Results 61 to 70 of about 27,009 (264)

Dynamic Spatial Diversity Combiner pada Kanal Fading

open access: yesJurnal Elkomika, 2019
ABSTRAK Kanal transmisi radio berkontribusi pada terjadinya efek fading yang dapat berpengaruh pada terjadinya penurunan kualitas sinyal pada penerima.
DWI ARYANTA, RIENZY PRATAMA LONDONG ALLO
doaj   +1 more source

Nonparametric maximum likelihood estimation of the survival function using current lifetime data

open access: yesCanadian Journal of Statistics, EarlyView.
Abstract An issue when estimating the failure time survival function is how to set up a prevalent cohort study infrastructure to follow subjects after enrollment. This problem can be circumvented through the well‐known Grenander density estimator using current lifetime observations only.
James H. McVittie, Masoud Asgharian
wiley   +1 more source

Statistical Analysis on Determinant Factors Associated with Time to Death of HIV/TB Co-Infected Patients Under HAART at Debre Tabor Referral Hospital: An Application of Accelerated Failure Time-Shared Frailty Models

open access: yesHIV/AIDS: Research and Palliative Care, 2021
Hailegebrael Birhan, Kenaw Derebe, Setegn Muche, Bezanesh Melese Department of Statistics, Debre Tabor University Faculty of Natural and Computational Science, Debre Tabor, Amhara, EthiopiaCorrespondence: Hailegebrael Birhan Tel +251 9-15-28-91-30Email ...
Birhan H, Derebe K, Muche S, Melese B
doaj  

Reliability Study of Electronic Components on Board-Level Packages Encapsulated by Thermoset Injection Molding

open access: yesJournal of Manufacturing and Materials Processing, 2020
A drastically growing requirement of electronic packages with an increasing level of complexity poses newer challenges for the competitive manufacturing industry.
Romit Kulkarni   +6 more
doaj   +1 more source

The damage and failure mechanism of prestatically loaded rock during medium‐strain rate cyclic impact loading

open access: yesDeep Underground Science and Engineering, EarlyView.
Based on experimental results and theoretical analysis, an established rock damage accumulation model that comprehensively considers the preapplied static load, impact peak value, impact frequency, and impact times. Abstract To study the rock damage mechanism under high static loading and superimposed medium strain rate cyclic impact loading, a series ...
Wei Wang   +6 more
wiley   +1 more source

The effect of wall thickness distribution on mechanical reliability and strength in unidirectional porous ceramics

open access: yesScience and Technology of Advanced Materials, 2016
Macroporous ceramics exhibit an intrinsic strength variability caused by the random distribution of defects in their structure. However, the precise role of microstructural features, other than pore volume, on reliability is still unknown.
Jordi Seuba   +3 more
doaj   +1 more source

Probabilistic prediction of rate‐dependent rock strength using natural gradient boosting and Gaussian process regression

open access: yesDeep Underground Science and Engineering, EarlyView.
Probabilistic natural gradient boosting and Gaussian process regression models accurately predict rate‐dependent rock strength across lithologies. Static strength and strain rate dominate, while geometric factors have minimal influence, enabling interpretable and uncertainty‐aware predictions for dynamic geomechanical applications. Abstract The dynamic
Hadi Fathipour‐Azar
wiley   +1 more source

Wind Energy Potential Assessment for Nooriabad Sindh Pakistan

open access: yesInternational Journal of Economic and Environment Geology, 2020
Wind speeds recorded at regular intervals of time for a particular wind site correspond to intermittent source of energy. Reliable estimate of wind potential for the site requires fitting of the recorded data to a continuous distribution
Muhammad Shoaib, Imran Siddiqui, Saif ur Rehman, Ibrahim Zia
doaj  

Simultaneous Enhancement of Mechanical and Dielectric Performance of Polypropylene Composites by Introducing an External Elastic Crystal

open access: yesENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A hierarchical crystalline structure for recyclable polypropylene insulation in high‐voltage cables is presented. This architecture integrates rigid isotactic polypropylene spherulites with an elastic crystalline network to balance load‐bearing capacity and ductility.
Guangwei Zhang   +6 more
wiley   +1 more source

Swedish Crop Wild Relatives: towards a national strategy for in situ conservation of CWR

open access: yesGenetic Resources, 2020
In 2015, the Nordic countries (Sweden, Denmark, Finland, Norway and Iceland) initiated a project to help strengthen the efforts of conservation and use of crop wild relatives (CWR) across the region. Policy recommendations that were put forward included
Jens Weibull, Jade Phillips
doaj   +1 more source

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