ENGLISH GRADUATE STUDENT’S PERCEPTION ABOUT THE EFFECTIVENESS OF ONLINE LEARNING TUTOR IN DISTANCE EDUCATION

One of the successes of a learning program is obtained by the various feedbacks during the evaluation process, including when the program is implemented in the form of distance learning. The purpose of this study was to examine the perception of graduate students in English Education department about the effectiveness of distance learning carried out by the tutors during the learning process. Descriptive quantitative method was used in this study to answer the objectives of this study. A total of 21 students of master's degree in English Education department were involved in this study by selecting the respondents using the purposive sampling technique. The researchers used the measurement with reference to Kirkpatrick's model which explains the effectiveness of online learning through the aspects of reaction, learning, behavior and results. The result showed that the majority of respondents were satisfied with the learning process provided by the tutor as seen from the satisfaction score that reached more than 75% for each aspect. Meanwhile, other results also showed that the four aspects which were the manifestation of the effectiveness of a tutor's learning have a strong and significant relationship in supporting the performance of a tutor. This study emphasized the importance of elaboration of every aspect that must be possessed by the tutors in carrying out online learning

The efficacy of Virkon-S for the control of saprolegniasis in common carp, Cyprinus carpio L

Background Saprolegnia parasitica is a fish pathogen that causes severe economic losses worldwide. Virkon-S is a well-known disinfectant known to exhibit antimicrobial activities against bacteria, viruses, and fungi. In this study, we tested the anti-fungal activity of Virkon-S against S. parasitica, the major causal agent of saprolegniasis. Methods The lowest concentration of Virkon-S that prevented germination or the visible growth of spores and the percent spore germination were determined using potato dextrose agar plates containing different concentrations of Virkon-S. The cytotoxic effect was evaluated using the Ez-Cytox Cell Viability Assay with epithelioma papulosum cyprini (EPC) cells grown in L-15 medium and acute toxicity tests were carried out with cultured fingerlings of common carp for 96 h. Artificial infection with S. parasitica was performed by placing the fish in tanks containing zoospores of S. parasitica after descaling and wounding at three positions. The diseased fish were kept in tanks containing 2, 4, and 10 ppm of Virkon-S for 10 days to observe the treatment effect. Results The in vitro assay results showed that Virkon-S could inhibit spore germination and the resulting mycelial growth at a concentration as low as 4 ppm. No cytotoxic effect on EPC cells was observed even at a concentration as high as 100 ppm. Additionally, no acute toxicity in the common carp was observed at 10 ppm following 96 h exposure. Ten days of treatment with 4 and 10 ppm Virkon-S resulted in complete reversal of artificially-induced saprolegniasis in the common carp. Discussion This data indicates that Virkon-S can be used for the control of saprolegniasis without harmful effects in fish. However, further research on the effect in humans and food supplies is necessary

A high speed current dq PI controller for PMSM drive

Rješenje PI regulatora struje dq utemeljeno na Field Programmable Gate Array (FPGA) predlaže se u ovom istraživanju, a obično se provodi na računalu s procesorom digitalnog signala (DSP). Glavni problem kod DSP temeljenog rješenja je vrijeme izvršenja, koje je obično u rasponu od mikrosekundi, kao i dostizanju njegovih fizičkih granica. Stoga, dovršavanje izvršenja unutar nanosekundi postaje veliki izazov za sve istraživača, što može biti učinjeno smanjenjem ciklusa sata. Uvođenje ukupnog kontrolnog algoritma u FPGA sigurno će dramatično smanjiti vrijeme izvršenja kao zalog za postojanost motora. Rezultat pokazuje da predložena FPGA izvedba treba samo 68 ns korištenog vremena za operativnu frekvenciju od 30 MHz i točnost od 99,9 %, što je najniži računalni ciklus ovoga doba.A Field Programmable Gate Array (FPGA) based solution of current dq PI controller is proposed in this research, which is usually implemented in digital signal processor (DSP) based computer. The main problem in DSP based solution is the execution time, which is usually in microseconds range as well as reaching its physical limits. Therefore, completing the execution within nanoseconds becomes a major challenge to all researchers, which can be done by reducing the clock cycles. Implementing the overall controlling algorithm into FPGA will certainly reduce the execution time dramatically to pledge the steadiness of the motor. The result shows that the proposed FPGA performance requires only 68 ns of execution time for operating frequency of 30 MHz and accuracy of 99,9 %, which is the lowest computational cycle for the era

ZnO nanopowder derived from brass ash: Sintering behavior and mechanical properties

The present investigation studied the recycling of zinc from brass ash which is a secondary product produced during the brass smelting process. A retiring cycle was devised to produce high-purity ZnO nanopowders. Recovery of > 90 wt% of the total zinc available was achieved after the calcination of brass ash at 700 °C and a multistage hydrometallurgical treatment at room temperature. ZnO powder produced by the developed method was analyzed by X-ray diffraction, transmission electron scanning microscopy, ICP-AES and BET analysis. The ZnO nanopowder obtained from the brass ash was well dispersed and the size of the individual particles was in the range of 30–50 nm. The purity of the powder was 99.83 wt%, and the surface area was about 30.5 m2/g. A relative density level of about 98.1% was reached with ZnO pellets sintered at 1300 °C

Nanotechnology and Nanotoxicology in Retinopathy

Nanoparticles are nanometer-scaled particles, and can be utilized in the form of nanocapsules, nanoconjugates, or nanoparticles themselves for the treatment of retinopathy, including angiogensis-related blindness, retinal degeneration, and uveitis. They are thought to improve the bioavailability in the retina and the permeability of therapeutic molecules across the barriers of the eye, such as the cornea, conjunctiva, and especially, blood-retinal barriers (BRBs). However, consisting of multiple neuronal cells, the retina can be the target of neuronal toxicity of nanoparticles, in common with the central and peripheral nervous system. Furthermore, the ability of nanoparticles to pass through the BRBs might increase the possibility of toxicity, simultaneously promoting distribution in the retinal layers. In this regard, we discussed nanotechnology and nanotoxicology in the treatment of retinopathy

Treatment Guidance for Patients With Lung Cancer During the Coronavirus 2019 Pandemic

The global coronavirus disease 2019 pandemic continues to escalate at a rapid pace inundating medical facilities and creating substantial challenges globally. The risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in patients with cancer seems to be higher, especially as they are more likely to present with an immunocompromised condition, either from cancer itself or from the treatments they receive. A major consideration in the delivery of cancer care during the pandemic is to balance the risk of patient exposure and infection with the need to provide effective cancer treatment. Many aspects of the SARS-CoV-2 infection currently remain poorly characterized and even less is known about the course of infection in the context of a patient with cancer. As SARS-CoV-2 is highly contagious, the risk of infection directly affects the cancer patient being treated, other cancer patients in close proximity, and health care providers. Infection at any level for patients or providers can cause considerable disruption to even the most effective treatment plans. Lung cancer patients, especially those with reduced lung function and cardiopulmonary comorbidities are more likely to have increased risk and mortality from coronavirus disease 2019 as one of its common manifestations is as an acute respiratory illness. The purpose of this manuscript is to present a practical multidisciplinary and international overview to assist in treatment for lung cancer patients during this pandemic, with the caveat that evidence is lacking in many areas. It is expected that firmer recommendations can be developed as more evidence becomes available

The interactive effects of arbuscular mycorrhiza and plant growth-promoting rhizobacteria synergistically enhance host plant defences against pathogens

Belowground interactions between plant roots, mycorrhizal fungi and plant growth-promoting rhizobacteria (PGPR) can improve plant health via enhanced nutrient acquisition and priming of the plant immune system. Two wheat cultivars differing in their ability to form mycorrhiza were (co)inoculated with the mycorrhizal fungus Rhizophagus irregularis and the rhizobacterial strain Pseudomonas putida KT2440. The cultivar with high mycorrhizal compatibility supported higher levels of rhizobacterial colonization than the low compatibility cultivar. Those levels were augmented by mycorrhizal infection. Conversely, rhizobacterial colonization of the low compatibility cultivar was reduced by mycorrhizal arbuscule formation. Single inoculations with R. irregularis or P. putida had differential growth effects on both cultivars. Furthermore, while both cultivars developed systemic priming of chitosan-induced callose after single inoculations with R. irregularis or P. putida, only the cultivar with high mycorrhizal compatibility showed a synergistic increase in callose responsiveness following co-inoculation with both microbes. Our results show that multilateral interactions between roots, mycorrhizal fungi and PGPR can have synergistic effects on growth and systemic priming of wheat