Results 91 to 100 of about 11,557,211 (324)

Extending El Sayed's Rule by 1(n,π*)–3(n,π*) Rotation via Intramolecular Secondary Interaction Enables Room‐Temperature Circularly Polarized Phosphorescence in Solution

Angewandte Chemie, EarlyView.
Weak but skilled: Our results highlight the crucial role of intramolecular secondary interactions to induce an efficient ISC between formally identical 1(n,π*) and 3(n,π*) states in chiral thionated phthalimide derivatives. This unprecedented type of inter‐system crossing (ISC) extends the usual thinking of the El‐Sayed principle and enables the ...
Oscar Charpentier, Marie Guesdon, Catherine Demangeat, Maher Hojorat, Joseph Young, Emrys W. Evans, Vincent Dorcet, Nicolas Galland, Denis Jacquemin, Ludovic Favereau   +9 more
wiley   +1 more source

Impact of meridional winds on the development of equatorial plasma bubbles: a review

Frontiers in Astronomy and Space Sciences
The impact of meridional winds on the onset and evolution of equatorial plasma bubbles (EPBs) is reviewed. The conventional wisdom had been that transequatorial meridional winds have a stabilizing effect on the development of EPBs during equatorial ...
J. D. Huba
doaj   +1 more source

KETIDAKTERATURAN LAPISAN IONOSFER DAN KAITANNYA DENGAN PROSES-PROSES KOPLING ATMOSFER-IONOSFER INDONESIA [IONOSPHERIC IRREGULARITIES AND ITS RELATION TO COUPLING PROCESS OF ATMOSPHERE-IONOSPHERE OVER INDONESIA] [PDF]

, 2012
Ketidakteraturan ataupun ketidakstabilan plasma di lapisan ionosfer perlu dijelaskan mekanismenya sehingga akan bermanfaat dalam pembangunan maupun pengembangan model lapisan ionosfer. Dengan memanfaatkan teknologi penginderaan jauh, dalam hal ini adalah
Dyah Rahayu Martiningrum, Martiningrum, Dyah Rahayu   +1 more
core  

A minimum in the latitude variation of spread-F at March equinox

Progress in Earth and Planetary Science, 2018
This short paper presents the statistics of spread-F occurrence at four low-mid latitude locations (17.0° N, 21.2° N, 26.5° N and 36.5° N mag. lat.) in Japan longitude sector (~ 135° E) in March to April 2002, 2003 and 2006 (high, medium and low solar ...
N. Balan, T. Maruyama, A. K. Patra, V. L. Narayanan   +3 more
doaj   +1 more source

Equatorial E and F Region scattering structures over Jicamarca [PDF]

, 1993
During the IGY, from December 1957 to November 1958, Trans-equatorial, 50 MHz forward scatter propagation studies were carried out in Perú by the National Bureau of Standards. They had different propagation paths.
Woodman Pollitt, Ronald Francisco
core  

Ionization hole campaign—a coordinated rocket and ground-based study at the onset of equatorial spread-F: first results

, 1997
A comprehensive multi-technique campaign involving the launch of two high altitude RH-560 rockets was carried out from Sriharikota (SHAR), India, a near-equatorial rocket launching station at the onset of equatorial spread-F, along with a host of ground ...
Misra, R. N., A.D. Danilov, Raizada, Shika, H.S.S. Sinha, Narayanan, R., S.R. Das, R. Raghavarao, V.V. Babu, Somayajulu, V. V., Raghavarao, R., R.N. Misra, Shika Raizada, Sekar, R., Das, S. R., Sridharan, R., Ramarao, P. V. S., Babu, V. V., P.B. Rao, G.D. Vyas, Pallam Raju, D., V.V. Somayajulu, Vyas, G. D., R. Narayanan, Danilov, A. D., R. Sridharan, Sinha, H. S. S., Chandra, H., Rao, P. B., H. Chandra, D.Pallam Raju, R. Sekar, P.V.S. Ramarao   +31 more
core   +1 more source

Investigation of the possible relationship between the occurrences of atmospheric gravity waves and equatorial Spread-F. [PDF]

Heliyon, 2023
Olawepo AO, Olagunju OE, Ajani OV.
europepmc   +1 more source

Effect of geomagnetic activity on equatorial radio VHF scintillations and spread F

, 1981
The paper discusses the occurrence of scintillations of ATS 3 (137 MHz) beacons recorded at Huancayo on geomagnetically quiet and disturbed days during the years 1969-1976 and compares the results with the corresponding occurrence of range and frequency ...
Mullen, J. P., R. G. Rastogi, Rastogi, R. G., MacKenzie, E., E. MacKenzie, J. P. Mullen   +5 more
core   +1 more source

Discovery of the Cyclic Form of MRI pH‐Sensor Z‐OMPD Enables >5% 13C Hyperpolarization by SABRE

Angewandte Chemie International Edition, EarlyView.
With “c‐OMPD”, we discovered a previously unknown 5‐membered lactol structure that arises from the homoaldol condensation of the central metabolite pyruvic acid. We demonstrate that the cyclization equilibrium is of crucial importance for OMPD's function as MRI‐based pH sensor and achieve for the first time 13C polarization levels (>5%) by SABRE in the
Juanita Ferreira, Ivan A. Trofimov, Martin Grashei, Adriana Sacristán‐Martín, Alexander Huber, David Schleicher, Oleksiy Khavryuchenko, Franz Schilling, Andreas B. Schmidt, Max von Delius   +9 more
wiley   +1 more source

The Statistics of Equatorial Spread-F and Effects on Critical Frequency at Chumphon, Thailand

, 2020
This work presents the study of equatorial spread-F (ESF) characteristics based on the occurrence percentages and durations during the maximum solar activity of the 24 solar cycle at Chumphon station (CPN), Thailand.
P. Thammavongsy, P. Supnithi, W. Phakphisut, K. Hozumi, T. Tsugawa, Kallaya Bannop   +5 more
semanticscholar   +1 more source