Optical Properties of Dielectric-Graphene Left Hand Material Structure

MRS Advances ◽  
2019 ◽  
Vol 4 (53) ◽  
pp. 2907-2912
Author(s):  
R. Hinojosa-Domínguez ◽  
J. S. Pérez-Huerta ◽  
D. Ariza-Flores ◽  
I. A. Sustaita-Torres ◽  
J. Madrigal-Melchor
Keyword(s):  
Optical Properties ◽  
Absorption Spectra ◽  
Light Polarization ◽  
Material Structure ◽  
Left Hand ◽  
System Building ◽  
Left Handed ◽  
Line Form ◽  
Left Hand Material ◽  
Transmission And Absorption

ABSTRACTIt is well known the remarkable optical properties of both graphene and left handed materials, for which we study the optical properties of a multilayer system building by graphene-dielectric-left hand material. In this work, we show the transmission, reflection and absorption spectra for a different set of parameters of the left-handed material structure. It is important to highlight that the inclusion of graphene remarkably modifies the transmission and absorption spectra. The optical properties of the graphene-LHM can be modulated via the different parameters of system. We showed that the fill function do not change the line form of the spectra, however, modify their amplitudes. With respect to light polarization, it’s possible to observe that the spectra are widen for TM respect to TE polarization.

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

Influence of Bi2O3 on Borophosphate Glasses Properties

2014 ◽  
Vol 979 ◽  
pp. 343-346 ◽  
Author(s):  
Natthakridta Chanthima ◽  
Jakrapong Kaewkhao
Keyword(s):  
Optical Properties ◽  
Molar Volume ◽  
Absorption Spectra ◽  
Packing Density ◽  
Visible Range ◽  
Melt Quenching ◽  
Borophosphate Glasses ◽  
Borophosphate Glass ◽  
Uv Visible

Borophosphate glasses have been synthesized with a Bi2O3concentration of 15.0 to 25.0 mol%, added 2.5 mol% for each concentration, by the normal melt quenching technique at 1200 °C. The physical and optical properties of bismuth borophosphate glass systems have been studied. The glasses are characterized for their physical and optical properties. The density and molar volume of these glasses were found in the range 3.4391 to 3.9338 g/cm3and 52.2515 to 55.7557 cm3/mol, respectively. It was observed that the density and molar volume of these glasses was increased with increasing the concentration of Bi2O3. The absorption spectra of these glasses were recorded in the UV-Visible range. It has been found that, the absorption spectra were shifted to longer wavelength with higher Bi2O3concentration. In addition, the oxygen packing density of glass samples have been also investigated.

Sol–gel synthesis and optical properties of titanium dioxide thin film

2018 ◽  
Vol 32 (09) ◽  
pp. 1850076 ◽  
Author(s):  
Irfan Ullah ◽  
Shaukat Ali Khattak ◽  
Tanveer Ahmad ◽  
Saman ◽  
Nayab Ali Ludhi
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Band Gap ◽  
Surface Defects ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Localized States ◽  
Indirect Transition ◽  
Transmission And Absorption

The titanium dioxide (TiO2) is synthesized by sol–gel method using titanium-tetra-iso-propoxide (TTIP) as a starting material, and deposited on the pre-cleaned glass substrate using spin coating technique at optimized parameters. Energy dispersive X-ray (EDX) spectroscopy confirms successful TiO2 growth. The optical properties concerning the transmission and absorption spectra show 85% transparency and 3.28 eV wide optical band gap for indirect transition, calculated from absorbance. The exponential behavior of absorption edge is observed and attributed to the localized states electronic transitions, curtailed in the indirect band gap of the thin film. The film reveals decreasing refractive index with increasing wavelength. The photoluminescence (PL) study ascertains that luminescent properties are due to the surface defects.

Mixed Handedness and Achievement Test Scores of Middle School Boys

2008 ◽  
Vol 107 (2) ◽  
pp. 497-506
Author(s):  
P. S. B. Sarma
Keyword(s):  
Middle School ◽  
At Risk ◽  
Test Scores ◽  
Fourth Grade ◽  
Achievement Test ◽  
Normal Curve ◽  
Left Hand ◽  
Left Handed ◽  
Academic Deficits ◽  
The Right

The purpose of the study was to replicate findings of an earlier study of fourth grade boys manifesting mixed handedness with a sample. Among 32 mixed-handed boys in Grades 6 to 8, the right-handed writer, left-handed thrower group obtained low spelling scores (Normal Curve Equivalent Scores) on the California Achievement Test significantly more frequently than the left-handed writer, right-handed thrower group. These findings are consistent with data for Grade 4 boys in the earlier study. Findings strengthen the hypotheses that mixed handedness is not a unitary neuropsychological entity and that boys who write with the right hand and throw with the left hand might be at risk for certain academic deficits.

scholarly journals Hand Preference and Creativity of Papua University Student

2022 ◽  
Vol 8 (1) ◽  
pp. 257-262
Author(s):  
Vionita Putri ◽  
Elda Irma Jeanne Joice Kawulur ◽  
Febriza Dwiranti ◽  
Sabarita Sinuraya ◽  
Sita Ratnawati
Keyword(s):  
Hand Preference ◽  
University Student ◽  
Creative People ◽  
Left Hand ◽  
Adjective Check List ◽  
Left Handed ◽  
Males And Females ◽  
Papua Barat ◽  
The Right ◽  
Descriptive Method

Human has a preference to use their hands for various manual activities. Left-handed preference is people who tend to use their left hand to perform various manual activities, while right-handed people tend to use right-handed. Any researches show that the left-handed preference for more creativity was influenced by the dominant use of the right brain and bigger corpus callosum. The research aims to determine the percentage of left-handed preference and their creativity in Universitas Papua, Manokwari Papua Barat. The method used in this research is the descriptive method. Data collection used a questionnaire to evaluate individual hand preference using Handedness Questionnaire and to determine individual creativity using Adjective Check List. The percentage of left-handed people in UNIPA were 9.3% or lower than right-handed and higher than ambidextrous. Our study supports the statement about selection in handedness in the traditional society which showed a higher percentage of left-hander as advantages related to using hand intensively.  The percentage of left-handed males and females was almost equal and strongly left-handed was higher in females. The percentage of creative people was higher in left-handed, especially in males

Piano Concertos for the Left Hand by Ravel and Prokofiev: Two Answers to One Order

2020 ◽  
pp. 67-91
Author(s):  
В.И. Чернышов
Keyword(s):  
Significant Contribution ◽  
Maurice Ravel ◽  
Musical Language ◽  
Sergei Prokofiev ◽  
Piano Concerto ◽  
Left Hand ◽  
Left Handed ◽  
Piano Literature ◽  
The One ◽  
Piano Concertos

Пианист Пауль Витгенштейн, желая расширить и обновить свой концертный репертуар, внес в XX веке существенный вклад в фортепианную литературу для левой руки. В 1929–1930 годах он заказывает фортепианный концерт сначала Морису Равелю, а затем Сергею Прокофьеву. Это оказалось возможным благодаря наследству, полученному пианистом после смерти отца — сталелитейного магната Карла Витгенштейна. Если Равелю удалось, хоть и не полностью, удовлетворить потребности заказчика, то Прокофьеву было вовсе отказано в исполнении его музыки. Одной из главных причин неудачи Прокофьева можно считать творческий кризис конца зарубежного периода, когда композитор находился в поисках нового музыкального языка — «новой простоты». В статье прослеживается и сравнивается судьба этих произведений; устанавливаются причины сравнительной невостребованности концерта Прокофьева исполнителями; анализируется композиция, фортепианная фактура и техника, оркестровка. Освещены биографические факты из жизни Пауля Витгенштейна, а также непростые отношения между заказчиком и композиторами. In the twentieth century, the one-armed pianist Paul Wittgenstein made a significant contribution to piano literature for the left hand, which was due to his wish to broaden and update his concert repertoire. In 1929–1930 he ordered a left-handed piano concerto first to Maurice Ravel and then to Sergei Prokofiev. It was possible through the inheritance that Wittgenstein received after the death of his father, the steel magnate Karl Wittgenstein. While Ravel was able to meet the client’s needs, though not completely, Prokofiev was completely denied the performance of his music. One of the main reasons for Prokofiev’s failure might be the creative crisis of the end of the foreign period, when the composer was in search of a new musical language — “the new simplicity”. The article traces and compares the destiny of these piano concertos, specifying the reasons for the relative lack of demand for Prokofiev’s left-handed concerto on behalf of performers. The article also analyzes music, piano texture and technique, form, orchestration of the lefthanded concertos. Special attention is paid to biographical facts from Paul Wittgenstein’s life, as well as uneasy relationship between the client and the composers.

Kolisch, Rudolf (1896–1978)

2018 ◽  
Author(s):  
Daniel Bangert
Keyword(s):  
World War I ◽  
World War ◽  
Chamber Works ◽  
Second Viennese School ◽  
Left Hand ◽  
University Of Vienna ◽  
University Of Wisconsin ◽  
Left Handed ◽  
Postgraduate Studies ◽  
The University

Rudolf Kolisch was an Austrian-born violinist, teacher, and conductor. As leader of the Kolisch Quartet he premiered many important chamber works by the Second Viennese School and other modernist composers of the first half of the twentieth century. He later became leader of the Pro Arte Quartet and taught at the University of Wisconsin in Madison and at the New England Conservatory in Boston. Kolisch was born in Klamm am Semmering, Austria on 20 July 1896. His father Rudolf was a doctor and his mother Henriette a pianist. Soon after starting violin lessons, an injury to his left hand led him to hold the violin in his right hand and bow left-handed. He attended the Vienna Music Academy and the University of Vienna, but his postgraduate studies were interrupted by three years of service in the Austrian army during World War I. His teachers included the Czech violinist Otakar Ševčík, the composer Franz Schrecker, and the musicologist Guido Adler.

Analytical Delta-Four-Stream Doubling–Adding Method for Radiative Transfer Parameterizations

2013 ◽  
Vol 70 (3) ◽  
pp. 794-808 ◽  
Author(s):  
Feng Zhang ◽  
Zhongping Shen ◽  
Jiangnan Li ◽  
Xiuji Zhou ◽  
Leiming Ma
Keyword(s):  
Optical Properties ◽  
Radiative Transfer ◽  
Transfer Process ◽  
Solar Spectrum ◽  
Single Layer ◽  
Discrete Ordinates ◽  
Discrete Ordinates Method ◽  
Atmospheric Profile ◽  
Relative Errors ◽  
Transmission And Absorption

Abstract Although single-layer solutions have been obtained for the δ-four-stream discrete ordinates method (DOM) in radiative transfer, a four-stream doubling–adding method (4DA) is lacking, which enables us to calculate the radiative transfer through a vertically inhomogeneous atmosphere with multiple layers. In this work, based on the Chandrasekhar invariance principle, an analytical method of δ-4DA is proposed. When applying δ-4DA to an idealized medium with specified optical properties, the reflection, transmission, and absorption are the same if the medium is treated as either a single layer or dividing it into multiple layers. This indicates that δ-4DA is able to solve the multilayer connection properly in a radiative transfer process. In addition, the δ-4DA method has been systematically compared with the δ-two-stream doubling–adding method (δ-2DA) in the solar spectrum. For a realistic atmospheric profile with gaseous transmission considered, it is found that the accuracy of δ-4DA is superior to that of δ-2DA in most of cases, especially for the cloudy sky. The relative errors of δ-4DA are generally less than 1% in both the heating rate and flux, while the relative errors of δ-2DA can be as high as 6%.

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