The influence of phase-modulation on femtosecond time-resolved coherent Raman spectroscopy

The influence of phase-modulation on femtosecond time-resolved coherent Raman scattering is investigated theoretically and experimentally. The coherent Raman signal taken as a function of the spectral position shows unexpected temporal oscillations close to time zero. A theoretical analysis of the coherent Raman scattering process indicates that the femtosecond light pulses are amplitude and phase modulated. The pulses are asymmetric in time with more slowly decaying trailing wings. The phase of the pulse amplitude contains quadratic and higher-order contributions

Review: Progress in the Studies on Mechanical Properties of Materials

Materials science and engineering is one of the hot research topics in the world, among which mechanical properties of materials play a critical role in application of the new materials. Based on this, a special session Mechanical Properties of Materials was held within the 2nd Global Conference on Materials Science and Engineering, Nov. 20–22, 2013. This special issue contains a selection of twenty scientific papers, which are focused on the structure, mechanical properties, and strength of materials. In this review, the selected papers from the special session are summarized.Материаловедение и инженерия относятся к наиболее актуальным направлениям научных исследований в мире, а применение новых материалов в значительной степени основывается на изучении механических свойств материалов. Исходя из этого в рамках 2-й Глобальной конференции по материаловедению и инженерии 20–22 ноября 2013 года была проведена специальная сессия по вопросам исследования механических свойств материалов. Этот специальный номер содержит подборку из 20 научных работ, отобранных из числа всех докладов, посвященных проблемам структуры, механических свойств и прочности материалов. В данном обзоре обсуждаются отдельные доклады специальной сессии, представленные в этом номере журнала.Матеріалознавство та інженерія відносяться до найбільш актуальних напрямків наукових досліджень у світі, тоді як використання нових матеріалів у значній мірі базується на дослідженні механічних властивостей матеріалів. Виходячи з цього, у межах 2-ї Глобальної конференції з матеріалознавства й інженерії 20–22 листопада 2013 року було проведено спеціальну сесію з питань дослідження механічних властивостей матеріалів. Цей спеціальний номер містить добірку з 20 наукових робіт,відібраних із числа всіх доповідей, присвячених проблемам структури, механічних властивостей і міцності матеріалів. У даному огляді обговорюються окремі доповіді спеціальної сесії, представлені в цьому номері журналу

Pulsars as Fantastic Objects and Probes

Pulsars are fantastic objects, which show the extreme states of matters and plasma physics not understood yet. Pulsars can be used as probes for the detection of interstellar medium and even the gravitational waves. Here I review the basic facts of pulsars which should attract students to choose pulsar studies as their future projects.Comment: Invited Lecture on the "First Kodai-Trieste Workshop on Plasma Astrophysics", Kodaikanal Obs, India. Aug.27-Sept.7th, 2007. In: "Turbulence, Dynamos, Accretion Disks, Pulsars and Collective Plasma Processes". Get a copy from: http://www.springerlink.com/content/978-1-4020-8867-

Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model

We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10-25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering. © 2019 American Physical Society

Erratum: "A Gravitational-wave Measurement of the Hubble Constant Following the Second Observing Run of Advanced LIGO and Virgo" (2021, ApJ, 909, 218)

[no abstract available

Computation speedup of macromodels for dynamic simulation of microsystem

2002 International Conference on Modeling and Simulation of Microsystems - MSM 2002368-37

Bidirectional bending of laminated composite plates using an improved zig-zag model

Composite Structures283283-294COMS

Proper orthogonal modes and component mode synthesis in macromodel generation for complex MEMS device simulation

2003 Nanotechnology Conference and Trade Show - Nanotech 20032542-54

Novel chemical recycling of polycarbonate (PC) waste into bishydroxyalkyl ethers of bisphenol A for use as PU raw materials

An efficient process for the chemical recycling of polycarbonate (PC) waste into diols of bisphenol A (BPA) for use as raw materials in PU production has been developed. Digestion of PC waste in alkylene glycols, i.e., ethylene glycol (EG) and propylene glycol (PG), with a catalytic amount of sodium carbonate at 180 degrees C under normal atmospheric pressure afforded partial alkoxylation products of BPA. This initial product mixture was found to consist of BPA (28%) and monohydroxyethyl ether (MHE-BPA, 40%) and bishydroxyethyl ether of bisphenol A (BHE-BPA, 25%) when digested in EG solution. Whereas, in PG digestion solution, the corresponding digestion products consist of monohydroxypropyl ether of BPA (MHP-BPA, 53%) and bishydroxypropyl ether of BPA (BHP-BPA, 21%), with the rest being un-propoxylated BPA. When these digested solutions were further treated with molar excess of urea with a catalytic amount of zinc oxide at 180 degrees C, BHE from EG or BHP-BPA from PG was produced in high yields. In both digestion processes, cyclic alkylene carbonates, i.e. ethylene carbonate (EC) or propylene carbonate (PPC), were observed as the transient intermediates which eventually disappear during the prolonged alkoxylation conditions. ZnO was added to the second step as the catalyst to accelerate urea's trans-esterification process. Both BHE and BHP products have been sucessfully utilized in making PU polymers with good mechanical properties. This chemical approach thus provides a viable alternative for PC recycling