Results 81 to 90 of about 1,176,456 (219)

Thin‐film lithium niobate photonics: Frontiers in millimeter‐wave and terahertz generation and integrated applications

InfoScience, Volume 3, Issue 3, September 2026.
With the advancement of 6G communications, high‐precision radar, and advanced imaging technologies, there is a growing demand for compact, high‐performance light sources capable of generating high‐frequency radio waves (millimeter‐wave and terahertz waves). This article systematically introduces how to efficiently generate these high‐frequency waves on
Jianfeng Xiong, Zhenyu Wang, Xu Li, Guo Tang, Sizhe Wang, Jiyuan Huang, Guochao Wang, Shuhua Yan, Wenzhao Sun   +8 more
wiley   +1 more source

ALMA Reveals Diverse Dust-to-gas Mass Ratios and Quenching Modes in Old Quiescent Galaxies

The Astrophysical Journal Letters
Recent discoveries of dust and molecular gas in quiescent galaxies (QGs) up to z ∼ 4 challenge the long-standing view that the interstellar medium depletes rapidly once star formation ceases, raising key questions of whether dust and gas coevolve in QGs,
G. Lorenzon, D. Donevski, A. W. S. Man, M. Romano, K. E. Whitaker, S. Belli, D. Liu, M. M. Lee, D. Narayanan, A. Long, I. Shivaei, A. Nanni, K. Lisiecki, P. Sawant, G. Rodighiero, I. Damjanov, Junais, R. Davé, C. Pappalardo, C. Lovell, M. Hamed   +20 more
doaj   +1 more source

The Great Cosmic Silence: What Does the Fermi Paradox Tell About the Future of Humanity?

Global Policy, Volume 17, Issue 4, Page 553-565, September 2026.
ABSTRACT This article examines how institutional time horizons shape the long‐term survival prospects of human technological civilisation. While research on global catastrophic and existential risks has expanded, the temporal structures of political‐economic institutions remain underexamined.
Heikki Patomäki
wiley   +1 more source

Molecules in diffuse interstellar clouds [PDF]

, 1988
The existence of diatomic molecules in the diffuse interstellar gas has been known since the late thirties and from that time numerous observations have been made, at visible and ultraviolet wavelengths, of interstellar molecular absorption lines in the ...
Smith, Colin Adrian
core   +1 more source

Formation of Carbon Monophosphide in Interstellar Environments through the C(3P) + PH(3Σ−) and P(4S) + CH(2Π) Reactions

The Astrophysical Journal
Phosphorus is essential for life, forming the backbones of DNA and RNA, fueling metabolism through ATP, supporting cell membranes, and contributing to bone structure.
Alexandre C. R. Gomes, Jing Li, António J. C. Varandas, Breno R. L. Galvão   +3 more
doaj   +1 more source

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, Volume 111, Issue 9, Page 4015-4040, 1 September 2026.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

Photoabsorption and photodissociation of molecules important in the interstellar medium [PDF]

, 1991
The photoabsorption, photodissociation, and fluorescence cross sections of interstellar molecules are measured at 90 to 250 nm. These quantitative optical data are needed for the understanding of the formation and destruction processes of molecules under
Lee, Long C., Suto, Masako
core  

Considerations Regarding Cometary and Interstellar Molecules. [PDF]

The Astrophysical Journal, 1942
The visual continua in the spectra of three nebulae photographed with a narrow slit are not produced by the blending of atomic emission lines but must have a physical origin. Several strong He I emission lines just beyond the Balmer limit may tend to vitiate measurements of the intensity distribution in the Balmer continuum on plates taken with a wide ...
openaire   +2 more sources

Report on Current Data and uses of Interstellar Molecules [PDF]

, 1977
The problem presented by polyatomic molecules in interstellar space were first suggested by the detection of CN, CH, and CH+ just before 1940; but it was not until the discovery of radio emission from NH3 in 1968 that radio observatories began to devote ...
Hillegas, Joe
core   +1 more source

Quantum mechanical modeling of interstellar molecules on cosmic dusts: H₂O, NH₃, and CO₂. [PDF]

Front Chem, 2022
Li F, Quan D, Zhang X, Li X, Esimbek J.
europepmc   +1 more source