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Zeitschriftenartikel zum Thema „POLKON“

Autor: Grafiati

Veröffentlicht am 1. Juli 2021

Zuletzt aktualisiert am 29. Juli 2025

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1

Tee, Chwee Ming. "Political connections, institutional investors monitoring and stock price synchronicity." Managerial Finance 43, no. 11 (2017): 1236–53. http://dx.doi.org/10.1108/mf-03-2017-0099.

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Purpose The purpose of this paper is to examine the association between politically connected (POLCON) firms and stock price synchronicity, and whether this association can be attenuated by institutional investors. Design/methodology/approach This paper uses an ordinary least square regression model to examine the association between POLCON firms and stock price synchronicity; institutional ownership and stock price synchronicity; the moderating role of institutional ownership on the association between POLCON firms and stock price synchronicity; institutional domiciles and stock price synchro

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Tee, Chwee Ming, Angelina Seow Voon Yee, and Aik Lee Chong. "Institutional Investors’ Monitoring and Stock Price Crash Risk: Evidence from Politically Connected Firms." Review of Pacific Basin Financial Markets and Policies 21, no. 04 (2018): 1850028. http://dx.doi.org/10.1142/s0219091518500285.

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Motivated by recent studies on political connections and stock price crash risk, this study investigates whether there is an association between politically connected (POLCON) firms and stock price crash risk. Further, we examine whether institutional investors’ ownership can moderate this association. Using a dataset of Malaysian firms for the period 2002–2012, we show that POLCON firms are associated with higher risk of stock price crashes. However, the positive association between POLCON and stock crashes is attenuated by higher institutional ownership, implying effective monitoring. Finall

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Keel, K. R., C. H. Gilliam, G. R. Wehtje, T. L. Grey, G. J. Keever, and D. J. Eakes. "EVALUATION OF HERBICIDE ABSORPTION AND RELEASE PROPERTIES OF FIVE HERBICIDE-COATED FERTILIZERS." HortScience 31, no. 5 (1996): 744f—745. http://dx.doi.org/10.21273/hortsci.31.5.744f.

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Several experiments were conducted to determine release rates of five oxadiazon-coated fertilizers. Five fertilizers and 4-mm glass beads (nonabsorbent control) were coated with 14C-oxadiazon + formulated oxadiazon, then placed in a separatory funnel and leached with 20 ml of water for 14 days. 14C-oxadiazon was quantified by use of liquid scintillation spectrometry. For glass beads, Nutricote, Meister, and Osmocote, 70% to 80% of the 14C-oxadiazon was recovered in the first two leaching events. Oxadiazon leached from Polyon was 47% during the first two events and remaining oxadiazon was slowl

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Terin, D. V., M. M. Kardash, T. A. Turaev, and D. V. Ainetdinov. "Low-Temperature Ion-Plasma Pretreatment of Fibrous Systems during the Creation of Composite Heterogeneous Membranes." Мембраны и мембранные технологии 13, no. 4 (2023): 291–300. http://dx.doi.org/10.31857/s2218117223040065.

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In this paper, the objects of study are heterogeneous cation-exchange materials Polykon, obtained on a fibrous system that has undergone preliminary preparation by low-temperature high-frequency argon plasma at power of 400 W for 10 min at a pressure of 5 × 10–5 mbar. As a fibrous system, a fabric made of novolac phenol-formaldehyde fibers—Kynol was used. The surface of the fibrous system before and after plasma treatment using scanning electron microscopy was studied. The hydrophilic/hydrophobic balance was examined on the surface of a fabric made of phenol-formaldehyde novolac fibers—Kynol (

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Derby, Scott A., and L. Eric Hinesley. "Fertilizing Containerized Atlantic White Cedar Seedlings." Journal of Environmental Horticulture 23, no. 2 (2005): 97–100. http://dx.doi.org/10.24266/0738-2898-23.2.97.

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Abstract Containerized Atlantic white cedar [Chamaecyparis thyoides (L.) B.S.P.] seedlings were fertilized with five rates (0.0, 2.4, 4.8, 7.2, and 9.6 kg/m3) (0, 4, 8, 12, and 16 lb/yd3) of controlled-release fertilizers (CRF) [Osmocote 15N–4.0P–10.0K (15N–9P2O5–12K2O), 12–14 month southern formulation, with micros; and Polyon 18N–2.6P–10.0K (18N–6P2O5–12K2O), 9-month formulation, with micros]. Height, stem diameter, dry mass, and foliar nutrient concentrations were evaluated after 16 weeks. Growth was affected by fertilizer source and application rate, with no interaction. In general, the re

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6

Eswaran, Sumathy. "Marvin P Polson." International Journal of Computer Applications 41, no. 9 (2012): 18–22. http://dx.doi.org/10.5120/5569-7660.

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Gramatyka, Jakub, Przemysław Paszkiewicz, Damian Grabowski, et al. "Development of POLON—A Green Microsatellite Propulsion Module Utilizing 98% Hydrogen Peroxide." Aerospace 9, no. 6 (2022): 297. http://dx.doi.org/10.3390/aerospace9060297.

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The following paper presents the key design and test activities associated with the development of POLON—a green microsatellite propulsion module using 98% Hydrogen Peroxide (HTP). POLON, which stands for “Polish Propulsion Module”, is the first step toward the development of a full, ready-to-be-commercialized satellite propulsion system at the Łukasiewicz—Institute of Aviation (Ł-IoA). The development of an entire microsatellite propulsion system within the frame of the POLON project effort is the natural milestone on the Ł-IoA green propulsion roadmap, which so far embodied research on funda

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Liu, Hanzhe, and Scott Cushing. "Observation of Electronic and Structural Interaction between Small Polaron and Host Material Using Femtosecond XUV Reflection Spectroscopy." ECS Meeting Abstracts MA2023-01, no. 37 (2023): 2171. http://dx.doi.org/10.1149/ma2023-01372171mtgabs.

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Small polaron formation in transition metal oxides is believed to be a reaction bottleneck in many solar energy conversion applications. While polaron formation has been previously confirmed, the microscopic interaction between a small polaron and its host material is largely unexplored. Here, using femtosecond XUV reflection spectroscopy, we report the evidence of electronic and structural interaction between the small polaron and its host material in CuFeO2, a photoelectrode material for CO2 reduction. Initial small polaron formation is observed as a spectral blue shift occurring within the

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Husby, Chad E., Alex X. Niemiera, Robert D. Wright, and J. Roger Harris. "369 Influence of Temperature and Product on Nutrient Release Patterns of Three Polymer-coated Fertilizers." HortScience 35, no. 3 (2000): 456A—456. http://dx.doi.org/10.21273/hortsci.35.3.456a.

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Use of polymer-coated fertilizers (PCFs) is widespread in the nursery and greenhouse industries. Temperature is the main factor affecting nutrient release from PCFs, yet there are few reports that quantify temperature-induced nutrient release. Since container substrate temperatures can be at least 40 °C during the summer, this research quantified the release of fertilizer salts in the diurnal container substrate temperature range of 20 to 40 °C. Three PCFs (Osmocote Plus 15-9-11, Polyon 18-6-12, and Nutricote18-6-8) were placed in water-filled beakers at 40 °C until one-third (Expt.1) or two-t

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Korshunova, A. N., and V. D. Lakhno. "Transition from a Uniform Mode of Polaron Motion to an Oscillatory One When the Initial Polaron State Changes." Mathematical Biology and Bioinformatics 18, no. 2 (2023): 446–63. http://dx.doi.org/10.17537/2023.18.446.

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A study of the nature of the motion of a Holstein polaron in a homogeneous polynucleotide chain in a constant electric field, depending on the initial polaron state, was carried out. The calculations performed showed that the duration of the uniform motion of the polaron along the chain is finite and depends on the entire set of system parameters, including the characteristic size of the initial polaron state. It is shown that at a fixed value of the electric field intensity, an increase in the characteristic size of the initial polaron state leads to a decrease in the time of uniform motion o

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MALOZOVSKY, Y. M., J. D. FAN, D. BAGAYOKO, and J. T. WANG. "POLARONIC EFFECT IN MATERIALS WITH FERROELECTRIC PHASE TRANSITIONS." International Journal of Modern Physics B 13, no. 29n31 (1999): 3555–59. http://dx.doi.org/10.1142/s0217979299003416.

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We studied polaron effects due to the interaction of an electron with optical phonons in ferroelectrics with a layered crystal structure. We evaluated the polaron self-energy using the effective T-matrix. We showed that transition from the large radius polaron to the small radius polaron is controlled by the interlayer interaction or interlayer spacing. We also found that the polaron interaction with the fluctuations of polarizability near the Curie temperature causes polaron localization.

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Korshunova, Alevtina Nikolaevna, and Victor Dmitrievich Lakhno. "Transition from a uniform mode of polaron motion to an oscillatory one when the initial polaron state changes." Keldysh Institute Preprints, no. 53 (2023): 1–26. http://dx.doi.org/10.20948/prepr-2023-53.

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A study of the nature of the motion of a Holstein polaron in a homogeneous polynucleotide chain in a constant electric field, depending on the initial polaron state, was carried out. The calculations performed showed that the duration of the uniform motion of the polaron along the chain is finite and depends on the entire set of system parameters, including the characteristic size of the initial polaron state. It is shown that at a fixed value of the electric field intensity, an increase in the characteristic size of the initial polaron state leads to a decrease in the time of uniform motion o

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Fialko, N. S., and V. D. Lakhno. "Numerical Simulation of Small Radius Polaron in a Chain with Random Perturbations." Mathematical Biology and Bioinformatics 14, no. 2 (2019): 406–19. http://dx.doi.org/10.17537/2019.14.406.

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We consider the dynamics of polaron in a chain using computational experiment. The temperature, which is simulated by random Langevin-type perturbations, and influence of external electric field are taking into account. In a sufficiently long unperturbed chain, the displacement of the center of mass of the polaron and its velocity does not depend on its length. In the semiclassical Holstein model, which is applied for simulations of charge transfer in DNA, the region of polaron existence in the thermodynamic equilibrium state depends not only on temperature, but also on the chain length. There

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Żurawik, Piotr, and Monika Placek. "The influence of fertilization on quality of inflorescences of easy pot freesia (Freesia Eckl. ex Klatt) grown from adventitious corms." Acta Agrobotanica 64, no. 3 (2012): 59–66. http://dx.doi.org/10.5586/aa.2011.032.

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The experiments were carried out in 2006-2007, in the spring-summer season, in an unheated plastic tunnel. Adventitious corms of Easy Pot Freesia: 'Gompey', 'Popey' and 'Suzy', were the plant material. The influence of a traditional fertilizer Azofoska and slow-release fertilizers, Osmocote Plus 5/6, Osmocote Exact and Polyon 5/6, on the ornamental value of plants was evaluated. All fertilizers were applied at rates of 2.5 and 5.0 g × dm<sup>-3</sup>. Freesias cultivated without fertilizer were the control plants. The cultivar 'Gompey' was characterized by longer inflorescence shoo

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Astakhova, T. Yu, and G. A. Vinogradov. "Polarons on Dimerized Lattice of Polyacetilene. Continuum Approximation." Mathematical Biology and Bioinformatics 16, no. 2 (2021): 335–48. http://dx.doi.org/10.17537/2021.16.335.

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A one-electron model is proposed to describe a polaron on a dimerized polyacetylene lattice. Within the framework of the formulated model, the dynamics of a freely moving polaron is considered. The results obtained are compared with the many-electron model that takes into account all π-electrons of the valence band. Polaron can move at subsonic and supersonic speeds. The subsonic polaron is stable. A supersonic polaron loses stability at times ∼ 6 000 fs. A supersonic polaron has a forbidden speed range. An analytical solution to the continual approximation helps to understand the reason for t

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Czocher, Anna. "Files of the Polish Welfare Committee Kraków–Miasto as a source for studying women’s history in 1939–1945." Folia Historica Cracoviensia 29, no. 1 (2023): 25–47. http://dx.doi.org/10.15633/fhc.29102.

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Files of the Polish Welfare Committee Kraków–Miasto (Polish name: Polski Komitet Opiekuńczy Kraków-Miasto, acronym PolKO) are stored in the National Archives in Kraków and have been open to research for years. These files are a highly valuable source for researching the reality of life under occupation, and one of the archival collection whose potential is not being fully exploited by researchers. The purpose of this review is therefore an attempt to show the potential that the PolKO files contribute to the study of women’s history and its interdisciplinary potential. The Polish Welfare Commit

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Keel, Kevin R., Charles H. Gilliam, Glenn R. Wehtje, Tim L. Grey, Gary J. Keever, and Donald J. Eakes. "Herbicide Adsorption and Release Properties of Five Oxadiazon-Coated Fertilizers." Journal of Environmental Horticulture 16, no. 4 (1998): 230–34. http://dx.doi.org/10.24266/0738-2898-16.4.230.

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Abstract Laboratory experiments were conducted to determine the release of oxadiazon coated on control-release fertilizers. Five fertilizers and glass beads (nonabsorbent control) were coated with 14C-oxadiazon + formulated oxadiazon at a herbicide-to-fertilizer concentration of 0.3 mg ai/g. Coated fertilizers were subjected to 14 consecutive daily water leaching events. For the control-release fertilizers, Nutricote, Meister and Osmocote, 70%–80% of the coated oxadiazon was released in the first 3 leaching events; each leaching event after the 7th leaching event contained less than 1% of tota

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Terin, Denis, Marina Kardash, Sergey Korchagin, Sergey Tsyplyayev, Vladimir Cherkasov, and Tamara Druzhinina. "Features of Thermomechanical Stability of Anionic–Cation Exchange Matrix “Polikon AC” on Viscose Non-Woven Materials." Membranes 11, no. 10 (2021): 734. http://dx.doi.org/10.3390/membranes11100734.

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The thermomechanical stability of the anion–cation exchange matrix “Polikon AC” on viscose nonwoven materials is investigated. In this work, a molecular model of a solvation environment for experimentally obtained “Polikon AC” mosaic membranes is refined. Mosaic membranes on a viscose fiber base were fabricated by the method of polycondensation filling. The temperature dependence of deformation was investigated for dry and wet anion and cation exchange membrane components at a constant tensile load of 1.5 N and a heating rate of 8 °C/min. The effect of moisture content on the deformation of an

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Kim, Ye-Jin, Jocelyn Mendes, Jonathan Michelsen, et al. "Coherent Charge Hopping Suppresses Photoexcited Polarons in ErFeO₃." ECS Meeting Abstracts MA2024-01, no. 35 (2024): 1904. http://dx.doi.org/10.1149/ma2024-01351904mtgabs.

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We measure how coherent charge hopping competes with and slows small polaron formation. The coupling of photoexcited charge carriers with phonons in the crystal lattice that results in polaron formation causes carrier localization and limits transport to site-to-site hopping. ErFeO3, a rare-earth orthoferrite, is designed where the large rare earth atom frustrates the FeO6 octahedra, reducing the energetic favorability of polaron formation. We compare transient extreme ultraviolet (XUV) measurements with ab initio theory and transport measurements to quantify the polaron formation rate and mob

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Lykah, V. A. "Mobility of ferroelectric microdomain polaron and conductivity of HTS compounds." Low Temperature Physics 22, no. 6 (1996): 500–502. https://doi.org/10.1063/10.0034032.

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Anisotropy and discreetness of a polaron and lattice excitation are analyzed as possible reasons behind operation of different mechanisms of polaron motion along various axes of the crystal. Temperature dependences of polaron mobility, effective mass, and electrical conductivity of HTS materials are considered. Polaron model as a hole inside a ferroelectric domain having a variable size and consisting of several dipoles in chain oxygen is discussed.

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Korshunova, Alevtina Nikolaevna, and Victor Dmitrievich Lakhno. "Low-density components of a Holstein polaron during its uniform motion in a constant electric field in the initial period of time." Keldysh Institute Preprints, no. 78 (2022): 1–19. http://dx.doi.org/10.20948/prepr-2022-78.

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In this paper, we consider the formation of low-density components of a polaron during its uniform motion in a polynucleotide chain subjected to a constant electric field. The calculations performed show that Bloch oscillations, usually observed during the oscillatory regime of polaron motion along the chain, do not completely disappear when the polaron motion along the chain becomes uniform. It is shown that after the electric field is turned on, the low-density components of the polaron, which have their own internal dynamics, are formed. And despite the fact that the macro-part of the polar

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Newman, Julie P., Joseph P. Albano, Donald J. Merhaut, and Eugene K. Blythe. "Nutrient Release from Controlled-release Fertilizers in a Neutral-pH Substrate in an Outdoor Environment: I. Leachate Electrical Conductivity, pH, and Nitrogen, Phosphorus, and Potassium Concentrations." HortScience 41, no. 7 (2006): 1674–82. http://dx.doi.org/10.21273/hortsci.41.7.1674.

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Release characteristics of four different polymer-coated fertilizers (Multicote, Nutricote, Osmocote, and Polyon) were studied over a 47-week period in a simulated outdoor, containerized plant production system. The 2.4-L containers, filled with high-fertility, neutral-pH substrate, were placed on benches outdoors to simulate the environmental conditions often used for sun-tolerant, woody perennials grown in the southwestern United States. Container leachates were collected weekly and monitored for electrical conductivity, pH, and concentrations of NH4+N, NO3–N, total P, and total K. Concentra

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Bafti, Arijeta, Shiro Kubuki, Hüseyin Ertap, et al. "Electrical Transport in Iron Phosphate-Based Glass-(Ceramics): Insights into the Role of B2O3 and HfO2 from Model-Free Scaling Procedures." Nanomaterials 12, no. 4 (2022): 639. http://dx.doi.org/10.3390/nano12040639.

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In this work, we report the effect of the addition of modifiers and network formers on the polaronic transport in iron phosphate glasses (IPG) in two systems of HfO2–B2O3–Fe2O3–P2O5, to which up to 8 mol% boron and hafnium are added. The addition of oxides significantly changes the Fe2+/Fetotal ratio, thus directly affecting the polaron number density and consequently controlling DC conductivity trends for both series studied by impedance spectroscopy. Moreover, we found that short-range polaron dynamics are also under the influence of structural changes. Therefore, we have studied them in det

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Susanti, Ita, Sumiyati Sumiyati, and Rachmad Imbang Tritjahjono. "TINJAUAN PEMETAAN RISIKO PADA PERGURUAN TINGGI NEGERI SATUAN KERJA BERDASARKAN PP NO 60 TAHUN 2008 TENTANG SISTEM PENGENDALIAN INTERN PEMERINTAH (STUDI KASUS DI POLITEKNIK NEGERI BANDUNG)." Sebatik 24, no. 2 (2020): 327–34. http://dx.doi.org/10.46984/sebatik.v24i2.1138.

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Berdasarkan Pasal 13 ayat (1) PP No. 60 Tahun 2008 tentang SPIP, Pimpinan Instansi Pemerintah wajib melakukan penilaian risiko. Penilaian risiko dilakukan melalui manajemen risiko. Penelitian ini dilakukan di Polban karena Polban sebagai institusi pemerintah yang melaksanakan Tri Dharma Perguruan Tinggi Negeri belum menyusun peta risiko sebagai bagian dari SPIP. Metode yang digunakan adalah pendekatan kualitatif dengan jenis penelitian deskriptif. Penelitian dilakukan dalam tiga tahap. Tahap pertama, studi literatur sebagai studi pendahuluan, yaitu mempelajari peta risiko yang dilakukan oleh i

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Zuhrah, Dalilah Aliyah. "Pengaruh Profesionalisme Pustakawan terhadap Layanan Perpustakaan Politeknik Negeri Bandung." Ilmu Informasi Perpustakaan dan Kearsipan 9, no. 2 (2021): 1. http://dx.doi.org/10.24036/113162-0934.

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Penelitian ini bertujuan untuk mengetahui bagaimana pengaruh profesionalisme pustakawan terhadap layanan yang disediakan oleh perpustakaan POLBAN. Metode penelitian yang digunakan adalah metode kuantitatif berupa survey research dengan analisis korelatif. Sampel dalam penelitian ini adalah 30 mahasiswa POLBAN. Hasil penelitian menunjukkan bahwa profesionalisme pustakawan perpustakaan POLBAN sangat baik. Kemudian, layanan yang disediakan oleh perpustakaan POLBAN pun sangat baik. Pada Uji Korelasi Perason, nilai signifikansi yang diperoleh adalah 0,000 > 0,05 yang menunjukkan bahwa profesiona

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Hakonen, Tuomas. "Kosteuden vaikutus energiapuun polton kannattavuuteen." Suomen Maataloustieteellisen Seuran Tiedote, no. 28 (January 31, 2012): 1–6. http://dx.doi.org/10.33354/smst.75442.

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Maatilat ovat merkittäviä hakkeen käyttäjiä, joten energiapuun polton taloudellisuus on niille erityisen tärkeää. Kosteus on yksi merkittävimmistä hakkeen käytön kannattavuuteen vaikuttavista tekijöistä. Kosteus vaikuttaa hakkeesta saatavaan energiamäärään sekä tehollisen lämpöarvon että polton hyötysuhteen kautta. Tässä tutkimuksessa selvitettiin laskennallisesti eri kosteusprosentteja omaavien tasakokoisten hake-erien energiasisältöjä. Puun lämpöarvo eri kosteuksissa on selvitetty aiemmalla tutkimuksella varsin kattavasti ja myös polttolaitosten energiasta saama keskimääräinen hinta on tiedo

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BOGOLUBOV, N. N., and A. N. KIREEV. "SURFACE POLARON WITH A BARRIER POTENTIAL: UPPER BOUND TO THE GROUND-STATE ENERGY." International Journal of Modern Physics B 10, no. 04 (1996): 455–70. http://dx.doi.org/10.1142/s0217979296000192.

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A general variational method is proposed for investigating the surface polaron ground state valid for any coupling strength of an electron-surface-optical-phonon interaction and for any height of a barrier potential at the crystal boundary. The ground states of the surface polaron at the infinitely high barrier potential and of the surface polaron without the barrier potential are considered. The properties of the surface polarons are discussed in comparison with the bulk polaron theory.

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Antal, Tamás. "A szárított fodormenta tárolási tapasztalatai." Jelenkori Társadalmi és Gazdasági Folyamatok 18, Különszám (2023): 17–28. http://dx.doi.org/10.14232/jtgf.2023.kulonszam.17-28.

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A frissen betakarított fodormenta leveleket fagyasztva szárítással és ún. kombinált szárítási módszerekkel, azaz infravörös-fagyasztva szárítással és meleg levegős-fagyasztva szárítással dehidráltuk. A szárított anyagokat lezárt polietilén csomagokba helyeztük és 4 hónapig szobahőmérsékleten, polcon és hűtőberendezésben tároltuk. A levelek színvizsgálata és illóolaj-tartalmának analizálása havi rendszerességgel történt. A színvizsgálati eredményekből megállapítottuk, hogy a szobahőmérsékleten megőrzött fodormenta levelek teljes színeltérése magasabb volt, mint a hűtőbe helyezett mintáké. Külön

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Cárdenas-Castillo, Luis Fernando, and Arturo Camacho-Guardian. "Strongly Interacting Bose Polarons in Two-Dimensional Atomic Gases and Quantum Fluids of Polaritons." Atoms 11, no. 1 (2022): 3. http://dx.doi.org/10.3390/atoms11010003.

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Polarons are quasiparticles relevant across many fields in physics: from condensed matter to atomic physics. Here, we study the quasiparticle properties of two-dimensional strongly interacting Bose polarons in atomic Bose–Einstein condensates and polariton gases. Our studies are based on the non-self consistent T-matrix approximation adapted to these physical systems. For the atomic case, we study the spectral and quasiparticle properties of the polaron in the presence of a magnetic Feshbach resonance. We show the presence of two polaron branches: an attractive polaron, a low-lying state that

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Astakhova, T. Yu, and G. A. Vinogradov. "Polaron in Electric Field and Vibrational Spectrum of Polyacetylene." Mathematical Biology and Bioinformatics 14, no. 1 (2019): 150–59. http://dx.doi.org/10.17537/2019.14.150.

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In the present paper, the evolution of a polaron in polyacetylene in electric field is studied in detail. It is shown that the dependence of the polaron velocity on the applied field is determined by the peculiarities of the vibrational spectrum of polyacetylene. The spectrum is calculated numerically using the Hessian, the matrix of the second derivatives of the potential energy of the system. A supersonic polaron moving in an electric field generates coherent vibrations of the optical branch of the spectrum of the polyacetylene. The phase velocity of these oscillations is equal to the polaro

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LI, WEI-PING, JI-WEN YIN, YI-FU YU, and JING-LIN XIAO. "THE INFLUENCE OF ELECTRIC FIELD ON THE GROUND-STATE LIFETIME OF POLARON IN A PARABOLIC QUANTUM DOT." Modern Physics Letters B 25, no. 03 (2011): 203–10. http://dx.doi.org/10.1142/s0217984911025596.

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The ground-state energy of polaron was obtained with strong electron-LO-phonon coupling by using a variational method of the Pekar type in a parabolic quantum dot (QD). Quantum transition occurs in the quantum system due to the electron-phonon interaction and the influence of temperature. That is the polaron transition from the ground-state to the first-excited state after absorbing a LO-phonon and it causes the changing of the polaron lifetime. Numerical calculations are performed and the results illustrate the relations of the ground-state lifetime of the polaron on the ground-state energy o

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GUSEINOV, N. M., O. Z. ALEKPEROV, and S. S. GUSEINOVA. "POLARON IN THE SINGLE-WALLED POLAR NANOTUBE." Modern Physics Letters B 20, no. 27 (2006): 1771–76. http://dx.doi.org/10.1142/s0217984906012006.

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The model of electron gas situated on the two-dimensional continual cylindrical surface is suggested to describe a polaron in the single-walled nanotube made of polar material. The problem on weak-coupling polaron is solved using perturbation theory. Analytical expression for the polaron energy shift of the subband is found in the case of bulk phonon approximation and the case when longitudinal optical (LO) phonons are confined on the cylinder's surface. It is shown that in the second case the polaron effect is negligible.

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Fialko, N. S., and V. D. Lakhno. "Numerical Simulation of Small Radius Polaron in a Chain with Random Perturbations." Mathematical Biology and Bioinformatics 14, no. 1 (2019): 126–36. http://dx.doi.org/10.17537/2019.14.126.

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In a number of publications about biophysical experiments on the transfer of a charge to DNA, it is assumed that charge is transferred via a super-exchange mechanism at short distances of 2–3 nucleotide pairs, and in long fragments the charge forms a polaron that moves along the chain under the influence of temperature fluctuations. Using numerical simutation, we investigate the dynamics of a polaron of small radius in a homogeneous chain plaiced in constant electric field at a finite temperature. It is shown that there is no charge transfer by the polaron mechanism, i.e. there is no sequentia

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Mardonov, Shukhrat N., Bobir A. Toshmatov, Bobomurat J. Ahmedov, and Shukurillo T. Inoyatov. "Polaron Dynamics in a Quasi-Two-Dimensional Bose–Einstein Condensate." Universe 9, no. 2 (2023): 89. http://dx.doi.org/10.3390/universe9020089.

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The concept of polaron quasiparticles was first introduced in the pioneering papers by Landau and Feynman in the 1930s and 1940s. It describes the phenomenon of an external particle producing a bound state in an embedded medium. Since then, the study of polaron quasiparticles has been an active area of research in condensed matter physics, with a wide range of applications in magnetic phenomena and lattice deformation properties. In this paper, we provide a comprehensive review of the polaron quasiparticle phenomenon, including its historical origins, theoretical developments, and current rese

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YAVIDOV, BAKHROM. "EFFECT OF LONG-RANGE DENSITY-DISPLACEMENT TYPE INTERACTION ON SMALL POLARON." International Journal of Modern Physics B 24, no. 32 (2010): 6323–33. http://dx.doi.org/10.1142/s0217979210057626.

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In this work, renormalization of effective mass of an electron due to small polaron formation is studied within the framework of Extended Holstein model. It is assumed that electron moves along one-dimensional chain of ions and interacts with ions vibrations of neighboring chain via long-range density–displacement type force. By means of exact calculations, renormalized mass of nonadiabatic small polaron is obtained at strong coupling limit. Obtained results compared with those of small polaron mass of ordinary Holstein model. An effect of ions vibrations polarization on small polaron mass is

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Mishchenko, A. S., N. V. Prokof'ev, B. V. Svistunov, and A. Sakamoto. "Comprehensive study of Fröhlich polaron." International Journal of Modern Physics B 15, no. 28n30 (2001): 3940–43. http://dx.doi.org/10.1142/s0217979201009050.

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A study of the Fröhlich polaron model is performed on the basis of diagrammatic quantum Monte Carlo technique which is enhanced by novel method of spectral analysis of the polaron Green function. We make available for the first time precise data for the effective mass, including the region of intermediate and strong couplings, and analyze the structure of the polaron cloud. A non-trivial structure of the spectral density is observed: at high enough couplings the spectral continuum features pronounced peaks that we attribute to unstable excited states of the polaron.

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LI, ZHIXIN, JUAN XIAO, AIYONG LIU, and JINGLIN XIAO. "EFFECTIVE MASS OF STRONG-COUPLED BOUND POLARON IN AN ASYMMETRIC QUANTUM DOT INDUCED WITH RASHBA EFFECT." International Journal of Nanoscience 10, no. 03 (2011): 501–5. http://dx.doi.org/10.1142/s0219581x11008265.

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In this paper, on the basis of Huybrechs' strong-coupled polaron model, the Tokuda-modified linear-combination operator method and the unitary transformation method are used to study the properties of the strong-coupled bound polaron considering the influence of Rashba effect, which is brought by the spin-orbit (SO) interaction, in an asymmetric quantum dot (QD). The expression for the effective mass of the polaron as functions of the transverse and longitudinal bound strengths, velocity, vibration frequency, and the bound potential has been derived. After a simple numerical calculation on the

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Korshunova, A. N., and V. D. Lakhno. "The Incipient Formation of the Internal Dynamics of a Uniformly Moving Polaron in a Polynucleotide Chain Subjected To a Constant Electric Field." Mathematical Biology and Bioinformatics 17, no. 2 (2022): 452–64. http://dx.doi.org/10.17537/2022.17.452.

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In this paper we consider the incipient formation of the internal dynamics of a uniformly moving polaron in a polynucleotide chain subjected to a constant electric field. The calculations performed show that Bloch oscillations arising in the course of the polaron oscillatory motion along the chain do not completely disappear when the polaron's motion along the chain becomes uniform. When the polaron moves uniformly along the chain, Bloch oscillations are also observed, although in a slightly different form. It is shown that the shape of the electron density distribution in a polaron during its

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Zhang, Xiao Yan, and Guo Liang Fan. "Polaron Effect on the D^- Center at the InP(GaP) Heterointerface in a Magnetic Field." Advanced Materials Research 430-432 (January 2012): 16–19. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.16.

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Effect of polaron on the spin triplet state (p-like) of the center is discussed by means of variational principle and second-order perturbation theory. Numerical results are produced for heterostructures of InP(GaP) in a magnetic field. We find that the polaron correction is very important. The contribution of the polaron is not negligible.

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Alekperov, O. Z., and N. M. Guseinov. "Polaron Energy Spectrum in a Disk-Shaped Quantum Dot." Modern Physics Letters B 17, no. 22 (2003): 1167–74. http://dx.doi.org/10.1142/s0217984903006190.

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The energy spectrum of a weak coupling polaron is considered in a disk-shaped quantum dot. An analytical expression for the polaron energy correction to the ground and the first excited state is calculated using a modified pertubation theory. Anticrossing of the polaron energy levels in the dependence on the quantum dot radius is obtained.

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BOGOLUBOV, NIKOLAI, ANNA GHAZARYAN, and YAREMA PRYKARPATSKY. "OPERATOR ANALYSIS OF AN RPA-REDUCED POLARON MODEL WITHIN THE BOGOLUBOV REPRESENTATION IN MAGNETIC FIELD AT FINITE TEMPERATURE. PART 1." International Journal of Modern Physics B 23, no. 24 (2009): 4843–53. http://dx.doi.org/10.1142/s0217979209053941.

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The polaron model in ionic crystal is studied in the N. Bogolubov representation using a special RPA-approximation. A new exactly solvable approximated polaron model is derived and described in detail. Its free energy at finite temperature is calculated analytically. The polaron free energy in the constant magnetic field at finite temperature is also discussed.

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ANGELESCU, NICOLAE, ROBERT A. MINLOS, and VALENTIN A. ZAGREBNOV. "LOWER SPECTRAL BRANCHES OF A PARTICLE COUPLED TO A BOSE FIELD." Reviews in Mathematical Physics 17, no. 10 (2005): 1111–42. http://dx.doi.org/10.1142/s0129055x05002509.

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The structure of the lower part (i.e. ε-away below the two-boson threshold) spectrum of Fröhlich's polaron Hamiltonian in the weak coupling regime is obtained in spatial dimension d ≥ 3. It contains a single polaron branch defined for total momentum p ∈ G(0), where G(0) ⊂ ℝd is a bounded domain, and, for any p ∈ ℝd, a manifold of polaron + one-boson states with boson momentum q in a bounded domain depending on p. The polaron becomes unstable and dissolves into the one-boson manifold at the boundary of G(0). The dispersion laws and generalized eigenfunctions are calculated.

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Gill, Caleb. "Polako." Massachusetts Review 60, no. 4 (2019): 707. http://dx.doi.org/10.1353/mar.2019.0103.

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Deal, Heather E. "Christian Congregations and Social and Political Action: A Review of the Literature." Social Work & Christianity 49, no. 3 (2022): 289–301. http://dx.doi.org/10.34043/swc.v49i3.303.

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Movements like Black Lives Matter, immigration, and the ever-widening income gap have ignited the conversation on social justice activism and Christian congregations (Miller & Polson, 2019). For social workers, congregations are valuable sites to develop stronger, more inclusive, and more just societies (Miller & Polson, 2019). There is significant research on Christian congregations that are active in social justice work--the types of work they do, motivations to engage, and the types of congregations who choose to engage. This review of literature focuses on the history of Christian

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Paranjape, V. V., and P. V. Panat. "Discrete lattice model for the large polaron." Canadian Journal of Physics 69, no. 5 (1991): 635–40. http://dx.doi.org/10.1139/p91-107.

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The energy states of a polaron in the weak-coupling limit were first obtained by Fröhlich and co-workers, assuming that the polarization of the lattice due to the electron is continuous. If the polaron radius is comparable to the lattice constant then the assumption is inappropriate. A model based on the discrete nature of the lattice is more suitable. Such a model, based on the semiclassical zero-point energy, is proposed. We have calculated the ground-state energy of the polaron and the energy of the polaron near the bottom of the conduction band. The first discussion of the effect of lattic

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Atencio, Carlos Emmanuel Núñez, and Alfredo Pelayo Calatayud Mendoza. "Impact of Institutional Quality on the Effectiveness of Monetary and Fiscal Policies in Peru Between 2005 and 2020." International Journal of Innovative Research and Scientific Studies 8, no. 3 (2025): 1692–702. https://doi.org/10.53894/ijirss.v8i3.6868.

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This study examines how institutional quality (measured by the ICRG and POLCON indices) impacts the effectiveness of monetary and fiscal policies in Peru between 2005 and 2020. Specifically, a Taylor-style monetary policy rule and a fiscal reaction function are jointly estimated, each augmented with an interaction between the output gap and the institutional quality measures. Moreover, the models incorporate inflation, exchange rate, and terms-of-trade gaps, alongside instrument lags and dummy variables. Monthly financial data come from the Central Reserve Bank of Peru, whereas ICRG and POLCON

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GUSEINOV, N. M., K. A. RUSTAMOV, and S. M. SEYID-RZAYEVA. "THE POLARON EFFECTS AND RELAXATION OF NON-EQUILIBRIUM ELECTRONS IN THE QUASI-TWO-DIMENSIONAL SYSTEMS." Modern Physics Letters B 05, no. 02 (1991): 139–49. http://dx.doi.org/10.1142/s0217984991000186.

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The problem on weak-coupling polaron in the quasi-two-dimensional electron system is solved. Analytical expressions for polaron energy shift of the subband and polaron contribution to the effective electron mass with arbitrary quantum well width are found. The expressions obtained give the well-known values for two- and three-dimensional limiting cases. A comparison of the polaron contribution to the mass with the available experimental data is carried out. Energy relaxation processes of non-equilibrium quasi-two-dimensional electrons with the optic phonon emission are also considered. General

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Caroline Sugirtham, L., A. John Peter, and Chang Woo Lee. "Effects of Polaron and Quantum Confinement on the Nonlinear Optical Properties in a GaAs/Ga1-xAlxAs Quantum Well Wire." Journal of Nanomaterials 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/823065.

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The binding energy of a polaron confined in a GaAs/Ga1-xAlxAs quantum well wire is calculated within the framework of the variational technique and Lee-Low Pines approach. The polaron-induced photoionization cross section as a function of normalized photon energy for a on-centre donor impurity in the quantum wire is investigated. The oscillator strength with the geometrical effect is studied taking into account the polaron effects in a GaAs/Ga0.8Al0.2As quantum well wire. The effect of polaron on the third-order susceptibility of third harmonic generation is studied. Our theoretical results ar

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MØLLER, JACOB SCHACH. "THE POLARON REVISITED." Reviews in Mathematical Physics 18, no. 05 (2006): 485–517. http://dx.doi.org/10.1142/s0129055x0600267x.

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In recent years, the spectral properties of the translation invariant Nelson model has been studied. Some of the results obtained did not extend to the related polaron model for technical reasons related to the typical assumption of boundedness of the phonon dispersion relation in the polaron model. In this paper, we work with a large class of linearly coupled translation invariant models which includes both the Nelson model and H. Fröhlich's polaron model. The problems considered are chosen based on relevance for the polaron model. A key input is an analysis of the behavior of the bottom of t

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Nugraha, Darya Setya, and Poppy Octavira. "Audit Tata Kelola IT dan Process Investasi Digital Library Menggunakan Pendekatan Framework Cobit 4.1." Indonesian Accounting Literacy Journal 2, no. 1 (2022): 254–68. http://dx.doi.org/10.35313/ialj.v2i1.3516.

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Bandung State Polytechnic already has a library information system, one of which is the Digilib system (Digital Library). Digilib makes it easy for both internal and external users to access digital collections quickly, anytime and anywhere to find research reference materials. However, until now, the Digilib Polban system has not run optimally. One way to optimize the management of the Digilib Polban information system is to carry out an Information System Audit to identify the Maturity Level of the Digilib Polban information system, so that it can be seen the extent of IT governance at the D

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