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  1. Buch ; Online: Channel Coding with Mean and Variance Cost Constraints

    Mahmood, Adeel / Wagner, Aaron B.

    2024  

    Abstract: We consider channel coding for discrete memoryless channels (DMCs) with a novel cost constraint that constrains both the mean and the variance of the cost of the codewords. We show that the maximum (asymptotically) achievable rate under the new cost ... ...

    Abstract We consider channel coding for discrete memoryless channels (DMCs) with a novel cost constraint that constrains both the mean and the variance of the cost of the codewords. We show that the maximum (asymptotically) achievable rate under the new cost formulation is equal to the capacity-cost function; in particular, the strong converse holds. We further characterize the optimal second-order coding rate of these cost-constrained codes; in particular, the optimal second-order coding rate is finite. We then show that the second-order coding performance is strictly improved with feedback using a new variation of timid/bold coding, significantly broadening the applicability of timid/bold coding schemes from unconstrained compound-dispersion channels to all cost-constrained channels. Equivalent results on the minimum average probability of error are also given.
    Schlagwörter Computer Science - Information Theory
    Erscheinungsdatum 2024-01-29
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel: A Low-Cost Silica Fiber/Epoxy Composite with Excellent Dielectric Properties, and Good Mechanical and Thermal Stability.

    Haider, Imran / Gul, Iftikhar Hussain / Umer, Malik Adeel / Baig, Mutawara Mahmood

    Materials (Basel, Switzerland)

    2023  Band 16, Heft 23

    Abstract: In many electronic applications, the dielectric and structural properties of reinforced composites are vital. In this research work, the influence of fiber proportion on the properties of a silica fiber/epoxy (SFE) composite was investigated. The ... ...

    Abstract In many electronic applications, the dielectric and structural properties of reinforced composites are vital. In this research work, the influence of fiber proportion on the properties of a silica fiber/epoxy (SFE) composite was investigated. The structure, morphology, dielectric constant and loss factor, mechanical properties, and thermal stability were determined. The increase of wt.% of silica fiber (SiO
    Sprache Englisch
    Erscheinungsdatum 2023-11-29
    Erscheinungsland Switzerland
    Dokumenttyp Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16237410
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: TiO

    Naveed, Abdul Basit / Javaid, Aftab / Zia, Adeel / Ishaq, Muhammad Tayyab / Amin, Muhammad / Farooqi, Zia Ur Rahman / Mahmood, Azhar

    ACS omega

    2023  Band 8, Heft 2, Seite(n) 2173–2182

    Abstract: In the present work, ... ...

    Abstract In the present work, TiO
    Sprache Englisch
    Erscheinungsdatum 2023-01-01
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.2c04841
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  4. Artikel ; Online: Exploring vegetation trends and restoration possibilities in Pakistan by using Hurst exponent.

    Ahmad, Adeel / Zhang, Jiahua / Bashir, Barjeece / Mahmood, Kashif / Mumtaz, Faisal

    Environmental science and pollution research international

    2023  Band 30, Heft 40, Seite(n) 91915–91928

    Abstract: Vegetation cover change and its interaction with climate are significant to study as it has impact on ecosystem stability. We used the Normalized Difference Vegetation Index (NDVI) and climatic factors (temperature and rainfall) for investigating the ... ...

    Abstract Vegetation cover change and its interaction with climate are significant to study as it has impact on ecosystem stability. We used the Normalized Difference Vegetation Index (NDVI) and climatic factors (temperature and rainfall) for investigating the relationship between vegetation and climate. We also traced spatiotemporal changes in the vegetation in Pakistan from 2000 to 2020; we used the Hurst exponent to estimate future vegetation trends in Pakistan. Our results show an increase in vegetation throughout Pakistan, and the Punjab Province is showing the highest significant vegetation trend at 88.51%. Our findings reveal that the response of vegetation to climate change varies by region and is influenced by local climatic conditions. However, the relationship between rainfall and annual NDVI is stronger than the temperature in the study area-Pakistan. The Hurst exponent value is above 0.5 in all four provinces, that is, the indication of consistent vegetation trends in the future. The highest values are observed in Punjab and Khyber Pakhtunkhwa (KPK). In the Punjab Province, 88.41% of the area showed positive development, with forests in particular showing a significant positive effect on land use classes. On the other hand, the Sindh Province has the highest negative result at 2.87%, with urban areas showing the highest negative development. To sum up, the NDVI pattern and change attribute suggest vegetation restoration in Pakistan.
    Mesh-Begriff(e) Ecosystem ; Pakistan ; Climate Change ; Forests ; Temperature
    Sprache Englisch
    Erscheinungsdatum 2023-07-22
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-023-28822-0
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  5. Buch ; Online: Minimax Rate-Distortion

    Mahmood, Adeel / Wagner, Aaron B.

    2022  

    Abstract: We show the existence of variable-rate rate-distortion codes that meet the disortion constraint almost surely and are minimax, i.e., strongly, universal with respect to an unknown source distribution and a distortion measure that is revealed only to the ... ...

    Abstract We show the existence of variable-rate rate-distortion codes that meet the disortion constraint almost surely and are minimax, i.e., strongly, universal with respect to an unknown source distribution and a distortion measure that is revealed only to the encoder and only at runtime. If we only require minimax universality with respect to the source distribution and not the distortion measure, then we provide an achievable $\tilde{O}(1/\sqrt{n})$ redundancy rate, which we show is optimal. This is in contrast to prior work on universal lossy compression, which provides $O(\log n/n)$ redundancy guarantees for weakly universal codes under various regularity conditions. We show that either eliminating the regularity conditions or upgrading to strong universality while keeping these regularity conditions entails an inevitable increase in the redundancy to $\tilde{O}(1/\sqrt{n})$. Our construction involves random coding with non-i.i.d.\ codewords and a zero-rate uncoded transmission scheme. The proof uses exact asymptotics from large deviations, acceptance-rejection sampling, and the VC dimension of distortion measures.
    Schlagwörter Computer Science - Information Theory
    Thema/Rubrik (Code) 003
    Erscheinungsdatum 2022-02-09
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    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Artikel: Silica-Fiber-Reinforced Composites for Microelectronic Applications: Effects of Curing Routes.

    Haider, Imran / Gul, Iftikhar Hussain / Umer, Malik Adeel / Baig, Mutawara Mahmood

    Materials (Basel, Switzerland)

    2023  Band 16, Heft 5

    Abstract: For curing of fiber-reinforced epoxy composites, an alternative to thermal heating is the use of microwave energy, which cures quickly and consumes less energy. Employing thermal curing (TC) and microwave (MC) curing methods, we present a comparative ... ...

    Abstract For curing of fiber-reinforced epoxy composites, an alternative to thermal heating is the use of microwave energy, which cures quickly and consumes less energy. Employing thermal curing (TC) and microwave (MC) curing methods, we present a comparative study on the functional characteristics of fiber-reinforced composite for microelectronics. The composite prepregs, prepared from commercial silica fiber fabric/epoxy resin, were separately cured via thermal and microwave energy under curing conditions (temperature/time). The dielectric, structural, morphological, thermal, and mechanical properties of composite materials were investigated. Microwave cured composite showed a 1% lower dielectric constant, 21.5% lower dielectric loss factor, and 2.6% lower weight loss, than thermally cured one. Furthermore, the dynamic mechanical analysis (DMA) revealed a 20% increase in the storage and loss modulus along with a 15.5% increase in the glass transition temperature (Tg) of microwave-cured compared to thermally cured composite. The fourier transformation infrared spectroscopy (FTIR) showed similar spectra of both the composites; however, the microwave-cured composite exhibited higher tensile (15.4%), and compression strength (4.3%) than the thermally cured composite. These results illustrate that microwave-cured silica-fiber-reinforced composite exhibit superior electrical performance, thermal stability, and mechanical properties compared to thermally cured silica fiber/epoxy composite in a shorter time and the expense of less energy.
    Sprache Englisch
    Erscheinungsdatum 2023-02-22
    Erscheinungsland Switzerland
    Dokumenttyp Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16051790
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel: Multiparametric optimization of a reheated organic Rankine cycle for waste heat recovery based repowering of a degraded combined cycle gas turbine power plant

    Reshaeel, Muhammad / Javed, Adeel / Jamil, Ahmad / Ali, Majid / Mahmood, Mariam / Waqas, Adeel

    Energy conversion and management. 2022 Feb. 15, v. 254

    2022  

    Abstract: The study has conducted multiparametric optimization of a newly modified double stage reheated organic Rankine cycle configuration for the objective function of specific work output and its comparison with other conventional configurations of the organic ...

    Abstract The study has conducted multiparametric optimization of a newly modified double stage reheated organic Rankine cycle configuration for the objective function of specific work output and its comparison with other conventional configurations of the organic Rankine cycle for the waste heat recovery-based repowering of a degraded combined cycle gas turbine power plant using R245fa, R113, and R141b as the working fluids. Thermodynamic performance of the triple cycle formed by integrating each organic Rankine cycle configuration with the combined cycle gas turbine unit is assessed in terms of repowering, specific fuel consumption and specific water consumption along with the associated greenhouse gas emissions. 24-hour performance variation of the combined cycle gas turbine unit has been incorporated in the analysis. It is found that the double stage reheated organic Rankine cycle configuration has outperformed other configurations in terms of thermodynamic performance. Triple cycle for the double stage reheated organic Rankine cycle has resulted in an average of 1.37% increase in net power output for the working fluid R141b, equivalent to 5.10 MW of additional power output. The thermal efficiency of the triple cycle for double stage reheated organic Rankine cycle has increased by 1.40%, whereas the specific fuel consumption and specific water consumption have reduced by 1.28% and 3.35%, respectively using R141b as the working fluid. The highest waste heat recovery potential is exhibited by the integrated basic organic Rankine cycle configuration for the working fluid R245fa, recovering 30,840 kW of waste heat, equivalent to the burning of 2467.2 kg/hr of CH₄ and 6784.7 kg/hr CO₂ emissions.
    Schlagwörter administrative management ; carbon dioxide ; energy conversion ; energy use and consumption ; greenhouse gases ; power plants ; waste heat recovery
    Sprache Englisch
    Erscheinungsverlauf 2022-0215
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2022.115237
    Datenquelle NAL Katalog (AGRICOLA)

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  8. Buch ; Online: Lossy Compression with Universal Distortion

    Mahmood, Adeel / Wagner, Aaron B.

    2021  

    Abstract: A novel variant of lossy coding is considered in which the distortion measure is revealed only to the encoder and only at run-time. Two forms of rate redundancy are used to analyze the performance, and achievability results of both a pointwise and ... ...

    Abstract A novel variant of lossy coding is considered in which the distortion measure is revealed only to the encoder and only at run-time. Two forms of rate redundancy are used to analyze the performance, and achievability results of both a pointwise and minimax nature are demonstrated. One proof uses appropriate quantization of the space of distortion measures while another uses ideas from VC dimension and growth functions. Future research directions pertaining to Rissanen's redundancy result are discussed.
    Schlagwörter Computer Science - Information Theory
    Erscheinungsdatum 2021-10-13
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    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  9. Artikel ; Online: Challenges to globalization and its impact on prevailing international liberal order

    Muhammad Adeel Khan / Manzoor Ahmad Naazer / Amna Mahmood

    Liberal Arts and Social Sciences International Journal, Vol 5, Iss

    2021  Band 1

    Abstract: Challenges to globalization have grave implications for the worldwide liberal order that emerged with the end of the cold war. These challenges began to ascend from the West. The occasions like Brexit, ascent of radical rightist political groups in ... ...

    Abstract Challenges to globalization have grave implications for the worldwide liberal order that emerged with the end of the cold war. These challenges began to ascend from the West. The occasions like Brexit, ascent of radical rightist political groups in Europe, recognition of isolationist policies, choice of former US President Donald Trump (Originator of isolationist policies), and the strive towards confinement of manufacture and services have altered the contours of global liberal order. The objective of this examination is to find the factors that prepared ground for anti-globalization accounts as well as to discover its effect on the global liberal order by applying the content analysis method. This study will assume qualitative methodology utilizing both primary and secondary data i.e., government documents, annual reports, speeches of leaders, books, journal articles and newspapers etc. The findings of the study concludes that anti-globalization narratives are translating into the electoral processes, progressing hyper-nationalism over liberal order; multi-polarity above Uni-polarity; and Isolationism above free market economy. All such changes have critical repercussions for the global liberal order, hence, should be observed cautiously. If the pattern proceeds, the world pioneers ought to think about modifying the worldwide associations, alliances, as well as national security procedures.
    Schlagwörter Globalization ; unipolarity ; multipolarity ; liberal order ; anti globalization waves ; anti-globalization ; Social Sciences ; H ; Political science ; J
    Sprache Englisch
    Erscheinungsdatum 2021-06-01T00:00:00Z
    Verlag IDEA PUBLISHERS
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  10. Artikel ; Online: Separation of Fe from wastewater and its use for NO

    Sharif, Hafiz Muhammad Adeel / Ali, Moazzam / Mahmood, Ayyaz / Asif, Muhammad Bilal / Din, Muhammad Aizaz Ud / Sillanpää, Mika / Mahmood, Asif / Yang, Bo

    Chemosphere

    2022  Band 303, Heft Pt 2, Seite(n) 135103

    Abstract: The nitrogen and sulphur oxide ( ... ...

    Abstract The nitrogen and sulphur oxide (NO
    Mesh-Begriff(e) Catalysis ; Edetic Acid/chemistry ; Environmental Restoration and Remediation ; Iron/chemistry ; Oxidation-Reduction ; Waste Water
    Chemische Substanzen Waste Water ; Edetic Acid (9G34HU7RV0) ; Iron (E1UOL152H7)
    Sprache Englisch
    Erscheinungsdatum 2022-05-24
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2022.135103
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