1,675 research outputs found
Signal Integrity Analysis for High Speed Digital Circuit
This dissertation report marks the commencement of the Final Year Project (FYP)
titled Signal Integrity Analysis for High Speed Digital Circuit. This project is a study on
various signal integrity (SI) issues that could possibly come into play on Printed Circuit
Boards (PCBs). This project is conducted to analyze and grasp a better understanding on
the nature of the problem, how the problem is manifested in circuits and what design
solutions can be employed to minimize its effects. Such a study is not something new but is
definitely getting more crucial as the vast improvement in chip fabrication technology leads
to logic families operating at a much higher speed, resulting to a faster rise time which will
worsen the noise phenomena, i. e. reflection, crosstalk, and power system stability during
component switching. Several causes to signal integrity issues on the printed circuit boards
are analyzed and both proper and improper circuit design techniques are implemented on
the Advanced Design System (ADS) software for data collection and analysis. Deliverables
at the end this project would be the simulation results to support the study, whereby several
simulations are conducted to demonstrate and verify the theoretical study of signal integrity
issues. Besides that, the designs will then be fabricated on a two-layer microstrip board and
tested on the Digital Communication Analyzer (DCA) to obtain more practical results. A
project Gantt chart is attached in the appendix to illustrate the work flow and anticipated
progress
Application of Thoracic Ultrasonography for Acute Cor Pulmonale in Acute Respiratory Distress Syndrome Patients
Beneficial therapeutic interventions for acute respiratory distress syndrome (ARDS) include lung protective ventilation; however, ventilator may cause or sometimes worsen acute cor pulmonale (ACP) induced by pulmonary gas exchange disorder and pulmonary vascular dysfunction due to ARDS. The incidence of ACP was 22–50% in mechanically ventilated patients. Currently, point-of-care ultrasound has been widely used in ARDS patients, which becomes much more important in the early detection and management of ARDS and its complications. Application of lung ultrasound combined with echocardiography could monitor respiratory status, hemodynamics, and cardiac function and optimize the ventilation setting in order to protect both lung and right ventricle. This chapter will discuss the pathophysiology of ACP associated with ARDS and the use of point-of-care ultrasound to make protective strategies for lung and right ventricle in detail
Direct photoluminescence probing of ferromagnetism in monolayer two-dimensional CrBr3
Atomically thin magnets are the key element to build up spintronics based on
two-dimensional materials. The surface nature of two-dimensional ferromagnet
opens up opportunities to improve the device performance efficiently. Here, we
report the intrinsic ferromagnetism in atomically thin monolayer CrBr3,
directly probed by polarization resolved magneto-photoluminescence. The
spontaneous magnetization persists in monolayer CrBr3 with a Curie temperature
of 34 K. The development of magnons by the thermal excitation is in line with
the spin-wave theory. We attribute the layer-number dependent hysteresis loops
in thick layers to the magnetic domain structures. As a stable monolayer
material in air, CrBr3 provides a convenient platform for fundamental physics
and pushes the potential applications of the two-dimensional ferromagnetism.Comment: 27 pages, 10 figure
Learning Multi-Level Information for Dialogue Response Selection by Highway Recurrent Transformer
With the increasing research interest in dialogue response generation, there
is an emerging branch formulating this task as selecting next sentences, where
given the partial dialogue contexts, the goal is to determine the most probable
next sentence. Following the recent success of the Transformer model, this
paper proposes (1) a new variant of attention mechanism based on multi-head
attention, called highway attention, and (2) a recurrent model based on
transformer and the proposed highway attention, so-called Highway Recurrent
Transformer. Experiments on the response selection task in the seventh Dialog
System Technology Challenge (DSTC7) show the capability of the proposed model
of modeling both utterance-level and dialogue-level information; the
effectiveness of each module is further analyzed as well
Clinical Applications of Near-Infrared Diffuse Correlation Spectroscopy and Tomography for Tissue Blood Flow Monitoring and Imaging
Objective. Blood flow is one such available observable promoting a wealth of physiological insight both individually and in combination with other metrics.
Approach. Near-infrared diffuse correlation spectroscopy (DCS) and, to a lesser extent, diffuse correlation tomography (DCT), have increasingly received interest over the past decade as noninvasive methods for tissue blood flow measurements and imaging. DCS/DCT offers several attractive features for tissue blood flow measurements/imaging such as noninvasiveness, portability, high temporal resolution, and relatively large penetration depth (up to several centimeters).
Main results. This review first introduces the basic principle and instrumentation of DCS/DCT, followed by presenting clinical application examples of DCS/DCT for the diagnosis and therapeutic monitoring of diseases in a variety of organs/tissues including brain, skeletal muscle, and tumor.
Significance. Clinical study results demonstrate technical versatility of DCS/DCT in providing important information for disease diagnosis and intervention monitoring
Enhancing Hydrogen Generation Through Nanoconfinement of Sensitizers and Catalysts in a Homogeneous Supramolecular Organic Framework.
Enrichment of molecular photosensitizers and catalysts in a confined nanospace is conducive for photocatalytic reactions due to improved photoexcited electron transfer from photosensitizers to catalysts. Herein, the self-assembly of a highly stable 3D supramolecular organic framework from a rigid bipyridine-derived tetrahedral monomer and cucurbit[8]uril in water, and its efficient and simultaneous intake of both [Ru(bpy)3 ]2+ -based photosensitizers and various polyoxometalates, that can take place at very low loading, are reported. The enrichment substantially increases the apparent concentration of both photosensitizer and catalyst in the interior of the framework, which leads to a recyclable, homogeneous, visible light-driven photocatalytic system with 110-fold increase of the turnover number for the hydrogen evolution reaction
Electrochemical Synthesis of Rare Earth Ceramic Oxide Coatings
Rare earth ceramic oxides are used in several applications including, phosphors, gas sensors, fuel cells, catalytic converters, and corrosion protection. These materials exhibit attractive properties such as fracture toughness, stiffness, and high strength-to-weight ratios. Synthesis of rare earth oxides includes a long list of techniques, but electrodeposition is one that has not been used as extensively as other techniques. This chapter discusses in detail the electrochemical synthesis of lanthanum, cerium, and praseodymium oxides. The physical and chemical properties of the electrodeposited oxides are characterized by x-ray diffraction, scanning electron microscopy, x-ray photoelectron spectroscopy, and other techniques. The electrochemical synthesis and post-treatment of other rare earth oxides, such as gadolinium, terbium, samarium, neodymium, europium, and dysprosium oxides are also covered in this chapter. Two main mechanisms of electrodeposition for rare earth oxides are discussed in detail
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