Готові списки джерел за темами / PHEME

Добірка наукової літератури з теми "PHEME"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "PHEME"

1

West, Donna E. "The Operation of Peirce’s Pheme in Narrative Contexts." Contemporary Pragmatism 19, no. 4 (August 4, 2022): 331–49. http://dx.doi.org/10.1163/18758185-bja10051.

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Abstract Peirce’s Pheme directs interpretation of narratives via a “series of surprises” (ep2:154). The indexical and iconic elements inherent in Phemes are particularly potent in forcing attention and depicting relevant events. Index intrudes upon interpreters’ consciousness to notice the unexpected consequence; but icons exploit vividness. As imperatives, Phemes compel particular behaviors (1906: ms295). When narratives are portrayed in pictures, interpreters remember happenings in which Phemes feature surprising percepts, evoking an attentional response, and securing a confluence of events in memory. Findings from children’s narrations demonstrate that events represented by Phemes are more often included in children’s retellings, because surprising images command active participation. This viewpoint impels listeners to build episodes, ascribing meanings across events, and proposing rationale for novel outcomes.
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2

Williams, Michael A. "Gnosticism and the New Testament. Pheme Perkins." Journal of Religion 75, no. 4 (October 1995): 555–57. http://dx.doi.org/10.1086/489690.

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3

Martin, Troy W. "Peter: Apostle for the Whole Church. Pheme Perkins." Journal of Religion 82, no. 1 (January 2002): 107–8. http://dx.doi.org/10.1086/491003.

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4

Hernandez-Mendoza, Maria, Ana Aguilera, Irvin Dongo, Jose Cornejo-Lupa, and Yudith Cardinale. "Credibility Analysis on Twitter Considering Topic Detection." Applied Sciences 12, no. 18 (September 9, 2022): 9081. http://dx.doi.org/10.3390/app12189081.

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Twitter is one of the most popular sources of information available on the internet. Thus, many studies have proposed tools and models to analyze the credibility of the information shared. The credibility analysis on Twitter is generally supported by measures that consider the text, the user, and the social impact of text and user. More recently, identifying the topic of tweets is becoming an interesting aspect for many applications that analyze Twitter as a source of information, for example, to detect trends, to filter or classify tweets, to identify fake news, or even to measure a tweet’s credibility. In most of these cases, the hashtags represent important elements to consider to identify the topics. In a previous work, we presented a credibility model based on text, user, and social credibility measures, and a framework called T-CREo, implemented as an extension of Google Chrome. In this paper, we propose an extension of our previous credibility model by integrating the detection of the topic in the tweet and calculating the topic credibility measure by considering hashtags. To do so, we evaluate and compare different topic detection algorithms, to finally integrate in our framework T-CREo, the one with better results. To evaluate the performance improvement of our extended credibility model and show the impact of hashtags, we performed experiments in the context of fake news detection using the PHEME dataset. Results demonstrate an improvement in our extended credibility model with respect to the original one, with up to 3.04% F1 score when applying our approach to the whole PHEME dataset and up to 9.60% F1 score when only considering tweets that contain hashtags from PHEME dataset, demonstrating the impact of hashtags in the topic detection process.
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5

Mba, Jean Romuald, Djamila Zouheira, Hadidjatou Dairou, Fanta S. A. Yadang, Nfor Njini Gael, Lawrence Ayong, Jules-Roger Kuiate, and Gabriel A. Agbor. "In Vitro Antioxidant, Anti-Inflammatory, and Digestive Enzymes Inhibition Activities of Hydro-Ethanolic Leaf and Bark Extracts of Psychotria densinervia (K. Krause) Verdc." Advances in Pharmacological and Pharmaceutical Sciences 2022 (May 6, 2022): 1–12. http://dx.doi.org/10.1155/2022/8459943.

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Psychotria densinervia hydro-ethanolic leaf extract (PHELE) and bark extract (PHEBE) were evaluated for antioxidant, anti-inflammatory, and inhibition of digestive enzymes activities. The antioxidant activity was characterized by 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), ferric reducing antioxidant power (FRAP), total phenolic content (TPC), and total flavonoid content (TFC) assays. The anti-inflammatory activity was characterized by protein denaturation and antiproteinase tests, while the inhibition of the enzymes was assessed using α-amylase, α-glucosidase, lipase, and cholesterol esterase activities. PHELE presented low ( p < 0.001 ) IC50 (59.09 ± 5.97 μg/ml) for DPPH compared with ascorbic acid (71.78 ± 6.37 μg/ml) and PHEBE (115.40 ± 1.21 μg/ml). The IC50 of PHELE (262.4 ± 4.46 μg/ml) and PHEBE (354.2 ± 1.97 μg/ml) was higher ( p < 0.001 ) than that of catechin (33.48 ± 2.02 μg/ml) for ABTS. PHELE had high ( p < 0.001 ) FRAP (341.73 ± 21.70 mg CE/g) than PHEBE (150.30 ± 0.32 mg CE/g). PHELE presented ( p < 0.001 ) high TPC (270.05 ± 7.53 mg CE/g) and TFC (23.43 ± 0.032 mg CE/g) than PHEBE (TPC: 138.89 ± 0.91 and TFC: 20.06 ± 0.032 mg CE/g). PHELE showed antiprotein denaturation with IC50 (257.0 ± 7.51 μg/ml) ( p < 0.001 ) and antiproteinase activity (74.37 ± 1.10 μg/ml) lower than PHEBE (316.1 ± 6.02 μg/ml and 177.6 ± 0.50 μg/ml), respectively. Orlistat inhibited lipase ( p < 0.001 ) activity with IC50 (37.11 ± 4.39 μg/ml) lower than PHELE and PHEBE (50.57 ± 2.89 μg/ml and 62.88 ± 1.74 μg/ml, respectively). PHELE inhibited cholesterol esterase with IC50 (34.75 ± 3.87 μg/ml) lower than orlistat (54.61 ± 2.56) and PHEBE (80.14 ± 1.71 μg/ml). PHELE inhibited α-amylase IC50 (6.07 ± 4.05 μg/ml) lower than PHEBE (19.69 ± 6.27 μg/ml) and acarbose (20.01 ± 2.84 μg/ml). Acarbose inhibited α-glucosidase ( p < 0.001 ) activity with IC50 (4.11 ± 3.47 μg/ml) lower than PHELE (24.41 ± 2.84 μg/ml) and PHEBE (38.81 ± 2.46 μg/ml). PHELE presented better antioxidant, anti-inflammatory, and enzyme inhibition activity than PHEBE.
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6

Kiran, Sirra Kanthi, M. Shashi, and K. B. Madhuri. "Multi-stage Transfer Learning for Fake News Detection Using AWD-LSTM Network." International Journal of Information Technology and Computer Science 14, no. 5 (October 8, 2022): 58–69. http://dx.doi.org/10.5815/ijitcs.2022.05.05.

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Анотація:
In the recent decades, the automatic veracity verification of rumors is essential, since online social media platforms allow users to post news item or express opinion towards a circulating piece of information without much restriction. The intention of fake news is to make the readers believe in inaccurate information, where the detection of fake news by using content is a difficult task. So, the auxiliary information: user profile, social engagement of the users, and other user’s comments are useful in the detection of fake news. In this manuscript, a novel multi-stage transfer learning approach is introduced for an effective fake news detection, where it utilizes user’s comments as auxiliary information to detect whether the given tweet is true or false. The stances of the response tweets contain opinions on news/rumors are often used for verifying the veracity of the circulating information. In order to devastate the effects of the specific rumors at the earliest, the multi-stage transfer learning approach automatically predict veracity of rumors jointly with the stances of their response tweets. The proposed multi-stage transfer learning is an inductive transfer learning variation that is used to forecast the stance of responses, then to identify fake news. The proposed model’s effectiveness is evaluated on the two-benchmark datasets: semEval-2017 task 8 and PHEME. The proposed model outperformed the existing approaches by obtaining a classification accuracy of 64.30% and 65.30%, an F-measure of 65.95% and 63.90% on semEval-2017 task 8, and PHEME on event-wise datasets.
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7

Qian, Xiaohong. "A Tentative Study on English Euphemism." Journal of Contemporary Educational Research 4, no. 2 (February 19, 2020): 9–12. http://dx.doi.org/10.26689/jcer.v4i2.1010.

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The word “euphemism” comes from the Greek, eu--means “good”, and –pheme-, “speech” or “saying”, and together it means literally “to speak with good words or in a pleasant manner”. Euphemism, as a cultural phenomenon as well as a linguistic concept, has attracted people’s attention for a long time. It has long been a topic of much interest. In every society there are certain things that are supposed to be unspeakable. Many words make someone embarrassed, unhappy, dislike or fear when used in communication. If we express the meaning directly, we will make such impression which is vulgar, frivolous, and impolite. In order to avoid the embarrassment or ease the sting of harsh words, man has created euphemisms.
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8

Ningtias, Anggitha, Rosidah, and Yuandani. "Poguntano Herba Extract Immunostimulant Activities (Picriafel-terraeLour). in Immunosupression Rats Infected by Staphylococcus aureus Against Total Leukocytes and Differential Leukocytes." Indonesian Journal of Pharmaceutical and Clinical Research 4, no. 1 (May 28, 2021): 39–46. http://dx.doi.org/10.32734/idjpcr.v4i1.5378.

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Poguntano (Picriafel-terraeLour.) is a medicinal plant in North Sumatra that has been used in traditional medicine to treat degenerative diseases.Poguntano extract contains flavonoid compounds that have the potential to be developed into immunomodulators. This study showed the immunostimulant activity of poguntano herb n-hexane extract (PHNHE), poguntano herb ethyl acetate extract (PHEAE) and poguntano herb ethanol extract (PHEE) in immunosuppressed rats infected with Staphylococcus aureus. The evidence of poguntano herb as an immunomodulator was carried out by testing total leukocytes and differential leukocytes. Poguntano herb n-hexane extract (PHNHE) can not increase the total and differential leukocytes; Poguntano herb ethyl acetate extract (PHEAE) and poguntano herb ethanol extract (PHEE) can increase the total and differential leukocytes in immunosuppressed rats induced by Staphylococcus aureus.
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9

Rogerson, J. W. "Resurrection. New Testament Witness and Contemporary Reflection. By Pheme Perkins. London, Geoffrey Chapman, 1984. Pp. 504. £19.95." Scottish Journal of Theology 39, no. 2 (May 1986): 243–44. http://dx.doi.org/10.1017/s0036930600030581.

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10

Suthanthiradevi, P., and S. Karthika. "Veracity assessment by single and multi-source identification algorithms during the crisis." Journal of Intelligent & Fuzzy Systems 42, no. 3 (February 2, 2022): 1421–31. http://dx.doi.org/10.3233/jifs-210540.

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Анотація:
Social networks have become a popular communication tool for information sharing. Twitter offers access to data and provides a significant opportunity to analyze data. During pandemics, Twitter becomes a big source for the dispersal of unverified information. In social media, it is difficult to find the sources of rumors. To tackle this problem the authors have developed a hybrid rumor centrality algorithm for rumor source detection in social networks. The authors propose an S-RSI algorithm for identifying a single rumor centre and an M-RSI algorithm for identifying the propagations of multiple rumor centres in the thread of conversation. The proposed rumor centrality algorithm efficiently predicts the rumor disseminating possibilities in a conversation tree with the aid of graph theoretical approach. The authors have evaluated the performance of the algorithms on the PHEME dataset containing seven real-time event conversational trees based on the tweet messages. The results show that the proposed is best suitable in finding the rumor source centre with a high probability in social media during a crisis.
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Більше джерел

Дисертації з теми "PHEME"

1

Basson, Willem Diederick. "Improving Grapheme-based speech recognition through P2G transliteration / W.D. Basson." Thesis, North-West University, 2014. http://hdl.handle.net/10394/11068.

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Анотація:
Grapheme-based speech recognition systems are faster to develop, but typically do not reach the same level of performance as phoneme-based systems. Using Afrikaans speech recognition as a case study, we first analyse the reasons for the discrepancy in performance, before introducing a technique for improving the performance of standard grapheme-based systems. It is found that by handling a relatively small number of irregular words through phoneme-to-grapheme (P2G) transliteration – transforming the original orthography of irregular words to an ‘idealised’ orthography – grapheme-based accuracy can be improved. An analysis of speech recognition accuracy based on word categories shows that P2G transliteration succeeds in improving certain word categories in which grapheme-based systems typically perform poorly, and that the problematic categories can be identified prior to system development. An evaluation is offered of when category-based P2G transliteration is beneficial and methods to implement the technique in practice are discussed. Comparative results are obtained for a second language (Vietnamese) in order to determine whether the technique can be generalised.
MSc (Computer Science) North-West University, Vaal Triangle Campus, 2014
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2

Casadio, Ylenia Silvia. "Biodegradable PHEMA-based biomaterials." University of Western Australia. School of Biomedical, Biomolecular and Chemical Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0173.

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[Truncated abstract] The synthetic hydrogel poly(2-hydroxyethyl methacrylate) (PHEMA) has been used as a biocompatible biomaterial in ocular devices, such as soft contact lenses, intraocular lenses and an artificial cornea. Due to its favourable properties as an already established (but non-biodegradable) biomaterial, PHEMA is an interesting candidate for use as a material for scaffolds in tissue engineering. A tenant of tissue engineering scaffolds is obtaining the appropriate porous morphology to allow for successful cellular attachment and support. PHEMA hydrogels exhibit varied morphological features, which range from non-porous (homogeneous) to macroporous (heterogeneous) and can be readily obtained by fine-tuning the polymerisation conditions. A desirable feature for matrices that are to be used as tissue supports is the ability to biodegrade in a biological environment. This thesis describes the preparation and enzymatic biodegradation behaviour of novel porous PHEMA hydrogels that have been crosslinked with biodegradable peptide-based crosslinking agents. Peptide-based crosslinking agents were designed to contain two terminal polymerisable groups flanking an internal biodegradable backbone. This backbone was specifically designed to be targeted by the proteolytic enzyme papain. The general design template allowed for the development of a synthetic methodology that was readily implemented for the production of a range of olefin-peptide conjugates. A suite of olefin-peptide conjugates of general structure I were synthesised, characterised and further tested with papain to determine their biodegradation properties. ... The second strategy for producing bioresorbable degradation fragments involved the incorporation of the highly hydrophilic comonomer, poly(ethylene glycol) PEG into the PHEMA backbone. The addition of PEG to PHEMA resulted in the formation of homogeneous hydrogels that had an improved hydrophilicity compared to their heterogeneous PHEMA counterparts. The synthetic conditions for the preparation of PHEMA and PHEMA-co-PEG hydrogels by photoinitiated polymerisation were thoroughly investigated. It was found that the pore morphology and general properties (non-porous to macroporous) of these hydrogels could be controlled by the appropriate choice of polymerisation conditions. The hydrogels were characterised by scanning electron microscopy, thermal gravimetric analysis and differential scanning calorimetry. The peptide-based crosslinking agents were successfully co-polymerised with the HEMA and PEGMA via photoinitiated polymerisation to provide a range of PHEMA and PHEMA-co-PEG hydrogels that displayed both homogeneous and heterogeneous hydrogel properties. The final crosslinked hydrogels were characterised by scanning electron microscopy and were subjected to enzymatic hydrolysis. The PHEMA-peptide conjugate hydrogels proved to be biodegradable, with degradation behaviour dependent on the hydrogel formulation and the length of the peptide-based crosslinking agent.
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3

Bennett, Darrell Jonathan. "Properties of crosslinked phema hydrogels /." Title page, contents and introduction only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phb4713.pdf.

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4

Haris, Norshakila. "Three-dimensional multilayer integration and characterisation of CPW MMIC components for future wireless communications." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/threedimensional-multilayer-integration-and-characterisation-of-cpw-mmic-components-for-future-wireless-communications(89ddea33-4de2-43ba-b8dc-dbc032b868e7).html.

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The development of monolithic microwave integrated circuits (MMICs) has enabled the expansion of multiple circuit elements on a single piece of semiconductor, enclosed in a package with connecting leads. Attributable to the widespread use of wireless circuits and sub-systems, MMICs meet stringent demands for smaller chip area, low loss and low cost. These require highly integrated MMICs with compact features. This thesis provides valuable insight into the design of compact multifunctional MMICs using three-dimensional (3-D) multilayer technology. The proposed technology offers compact, hence low-cost solutions, where all active and passive components are fabricated vertically on the same substrate and no expensive via hole or backside processing is required. The substrate used in this work contains pre-fabricated 0.5 µm pseudomorphic High Electron Mobility Transistor (pHEMT) GaAs active devices. The performances of the uncommitted and committed pHEMTs are compared in terms of their DC, small-signal and large-signal RF measurements and modelling results. Committed pHEMT refers to the pHEMT that is connected to multilayer circuit, whereas uncommitted pHEMT is not. The effect of integrating committed pHEMTs with multilayer passive components is studied and the suitability of the multilayer fabrication processing is assessed. Using this technology, two pHEMT Schottky diodes with 120 µm and 200 µm gate widths are designed, fabricated and extensively characterised by I-V, C-V and S-parameter measurements. The information gained from the measurements is then used to extract all unknown equivalent circuit model parameters using high-frequency on-wafer microwave probing. The measured results showed good agreement with the modelled ones over the frequency range up to 40 GHz. Preliminary demonstrations of the use of these pHEMT Schottky diodes in microwave limiter and detector circuit applications are also discussed, showing promising results. Finally, the implementation of 3-D multilayer technology is shown for the first time in single-pole single-throw (SPST) and single-pole double-throw (SPDT) switches design by utilising the pre-fabricated pHEMTs. The design and analysis of the switches are demonstrated first through simulation using TriQuint's Own Model - Level 3 (TOM3). Three optimised SPST and SPDT pHEMT switching circuits which can address applications ranging from L to X bands are successfully fabricated and tested. The performance of the pHEMT switches is comparable to those of the current state-of-the-art, while simultaneously offering compact circuits with the advantages of integration with other MMIC components. All works reported in this thesis should facilitate foundry design engineers towards further development of 3-D multilayer technology.
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5

Béland, Paul. "Millimeter-wave noise characterization of PHEMT devices." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq26300.pdf.

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6

Seng, Hing Weng. "Exploitation of phemt in microwave power limiters." Thesis, University of Manchester, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.594759.

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This thesis describes the design and the study of implementing microwave power limiters with Gallium Arsenide (GaAs) pseudomorphic high electron mobility transistors (PHEMTs). Circuits were fabricated in microwave integrated circuits (MICs) and monolithic microwave integrated circuits (MMICs) format, tested for performance at 2GHz and 10GHz respectively. The majority of microwave power limiters offered in the current market are based on the p-i-n or PIN diode for protection. Generally in the RF industries, very high power applications still utilize solid-state devices such as T-R tubes for power limiters due to their electrical robustness. However, with the ever growing urge for product improvements and the maturity of MMICs, the lack of integration of the PIN diodes with MMICs calls for an investigation into alternate approaches in power limiter design. Many switching applications in MMICs are implemented using pHEMTs in both series and shunt orientation. The Schottky diode is the favoured choice for microwave power detection purposes. The microwave power limiter approach suggested in this thesis utilizes the pHEMTs as a voltage controlled attenuator in conjunction with a Schottky diode based detector as the control voltage supplier. The MICs or hybrids have been designed using Avago's general purpose pHEMT ATF-35143 as the major element in the voltage controlled switch attenuator sub circuit. The voltage controlled attenuator is supplied with a control voltage from a detector or combination of detector and external bias, depending on the switch's configuration. Avago's Schottky diode HSMS-8101 was used as the detector diode in the power detecting sub circuit. The MMICs were designed using the FD05 O.251lm pHEMT process design kit from Filtronic Compound semiconductor PLC, Newton Aycliffe, Durham, United Kingdom. The pHEMT epi-layers were grown by molecular beam epitaxy on 150mm semi-insulating substrates, featuring O.51lm gate length and 50llm gate width. It is found that larger device provides lower loss but lower isolation. The Schottky diode used in fabricated MMICs is a single gate and 20llm wide device. In the design approach adopted here, the junction of the voltage controlled attenuator and detector is realized using aT-junction. Other methods used include the proximity coupler and capacitive power divider network. Each coupling method finds merit depending on the switch configuration of the attenuator. Eight types of MIC limiters were made, including the single series switch, double series switch, single shunt switch, double shunt switch, series-shunt switch, shunt-series switch, n-switch and tee-switch limiters. The lowest insertion loss achieved was -O.34dB while the isolation is 8dB, delivered by the single shunt switch, measured at 2GHz. The best isolation measured was 20dB, seen in the tee-switch and the double series switch limiters. From the fabricated MMIC limiters, 3.03dB insertion loss and 15dB isolation is provided by the single series switch limiter. While the double series switch limiter is seen to deliver 5.25dB insertion loss and 25dB isolation. Both MMIC limiters exhibit the same limiting threshold level at 10dBm on X-band.
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7

Jasper, David Brian. "RF pHEMT Switch Model for Multiband Cell Phone Circuits." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-11032004-220504/.

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Анотація:
Simulation of Radio Frequency Switches used in the cellular phone industry is the main focus of this study. The RF pHEMT?s used in an antenna switch for multiband cell phone circuits requires the use of an accurate model during simulation of the RF system. The pHEMT model extracted in this study utilizes theoretical methods within the extraction software and an analysis of simulated data and measured data. This study describes the techniques of calibration, model extraction, and data analysis.
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8

Martins, Everson. "Projeto de misturador com topologia celula de Gilbert utilizando pHEMT." [s.n.], 2002. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260267.

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Анотація:
Orientador : Jacobus Willibrordus Swart
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-02T16:34:04Z (GMT). No. of bitstreams: 1 Martins_Everson_D.pdf: 3796280 bytes, checksum: 4544421a0e4b0024a8f27ca0c269ac7c (MD5) Previous issue date: 2002
Doutorado
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9

Mat, Jubadi Warsuzarina. "Modelling of advanced submicron gate InGaAs/InAlAs pHEMTs and RTD devices for very high frequency applications." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/modelling-of-advanced-submicron-gate-ingaasinalas-phemts-and-rtd-devices-for-very-high-frequency-applications(4688a951-f235-4720-93e4-441eabcce44a).html.

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Анотація:
InP-based InAlAs/InGaAs pseudomorphic High Electron Mobility Transistors (pHEMTs) have shown outstanding performance; this makes them prominent in high frequency mm-wave and submillimeter-wave applications. However, conventional InGaAs/InAlAs pHEMTs have major drawbacks, i.e., very low breakdown voltage and high gate leakage current. These disadvantages degrade device performance, especially in Monolithic Microwave Integrated Circuit (MMIC) low noise amplifiers (LNAs). The optimisation of InAlAs/InGaAs epilayer structures through advanced bandgap engineering offers a key solution to the problem. Concurrently, device modelling plays a vital role in the design and analysis of pHEMT devices and circuit performance. In this research, two-dimensional (2D) physical modelling of 1 m and sub-micro metre gate length strained channel InAlAs/InGaAs/InP pHEMTs has been developed, in ATLAS Silvaco. All modelled devices were optimised and validated by experimental devices, which were fabricated at the University of Manchester. An underlying device physics insight is gained, i.e., the effect of changes to the device's physical structure, theoretical concepts and its general operation, and a reliable pHEMT model is obtained. The kink anomalies in the I-V characteristics were reproduced. The 2D simulation results demonstrate an outstanding agreement with measured DC and RF characteristics. The aim of developing linear and non-linear models for sub-micro metre transistors and their implementation in MMIC LNA design is achieved with the 0.25 m In0.7Ga0.3As/In0.52Al0.48As/InP pHEMT. An accurate method for the extraction of empirical models for the fabricated active devices has been developed, and optimised using the Advance Design System (ADS) software. The results demonstrate excellent agreement between experimental and modelled DC and RF data. Precise models for MMIC passive devices are also obtained, and incorporated in the proposed design for a single- and double-stage MMIC LNAs at C- and X-band frequencies. The single-stage LNA is designed to achieve a maximum gain ranging from 9 to 13 dB over the band of operation, while the gain is increased to between 20 dB and 26 dB for the double-stage LNA designs. A noise figure of less than 1.2 dB and 2 dB is expected, for the C- and X-band LNAs respectively, while retaining stability across all frequency bands. Although the RF performance of pHEMT is being vigorously pushed towards the terahertz (THz) region, novel devices such as the Resonant Tunnelling Diode (RTD) are needed to support future ultra-high-speed, high-frequency applications. Hence, the study of physical modelling is extended to quantum modelling of an advanced In0.8Ga0.2As/AlAs RTD device. The aim is to effectively model both large-size and submicron RTDs, using Silvaco's ATLAS software to reproduce the peak current density, peak-to-valley-current ratio (PVCR), and negative differential resistance (NDR) voltage range. The physical modelling for the RTD devices is optimised to achieve an excellent match with the fabricated RTD devices; variations in the spacer thickness, barrier thickness, quantum well thickness and doping concentration are included.
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10

Lorenzetti, Solange Gubbelini. ""Obtenção dos sistemas bioconjugados Crotoxina/PEBD-g-Phema e Crotoxina/PCL"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-08062007-132650/.

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A finalidade deste trabalho de pesquisa foi a obtenção de matrizes poliméricas imobilizadas com a crotoxina, proveniente do veneno bruto de cascavel. Foram obtidas duas matrizes: (a) copolímero de enxerto para a imobilização da crotoxina, (b) micro-esferas de épisolon-policaprolactona (PCL) com crotoxina encapsulada. A crotoxina, proveniente da serpente Crotalus durissus terrificus (cascavel da América do Sul), após a sua purificação, foi caracterizada bioquímica e biologicamente. O resultado da avaliação da dose letal média (DL50) da toxina foi de 0,09mg/Kg de animal. O teste de citotoxicidade apresentou resultados semelhantes entre as células tumorais e os respectivos controles das células normais. Copolímeros de polietileno de baixa densidade enxertado com poli(metacrilato de 2-hidroxietila) (PEBD-g-PHEMA) foram utilizados como suportes para a imobilização química da crotoxina purificada. Para tal utilizou-se o polietileno de baixa densidade (PEBD) juntamente com o monômero hidrofílico metacrilato de 2-hidroxietila (HEMA). Os copolímeros foram obtidos via radiação ionizante, em fonte de cobalto 60 (60Co), e apresentaram graus de enxertia que variaram de 2 a 50%. Na caracterização por espectroscopia em infravermelho (ATR) observou-se os grupos funcionais principais do copolímero, em relação ao polímero base e PHEMA formado na irradiação. No perfil espectroscópico do copolímero estavam presentes bandas atribuídas aos grupos C=O (carbonila) e –OH (hidroxil), provenientes do homopolímero PHEMA. As micrografias do MEV do PEBD apresentaram superfícies lisas, enquanto que PEBD-g-PHEMA com alto grau de enxertia (32 %) revelou superfície rugosa devido à presença de PHEMA. O copolímero foi caracterizado fisicamente com o teste de hidrofilicidade, no qual o conteúdo de água foi determinado gravimetricamente. Com o coeficiente de difusão obtido pôde-se notar vii que a partir de 30 % de enxertia o copolímero torna-se menos hidrofílico, devido ao aumento das ligações cruzadas entre as cadeias de PHEMA. O teste de citotoxicidade revelou que PEBD-g-PHEMA pode ser utilizado como biomaterial. O copolímero imobilizado, crotoxina encapsulada e a crotoxina livre foram avaliados “in vivo” em camundongos da linhagem C3H. Durante 20 dias foram observados alterações de peso e comportamento, além das funções motoras. Os resultados demonstraram que o grupo injetado com crotoxina teve uma perda de peso maior do que os demais grupos. Concluindo, a crotoxina imobilizada nos copolímeros poderia ser utilizada pela sua ação catalítica foslipásica, na hidrólise dos fosfolipídeos presente nas lipoproteínas de baixa densidade (LDL) do soro humano. Por outro lado, a crotoxina encapsulada nas micro-esferas de poli(épsilon-caprolactona) (PCL) poderia ser utilizada como sistema de liberação dirigida (local) da crotoxina, destinada a terapia tumoral.
The aim of the work was the obtainment of polymeric matrices immobilized with crotoxin purified from crude venom of rattle snake. A matrix was processed by gamma irradiation by the grafting of a hydrogel onto a polymeric film which resulted in a copolymer for the chemical immobilization of crotoxin. The second matrix was attainned by the entrapment of crotoxin in microspheres of epsilon-polycaprolactone. After the purification, the crotoxin proceeding from the snake Crotalus durissus terrificus was evaluated biochemical and biologically. The letal dose (LD50%) of the toxin was 0.09/kg animal. The test of cytotoxicity not revealed any significant difference between the tumoral cells and the respective normal control cells in culture. Grafting copolymers were used as scaffold for the chemical immobilization of the purified crotoxin. For this purpose the low density polyethylene (LDPE) and the hydrophilic monomer 2-hydroxy-ethyl-methacrylate (HEMA) were copolymerized in a 60Co source. The copolymers (LDPE-g-PHEMA) showed grafting levels in the range of 2 and 50 %. In the infrared spectroscopy analysis (FTIR-ATR) it was observed in the copolymer, carbonyl groups (C=O) and hydroxyl groups –OH due to the grafting of PHEMA. The MEV micrographies showed a smooth surface for the virgin LDPE and a rough surface for the LDPE-g-PHEMA, owing to the presence of grafted PHEMA. The hydrophilicity was observed by the determination of water content in the copolymer after immersion in water. By the diffusion coefficient it was noted that from 30 % grafting degree, the copolymers become less hydrophilic due to the crosslinking increase among the chains in PHEMA. The biocompatibility of the LDPE-g-PHEMA was proved by the cytoxicity test. At the end, the immobilized copolymer, the entraped crotoxin and the free crotoxin was tested “in vivo”. During 20 days, C3H strain mouses were observed in ix their weight, behavior and motor changes. The results demonstrated that the group injected with crotoxin had visible loss of weight higher than the other groups. It was concluded that, potentially the immobilized crotoxin could be used by its catalitic phospholipase action, possibily for the hydrolysis of phopholipids present in human serum low density lipoproteins (LDL). By the other side, the entraped crotoxin in the microspheres of epsilon-polycaprolactone could be employed in the managed drug delivered system for the tumoral therapy.
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Книги з теми "PHEME"

1

Bangladesh) International Children's Film Festival Bangladesh (9th 2016 Dhaka. Future in frames: Phreme phreme āgāmī svapna. Edited by Aminul Islam, S. M., editor and Children's Film Society Bangladesh. [Dhaka]: Children's Film Society Bangladesh, 2016.

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Jāyasavāla, Candrakiśora. Sāta phere. Nayī Dillī: Bhāratīya Jñānapīṭha, 2009.

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Bhāṭīā, Guracarana Siṅgha. Satta phere. Dillī: Naishanala Buka Shāpa, 1989.

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Jāyasavāla, Candrakiśora. Sāta phere. Nayī Dillī: Bhāratīya Jñānapīṭha, 2009.

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Kulakarṇī, Go Vi. Pheṭe Kolhāpurī. Kolhāpura: Abhinandana Prakāśana, 2014.

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Bhatia, Gurcharan Singh. Satt phere. Hayes: Star Books International, 1990.

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Sāta phere. Nayī Dillī: Bhāratīya Jñānapīṭha, 2009.

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Caṭṭopādhyāẏa, Aruṇakumāra. Pākhirā phere nā. Kalikātā: Priẏaśilpa Prakāśana, 2000.

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Phele āsā dinaguli. Ḍhākā: Hālimā Hāẏadāra, 1992.

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Sāhu, Rasānanda. Samaẏa pachaku phere. Bhubaneśvara: Jñānayuga Pablikeśanas, 1997.

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Частини книг з теми "PHEME"

1

Sinha, Saurabh. "PhyME." In Comparative Genomics, 309–17. Totowa, NJ: Humana Press, 2007. http://dx.doi.org/10.1007/978-1-59745-514-5_19.

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Cramer, Phebe. "Cramer, Phebe." In Encyclopedia of Personality and Individual Differences, 928. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-24612-3_413.

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Cramer, Phebe. "Cramer, Phebe." In Encyclopedia of Personality and Individual Differences, 1–2. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-28099-8_413-1.

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Moore, Joe, and Peter Lax. "Aviation Considerations in PHEM." In Textbook of Acute Trauma Care, 389–408. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-83628-3_19.

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Seidl, Klaus. "Approaching Virtual Organism by PheGe." In Advances in Artificial Life, 696–705. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-39432-7_75.

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Ferrara, V. La, E. Massera, M. L. Miglietta, T. Polichetti, G. Rametta, and G. Di Francia. "Investigation of the Swelling Properties of PHEMA and PHEMA/CB for Sensing Application." In Lecture Notes in Electrical Engineering, 47–50. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3606-3_5.

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7

Arica, M. Yakup, and Vasif Hasirci. "Novel Phema Membranes for Potential Bioelectrode use." In Uses of Immobilized Biological Compounds, 81–90. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1932-0_8.

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8

Honeywill, Ross. "The Moral Phene: Not the Selfish Gene." In The Man Problem, 175–86. New York: Palgrave Macmillan US, 2016. http://dx.doi.org/10.1057/9781137551696_20.

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9

Denizli, A., A. Tuncel, M. Olcay, V. Sarnatskaya, V. Sergeev, V. G. Nikolaev, and E. Piskin. "Biologically Modified PHEMA Beads for Hemoperfusion: Preliminary Studies." In Biologically Modified Polymeric Biomaterial Surfaces, 129–37. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1872-9_17.

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Park, Bo Hyung, Young A. Han, Jin Hyun Choi, and Jeong Ok Lim. "Biocompatibility of Phema and P(Hema-Co-Sma) Hydrogels." In Key Engineering Materials, 51–55. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-958-x.51.

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Тези доповідей конференцій з теми "PHEME"

1

Jansen, Slinger, and Sjaak Brinkkemper. "Pheme: A Communication Infrastructure for Product Software Knowledge." In 2007 IEEE International Conference on Software Maintenance. IEEE, 2007. http://dx.doi.org/10.1109/icsm.2007.4362683.

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Çıkım, Taha, Efe Armağan, Gözde Özaydın İnce, and Ali Koşar. "Flow Boiling Enhancement in Microtubes With Crosslinked pHEMA Coatings." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64388.

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In this experimental study, flow boiling in mini/microtubes was investigated with surface enhancements provided by crosslinked polyhydroxyethylmethacrylate (pHEMA coatings), which is used as a crosslinker coating with different thicknesses (50 nm, 100 nm and 150 nm) on inner microtube walls. Flow boiling heat transfer experiments were conducted on microtubes (with inner diameters of 249 μm and 507 μm) with enhanced inner surfaces with crosslinked pHEMA coatings. pHEMA nanofilms were coated with initiated chemical vapor deposition (iCVD) technique. De-ionized water was utilized as the working fluid in this study. Experimental results obtained from coated microtubes were compared to their plain surface counterparts at two different mass fluxes, (5,000 kg/m2s and 30,000 kg/m2s) and significant enhancements in Critical Heat Flux and boiling heat transfer were attained. These promising results support the use of crosslinked pHEMA coated microtubes/channels as a surface enhancement technique for micro scale cooling applications.
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3

Khalili Sadaghiani, Abdolali, Yağmur Şişman, Gözde Özaydın İnce, and Ali Koşar. "An Experimental Study on Flow Boiling Characteristics of pHEMA Nano-Coated Surfaces in a Microchannel." In ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6573.

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In this study, the effect of pHEMA (Polyhydroxyethylmethacrylate) nanostructure coated surfaces on flow boiling was investigated in a rectangular microchannel. Experiments were conducted using deionized water as the working fluid to investigate flow boiling in a microchannel with dimensions of 14 cm length, 1.5 cm width, and 500 μm depth. The effect of pHEMA coatings (coated on 1.5 × 1.5 cm2 silicon plates) on heat transfer coefficients and flow patterns was assessed and supported using a high speed camera system. Although the contact angle decreases on nano-coated surfaces, due to surface porosity, boiling heat transfer coefficient increases. Furthermore, visualization results indicated that uncoated surfaces experienced a smaller nucleate boiling region. It was also observed that dryout occurs at higher heat fluxes for coated surfaces.
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Holmes, Tiffany. "Phene-." In ACM SIGGRAPH 99 Conference abstracts and applications. New York, New York, USA: ACM Press, 1999. http://dx.doi.org/10.1145/311625.312098.

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Carisetti, Dominique, Mohsine Bouya, Odile Bezencenet, Bernard Servet, Jean-Claude Clément, Benoit Lambert, Laurent Caille, Nathalie Malbert, and Nathalie Labat. "Infrared Thermography Developments for III-V Transistors and MMICs." In ISTFA 2011. ASM International, 2011. http://dx.doi.org/10.31399/asm.cp.istfa2011p0230.

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Abstract This paper focuses on infrared (IR) thermography capabilities on III-V components for thermal measurements applications and failure analysis (FA). The first part discusses the thermal mapping on InGaAs/AlGaAs PHEMT structure and compares IR thermal measurement with the well-known techniques as Raman and SThM. The second part discusses IR thermography on challenging FA for hot spot detection on the most popular type of capacitor for III-V MMICs as the metal-insulator-metal capacitor. It shows how IR thermography can easily localize very small pinholes in SiN, where liquid crystal and OBIRCH techniques are not well adapted.
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6

Yagyu, Eiji, Tetsuya Nishltnura, and Motomu Yoshimura. "Quantitative and Theoretical Analysis of PHB-Hole Feature under Applying Electric Field." In Spectral Hole-Burning and Luminescence Line Narrowing: Science and Applications. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.pd2.

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We have investigated the stark effect on the spectral hole characteristics in the photochemical hole burning systems of anthraquinone derivatives, such as, 1,4-dihydroxyanthraquinone (HAQ) and 4-amino-2,6-bis(4-butylphenoxy)1,5-dihydroxyanthraquinone (ABDAQ) as guest molecules embedded in host polymers such as 2-hydroxyethyl methacrylate (PHEMA) or poly(vinyl butyral) (PVB)1-3). Consequently, we evaluated the dipole moment differences |δμ| of guest molecules. These dipole moment differences depended on the characteristics of the guest and host molecules. This material dependence of the dipole moment differences was able to be explained qualitatively by Hammett’s substituent constant and the Taft’s polar substituent constant3).
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7

Zhang Qian, Li Wenyuan, Wang Zhigong, Qian Cheng, and Zhang Xichang. "2.4GHz WLAN D-pHEMT LNA." In 2009 International Conference on Advanced Technologies for Communications (ATC 2009). IEEE, 2009. http://dx.doi.org/10.1109/atc.2009.5349601.

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8

Sun, Q., V. T. Vo, R. A. Davies, J. Tan, and A. A. Rezazadeh. "Miniaturized Multilayer CPW pHEMT Amplifiers." In 2008 European Microwave Integrated Circuit Conference (EuMIC). IEEE, 2008. http://dx.doi.org/10.1109/emicc.2008.4772224.

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Ayzenshtat, G. I., V. G. Bozhkov, and A. Y. Yushchenko. "Electron drift velocity in PHEMT." In 2010 20th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo 2010). IEEE, 2010. http://dx.doi.org/10.1109/crmico.2010.5632957.

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Fujii, Kohei. "Low cost Ka-band 7W GaAs PHEMT based HPA with GaN PHEMT equivalent performance." In 2015 IEEE Radio Frequency Integrated Circuits Symposium (RFIC). IEEE, 2015. http://dx.doi.org/10.1109/rfic.2015.7337741.

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Звіти організацій з теми "PHEME"

1

Mays, Kenneth. A 40 GHz Power Amplifier Using a Low Cost High Volume 0.15 um Optical Lithography pHEMT Process. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.552.

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