There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Hydrodynamic and hydromagnetic stability

Recent years have witnessed many breakthroughs in research on graphene (the first two-dimensional atomic crystal) as well as a significant advance in the mass production of this material. This one-atom-thick fabric of carbon uniquely combines extreme mechanical strength, exceptionally high electronic and thermal conductivities, impermeability to gases, as well as many other supreme properties, all of which make it highly attractive for numerous applications. Here we review recent progress in graphene research and in the development of production methods, and critically analyse the feasibility of various graphene applications.

/pdf/a-roadmap-for-graphene-1nstzmbk5x.pdf

A roadmap for graphene

Intense ultrashort light pulses comprising merely a few wave cycles became routinely available by the turn of the millennium. The technologies underlying their production and measurement as well as relevant theoretical modeling have been reviewed in the pages of Reviews of Modern Physics (Brabec and Krausz, 2000). Since then, measurement and control of the subcycle field evolution of few-cycle light have opened the door to a radically new approach to exploring and controlling processes of the microcosm. The hyperfast-varying electric field of visible light permitted manipulation and tracking of the atomic-scale motion of electrons. Striking implications include controlled generation and measurement of single attosecond pulses of extreme ultraviolet light as well as trains of them, and real-time observation of atomic-scale electron dynamics. The tools and techniques for steering and tracing electronic motion in atoms, molecules, and nanostructures are now becoming available, marking the birth of attosecond physics. In this article these advances are reviewed and some of the expected implications are addressed. 

Attosecond physics

Abstruct-ExperimentaI results are presented for subpicosecond pulse propagation on normal-metal, coplanartransmission-line structures. The pulse distortion that occurs is modelled using a semiempirical curve fit to the fullwave analysis for the modal dispersion and quasi-static approximations for the conductor and radiation loss. Without using any adjustable parameters, very good agreement is obtained for the delay, rise time and amplitude of the pulse for various propagation distances. For terahertz-bandwidth pulses on lines similar to the one studied, the modal dispersion and radiation losses are the dominant pulse-shaping mechanisms. ICOSECOND pulses propagating on normal-metal, P coplanar-circuit interconnects are degraded by the dispersion and attenuation characteristics of these guided-wave structures [ 13 - [3]. The dispersion of a coplanar transmission line arises primarily due to the dielectric inhomogeneity at the surface [4] and the complex surface impedance of the electrodes. The attenuation is due to the conductor losses, substrate conductivity losses and radiation or surface wave losses [5]. Modeling of picosecond pulse propagation on coplanar lines needs to incorporate the previous effects, while trying to retain simplicity in computation through the use of approximations verified via simulations and experiments. In this letter, we present experimental results on subpicosecond pulse propagation on normal-metal coplanar-waveguide (CPW) transmission lines defined on a semi-insulating GaAs substrate. We have considerably extended the bandwidth as compared to previously published results [ 13 - [3], and data for various propagated distances are presented. Simulation is done using a semiempirical curve fit to the fullwave analysis for modal dispersion [4], and quasi-static approximation for the conductor [l] and radiation loss [6]. Excellent agreement is obtained for the important pulse parameters-propagation delay, rise time and pulse amplitude -without the use of any adjustable parameters. For the typical dimensions of the coplanar lines and the frequency bandwidth of the pulse considered here, the distortion of the pulse shape is dominated by the modal dispersion (caused by the dielectric mismatch at the surface), and the loss is domi

http://ieeexplore.ieee.org/iel4/75/2767/00084569.pdf

Waveguides : Experiment and Simulation

Elektro-elektronenoptisches Oszilloskop zur Zeitauflösung elektrischer Wellenzüge im Picosekundenbereich

Using femtosecond microscopy, we observe a thermal/ionization front expand radially at ∼108cm/s from a λ2‐size spot of an aluminum target excited at >1018W/cm2. Numerical modeling shows transport is predominantly radiative and may be initially nonlocal.

/pdf/ultrafast-radial-transport-in-a-micron-scale-aluminum-plasma-38nhswnoeu.pdf

Ultrafast Radial Transport In A Micron‐Scale Aluminum Plasma Excited At Relativistic Intensity

Summary form only given. We have implemented a demonstration on the linear pre-compensation of self phase modulation (SPM), using a mode-locked Ti:sapphire laser and a pulse shaper using a linear deformable mirror in the Fourier plane of the pulse shaper. The pulses were first stretched in 3.2 cm of glass, sent through the pulse shaper, and injected into 38 cm of single-mode fiber as the nonlinear element. The pulses were then recompressed using a grating pair (400 l/mm), and measured using interferometric autocorrelation.

Linear pre-compensation of SPM-induced pulse distortions with a deformable mirror

Chirped pulse amplification is used to generate 2 mJ pulses of 106 fs duration in an alexandrite amplifier. Compression of the optical pulse is achieved by using a sequence of intracavity prisms in conjunction with diffraction gratings. This allows for the compensation of both linear and quadratic contributions to the dispersion from the amplifier.

Amplification of 100-fs Pulses in Alexandrite Using Chirped Pulse Techniques

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Gerard Mourou

Author Tools

Chat about Author