Quantum memory for light via stimulated off-resonant Raman process: beyond the three-level Lambda-scheme approximation

We consider a quantum memory scheme based on the conversion of a signal pulse into a long-lived spin coherence via stimulated off-resonant Raman process. For a storing medium consisting of alkali atoms, we have calculated the Autler-Townes resonance structure created by a strong control field. By taking into account the upper hyperfine states of the D1 optical transition, we show important deviations from the predictions of the usual three-level Lambda-scheme approximation and we demonstrate an enhancement of the process for particular detunings of the control. We estimate the memory efficiency one can obtain using this configuration.Comment: 8 pages, 6 figure

Surgical management of ovarian dermoid cysts in children and adolescents

Department of Obstetrics and Gynecology, Medical University “N. Testemitsanu”, Kishinev, MoldovaIntroduction: The ovarian dermoid cysts are one of the most common neoplastic ovarian injuries found both in children and teenagers. For the girls with small ovarian diseases organ preserving operation it's extremely important for a proper functioning of puberty and future fertility. Purpose and Objectives: The aim of study was to present the reasons for making these surgeries in all the cases of ovarian dermoid cysts in order to ensure fertility and menstruation every month. Methods and materials: A prospective and retrospective analysis of all the ovarian cysts both in children and teenagers aged between 8 and 18, from the year 2000 through 2012 admitted in the Institute of Mother and Child Care, the department of operative gynecology was performed. Results: The ovarian dermoid cysts were localized mostly in the right side having a percentage of 64.7 vs. 35.3 for the left side. Cysts outermost dimension were 79.6±7.2 mm (95% CI:64.30-94.82) and minimum were - 65.1±6.5 mm (95% C l:51.21 -79.04), from 56 to 156 mm. Laparatomy was the surgery that was mostly used - 14/17 (82.4%), and laparoscopy was done only in 3/17 (17.6% ) cases. All of the organ preserving operations were statistically more common (p<0.001) over ovariectomy and were 14/17 (82.4%) vs. 3/17 (17.6%). Conclusions: It is vital to have a proper surgical approach for all the children and teenagers with ovarian cysts for maintaining a good sexual growth and fertility in the near future. These surgeries are the best method for this group of patient

High frequency polarization switching of a thin ferroelectric film

We consider both experimentally and analytically the transient oscillatory process that arises when a rapid change in voltage is applied to a $Ba_xSr_{1-x}TiO_3$ ferroelectric thin film deposited on an $Mg0$ substrate. High frequency ($\approx 10^{8} rad/s$) polarization oscillations are observed in the ferroelectric sample. These can be understood using a simple field-polarization model. In particular we obtain analytic expressions for the oscillation frequency and the decay time of the polarization fluctuation in terms of the material parameters. These estimations agree well with the experimental results

Optical second harmonic generation probe of two-dimensional ferroelectricity

Optical second harmonic generation (SHG) is used as a noninvasive probe of two-dimensional (2D) ferroelectricity in Langmuir-Blodgett (LB) films of copolymer vinylidene fluoride with trifluorethylene. The surface 2D ferroelectric-paraelectric phase transition in the topmost layer of LB films and a thickness independent (almost 2D) transition in the bulk of these films are observed in temperature studies of SHG.Comment: 9 pages, 2 figures, Optics Letters, in prin

Features of clinical manifestations and diagnosis of comorbidity of disseminated pulmonary tuberculosis, coronavirus, pneumocystis and pneumococcal pneumonia in patients with late stages of HIV infection with immunodeficiency

Aim. To study the features of clinical manifestations and diagnosis of comorbidity of disseminated pulmonary tuberculosis, coronavirus, pneumocystis and pneumococcal pneumonia in patients with late stages of HIV infection with immunodeficiency. Materials and methods. The prospective study included 120 newly identified patients with disseminated pulmonary tuberculosis with Mycobacterium tuberculosis, stage IVB of HIV infection, in the phase of progression and in the absence of antiretroviral therapy, aged 2953 years, who were randomized into 1A and 2A main groups and 1B and 2B comparison groups. Group 1A included 29 patients with comorbidity and pneumocystis pneumonia and group 2A 31 patients with comorbidity of disseminated pulmonary tuberculosis, coronovirus pneumococcal pneumonia, and group 1B and 2B comprised 29 and 31 similar patients, but without coronovirus pneumonia. To diagnose coronavirus pneumonia, PCR of SARS-CoV-2 RNA was used in smears from the nasopharynx and oropharynx, in sputum or in endotracheal aspirate. To detect Pneumocystis jirovecii, the causative agent of pneumocystis pneumonia, a microscopic examination of diagnostic material from the respiratory tract with RomanovskyGiemse and GrokottGmri coloration was carried out, and to detect Streptococcus pneumoniae, the causative agent of pneumococcal pneumonia, the diagnostic material was seeded on special nutrient media with determination of the drug resistance of the resulting culture to broad-spectrum antibiotics. Statistical data processing was carried out using the Microsoft Office Excel 2019 program with the calculation of the average in the group and the standard error of the average, confidence interval. Results. The comorbidity of disseminated pulmonary tuberculosis, coronavirus, pneumocystis and pneumococcal pneumonia in patients in the late stages of HIV infection, in the phase of progression and in the absence of antiretroviral therapy was characterized by severe immunodeficiency, generalization of tuberculosis with multiple extrapulmonary lesions and severe pneumonia. This determines the similarity of clinical manifestations and respiratory symptoms, and also makes it difficult to visualize computed tomographic changes consisting of a complex simultaneous combination of four pathological syndromes: dissemination, pleural pathology, increased pulmonary pattern and adenopathy. Simultaneous layering of several pathologies with the same type of clinical manifestations and computed tomographic changes requires a comprehensive etiological diagnosis of specific diseases to prescribe timely comprehensive treatment and reduce the lethality of this heavy contingent of patients. Conclusion. Patients with disseminated pulmonary tuberculosis and HIV infection who are registered in the office of tuberculosis care for HIV-infected in the tuberculosis dispensary represent a high risk group of COVID-19 infection and the development of coronavirus pneumonia, and with severe immunodeficiency, pneumocystis and pneumococcal pneumonia, should be regularly subjected to preventive studies for timely detection of COVID-19, coronavirus, pneumocystis and pneumococcal pneumonia for the purpose of their emergency isolation and timely treatment

Efficiency of various methods of injection of antituberculosis agents in young patients with destructive pulmonary tuberculosis

The article presents the data of the randomized clinical trial of 80 young patients with destructive pulmonary tuberculosis for various methods of TB drugs injection. Particular attention is paid to the role of parenteral drug delivery. The work demonstrated that newly diagnosed patients with destructive pulmonary tuberculosis of younger age the most optimal and effective is parenteral injection of injectable forms of TB drugs, allowing to halt bacterioexcretion for 3 months in 92.5 % of cases and to close cavities in the lungs in 80 %. In newly diagnosed patients with destructive pulmonary tuberculosis of young age oral use of tablets and of TB drugs is not effective enough, allowing to achieve 3 months cessation of bacterial isolation in 85.2 % of cases and to close cavities in the lungs in 42.5 %. Undesirable side reactions to parenteral administration of injectable forms of TB drugs were detected in 17.5 % of patients and to separate oral tablet forms - in 20 %, fatal reactions were observed in 5 % of cases of drug delivery regardless of method

Aqueous and salt solutions of quinine of low concentrations: Self-organization, physicochemical properties and actions on the electrical characteristics of neurons

© 2014, Pleiades Publishing, Inc. Self-organization, the physicochemical properties of aqueous and salt solutions of quinine and the effects of salt quinine solutions in a wide range of concentrations (1 · 10−22−1 · 10−3 M) on the electrical characteristics of the edible snail’s identified neurons were studied. Similar non-monotonic concentration dependencies of physicochemical properties of aqueous and salt quinine solutions at low concentrations are obtained. This allows of predicting the occurrence of biological effects at low concentrations of quinine solutions. Intrinsic (within 5% of the interval) changes in membrane potential, the amplitude and duration of the neuron action potential under the influence of quinine salt solutions at concentrations of quinine of 1 · 10−20, 1 · 10−18, 1 · 10−10 M are found. For these concentrations the extreme values of specific conductivity and pH are shown

Green manure - corn rotation and phosphorus adsorption in an Oxisol

Este estudo teve como objetivos quantificar a capacidade máxima de adsorção de P em sistemas de cultivo com adubos verdes e avaliar a influência da taxa de decomposição do adubo verde e de algumas propriedades químicas do solo sobre esta adsorção. Avaliou-se a camada de 0 a 20 cm de um Latossolo Vermelho-Escuro sob dois tratamentos: solo sob cerrado nativo e solo descoberto (cinco anos); e os seguintes adubos verdes cultivados na entressafra após o milho (cv. Pioneer 3072): crotalária (Crotalaria juncea), guandu (Cajanus cajan), mucuna preta (Mucuna aterrima) e braquiária (Brachiaria ruziziensis). Os valores de adsorção foram ajustados à isoterma de Langmuir para determinação da capacidade máxima de adsorção de P (CMAF). Os tratamentos em ordem decrescente de adsorção máxima foram: solo descoberto > guandu > crotalária > mucuna preta > braquiária > cerrado nativo. O teor de matéria orgânica e a taxa de decomposição dos adubos verdes apresentaram correlação negativa com a adsorção máxima de P, com coeficientes de correlação, respectivamente, de 0,705 (P Cajanus cajan > Crotalaria juncea > Mucuna aterrima > Brachiaria ruziziensis > native cerrado. Soil organic matter amount and green manure decomposition rate had negative correlation with the P maximum adsorption, with correlation coefficients of 0.705 (P < 0.06) and 0.983 (P < 0.01), respectively. The PAMC for the deepest layer was 56% higher than that of the superficial layer, suggesting the importance of organic matter on reducing P adsorption

Туберкулез и микобактериоз легких у больных на поздних стадиях ВИЧ-инфекции

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Quantum hologram of macroscopically entangled light via the mechanism of diffuse light storage

In the present paper we consider a quantum memory scheme for light diffusely propagating through a spatially disordered atomic gas. The diffuse trapping of the signal light pulse can be naturally integrated with the mechanism of stimulated Raman conversion into a long-lived spin coherence. Then the quantum state of the light can be mapped onto the disordered atomic spin subsystem and can be stored in it for a relatively long time. The proposed memory scheme can be applicable for storage of the macroscopic analog of the $\Psi^{(-)}$ Bell state and the prepared entangled atomic state performs its quantum hologram, which suggests the possibility of further quantum information processing.Comment: Submitted to Journal of Physics B: Atomic, Molecular and Optical Physics. Special Issue on Quantum Memorie