JETP Letters最新文献_第4页

Topological Crossover in the Chiral Superconducting d + id Phase at Finite Temperatures 有限温度下手性超导d + id相的拓扑交叉

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-04-01 DOI: 10.1134/S0021364024604470

A. G. Groshev, A. K. Arzhnikov

引用次数: 0

Parametric Light–Dark Spatiotemporal Soliton 参数光-暗时空孤子

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-04-01 DOI: 10.1134/S0021364024605049

S. V. Sazonov

引用次数: 0

Effect of Selenium, Copper and Silver Microparticles Obtained in Viscous Media on the Gram-Positive and Gram-Negative Bacteria Survival 粘性培养基中硒、铜和银微粒对革兰氏阳性和革兰氏阴性细菌存活的影响

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-04-01 DOI: 10.1134/S0021364024605190

I. N. Saraeva, E. R. Tolordava, R. A. Khmelnitsky, S. N. Shelygina, D. S. Pozdnyakova, A. A. Nastulyavichus, E. N. Rimskaya, A. E. Rupasov

{"title":"Effect of Selenium, Copper and Silver Microparticles Obtained in Viscous Media on the Gram-Positive and Gram-Negative Bacteria Survival","authors":"I. N. Saraeva, E. R. Tolordava, R. A. Khmelnitsky, S. N. Shelygina, D. S. Pozdnyakova, A. A. Nastulyavichus, E. N. Rimskaya, A. E. Rupasov","doi":"10.1134/S0021364024605190","DOIUrl":"10.1134/S0021364024605190","url":null,"abstract":"The work presents a multiparametric analysis of the effect of antibacterial nanogels based on nano- and (sub)microparticles of silver, copper and selenium on single- and multicomponent biofilms of gram-positive bacteria Staphylococcus aureus, Staphylococcus epidermidis, as well as gram-negative bacteria Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa. Nanogels are based on glycerol, silicone oil and Vaseline, which are low-costing biocompatible materials, suitable for use in wound dressings. The active components are bactericidal Ag, Cu, and Se nanoparticles. Nanogels and their effect on the bacterial biofilms were studied by standard microbiological inoculations, as well as Fourier transform infrared spectroscopy methods, followed by principal component analysis. After the treatment of biofilms with nanogels, a decrease in the bacterial population up to 99% was observed. Principal component analysis demonstrated the ability to differentiate viable from nonviable bacteria.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 4","pages":"306 - 314"},"PeriodicalIF":1.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024605190.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband X-Ray Diagnostics of a Relativistic Laser Plasma 相对论性激光等离子体的宽带x射线诊断

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-04-01 DOI: 10.1134/S0021364024604925

K. A. Ivanov, A. I. Sivko, I. N. Tsymbalov, G. Kh. Salakhutdinov, A. A. Kologrivov, A. A. Rupasov, E. A. Bolkhovitinov, R. V. Volkov, A. B. Savel’ev

引用次数: 0

Features of the Conductivity of Nominally Undoped Single-Crystal CVD Diamond 名义上未掺杂的单晶 CVD 金刚石的电导率特征

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-03-25 DOI: 10.1134/S0021364024605293

M. S. Kagan, S. K. Paprotskiy, N. A. Khvalkovskiy, I. V. Altukhov, N. B. Rodionov, A. P. Bol’shakov, V. G. Ral’chenko, R. A. Khmel’nitskiy

引用次数: 0

Spectral Properties of Terahertz Radiation from Laterally Structured Spintronic Emitters 侧向结构自旋电子发射器太赫兹辐射的光谱特性

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-03-25 DOI: 10.1134/S0021364024604639

E. A. Karashtin, N. S. Gusev, M. V. Sapozhnikov, P. Yu. Avdeev, A. L. Alfer’ev, E. D. Lebedeva, A. M. Buryakov, E. D. Mishina

{"title":"Spectral Properties of Terahertz Radiation from Laterally Structured Spintronic Emitters","authors":"E. A. Karashtin, N. S. Gusev, M. V. Sapozhnikov, P. Yu. Avdeev, A. L. Alfer’ev, E. D. Lebedeva, A. M. Buryakov, E. D. Mishina","doi":"10.1134/S0021364024604639","DOIUrl":"10.1134/S0021364024604639","url":null,"abstract":"In this work, the spectral properties of the terahertz radiation of a spintronic emitter based on the Co(2 nm)/Pt(2 nm) ferromagnet/heavy metal heterostructure and the periodic system of strips made of it (period from 4 μm to 1 mm) have been experimentally studied. Two main mechanisms that determine the terahertz spectrum of such emitters are demonstrated. The first of them is observed both in a continuous multilayer film and in a periodic lattice. In this mechanism, due to the interference of signals from different spatial regions of the emitter, the amplitude of the wave decreases with an increase in the angle between the normal to the film and the direction of radiation propagation, and the characteristic scale of this decrease depends on the wavelength. As a result, the increase in this angle is accompanied by the redshift of the spectral amplitude maximum of radiation. The second mechanism is possible only in the periodic system of strips. It occurs as the fact suppression of terahertz radiation due to the charge accumulation at the boundaries of the strips when periodic lattices with a short period are magnetized along the strips. This effect is more significant for longer wavelengths and is therefore accompanied by a blueshift of the spectral maximum. The mechanisms studied in this work will make it possible to create spintronic emitters of terahertz radiation with a given position of the spectral amplitude maximum of terahertz radiation.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 3","pages":"195 - 201"},"PeriodicalIF":1.4,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024604639.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Generation of a Stable Femtosecond Supercontinuum in a Divergent Laser Beam for Time-Resolved Broadband Spectroscopy of Laser-Induced Processes in Matter 在发散激光束中产生稳定的飞秒超连续体，用于激光诱导物质过程的时间分辨宽带光谱

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-03-25 DOI: 10.1134/S002136402460383X

E. I. Mareev, N. M. Asharchuk, E. O. Epifanov, F. V. Potemkin

{"title":"Generation of a Stable Femtosecond Supercontinuum in a Divergent Laser Beam for Time-Resolved Broadband Spectroscopy of Laser-Induced Processes in Matter","authors":"E. I. Mareev, N. M. Asharchuk, E. O. Epifanov, F. V. Potemkin","doi":"10.1134/S002136402460383X","DOIUrl":"10.1134/S002136402460383X","url":null,"abstract":"Time-resolved absorption spectroscopy with subnanosecond time resolution requires sources of white light with short or ultrashort durations, which can be synchronized with other laser systems. Using a near-infrared femtosecond laser source, a supercontinuum with a high spectral brightness (~10 pJ/nm), a high pulse-to-pulse stability of about 2–5%, and a long-term (several hours) stability has been generated in the spectral range of ~450–750 nm. These supercontinuum characteristics have been achieved by operating in a divergent beam, which makes it possible to avoid multiple filamentation, to stabilize the spectrum (halving fluctuations and a wider energy stability range), and to broaden it by changing the dynamic balance between Kerr focusing, plasma defocusing, and diffraction. Time resolution has been achieved by means of a specially developed electronic delay system based on field-programmable gate arrays, which has made it possible to achieve subnanosecond time resolution in a wide time window (up to several milliseconds). This technique has been successfully tested in experiments to study the dynamics of silicon ablation under nanosecond laser impact.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 3","pages":"175 - 181"},"PeriodicalIF":1.4,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S002136402460383X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of the Deformation on the Conductivity of the Quasi-One-Dimensional Conductor K0.3MoO3 in the Peierls State 形变对准一维导体K0.3MoO3在peerls态电导率的影响

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-03-25 DOI: 10.1134/S002136402460513X

S. G. Zybtsev, V. Ya. Pokrovskii, S. V. Zaitsev-Zotov

引用次数: 0

Determination of the Character of the Interaction of Bioactive Ions with Phospholipid Membranes Using Nonlinear Microscopy Methods 利用非线性显微镜方法确定生物活性离子与磷脂膜相互作用的特性

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-03-25 DOI: 10.1134/S0021364024605098

M. Yu. Eremchev, A. V. Naumov

{"title":"Determination of the Character of the Interaction of Bioactive Ions with Phospholipid Membranes Using Nonlinear Microscopy Methods","authors":"M. Yu. Eremchev, A. V. Naumov","doi":"10.1134/S0021364024605098","DOIUrl":"10.1134/S0021364024605098","url":null,"abstract":"The study of electrostatic and chemical interactions and transformations on the surface of lipid membranes is crucial for estimating the efficiency and toxicity of different drugs, as well as the mechanisms for their delivery. The description of these interactions at a molecular level requires the use of highly sensitive non-invasive methods. This work presents the experimental results demonstrating the capability of second harmonic generation microscopy to study electrochemical processes affecting the structure of a narrow (<1 nm) hydration layer of model cell membranes. On the example of bioactive potassium and calcium ions of different concentrations, a unique sensitivity of this method to a change in the surface potential of membranes has been demonstrated. An increase in the ionic strength of the solution above 15 mM in the case of calcium ions leads to a complete neutralization of the membrane surface, while potassium ions only partially screen the surface charge of a membrane. It has been shown that a change in the structure and composition of membranes leads to the emergence of steric effects in the interaction of head groups of lipids with water molecules in the hydration layer.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 3","pages":"225 - 230"},"PeriodicalIF":1.4,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364024605098.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectroscopic Study of the Multiferroic LiCoPO4: Magnetostructural Phase Transition 多铁LiCoPO4的光谱研究：磁结构相变

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-03-25 DOI: 10.1134/S0021364024604603

S. A. Klimin, A. D. Molchanova, V. A. Chernyshev, V. N. Denisov, N. N. Novikova, V. A. Yakovlev

引用次数: 0