Wyniki wyszukiwania - Biblioteka Nauki

1

On and Off Chip Capacitor Free, Fast Response, Low Drop-out Voltage Regulator

100%

Prasad G. , Shama K.

International Journal of Electronics and Telecommunications

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2019

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tom Vol. 65, No. 2

159--165

EN

A low drop-out [LDO] voltage regulator with fast transient response which does not require capacitor for proper operation is proposed in this paper. Recent cap-less LDOs do not use off chip capacitor but instead they use on chip capacitor which occupy large area on chip. In the proposed LDO this on chip capacitor is also avoided. A novel secondary local feed-back technique is introduced which helps to achieve a good transient response even in the absence of output capacitor. Further a self compensating error amplifier is selected to eliminate the need of compensating capacitor. Stability analysis shows that the proposed LDO is stable with a phase margin of 78 0. The proposed LDO is laid out using Cadence spectre in 180 nm standard CMOS technology. Post layout simulation is carried out and LDO gives 6mV/V and 360μV /mA line and load regulation respectively. An undershoot of 120 mV is observed during the load transition from 0 mA to 50 mA with 1 μs transition time, however LDO is able to recover within 1.4μs. Since capacitor is not required in any part of design, it occupies only 0.010824 mmXmm area on chip.

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Fast UV detection and hydrogen sensing by ZnO nanorod arrays grown on a flexible Kapton tape

88%

Hassan J. J. , Mahdi M. A. , Kasim S. J. , Ahmed N. M. , Hassan H. A. , Hassan Z.

Materials Science Poland

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2013

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tom Vol. 31, No. 2

180--185

EN

ZnO nanorod arrays were grown on a flexible Kapton tape using microwave-assisted chemical bath deposition. High crystalline properties of the produced nanorods were proven by X-ray diffraction patterns and field emission scanning electron microscopy. Additionally, the photoluminescence spectrum showed higher UV peaks compared with visible peaks, which indicates that the ZnO nanorods had high quality and low number of defects. The metal-semiconductor-metal (MSM) configuration was used to fabricate UV and hydrogen gas detectors based on the ZnO nanorods grown on a flexible Kapton tape. Upon exposure to 395 nm UV light, the UV device exhibited fast response and decay times of 37 ms and 44 ms, respectively, at a bias voltage of 30 V. The relative sensitivities of the gas sensor made of the ZnO nanorod arrays, at hydrogen concentration of 2 %, at room temperature, 150 C, are 0.42, 1.4 and 1.75 respectively.

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Wpływ ćwiczeń według Emila Jaques-Dalcroz’a na kształtowanie koordynacji ruchowej u dzieci w wieku przedszkolnym

63%

Jaworska M. , Wnuk B. , Durmała J. , Kolebacz M.

Annales Academiae Medicae Silesiensis

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2011

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tom 65

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nr 1-2

13-19

EN

BACKGROUND The main goal of the research program was to evaluate the infl uence of Emile Jaques-Dalcroze method on the formation of coordination of motor skills with children aged 6 according to the balance, rhythmicity, rapid response and space orientation. MATERIAL AND METHODS The content of the paper are the results of 40 healthy children of six years old, randomly divided into two groups – control (gymnastics) and test (Emile Jaques-Dalcroze method). In the course of study in both groups were measured motor abilities of coordination based on the following motor tests : test of spatial orientation “March to the point” balance test “Get Up and Go”, rhythmicity test” rhythmic drumming of hands, “a rapid response test” Stop falling sticks”. RESULTS The results obtained in the study group compared to the control group show an acceleration of the motor development of children with skills: balance, rapid response, and rhythmicity. CONCLUSION Comparison of the eff ect of standard exercise gym with classes consistent with the method of Emile Jaques-Dalcroze in the development of coordination of motor skills in children aged 6 years showed that the best results in preschool children is achieved through a combination of rhythmic elements of exercise gym

PL

WSTĘP Głównym założeniem programu badawczego była ocena wpływu metody Emila Jaques-Dalcroze’a na kształtowanie koordynacyjnych zdolności motorycznych z zakresu zachowania równowagi, rytmizacji, szybkiej reakcji oraz orientacji w przestrzeni u dzieci 6-letnich. MATERIAŁ I METODY Materiał opracowania stanowią wyniki badań 40 zdrowych 6-letnich dzieci, podzielonych losowo na dwie grupy – kontrolną (dzieci uczęszczające na gimnastykę korekcyjną) i badaną (dzieci uczestniczące w ćwiczeniach prowadzonych metodą Emila Jaques-Dalcroze’a). W trakcie badań w obu grupach dokonano pomiarów koordynacyjnych zdolności motorycznych opartych na następujących testach motorycznych: test orientacji w przestrzeni „Marsz do celu”, test równowagi „Wstań i idź”, test rytmizacji „Rytmiczne bębnienie rękami”, test szybkiej reakcji „Zatrzymanie opadającej laski”. WYNIKI Wyniki uzyskane w grupie badanej w porównaniu z wynikami grupy kontrolnej wskazują na przyspieszenie rozwoju motorycznego dzieci z zakresu umiejętności: równowagi, szybkiej reakcji oraz rytmizacji. WNIOSKI Porównanie wpływu standardowych ćwiczeń gimnastycznych z ćwiczeniami zgodnymi z metodą Emila Jaques-Dalcroze’a na rozwój koordynacyjnych zdolności motorycznych u dzieci 6-letnich wykazało, że najlepsze rezultaty osiąga się u nich poprzez połączenie rytmiki z elementami ćwiczeń gimnastycznych.

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Administration of Greek Royal Jelly produces fast response in neurotransmission of aged Wistar male rats

51%

Pyrzanowska J. , Piechal A. , Blecharz-Klin K. , Joniec-Maciejak I. , Graikou K. , Chinou J. , Widy-Tyszkiewicz E.

Journal of Pre-Clinical and Clinical Research

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2015

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tom 09

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nr 2

EN

Introduction. Royal Jelly (RJ) is a popular bee-derived product used widely in European and Asian traditional medicine. RJ has some pharmacological activities to support health and longevity as well as prevent ageing. Objectives. To evaluate whether a short-term 6-day Royal Jelly administration is able to induce behavioural and neurochemical effects in aged rats. Materials and method. RJ (previously chemically characterized by GC-FID and GC–MS) was given to 18-month-old male Wistar rats (100 and 500mg of powder/kg b.w./day) in subcutaneous injection for 6 days. Spatial memory was assessed in a water maze. Afterwards, the level of neurotransmitters, their metabolites and turnover in the selected brain regions were estimated by HPLC. Results. Short-term RJ administration did not change spatial memory in aged rats in the water maze, although it was sufficiently active to modify most of all the serotonergic and dopaminergic transmission in the prefrontal cortex and hippocampus. Conclusion. The obtained results indicate that Royal Jelly is able to affect very quickly the neurotransmission in the brain structures responsible for cognitive performance; however, short-term administration is not sufficient to exert behavioural consequences.