Results 31 to 40 of about 78,093 (245)
Selection and focusing of higher-order modes in a CW waveguide terahertz laser
Вісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електроніка, 2022 Background: The problems of selection and focusing of higher order modes of a dielectric waveguide laser are considered. The proposed and investigated scheme of mode selection in waveguide quasi-optical resonators can be used in the development and ...
O. V. Gurin +7 more
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Sharp focusing of light using a planar gradient microlens
Computer Optics, 2016 It is shown numerically that using planar gradient microlenses, the coherent radiation can be focused in a narrow line of width λ/38 and length λ/5.5. The efficiency of focusing is 22%. A slitted photonic-crystal lens retains the properties of sharp focusing of light characteristic of a gradient lens.
A. Nalimov, V. Kotlyar
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Advanced Photonics Research, 2021 The performance of an ultrathin (thickness
Santiago Legaria +4 more
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The aqueous supramolecular chemistry of crown ethers
Frontiers in Chemistry, 2023 This mini-review summarizes the seminal exploration of aqueous supramolecular chemistry of crown ether macrocycles. In history, most research of crown ethers were focusing on their supramolecular chemistry in organic phase or in gas phase.
Zhenhui Qi +8 more
doaj +1 more source
Physics of Fluids, 2023 Precise manipulation of fluids and objects on the microscale is seldom a simple task, but, nevertheless, crucial for many applications in life sciences and chemical engineering. We present a microfluidic chip fabricated in silicon–glass, featuring one or several pairs of acoustically excited sharp edges at side channels that drive a pumping flow ...
Alen Pavlic +4 more
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Time after time – circadian clocks through the lens of oscillator theory
FEBS Letters, EarlyView.Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo +2 more
wiley +1 more source
Characteristics of sharp focusing of vortex Laguerre-Gaussian beams
Computer Optics, 2015 We investigate the intensity distribution of sharply focused Laguerre-Gaussian beams in relation to the uniform (linear and circular) polarization of the beam and the order of the vortex phase. It is shown that to the greatest extent the polarization state affects the longitudinal component of the electric vector of the light field. The greatest visual
D. Savelyev, S. Khonina
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In situ molecular organization and heterogeneity of the Legionella Dot/Icm T4SS
FEBS Letters, EarlyView.We present a nearly complete in situ model of the Legionella Dot/Icm type IV secretion system, revealing its central secretion channel and identifying new components. Using cryo‐electron tomography with AI‐based modeling, our work highlights the structure, variability, and mechanism of this complex nanomachine, advancing understanding of bacterial ...
Przemysław Dutka +11 more
wiley +1 more source
Optical System Design of Oblique Airborne-Mapping Camera with Focusing Function
Photonics, 2022 The use of airborne-mapping technology plays a key role in the acquisition of large-scale basic geographic data information, especially in various important civil/military-mapping missions. However, most airborne-mapping cameras are limited by parameters,
Hongwei Zhang +4 more
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FEBS Letters, EarlyView.The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li +2 more
wiley +1 more source