Autor: Wahyudi, Wahyudi - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Physical and chemical mechanisms of hydrophobicity of nanoparticle membranes (Mg+Al2O3)
Autorzy:: Wahyudi, Wahyudi
Subagyo, R.
Gapsari, F.
Powiązania:: https://bibliotekanauki.pl/articles/368531.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: hydrophobic
superhydrophobic
hydrophilic
SEM-EDX
gas bubbles
nanoparticles
membranes
hydrofobowość
superhydrofobowość
hydrofilowość
pęcherze gazowe
nanocząstki
membrany
Opis:: Purpose: Investigate the hydrophobic, superhydrophobic and hydrophilic properties of Alumina (Al2O3) and Magnesium (Mg) nanoparticles. Design/methodology/approach: This research was conducted by SEM-EDX analysis of Magnesium and Alumina nanoparticles, observation of gas bubbles when droplets of water contact with membrane surfaces, measurement of surface roughness and detection of Hydrogen gas production using Gas Chromatography. There are eleven compositions (Al2O3:Mg) membranes used in this study, namely: (0:100; 10:90; 20:80; 30:70; 40:60; 50:50; 60:40; 70:30; 80:20; 90:10; and 100:0). Findings: Successfully found an alloy membrane between Alumina (Al2O3) and Magnesium (Mg) nanoparticles in the composition of Mg:Al2O3 (0:100%) having Hydrophobic properties; Mg:Al2O3 (50:50%) has Superhydrophobic properties and Mg:Al2O3 (100:0%) has hydrophilic properties. Three conditions occur when H2O droplets come in contact with the membrane layer, namely: hydrophobic conditions when the trapped gas pressure is smaller than the droplet pressure. Superhydrophobic conditions when the trapped gas pressure is equal to the droplet pressure. Hydrophilic conditions occur when the trapped gas pressure is greater than the droplet pressure. Research limitations/implications: This research is limited to the hydrophobic nature of Nano Alumina (Al2O3) and Magnesium (Mg) membrane particles. Practical implications: Superhydrophobic properties are very suitable to be applied to membranes that are useful for destiny. Originality/value: The novelty of this study is to find the right mixture of nanoparticles of Alumina and Magnesium in a composition that is capable of creating hydrophobic, superhydrophobic and hydrophilic properties.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2019, 96, 2; 57-68
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Technology Transfers and Knowledge Management in Developing Economies: Case Study of an Indonesian Manufacturer
Autorzy:: Wibowo, Wahyudi
Powiązania:: https://bibliotekanauki.pl/articles/1202473.pdf
Data publikacji:: 2013
Wydawca:: Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Tematy:: technology transfers
technological capabilities
reseach and development
knowledge management
developing economies
Opis:: International technology transfers are crucial for developing economies since they may operate as one of the key drivers in the economies’ development path. Previous studies have acknowleged some channels of technology transfers for developing economies. Nevertheless, the precise mechanisms of how the technology transfers would occur and take effect in each of the recipient economies and their domestic companies are still to be explored. Furthermore, understanding domestic companies knowledge management is important since it would determine the absorptive capacity of the company toward advanced foreign technologies. This study uses a case of technologically intermediate-level Indonesian manufacturer to show evidence of international technology transfers and their impacts on the development of indigenous technological capabilities of the domestic company, as well as to examine the company’s knowledge management. This study confirmed some benefits of international technology transfers for the domestic company, especially through the major mechanisms of technical license assistances, capital goods imports, turnkey projects, technical consultancies, backward-vertical flows of foreign direct investment, and participation in overseas markets. However, the impacts toward the domestic company’s technological capabilities were generally at intermediate level. This implies that the domestic company needs to spend more investments on in-house R&D activities and to improve its knowledge management systems.
Źródło:: Journal of Entrepreneurship, Management and Innovation; 2013, 9, 4; 5-28
2299-7075
2299-7326
Pojawia się w:: Journal of Entrepreneurship, Management and Innovation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Simulation of Pipe Networks Using EPANET to Optimize Water Supply : a Case Study for Arjawinangun Area, Indonesia
Autorzy:: Safitri, Adam
Wahyudi, Slamet Imam
Soedarsono
Powiązania:: https://bibliotekanauki.pl/articles/31340458.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: drinking water
EPANET 2.0
hydraulic simulation
optimization
pipeline Network
Opis:: In providing clean water services to a community, a clean water supply distribution network system is very important. This study is aimed at the determination of the distribution pipe network by simulating and optimizing the water supply system in the Arjawinangun area, Cirebon, West Java, Indonesia. The data collected was analyzed by using EPANET 2.0 software for modelling water distribution systems. The results show that the total domestic and non-domestic water demand is 391.41 l/s, with a leakage rate of 20%. The pipeline installation plan for the Arjawinangun area is planned to be installed for a length of 23,045 m, with pipe diameters ranging from 400 to 90 mm. The Arjawinangun Area Offtake Reservoir drainage system, which is at an elevation of +25 m above sea level, requires a distribution pump with a head (H) of 6.0 bar. Also, using the gravity distribution technique, a water tower can be built (~ 55 m) as a water supply booster pump.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2023, 70, 1; 17-28
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Coal Dust Exposure Characteristic and Impact on Respiratory Impairment from Coal Unloading Station in Palembang, South Sumatra, Indonesia
Autorzy:: Wahyudi, Arie
Zulkifli, Hilda
Arita, Susila
Sitorus, Rico Januar
Powiązania:: https://bibliotekanauki.pl/articles/2173219.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: coal dust
particulate matter
coal transportation
respiratory disorders
Opis:: Coal hauling, loading, and transportation activities impacted the emergence of coal dust which is harmful to health. The coal dust exposed from coal unloading stations and coal waterway transportation has escaped attention. This study aimed to determine the characteristics of coal dust, the influence of climate parameters on the spread of coal dust, and its impact on the health of children under five in the exposed area. The coal dust characteristics and concentrations of PM PM2.5 and PM10 were analyzed from ten points spread across three mining companies (A, B, and C). The effect of climate parameters on PM2.5 and PM10 was tested statistically. The results of the chemical analysis revealed that coal dust was dominated by the high content of Si, Al, S, and Fe. The concentration of PM2.5 and PM10 is affected by wind speed. PM2.5 and PM10 can exceed the annual threshold value, which has caused a high incidence of respiratory problems in two sub-districts, namely Makrayu and Gandus.
Źródło:: Journal of Ecological Engineering; 2022, 23, 7; 113--120
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Sensory Characteristics and Consumer Liking of Basil Syrups (Ocimum basilicum L.) in Different Sensory Settings
Autorzy:: Ervina, Ervina
Bryant, Kyle
Nur Fibri, Dwi Larasatie
David, Wahyudi
Powiązania:: https://bibliotekanauki.pl/articles/16538551.pdf
Data publikacji:: 2023-08-02
Wydawca:: Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:: blind test
check-all-that-apply
informed test
consumer perception
Opis:: The objective of this study was to investigate the sensory profiles of basil syrups formulated with different contents of basil leaf extract and sugar, and to determine the key attributes of consumer liking. Moreover, this study also measured consumers’ perceptions in two sensory evaluation settings of blind and non-blind (informed) tests. Sixty adult consumers were involved in the evaluation. The basil leaf extract and sugar contents influenced the sensorial characteristic of basil syrups. Moreover, consumers had different perceptions and changed their preferences for this product in different sensory evaluation settings. Information related to ingredients and sugar contents was demonstrated to consumers to enable the shift in their preferences. Consumers perceived the basil syrups as significantly healthier in the non-blind setting (p<0.001) compared to the blind test (p=0.110). Moreover, the liking showed to be significantly higher in the non-blind setting compared to the blind test (p=0.050), especially for the sugar-free samples. This research could be used as a preliminary study to further develop functional drinks made from basil leaves and to consider the information regarding food ingredients provided to consumers.
Źródło:: Polish Journal of Food and Nutrition Sciences; 2023, 73, 3; 233-241
1230-0322
2083-6007
Pojawia się w:: Polish Journal of Food and Nutrition Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Damping-off disease reduction using actinomycetes that produce antifungal compounds with beneficial traits
Autorzy:: Fatmawati, U.
Meryandini, A.
Nawangsih, A.A.
Wahyudi, A.T.
Powiązania:: https://bibliotekanauki.pl/articles/2082741.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: antifungal activity
disease suppression
in planta
Streptomyces
root rot
Opis:: Actinomycetes are considered to be the biggest producer of bioactive compounds which are expected to have antifungal activity for controlling many fungi such as Rhizoctonia solani. The objective of this study was to obtain potential soybean rhizosphere actinomyc- etes as a biocontrol agent for R. solani which cause damping-off disease both in vitro and in vivo, including their ability to produce siderophore, chitinase, and HCN. Out of 26 isolates, 18 (56%) showed diverse antifungal activities against R. solani with percentages of inhibi- tion radial growth (PIRG) from 18.9 to 64.8%, as evaluated by a dual culture method. Ten isolates with the strongest antifungal activity were numbered for further characterization. All the tested isolates were not antagonistic towards Bradyrhizobium japonicum. These iso- lates were able to suppress damping-off disease caused by R. solani in the greenhouse exper- iment. Isolate ASR53 showed the highest disease suppression, 68% and 91% in sterile and non-sterile soil, respectively. Based on 16S rRNA sequence analysis this isolate belonged to Streptomyces violaceorubidus LMG 20319 (similarity 98.8%) according to GenBank data base available at www.ncbi.nlm.gov.nih. Furthermore, isolate ASR53 had significantly longer roots and shoots, as well as greater fresh and dry weights of seedlings than the con- trol. Crude extract derived from ASR53 isolates contained 10 dominant compounds that were biologically active against fungal pathogens. Thus, this study suggests that the applica- tion of potential actinomycetes of the soybean rhizosphere can act as a promising biocon- trol agent against damping-off disease caused by R. solani.
Źródło:: Journal of Plant Protection Research; 2020, 60, 3; 233-243
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Construction of Seabed Structures by New Development Covering Material Using Fly Ash
Konstrukcja struktur dna morza za pomocą nowych materiałów pokrywających z użyciem popiołów lotnych
Autorzy:: Shimada, H.
Sasaoka, T.
Fujita, S.
Wahyudi, S.
Yoshida, Y.
Powiązania:: https://bibliotekanauki.pl/articles/318975.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Przeróbki Kopalin
Tematy:: popiół lotny
materiał wprowadzany
struktura dna morskiego
fly ash
surfactant
injection material
seabed structure
Opis:: In recent years, many seabed structure materials are needed for extraction of methane hydrate and submarine hydrothermal polymetallic ore in Japan. Although covering material is required to make the protection disturbance for environmental issues at seabed, it has high mobility, and does not bleed, etc. after construction. Therefore, a construction material which uses a material mixture of the surface-active agent with fly ash was developed. Usage of fly ash instead of cement leads to improved mobility, reduced construction cost and so on. In considering these points, in order to clarify to what degree the contents of surfactant affects the properties of the injected fly ash mixture into the construction of seabed structures, different combinations of fly ash, surfactant and water were considered by means of multiple experiments.
W ostatnich latach istnieje potrzeba obecności wielu materiałów w strukturze dna morza aby możliwe było wydobycie uwodnionego metanu oraz hydrotermalnych podwodnych złóż polimetalicznych w Japonii. Materiał okładziny jest potrzebny aby ochraniać środowisko naturalne dna morza, posiada on dużą mobilność oraz nie odpowietrza się po zainstalowaniu. Wynaleziono materiał konstrukcyjny, który składa się z mieszaniny odczynnika powierzchniowo-czynnego z popiołem lotnym. Zastosowanie popiołu lotnego zamiast cementu prowadzi do lepszej mobilności, redukcji kosztów instalacji itp. Mając na względzie te cechy, aby stwierdzić w jakim stopniu zawartość surfaktanta wpływa na właściwości wprowadzonej mieszaniny popiołu lotnego do konstrukcji struktury dna morskiego zastosowano różne kombinacje popiołu lotnego, surfaktanta i wody. W tym celu przeprowadzono wiele eksperymentów.
Źródło:: Inżynieria Mineralna; 2016, R. 17, nr 1, 1; 143-151
1640-4920
Pojawia się w:: Inżynieria Mineralna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Antifungal activities of bacteria producing bioactive compounds isolated from rice phyllosphere against Pyricularia oryzae
Autorzy:: Wiraswati, M.N.
Rusmana, I.
Nawangsih, A.A.
Wahyudi, A.T.
Powiązania:: https://bibliotekanauki.pl/articles/65341.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:: Rice blast is the main disease of rice plants in Indonesia and several countries worldwide. Controlling this disease using chemical fungicides has harmful effects on the environment. Therefore, we need biocontrol agents which are more environmentally friendly such as rice phyllosphere bacteria. This study aimed to explore bacteria producing bioactive compounds from the rice phyllosphere environment to control blast disease. A total of 88 isolates were successfully isolated from rice leaves in Sukabumi, Situgede, and Jasinga (West Java, Indonesia). From them, we obtained 22 bacteria isolates with antifungal activity against Pyricularia oryzae in vitro assay. In addition, seven non-pathogenic bacteria were obtained from further screening in hypersensitivity, hemolysis and pathogenicity assays, namely STGG 3, STGG 7, STGG 8, STGG 14, SKBV 1, STGV 8, and SKBG 78. To show their antifungal activity, we tested crude extracts of these seven isolates and the results revealed that all the crude extracts can inhibit the growth of P. oryzae. Based on a genetic approach, isolates STGG 3, STGG 7, and STGG 14 were found to have both nonribosomal peptide synthetases (NRPS) and polyketide synthases (PKS) genes, while isolate SKBV 1 only had the NRPS gene. The NRPS and PKS genes from potential isolates were similar to NRPS and PKS genes of Bacillus sp. in different strains. Furthermore, molecular identification based on the 16S rRNA gene revealed that the seven potential isolates belong to three genera, i.e. Bacillus (STGG 3, STGG 7, STGG 8, STGG 14, SKBV 1), Enterobacter (STGV 8) and Brachybacterium (SKBG 78). We suggest that the seven isolates found in this study have potency and could be recommended as biocontrol agents of blast disease caused by P. oryzae.
Źródło:: Journal of Plant Protection Research; 2019, 59, 1
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Kinetics of Pollutants Removal in Wetlands Influenced by Retention Time and Number of Plants Using Cyperus alternifolius
Autorzy:: Rahman, Danar Arifka
Priambodo, Eka Wahyudi
Caturputranto, Trisnadi Widyaleksono
Wahyudianto, Febri Eko
Powiązania:: https://bibliotekanauki.pl/articles/2202280.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: constructed wetland
Cyperus alternifolius
kinetics
wastewater treatment
Opis:: Constructed wetland is considered an alternative for domestic wastewater treatment in cities. This study serves to evaluate the removal capacity and kinetics of TSS, COD, phosphate, and surfactant in domestic wastewater with several plants of Cyperus alternifolius, through the use of the constructed wetlands treatment. The overall objective of the study was to determine the ability of Cyperus alternifolius to remove water pollutants in domestic wastewater in several plants. The domestic wastewater was contacted in a batch system. The results indicated that CWs had a good performance on COD, phosphate, and surfactant with removal efficiencies of more than 80%, with a retention time of 8 days and 5 plants. However, the removal of suspended solids was found limited, as shown that the TSS removal efficiency was under 40%. The first-order equation of kinetics described the degradation of pollutants. The q1/2 values, which were defined as the average removal loading prior to the half of the pollutant concentration being removed and represented the removal capacity without limitation of pollutants concentration, were moderately increased with an addition to the number of plants.
Źródło:: Journal of Ecological Engineering; 2022, 23, 12; 37--43
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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