3,218 research outputs found
Colección: Perfil #3
No full textThis board-book version of LM turns out to be quite creative. Ratoncete comes from school every afternoon and goes through the forest looking for adventures. He apparently blasts a horn into the ear of the sleeping lion. Don Leon wants to spank him as a result, but Ratoncete offers an apology, not an offer of help. Later, he happens upon the lion in his trap of ropes. 8 pages, counting both covers. 6½" x 9".Language note: SpanishNo Autho
Markets Equilibrium: The Is-Lm Model
No full text. The purpose of this study is to analyze how the concept of markets equilibrium: the IS-LM Model. This research uses library research method by using reference sources from books and journals according to the theme. The author uses a qualitative method which is explained graphically, namely the market balance of the IS-LM model where the focus is on money and goods markets associated with macroeconomics where researchers take the side of investors. The results of this study are that the balance in the economy is the point where the IS and LM curves intersect. This point provides an interest rate (r) and income level (Y) that satisfies the equilibrium conditions that occur in the goods market and money market. In other words, planned spending equals actual spending, and the demand for real money balances equals the supply. So that the IS-LM balance, it is stated that IS=LM
<Articles>A Dynamical IS-LM Model
No full text[抄録]IS-LM モデルは、ヒックスによるケインズ経済学の因果関係を重視しながら要約したモデルと解釈することができる。IS-LM モデルの安定性分析はすでに研究成果があるが、1S-LM モデルの動学化はほとんど研究成果がない。本稿は IS-LM モデルの動学化を試みる。まず投資関数に資本ストックを取り入れ、資本蓄積と経済の変動を考える。次にカルドアモデルを考慮し、投資の予想収益率表の変化を仮定し、経済に循環が発生することを考察する。
[Abstract]In this paper, The author tries to build a Dynamical IS-LM Model. The lnvestment depends on two factors, one is the rate of interest, and the other is the rate of prosperity yield of the investment. I will focus on the second factor. As was shown by Kaldor, the rate of prosperity yield has nonlinear fluctuations. By means of this character, This study proposes an IS-LM model that generates a cycle.departmental bulletin pape
Experimental and Numerical Investigation of an Evaporating Meniscus in a Capillary Slot : Microscale and Pore Scale Studies
No full textAn evaporating meniscus formed by a wetting °uid in a heated capillary slot with capillary driven °flow is numerically and experimentally investigated at the microscale and pore scale.
In the microscale analysis, the contact line region of an extended evaporating thin ¯lm meniscus is numerically investigated to study the influence of °uid properties on the heat transfer. The governing equations to describe the fluid °flow, heat and mass transfer phenomena in an evaporating extended meniscus are grouped uniquely as function of °uid dependent parameters, namely the interline heat flow number and heat pipe ¯figure of merit. A physical interpretation of these parameters is presented. Numerical experiments conducted with different working °fluids show that a °uid with a high interline heat °flow parameter and heat pipe ¯figure of merit also has a high cumulative heat transfer in the micro region encompassing the evaporating thin ¯lm.
In the pore scale analysis, the evaporation from a pentane meniscus in a heated capillary slot is experimentally and numerically investigated to study how the wetting characteristics are influenced with heat input. In the experimental investigation, a test set up is fabricated with a heated glass capillary slot that is partially immersed in a constant temperature bath with constant °uid level. A novel aspect of this experiment is that both the wicking height and steady state evaporation mass flow rate are measured simultaneously. Based on a macroscopic force balance, the apparent contact angle of the evaporating meniscus is experimentally estimated from the wicking height and mass flow rate. This is compared with the results obtained using evaporating thin ¯lm theory. The experimentally estimated contact angle is higher than that obtained from the thin ¯lm model but both experiment and theory show similar trends.
In the numerical study, a ¯finite volume numerical model of an evaporating meniscus in a heated capillary slot (simulating the above experimental condition) is developed for predicting the wicking height and mass flow rate. This model includes: (i) one-dimensional heat transfer and °uid °flow in the liquid and vapour regions of the capillary slot, (ii) one{dimensional evaporating thin ¯lm model for the meniscus region, and (iii) two-dimensional conduction heat transfer in the capillary wall. Correlations obtained from the evaporating thin{¯lm theory in terms of cumulative heat transfer and apparent contact angle are applied to the pore level problem. The problem is solved iteratively between the micro and pore scales till convergence is achieved. The wicking height is influenced by the change in apparent contact angle and the pressure drops to flow of liquid and vapor in the capillary slot that is a function of evaporation mass °ow rate. Heat input to the capillary slot increases both the contact angle in the evaporating meniscus and the frictional pressure drops in the liquid and vapor regions. In the present study, the influence of increased contact angle is more significant and the liquid and vapor pressure drops are negligible. The trends in the wicking height, mass flow rate and conductance are similar to the experimental data.
The proposed numerical approach using correlations from thin ¯lm theory to link the micro and macro scales yields results that are consistent with experimental data. The results show that the change in contact angle can degrade the ability of the liquid to wet the pore and hence result in a lower heat transfer coefficident
Plasma enhanced chemical vapor deposition of nanocrystalline graphene and device fabrication development
No full textLarge area growth of high quality graphene remains a challenge, and is currently dominated by chemical vapor deposition (CVD) on metal catalyst films. This method requires a transfer of the graphene onto an insulating substrate for electronic applications, and the graphene film quality and performance can vary with the transfer. A more attractive approach is plasma enhanced chemical vapor deposition (PECVD) of graphene and nanocrystalline graphene (NCG) directly on insulating substrates. The aim of this project was to explore the deposition process and microfabrication processes based on these NCG films.A deposition process for nanocrystalline graphene was developed in this work based on parallel-plate PECVD. NCG with thicknesses between 3 and 35nm were deposited directly on wet thermal oxidized silicon wafers with diameter of 150 mm, quartz glass and sapphire glass. High NCG thickness uniformities of 87% over full wafer were achieved. Surface roughness was measured by atomic force microscopy and shows root mean square (RMS) values of less than 0.23nm for 3nm thin films. NCG films deposited on quartz and sapphire show promising performance as transparent conductor with 13kΩ/X sheet resistance at 85% transparency. Furthermore, the suitability of the developed PECVD NCG films for microfabrication was demonstrated. Microfabrication process development was focused on four device types. NCG membranes were fabricated based on through-wafer inductively coupled plasma etching from the back, and consecutive membrane release by HF vapor etching.The fabrication of suspended NCG strips, based on HF vapor release, shows promising results, but was not entirely successful due to insufficient thickness of the sacrificial oxide. Top gated NCG strips are successfully fabricated, and the increased modulation by the top gate is demonstrated. Finally, NCG nanowire fabrication is performed on 150mm wafers. Experiments yielded an increased back gate modulation effect by a reduced NCG thickness, although no nanowire formation was observed. A highly accurate focused ion beam (FIB) prototyping technique was developed and applied to exfoliated graphene in this work. This technique systematically avoids any exposure of the graphene to Ga+-ions through the use of an alignment marker system, achieving alignment accuracies better than 250 nm. Contacts were deposited by FIB- or e-beam-assisted tungsten deposition, and FIB trench milling was used to confine conduction to a narrow channel. A channel passivation method based on e-beam-assisted insulator deposition has been demonstrated, and showed a reduction of ion damage to the graphene. Three fabricated transistor structures were electrically characterized
Miniaturized Slot Antenna with Frequency Tunability
No full text本論文首先提出一種以電容性負載進行縮小化的槽孔天線。這個方法是利用電容取代傳統的開路或短路的邊界條件，以縮短槽孔天線在相同共振頻率下所需的長度。由於吾人以微帶線偏移饋入槽孔天線，不僅能達到較佳的阻抗匹配，更無需額外的匹配電路。本論文亦提供一增加該微型化槽孔天線頻寬之方法，對於槽孔長度約為1/17真空波長的微型化槽孔天線，可達到3.2%的頻寬，淨空區之長寬分別為1/16真空波長及 1/19真空波長。最後，吾人利用變容二極體取代一般電容，以達到調整微型化槽孔天線之共振頻率之目的。經模擬與實驗證實，該天線共振頻率之可調範圍涵蓋1.18-2.42 GHz之頻寬。A novel miniaturized slot antenna terminated by a lumped capacitor is presented in this thesis. A lumped capacitor is placed at the truncated open end of a quarter-wavelength slot antenna to lower the resonant frequency; in other words, to reduce the slot length for the same resonance. The proposed slot antenna is offset fed by a microstrip line with an open stub, which is used mainly to tune out the input reactance of the antenna. With the conventional feeding structure, there is no need for any extra matching circuit. In this thesis, design guidelines for bandwidth enhancement of the miniaturized slot antenna are also discussed. A prototype antenna of slot length λ0 /17 etched on a small rectangular metallic area of dimensions λ0 /16 λ0 /19 provides an impedance bandwidth of 3.2%. Lastly, a varactor diode is used instead of the chip capacitor to attain the frequency tenability for the miniaturized slot antenna. The resultant design exhibits a very wide frequency tuning range between 1.18-2.42 GHz.Contents試委員審定書……………………………………………………………i謝……………………………………………………………………..…iii文摘要…………………………………………………...………………vbstract….………………………………………………...……………...viiontents……………………………………………………………………ixist of Figures……………………………………………………………xiist of Tables……………………………………………………………...xvhapter 1. Introduction………………………..…………………1.1 Motivation and literature survey..................………………………1.2 Chapter outline…………………………………………………4hapter 2. Review of Microstrip-Line-Fed Slot Antenna…………..……………….…….……………6.1 Modes and characteristics of offset-fed slot………………………6.2 Microstrip-to-slotline cross-junction transition…………………7hapter 3. Miniaturized Slot Antenna Loaded with Lumped Reactance………………………….….14.1 Slot antenna topology……………………………………………14.2 Simplified transmission line model……………………………15.3 Inductively-loaded slot antenna design…………………….……16.4 Capacitively-loaded slot antenna design………………………...18.5 Ground plane resonance and parametric study………..…………19.6 Miniaturized slot antenna for GPS application…………………23hapter 4. Varactor-Loaded Miniaturized Slot Antenna with Frequency Tunability…....58.1 Frequency tunability……………………………………………58.2 Antenna structure and dc bias network………………...……….58.3 Simulation and measurement results………….………………59hapter 5. Conclusion and Future Work……...……….74.1 Conclusion………….……………………………………………74.2 Future work……………………………………………………74eferences……………………………………………………………76ppendix………………………………………………………………78amp;#8195;ist of Figureshapter 2 ig. 2.1 Geometry of a microstrip-line-offset-fed slot antenna………..………………...9ig. 2.2 Microstrip-to-slotline transition………….……………………………………10ig. 2.3 Equivalent circuit for the transition of Fig. 2.2……………………………..…11ig. 2.4 Reduced equivalent circuit of Fig. 2.3…………………...……………………12ig. 2.5 Transformed equivalent circuit of Fig. 2.4………………..………...…………13hapter 3ig. 3.1 A λg /2 long, lossless transmission line shorted at both ends……………....25ig. 3.2 Geometry of half-wavelength slot antenna……………………………………26ig. 3.3 Measured and simulated input return losses of the half-wavelength slot antenna (1.6GHz)…………………...…………………………………….……………28ig. 3.4 Geometry of 5λg /16 length of inductively-loaded slot antenna…………...…29ig. 3.5 Measured and simulated input return losses of the 5λg /16 length of…...……… inductively-loaded slot antenna.…………………………………………..…31ig. 3.6(a) Measured and simulated E-plane radiation pattern of the prototype slot…… antenna (1.6 GHz).……………………………………………….………32ig. 3.6(b) Measured and simulated H-plane radiation pattern of the prototype slot…….. antenna (1.6 GHz)…………………………………………………………33ig. 3.7(a) Measured and simulated E-plane radiation pattern of the 5λg /16 length of….. inductively-loaded slot antenna (1.6 GHz)…………………………………34ig. 3.7(b) Measured and simulated H-plane radiation pattern of the 5λg /16 length of…. inductively-loaded slot antenna (1.6 GHz).………………………………...35ig. 3.8 Geometry of capacitively-loaded slot antenna…………………...……………37ig. 3.9 Measured and simulated input return losses of the half-wavelength slot antenna (1.2 GHz)………………………………………………………………...……39ig. 3.10 Measured and simulated input return losses of the capacitively-loaded slot…... antenna…………………………………………………………………….…40ig. 3.11(a) Measured and simulated E-plane radiation pattern of the capactively-loaded slot antenna (0.9 GHz)………………………………………………….…41ig. 3.11(b) Measured and simulated H-plane radiation pattern of the capactively-loaded slot antenna (0.9 GHz)…………….………………………………………42ig. 3.12 Photograph of miniaturized prototype slot antenna………………………..44ig. 3.13 Measured and simulated input return losses of the capacitively-loaded miniaturized slot antenna…………………………………………………...46ig. 3.14(a) Measured and simulated E-plane radiation pattern of the capactively-loaded miniaturized slot antenna ……………………………………………….….47ig. 3.14(b) Measured and simulated H-plane radiation pattern of the capactively-loaded miniaturized slot antenna ……………………………………………….….48ig. 3.15 Input impedance versus frequency with the width (GW) of ground plane as parameter………………………………………………………………….49ig. 3.16 Simulated input return losses for different values of Lm………………….50ig. 3.17 De-embedded input impedance versus frequency with the length (GL) of ground plane as parameter………………………………………………51ig. 3.18 Coupling structure of the slot antenna and the ground plane……………52ig. 3.19 Geometry of miniaturized slot antenna for GPS application………………...53ig. 3.20 Measured and simulated input return losses of the miniaturized slot antenna..... for GPS application.........................................................................................55ig. 3.21(a) Measured and simulated E-plane radiation pattern of the miniaturized slot... antenna for GPS application (1.575 GHz)………………………………...56ig. 3.21(b) Measured and simulated H-plane radiation pattern of the miniaturized slot... antenna for GPS application (1.575 GHz)………………………………57hapter 4ig. 4.1 Geometry of varactor-loaded miniaturized slot antenna………………………62ig. 4.2. Photograph of miniaturized varactor-loaded prototype antenna……………64ig. 4.3 Simulated input return losses of the varactor-loaded miniaturized slot antenna for VDC = 0, 2, 4, 12, 20 V…………………………………………………...66ig. 4.4 Measured input return losses of the varactor-loaded miniaturized slot antenna for VDC = 0, 2, 4, 12, 20 V.…………………………………………………...67ig. 4.5 Measured input return losses of the varactor-loaded miniaturized slot antenna… for different bias voltages……………………………………………………..69ig. 4.6(a) Measured and simulated E-plane radiation pattern of the varactor-loaded…... miniaturized slot antenna for VDC = 12 V………………………………...70ig. 4.6(b) Measured and simulated E-plane radiation pattern of the varactor-loaded…... miniaturized slot antenna for VDC = 4 V………...………………………….71ig. 4.7(a) Measured and simulated H-plane radiation pattern of the varactor-loaded… miniaturized slot antenna for VDC = 12 V…………………………………..72ig. 4.7(b) Measured and simulated H-plane radiation pattern of the varactor-loaded miniaturized slot antenna for VDC = 4 V………...………….........................73amp;#8195;ist of Tableshapter 3able 3.1 Design parameters for half-wavelength slot antenna (1.6GHz)………….….27able 3.2 Design parameters for 5λg /16 long, inductively-loaded slot antenna……….30able 3.3 Design parameters for half-wavelength slot antenna (1.2 GHz)……….……36able 3.4 Design parameters for capacitively-loaded slot antenna…………………….38able 3.5 Initial design parameters for capacitively-loaded miniaturized slot antenna..43able 3.6 Design parameters for the antenna with SMA-to-microstrip transition feeding from the side…………………………………………………………………54hapter 4able 4.1 Design parameters for varactor-loaded miniaturized slot antenna……..……63able 4.2 Input impedance bandwidth versus VDC……………………………………..6
Simple is Better! Lightweight Data Augmentation for Low Resource Slot Filling and Intent Classification
No full textNeural-based models have achieved outstanding performance on slot filling and intent classification, when fairly large in-domain training data are available. However, as new domains are frequently added, creating sizeable data is expensive. We show that lightweight augmentation, a set of augmentation methods involving word span and sentence level operations, alleviates data scarcity problems. Our experiments on limited data settings show that lightweight augmentation yields significant performance improvement on slot filling on the ATIS and SNIPS datasets, and achieves competitive performance with respect to more
complex, state-of-the-art, augmentation approaches. Furthermore, lightweight augmentation is also beneficial when combined with
pre-trained LM-based models, as it improves BERT-based joint intent and slot filling models
A Microwave Subsystem (MS) Capable of Realizing Functional Change with the Aid of 2D-shaped Liquid Metal (LM)
No full textThis paper presents the first microwave subsystem (MS) capable of changing its function, in this case between resonator and antenna, using liquid metal (LM). This is achieved by filling/emptying fluidic channels with Gallium-based LM and forming LM into different 2D shapes. The manufactured prototype of the proposed MS performs as a slot antenna, when the fluidic channels are empty of LM. On the other hand, it operates in resonator mode, when the fluidic channels are filled with LM. We also connected two MSs along with a microstrip resonator to realize functional change between complex functions i.e., antenna and filter. The proposed connection of MSs can act as a filter when the fluidic channels are filled with LM or as an antenna when LM is withdrawn from the fluidic channels. When operating in the antenna mode the proposed connection of MSs provides a measured peak realized gain of 7.23 dBi and a simulated total efficiency of 84%. When operating in the filter mode the connection of MSs provides a band pass response and exhibits a minimum insertion loss of 1.9 dB, within the passband. The filters 10 dB return loss bandwidth, of 340 MHz, ranges from 2.28 GHz to 2.62 GHz
Possibilities and testing of CPRNG in block cipher mode of operation PM-DC-LM
No full textThis paper discusses the chaotic pseudo-random number generator (CPRNG), which is used in block cipher mode of operation called PM-DC-LM. PM-DC-LM is one of possible subversions of general PM mode. In this paper is not discussed the design of PM-DC-LM, but only CPRNG as a part of it because designing is written in other papers. Possibilities, how to change or to improve CPRNG are mentioned. The final part is devoted for a little testing of CPRNG and some testing data are shown. © 2016 Author(s)
CF/LM-PAEK: Characterisation and sensitivity to critical process parameters for automated fibre placement
No full textThis paper presents an investigation into Automated Fibre Placement process parameters for a novel carbon-fibre-reinforced thermoplastic material based on a low-melt polyaryl ether ketone polymer matrix (CF/LM-PAEK). The primary focus of this investigation is in-situ consolidation, with parameter sets for sample manufacturing selected based on a Design of Experiment method and analysed by means of mechanical and thermal testing. For in-situ consolidation, a maximum shear strength of 33.6 MPa and a crystallinity of 27.3% is achieved. Subsequent tempering increases shear strength up to 46.5 MPa and crystallinity up to 32%. The material was found to be insensitive to layup speed within the tested parameter range (1–15 m/min), achieving similar results for high layup speeds
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