612 research outputs found
Design, Analysis and Applications of Wearable Antennas: A Review
Full text linkWearable antennas are the vital components for Body Centric Communication (BCC). These antennas have recently gained the attention of researchers and have received a great deal of popularity due to their attractive characteristics and opportunities. They are fundamental in the Wireless Body Area Networks (WBANs) for health care, military, sports, and identification purposes. Compared to traditional antennas, these antennas work in close proximity to the human body, so their performance in terms of return loss, gain, directivity, bandwidth, radiation pattern, efficiency, and Specific Absorption Rate (SAR) is influenced by the coupling and absorption of the human body tissues. Additionally, in the design of these antennas, size, power consumption, and speed can also play a paramount role. In most cases, these antennas are integrated into the clothes, or in some cases, they may be fixed over the skin of the users. When these characteristics are considered, the design of wearable antennas becomes challenging, particularly when textile materials are examined, high conductivity materials are used during the manufacturing process, and various deformation scenarios have an impact on the design’s performance. To enhance the overall performance of the wearable antennas and to reduce the backward radiation towards the human body, metamaterial surfaces are introduced that provide a high degree of isolation from the human body and significantly reduce the SAR. This paper discusses the state-of-the-art wearable/textile/flexible antennas integrated with metamaterial structures composed of wearable/flexible substrate materials, with a focus on single and dual band antenna designs. The paper also reviews the critical design issues, various fabrication techniques, and other factors that need to be considered in the design of wearable/textile/flexible antennas. All the designs presented in this work are of the recent developments in wearable technology
Wideband and High Gain Array Antenna for 5G Smart Phone Applications Using Frequency Selective Surface
Full text linkThis work presents an eight element array antenna with single layer frequency selective surface (FSS) to obtain high gain. The eight elements are fed by single port. The FSS consists of 14 × 6 unit cells with one unit cell size is 5 × 5 mm2 having wideband behavior. The antenna uses Rogers RT Duroid 5880 substrate and giving very wide bandwidth from 20 GHz to 65 GHz, covering millimeter wave 5G bands (including 28 GHz, 38 GHz and 60 GHz). The designed FSS is showing stop band transmission characteristics below −10 dB threshold from 25 GHz to 42 GHz and 59 GHz to 61 GHz. The eight element antenna integrated with the FSS reflector, which results an improvement in the gain level from 12 dB to 15 dB at 28 GHz, from 10 dB to 12 dB at 38 GHz, and from 9.5 to 11 dB at 60 GHz. The dimensions of the antenna are 65 × 27 × 0.857 mm3. The proposed antenna shows stable gain and directional radiation patterns. The simulation findings are experimentally confirmed, by testing the fabricated prototypes of the proposed antenna system
Melatonin alleviates salt damage in tomato seedling: A root architecture system, photosynthetic capacity, ion homeostasis, and antioxidant enzymes analysis
No full textFinite sample econometrics / Aman Ullah.
No full texteconomic&political bookfair2015Includes bibliographical references (p. 199-225) and index.x, 230 pages
Reading James Jackson: Who's the author?:Reading Race, Collecting Cultures - The Roving Reader Files: 'Reading James Jackson'
Full text linkThe Ahmed Iqbal Ullah Race Relations Resource Centre is an open access University of Manchester facility. The blog 'Reading Race, Collecting Cultures' (www.aiucentre.wordpress.com) features on its website (http://www.racearchive.manchester.ac.uk). The Roving Reader Files category of blog posts is produced by Alison Newby (under the pseudonym The Roving Reader) in collaboration with Hannah Niblett (Collections Access Officer). The former provides the text and the latter provides the images. The Roving Reader Files are designed as public engagement materials. The intention is to introduce research skills and terminology to the general user/reader in an entertaining yet informative manner by revealing hidden stories, making unusual connections and sharing insights into using the Centre's collection for research. The related posts "Reading James Jackson: Who's the author?" and "Reading James Jackson: Footnotes" introduce readers to biography; scholarly editions and the role of the editor; the importance of contextualising sources in their historical period; footnotes and their uses
Contributions to the Field of Library and Information Sciences in Pakistan: A Bio Bibliometric Study of Dr. Saeed Ullah Jan
Full text linkAbstract
Purpose- This paper presents the bio-bibliometric analysis of Dr. Saeed Ullah Jan\u27s contributions to the Library and Information Science (LIS) field in Pakistan. This study includes the following: the year-wise distribution of research produced; authors\u27 collaboration; publications by type; language; geographical preference for research; and coverage of different subject areas.
Methodology/Design- The data for this retrospective study was requested through email from Dr. Saeed Ullah Jan with advance ethical permission and further verified from Scholar Google, the official university website, and departments where required.
Findings- The results of the study indicate that Dr. Saeed Ullah Jan is a prolific writer and supervisor in LIS in Pakistan. He contributed 178 items, including 76 articles, two books, 86 theses, and fourteen conference papers, and secured eleven research grants until June 30, 2022. His most significant contribution is establishing two LIS departments with two postgraduate LIS education (MPhil and PhD) programs for the first time in Khyber Pakhtunkhwa. He has the honor of launching the first LIS Higher Education Commission (HEC) recognized research journal from the fertile land of Khyber Pakhtunkhwa, Pakistan. Research work by Dr. Saeed Ullah Jan has received worldwide recognition and has been accepted in leading journals in the United Kingdom, Canada, Japan, and the United States of America. He used the English language to publish the majority of his research work. He believes in teamwork, and about 98% of his research work was done in collaboration. He is also an HEC recognized and approved Ph.D. supervisor.
Originality- This study is a unique biobibliometric study that systematically combined the research productivity of Dr. Saeed Ullah Jan and provided a holistic sketch of the literature produced on various themes of LIS during 2011–2022.
Research limitations- Due to the limited area of biobibliometrics of a single author, the results were not generalized
British Rule in the Subcontinent, Literary Movements, and the Authors of the Partition Period: Qudrat Ullah Shahab
No full textDue to the rapid development of events since the 19th century alongside the British rule of the Indian subcontinent, genres such as novels and short stories were left out of Urdu literature. At that time, poetry had a great influence on mobilizing the masses, and a poetry-oriented trend had occurred in Urdu literature. However, at the beginning of the 20th century when Qudrat Ullah Shahab lived, an important Urdu literature writer and subject of the article, stories and novels are seen to have gained popularity alongside the poetry genre. Although prose had come about from Western literary figures in this period, these writers had dealt with stories specific to their own regions. As the people found their lives in these works, prose also consolidated its place in literature. Qudrat Ullah Shahab lived between 1920-1986, the period thatwitnessed the division of Pakistan and India, and succeeded in reflecting the painful life stories of this period in his stories as best he could. This study aims to introduce the life, literary personality, and works of Qudrat Ullah Shahab as one of the important writers of the Indian subcontinent who lived through the Partition period and was especially famous for his autobiography titled Shahabnama. Before talking about the author in this context, mentioning the situation of the subcontinent and the literary movements regarding the types of prose in his period would be appropriate
Protective Mechanisms of Melatonin Against Vanadium Phytotoxicity in Tomato Seedlings: Insights into Nutritional Status, Photosynthesis, Root Architecture System, and Antioxidant Machinery
No full text4D SignWordNet: Building a Comprehensive Video Dataset for Bengali Sign Word Recognition Model and Language Model
No full textThis dataset contains videos illustrating Bengali Sign Language. 6 Bangladeshi adults created this dataset with the specific goal of addressing the absence of a comprehensive video dataset for Bengali Sign Language. This dataset serves as a bridge to fill this gap by offering a rich resource to develop real-life expert systems. This dataset aims to include all aspect of practical sign language usage, addressing the critical need for variety. This dataset comprises two parts as word and sentences each of which includes two sections. The first section involves Raw Video Data and the second involves the Masking Data. Within the Masking Video Data, there are two types of videos: with background and without background. For the word part, each section and sub section contain 102 classes with approximately 300 videos per class, resulting in a total of approximately 30,600 videos in each section and approximately 91,800 videos overall. And for the sentence part, each section and sub section comprise 20 classes with approximately 100 videos per class, resulting in a total of approximately 2000 videos in each section and approximately 6000 videos overall. Notably, both sections of the dataset prioritize diversity by capturing videos in various backgrounds and lighting conditions, ensuring its suitability for real-world applications. This dataset is made available through a data use agreement.
*** Data Usage Agreement (DUA)***
This Data Usage Agreement (DUA) is made between the Authors and the Readers for the use of the “4D SignWordNet: Building a Comprehensive Video Dataset for Bengali Sign Word Recognition Model and Language Model”. By requesting and using this dataset, reader agree to comply with the terms and conditions outlined below.
1. Purpose
The dataset is provided with the specific goal of addressing the absence of a comprehensive video dataset for Bengali sign language. It aims to support the development of real-life expert systems and other research or applications that require a rich resource of Bengali sign language videos.
2. Access Request Procedure
To request access to the dataset, Readers must:
2.1. Submit a written request to the corresponding author, Nasima Begum, at
[email protected], including:
• Name and affiliation of the requester.
• Purpose of the data request, including a brief description of the intended use.
• Agreement to the terms and conditions of this DUA.
2.2. Await approval from the Authors. The Authors reserve the right to deny access requests at their discretion.
3. Terms and Conditions of Use
By accessing and using the dataset, Readers agree to the following terms:
• Non-Commercial Use: The dataset shall be used solely for academic, research, and educational purposes. Commercial use is strictly prohibited.
• Data Integrity: Readers shall not modify or alter the dataset except as necessary for analysis purposes.
• Confidentiality: Readers must keep the dataset secure and not share it with unauthorized individuals or third parties.
• Credit and Attribution: Any publication or presentation resulting from the use of the dataset must properly credit the Authors and cite the original source of the dataset.
4. Compliance and Reporting
• Readers agree to comply with all applicable laws and regulations regarding data use and privacy.
• Readers must report any findings, publications, or derivative works resulting from the dataset to the corresponding author, Nasima Begum, at [email protected].
5. Termination
The Authors reserve the right to terminate this agreement and the Reader's access to the dataset at any time if the Reader is found to be in violation of the terms and conditions outlined in this DUA.
6. Liability
The dataset is provided "as is" without any warranties, express or implied. The Authors shall not be liable for any damages arising from the use or inability to use the dataset.
7. Amendments
This agreement may be amended by the Authors at any time. Any amendments will be communicated to the Readers via email.
By requesting and using the dataset, you acknowledge that you have read, understood, and agreed to the terms and conditions of this Data Usage Agreement.
Contact information:
Dr. Nasima Begum
[email protected]
Safi Ullah Chowdhury
[email protected]</a
Synthesis of CZTS kesterite by pH adjustment in order to improve the performance of CZTS thin film for photovoltaic applications
No full text[EN] Quaternary CZTS (Cu2ZnSnS4) kesterite thin layers were successfully made by electrochemical deposition method. CZTS thin layers were deposited on Indium Tin Oxide (ITO) from an aqueous solution. In this work, the effects of pH adjustment under ambient conditions of CZTS thin films were studied. The as grown samples were investigated by numerous existing characterization systems. The X-ray diffraction (XRD) proves the polycrystalline description of the layer. The average crystallite size is varying from 10 nm to 24 nm of the films is dependent on the pH of the solution. All the thin films are in the CZTS kesterite phase attributed to A(1) mode at 334 cm(-1) verified by Raman spectroscopy. The SEM and AFM study show that the pH variation of the so-lution improved the surface morphology and topography of the CZTS thin films which increase several nm in grain size. Moreover, the optical analysis indicates a suitable band gap in the range of 1.5-1.8 eV depending upon the sulfurization temperature. It is found that the pH variation affects both the stability and the performance of the high-quality CZTS absorber layer applications. The CZTS layer with 4.80 pH was annealed at 450 degrees C and 500 degrees C, and at these temperatures the band gap was varied. At the end the band gap variations effect on the performance of CZTS based solar cell is being analyzed by using a simulation tool SCAPS-1D.Author Sha fi Ullah acknowledged the post -doctoral contract supported by the, RRHH, postdoctoral contract (PAID-10-20), and Ministerio de Economia y Competitividad (Grant Number PID2019-107137RB-C21) , Universitat Politècnica de València (UPV) Spain. Author Amal Bouich acknowledged the Post -doctoral contract supported by the, RRHH, Postdoctoral contract the Margarita Salas fi nanced with union European Next Generation EU. This research has been funded by Grant PID2019-107137RB-C21 funded by MCIN/AEI/10.13039/501100011033 and by "ERDF A way of making Europe". The author Muhammad Aamir Sha fi acknowledge the Higher Education Commission of Pakistan, International Research Support Initiative Program (IRSIP) , for grant No: 1-8/HEC/HRD/2020/10744 PIN: IRSIP 45 Engg 17.Aamir Shafi, M.; Khan, L.; Ullah, S.; Bouich, A.; Ullah, H.; Mari, B. (2022). Synthesis of CZTS kesterite by pH adjustment in order to improve the performance of CZTS thin film for photovoltaic applications. Superlattices and Microstructures. 164:1-10. https://doi.org/10.1016/j.spmi.2022.107185S11016
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