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Articles de revues sur le sujet « Noise-Power ratio (NPR) »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 2 février 2022

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1

Kumar, Rajendra. "Theoretical Analysis of the Noise Power Ratio of Nonlinear Power Amplifiers." Journal of Applied Mathematics 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/8710860.

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This paper presents a theoretical analysis and derives the amplifier output noise power spectral density result in a closed form when the input to the amplifier is a band limited Gaussian noise. From the computed power spectral density the NPR is evaluated by a simple subtraction. The method can be applied to any amplifier with known input-output characteristics. The method may be applied to analyze various other important characteristics of the nonlinear amplifier such as spectral regrowth that refers to the spreading of the signal bandwidth when a band limited signal is inputted to the nonli

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Duffy, Maxwell Robert, Gregor Lasser, and Zoya Popović. "Distortion mitigation for 100 and 250 MHz discrete supply modulation of a three-stage K-band MMIC PA." International Journal of Microwave and Wireless Technologies 12, no. 8 (2020): 707–15. http://dx.doi.org/10.1017/s1759078720000847.

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AbstractThis paper presents a high-efficiency linear GaN K-band transmitter for broadband high peak-average power ratio (PAPR) signals. A GaN MMIC 18.5–24 GHz three-stage power amplifier with over 4 W peak output power, 20 dB saturated gain, and 40% peak PAE is supply-modulated with a four-level discrete dynamic supply GaN MMIC. For 100 MHz signals with ${\rm PAPR}\gt 10\, {\rm dB}$, we demonstrate an average efficiency improvement from 14 to 20% with a simultaneous linearity improvement in noise power ratio (NPR) from 23 to 26 dB through a shaping function focused on gain linearization. For 2

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Gharaibeh, Khaled M. "On the relationship between the noise-to-power ratio (NPR) and the effective in-band distortion of WCDMA signals." AEU - International Journal of Electronics and Communications 64, no. 3 (2010): 273–79. http://dx.doi.org/10.1016/j.aeue.2008.11.015.

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Haris, Hazlihan, Ahmad Razif Muhammad, Norazlina Saidin, et al. "Dual-Wavelength Thulium Ytterbium Co-Doped Fiber Laser." Indonesian Journal of Electrical Engineering and Computer Science 8, no. 2 (2017): 457. http://dx.doi.org/10.11591/ijeecs.v8.i2.pp457-461.

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<p>We report on the generation of dual-wavelength fiber laser peaking at 1990.64 and 1998.92 nm with a simple ring cavity setup. The lasers are demonstrated using a fabricated silica-based nano-engineered octagonal shaped double-clad Thulium-Ytterbium co-doped fiber (TYDF) as a gain medium in a simple all-fiber ring configuration. By using 980 nm multimode laser, a stable dual-wavelength laser is generated at a threshold pump power of 1500 mW due to the non-polarization rotation (NPR) effect occurred in the cavity. The effect has been self-controlled by a suppression of mode competition

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Latiff, A. A., H. Shamsudin, Z. C. Tiu, H. Ahmad, and S. W. Harun. "Switchable soliton mode-locked and multi-wavelength operation in thulium-doped all-fiber ring laser." Journal of Nonlinear Optical Physics & Materials 25, no. 03 (2016): 1650034. http://dx.doi.org/10.1142/s021886351650034x.

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A switchable soliton mode-locked and multi-wavelength operation in thulium-doped fiber laser (TDFL) is demonstrated based on nonlinear polarization rotation (NPR) technique. The TDFL produces a soliton pulse operating at 1917.66[Formula: see text]nm using a 5[Formula: see text]m long thulium-doped fiber (TDF) as a gain medium as well as nonlinear medium. The solitonic behavior is further identified with two orders of Kelly sidebands in the output spectrum. The mode-locked emission is obtained from threshold pump power of 522–1052[Formula: see text]mW with consistent pulse repetition rate of 14

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Chen, C.-N., V. J. Sank, S. M. Cohen, and D. I. Hoult. "The field dependence of NMR imaging. I. Laboratory assessment of signal-to-noise ratio and power deposition." Magnetic Resonance in Medicine 3, no. 5 (1986): 722–29. http://dx.doi.org/10.1002/mrm.1910030508.

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Ghasemi, Mir Majid, Javad Frounchi, and Fahimeh Dehkhoda. "A New Receiver Front-End for Simultaneous Dual-Frequency NMR Applications." Journal of Circuits, Systems and Computers 25, no. 09 (2016): 1650109. http://dx.doi.org/10.1142/s0218126616501097.

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To obtain certain information such as metabolic concentrations in neural or muscular tissues and other applications, it is necessary to design nuclear magnetic resonance (NMR) transmitters/receivers capable of operating at multiple frequencies, while maintaining a good performance at each frequencies. We have proposed a new NMR receiver front-end for simultaneous detection of proton and carbon nucleus. The system consists of two reception coils for carbon and hydrogen analysis, a multiband low-noise amplifier (LNA) for increasing the voltage level and a network for passive amplification, noise

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Huang, Xiaolei, Hui Dong, Quan Tao, et al. "Sensor Configuration and Algorithms for Power-Line Interference Suppression in Low Field Nuclear Magnetic Resonance." Sensors 19, no. 16 (2019): 3566. http://dx.doi.org/10.3390/s19163566.

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Low field (LF) nuclear magnetic resonance (NMR) shows potential advantages to study pure heteronuclear J-coupling and observe the fine structure of matter. Power-line harmonics interferences and fixed-frequency noise peaks might introduce discrete noise peaks into the LF-NMR spectrum in an open environment or in a conductively shielded room, which might disturb J-coupling spectra of matter recorded at LF. In this paper, we describe a multi-channel sensor configuration of superconducting quantum interference devices, and measure the multiple peaks of the 2,2,2-trifluoroethanol J-coupling spectr

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QIAO, FEI, HUAZHONG YANG, DINGLI WEI, and HUI WANG. "MODIFIED CONDITIONAL-PRECHARGE SENSE-AMPLIFIER-BASED FLIP-FLOP WITH IMPROVED SPEED." Journal of Circuits, Systems and Computers 16, no. 02 (2007): 199–210. http://dx.doi.org/10.1142/s0218126607003654.

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A modified version of conditional-precharge sense-amplifier-based flip-flop (mCP-SAFF) is proposed. By using the differential clocked CMOS (C2MOS) latch with one shared output holder and the conditional-precharge modules to simplify the sense-amplifier latch, the mCP-SAFF can achieve a much shorter input to output delay (D-to-Q delay) and more symmetrical rising/falling delays than those of the original conditional-precharge sense-amplifier-based flip-flops (CP-SAFF). Post-layout simulation results show that the mCP-SAFF, compared with the widely used conventional DFF, does not suffer neither

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Williamson, James M., Robert J. Bowling, and Richard L. McCreery. "Near-Infrared Raman Spectroscopy with a 783-nm Diode Laser and CCD Array Detector." Applied Spectroscopy 43, no. 3 (1989): 372–75. http://dx.doi.org/10.1366/0003702894203048.

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A GaAlAs diode laser operating at 783 nm was combined with an unintensified charge coupled device (CCD) array detector and single grating spectrograph to obtain near-infrared (NIR) Raman spectra. The spectrometer has no moving parts and retains the high sensitivity expected for multichannel, shot-noise-limited detectors. Diode laser excitation permits high-sensitivity Raman spectroscopy with reduced fluorescence interference, in comparison to that produced with conventional visible lasers. The diode laser/CCD approach should exhibit much higher sensitivity than FT-Raman systems operating at 10

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Schulte, Justin A. "Cumulative areawise testing in wavelet analysis and its application to geophysical time series." Nonlinear Processes in Geophysics 23, no. 1 (2016): 45–57. http://dx.doi.org/10.5194/npg-23-45-2016.

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Abstract. Statistical significance testing in wavelet analysis was improved through the development of a cumulative areawise test. The test was developed to eliminate the selection of two significance levels that an existing geometric test requires for implementation. The selection of two significance levels was found to make the test sensitive to the chosen pointwise significance level, which may preclude further scientific investigation. A set of experiments determined that the cumulative areawise test has greater statistical power than the geometric test in most cases, especially when the s

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Crisci, Teresa, Luigi Moretti, and Maurizio Casalino. "Theoretical Investigation of Responsivity/NEP Trade-off in NIR Graphene/Semiconductor Schottky Photodetectors Operating at Room Temperature." Applied Sciences 11, no. 8 (2021): 3398. http://dx.doi.org/10.3390/app11083398.

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In this work we theoretically investigate the responsivity/noise equivalent power (NEP) trade-off in graphene/semiconductor Schottky photodetectors (PDs) operating in the near-infrared regime and working at room temperature. Our analysis shows that the responsivity/NEP ratio is strongly dependent on the Schottky barrier height (SBH) of the junction, and we derive a closed analytical formula for maximizing it. In addition, we theoretically discuss how the SBH is related to the reverse voltage applied to the junction in order to show how these devices could be optimized in practice for different

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Grombacher, Denys. "Numerically optimized modulations for adiabatic pulses in surface nuclear magnetic resonance." GEOPHYSICS 83, no. 2 (2018): JM1—JM14. http://dx.doi.org/10.1190/geo2016-0574.1.

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Adiabatic pulses, which provide an effective means of generating a large-amplitude nuclear magnetic resonance (NMR) signal in the presence of a heterogeneous magnetic field, have the potential to greatly improve the signal-to-noise ratio of the surface NMR experiment. To ensure efficient implementation of adiabatic pulses into the surface NMR framework, a numerically optimized modulation (NOM) approach is used to design adiabatic pulses specifically intended for application in surface NMR. The scenario in which the frequency response of the tuned transmit coil is used to modulate the current a

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Reddy, M. Madhusudhan, M. Sailaja, and K. Babulu. "Energy optimization of 6T SRAM cell using low-voltage and high-performance inverter structures." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 3 (2019): 1606. http://dx.doi.org/10.11591/ijece.v9i3.pp1606-1619.

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The performance of the cell deteriorates, when static random access memory (SRAM) cell is operated below 1V supply voltage with continuous scale down of the complementary metal oxide semiconductor (CMOS) technology. The conventional 6T, 8T-SRAM cells suffer writeability and read static noise margins (SNM) at low-voltages leads to degradation of cell stability. To improve the cell stability and reduce the dynamic power dissipation at low- voltages of the SRAM cell, we proposed four SRAM cells based on inverter structures with less energy consumption using voltage divider bias current sink/sourc

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Huang, Jian, Quan Wen, Qiuyu Nie, Fei Chang, Ying Zhou, and Zhiyu Wen. "Miniaturized NIR Spectrometer Based on Novel MOEMS Scanning Tilted Grating." Micromachines 9, no. 10 (2018): 478. http://dx.doi.org/10.3390/mi9100478.

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This paper presents a dispersive near-infrared spectrometer with features of miniaturization, portability and low cost. The application of a resonantly-driven scanning grating mirror (SGM) as a dispersive element in a crossed Czerny–Turner configuration enables the design of a miniaturized spectrometer that can detect the full spectra using only one single InGaAs diode. In addition, a high accuracy recalculation is realized, which can convert time-dependent measurements to spectrum information by utilizing the deflection position detector integrated on SGM and its associated closed-loop contro

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Azaïs, Thierry, Geoffrey Hartmeyer, Sandrine Quignard, et al. "Solid-state NMR characterization of drug-model molecules encapsulated in MCM-41 silica." Pure and Applied Chemistry 81, no. 8 (2009): 1345–55. http://dx.doi.org/10.1351/pac-con-08-11-10.

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In this contribution, we present a solid-state NMR approach to characterize drug-model molecules as ibuprofen, benzoic acid and lauric acid, encapsulated in MCM-41 silica and submitted to strong confinement effects. In particular, we show that by a careful choice of the solid-state NMR sequences, it is possible to efficiently characterize these highly mobile molecules and their interactions with the pore surface. Thus, we demonstrate that 13C NMR spectroscopy is a powerful tool to characterize and even quantify entrapped and non-entrapped species by using either single-pulse excitation (SPE) o

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Hirabayashi, Hisashi, Kenji Akabane, Masaki Morimoto, Yosiaki Sofue, Makato Inoue, and Toshihiro Handa. "The Sgr B2 Region Seen at 43 GHZ." Symposium - International Astronomical Union 115 (1987): 158–60. http://dx.doi.org/10.1017/s0074180900095255.

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The Sgr B2 region was mapped at 43 GHz (λ = 6.9 mm) with the 45m radio telescope of Nobeyama Radio Observatory. The observing parameters were: a) half power beamwidth 38″, b) pointing accuracy better than 10″, c) central frequency 43.0 GHz, d) bandwidth 500 MHz, and e) system noise temperature 400 K; and the observational aspects were: a) mapping with one polarization, b) liquid-nitrogen cooled load switching and c) reduction by NOD-2 programme. The obtained map is shown in Figure 1. Sgr B2 is resolved into several components which correspond to those by Martin and Downes (1972) and Downes et

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Nádas, József, and Vilmos Rakovics. "High Intensity Broad Spectrum LEDs in the Near Infrared Range." Materials Science Forum 885 (February 2017): 141–46. http://dx.doi.org/10.4028/www.scientific.net/msf.885.141.

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IR LEDs are widely used in the near-infrared (NIR) spectroscopy, especially in hand-held devices for the detection and measurement of organic materials, allowing faster and cheaper examinations. The -OH, -NH and -CH functional groups found in organic substances can frequently be detected by spectroscopy through absorbance measurement at the resonance wavelength of valence-bond vibrations. The measured wavelengths are 4-2.5 μm, while signal to noise ratio of photon detectors is low due to thermal noise at room temperature. The 1st-3rd harmonic absorption bands are located in the range of the NI

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Thonke, K., T. Baier, J. Hamann, O. Scheerer, and R. Sauer. "Time- and Energy-Resolved Emission Spectroscopy Using a Step-Scan FT Spectrometer Combined with Correlational Analysis Techniques." Applied Spectroscopy 51, no. 4 (1997): 548–51. http://dx.doi.org/10.1366/0003702971940567.

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The decay of photoluminescence emission signals on the time scale from microseconds to seconds can be measured with superior dynamics and signal-to-noise ratio by a new method which makes use of correlation analysis with pseudorandom binary sequences. Instead of excitation of the sample by one short laser pulse for each decay cycle (which results in low average emission intensity), the sample is pumped with a continuous-wave laser modulated by a pseudorandom sequence with δ-function-like autocorrelation properties. Therefore, on the time average half of the exciting laser power pumps the sampl

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Huang, Lei, Xiaoyu Zhao, Wei Chen, and H. Vincent Poor. "Low-Latency Short-Packet Transmission over a Large Spatial Scale." Entropy 23, no. 7 (2021): 916. http://dx.doi.org/10.3390/e23070916.

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Short-packet transmission has attracted considerable attention due to its potential to achieve ultralow latency in automated driving, telesurgery, the Industrial Internet of Things (IIoT), and other applications emerging in the coming era of the Six-Generation (6G) wireless networks. In 6G systems, a paradigm-shifting infrastructure is anticipated to provide seamless coverage by integrating low-Earth orbit (LEO) satellite networks, which enable long-distance wireless relaying. However, how to efficiently transmit short packets over a sizeable spatial scale remains open. In this paper, we are i

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Kenefick, Robert W., Samuel N. Cheuvront, Leonard D. Elliott, Brett R. Ely, and Michael N. Sawka. "Biological and analytical variation of the human sweating response: implications for study design and analysis." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 302, no. 2 (2012): R252—R258. http://dx.doi.org/10.1152/ajpregu.00456.2011.

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Appropriate quantification of analytical and biological variation of thermoregulatory sweating has important practical utility for research design and statistical analysis. We sought to examine contributors to variability in local forearm sweating rate (SR) and sweating onset (SO) and to evaluate the potential for using bilateral measurements. Two women and eight men (26 ± 9 yr; 79 ± 12 kg) completed 5 days of heat acclimation and walked (1.8 l/min V̇o2) on three occasions for 30 min in 40°C, 20% RH, while local SR and SO were measured. Local SR measures among days were not different (2.14 ± 0

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Buat, V., M. Boquien, K. Małek та ін. "Dust attenuation and Hα emission in a sample of galaxies observed with Herschel at 0.6 < z < 1.6". Astronomy & Astrophysics 619 (листопад 2018): A135. http://dx.doi.org/10.1051/0004-6361/201833841.

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Context. Dust attenuation shapes the spectral energy distribution of galaxies. It is particularly true for dusty galaxies in which stars experience a heavy attenuation. The combination of UV to IR photometry with the spectroscopic measurement of the Hα recombination line helps to quantify dust attenuation of the whole stellar population and its wavelength dependence. Aims. We want to derive the shape of the global attenuation curve and the amount of obscuration affecting young stars or nebular emission and the bulk of the stellar emission in a representative sample of galaxies selected in IR.

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Gerilowski, K., A. Tretner, T. Krings, et al. "MAMAP – a new spectrometer system for column-averaged methane and carbon dioxide observations from aircraft: instrument description and performance assessment." Atmospheric Measurement Techniques Discussions 3, no. 4 (2010): 3199–276. http://dx.doi.org/10.5194/amtd-3-3199-2010.

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Abstract. Carbon dioxide (CO2) and Methane (CH4) are the two most important anthropogenic greenhouse gases. CH4 is furthermore one of the most potent present and future contributors to global warming because of its large global warming potential (GWP). Our knowledge of CH4 sources and sinks is based primarily on sparse in-situ local point measurements from micro sites and surface networks and more recently on low spatial resolution satellite observations. There is a need for measurements of the dry columns of CO2 and CH4 having high spatial resolution and spatial coverage. In order to fill thi

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Echiburú, C. S., S. Guillot, Y. Zhao, C. O. Heinke, F. Özel, and N. A. Webb. "Spectral analysis of the quiescent low-mass X-ray binary in the globular cluster M30." Monthly Notices of the Royal Astronomical Society 495, no. 4 (2020): 4508–17. http://dx.doi.org/10.1093/mnras/staa1456.

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ABSTRACT We present a recent Chandra observation of the quiescent low-mass X-ray binary containing a neutron star (NS), located in the globular cluster M30. We fit the thermal emission from the NS to extract its mass and radius. We find no evidence of flux variability between the two observations taken in 2001 and 2017, nor between individual 2017 observations, so we analyse them together to increase the signal-to-noise ratio. We perform simultaneous spectral fits using standard light-element composition atmosphere models (hydrogen or helium), including absorption by the interstellar medium, c

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Gerilowski, K., A. Tretner, T. Krings, et al. "MAMAP – a new spectrometer system for column-averaged methane and carbon dioxide observations from aircraft: instrument description and performance analysis." Atmospheric Measurement Techniques 4, no. 2 (2011): 215–43. http://dx.doi.org/10.5194/amt-4-215-2011.

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Abstract. Carbon dioxide (CO2) and Methane (CH4) are the two most important anthropogenic greenhouse gases. CH4 is furthermore one of the most potent present and future contributors to global warming because of its large global warming potential (GWP). Our knowledge of CH4 and CO2 source strengths is based primarily on bottom-up scaling of sparse in-situ local point measurements of emissions and up-scaling of emission factor estimates or top-down modeling incorporating data from surface networks and more recently also by incorporating data from low spatial resolution satellite observations for

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Hussain, Muhammad, Syed Hassan Abbas Jaffery, Asif Ali, et al. "NIR self-powered photodetection and gate tunable rectification behavior in 2D GeSe/MoSe2 heterojunction diode." Scientific Reports 11, no. 1 (2021). http://dx.doi.org/10.1038/s41598-021-83187-z.

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AbstractTwo-dimensional (2D) heterostructure with atomically sharp interface holds promise for future electronics and optoelectronics because of their multi-functionalities. Here we demonstrate gate-tunable rectifying behavior and self-powered photovoltaic characteristics of novel p-GeSe/n-MoSe2 van der waal heterojunction (vdW HJ). A substantial increase in rectification behavior was observed when the devices were subjected to gate bias. The highest rectification of ~ 1 × 104 was obtained at Vg = − 40 V. Remarkable rectification behavior of the p-n diode is solely attributed to the sharp inte

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Rimbaud, Robin. "Scan and Deliver." M/C Journal 8, no. 4 (2005). http://dx.doi.org/10.5204/mcj.2390.

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   As I sit here, the radio announcer announces a feature on the forthcoming Big Brother series, another chance to engage in this collective shared experience, another opportunity to revel in your very own voyeuristic impulse, what once was private is now made public.   Curiously it’s almost fifteen years ago since I released the first Scanner recordings Scanner 1 [1992] and Scanner 2 [1993] featuring the intercepted cellular phone conversations of unsuspecting talkers, which I edited into minimalist musical settings as if they were instruments, bringing into focu

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Barker, Timothy Scott. "Information and Atmospheres: Exploring the Relationship between the Natural Environment and Information Aesthetics." M/C Journal 15, no. 3 (2012). http://dx.doi.org/10.5204/mcj.482.

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Our culture abhors the world.Yet Quicksand is swallowing the duellists; the river is threatening the fighter: earth, waters and climate, the mute world, the voiceless things once placed as a decor surrounding the usual spectacles, all those things that never interested anyone, from now on thrust themselves brutally and without warning into our schemes and manoeuvres (Michel Serres, The Natural Contract, p 3). When Michel Serres describes culture's abhorrence of the world in the opening pages of The Natural Contract he draws our attention to the sidelining of nature in histories and theories th

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Ware, Ianto. "Andrew Keen Vs the Emos: Youth, Publishing, and Transliteracy." M/C Journal 11, no. 4 (2008). http://dx.doi.org/10.5204/mcj.41.

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This article is a comparison of two remarkably different takes on a single subject, namely the shifting meaning of the word ‘publishing’ brought about by the changes in literacy habits related to Web 2.0. One the one hand, we have Andrew Keen’s much lambasted 2007 book The Cult of the Amateur, which is essentially an attempt to defend traditional gatekeeper models of cultural production by denigrating online, user-generated content. The second is Spin journalist Andy Greenwald’s Nothing Feels Good, focusing on the Emo subculture of the early 2000s and its reliance on Web 2.0 as an integral med

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Edmundson, Anna. "Curating in the Postdigital Age." M/C Journal 18, no. 4 (2015). http://dx.doi.org/10.5204/mcj.1016.

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It seems nowadays that any aspect of collecting and displaying tangible or intangible material culture is labeled as curating: shopkeepers curate their wares; DJs curate their musical selections; magazine editors curate media stories; and hipsters curate their coffee tables. Given the increasing ubiquity and complexity of 21st-century notions of curatorship, the current issue of MC Journal, ‘curate’, provides an excellent opportunity to consider some of the changes that have occurred in professional practice since the emergence of the ‘digital turn’. There is no doubt that the internet and int

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