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Tytuł:
Financial Development and Sustainable Competitiveness in Arctic Region: A Dynamic Panel Data Analysis
Rozwój finansowy i zrównoważona konkurencyjność w regionie Arktyki: analiza dynamiczna danych panelowych
Autorzy:
Yahya, Farzan
Abbas, Ghulam
Hussain, Muhammad
Waqas, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2080650.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
Tematy:
sustainable competitiveness
financial development
social cohesion
resource intensity
natural capital
zrównoważona konkurencyjność
rozwój finansowy
zasobochłonność
spójność społeczna
kapitał naturalny
Opis:
The present study investigates the effect of financial development on sustainable competitiveness and its components (natural capital, resource intensity, and social cohesion) in the Arctic region. We employ bank-based, stock-market based, and composite index to measure financial development. To deal with endogeneity bias, system GMM is utilized. The results show a positive and significant effect of financial development on sustainable competitiveness. The estimates also assert that financial development encourages resource efficiency and social cohesion in the region. In contrast, we find the negative effect of financial development on natural capital. This suggests that overexploitation of natural resources may provide short-term benefits to the local and regional communities but it may threaten the long-term sustainability of the Arctic. Thus, the financial sector should be guided to support financing and investing activities in alternative eco-friendly technologies and ventures for reducing excessive natural resource utilization.
W niniejszej pracy zbadano wpływ rozwoju finansowego na zrównoważoną konkurencyjność i jej komponenty (kapitał naturalny, zasobochłonność i spójność społeczną) w regionie Arktyki. Do pomiaru rozwoju finansowego stosujemy indeksy bankowe, giełdowe i złożone. Aby poradzić sobie z błędem endogenności, wykorzystywany jest system GMM. Wyniki pokazują pozytywny i znaczący wpływ rozwoju finansowego na zrównoważoną konkurencyjność. Szacunki potwierdzają również, że rozwój finansowy sprzyja efektywnemu gospodarowaniu zasobami i spójności społecznej w regionie. Z drugiej strony dostrzegamy negatywny wpływ rozwoju finansowego na kapitał naturalny. Sugeruje to, że nadmierna eksploatacja zasobów naturalnych może przynieść krótkoterminowe korzyści społecznościom lokalnym i regionalnym, ale może zagrozić długoterminowej stabilności Arktyki. Sektor finansowy powinien zatem kierować się wspieraniem finansowania i inwestowania w alternatywne technologie przyjazne dla środowiska oraz przedsięwzięcia mające na celu ograniczenie nadmiernego wykorzystania zasobów naturalnych.
Źródło:
Problemy Ekorozwoju; 2022, 17, 1; 267--278
1895-6912
Pojawia się w:
Problemy Ekorozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phosphorous transformation as influenced by different levels of phosphorous alone and in combination with humic acid
Autorzy:
Jamal, Aftab
Hussain, Iqrar
Sarir, Muhammad Sarirullah
Fawad, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/1177484.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Humic acid
Incubation
SSP
phosphorous transformation
Opis:
An incubation experiment was carried out in completely randomized design (CRD) at the laboratory of soil and environmental sciences, the university of Agriculture Peshawar, Pakistan to investigate changes in AB-DTPA extractable soil Phosphorous (P) with the addition of Humic acid (HA) and added P levels as single super phosphate (SSP). Two levels of HA including control (H0: control and H1: 500 g ha-1) and four levels of P as single super phosphate (SSP) including control (P0: control, P1: 60 kg ha-1, P2: 90 kg ha-1, and P3: 150 kg hectare) were utilized. Soil treated with different levels of SSP alone or reinforced with HA showed an initial decline in AB-DTPA extractable P in first 14 days and then rapid mineralization up to 56 days of incubation in the laboratory. HA increased mean available P by 44.93, 16.08 and 7.25 % at 0, 60 and 90 kg P205 ha-1. Weekly turnover of P ranged from 0.19 to 0.43 mg P kg-1 soils for soils treated with different levels of SSP alone or reinforced with HA. HA increased weekly turnover by 40 and 8.82 % at 60 and 90 kg P205 ha-1 as SSP respectively. HA applied alone or reinforced with 60 and 90 kg P205 ha-1 increased mean available P, weekly turnover of P as well as mineralization potential.
Źródło:
World Scientific News; 2018, 102; 173-179
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Solublising Aids on The Entrapment of Loratidine in Pre-Fabricated PVA Filaments Used for FDM Based 3D-Printing
Autorzy:
Mahmood, Faisal
Hussain, Amjad
Arshad, Muhammad Sohail
Abbas, Nasir
Irfan, Muhammad
Qamar, Nadia
Hussain, Fahad
Ghori, Muhammad Usman
Powiązania:
https://bibliotekanauki.pl/articles/895332.pdf
Data publikacji:
2020-02-29
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
3D printing
Plasticizers
Fused deposition modelling (FDM)
PVA filaments
Solubilizers
Opis:
Low drug loading efficiency is the limiting factor in the use of pre-fabricated filaments for 3D printing of pharmaceuticals. The aim of present study was to modify the material properties of pre-fabricated filament by incorporating the suitable solubilizing aids in order to enhance the drug loading efficiency. Loratadine was loaded into PVA filaments by using solubilizers (Soluplus®, Sodium lauryl sulphate) and plasticizers (glycerin and Polyethylene glycol-400) and the printability of filaments was investigated. The treated filaments were characterized for morphology and diameter changes, drug content, FTIR and thermal properties and printed into tablets of suitable dimensions. The printed tablets were also characterized for drug assay and drug release. The results have shown that the surface of different drug loaded filaments become rough with almost no change in diameter hence, these filaments remained printable. However, there was 7 to 24 times enhancement in drug content of filaments treated with particularly those pretreated with glycerin and soaked in drug solution containing Soluplus. The printed tablets have also shown almost similar drug content as their precursor filaments and the release followed diffusion mechanism in most of the formulations. The study concludes that the treatment of PVA filament with solubilizer aids has significantly improved the drug loading entrapment without compromising the printability.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 1; 175-182
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fourth industrial revolution: a way forward to attain better performance in the textile industry
Autorzy:
Ślusarczyk, Beata
Haseeb, Muhammad
Hussain, Hafezali Iqbal
Powiązania:
https://bibliotekanauki.pl/articles/1396505.pdf
Data publikacji:
2019
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
Industry 4.0
firm performance
cyber physical system
interoperability
smart product
smart city
Przemysł 4.0
wydajność firmy
system cyberfizyczny
interoperacyjność
inteligentny produkt
inteligentne miasto
Opis:
The textile industry is one of the fastest growing industries which expressively contributes to the economic growth of Malaysia. However, in recent years, the situation has changed and demonstrates a downward trend. The imports are growing faster compared to the exports, consequently resulting in a low contribution to the gross domestic product (GDP). To address the issue, this study aims to investigate the role of Industry 4.0 on the performance of firms engaged in the production and services of the Malaysian textile industry. To achieve the objective, this study adopted a cross-sectional research design. A survey was carried out to collect data from employees of textile firms. Results of the study found that Industry 4.0 positively contributed to the effectiveness of the production and services of the textile industry. Production and services have a positive role in the performance of textile firms. The current study provides an interesting insight into the future direction of research for studies on organisational performance, which can be extended to different manufacturing-based industries. In addition, it provides the rationale for the adoption and implementation of smart technologies in these industries. It has been found that cyber-physical systems (CPS), interoperability, a smart city and a smart product have a positive effect on production and services. Additionally, it is not possible without the effective implementation of technology. Thus, the current study provides valuable insights into the improvement of the textile industry’s performance.
Źródło:
Engineering Management in Production and Services; 2019, 11, 2; 52-69
2543-6597
2543-912X
Pojawia się w:
Engineering Management in Production and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Gamma Kumaraswamy-G family of distributions: theory, inference and applications
Autorzy:
Arshad, Rana Muhammad Imran
Tahir, Muhammad Hussain
Chesneau, Christophe
Jamal, Farrukh
Powiązania:
https://bibliotekanauki.pl/articles/1059046.pdf
Data publikacji:
2020-12-04
Wydawca:
Główny Urząd Statystyczny
Tematy:
stochastic ordering
Opis:
In this paper, we introduce a new family of univariate continuous distributions called the Gamma Kumaraswamy-generated family of distributions. Most of its properties are studied in detail, including skewness, kurtosis, analytical comportments of the main functions, moments, stochastic ordering and order statistics. The next part of the paper focuses on a particular member of the family with four parameters, called the gamma Kumaraswamy exponential distribution. Among its advantages, the following should be mentioned: the corresponding probability density function can have symmetrical, left-skewed, right-skewed and reversed-J shapes, while the corresponding hazard rate function can have (nearly) constant, increasing, decreasing, upside-down bathtub, and bathtub shapes. Subsequently, the inference on the gamma Kumaraswamy exponential model is performed. The method of maximum likelihood is applied to estimate the model parameters. In order to demonstrate the importance of the new model, analyses on two practical data sets were carried out. The results proved more favourable for the studied model than for any of the other eight competitive models.
Źródło:
Statistics in Transition new series; 2020, 21, 5; 17-40
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation Based Measuring the Benefits of Converting to Lean Product Design and Development: A Case Study of Manufacturing Sector of Pakistan
Autorzy:
Sajid, Muhammad
Wasim, Ahmad
Hussain, Salman
Jahanzaib, Mirza
Powiązania:
https://bibliotekanauki.pl/articles/102672.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
decision making
discrete event simulation
lean product development
lean enablers
podejmowanie decyzji
dyskretna symulacja zdarzeń
rozwój produktu tańszego
umożliwienie tańszego działania
Opis:
Designers are facing the principal problems of effective decision making at the initial design stage of product development, which ultimately contribute to profit loss, low quality and increased time to launch the product onto the market. It requires a lot of knowledge and experience. Tools are required to analyze and ensure that crucial decisions have strong foundation before implementation. Discrete event simulation provides such a tool and has got potential to assist in decision making before final implementation. This research work aims measuring the benefits of transformation to lean product development (LPD) via simulation. Simulink-MATLAB tool was used for this purpose. The whole work is limited to design and cost estimation cells of a manufacturing company and consists of two phases. The first phase deals with the assessment of current working model of design and cost estimation cells. The areas for improvements were recognized at this phase. The proposed model for transformation to LPD was developed in the second phase. Four lean enablers namely product values, knowledge-based engineering, set-based concurrent engineering and poke-yoke were incorporated to further enhance the operation of the proposed model. This research work constitutes a useful case for practitioners. Keywords: decision making, discrete event simulation, lean product development, lean enablers
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 1; 128-137
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Image encryption based on Chebyshev chaotic map and S8 S-boxes
Autorzy:
Hussain, Iqtadar
Anees, Amir
Alkhaldi, Ali Hussain
Aslam, Muhammad
Siddiqui, Nasir
Ahmed, Rehan
Powiązania:
https://bibliotekanauki.pl/articles/173918.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
image encryption
chaos
noise-resistant
statistical analysis
key sensitivity
Opis:
The encryption of image data is artful as compare to others due to some special characteristics such as entropy, contrast, the correlation between the pixels, intensity, and homogeneity. During encryption process, it is conventionally not easy to manage these characteristics with non-chaotic cryptosystems. Therefore for the sake of strong encryption algorithms, in last decades many cryptographers have presented invulnerable schemes for image encryption based on the chaotic maps. This manuscript aims to propose a strong encryption scheme based on a symmetric group of permutation advanced encryption standard (AES) substitution boxes and modified Chebyshev map. Principally, the secret key depends upon the parameters of Chebyshev map to create confusion in the main image and is encrypted by the scheme made from the S8 AES S-boxes and chaotic map. By this procedure, one can obtain an encrypted image that is entirely twisted. The results of analyses showed that the presented image encryption is strong and invulnerable.
Źródło:
Optica Applicata; 2019, 49, 2; 317-330
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Linear Impact of Textile and Clothing Manufacturing on Economic Growth: The Case of Top-Asian Economies
Nieliniowy wpływ produkcji tekstyliów i odzieży na wzrost gospodarczy: przypadek największych gospodarek azjatyckich
Autorzy:
Hussain, Hafezali Iqbal
Haseeb, Muhammad
Kot, Sebastian
Jermsittiparsert, Kittisak
Powiązania:
https://bibliotekanauki.pl/articles/234011.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
textile manufacturing
clothing manufacturing
economic growth
Asian economy
quantile
produkcja tekstyliów
produkcja odzieży
wzrost gospodarczy
gospodarka azjatycka
kwantyl
Opis:
The potential contribution of the textile sector is not limited to the local economy but it also represents a country’s image in the global market. It carries the initial boom for most emerging nations in their journey towards improved economic growth. The present study employs Quantile on Quantile regression, which is a unique methodology and has the tendency to establish the relationship between variables that are non-linear in nature across various quantile distributions. Moreover, the method stated helps in explaining the asymmetric response in the quantiles of economic growth of the countries studied caused by the quantiles of the textile and clothing industry. The quarterly data ranges from 1990 to 2018, and findings therefrom endorse the presence of a positive relationship between TTC and economic growth in all Asian Countries studied. In addition to this, the direction of the relationships in the quantiles was also evaluated by Granger causality, which revealed the presence of bidirectional causal effects in all countries, excluding Japan, Pakistan and Turkey, where it was found as uni-directional. Lastly, based on the findings, the government and policy making institutions are recommended for the introduction of certain programs thatwill incentivize and provide subsidies to potential investors, thus relaxing the competition for new entrants in the TTC sector.
Potencjalny wkład sektora tekstylnego nie ogranicza się do lokalnej gospodarki, ale reprezentuje również wizerunek kraju na rynku światowym. Niesie to początkowy rozkwit większości krajów wschodzących na ich drodze do lepszego wzrostu gospodarczego. W badaniu zastosowano metodę regresji kwantylowej, która jest unikalną metodologią i ma tendencję do ustalania relacji między zmiennymi o nieliniowym charakterze w różnych rozkładach kwantyli. Podana metoda pomaga ponadto w wyjaśnieniu asymetrycznej odpowiedzi w kwantylach wzrostu gospodarczego badanych krajów spowodowanej przez kwantyle przemysłu tekstylno-odzieżowego. Dane kwartalne obejmują okres 1990-2018, a ustalenia z tych lat potwierdzają istnienie pozytywnego związku między TTC a wzrostem gospodarczym we wszystkich badanych krajach azjatyckich. Oprócz tego, kierunek relacji w kwantylach został również oceniony przez przyczynowość Grangera, która ujawniła obecność dwukierunkowych efektów przyczynowych we wszystkich krajach, z wyjątkiem Japonii, Pakistanu i Turcji, gdzie stwierdzono je jako jednokierunkowe. Na podstawie ustaleń, zaleca się instytucjom rządowym i tworzącym politykę wprowadzenie pewnych programów, które będą motywować i zapewniać dotacje potencjalnym inwestorom, łagodząc w ten sposób konkurencję dla nowych podmiotów w sektorze TTC.
Źródło:
Fibres & Textiles in Eastern Europe; 2020, 5 (143); 27-36
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of safety climate on job performance and job satisfaction with moderating role of psychological capital
Autorzy:
Kiyani, Amir Saif Ali
Rizvi, Tahir Hussain
Khan, Muhammad Saqib
Powiązania:
https://bibliotekanauki.pl/articles/1375509.pdf
Data publikacji:
2019
Wydawca:
Międzynarodowy Instytut Innowacji Nauka – Edukacja – Rozwój w Warszawie
Tematy:
Safety climate
Job Satisfaction
Job Performance
psychological Capital
Conserva-tion of Resource Theory
Public Sector Organization Rawalpindi and Islamabad
Opis:
The current research investigated the effect of safety climate on job satisfaction and job performance with psychological capital as a moderator between safety climate and job satisfaction as well as job performance. This research fills the gap by collecting empirical evidence from the emerging organizations of Pakistan. Conservation of resource theory (COR) is relevant to the research area. Data were collected from 300 employees from different Organizations. The current study is empirical and quantitative-based study is used to conducted research. Data were collected by convenient non-probability sampling techniques to be used and collected from employees working in the reputed organization; Chemical, Cement, Petroleum, Oil and Gas industry of Islamabad and Rawalpindi. Confirmatory Factor analysis was done through AMOS and hypotheses were tested through SPSS regression analysis process of Hayes model. To test the moderation effects, the process of Hayes model 1 was also performed. Safety climate has a positive relationship with the two DVs which are job performance and job satisfaction. Moreover, Psychological Capital played a significant moderating role between safety climate and job satisfaction as well as job performance. When Psychological capital was high, the relationship between safety climate and job performance as well as the relationship between safety climate and job satisfaction were stronger. These results are important for future studies. This research recommended top management and responsible authorities to promote safety climate activates between their organization in order to enhance their employees satisfy and high performed. Moreover, this research strongly recommends psychological capital amongst organization looking for highly satisfied and effective employees. Further implications for practice were discussed in detail.
Źródło:
International Journal of New Economics and Social Sciences; 2019, 9(1); 363-379
2450-2146
2451-1064
Pojawia się w:
International Journal of New Economics and Social Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of Relay-Assisted Device-to-Device Communication
Autorzy:
Hussain, Zakir
Mehdi, Haider
Saleem, Syed Muhammad Atif
Mahboob, Aashir
Powiązania:
https://bibliotekanauki.pl/articles/2134046.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CCI signals
D2D communication
k-m shadowed fading
kappa-my shadowed fading
outage probability
relay
Opis:
Outage and Success performances of an amplify-and-forward relay-assisted D2D communication system over a κ-μ shadowed fading wireless link are presented here. Co-channel interference (CCI) is assumed to affect the D2D signals at relay and destination nodes. The system is analyzed with two scenarios, namely, with diversity combining and without diversity combining. Selection combining (SC) based diversity scheme is incorporated at the D2D receiver to combat fading conditions. The expressions for success and outage probabilities are presented by using the characteristic function approach. The expressions are functions of path-loss exponents, wireless link length between relay and D2D source node, wireless link length between the receiver node and relay, distances between interferers and the relay node, CCI distances from various devices of the system, fading channel. The numerical analysis for various scenarios is presented and analyzed.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 587--593
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological spectra of vegetation of Sathan Gali, Mansehra, KPK, Pakistan
Autorzy:
Khan, Khalid Rasheed
Ishtiaq, Muhammad
Iqbal, Zafar
Alam, Jan
Shah, Abbas Hussain
Farooq, Muhammad
Mehmood, Azhar
Powiązania:
https://bibliotekanauki.pl/articles/1179005.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Biological spectrum
Mansehra
Pakistan
Sathan Gali
Therophytes
Opis:
The present study was carried out to assess the biological spectra of the existing vegetation of Sathan Galli, District Mansehra of Khyber Pakhtoonkhawa (KPK) Pakistan. In this study, area under investigation was divided into 33 stands on the basis of physiognomic characteristics of the vegetation. A total of 105 plant species of 55 families were recorded. The leaf size spectra was dominated by Microphyll contributing 68 species, followed by Mesophylls 45 species, Nanophyll 41 species, Macrophyll and Leptophylls l7 species. Therophytes were found as leading life form of the area encompassing 30.35% species, followed by Hemicryptophytes 20.23% and Megaphanerophytes 16.66%. The biological spectra indicating prevailing climatic conditions of the area and adaptation of vegetation to these conditions. The finding of current exploration revealed that Therophytes and Microphyll were dominant in the study area depicting heavy biotic pressure due to deforestation, over grazing and soil erosion.
Źródło:
World Scientific News; 2017, 87; 136-149
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FORMULATION AND EVALUATION OF INDOMETHACIN LOADED NANOSPONGES FOR ORAL DELIVERY
Autorzy:
Abbas, Nasir
Sarwar, Komal
Irfan, Muhammad
Hussain, Amjad
Mehmood, Rabia
Arshad, Muhammad S.
Shah, Pervaiz A.
Powiązania:
https://bibliotekanauki.pl/articles/895238.pdf
Data publikacji:
2018-10-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
sustained release
indomethacin
Nanosponges
Emulsion solvent diffusion method
Franz diffusion cell
Opis:
Nanosponges (NS) loaded sustained release tablet formulations of a non-steroidal anti-inflammatory drug; Indomethacin were successfully developed and evaluated for their pharmaceutical properties. Twelve nanosponge formulations were fabricated by solvent diffusion method by using different ratios of drug and polymers (ethyl cellulose and polyvinyl alcohol). Particle size of all the formulations was in the nano range of 221 to 625 nm and it was found dependent on the polymer concentration. Drug loading and entrapment efficiency was ranged in 32.2 to 59.4 % and 30.1 to 64.8 %, respectively. Formulations with equal proportion of drug and polymer resulted in higher values of drug loading and entrapment efficiency. Percent yield was also found dependent on the relative drug polymer ratio with highest value of 51 % was achieved for the formulation having same drug to polymer ratio. SEM results confirmed the formation of spherical and porous structures. Structural analysis by Fourier transform infrared spectroscopy (FTIR), powder x-ray diffraction (PXRD) showed the absence of any interaction between drug and polymer. In comparison to pure drug, NS formulations showed a linear intrinsic dissolution rate (IDR) profile depicting a controlled release profile. Diffusion studies of NS formulations performed by Franz diffusion cell and dialysis bag methods showed comparable results in terms of precision and linearity of diffusion profile. Tablets prepared from the drug loaded NS showed acceptable values for hardness, friability and drug content. Release of drug from NS tablets was confirmed as sustained release behaviour.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 5; 1201-1213
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zinc and graphene oxide composites as new protective coatings for oil and gas pipes
Kompozyty cynku i tlenku grafenu jako nowe powłoki ochronne rur do przesyłu nafty i gazu
Autorzy:
Asghar, M. Sajid Ali
Amir, Muhammad
Hussain, Umer
Sabri, Mohammed M.
Powiązania:
https://bibliotekanauki.pl/articles/24202808.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
corrosion resistance
graphene oxide
Hummers method
nanocomposites
electrophoretic deposition
odporność na korozję
tlenek grafenu
metoda Hummersa
nanokompozyty
osadzanie elektroforetyczne
Opis:
A method was developed to obtain a durable coating consisting of zinc and graphene oxide (Zn-GO) in order to reduce the mechanical wear and tear rate of oil and gas pipelines made of steel. Graphene oxide was obtained from graphite by wet chemical oxidation (unmodified and modified Hummers’ method) using potassium permanganate and sulfuric acid. The process was carried out at various temperatures. The steel was covered with an ultrathin layer of Zn-GO using the electrophoretic deposition method. The GO particle size (< 90 nm) was confirmed by XRD and laser analysis. For GO particles obtained by the modified Hummers’ method, a significant correlation was observed in the scratch (R2 = 0.87) and the Vickers microhardness tests (R2 = 0.93), which indicates a lower wear rate of Zn-GO-coated steel.
Opracowano metodę otrzymywania trwałej powłoki składającej się z cynku i tlenku grafenu (Zn-GO) w celu zmniejszenia zużycia mechanicznego rurociągów naftowo-gazowych wykonanych ze stali. Tlenek grafenu pozyskano z grafitu metodą mokrego utleniania chemicznego (niezmodyfikowana i zmodyfikowana metoda Hummersa) z użyciem nadmanganianu potasu i kwasu siarkowego. Proces prowadzono w różnej temperaturze. Stal powlekano ultra cienką warstwą Zn-GO techniką osadzania elektroforetycznego. Metodą XRD i analizą laserową potwierdzono wielkość cząstek GO (≤ 90 nm). Dla cząstek GO otrzymanych zmodyfikowaną metoda Hummersa zaobserwowano znaczącą korelację w teście zarysowania (R2 = 0.87) i mikrotwardości Vickersa (R2 = 0.93), co świadczy o mniejszym stopniu zużycia stali pokrytej powłoką Zn-GO.
Źródło:
Polimery; 2023, 68, 7-8; 378--385
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diversity, phenology and biological spectrum of tree flora in upper Tanawal, district Mansehra, KP, Pakistan
Autorzy:
Farooq, Muhammad
Anjum, Waleed
Hussain, Manzoor
Saqib, Zafeer
Shah, Abbas Hussain
Khan, Khalid Rasheed
Nazir, Junaid
Gul, Sagheer
Powiązania:
https://bibliotekanauki.pl/articles/1112996.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Floristic checklist
Mansehra
Pakistan
Phanerogamic plants diversity
Upper Tanawal
Opis:
Upper Tanawallies is in the middle of the Western part of Hazara division, and includes the remote areas of four districts i.e. Mansehra, Abbottabad, Haripur and Tor-Ghar, having latitude 34°.34.40´ N to 34°.48.88´ N and 72°.84.27´ E to 73°.10.50´ E longitude. This area is loaded with plant diversity, and tree species in this area vary in their life form, leaf spectra and phenological behavior. There is no prior record of plants diversity in the area, hence, this study was conducted to explore the tree diversity, life form, leaf spectrum and phenology of the tree flora. A total 127 sampling stands (10 x 10 m2) were put into place in different locations in Upper Tanawallies to collect field data using the quadrat method. As an outcome, we learned that the region hosts 53 different tree species of 39 genera belonging to 25 tree families. The biological spectra of the trees were constructed according to Raunkiaer (1934). Results showed that Mesophanerophytes was the dominant life form class, contributing 34 (64%) of all tree species encountered, while Mesophyll and Microphyll was the dominant leaf size spectrum classes, each contributing to a count of 18 (34%) of all tree species. Frequent field visits were also carried out during the flowering and fruiting seasons in 2016/17. The result indicates that most tree species of the area show flowering during April-May (32%) while, maximum fruiting were recorded in June-July (36%). Our study concludes that anthropogenic activities on these forests should be reduced to overcome deforestation. This work will be the baseline for new research in the study area.
Źródło:
World News of Natural Sciences; 2018, 16; 86-96
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of forming tools and process parameters on surface roughness in incremental sheet forming
Autorzy:
Khalil, Umair
Aziz, Muhammad Haris
Jahanzaib, Mirza
Ahmad, Wasim
Hussain, Salman
Hafeez, Faisal
Powiązania:
https://bibliotekanauki.pl/articles/103319.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
ISF
quantitative survey
forming tool
forming parameters
surface roughness
badanie ilościowe
narzędzia do formowania
chropowatość powierzchni
Opis:
Literature has vastly advocated for incremental sheet forming as a significant process for formation of sheet metal components, because of its higher formability in comparison with the rest of metal forming processes such as deep drawing and stamping. Due to high formability of incremental sheet forming it becomes important to investigate the main factors, influencing the quality of forming products. However, less attention has been given to investigate the inconsistencies reflected often in determining the effect of multiple forming parameters and parametric interactions comprising of spindle rotational speed and feed rate, tool size and sheet thickness, sheet thickness and step depth. This study investigates the effect of various principal factors including tool type, tool size, sheet thickness, spindle speed, feed rate, step increment including and their respective interaction on surface roughness. Research data was collected by undertaking extensive literature review of previous studies on incremental sheet forming regarding surface quality. A quantitative one way analysis of variance (ANOVA) was employed to analyze the significance and contribution of factors influencing surface quality of sheet forming. The findings highlight the contribution of forming parameters and their combined interactions on surface roughness. Based on the empirical findings, this study derives implications for the optimization of tool type, parametric interactions among principal factors and their respective optimized operational range for incremental sheet forming.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 3; 75-95
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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