430 research outputs found
Synthesis and Characterization of Sintered Sr/Fe-Modified Hydroxyapatite Bioceramics for Bone Tissue Engineering Applications
No full textIn the current study, Sr/Fe co-substituted hydroxyapatite (HAp) bioceramics were prepared by the sonication-assisted aqueous chemical precipitation method followed by sintering at 1100 °C for bone tissue regeneration applications. The sintered bioceramics were analyzed for various structural and chemical properties through X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy, which confirmed the phase purity of HAp and Sr/Fe co-substitution into its lattice. The Vickers hardness measurement, high blood compatibility (less than 5% hemolysis), and ability to support the adhesion, proliferation, and osteogenic differentiation of human mesenchymal stem cells suggest the suitability of Sr/Fe:HAp bioceramics for bone implant applications. The physicochemical analysis revealed that the developed Sr/Fe:HAp bioceramics exhibited a polyphasic nature (HAp and βTCP) with almost identical structural morphology having a particle size less than 0.8 μm. The dielectric constant (ε') and dielectric loss (ε″) were potentially affected by the incorporated foreign ions together with the polyphasic nature of the material. The Sr/Fe co-substituted samples demonstrated extended drug (5-fluorouracil and amoxicillin) release profiles at the pH of physiological medium. The multifunctional properties of the developed HAp bioceramics enabled them to be an auspicious candidate for potential biomedical applications, including targeted drug-delivery applications, heating mediator in hyperthermia, and bone tissue repair implants.</p
Finite sample econometrics / Aman Ullah.
No full texteconomic&political bookfair2015Includes bibliographical references (p. 199-225) and index.x, 230 pages
Preparation of electrospun nanofibrous polycaprolactone scaffolds using nontoxic ethylene carbonate and glacial acetic acid solvent system
No full textIn recent years, solution electrospinning has attracted the interest of researchers due to the possibility to design nanofibrous scaffolds with large surface area to volume ratios. Polycaprolactone (PCL), because of its biocompatibility and easy processability, has been widely used to develop electrospun structures for tissue engineering. However, the use of organic solvents and the poor PCL solution stability still hinder the development of the solution electrospinning process. The relatively benign glacial acetic acid (GAC) as a solvent of PCL was used to fabricate microfibrous fibers or beaded fibers. Thus, ethylene carbonate (EC) as a nontoxic assistant solvent was added to the PCL/GAC solution to successfully fabricate electrospun nanofibrous PCL scaffolds. The stability of the PCL/GAC/EC solution system was demonstrated as the viscosity, which showed no significant change during 48 h. The ultrafine PCL fiber diameter decreased as EC concentration was increased from 0 to 9 vol% and started to slightly increase when EC concentration increased beyond 9 vol%. MTT assay evidenced that MC3T3-E1 cells on the nanofibrous PCL scaffolds exhibited a better enhancement on cell proliferation. In summary, EC was added in PCL/GAC to establish a stable and low toxic solution electrospinning system, which provides promising strategy in tissue engineering field. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48387
Reading James Jackson: Who's the author?:Reading Race, Collecting Cultures - The Roving Reader Files: 'Reading James Jackson'
No full textThe 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
No full textAbstract
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
4D 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
Novel compositional engineering for ~26% efficient CZTS-perovskite tandem solar cell
No full text[EN] The production and commercialization of solar cells should meet such social criteria as price affordability, environment friendly, stability, and high efficiency of established materials.Various solar cells have been suggested and investigated in the past; but in this work, CZTS-Pemvskite tandem solar cell having a model "CZTS/PSC/CZTS/ZnO/FTO" was taken from the reported work as a reference. Furthermore, inserting the CdS as a buffer layer with the new model, "CZTS/ PSC/CZTS/CdS/ZnO/FTO" was simulated with SCAPS-1D software. Moreover, it was observed that the effect of CdS enhanced the tandem device efficiency from the base case of 22.57% without the CdS buffer layer to 25.95% with CdS and carried out further optimizations. This improvement is beneficial for CZTS-Perovskite tandem solar cells. The J-V characteristics curve and energy band diagram was generated using this model. Later on, with this new model, the effect of the thickness of CZTS layer on the solar cell's performance was investigated. So, the thickness also significantly affected the characteristic parameters of the solar cell as well as the J-V characteristics curve. Hence, a photo-conversion efficiency of 25.95% with Voc 1.18 V, Jsc 24.79 mA/cm(2) and FF 88.36%, the obtained results demonstrating that the proposed CZTS-perovskite tandem solar cell may concrete the way for the production of low-cost and more efficient photovoltaic applications.The work was supported by Higher Education Commission of Pakistan, International Research Support Initiative Program (IRSIP) under grant No: 1-8/HEC/HRD/2020/10744 PIN: IRSIP 45 Engg 17. Author Amal Bouich acknowledged the Post-doctoral contract supported by the, RRHH, Postdoctoral contract the Margarita Salas financed with union European Next Generation EU. Author Shafi 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 Politecnica de Vale`ncia (UPV) Spain.Aamir Shafi, M.; Khan, L.; Ullah, S.; Shafi, MY.; Bouich, A.; Ullah, H.; Marí, B. (2022). Novel compositional engineering for ~26% efficient CZTS-perovskite tandem solar cell. Optik - International Journal for Light and Electron Optics. 253. https://doi.org/10.1016/j.ijleo.2022.168568S25
Reading James Jackson: Footnotes:Reading Race, Collecting Cultures - The Roving Reader Files: 'Reading James Jackson'
No full textThe 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
- …
