Wyniki wyszukiwania - Biblioteka Nauki

1

Parasites of markhor, urial and Chiltan wild goat in Pakistan

100%

Ahmed S.

Annals of Parasitology

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2020

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tom 66

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nr 1

2

Revitalizing community with innovative redesign of Taha Hussein Memorial Park in Alexandria

63%

Sharaf Eldin S. , Ahmed S.

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tom Nr 53

87--93

EN

Parks are complex elements of a city. They can serve scores of different uses, may be specialized in their function, or can simply provide visual appeal for residents. However they work and act to define the shape and feel of a city and its neighborhoods, they also function as a conscious tool for revitalization. Parks can upgrade the downturn of a commercial area, support the stabilization of faltering neighborhoods, and provide a landmark element and a point of pride for residents. Cultural landscape is an object of development as well as planning processes. Because of this fact a huge number of elements in urban or rural landscapes are important for preserving the historical character of a place. Moreover, nowadays they should be base for revitalization projects. The case study in this paper is an old park in Alexandria, Egypt, as an example from regional perspective. The paper analyzes cultural and natural potential of “Taha Hussein Park” in Alexandria through site observation and questionnaires. The obtained data analysis resulted in design decisions which were adapted to redesigning of the park. New functions for the memorial park which nowadays is notorious for crimes, physical deterioration, and social isolation, are demonstrated and discussed also from the sustainability point of view. Also, this paper not only sheds a new light on the understanding and reading of one of neglected green areas, but also contributes to the rethinking of the role of Urban Design today within our changing public life. It is a call for Alexandria’s residents and architects to enhance urban quality and city shape, and support the elements that are needed to make that happen.

PL

Parki są ważnymi przestrzeniami w każdym mieście. Mogą mieć różne funkcje lub po prostu zapewnić atrakcyjność wizualną mieszkańcom. Mają duży wpływ na klimat miasta i jego okolicy, pełniąc także funkcję narzędzia do rewitalizacji. Istnienie parku wpływa pozytywnie na rozwój obszaru, również zdegradowanego. Krajobraz kulturowy miasta jest również istotny na drodze rozwoju, a także procesów planowania urbanistycznego. Należy zwrócić uwagę na fakt, że wiele jego elementów wpływa bezpośrednio na szansę zachowania historycznego charakteru miejsca. Co więcej, obecnie powinny one być podstawą do projektów rewitalizacyjnych. Niniejszy artykuł dotyczy jednego z historycznych parków w Aleksandrii w Egipcie, zwanego „Taha Hussein”. Autorzy analizują jego kulturowy i naturalny potencjał wykorzystując wizje lokalne w terenie oraz wywiad. Uzyskane w ten sposób dane zaowocowały decyzjami projektowymi, które zostały uwidocznione w realizacji przebudowy parku. Nowe funkcje parku, który obecnie jest znany z przestępstw, degradacji i społecznej izolacji, jako przestrzeni pamięci są istotne również z punktu widzenia zrównoważonego rozwoju. Ten dokument nie tylko rzuca nowe światło na jeden z zaniedbanych terenów zielonych miasta, ale także przyczynia się do ponownego przemyślenia roli Urban Design dzisiaj, w naszym zmieniającym się życiu publicznym. Jest to wezwanie mieszkańców i architektów Aleksandrii do poprawy jakości przestrzeni urbanistycznych miasta oraz wsparcia wszelkich działań, które są niezbędne do osiągnięcia tego celu.

3

A New Design of Low Cost Energy Efficient Single Phase Brushless DC Motor

51%

Cvetkovski G. , Lefley P. , Petkovska L. , Ahmed S.

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tom R. 88, nr 2

170-173

EN

In the past few years Genetic Algorithms (GAs) have proved to be a very powerful and reliable optimisation tool. They have also been successfully applied in the design optimisation of many electromagnetic devices. Therefore, in this paper the optimal design performed on the single phase permanent magnet brushless DC motor (SPBLDCM) is done by using a Genetic Algorithm. The objective function of the optimisation search is selected to be the efficiency of the motor and the design process is defined as a maximisation problem. Based on the values of some specific motor parameters, a comparative analysis of the improved motor and the initial motor design is performed. As an addition to the comparative analysis, a Finite Element Method modelling and analysis of both models is also performed.

PL

W ostatnich kilku latach algorytmy genetyczne staly się jednym z poważniejszych narzędzi w rozwiązywaniu problemów optymalizacji. Dotyczy to również optymalizacji licznych urządzeń elektromagnetycznych. W tym artykule pokazano zastosowanie algorytmu genetycznego w optymalizacji silnika jednofazowego z magnesem trwały w wykonaniu bezszczotkowym. Funkcją celu w procesie optymalnego projektowania jest efektywność silnika jako wartość maksymalna. Biorąc pod uwagę kilka specyficznych parametrów silnika przeprowadzono analizę porównawczą modeli optymalnego i początkowego, a także dla obu modeli przeprowadzono analizę pracy silnika metodą elementów skończonych.

4

Design and analysis of a graphene-based Tera-Hertz antenna with lower complexities

51%

Islam M. M. , Ahmed S. , Mahmud N.

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tom 125

5

Glucose monitoring, dynamics and feedback control

51%

Rigby G. P. , Ahmed S. , Vadgama P.

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1999

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tom Vol. 19, no. 2

77-86

EN

Normal physiological changes in glucose exhibit both ultradian and diurnal variation with superimposed low amplitude biphasic cyclic fluctuation. Attempts to mimie the natural pancreatic response by use of integrated artificial biofeedback systems have presented a complex problem. Although several complete and partial control models have been developed for predictive therapy regimens, these are most suited to advisory roles and would prove inadequate and possibly dangerous if relied up on implicitly. Over the past decade many researchers have driven forward the development of real-time monitoring sensors deviees but in the majority of cases excessive time delays resultant from sampling delays or restrictive implant sites have compromised the efficiency of feedback performance. Ideally the use of non-invasive technology as provided by infrared based deviees holds most promise for continuous, painless monitoring but the technology is still in its infancy. More secure for current use are enzyme based biosensors, notably a recently modified implantation strategy, incorporating fluid microflow into tissue.

PL

Stężenie glukozy we krwi wykazuje fizjologiczne wahania, podlegając nakładającym się niskoamplitudowym dwufazowym fluktuacjom w cyklach 24-godzinnym i krótszych. Próba naśladowania naturalnej odpowiedzi trzustki na stężenie glukozy za pomocą złożonych, opartych na biologicznym sprzężeniu zwrotnym, sztucznych systemach, okazała się skomplikowanym zagadnieniem. Chociaż opracowano kilkanaście pełnych i częściowych modeli przeznaczonych do przewidywania wyników terapii, to, są one raczej dostosowane do pełnienia funkcji doradczych. Bezpośrednie oparcie się na nich w leczeniu byłoby nieodpowiednie i potencjalnie niebezpieczne. W ciągu ostatniego dziesięciolecia wielu badaczy podejmowało próby opracowania czujników monitorujących stężenie glukozy w czasie rzeczywistym, ale w większości przypadków nadmierne opóźnienia wynikające z opóźnień próbkowania lub ograniczeń związanych z miejscem wszczepienia, zmniejszały efektywność realizacji pomiaru zamykającego pętlę sprzężenia zwrotnego, Zastosowanie technologii nieinwazyjnej, oferowanej przez urządzenia wykorzystujące promieniowanie podczerwone, jest najbardziej obiecujące dla realizacji ciągłego, bezbolesnego pomiaru stężenia glukozy, ale technologia ta jest wciąż w stadium początkowym. Obecnie pewniejsze są bioczujniki enzymatyczne, zwłaszcza po ostatnich modyfikacjach strategii implantacji, polegających na wprowadzeniu mikro przepływu dotkankowego.

6

Decolorization of textile dye Reactive Blue 221 by bacteria isolated from anthropogenic dye-contaminated soil

51%

Mumtaz S. , Malik N. H. , Naz I. , Ahmed S.

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nr 4

EN

The present study was conducted to evaluate the degradative potential of indigenous bacterial isolates for Reactive Blue 221. The two strains proficient in decolorization (>80%) were isolated from a waste disposal site by enrichment technique. Under optimized conditions, Pseudomonas sp. BDS 2 displayed efficient decolorization activity of 94.4% in Minimal Salt Medium supplemented with 50 mg/1 of RB 221 after 96 h of incubations, whereas 88.5% of color was removed by Alcaligenes sp. BDS 9 by the end of 112 h. UV-Visible and FTIR spectroscopy confirmed that in the case of Pseudomonas sp. BDS 2 and Alcaligenes sp. BDS 9, decolorization was the ultimate consequence of biodegradation and adsorption, respectively. Toxicological studies revealed the nontoxic nature of degradative metabolites.

7

Performance of single-chamber microbial fuel cells using different carbohydrate-rich wastewaters and different inocula

51%

Ahmed S. , Rozaik E. , Abdel-Halim H.

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nr 2

EN

A microbial fuel cell (MFC) can use wastewater as a substrate; hence, it is essential to understand its performance when seeded with different inocula and during the treatment of carbohydrate-rich wastewaters to simultaneously optimize electricity production and wastewater treatment. This study investigates the performance of single-chamber membraneless MFCs used to treat three different carbohydrate-rich synthetic wastewaters (glucose, sucrose, and soluble starch) while seeding with two different inocula (a microbial solution containing different species of microorganisms, and anaerobic sludge). The results showed that the highest voltages, power densities, and COD removal effi ciencies were obtained using microbial fuel cells fed with glucose-based synthetic wastewater, and were 351 mV, 218 mW/m2, and 98.8%, respectively, for the microbial solution, and 508 mV, 456.8 mW/m2, and 94.3%, respectively, for the anaerobic sludge. The lowest results of voltages, power densities, and COD removal effi ciencies were obtained using microbial fuel cells fed with the soluble starch-based synthetic wastewater, and were 281 mV, 139.8 mW/m2, and 86.4%, respectively, for the microbial solution, and 396 mV, 277.6 mW/m2, and 79.4%, respectively, for the anaerobic sludge. In all experiments, the voltages and power densities obtained for the anaerobic sludge were higher than those obtained for the microbial solution, and the COD removal effi ciencies obtained for the anaerobic sludge were less than those obtained for the microbial solution. This study determined that voltage generation, power densities, and COD removal effi ciencies were inversely proportional to the complexity of the carbohydrate used in single-chamber microbial fuel cells.

8

Mixing and flame holding characteristics in two-dimensional supersonic stream with perpendicular injection

51%

Ali M. , Ahmed S. , Sadrul Islam A. K. M.

International Journal of Applied Mechanics and Engineering

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2008

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tom Vol. 13, no 1

5-20

EN

This paper reports the mixing of hydrogen in a supersonic airstream and the fIame holding capability of the combustion chamber. In particular, two-dimensional Navier-Stokes equations have been solved to see the effects of injector positions on mixing and fIame holding in a supersonic combustor. An explicit Harten-Yee Non-MUSCL Modified-fIux-type TVD scheme has been used to solve the system of equations, and a zeroequation algebraic turbulence model to ca1culate the eddy viscosity coefficient. The performance of combustor has been investigated by varying the distance of injector position from the left boundary keeping constant the backward-facing step height and other ca1culation parameters. The results show that the configuration for small distances of injector position has high mixing efficiency but the upstream recirculation cannot evolve properly which is an important factor for fIame holding capability. On the other hand, the configuration for very long distance has lower mixing efficiency due to lower gradient of hydrogen mass concentration on the top of the injector caused by the expansion of side jet both upstream and downstream of the injector. For moderate distances of injector position, large and elongated upstream recirculation can evolve which might be activated as a good flame holder.

9

Shaping the Stator Poles of BLDCPM Motor for Cogging Torque Reduction

51%

Petkovska L. , Lefley P. , Cvetkovski G. , Ahmed S.

Przegląd Elektrotechniczny

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2013

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tom R. 89, nr 2b

42--45

EN

Recently, the cogging torque in electric motors has been drastically decreased as designers and manufacturers have developed better understanding of the cogging phenomenon. The paper presents a design methodology for cogging torque reduction by an appropriate shaping of stator poles in a Brushless DC Permanent Magnet (BLDCPM) Motor. Cogging torque waveforms, along with other relevant characteristics are examined and a new stator poles design of the BLDCPM motor is proposed.

PL

W artykule przedstawiono metodę projektowania bezszczotkowej maszyny DC z magnesami trwałymi (BLDCPM), z uwzględnieniem redukcji momentu zaczepowego poprzez odpowiednie ukształtowanie biegunów stojana. Analizie poddano charakterystyki samego momentu zaczepowego jak i innych, powiązanych z zagadnieniem parametrów. Zaproponowano także nowy projekt maszyny BLDCPM.

10

Integrated filtering antenna with high selectivity band rejection for UWB applications

45%

Alhegazi A. , Zakaria Z. , Shairi N. , Salleh A. , Ahmed S.

Przegląd Elektrotechniczny

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2016

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tom R. 92, nr 9

224--228

EN

In this paper, a new design composed of an UWB monopole antenna integrated with bandstop filter (BSF) has been proposed. The bandstop filter is constructed by using a defected microstrip structure (DMS). The proposed design covers frequency bandwidth from 3 GHz to 14 GHz (129.5%), with single band rejection from 5.1 GHz to 5.8 GHz (12.8%). The new integration of filter and antenna shows a high level of rejection, wide impedance bandwidth, realized peak gain of 5.23 dB and stable omnidirectional azimuth pattern. Therefore, the proposed design is suitable to be used in reducing the possible interference problem for the UWB applications.

PL

W artykule opisano projekt anteny UWB ze zintegrowanym filtrem. Filtr został wykonany z wykorzystaniem struktury mikropaska . Antena umożliwia wykrywanie sygnałów w paśmie 3 – 14 GHz z możliwością usuwania pasma 5.1 – 5.8 GHz. Umożliwia to rozwiazywanie problemu interferencji fal.

11

Bioremediation of oil-based paint from aqueous media by novel indigenous Brevibacillus parabrevis strain NAP3 and its toxicity assessment

38%

Phulpoto A. H. , Qazi M. A. , Mangi S. , Ahmed S. , Ul-Haq I. , Phul A. R. , Kanhar N. A.

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nr 1

EN

The present study sought to explore the bioremediation of oil-based paint from aqueous media using indigenous bacterial isolate Brevibacillus parabrevis strain NAP3 and its toxicity assessment against prokaryotic and eukaryotic biological models. The bacterial isolate was initially screened for bioremediation potential in mineral salts medium containing oil-based paint (conc. 300 ppm, w/v) under shake flask settings. Moreover, the percentage removal of oil-based paint from aqueous media was investigated using a spectrophotometer at 285 nm under two different experimental conditions, i.e., with and without glucose. Evidently, the bacterial isolate displayed maximum oil-based paint removal of 83% in flasks containing glucose as an additional carbon source after 14 days of the treatment, whereas without glucose supplementation it reached up to 78%. The Fourier transform infrared (FTIR) spectra showed noticeable biodegradative changes of the oil-based paint relevant to peaks in the wave number frequency range of 800-600 cm⁻¹, 1,034 to 1,299 cm⁻¹, 1,690 to 1,725 cm⁻¹, 2,857 to 3,000 cm⁻¹, and 3,200 to 3,400 cm⁻¹ (corresponding to C-H, C-O-N, C-O-C, and CH₂ aliphatic stretch and terminal CH₃ bonds, and N-H bonds, respectively, in treated samples as compared to controls; non-inoculated samples). After treatment, the cellfree supernatants containing oil-based paints displayed reduced cytotoxicity against brine shrimp larvae, phytotoxicity against wild reddish seeds, and antimicrobial activity against selected pathogenic bacteria and fungi, which indicated the possible use of B. parabrevis as potential oil-based paint-degrading bacterium in order to restore paint-polluted environments.

12

A new TLC densitometric method for stability assessment of modafinil

38%

Faisal M. S. , Naz Z. , Shakeel F. , Ahmed S. , Kohli K. , Khar R. K.

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tom Vol. 54, No. 1

77-88

EN

TLC densitometric method for simple and sensitive stability assessment of modafinil has -been developed. The objective was to provide a rapid, precise, robust, and reproducible technique for the analysis of modafinil. The method was validated for bulk drug and tablet , formulations. It could be used to separate the drug from its degradation products. The pro- cedure employed TLC aluminum plates precoated with 60F-254 silica gel as the stationary phase. The solvent system consisted of toluene-chloroform-methanol (1:1:0.5, v/v/v) 'o'o mixture. It provided well-resolved compact spots for modafinil (Rr value 0.46 š 0.01) and allowed for separation of the excipients and degradation products. Densitometric scanning interegation was performed at the wavelength of 220 nm. Calibration plot was linear , (r2 = 0.999) in the analyte concentration range 100-5000 ng per spot. The method was validated with respect to linearity, accuracy recovery, precision, ruggedness, and specificity. The limit of detection and quantification were 20.54 ng per spot and 62.26 ng per spot, respectively. The determined drug content was within the š5% range of the labeled content. The drug was analyzed under different stress conditions in order to study its degradation in the presence of acid, base, and peroxide.

PL

Opracowano densytometryczną metodę TLC pozwalającą na proste i czułe badanie stabilności modafinilu. Opracowana technika była szybka, precyzyjna, odporna na warunki zewnętrzne i powtarzalna. Metodę zwalidowano dla substancji farmaceutycznej i tabletek. Można ją stosować do oddzielenia leku od produktów rozkładu. Jako fazę stacjonarną użyto żel krzemionkowy 60F-254 naniesiony na płytki aluminiowe. Fazę ruchomą stanowiła '"' mieszanina: toluen-chlorofbrm-metanol (1:1:0,5; v/v/v). Otrzymywano dobrze rozdzielone, zwarte plamki modafinilu (wartość Rf 0.46 š 0.01), oddzielone od substancji pomocniczych i produktów rozkładu. Skanowanie densytometryczne prowadzono przy długości fali 220 nm. Krzywa kalibracyjna miała charakter liniowy (r2 = 0,999) w zakresie stężeń analitu 100-5000 ng na plamkę. Metodę zwalidowano w zakresie liniowości, dokładności, odzysku, precyzji, odporności na czynniki zewnętrzne i specyficzności. Granica wykrywalności i oznaczalności ilościowej wynosiły odpowiednio 20,54 ng i 62.26 ng na plamkę. Oznaczana zawartość leku mieściła się w granicach š 5% ilości deklarowanej. Lek analizowano w różnych warunkach stresowych w celu zbadania jego degradacji w obecności kwasów, zasad i nadtlenków.

13

Collection of hospital wastewater data using deduplication approaches

32%

Khan N. A. , Sinha G. R. , Ahmed S. , Feshchenko A. , Changani F. , Qureshi A. , Mazhar M. A. , Neklonskyi I.

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tom Vol. 104, nr 1

5--18

EN

Purpose: This investigation aims to study the various approaches currently used to reduce the load on computer servers in order to better manage data on hospital wastewater treatment and solid waste generation. Design/methodology/approach: This manuscript investigates the taxonomies of deduplication procedures based on literature and other data sources, thereby presenting its classification and its challenges in detection. Findings: Based on the literature survey of deduplication techniques, the method of deduplication dispensed on cloud gadget devices has been found to be a promising research challenge. The gaps discussed include a reduction in storage space, bandwidth, type of disks used, and expenditure on energy usage and heat emissions when implementing these strategies. The art work on a scalable, robust, green and allocated approach to deduplication for a cloud gadget will remain of interest in destiny. Research limitations/implications: Considerable attention is focused on the deduplication due to efficient, extensive storage system. Practical implications: This research paper will be useful to identify deduplication techniques which are nowadays used in different hospital wastewater data collection systems and put significant proposals for further improvements in deduplication. Originality/value: This manuscript portrays a broader assessment of the available literature for data duplication along with the classification of different methods for the data storage used in the different level of storage of hospital wastewater data collection.

14

Boron facilitates rice growth, development, and related attributes under saline soil conditions

32%

Uddin R. , Nuruzzaman M. , Briste P. S. , Islam M. , Bhuiyan A. K. , Joy I. H. , Ahmed S. , Khatun A.

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2021

|

tom 74

|

nr 1

15

Estimating anticipated performance index and air pollution tolerance index of some trees and ornamental plant species for the construction of green belts

32%

Leghari S. K. , Akbar A. , Qasim S. , Ullah S. , Asrar M. , Rohail H. , Ahmed S. , Mehmood K. , Ali I.

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tom 28

|

nr 3

EN

This study combines air pollution tolerance index (APTI) and anticipated performance index (API) in order to determine the potential of trees and ornamental shrubs that are frequently growing on the roads of Quetta, Pakistan, and the campus of the University of Balochistan, in Quetta, for green belt development. Our investigation exposed that not only APTI is suitable for the fitness of trees for building green belts. It is used to categorize vulnerable plant species for only bio-monitoring. The grouping of APTI and API in the present study is a practical technique for decreasing air pollution control. Laboratory analysis for APTI was carry out by the four physico-biological factors such as leaf extract pH, total chlorophyll content, ascorbic acid content, and relative water content. API for different plant species (trees and ornamental shrubs) was determined depending upon the characteristic grading by allotted + or – to the plants. The standard for determining API is given in Table 2. For examining the relationships among these factors statistics were utilized. This study indicated that the APTI is used as an instrument for choosing suitable plants to reduce environmental urban heat. API designated that Morus alba L., Pinus halepensis Miller, Ficus carica L., and Pistacia vera L. with API = 6 are excellent performers for green belt development. Morus nigra L. and Malus pumila Miller had API 5 and are considered very good performers, and Fraxinus angustifolia Vahl., Prunus armeniaca L., and Platycladus orientalis L. showed 4 API values with good performance for green belt formation. All the other remaining investigated trees and ornamental shrubs demonstrated poor values of API and are not recommended for green belts as they act as bio-indicators. Data also exhibited that all the examined trees had higher API values then the ornamental shrubs. This study suggested that the integration of both APTI and API of plants is extremely beneficial for the construction of green belts.

16

Heptoprotective role of Artemisia scoparia Waldst. and kit against CCl4-induced toxicity in rats

26%

Waris T. S. , Khan M. R. , Shah N. A. , Shuaib M. , Hussain F. , Ishaq M. , Kamal Z. , Zeb U. , Ali S. , Ahmed S. , Hussain F.

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nr 3

EN

In this study, the methanol extract of Artemisia scoparia was evaluated for its protective potential against carbon tetrachloride (CCl₄)-induced hepatic toxicity. Seven groups of mature albino rats were used in the course of the experiment and each group was treated with specific doses of plant extract and CCl₄. Silymarin was used as a standard protective drug. The results of the experiment revealed that Artemisia scoparia plant extract was successful in fighting CCl₄ toxicity as it clearly reduced the elevated levels of liver serum markers (alkaline phosphatase and alkaline aminotransferase), lipid peroxidation, nitrite content, and H₂O₂ on one side while enhancing the levels of antioxidant enzymes (catalase, peroxidase, superoxide dismutase, glutathione-s-transferase, γ-Glutamyltranspeptidase, and glutathione reductase) and protein content. It also protected DNA from the damaging effects of CCl₄. The findings of this study demonstrate that Artemisia scoparia plant extract plays a significant role in preventing the hepatic damages instigated with CCl₄ and can be used as a protective agent against oxidative stress-associated disorders.

17

Motijheel Lake - victim of cultural eutrophication

26%

Biswas M. , Mandal D. , Sonar R. , Dey B. , Ghosh S. , Ghosh S. , Chattarjee J. , Bhattacharyya B. , Saha I. , Ahmed S. , Basu A.

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tom 21

EN

Destruction of natural water bodies due to cultural eutrophication is a predominant problem in India. Motijheel Lake of Murshidabad district is an environmentally, economically and historically significant water body. However, Anthropogenic activities including unplanned settlements around this lake and its over exploitation have deteriorated its water quality to a great extent. Motijheel Lake acts as a sink for domestic sewage, human and animal excreta. Surface runoffs are discharged into the lake which further adds to the list of pollutants. High phosphate, nitrate and nitrite-Nitrogen and chlorophyll content of the lake categorizes it as hypereutrophic one. Also, the amount of phosphate, nitrite and iron present in Motijheel Lake exceed the permissible limit in drinking water, as prescribed by US Environmental Protection Agency and Bureau of Indian Standards. When the Below Poverty Line residents of the surrounding area consume such water, they become susceptible to various fatal diseases. The low level of Dissolved Oxygen in the lake water signifies huge amount of organic matter deposited in the lake and indicates the lake water to be poor in quality. The high load of coliform bacteria in the lake water further corroborates the deposition of domestic, human and animal wastes. If water with such high concentration of faecal coliform is consumed, it could lead to fatal gastrointestinal and enteric diseases.