens found in tobacco and tobacco smoke. To describe and characterize the levels of TSNAs in the Population Assessment of Tobacco and Health (PATH) Study Wave 1 (2013–2014), we present four biomarkers of TSNA exposure: N′-nitrosonornicotine, N′-nitrosoanabasine, N′-nitrosoanatabine, and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL) which is the primary urinary metabolite of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone. Methods We measured total TSNAs in 11 522 adults who provided urine using automated solid-phase extraction coupled to isotope dilution liquid chromatography–tandem mass spectrometry. After exclusions in this current analysis, we selected 11 004 NNAL results, 10 753 N′-nitrosonornicotine results, 10 919 N′-nitrosoanatabine results, and 10 996 N′-nitrosoanabasine results for data analysis. Geometric means and correlations were calculated using SAS and SUDAAN. Results TSNA concentrations were associated with choice of tobacco product and frequency of use. Among established, every day, exclusive tobacco product users, the geometric mean urinary NNAL concentration was highest for smokeless tobacco users (993.3; 95% confidence interval [CI: 839.2, 1147.3] ng/g creatinine), followed by all types of combustible tobacco product users (285.4; 95% CI: [267.9, 303.0] ng/g creatinine), poly tobacco users (278.6; 95% CI: [254.9, 302.2] ng/g creatinine), and e-cigarette product users (6.3; 95% CI: [4.7, 7.9] ng/g creatinine). TSNA concentrations were higher in every day users than in intermittent users for all the tobacco product groups. Among single product users, exposure to TSNAs differed by sex, age, race/ethnicity, and education. Urinary TSNAs and nicotine metabolite biomarkers were also highly correlated. Conclusions We have provided PATH Study estimates of TSNA exposure among US adult users of a variety of tobacco products. These data can inform future tobacco product and human exposure evaluations and related regulatory activities.
Dissertationen zum Thema "G.993.5"
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Rada, Dominik. „Přenosová technologie G.mgfast“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442370.
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The master thesis deals with G.fast and G.mgfast transmission technologies, including their parameters. The work deals with the principle of vector DMT modulation and the possibility of time duplex TDD and full-duplex FDX in two-way communication used in these technologies. The following is a description of the line using the KHM model, which is suitable for simulations in the transmission band using G.fast and G.mgfast technologies. Subsequently, the disturbing effects of crosstalk at the near end of NEXT and the far end of FEXT and their elimination with these technologies are discussing. Part of the work explains supporting calculations to determine the SNR and bit allocation to calculate the baud rate. The work describes the methods of compensation of crosstalk FEXT and NEXT, which affect the resulting baud rate. The work also includes an application for simulation of transmission speed as a function of distance for G.fast and G.mgfast technologies, allowing changing input parameters and adjusting the transmission bandwidth based on G.9700 and G.9701 standards. Also, in work, an application is created to display the compensation of the influence of the transmitted signal crosstalk FEXT and NEXT, which allow the import of measured crosstalk between individual participants. The issue of influencing crosstalk for accurate measurements in the laboratory is also discussing. An application in the MATLAB environment is creating to display the measured characteristics.