470 research outputs found
Hierarchical Representations of Freebase Topics
No full textThe dataset contains more than 21M hierarchical relationships about ≈10M topics extracted from Freebase knowledgebase. The topics span the various categories of Freebase including Science & Technology, Arts & Entertainment, Sports, Society, Products & Services, Transportation, Time & Space, Special Interests, and Commons. The relationships describe the hierarchies of topics in terms of Types, Domains, and Categories. For example, ‘Albert Einstein’ can be found as a topic that is a sub-class of ‘Person’, belonging to the ‘People’ domain and ‘Society’ category. Another entity named as ‘Albert Einstein’ can also be found as a sub-class of ‘Book’, belonging to the ‘Books’ domain and ‘Arts & Entertainment’ category. The dataset is published in JSON and CSV formats, sample files are provided to help explore how the dataset is structured. The dataset is believed to be useful for studying the inter-related connections among topics in different domains of knowledge. The first author may be contacted at ([email protected]) for more information. The following paper may kindly be cited in case of using the dataset. Mahmoud Elbattah, Mohamed Roushdy, Mostafa Aref, Abdel-Badeeh M. Salem. “Large-Scale Entity Clustering Using Graph-Based Structural Similarity within Knowledge Graphs”, Big Data Analytics: Tools, Technology for Effective Planning, CRC Press. https://www.researchgate.net/publication/321716589_Large-Scale_Entity_Clustering_Based_on_Structural_Similarity_within_Knowledge_Graph
Hierarchical Representations of Freebase Topics
No full textThe dataset contains more than 21M hierarchical relationships about ≈10M topics extracted from Freebase knowledgebase. The topics span the various categories of Freebase including Science & Technology, Arts & Entertainment, Sports, Society, Products & Services, Transportation, Time & Space, Special Interests, and Commons. The relationships describe the hierarchies of topics in terms of Types, Domains, and Categories. For example, ‘Albert Einstein’ can be found as a topic that is a sub-class of ‘Person’, belonging to the ‘People’ domain and ‘Society’ category. Another entity named as ‘Albert Einstein’ can also be found as a sub-class of ‘Book’, belonging to the ‘Books’ domain and ‘Arts & Entertainment’ category. The dataset is published in JSON and CSV formats, sample files are provided to help explore how the dataset is structured. The dataset is believed to be useful for studying the inter-related connections among topics in different domains of knowledge. The first author may be contacted at ([email protected]) for more information. The following paper may kindly be cited in case of using the dataset. Mahmoud Elbattah, Mohamed Roushdy, Mostafa Aref, Abdel-Badeeh M. Salem. “Large-Scale Entity Clustering Using Graph-Based Structural Similarity within Knowledge Graphs”, Big Data Analytics: Tools, Technology for Effective Planning, CRC Press. https://www.researchgate.net/publication/321716589_Large-Scale_Entity_Clustering_Based_on_Structural_Similarity_within_Knowledge_Graph
Implementation in Altran for Rational Function Integration and Polynomial Factorization
No full textTitle: Implementation in Altran for Rational Function Integration and Polynomial Factorization , Author: Mahmoud M. Makhlouf, Location: ThodeThis project is a study involving the application of the ALTRAN system to rational function integration. A discussion and the implementation of two methods are given, one by Hermite [HER 12] and a second by Horowitz [HOR 70]. Included is a brief discussion of the integration of the transcendental part over the rational field using polynomial factorization over the integers. Furthermore, an extension for multivariate rational function integration and
multivariate polynomial factorization is included.ThesisMaster of Science (MS
AUTHOR CORRECTION - ERS International Congress 2019:highlights from Best Abstract awardees
Get PDFLorna E. Latimer, Marieke Duiverman, Mahmoud I. Abdel-Aziz, Gulser Caliskan, Sara M. Mensink-Bout, Alberto Mendoza-Valderrey, Aurelien Justet, Junichi Omura, Karthi Srikanthan, Jana De Brandt. Breathe 2019; 15: e143–e149. This article from the December 2019 issue of Breathe was published with an error in the name of one of the authors. The corrected author list is shown above. The article has been corrected and republished online.</p
Engineering and Management Experience at Texas A&M Transportation Institute
Get PDFThis manuscript presents the author���s engineering and management experience during his internship in the Materials and Pavements (M&P) Division at the Texas A&M Transportation Institute (TTI), and is a record of study for the Doctor of Engineering at Texas A&M University. Through this internship, he met his established internship objectives of gaining technical knowledge as well as knowledge and skills in project management, organizational communication, and quality management of pavement condition data, and of attaining professional development.
In meeting these objectives, the author describes the history, mission, and organizational structure of his workplace. He also presents his experience of developing and delivering a two-week training course on pavement design and construction in Kosovo. Participating in a number of professional development training courses and other activities prepared him for working as an engineering manager. These activities include Delta-T leadership training, an instructor development course, a time management and organizational skills course, and the M&P Division lecture series. Leadership and skills learned through the Delta-T program were beneficial for the employee as well as the employer. For the class project, the author and his teammates performed a study dealing with improving TTI���s deliverables. The Delta-T team composed a report summarizing their efforts of examining the current state of TTI���s project deliverables, the deliverables��� shortcomings, and potential enhancements to expand the deliverables��� appeal to additional types of potential users outside the traditional research community. The team also developed a prototype web-based model of deliverables and presented some implementation recommendations.
Participating in the Texas Department of Transportation���s (TxDOT���s) pavement surface distress data collection program enabled the author to become familiar with pavement distress data quality management and thus attain the technical and nontechnical skills required for project management. He noticed some areas for improvement in TxDOT���s rater���s manual, rater���s training class, and acceptance criteria for visual distress data
An investigation of misinformation and production control implementation sequence using discrete linear control
No full textDiscrete linear control theory is used in this research to examine the effects
of system choice and data errors on the performance of production control
systems. Two common information flow systems are modelled. These are
the Reorder Cycle (ROC) and the Material Requirements Planning (MRP)
systems. System choices include the choice of forecasting method, the
choice of delivery policy, and the choice of inventory rule. The source of
data errors include stock recording errors, delay in stock recording,
incorrect bills of material.
The other part of the research examines the sequence of implementing a
new production control system. Different ways of moving from a Reorder
Cycle to a Material Requirements Planning system are studied. Guidelines
for an implementation sequence are produced
Efficient and Linear CMOS Power Amplifier and Front-end Design for Broadband Fully-Integrated 28-GHz 5G Phased Arrays
Get PDFDemand for data traffic on mobile networks is growing exponentially with time and on a global scale. The emerging fifth-generation (5G) wireless standard is being developed with millimeter-wave (mm-Wave) links as a key technological enabler to address this growth by a 2020 time frame. The wireless industry is currently racing to deploy mm-Wave mobile services, especially in the 28-GHz band. Previous widely-held perceptions of fundamental propagation limitations were overcome using phased arrays. Equally important for success of 5G is the development of low-power, broadband user equipment (UE) radios in commercial-grade technologies. This dissertation demonstrates design methodologies and circuit techniques to tackle the critical challenge of key phased array front-end circuits in low-cost complementary metal oxide semiconductor (CMOS) technology. Two power amplifier (PA) proof-of-concept prototypes are implemented in deeply scaled 28- nm and 40-nm CMOS processes, demonstrating state-of-the-art linearity and efficiency for extremely broadband communication signals. Subsequently, the 40 nm PA design is successfully embedded into a low-power fully-integrated transmit-receive front-end module.
The 28 nm PA prototype in this dissertation is the first reported linear, bulk CMOS PA targeting low-power 5G mobile UE integrated phased array transceivers. An optimization methodology is presented to maximizing power added efficiency (PAE) in the PA output stage at a desired error vector magnitude (EVM) and range to address challenging 5G uplink requirements. Then, a source degeneration inductor in the optimized output stage is shown to further enable its embedding into a two-stage transformer-coupled PA. The inductor helps by broadening inter-stage impedance matching bandwidth, and helping to reduce distortion. Designed and fabricated in 1P7M 28 nm bulk CMOS and using a 1 V supply, the PA achieves +4.2 dBm/9% measured Pout/PAE at ���25 dBc EVM for a 250 MHz-wide, 64-QAM orthogonal frequency division multiplexing (OFDM) signal with 9.6 dB peak-to-average power ratio (PAPR). The PA also achieves 35.5%/10% PAE for continuous wave signals at saturation/9.6dB back-off from saturation. To the best of the author���s knowledge, these are the highest measured PAE values among published K- and K a-band CMOS PAs to date.
To drastically extend the communication bandwidth in 28 GHz-band UE devices, and to explore the potential of CMOS technology for more demanding access point (AP) devices, the second PA is demonstrated in a 40 nm process. This design supports a signal radio frequency bandwidth (RFBW) >3�� the state-of-the-art without degrading output power (i.e. range), PAE (i.e. battery life), or EVM (i.e. amplifier fidelity). The three-stage PA uses higher-order, dual-resonance transformer matching networks with bandwidths optimized for wideband linearity. Digital gain control of 9 dB range is integrated for phased array operation. The gain control is a needed functionality, but it is largely absent from reported high-performance mm-Wave PAs in the literature. The PA is fabricated in a 1P6M 40 nm CMOS LP technology with 1.1 V supply, and achieves Pout/PAE of +6.7 dBm/11% for an 8��100 MHz carrier aggregation 64-QAM OFDM signal with 9.7 dB PAPR. This PA therefore is the first to demonstrate the viability of CMOS technology to address even the very challenging 5G AP/downlink signal bandwidth requirement.
Finally, leveraging the developed PA design methodologies and circuits, a low power transmit-receive phased array front-end module is fully integrated in 40 nm technology. In transmit-mode, the front-end maintains the excellent performance of the 40 nm PA: achieving +5.5 dBm/9% for the same 8��100 MHz carrier aggregation signal above. In receive-mode, a 5.5 dB noise figure (NF) and a minimum third-order input intercept point (IIP���) of ���13 dBm are achieved. The performance of the implemented CMOS frontend is comparable to state-of-the-art publications and commercial products that were very recently developed in silicon germanium (SiGe) technologies for 5G communication
New and renewable energy and environmental engineering
Get PDFThere is an acute scarcity of potable water in many parts of the world, and especially in most of the Middle East region. Important advances have been made in desalination technology but its wide application is restricted by relatively high capital and input energy costs, even when solar energy is used. Until recently, flat-plate solar collectors have usually been employed to distill water in compact desalination systems. Currently, it is possible to replace these collectors by the more advanced evacuated tube collectors, which are now available on the market at a similar price. The research which is concerned with the development of a novel small scale solar water desalination technology, consists of experimental and theoretical investigations of the operation of a multi stage solar still desalination system coupled with a heat pipe evacuated tube solar collector with an aperture area of about 1.7 m(^2). The multi stage still was tested to recover latent heat from the evaporation and condensation processes in each of its four stages. A number of experimental tests were carried out using a laboratory rig to investigate its water production capacity. Solar radiation (insolation) during a mid-summer day in the Middle East region was simulated by an array of 110 halogen flood lights. Computational Fluid Dynamics (CFD) modeling of the evaporation and condensation processes in one of the still's stages was conducted using FLUENT 6.2 software. The simulation results demonstrate the importance of the various parameters affecting the total production rate of the solar still and provide detailed information on the temperature distribution and condensate formation inside the solar still. However, it was found that the CFD technique at this stage does not provide accurate quantitative predictions and results obtained can be used only for qualitative analysis. Hence, the use of a lumped parameter mathematical model was preferred for analysis and design purpose. A lumped parameter model has been developed to describe the system's operation. It consists of a system of ordinary differential equations of energy and mass conservation written for each stage of the still. A MATLAB computer program was written to solve the system of governing equations to simulate the evaporation and condensation processes and the experimental results were used to validate numerical predictions. The experimental and theoretical values for the total daily distillate output were found to be closely correlated. The test results demonstrate that the system produces about 9 kg of clean water per day and has a distillation efficiency of 90%. The overall efficiency is 33% due to the presence of heat losses in the system. However, this level of efficiency is greater of that for conventional solar stills. Following the experimental calibration of the lumped parameter model, this was used for determination of rational design parameters of the still and it was demonstrated that the performance of the system could be considerably improved to produce 11 kg/m(^2) of water per day if the number of stages and evaporation area were 4 and 1 m(^2), respectively. A water quality analysis was performed for the distilled water and the levels of total dissolved solids, electrical conductivity and pH were well within the range defined by the World Health Organization guidelines for drinking water. An economic study was also conducted for the system and it was shown that the distilled water costs of 0.016 US$/litre with a payback period of 6 months in the Middle East region conditions. This research demonstrates, empirically and theoretically, the potential role in the field of solar desalination of the multistage solar still coupled to the evacuated tube solar collector. Not only is this system a promising new technology but it could prove to be particularly appropriate in remote and rural areas. Simultaneously this system also uses a completely clean energy source and contributes to tackling environmental pollution, global carbon emissions and climate change problems
Jerusalem – an independent being – a portrait of the city in Mahmoud Shukair’s novel Jerusalem Stands Alone
No full textIn his novel Jerusalem Stands Alone, a Palestinian writer, Mahmoud Shukair, pays homage to his home city. Jerusalem is teeming with uninterrupted life, overwhelmed by the past’s facts and experiences. While observing the urban space, apart from the places of religious worship and historical monuments, the author notices the people. It is about them, for them, that Shukair dedicates 155 short stories – vignettes. Each story is a separate tale; through them, the author evokes the sights, sounds, and smells of ancient and modern Jerusalem.JOANNA WILDOWICZ – dr nauk humanistycznych; lektorka w Studium Praktycznej Nauki Języków Obcych na Wydziale Filologicznym Uniwersytetu w Białymstoku; absolwentka Nauczycielskiego Kolegium Języka Angielskiego na Uniwersytecie Warszawskim (Filia w Białymstoku); magisterium pod opieką prof. Cynthi Dominik na podstawie pracy: American values reflected in situation comedies (Ośrodek Studiów Amerykańskich, Uniwersytet Warszawski). Była
studentką stacjonarnych studiów doktoranckich w zakresie literaturoznawstwa na Wydziale Filologicznym UwB, gdzie obroniła rozprawę doktorską poświęconą twórczości Cormaca McCarthy’ego i jego roli w zachowanie ukształtowanych
postaw społecznych i kulturowych Ameryki. Autorka m.in. artykułu Strażnik pogranicza (2016). Współredaktorka tomu Żydzi wschodniej Polski, Seria VIII: Artyści żydowscy, Białystok 2020.Uniwersytet w BiałymstokuGoldhill S., Jerusalem, City of Longing, London 2008.Leśniewski S., Jerozolima 1099, Warszawa 2007.Montefiore S. S., Jerusalem, New York 2011.Shukair M., Jerusalem Stands Alone, New York 2018.9910
Corrosion performance of carbon steel in N-doped mesoporous carbon spheres (NMCS)-containing alkaline medium in presence of chloride
No full textThe electrochemical response of carbon steel in chloride-free or chloride-containing 0.1 M and 0.9 M NaOH, in the presence of 0.016 wt.% NMCS, is the subject of this work. The NMCS exhibited a negative (in 0.1 M NaOH) and positive (in 0.9 M NaOH) zeta-potential. This determined altered steel electrochemical response, improved overall, especially in chloride-containing 0.9 M NaOH. The effect was related to an enhanced Fe3+ contribution in the passive film, when NMCS were present. The improved corrosion resistance was also attributable to a NMCS-triggered competition of OH− vs. Cl− ions in the medium, in other words, NMCS interference to promote passive layer stability.Else Kooi Laborator
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