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spin texturing in a parabolically confined quantum wire with Rashba and Dresselhaus spin-orbit interactions

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Chinese Physics B 2014年第1期23卷 347-356页

作者： s. sarıkurt s. Şakiroğlu K. Akgüngör İ sökmen Dokuz Eylül University The Graduate School of Natural and Applied Sciences Physics Department Tınaztepe Campus 35390 İzmir Turkey Dokuz Eylül University Faculty of Science Physics Department Tınaztepe Campus 35390 İzmir Turkey

In this study, we investigate theoretically the effect of spin-orbit coupling on the energy level spectrum and spin texturing of a quantum wire with a parabolic confining potential subjected to the perpendicular magnetic field. Highly accurate numerical calculations have been carried out using a finite element method. Our results reveal that the interplay between the spin-orbit interaction and the effective magnetic field significantly modifies the band structure, producing additional subband extrema and energy gaps. Competing effects between external field and spin-orbit interactions introduce comp｜ex features in spin texturing owing to the couplings in energy subbands. We obtain that spatia~ modulation of the spin density along the wire width can be considerably modified by the spin-orbit coupling strength, magnetic field and charge carrier concentration.

关键词： spin—orbit coupling zeeman splitting quantum wire spin texture

Phenolic Profile and Volatiles of in vitro Propagated Lavandula angustifolia ***

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Phyton-International Journal of Experimental Botany 2024年第3期93卷 427-444页

作者： Mir Abdullatif Yahya Fatma Tunali Dilek Killi Atalay sökmen Biotechnology Department Konya Food and Agriculture UniversityKonya42080Türkiye Plant Production and Technologies Department Konya Food and Agriculture UniversityKonya42080Türkiye

An effective in vitro propagation protocol was designed for Lavandula angustifolia Miller,a medicinal aromatic plant that is a prominent source of volatile organic compounds(VOCs).Murashige and skoog media were supplemented with various concentrations of Plant Growth Regulators(PGRs),and the growth parameters of the nodal segments were *** explants formed callus when they were supplemented with 2 mg/L of 6-Benzylaminopurine(BAP).The superior hormonal concentration of Murashige and skoog(Ms)media for the proliferation of shoots from callus cultures(39.33%)was 5 mg/L of 2-Isopentenyl adenine(2iP),and the favorable media for the growth of *** callus cultures was 1 and 2 mg/L of BAP,with a 98%for-mation rate in each *** callus cultures and in vitro propagated *** seedlings obtained from var-ious PGR concentrations of Ms media were exposed to qualitative and quantitative analysis in terms of phenolic proﬁles,ﬂavonoids,High-performance liquid chromatography(HPLC)analysis of phenolic acids,and headspace-sPME analysis for *** analysis revealed that micropropagated seedlings grown in media containing 1 mg/L of 6-Furfurylaminopurine(KIN)accumulated the highest yield(11.95±0.01 mg GAE/g)of phenolic *** contrast,the lowest concentration(2.17±0.04 mg GAE/g)was detected in 0.5 mg/L of BAP+0.5 mg/L of Naphthaleneacetic acid(NAA)*** plantlets grown in 0.5 mg/L of BAP+0.5 mg/L of NAA media showed the highestﬂavonoid yield(31.67±0.06μg/g QE/g).In contrast,callus samples exhibited the lowest yield(11.59±0.02μg/g QE/g)ofﬂavonoids in Ms media supplemented with a concentration of 0.5 mg/L of *** analysis revealed the variability of phenolic acid contents within the callus cultures as well as plantlets,with gallic acid,4-OH benzoic acid,chlorogenic acid,vanillic acid,caffeic acid,cinnamic acid,and rosmarinic acid being the prominent *** presence of twenty-two chemicals was revealed by headspace-sPME ***

关键词： Lavender indirect organogenesis micropropagation This

Effects of an Intense Laser Field and Hydrostatic Pressure on the Intersubband Transitions and Binding Energy of shallow Donor Impurities in a Quantum Well

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Chinese Physics Letters 2011年第7期28卷 254-257页

作者： U.Yesilgul F.Ungan E.Kasapoglu H.sari I.sökmen Department of Physics Cumhuriyet University58140 SivasTurkey Department of Physics Dokuz Eylül University35160 IzmirTurkey

We have calculated the intersubband transitions and the ground-state binding energies of a hydrogenic donor impurity in a quantum well in the presence of a high-frequency laser field and hydrostatic *** calculations are performed within the effective mass approximation,using a variational *** conclude that the laser field amplitude and the hydrostatic pressure provide an important effect on the electronic and optical properties of the quantum *** to the results obtained from the present work,it is deduced that(i)the binding energies of donor impurity decrease as the laser field increase,(ii)the binding energies of donor impurity increase as the hydrostatic pressure increase,(iii)the intersubband absorption coefficients shift toward lower energies as the hydrostatic pressure increases,(iv)the magnitude of absorption coefficients decrease and also shift toward higher energies as the laser field *** is hopeful that the obtained results will provide important improvements in device applications.

关键词： method hydrostatic donor

Ground state energy of excitons in quantum dot treated variationally via Hylleraas-like wavefunction

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Chinese Physics B 2009年第4期18卷 1578-1585页

作者： s. sakiroglu . Dogan A. Yιldιz K. Akgngr H. Epik Y. Ergn H. sarι . skmen Physics Department Dokuz Eyll University Physics Department Anadolu University Physics Department Cumhuriyet University

In this work, the effects of quantum confinement on the ground state energy of a correlated electron-hole pair in a spherical and in a disc-like quantum dot have been investigated as a function of quantum dot size. Under parabolic confinement potential and within effective mass approximation Ritz＇s variational method is applied to Hylleraas-like trial wavefunction. An efficient method for reducing the main effort of the calculation of terms like τekh exp （-λτeh） is introduced. The main contribution of the present work is the introduction of integral transforms which provide the calculation of expectation value of energy and the related matrix elements to be done analytically over single-particle coordinates instead of Hvlleraas coordinates.

关键词： exciton parabolic confinement variational method Hylleraas coordinates

Fourier transform technique in variational treatment of two-electron parabolic quantum dot

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Chinese Physics B 2009年第8期18卷 3508-3516页

作者： s.sakiroglu A.Yιldιz .Dogan K.Akgngr H.Epik Y.Ergn H.sarι .skmen Physics Department Dokuz Eyll University Physics Department Anadolu University Physics Department Cumhuriyet University

In this work, we propose an efficient method of reducing the computational effort of variational calculation with a Hylleraas-like trial wavefunction. The method consists of introducing integral transforms for the terms as r12^κ exp （-λτ12） which provide the calculation of the expectation value of energy and the relevant matrix elements to be done analytically over single-electron coordinates instead of Hylleraas coordinates. We have used this method to calculate the ground state energy of a two-electron system in a spherical dot and a disk-like quantum dot separately. Under parabolic confinement potential and within effective mass approximation size and shape effects of quantum dots on the ground state energy of two electrons have been investigated. The calculation shows that our results even with a small number of basis states are in good agreement with previous theoretical results.

关键词： two-electron quantum dot parabolic confinement variational method Hylleraas coor- dinates

Investigation of the working conditions of nurses in public hospitals on the basis of nurse-friendly hospital criteria

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International Journal of Nursing sciences 2018年第2期5卷 206-212页

作者： Fatma Er serap sokmen Vocational school of Health services Department of Health Care ServicesBingol UniversityBingolTurkey Faculty of Health sciences Department of NursingErzincan UniversityErzincanTurkey

Objective:This descriptive study reveals how nurses working in public hospitals rated their practice environments with respect to nurse-friendly hospital ***:This study was conducted on 460 nurses volunteering to participate this study among 735 nurses working in inpatient wards of three public *** were collected using a personal information form and the Adapted Nursing Work ***,percentages,means and standard deviations,t-test and one-way variance analysis were used to evaluate the ***:Among the nurse-friendly hospital criteria,‘control of nursing practice’,‘middle management accountability’and‘quality initiatives’had the highest mean scores,and‘competitive wages’had the lowest mean *** assessments of the nurses presented statistically significant differences with respect to personal and occupational ***:The nurses found most of the nurse-friendly hospital criteria adequate,but they believed that several areas needed improvement.

关键词： Nurses Nurse-friendly hospital criteria Positive work environment

颈部食管的异位胃黏膜:是否参与了后壁喉炎患者咽喉部反流的发病机制

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世界核心医学期刊文摘（胃肠病学分册） 2006年第4期2卷 59-60页

作者： Akbayir N skmen H.M al iA.B. 成虹 Huseyin pasa sok. No: 23/10 Istanbul 34724 TurkeyDr.

Objective. Acid secretion produced by a heterotopic gastric mucosal patch (HGMP) in the proximal esophagus, instead of gastric acid, may be responsible for laryngopharyngeal reflux (LPR), passing the upper esophageal sphincter. The aim of this study was to investigate the prevalence of HGMP in the proximal esophagus in patients with posterior laryngitis indicating the presenc e of LPR in comparison with a control group and to elucidate the possible role o f this lesion in the pathogenesis of LPR. Material and methods. A total of 36 co nsecutive patients with posterior laryngitis diagnosed on laryngoscopic examinat ion were enrolled in the study. Esophagoscopy and ambulatory 24 h intra-esophag eal dual-probe pH monitoring were performed in all patients. During endoscopy, special attention was paid to the proximal part of the esophagus, and the proxim al electrode for pH monitoring was placed in this region under endoscopic view. The control group comprised 660 consecutive patients who had undergone upper gas trointestinal endoscopy for the usual indications. When HGMP was found, biopsies were taken for histological confirmation. Results. HGMP was detected in 5 out o f 36 patients. One out of five patients with patches was excluded from the study because the histopathology of this patient‘s patch revealed antral-type mucos a, which is not capable of acid secretion. Thus a total of 35 patients were incl uded in the study, yielding a HGMP prevalence of 11.4%(4/35). Compared with the prevalence of the control group (1.6%), a significant difference was observed (p showed that 45.4%of the patients had abnormal proxim al acid reflux. All of four HGMP (+) patients with posterior laryngitis reveale d significantly higher abnormal proximal reflux compared to the patients without patches (p sions. This first preliminary study may suggest that HGMP in the cervical esophagus could play a role in the pathogenesis of LPR, at least in a minor g

关键词：颈部食管异位胃黏膜咽喉部发病机制酸反流近端酸刺激消化道内镜检查组织学检查喉镜检查

Fair-News: Digital Journalism Model to Prevent Information Pollution and Manipulation

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Computers, Materials & Continua 2023年第6期75卷 6059-6082页

作者： savas Takan Duygu Ergün Gökmen Katipoglu Department of Artificial Intelligence and Data Engineering Ankara UniversityAnkara06830Turkey Faculty of Fine Arts Design&Architecture Fine Arts and Elective CoursesAtılım UniversityAnkara06830Turkey Department of Computer Engineering Kafkas UniversityKars36100Turkey

As digital data circulation increases,information pollution and manipulation in journalism have become more *** this study,a new digital journalism model is designed to contribute to the solution of the main current problems,such as information pollution,manipulation,and account-ability in digital *** model uses blockchain technology due to its transparency,immutability,and ***,it is tough to provide the mechanisms necessary for journalism,such as updating one piece of information,instantly updating all other information affected by the updated information,establishing logical relationships between news,making quick comparisons,sorting and indexing news,and keeping the changing informa-tion about the news in the system,with the blockchain data *** this reason,in our study,we have developed a new data structure that provides both the immutability,transparency and traceability properties of the blockchain and can support the communication mechanisms necessary for *** functionality of our proposed data structure is demonstrated in terms of communication mechanisms such as mutability,context,consistency,and reliability through example ***,our data structure is compared with the data structure of blockchain technology in terms of time,space,and maintenance ***,while the model size increases linearly in blockchain,the model’s size remains approximately constant since the structure we developed is *** this way,maintenance costs are *** our model also has an indexing mechanism,it reduces the linear time search complexity to logarithmic *** a result,the data structure we developed is found to have higher performance than blockchain in the journalism *** future studies,it is planned to test all aspects of the model with a pilot application,eliminate its shortcomings,and develop a holistic approach to the root causes of the problems in the journalism

关键词： Digital journalism data structure news-sharing platform verification mechanism distributed ledger new media information pollution and manipulation

survival of some food-borne bacteria in kefir produced by microbial levan and pullulan

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Food Bioscience 2022年第3期47卷 1082-1089页

作者： Gökhan Gurur Gökmen Jaroslaw Kowalik Duygu Kışla Department of Food Engineering Faculty of EngineeringEge University35100BornovaIzmirTurkey Department of Dairy science and Quality Management Faculty of Food SciencesUniversity of Warmia and Mazury in OlsztynOczapowskiego str.710-719OlsztynPoland

Kefir is a fermented milk product produced by kefir grains traditionally or lyophilized starter *** quality characteristics of kefir produced at 22℃ and 30℃ using kefir grains after addition of microbial levan and pullulan were investigated for 14 ***,the survival of different Gram-positive and Gram-negative bacteria strains which were inoculated before and after fermentation were investigated during *** pH and titratable acidity were in the ranges of 4.67–4.39 and 1.10–0.87%,*** highest exopolysaccharide values(458.3–465.3 mg/kg)were found in the samples produced with the addition of 1%(w/v)of microbial levan at 30℃.Yeast counts were in the ranges of 6.73–5.11 log CFU/mL while the lactobacilli and lactic streptococci counts were in the ranges of 9.64–7.91 and 9.64–8.69 log CFU/mL,*** microbial polysaccharide addition did not show any significant differences in the enumeration of lactic acid bacteria in kefir(p>0.05).All Gram-positive and Gram-negative bacteria grew/survived during fermentation however Listeria monocytogenes was the most susceptible test bacterium to metabolites during *** highest reduction in the counts of *** was determined as 2.39 log units after 24 h of fermentation at 30℃ in the samples which were inoculated before fermentation and produced with the addition of *** samples produced at 30℃ without polysaccharide addition were considered as the best with respect to appearance,taste,consistency and overall acceptability.

关键词： Kefir grain Levan Pullulan Food-borne bacteria