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Auteur : Grafiati
Publié le 10 mars 2023

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1

Magann, Alicia B., Gerard McCaul, Herschel A. Rabitz et Denys I. Bondar. « Sequential optical response suppression for chemical mixture characterization ». Quantum 6 (20 janvier 2022) : 626. http://dx.doi.org/10.22331/q-2022-01-20-626.

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The characterization of mixtures of non-interacting, spectroscopically similar quantum components has important applications in chemistry, biology, and materials science. We introduce an approach based on quantum tracking control that allows for determining the relative concentrations of constituents in a quantum mixture, using a single pulse which enhances the distinguishability of components of the mixture and has a length that scales linearly with the number of mixture constituents. To illustrate the method, we consider two very distinct model systems: mixtures of diatomic molecules in the gas phase, as well as solid-state materials composed of a mixture of components. A set of numerical analyses are presented, showing strong performance in both settings.
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2

SAARELA, MIKKO, et TAUNO TAIPALEENMÄKI. « QUANTUM FLUID MIXTURES IN DIFFERENT PHASES ». International Journal of Modern Physics B 17, no 28 (10 novembre 2003) : 5227–42. http://dx.doi.org/10.1142/s0217979203020375.

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Variational theory of quantum fluid mixtures is presented with the emphasis on the stability and phase transitions. We give results on two systems where new interesting phases are predicted. Dilute mixtures of 3 He impurities in the liquid 4 He in two dimensions form loosely bound pairs, dimers. The binding energy of the dimer ranges from milli- to micro-Kelvins with increasing 4 He density. The dimerised mixture of 3 He atoms is stable up to maximum solubility of ≈3%. Electrons and holes in semiconductors form a homogeneous mixture, electron-hole liquid. We predict that at low densities this system becomes unstable against clustering of charges and a liquid phase with a mixture of bound charged clusters could be formed.
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3

Sundaram S, Vasanthi T, Jayaprakash T, Balasubramanian V et Vijayakumar V N. « Optical and thermal studies on binary liquid crystal mixture ». Nanoscale Reports 4, no 1 (30 avril 2021) : 40–51. http://dx.doi.org/10.26524/nr.4.7.

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The novel binaryliquid crystal mixture is designed and synthesized from 4-methoxycinnamic acid (MCA) and 4-ethoxycinnamic acid (ECA). Quantum chemical (DFT) calculation for MCA+ECA geometry is optimized by DFT/B3LYP with 6-311G (d, p) basis set and its results are good agreement with experimental data. Fourier-transform infrared spectroscopic(FT-IR) study confirm the presence of intermolecular hydrogen bond in the liquid crystal mixture .The paramorphic changes in nematic phase and thermo-optic properties of binary liquid crystal mixture isanalyzed using polarizing optical microscope (POM) and differential scanning calorimetry (DSC) techniques. A noteworthy observation in the present liquid crystal mixture possesses smectic A phase along with nematic phases. Intermolecular hydrogen bond interaction and it’s stabilization energy of present mixture is studied by natural bond orbital (NBO) analysis. Due to the transition,the presen tliquid crystal mixtur einduces smecticA phase. The molecular properties of presen t binary liquid crystal mixtureis analyzed by HOMO-LUMO and experimental UV-Visible studies. Thermal spanwidth, stability factor and quantum chemical properties of the liquid crystal mixture are calculated.Molecular electrostatic potential, mulliken atomic charge distribution of the optimized MCA+ECA geometry is also reported.
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4

ROGERS, CAROLINE, et RAJAGOPAL NAGARAJAN. « LOSSLESS QUANTUM DATA COMPRESSION AND QUANTUM KOLMOGOROV COMPLEXITY ». International Journal of Quantum Information 09, no 02 (mars 2011) : 637–50. http://dx.doi.org/10.1142/s0219749911007848.

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We show that the optimal rate of lossless quantum data compression is closely related to Berthiaume, van Dam and Laplante's quantum Kolmogorov complexity. We show that: • The expected quantum Kolmogorov complexity of a mixture is close to the optimal rate of lossless data compression of that mixture. • If quantum Kolmogorov complexity obeys some inequality, then so does the optimal rate of lossless quantum data compression.
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5

Wichert, Andreas. « Quantum-like Gaussian mixture model ». Soft Computing 25, no 15 (11 juin 2021) : 10067–81. http://dx.doi.org/10.1007/s00500-021-05941-9.

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6

Susumu, Kimihiro, H. Tetsuo Uyeda, Igor L. Medintz et Hedi Mattoussi. « Design of Biotin-Functionalized Luminescent Quantum Dots ». Journal of Biomedicine and Biotechnology 2007 (2007) : 1–7. http://dx.doi.org/10.1155/2007/90651.

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We report the design and synthesis of a tetraethylene glycol- (TEG-) based bidentate ligand functionalized with dihydrolipoic acid (DHLA) and biotin (DHLA—TEG—biotin) to promote biocompatibility of luminescent quantum dots (QD's). This new ligand readily binds to CdSe—ZnS core-shell QDs via surface ligand exchange. QDs capped with a mixture of DHLA and DHLA—TEG—biotin or polyethylene glycol- (PEG-) (molecular weight average∼600) modified DHLA (DHLA—PEG600) and DHLA—TEG—biotin are easily dispersed in aqueous buffer solutions. In particular, homogeneous buffer solutions of QDs capped with a mixture of DHLA—PEG600 and DHLA—TEG—biotin that are stable over broad pH range have been prepared. QDs coated with mixtures of DHLA/DHLA—TEG—biotin and with DHLA—PEG600/DHLA—TEG—biotin were tested in surface binding assays and the results indicate that biotin groups on the QD surface interact specifically with NeutrAvidin-functionalized microtiter well plates.
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7

Mancini, S., et P. Tombesi. « Entanglement and nonlocality for a mixture of a pair-coherent state ». Quantum Information and Computation 3, no 2 (mars 2003) : 106–15. http://dx.doi.org/10.26421/qic3.2-2.

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We consider a bipartite continuous variables quantum mixture coming from phase randomization of a pair-coherent state. We study the nonclassical properties of such a mixture. In particular, we quantify its degree of entanglement, then we show possible violations of Bell's inequalities. We also consider the use of this mixture in quantum teleportation. Finally, we compare this mixture with that obtained from a pair-coherent state by single photon loss.
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8

Parks, A. D., S. E. Spence et J. E. Gray. « Exact pointer theories for von Neumann projector measurements of pre- and postselected and preselected-only quantum systems : statistical mixtures and weak value persistence ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 470, no 2162 (8 février 2014) : 20130651. http://dx.doi.org/10.1098/rspa.2013.0651.

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Exact expressions for the mean pointer position, the mean pointer momentum and their variances are obtained for projection operator measurements performed upon ensembles of pre- and postselected (PPS) and preselected-only (PSO) quantum systems. These expressions are valid for any interaction strength which couples a measurement pointer to a quantum system, and consequently should be of general interest to both experimentalists and theoreticians. To account for the ‘collapse’ of PPS states to PSO states that occurs as interaction strength increases and to introduce the concept of ‘weak value persistence’, the exact PPS and PSO pointer theories are combined to provide a pointer theory for statistical mixtures. For the purpose of illustrating ‘weak value persistence’, mixture weights defined in terms of the Bhattacharyya coefficient are used and the statistical mixture theory is applied to mean pointer position data associated with weak value projector measurements obtained from a recent dynamical quantum non-locality detection experiment.
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9

Gutierrez, Emmanuel Mercado, Gustavo Alves de Oliveira, Kilvia Mayre Farias, Vanderlei Salvador Bagnato et Patricia Christina Marques Castilho. « Miscibility Regimes in a 23Na–39K Quantum Mixture ». Applied Sciences 11, no 19 (29 septembre 2021) : 9099. http://dx.doi.org/10.3390/app11199099.

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The effects of miscibility in interacting two-component classical fluids are relevant in a broad range of daily applications. When considering quantum systems, two-component Bose–Einstein condensates provide a well-controlled platform where the miscible–immiscible phase transition can be completely characterized. In homogeneous systems, this phase transition is governed only by the competition between intra- and inter-species interactions. However, in more conventional experiments dealing with trapped gases, the pressure of the confinement increases the role of the kinetic energy and makes the system more miscible. In the most general case, the miscibility phase diagram of unbalanced mixtures of different atomic species is strongly modified by the atom number ratio and the different gravitational sags. Here, we numerically investigate the ground-state of a 23Na–39K quantum mixture for different interaction strengths and atom number ratios considering realistic experimental parameters. Defining the spatial overlap between the resulting atomic clouds, we construct the phase diagram of the miscibility transition which could be directly measured in real experiments.
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10

Polyukhin, A. S. « Modelling of the Thermodynamic Properties of the Plasma Mixture ». Nelineinaya Dinamika 17, no 1 (2021) : 49–57. http://dx.doi.org/10.20537/nd210105.

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Numerical modelling of the thermodynamic properties of plasma mixture is performed using the Thomas – Fermi model with two different approaches. For this purpose, a numerical algorithm, as well as program realization, is developed to solve the Thomas – Fermi equations with quantum-exchange corrections. For the first time a comparison between different methods for taking account of the heterogeneous composition of plasma is made and an algorithm for estimating the corrections for mixtures is developed.
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11

Kumar, Shyambhu, et Ranjit Prasad Yadav. « Semiclassical Theory for Low Density Properties of Polar Hard D-Sphere Fluid Mixtures ». Academic Voices : A Multidisciplinary Journal 5 (30 septembre 2016) : 48–55. http://dx.doi.org/10.3126/av.v5i0.15852.

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In the present paper, expansions are obtained for density-independent pair distribution function and second virial coefficient for D-dimensional molecular fluid mixtures of dipolar hard D-spheres in the semiclassical limit. Numerical results for the second virial coefficient are also estimated for binary mixture of (i) hard spheres and dipolar hard spheres and (ii) hard discs and dipolar hard discs. It is found that the quantum effects increase with increase of dipole moment μ2 as well as the concentration x2. The purpose of the present work is to develop a theory for calculating the low density properties of the polar hard D-sphere fluid mixture in the semiclassical limit. We have also developed the theory for estimating the quantum corrections to the density independent pair distribution function (PDF) and second virial coefficient of the polar D-sphere fluid mixtures.Academic Voices Vol.5 2015: 48-55
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12

Burmistrov, Serguei N., et Takeo Satoh. « Quantum nucleation in a supersaturated liquid3He−4He mixture ». Czechoslovak Journal of Physics 46, S1 (janvier 1996) : 195–96. http://dx.doi.org/10.1007/bf02569513.

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13

Lavrentiev, Vasily, Dagmar Chvostova, Mykhaylo Motylenko, Jiri Vacik, David Rafaja et Alexandr Dejneka. « Quantum plasmon excitations in gold-fullerene mixture films ». Nanotechnology 30, no 36 (18 juin 2019) : 365001. http://dx.doi.org/10.1088/1361-6528/ab2613.

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14

Wu, Yu-Ping, Xing-Can Yao, Hao-Ze Chen, Xiang-Pei Liu, Xiao-Qiong Wang, Yu-Ao Chen et Jian-Wei Pan. « A quantum degenerate Bose–Fermi mixture of41K and6Li ». Journal of Physics B : Atomic, Molecular and Optical Physics 50, no 9 (6 avril 2017) : 094001. http://dx.doi.org/10.1088/1361-6455/aa658b.

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15

Santos, P. T. A., Polyana T. A. Santos, P. M. A. G. Araújo et A. C. F. M. Costa. « ZnAl1.9Eu0.1O4 Nanoparticles Functionalized with Methylmethacrylate and Ethylenediamine Monomer Mixtures ». Materials Science Forum 805 (septembre 2014) : 106–10. http://dx.doi.org/10.4028/www.scientific.net/msf.805.106.

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This work aim to functionalize the ZnAl1.9Eu0.1O4spinel with ethylenediamine and methylmethacrylate monomer mixtures. ZnAl1.9Eu0.1O4nanoparticles were obtained according to the theory of propellants and explosives by combustion reaction. The samples were added to the silane agent 3-aminopropyltriethoxysilane. After silanized were functionalized with a monomers mixture. By X-ray diffractogram, it was observed the formation of a major phase of ZnAl2O4cubic normal spinel and the secondary phase EuAlO3. The FTIR spectra for ZnAl1.9Eu0.1O4exhibit absorption bands below 1000 cm-1, and after the functionalization showed two conjugate bands that were attributed to the presence of free NH2groups and the binding of oxygen to the group NH2, and strips Si-O, originating from the silane agent. The emission spectra for samples before and after functionalization showed spectral lines5D0→7F0,7F1→5D0,5D0→7F2,7F3→5D0and5D0→7F4and luminescence quantum yield of 58%, but the sample functionalized with a mixture monomers showed an increase in intensity on transition5D0→7F2and quantum yield of 67%.
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16

Meister, Matthias, et Albert Roura. « Efficient matter-wave lensing of ultracold atomic mixtures ». Quantum Science and Technology 8, no 2 (25 janvier 2023) : 024001. http://dx.doi.org/10.1088/2058-9565/acb16e.

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Abstract Mixtures of ultracold quantum gases are at the heart of high-precision quantum tests of the weak equivalence principle, where extremely low expansion rates have to be reached with matter-wave lensing techniques. We propose to simplify this challenging atom-source preparation by employing magic laser wavelengths for the optical lensing potentials, which guarantee that all atomic species follow identical trajectories and experience common expansion dynamics. In this way, the relative shape of the mixture is conserved during the entire evolution while cutting in half the number of required lensing pulses compared to standard approaches.
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17

Song, Taeyoung, Jun Young Cheong, Hyunjin Cho, Il-Doo Kim et Duk Young Jeon. « Mixture of quantum dots and ZnS nanoparticles as emissive layer for improved quantum dots light emitting diodes ». RSC Advances 9, no 27 (2019) : 15177–83. http://dx.doi.org/10.1039/c9ra01462d.

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18

Kasper, Valentin, Daniel González-Cuadra, Apoorva Hegde, Andy Xia, Alexandre Dauphin, Felix Huber, Eberhard Tiemann, Maciej Lewenstein, Fred Jendrzejewski et Philipp Hauke. « Universal quantum computation and quantum error correction with ultracold atomic mixtures ». Quantum Science and Technology 7, no 1 (11 novembre 2021) : 015008. http://dx.doi.org/10.1088/2058-9565/ac2d39.

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Abstract Quantum information platforms made great progress in the control of many-body entanglement and the implementation of quantum error correction, but it remains a challenge to realize both in the same setup. Here, we propose a mixture of two ultracold atomic species as a platform for universal quantum computation with long-range entangling gates, while providing a natural candidate for quantum error-correction. In this proposed setup, one atomic species realizes localized collective spins of tunable length, which form the fundamental unit of information. The second atomic species yields phononic excitations, which are used to entangle collective spins. Finally, we discuss a finite-dimensional version of the Gottesman–Kitaev–Preskill code to protect quantum information encoded in the collective spins, opening up the possibility to universal fault-tolerant quantum computation in ultracold atom systems.
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19

Jakuš, Vladimír, Eva Matisová et Stanislav Miertuš. « Application of Quantum Chemical Calculations to the Identification of Positional Isomers of Polysubstituted Alkylbenzenes ». Collection of Czechoslovak Chemical Communications 57, no 12 (1992) : 2494–500. http://dx.doi.org/10.1135/cccc19922494.

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The problem of assignment of positional isomers of alkylbenzenes to chromatographic peaks is addressed. Probable structures are attributed based on the correlation of stabilities of the isomers, which are expressed as the total molecular energies calculated by the MINDO/3 semiempirical quantum chemical method, and the proportions of the isomers in the reaction mixture. Multicomponent alkylbenzene mixtures were prepared and separated by capillary gas chromatography, and the identity of the isomers was confirmed by the gas chromatography-mass spectrometry combination.
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20

Viana Ramos *, Rubens. « Mixture of two-mode unpolarized and pure quantum light states : quantum polarization and application in quantum communication ». Journal of Modern Optics 52, no 15 (15 octobre 2005) : 2093–103. http://dx.doi.org/10.1080/09500340500147208.

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21

BERTINI, CESARINO, et ROBERTO LEPORINI. « QUANTUM COMPUTATIONAL FINITE-VALUED LOGICS ». International Journal of Quantum Information 05, no 05 (octobre 2007) : 641–65. http://dx.doi.org/10.1142/s0219749907003109.

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The theory of logical gates in quantum computation has suggested new forms of quantum logic, called quantum computational logics. The basic semantic idea is the following: the meaning of a sentence is identified with a quantum information quantity, represented by a quregister (a system of qudits) or, more generally, by a mixture of quregisters (called qumix), whose dimension depends on the logical complexity of the sentence. At the same time, the logical connectives are interpreted as logical operations defined in terms of quantum logical gates. Physical models of quantum computational logics can be built by means of Mach-Zehnder interferometers.
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22

Zhang, Lin, Yixin Jiang et Junde Wu. « Duistermaat–Heckman measure and the mixture of quantum states ». Journal of Physics A : Mathematical and Theoretical 52, no 49 (13 novembre 2019) : 495203. http://dx.doi.org/10.1088/1751-8121/ab5297.

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23

Wang, Jing-Bo, Jian-Song Pan, Xiaoling Cui et Wei Yi. « Quantum Droplets in a Mixture of Bose–Fermi Superfluids ». Chinese Physics Letters 37, no 7 (juillet 2020) : 076701. http://dx.doi.org/10.1088/0256-307x/37/7/076701.

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24

Tanaka, K., et K. Tsuda. « A quantum-statistical-mechanical extension of Gaussian mixture model ». Journal of Physics : Conference Series 95 (1 janvier 2008) : 012023. http://dx.doi.org/10.1088/1742-6596/95/1/012023.

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25

Laikhtman, B. « Direct and indirect exciton mixture in double quantum wells ». EPL (Europhysics Letters) 123, no 6 (22 octobre 2018) : 67001. http://dx.doi.org/10.1209/0295-5075/123/67001.

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26

Fukuhara, T., T. Tsujimoto et Y. Takahashi. « Quadrupole oscillations in a quantum degenerate Bose–Fermi mixture ». Applied Physics B 96, no 2-3 (13 février 2009) : 271–74. http://dx.doi.org/10.1007/s00340-009-3375-5.

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27

Zhu, Chenyu, Qiao Wang, Guorong Sun, Suo Zhao, Yao Wang, Tonghui Li, Xianglong Hao, Mikhail Artemyev et Jianguo Tang. « High-Luminescence Electrospun Polymeric Microfibers In Situ Embedded with CdSe Quantum Dots with Excellent Environmental Stability for Heat and Humidity Wearable Sensors ». Nanomaterials 12, no 13 (3 juillet 2022) : 2288. http://dx.doi.org/10.3390/nano12132288.

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In this paper, hydrophobic luminescent CdSe quantum dots are successfully dispersed in a mixture of styrene and methyl methacrylate through the oleic to methacrylic acid ligand exchange. Further in situ solution polymerization of the quantum dots in a mixture of styrene and methyl methacrylate followed by electrospinning allowed us to prepare luminescence hybrid styrene-co-methyl methacrylate fibers embedded with quantum dots. CdSe@P(S+MMA) hybrid fibers with 27% quantum yield showed excellent moisture, heat and salt resistance with a photoluminescence output below 120 °C. When dry heated, the hybrid fibers of the fluorescence signals decreased with temperature to 79%, 40%, 28%, 20% and 13% at 120 °C, 140 °C, 160 °C, 180 °C and 200 °C, respectively, due the to the chemical degradation of CdSe QDs. Such hybrid fibers show the potential to manufacture wearable moisture- and heat-sensing protective clothing in a 120–200 °C range due to the thermal-induced quenching of quantum dot photoluminescence.
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28

DALLA CHIARA, MARIA LUISA, ROBERTO GIUNTINI et ROBERTO LEPORINI. « LOGICS FROM QUANTUM COMPUTATION ». International Journal of Quantum Information 03, no 02 (juin 2005) : 293–337. http://dx.doi.org/10.1142/s0219749905000943.

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The theory of logical gates in quantum computation has suggested new forms of quantum logic, called quantum computational logics. The basic semantic idea is the following: the meaning of a sentence is identified with a quregister (a system of qubits) or, more generally, with a mixture of quregisters (called qumix). In this framework, any sentence α of the language gives rise to a quantum tree: a kind of quantum circuit that transforms the quregister (qumix) associated to the atomic subformulas of α into the quregister (qumix) associated to α. A variant of the quantum computational semantics is represented by the quantum holistic semantics, which permits us to represent entangled meanings. Physical models of quantum computational logics can be built by means of Mach–Zehnder interferometers.
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29

Wang, Simeng. « Quantum symmetries on noncommutative complex spheres with partial commutation relations ». Infinite Dimensional Analysis, Quantum Probability and Related Topics 21, no 04 (décembre 2018) : 1850028. http://dx.doi.org/10.1142/s0219025718500285.

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We introduce the notion of noncommutative complex spheres with partial commutation relations for the coordinates. We compute the corresponding quantum symmetry groups of these spheres, and this yields new quantum unitary groups with partial commutation relations. We also discuss some geometric aspects of the quantum orthogonal groups associated with the mixture of classical and free independence discovered by Speicher and Weber. We show that these quantum groups are quantum symmetry groups on some quantum spaces of spherical vectors with partial commutation relations.
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30

ANMA, DAISUKE, KEN-ICHI TAKIUCHI et TADASHI TOYODA. « QUANTUM FIELD THEORETICAL FORMULATION OF EQUATION OF STATE FOR FERMION–BOSON MIXTURES ». International Journal of Modern Physics B 17, no 31n32 (30 décembre 2003) : 5943–49. http://dx.doi.org/10.1142/s0217979203023409.

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Using a quantum field theoretical canonical generator for the scale transformation of the second quantized Schrödinger fields describing a mixture of Fermion and Boson systems, the equation of state is derived. The derivation is based on the equal-time canonical commutation relations of the field operators and no approximation is employed. The result can be applied to liquid 3 He –4 He mixture.
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31

Reichardt, B. W. « Quantum universality by state distillation ». Quantum Information and Computation 9, no 11&12 (novembre 2009) : 1030–52. http://dx.doi.org/10.26421/qic9.11-12-7.

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Quantum universality can be achieved using classically controlled stabilizer operations and repeated preparation of certain ancilla states. Which ancilla states suffice for universality? This ``magic states distillation" question is closely related to quantum fault tolerance. Lower bounds on the noise tolerable on the ancilla help give lower bounds on the tolerable noise rate threshold for fault-tolerant computation. Upper bounds show the limits of threshold upper-bound arguments based on the Gottesman-Knill theorem. We extend the range of single-qubit mixed states that are known to give universality, by using a simple parity-checking operation. For applications to proving threshold lower bounds, certain practical stability characteristics are often required, and we also show a stable distillation procedure.}{No distillation upper bounds are known beyond those given by the Gottesman-Knill theorem. One might ask whether distillation upper bounds reduce to upper bounds for single-qubit ancilla states. For multi-qubit pure states and previously considered two-qubit ancilla states, the answer is yes. However, we exhibit two-qubit mixed states that are not mixtures of stabilizer states, but for which every postselected stabilizer reduction from two qubits to one outputs a mixture of stabilizer states. Distilling such states would require true multi-qubit state distillation methods.
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32

Panasyuk, Yaroslav V., Oleskandra E. Rayevska, Oleksandr L. Stroyuk et Stepan Ya Kuchmiy. « A new mild synthesis and optical properties of colloidal ZnO nanocrystals in dimethylformamide/ethanol solutions ». MRS Proceedings 1617 (2013) : 119–24. http://dx.doi.org/10.1557/opl.2013.1174.

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ABSTRACTA green and mild synthesis of colloidal zinc oxide nanocrystals in ethanol/dimethylformamide mixtures was introduced which allows to produce stable crystalline ZnO particles and tailor their average size in the range of 2.8−4.5 nm by varying temperature and duration of post-synthesis ageing. An increase in dimethylformamide fraction in the mixture results in acceleration of ZnO nanocrystals ripening. Colloidal ZnO nanocrystals emit broadband photoluminescence in the range of 2−3 eV with the quantum yields of up to 12 %.
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33

Mukbaniani, Omar, Tamara Tatrishvili, Zurab Pachulia, Levan Londaridze et Nana Pirtskheliani. « Quantum-Chemical Modeling of Hydrosilylation Reaction of Triethoxysilane to Divinylbenzene ». Chemistry & ; Chemical Technology 16, no 4 (22 décembre 2022) : 499–506. http://dx.doi.org/10.23939/chcht16.04.499.

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Hydrosilylation of triethoxysilane with the mixture of ortho- and para-divinylbenzene in the presen¬ce of Karstedt’s catalyst has been carried out and the corresponding product triethoxy(vinylphenethyl)silane have been obtained. The structure and composition of the obtained product were proved by means of determining molecular mass, molecular refraction, and 1H and 13C NMR spectra data. It was found that the addition reaction proceeds both in ortho-position as well as in para-position. Hydrosilylation proceeds both Markovnikov and anti-Markovnikov rule. Via quantum-chemical calculations using the non-empirical density functional theory (DFT) method, the possible direction of the reaction has been considered.
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34

Journal, Baghdad Science. « Study the spectroscopic characteristics of Rhodamine B Dye in Ethanol and Methanol mixture and Calculation the Quantum Efficiency ». Baghdad Science Journal 9, no 2 (3 juin 2012) : 352–58. http://dx.doi.org/10.21123/bsj.9.2.352-358.

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The effect of ethanol and methanol solvent, and their mixture has been studied on the absorption and fluorescence spectra of laser dye Rhodamine B at concentration of (10-4) Molar at room temperature. The molar absorption coefficient has been determined for mixture which was (3.223) at wave number (18181.8 cm-1), Also the Quantum Efficiency of the two solvents (ethanol and methanol) and their mixture have been calculated ,which was for mixture spectrum (38.94%) and it was larger comparing with other and solvents. The characteristics of spectrum has been determined by calculating (??) of absorption spectrum for the solvents and its mixture at maximum wave number ( ) cm-1 depending on solvent polarity and the transitions between molecular energy levels in each solvent of Rhodamine B dye .
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35

Ferlaino, F., R. J. Brecha, P. Hannaford, F. Riboli, G. Roati, G. Modugno et M. Inguscio. « Dipolar oscillations in a quantum degenerate Fermi Bose atomic mixture ». Journal of Optics B : Quantum and Semiclassical Optics 5, no 2 (1 avril 2003) : S3—S8. http://dx.doi.org/10.1088/1464-4266/5/2/351.

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36

Cabrera, C. R., L. Tanzi, J. Sanz, B. Naylor, P. Thomas, P. Cheiney et L. Tarruell. « Quantum liquid droplets in a mixture of Bose-Einstein condensates ». Science 359, no 6373 (14 décembre 2017) : 301–4. http://dx.doi.org/10.1126/science.aao5686.

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37

Tripathi, Neeti, Masanori Ando, Tomoko Akai et Kenji Kamada. « Near-infrared-to-visible upconversion from 980 nm excitation band by binary solid of PbS quantum dot with directly attached emitter ». Journal of Materials Chemistry C 10, no 12 (2022) : 4563–67. http://dx.doi.org/10.1039/d1tc05058c.

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Jiang, Yuan, Shuhong Xu, Zengxia Zhao, Liang Zheng, Zhuyuan Wang, Chunlei Wang et Yiping Cui. « Water–ethanol solvent mixtures : a promising liquid environment for high quality positively-charged CdTe nanocrystal preparation ». RSC Adv. 5, no 24 (2015) : 18379–83. http://dx.doi.org/10.1039/c4ra14134b.

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39

Fort, Chiara, et Michele Modugno. « Self-Evaporation Dynamics of Quantum Droplets in a 41K-87Rb Mixture ». Applied Sciences 11, no 2 (19 janvier 2021) : 866. http://dx.doi.org/10.3390/app11020866.

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We theoretically investigate the self-evaporation dynamics of quantum droplets in a 41K-87Rb mixture, in free-space. The dynamical formation of the droplet and the effects related to the presence of three-body losses are analyzed by means of numerical simulations. We identify a regime of parameters allowing for the observation of the droplet self-evaporation in a feasible experimental setup.
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40

Deodanes, O., J. C. Molina, C. Violantes, D. Pleitez, J. Cuadra, H. Ponce et C. Rudamas. « White Light Emitting CdS Quantum Dot Devices Coated with Layers of Graphene Carbon Quantum Dots ». MRS Advances 5, no 63 (2020) : 3337–43. http://dx.doi.org/10.1557/adv.2020.436.

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AbstractCadmium sulfide quantum dots (CdS QDs) are semiconductor nanoparticles having sizes in the order of nanometers. They are materials that have outstanding properties for down conversion applications. These nanostructures have been used in the fabrication of white light emitting diodes (WLEDs) in the last years. However, inhomogeneous deposition of CdS QD conversion materials allows unwanted UV light escape. In addition, low efficiency due to strong self-quenching effect, incompatibility between CdS QD solution/crystal polyester resin matrix and reabsorption are common problems that need to be solved. In this work, we try to address the incompatibility between the CdS QD solution/crystal polyester resin matrix by using a solvent exchange procedure. To block the unwanted UV-light escape, we coated our devices with a mixture of graphene carbon quantum dot (GCQD) solution/crystal polyester resin matrix. The QDs and the WLED prototypes were characterized by absorption and photoluminescence (PL) spectroscopy. The QDs embedded in the matrix shown a good homogeneous dispersion. On the other hand, the mixture shown a rapid solidification. These facts indicate a good compatibility between the CdS QDs and the crystal polyester resin. We also observed a considerable reduction of unwanted near UV-light. White light emission from WLED devices with common crystal polyester resin and low-cost materials has been achieved.
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41

Chiang, Ya-Han, Kuan-Yu Lin, Yu-Hsuan Chen, Keiko Waki, Mulu Alemayehu Abate, Jyh-Chiang Jiang et Jia-Yaw Chang. « Aqueous solution-processed off-stoichiometric Cu–In–S QDs and their application in quantum dot-sensitized solar cells ». Journal of Materials Chemistry A 6, no 20 (2018) : 9629–41. http://dx.doi.org/10.1039/c8ta01064a.

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Off-stoichiometric CuInS2 quantum dots (CuInS2, a mixture of In2S3/CuInS2, and a Mn-doped mixture of In2S3/CuInS2) were prepared in a one-pot reaction, and the corresponding sensitized solar cells exhibit promising photovoltaic performances.
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42

Pai, Asha R., B. Silpa Sasi, J. Arya et K. S. Arjun. « Synthesis of Graphene Quantum dots from the fresh leaves extract of Cynodon Dactylon and its Photoluminescence studies ». IOP Conference Series : Materials Science and Engineering 1219, no 1 (1 janvier 2022) : 012005. http://dx.doi.org/10.1088/1757-899x/1219/1/012005.

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Abstract The current research is mainly focused on the synthesis of graphene quantum dots from the fresh extracts of Dhruva Grass (Cynodon Dactylon) by a One-pot, facile, solvothermal method at 60°C for 1 hr using a solvent mixture of Methanol and acetone in a ratio of 1:1. The high resolution transmission electron microscope image showed the formation of Graphene quantum dots with average size of 3-5 nm with the fluorescent quantum yield of 49.1%.
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43

Burchianti, Alessia, Chiara D’Errico, Marco Prevedelli, Luca Salasnich, Francesco Ancilotto, Michele Modugno, Francesco Minardi et Chiara Fort. « A Dual-Species Bose-Einstein Condensate with Attractive Interspecies Interactions ». Condensed Matter 5, no 1 (21 mars 2020) : 21. http://dx.doi.org/10.3390/condmat5010021.

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We report on the production of a 41 K- 87 Rb dual-species Bose–Einstein condensate with tunable interspecies interaction and we study the mixture in the attractive regime; i.e., for negative values of the interspecies scattering length a 12 . The binary condensate is prepared in the ground state and confined in a pure optical trap. We exploit Feshbach resonances for tuning the value of a 12 . After compensating the gravitational sag between the two species with a magnetic field gradient, we drive the mixture into the attractive regime. We let the system evolve both in free space and in an optical waveguide. In both geometries, for strong attractive interactions, we observe the formation of self-bound states, recognizable as quantum droplets. Our findings prove that robust, long-lived droplet states can be realized in attractive two-species mixtures, despite the two atomic components possibly experiencing different potentials.
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44

LaRose, Ryan, Andrea Mari, Sarah Kaiser, Peter J. Karalekas, Andre A. Alves, Piotr Czarnik, Mohamed El Mandouh et al. « Mitiq : A software package for error mitigation on noisy quantum computers ». Quantum 6 (11 août 2022) : 774. http://dx.doi.org/10.22331/q-2022-08-11-774.

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We introduce Mitiq, a Python package for error mitigation on noisy quantum computers. Error mitigation techniques can reduce the impact of noise on near-term quantum computers with minimal overhead in quantum resources by relying on a mixture of quantum sampling and classical post-processing techniques. Mitiq is an extensible toolkit of different error mitigation methods, including zero-noise extrapolation, probabilistic error cancellation, and Clifford data regression. The library is designed to be compatible with generic backends and interfaces with different quantum software frameworks. We describe Mitiq using code snippets to demonstrate usage and discuss features and contribution guidelines. We present several examples demonstrating error mitigation on IBM and Rigetti superconducting quantum processors as well as on noisy simulators.
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45

Zhang, Yu-Feng, Rong-Yi Huang, Jun-Wei Wang et Xue-Jun Kong. « Composition-dependent association behavior in the mixture of isopropanol and trichloromethane : a volumetric, vibration spectroscopic and quantum chemical study ». RSC Advances 5, no 78 (2015) : 63719–25. http://dx.doi.org/10.1039/c5ra09071g.

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Herein the intermolecular associative behaviors in the binary mixture of isopropanol and trichloromethane have been studied via a combined excess volumetric, vibration spectroscopic and quantum chemical approach.
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46

Petrescu, Emil, Cristina Cirtoaje et Octavian Danila. « Dynamic behavior of nematic liquid crystal mixtures with quantum dots in electric fields ». Beilstein Journal of Nanotechnology 9 (1 février 2018) : 399–406. http://dx.doi.org/10.3762/bjnano.9.39.

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The dynamic behavior of a mixture consisting of liquid crystalline 4-cyano-4’-pentylbiphenyl (5CB) and CdSe/ZnS quantum dots in electric fields was theoretically studied. The model was based on elastic continuum theory considering the interaction of the nematic molecules with the surrounding molecules, with the quantum dots and with the electric field. Experimental data obtained by dynamic measurements on a sample containing 0.89% (mass fraction) of CdSe/ZnS quantum dots revealed a decrease of the relaxation time compared to pure 5CB.
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47

WANG, J. N., C. L. YANG, S. H. WANG, L. GUO, S. H. YANG, I. K. SOU et W. K. GE. « CHARACTERIZATION OF SEMICONDUCTOR QUANTUM DOTS ». International Journal of Modern Physics B 16, no 28n29 (20 novembre 2002) : 4363–72. http://dx.doi.org/10.1142/s0217979202015443.

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The applications of various optical and electrical characterization techniques to the study of semiconductor quantum dots (QDs) are summarized. Photoconductivity enhancement effect in CdS-PVK nanocomposite is studied by optical absorption, photoluminescence (PL), photoconductivity spectroscopy, and time-resolved PL. It is found that the photoconductivity of the composite is greatly enhanced in comparison with that of a simple mixture of CdS nano-particles and PVK. PL spectra have shown that luminescence from PVK is dramatically quenched by the incorporation of a low density of CdS particles. Time-resolved spectra reveal that the decay of the PL from the dots of the composite in much longer than that in the simple mixture. These have been attributed to a fast carrier transfer mechanism between CdS QDs and PVK matrix. In addition, optical properties of PVP-capped ZnO QDs are investigated in details. Typical PL spectra of PVP-capped ZnO QDs consist of a sharp UV peak located at about 3.45 eV and a broad green emission band centered at 2.34 eV. At certain Zn 2+/ PVP ratios the green emission band is quenched and only strong UV emission remains. This effect is attributed to the surface modification of ZnO quantum dots with PVP. We are able to associate the UV emission from ZnO QDs to localized states by applying temperature and excitation power dependent PL. Finally, the electronic level of molecular beam epitaxy grown self-organized ZnSe QDs embedded in ZnS is determined by applying PL, capacitance-voltage measurement, and deep level transient spectroscopy.
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48

Sanchooli, Mahmood. « Evaluation of Acidity Constants and Evolution of Electronic Features of Phenol Derivatives in Different Compositions of Methanol/Water Mixture ». Journal of Chemistry 2013 (2013) : 1–8. http://dx.doi.org/10.1155/2013/989362.

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This work was devoted to evaluation of acidity constants of 28 phenol derivatives in 11 different compositions of methanol/water solvent mixtures. The Onsager reaction field model was applied to any molecule of phenol derivatives dissolved in binary mixture of methanol/water, and the quantum chemical descriptors of the solute were calculated. Multiple linear regression was used to perform the reliable QSPR models in order to predict the acidity constants of the solutes. It was explored that the solvation of phenol derivatives in solvent of binary mixture of methanol/water shows a different behavior as the composition of methanol varies. Four different mechanisms proposed for solvation in 0–100 volume percent of methanol solvent. It was seen that the dipole-dipole interactions increase as the amount of methanol increases in solvent mixture, which implies the contribution of highly negative oxygens of methanol on hydrogen bondings between solute and solvent cavity. The orbital energies are a major electronic descriptor on solvation processes. This proposes that the charge exchange between frontier orbital energies of anions and the solvent molecules is the major event occurring in solution in order to stabilize the produced anions.
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49

Da̧browska, Anita. « Quantum Filtering Equations for a System Driven by Nonclassical Fields ». Open Systems & ; Information Dynamics 25, no 02 (juin 2018) : 1850007. http://dx.doi.org/10.1142/s1230161218500075.

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Using Gardiner and Collet’s input-output model and the concept of cascade system, we determine the filtering equation for a quantum system driven by light in some specific nonclassical states. The quantum system and electromagnetic field are described by making use of quantum stochastic unitary evolution. We consider two examples of the nonclassical states of field: a combination of vacuum and single photon states and a mixture of two coherent states. The stochastic evolution conditioned on the results of the photon counting and quadrature measurements is described.
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Šebek, Pavel, Petr Sedmera, Stanislav Böhm et Josef Kuthan. « Sigmatropic Isomerization of Tetraphenylcyclopentadienes : Reaction Mechanism and Quantum Chemical Treatment ». Collection of Czechoslovak Chemical Communications 58, no 4 (1993) : 882–92. http://dx.doi.org/10.1135/cccc19930882.

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Thermal isomerization of 2,3,5,5-tetraphenylcyclopenta-1,3-diene (Ia) or 1,2,4,5-tetraphenylcyclopenta-1,3-diene (IIa) in melts lead to identical equilibrium mixtures of hydrocarbon IIa with prevailing 1,2,3,4-tetraphenylcyclopenta-1,3-diene (IIIa). The isomerization of bis-tert-butyl cyclopentadienes Ib or Ic produces an equilibrium mixture with preponderant 1,2,3,4-tetrasubstituted cyclopentadienes IIIb, IIIc besides minority isomers IIb, IIc. On the contrary, the 1,2,4,5-tetrasubstituted phenanthrene hydrocarbon IXa having forced coplanarity of both benzene rings only partially isomerizes to IXb. Equilibrium constants of the isomerization IIa → IIIa in diphenyl ether at 323 to 433 K were measured (K = 5.8 -2.3). Relative stability of hydrocarbons Ia, IIa, IIIa and VIIa is interpreted on the basis of quantum chemical AM1 calculations. The time course of isomerization of the hydrocarbon IIc allowed us to propose two reaction mechanisms based on the [1,3]- and [1,5]-sigmatropic steps. The preparation of 2,3,5,5-tetrasubstituted cyclopentadienes Ia - Ic by dehydration of cis-1,2-diols IVa - IVc is described.
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