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Wyświetlanie 1-9 z 9
Tytuł:
Experimental study on sedimentation removal of pervious concrete
Eksperymentalne badanie dotyczące usuwania betonu jamistego na drodze sedymentacji
Autorzy:
Rama, M.
Shanthi, V. M.
Tematy:
beton jamisty
kolmatacja
usuwanie osadu
przepuszczalność
sedymentacja
woda burzowa
pervious concrete
clogging
sediments removal
permeability
sedimentation
storm water
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/230935.pdf  Link otwiera się w nowym oknie
Opis:
Pervious concrete is a unique and effective material used to tackle important environmental problems, to maintain green, sustainable growth, and to reduce storm water runoff and pollutants. Clogging of pervious concrete is an important potential issue in serviceability, considered one of the primary limitations of pervious concrete systems. The sediment deposition pattern of pervious concrete was determined using three clogging materials: clay, sand, and clayey silty sand. The clogged specimens were cleaned by pressure washing, vacuuming, and a combined method. In total, ten clogging and cleaning cycles were carried out on each sample to evaluate the draining capacity of the pervious concrete. The clogging test was assessed by measuring the infiltration rate during clogging and after cleaning, for each cycle. The experiment results showed that a reduction in permeability due to different types of sedimentation material as well as recovery in permeability was achieved after applying various cleaning methods.
Urbanizacja stwarza liczne problemy, takie jak erozja, gwałtowne powodzie, zanieczyszczenie rzek oraz efekt wyspy ciepła. Beton jamisty jest przyjaznym dla środowiska materiałem nawierzchniowym, który częściowo ogranicza wyżej wspomniane problemy, a także służy zachowaniu środowiska naturalnego, zmniejszając spływ wody burzowej, zanieczyszczenia oraz miejskie ciepło. Beton jamisty jest podobny do zwykłego betonu, z wyjątkiem dodatku drobnego kruszywa, które tworzy połączone ze sobą puste przestrzenie umożliwiające przepływ wody przez betonową matrycę. Pustki od 15% do 35% całkowitej objętości betonu jamistego są utrzymywane za pomocą gruboziarnistego kruszywa o ciągłej krzywej przesiewu i gęstego cementu, który zapobiega oddzielaniu się pasty od kruszywa. Wydajność hydrauliczna betonu jamistego dla odprowadzenia wody burzowej zależy od szybkości odkładania się osadu w odniesieniu do okresu czasu. Kolmatacja betonu jamistego stanowi istotny potencjalny problem w zakresie użytkowalności, który jest uważany za jedno z podstawowych ograniczeń w systemach betonu jamistego. Kolmatacja odnosi się do zmniejszenia przepuszczalności porowatego ośrodka ze względu na proces fizyczny, chemiczny i biologiczny. Głównymi źródłami kolmatacji są zawieszone cząstki z powierzchniowych wód spływających, a także organiczne i nieorganiczne cząstki pochodzące z ruchu drogowego i miejscowej roślinności lub pyłu wydmuchiwanego na jezdni. Niniejsze badanie koncentruje się na wydajności hydraulicznej systemu betonu jamistego poprzez wywoływanie kolmatacji przy użyciu różnych materiałów sedymentacyjnych i ocenie zdolności infiltracji betonu jamistego. Prace eksperymentalne przeprowadzono, aby zrozumieć przydatność metod renowacyjnych w przywracaniu wydajności hydraulicznej betonu jamistego. Celem tego badania jest ocena efektu kolmatacji betonu jamistego w oparciu o trzy różne materiały sedymentacyjne, trzy różne stopnie uziarnienia kruszywa i trzy metody renowacji. Służy to określeniu zmniejszenia przepuszczalności po kolmatacji i resztkowej przepuszczalności po oczyszczeniu próbek betonu jamistego.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hardness Curves for 31CrMoV9 Steel after Gas Nitriding
Autorzy:
Syla, N.
Aliaj, F.
Rama, M.
Tematy:
gas nitriding
hardness curve
nitriding potential
31CrMoV9 steel
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1031477.pdf  Link otwiera się w nowym oknie
Opis:
This work is an experimental study of the hardness curve in the zone of diffusion for the gas nitriding process of 31CrMoV9 steel. 12 samples were subjected to gas nitriding at three different temperatures - 510°C, 550°C, and 590°C - and for each temperature four different nitriding times were used. Hardness was measured with an automatic microhardness tester PCE from LECO with a load of HV0.1 (0.9807N), and the distance between the points was 50 μm. It was found that the hardness of the diffusion layer changed from 602 HV to 787 HV. The maximum surface hardness was found at 510°C after nitriding for 16 h. Depending on the process parameters, the depth of the diffusion layer ranged from 270 μm to 700 μm. From the results we can draw conclusions for the gradient curve of nitriding parameters, and from each curve we can find the depth of the diffusion of nitrogen in steel.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent lattices
Autorzy:
Sambasiva Rao, M.
Siva Rama Raju, S. V.
Tematy:
Coherent lattice
generalized Stone lattice
Boolean algebra
quasi-complemented lattice
normal lattice
Pokaż więcej
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:
https://bibliotekanauki.pl/articles/59467134.pdf  Link otwiera się w nowym oknie
Opis:
The notion of coherent lattices is introduced and established relations between a coherent lattice and that of a generalized Stone lattice, Boolean algebra, quasi-complemented lattice, and normal lattice. A set of equivalent conditions is given for every sublattice of a lattice to become a coherent lattice. Some equivalent conditions are given for every interval of a lattice to become a coherent sublattice. Coherent lattices are characterized with the help of certain properties of filters and dense elements.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of EMD ANN and DNN for Self-Aligning Bearing Fault Diagnosis
Autorzy:
Narendiranath, B. T.
Aravind, A.
Rakesh, A.
Jahzan, M.
Rama, P. D.
Tematy:
self-aligning bearing
fault classification
artificial neural networks
deep neural networks
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/176889.pdf  Link otwiera się w nowym oknie
Opis:
Self-aligning roller bearings are an integral part of the industrial machinery. The proper analysis and prediction of the various faults that may happen to the bearing beforehand contributes to an increase in the working life of the bearing. This study aims at developing a novel method for the analysis of the various faults in self-aligning bearings as well as the automatic classification of faults using artificial neural network (ANN) and deep neural network (DNN). The vibration data is collected for six different faults as well as for the healthy bearing. Empirical mode decomposition (EMD) followed by Hilbert Huang transform is used to extract instantaneous frequency peaks which are used for fault analysis. Time domain and time-frequency domain features are then extracted which are used to implement the neural networks through the pattern recognition tool in MATLAB. A comparative study of the outputs from the two neural networks is also performed. From the confusion matrix, the efficiency of the ANN has been found to be 95.7% and using DNN has been found to be 100%.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of different cropping conditions, depth of burial, age of seeds, and allelopathic effect of different crops on the germi-nation behavior of little seed canary grass (Phalaris minor Retz.) seeds
Autorzy:
Prabhakar, Sivapuram Venkata Rama Krishna
Yaduraju, N. T.
Dadlani, Malavika
Gopal, M.
Tematy:
allelopathic effect
anaerobic conditions
crop residues
depth of burial
germination
membrane permeability
rice-wheat cropping system
Pokaż więcej
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Powiązania:
https://bibliotekanauki.pl/articles/55928341.pdf  Link otwiera się w nowym oknie
Opis:
Pot culture experiments were conducted to find out the effect of different cropping conditions, depth of burial and age of seeds on the survival of little seed canary grass (Phalaris minor Retz.) seeds. The results indicated that the soil temperature modifications through the flooding or filed capacity moisture status of the soil influenced the germination and viability of the buried weed seeds rather than the crops per se. It was observed that the seeds lost their viability because of the anaerobic conditions and high temperatures and through increased membrane permeability of the seeds. The P. minor Retz. seeds were found to be sensitive to anaerobic conditions. The longevity of seeds buried in rice-wheat system and Flooding-wheat system was found low when compared to those buried under soybean-wheat and field capacity-wheat conditions. The in situ effect of rainy season (kharif) crops was found to confine to influencing the initial germination (vigor) of the little seed canary grass with cowpea, groundnut, soybean and sunflower inhibiting the initial germination of little seed canary grass. This inhibition was absent at the end of germination counts taken after twenty days after keeping for germination. The residual effect of cowpea, rice, soybean and sunflower was observed. The application of pearl millet and rice residues has considerably reduced the little seed canary grass germination, plant height, seedling fresh weight and leaf area at thirty days after sowing.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of different cropping conditions, depth of burial, age of seeds, and allelopathic effect of different crops on the germi-nation behavior of little seed canary grass (Phalaris minor Retz.) seeds
Autorzy:
Prabhakar, Sivapuram Venkata Rama Krishna
Yaduraju, N. T.
Dadlani, Malavika
Gopal, M.
Tematy:
allelopathic effect
anaerobic conditions
crop residues
depth of burial
germination
membrane permeability
rice-wheat cropping system
Pokaż więcej
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Powiązania:
https://bibliotekanauki.pl/articles/2199653.pdf  Link otwiera się w nowym oknie
Opis:
Pot culture experiments were conducted to find out the effect of different cropping conditions, depth of burial and age of seeds on the survival of little seed canary grass (Phalaris minor Retz.) seeds. The results indicated that the soil temperature modifications through the flooding or filed capacity moisture status of the soil influenced the germination and viability of the buried weed seeds rather than the crops per se. It was observed that the seeds lost their viability because of the anaerobic conditions and high temperatures and through increased membrane permeability of the seeds. The P. minor Retz. seeds were found to be sensitive to anaerobic conditions. The longevity of seeds buried in rice-wheat system and Flooding-wheat system was found low when compared to those buried under soybean-wheat and field capacity-wheat conditions. The in situ effect of rainy season (kharif) crops was found to confine to influencing the initial germination (vigor) of the little seed canary grass with cowpea, groundnut, soybean and sunflower inhibiting the initial germination of little seed canary grass. This inhibition was absent at the end of germination counts taken after twenty days after keeping for germination. The residual effect of cowpea, rice, soybean and sunflower was observed. The application of pearl millet and rice residues has considerably reduced the little seed canary grass germination, plant height, seedling fresh weight and leaf area at thirty days after sowing.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic Fault Classification for Journal Bearings Using ANN and DNN
Autorzy:
Narendiranath Babu, T.
Aravind, A.
Rakesh, A.
Jahzan, M.
Rama Prabha, D.
Ramalinga Viswanathan, M.
Tematy:
journal bearing
fault classification
artificial neural networks
deep neural networks
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/177579.pdf  Link otwiera się w nowym oknie
Opis:
Journal bearings are the most common type of bearings in which a shaft freely rotates in a metallic sleeve. They find a lot of applications in industry, especially where extremely high loads are involved. Proper analysis of the various bearing faults and predicting the modes of failure beforehand are Essentials to increase the working life of the bearing. In the current study, the vibration data of a journal Bering in the healthy condition and in five different fault conditions are collected. A feature extraction metod is employed to classify the different fault conditions. Automatic fault classification is performed using artificial neural networks (ANN). As the probability of a correct prediction goes down for a higher number of faults in ANN, the method is made more robust by incorporating deep neural networks (DNN) with the help of autoencoders. Training was done using the scaled conjugate gradient algorithm and the performance was calculated by the cross entropy method. Due to the increased number of hidden layers in DNN, it is possible to achieve a high efficiency of 100% with the feature extraction method.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydroponics agriculture as a modern agriculture technique
Autorzy:
Monisha, K.
Kalai Selvi, H.
Sivanandhini, P.
Sona Nachammai, A.
Anuradha, C. T.
Rama Devi, S.
Kavitha Sri, A.
Neya, N. R.
Vaitheeswari, M.
Hikku, G. S.
Tematy:
hydroponics
agriculture
hoagland solution
macronutrients
micronutrients
types of hydroponic system
hydroponika
rolnictwo
makroskładniki
mikroskładniki
Pokaż więcej
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:
https://bibliotekanauki.pl/articles/24200644.pdf  Link otwiera się w nowym oknie
Opis:
Purpose Hydroponics, also known as controlled environment agriculture, is a method of cultivating plants and herbs without soil using mineral-supplemented solutions. Agriculture biotechnology enhances its wings on developing genetically modified plants for expanding crop yield and introducing characteristic features such as growing seasonal crops throughout the year, weather-resistant, and pest resistance. Compared to traditional agriculture, hydroponic cultivation yields high-quality crops with 90% more efficient use of water. Therefore, hydroponic cultivation could be considered a succeeding future of agriculture. In this context, understanding agriculture through the hydroponic route is vital for the efficient cultivation of crops. This review elaborates on the different classes of hydroponic systems and the factors that enable the systematic elements of the frame-up. Design/methodology/approach The significant intent of this review is to provide information on distinct hydroponic systems. Findings The present review reports a comprehensive discussion about the significance of the hydroponics system, its mechanism, nutrient solution preparation, types of hydroponic setup, and the challenges faced and would light up the knowledge in the same. Originality/value This review focus on the current feasible hydroponic method of crop cultivation.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrolyte ions-matching hierarchically porous biochar electrodes with an extended potential window for next-generation supercapacitors
Autorzy:
Kondrat, Svyatoslav
Long, Teng
Hwang, Seung-Kyu
Kugalur Shanmugam, Ranjith
Chodankar, Nilesh R.
Basaveswara Rao, M. V.
Wu, Peng
Roh, Kwang Chul
Lee, Jeong Han
Pavitra, Eluri
Han, Young-Kyu
Raju, Ganji Seeta Rama
Patil, Swati J.
Huh, Yun Suk
Wydawca:
Royal Society of Chemistry
Cytata wydawnicza:
J. Mater. Chem. A, 2023, 11, 15540-15552
Opis:
Engineering high-performance carbonaceous electrode materials from earth-abundant biomass has attracted substantial attention for its applicability in next-generation supercapacitors (SCs). However, these materials exhibit low specific energy due to the dominance of mesopores and a limited potential window. To overcome these shortcomings, herein, we synthesize Miscanthus sinensis (silver grass)-derived hierarchically-porous activated carbons (SHACs) via pyrolysis, carbonization, and KOH activation. We test the SHAC electrodes with different electrolytes, showing how an electrolyte–electrode pair can be tuned to boost energy and power densities. Owing to the synergetic effect of the size-balanced proportion of micropores matched with the size of electrolyte ions, in KOH electrolyte, the SHAC electrode produces a high specific capacitance (592 F g/1) while, simultaneously, providing faster charging compared to Na2SO4 electrolyte. We rationalize these findings with molecular dynamics simulations, demonstrating the avoidance of power-density trade-off, typical for microporous SCs. Upon adding K3Fe(CN)6 redox species to KOH electrolyte (hybrid electrolyte), capacitance increases 2.53 fold (380 to 963 F g/1 at 5 A g/1) due to the synergy of capacitive and faradaic energy storage mechanisms. In the hybrid electrolyte, a SHAC electrode-embedded symmetric SC (SSC) offers a high cycling stability (97%) with 1.6 V wide operational voltage and permits energy storage and power density higher than those reported so far for aqueous electrolyte-based SSCs and asymmetric SCs. In addition, these SSCs provide long-lasting operational capabilities that are useful for driving various portable electronic devices. The obtained results demonstrate a feasible methodology to utilize the maximum available surface area of carbonaceous materials for electrochemical energy storage applications.
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2021R1F1A1064174, 2021R1A5A6002853 and 2022R1A2C2008968). S. K. acknowledges the financial support by NCN grant no. 2021/40/Q/ST4/00160. This work was also supported by the Technology Innovation Program (RS-2022-00156080, Development of electrical double layer capacitors for power supplement of hydrogen forklift) funded by the Ministry of Trade, Industry and Energy, and the Natural Science Foundation of Inner Mongolia (2023SHZR1182).
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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