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All-optical XOR gates based on dual semiconductor optical amplifiers 基于双半导体光放大器的全光XOR门
Cogent Physics Pub Date : 2019-01-01 DOI: 10.1080/23311940.2019.1660495
Xiang Zhang, S. Thapa, N. Dutta
{"title":"All-optical XOR gates based on dual semiconductor optical amplifiers","authors":"Xiang Zhang, S. Thapa, N. Dutta","doi":"10.1080/23311940.2019.1660495","DOIUrl":"https://doi.org/10.1080/23311940.2019.1660495","url":null,"abstract":"Abstract Recent progress of high-speed all-optical logic gates based on dual semiconductor optical amplifiers (SOAs) has been reviewed in this article. These schemes include using quantum-dot semiconductor optical amplifier (QD-SOA) and two-photon absorption (TPA). Numerical simulation method was presented by solving the rate equations of gain dynamics in the SOA. Performance of all-optical logic operation is discussed by calculating the quality factor and plotting the eye diagram. Results show that the dual SOA scheme is a promising method for the realization of high-speed all-optical logic systems in the future.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2019.1660495","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43295084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Different methods to achieve hybrid mode locking 实现混合模式锁定的不同方法
Cogent Physics Pub Date : 2019-01-01 DOI: 10.1080/23311940.2019.1707624
Wenbo Li
{"title":"Different methods to achieve hybrid mode locking","authors":"Wenbo Li","doi":"10.1080/23311940.2019.1707624","DOIUrl":"https://doi.org/10.1080/23311940.2019.1707624","url":null,"abstract":"Abstract Mode locked pulse generation has been reported using both active and passive mode locking schemes. Active mode locking technique has been proven to be an effective way to generate high-repetition-rate pulses by incorporating a modulator inside the laser cavity. Compared to actively mode locked lasers, passively mode locked lasers can generate pulse train at ultrashort pulse width but with relatively lower repetition rate. Thus, it is a brilliant idea to build a hybrid mode locked system combining both active and passive mode lockers. In this review, several hybrid mode locked fiber ring laser systems are discussed and summarized. Hybrid mode locking is a promising method to generate high-speed ultrashort optical pulses for fiber-optic telecommunication system.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2019.1707624","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45741261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The interboundary properties and kinematics of N719 dye with titania photoanode framework and spectral responses with different electrolytes 具有二氧化钛光阳极骨架的N719染料的界间性质和运动学以及不同电解质的光谱响应
Cogent Physics Pub Date : 2018-01-01 DOI: 10.1080/23311940.2018.1498146
T. Abodunrin, A. Boyo, M. Usikalu
{"title":"The interboundary properties and kinematics of N719 dye with titania photoanode framework and spectral responses with different electrolytes","authors":"T. Abodunrin, A. Boyo, M. Usikalu","doi":"10.1080/23311940.2018.1498146","DOIUrl":"https://doi.org/10.1080/23311940.2018.1498146","url":null,"abstract":"Abstract Titanium oxide is as ancient in age as our planet but its use for photoanode is more recent. It exists naturally as rutile (the second most abundant), anatase and brookite ores. The anatase several metastable states trigger diverse spectral responses with Magnifera Indica Linn. (M.indica L) dye as it is synthesized with an N719 dye grown on its matrix. Facile doctor blade method and high temperature sintering at 723 K were used in fabrication. Doping of titanium oxide in effect lowers the band gap of TiO2 for photo-excitation caused by a bathochromic shift and simultaneously decreases the rate of recombination in photogenerated electron–hole pairs. This study explored the visible light induced photocatalytic action of doped M.indica L DSSC towards reduction of titanium oxide bandgap. The SEM micrographs reveal the molecular interactions and the interplay as electrolytes percolate the intricate N719 dye/Titania framework. Detailed analysis stem from comparison of M.indica L crude faction and the batch separated faction using FTIR spectroscopy. The absorbance peak, rates of reaction and % transmittance identify the particular chromophores responsible for the reaction. Result shows the batch-separated hexane faction approximately 1000 times more efficient than its crude faction although the ff of the crude was only about twice that of the hexane faction. The optical study showed that doping ions lead to an increase in the absorption edge wavelength, and a decrease in the band gap energy of TiO2 nanoparticles. The doped TiO2 nanoparticles in general showed higher photocatalytic activities than the pure ones.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2018.1498146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60085518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A dynamic closure modeling framework for large eddy simulation using approximate deconvolution: Burgers equation 近似反卷积大涡模拟的动态闭合建模框架:Burgers方程
Cogent Physics Pub Date : 2018-01-01 DOI: 10.1080/23311940.2018.1464368
R. Maulik, O. San
{"title":"A dynamic closure modeling framework for large eddy simulation using approximate deconvolution: Burgers equation","authors":"R. Maulik, O. San","doi":"10.1080/23311940.2018.1464368","DOIUrl":"https://doi.org/10.1080/23311940.2018.1464368","url":null,"abstract":"Abstract We put forth a dynamic closure modeling framework for the large eddy simulations of the Burgers equation based upon the use of the approximate deconvolution (AD) procedure to compute the Smagorinsky constant self-adaptively from the resolved flow quantities. In our proposed framework, the test filtering process of the standard dynamic model is replaced by the AD procedure. The robustness of the model has been tested considering the Burgers equation in its conservative and skew-symmetric forms. Our numerical assessments for solving the single-mode sine wave and the decaying Burgers turbulence problems show that the present framework effectively damps grid-to-grid oscillations and yields an improved shock capturing property for central numerical schemes as underlying discretizations.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2018.1464368","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46173259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Irreversible thermodynamics of ideal plastic deformation 理想塑性变形不可逆热力学
Cogent Physics Pub Date : 2018-01-01 DOI: 10.1080/23311940.2018.1496613
K. Ogawa, T. Ichitsubo, S. Ishioka
{"title":"Irreversible thermodynamics of ideal plastic deformation","authors":"K. Ogawa, T. Ichitsubo, S. Ishioka","doi":"10.1080/23311940.2018.1496613","DOIUrl":"https://doi.org/10.1080/23311940.2018.1496613","url":null,"abstract":"Abstract Thermodynamics for ideal plastic deformation causing no disorganization of the structure in the deformed body, which was discussed by P. W. Bridgman studied (1950), revealed that the concept of entropy was still applicable to its irreversible process. Noting that the structural invariability in an ideal plastic body is physically equivalent to the prerequisite of thermodynamics, namely, thermodynamic quantities must be independent of the macroscopic body shape, the generalized concept of entropy can be extended to the other thermodynamic potentials such as internal energy, free energies and so on. Here the extended generalization for ideal plastic deformation is theoretically justified on the basis of the irreversible thermodynamics constructed by Prigogine and his discipline. Thermodynamic state of the ideally deformed body is found to be specified both by the generalized thermodynamic potential (S, U, F, H or G) and by the irreversible potential energy J which drives the plastic deformation.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2018.1496613","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48128522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radon radioactivity measurements in underground water: A comparison between different diagnostics techniques 地下水中氡放射性测量：不同诊断技术的比较
Cogent Physics Pub Date : 2018-01-01 DOI: 10.1080/23311940.2018.1480134
F. Caridi, G. Belmusto
{"title":"Radon radioactivity measurements in underground water: A comparison between different diagnostics techniques","authors":"F. Caridi, G. Belmusto","doi":"10.1080/23311940.2018.1480134","DOIUrl":"https://doi.org/10.1080/23311940.2018.1480134","url":null,"abstract":"Abstract In this article, authors report experimental results obtained, with different diagnostics setups, for radon activity concentration measurement in underground water for human use. An overview is given about the performance of different measurement techniques, based on experimental data. The following parameters are compared and discussed: counting efficiency, minimum detectable activity, measurement uncertainty, background, sample volume and treatment. The estimated average value for radon-specific activity in underground water was compared with that one derived from different legislations and directives/guidelines and it was used, with the dose conversion factor for 222Rn, to estimate the annual effective dose, for adult members of public of the investigated region, due to the groundwater radon ingestion.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2018.1480134","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41564940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
New exact wave solutions to the space-time fractional-coupled Burgers equations and the space-time fractional foam drainage equation 时空分数阶耦合Burgers方程和时空分数阶泡沫排水方程的新精确波解
Cogent Physics Pub Date : 2018-01-01 DOI: 10.1080/23311940.2017.1422957
M. N. Islam, M. Akbar
{"title":"New exact wave solutions to the space-time fractional-coupled Burgers equations and the space-time fractional foam drainage equation","authors":"M. N. Islam, M. Akbar","doi":"10.1080/23311940.2017.1422957","DOIUrl":"https://doi.org/10.1080/23311940.2017.1422957","url":null,"abstract":"Abstract The space-time fractional-coupled Burgers equations and the space-time fractional foam drainage equation are important as an electro-hydro-dynamical model to progress the local electric field and ion acoustic waves in plasma, the shallow water wave problems, and also fluid flow of liquid through foam arisen by gravity and capillarity. In this article, we determine new and further general exact wave solutions to the above-mentioned space-time fractional equations using the generalized (G′/G)-expansion method with the assistance of the fractional complex transformation. It is shown that the method is further effective, convenient, and can be used to establish new solutions for other kind non-linear fractional differential equations arising in mathematical physics. Finally, we depict the 3D and 2D figures of the obtained wave solutions in order to interpret them in geometrical sense.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2017.1422957","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48986274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
High Speed All-Optical Logic Gate Using QD-SOA and its Application 基于QD-SOA的高速全光逻辑门及其应用
Cogent Physics Pub Date : 2017-01-01 DOI: 10.1080/23311940.2017.1388156
Hongyu Hu, Xiang Zhang, Shuai Zhao
{"title":"High Speed All-Optical Logic Gate Using QD-SOA and its Application","authors":"Hongyu Hu, Xiang Zhang, Shuai Zhao","doi":"10.1080/23311940.2017.1388156","DOIUrl":"https://doi.org/10.1080/23311940.2017.1388156","url":null,"abstract":"The scheme to realize high-speed (~250 Gb/s) all-optical Boolean logic gates using semiconductor optical amplifiers with quantum-dot (QD-SOA) is introduced and analyzed in this review. Numerical si...","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2017.1388156","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60084864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Investigation on the influence of LaCl3 concentration on the electrical conduction mechanism of chemical-bath deposited LaF3/porous-silicon structure LaCl3浓度对化学镀液沉积LaF3/多孔硅结构导电机理影响的研究
Cogent Physics Pub Date : 2017-01-01 DOI: 10.1080/23311940.2017.1299559
Md. Hafijur Rahman, A. Ismail
{"title":"Investigation on the influence of LaCl3 concentration on the electrical conduction mechanism of chemical-bath deposited LaF3/porous-silicon structure","authors":"Md. Hafijur Rahman, A. Ismail","doi":"10.1080/23311940.2017.1299559","DOIUrl":"https://doi.org/10.1080/23311940.2017.1299559","url":null,"abstract":"Abstract Effect of LaCl3 concentration on the electrical conduction mechanism of LaF3/porous silicon (PS) structure has been investigated in this work. LaF3 layers have been deposited by a novel chemical bath deposition (CBD) technique. With this simple technique, LaF3 produced as LaCl3 are made to react with hydrofluoric (HF) acid on the porous silicon substrate. This enables direct deposition of LaF3 on the pore walls of the porous silicon leading to a successful passivation of PS. The compositions of the deposited LaF3 were confirmed by Energy Dispersive of X-ray (EDX) analysis. The electrical conduction study has been done by impedance analyzer (HP4294A). From this study it can be concluded that the conductance increases with LaCl3 concentration but decreases for higher concentration.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2017.1299559","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43152451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Revisiting the ground state phase stability of super-heavy element Flerovium 重估超重元素florovium的基态相稳定性
Cogent Physics Pub Date : 2017-01-01 DOI: 10.1080/23311940.2017.1380454
H. Maiz Hadj Ahmed, A. Zaoui, M. Ferhat
{"title":"Revisiting the ground state phase stability of super-heavy element Flerovium","authors":"H. Maiz Hadj Ahmed, A. Zaoui, M. Ferhat","doi":"10.1080/23311940.2017.1380454","DOIUrl":"https://doi.org/10.1080/23311940.2017.1380454","url":null,"abstract":"Abstract We apply density-functional theory (DFT) using full potential linearized augmented plane wave (FP-LAPW) method to revisiting the electronic structure properties of super-heavy element 114, namely Flerovium (Fl). For the structural properties, among the four phases investigated here (fcc, bcc, hcp, and sc), we found that the face-centered-cubic phase is the ground state of Fl, discarding the hexago- nal-close-packed ground state phase found previously. Interestingly, it is found that the bcc phase competes strongly with the fcc phase for the ground stability, since the total energy difference between the fcc and bcc structures are extremely small (~1 meV). The other structures (i.e. hcp and sc) remain energetically higher, and thus do not compete for the phase stability of this element. The lattice dynamics calculations provide strong support for the calculated static ground state phase of super-heavy element 114, capturing the dynamical stability of the face-centered cubic phase and the dynamical instability of the body-centered cubic phase.","PeriodicalId":43050,"journal":{"name":"Cogent Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23311940.2017.1380454","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43283323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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