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Asociația Ad Astra a anunțat câștigătorii Premiilor Ad Astra 2022: http://premii.ad-astra.ro/. Proiectul și-a propus identificarea și popularizarea modelelor de succes, a rezultatelor excepționale ale cercetătorilor români din țară și din afara ei.
Publicatii proprii
Synthesis of 4-Azulen-1-yl-pyrylium Salts 2- and 6-Substituted with either Naphthyls or Naphthyl and Phenyl Groups
New 4-azulen-1-yl-pyrylium salts 2- and 6-substituted with either naphthyls or naphthyl and phenyl groups were obtained and characterized. The dyes were obtained by the reaction of the corresponding 4-pyrones with azulenes in the presence of POCl3. The starting pyrones were prepared by the cyclization of either 1,5-diaryl-1,3,5-triketones or 1-hydroxy-1,5-diaryl-pent-1-en-4-yn-3-ones. The possibility that the obtained pyrylium salts to interact with
Read moreImprovement of stepped frequency continuous wave ground penetrating radar cross range resolution,
This paper presents some experimental results obtained with newly developed stepped-frequency continuous wave (SFCW) ground-penetrating radar in a frequency range from 400 to 4845 MHz. This paper describes the procedures to remove the delays within the transmitter, the receiver, and the antenna system and analyzes the experimental results obtained after processing the measured data. The measured system footprint and the experimental results show
Read moreSuperior Modes in High Permittivity Cylindrical Dielectric Resonator Antenna Excited by a Central Rectangular Slot
High permittivity materials allow good miniaturization of microwave components, but the dielectric resonator antenna using these materials has the drawback of a reduced bandwidth. To overcome this disadvantage we wanted to obtain a relatively wideband high permittivity DRA using the superior modes. Using HFSS simulations, we identified some of the superior modes that appear in cylindrical DRAs situated on a conductor ground plane and excited by a
Read moreRomania‘s Airlines and Airports during Transition with Particular Reference to the West Region
Air transport has been one of the most dynamic branches of the Romanian economy in recent years. After slow progress in the 1990s when there were many years of negative economic growth, the years of relative prosperity in the run-up to EU accession in 2007 have boosted passenger numbers, along with the availability of economy fares linked with the rise of low-cost airlines. The paper provides first an introduction to Romanian aviation and proceeds
Read moreIntraplatelet oxidative/nitrative stress: inductors, consequences, and control.
This article provides an overview of the current knowledge on intraplatelet oxidative/nitrative stress, an abnormality associated with platelet activation and hyper-reactivity. The first issue discussed is related to induction of platelet endogenous stress by the molecules present within the circulating (extracellular) milieu that bathes these cells. The second issue concerns the intraplatelet oxidative/nitrative stress associated with specific pathologies
Read moreFerritin above 100 mcg/L could rule out colon cancer, but not gastric or rectal cancer in patients with involuntary weight loss
Background A tenth of patients with involuntary weight loss (IWL) have gastrointestinal cancer. Ferritin is the first parameter to be modified during the process leading to iron deficiency anaemia, therefore it should be the most sensitive. The aim of this study was to assess the ability of ferritin to rule out gastrointestinal cancer in patients with involuntary weight loss. Methods All consecutive patients with IWL admitted in a secondary care
Read moreTranscriptional plasticity of a soil arthropod across different ecological conditions
Ecological functional genomics, dealing with the responses of organisms to their natural environment is confronted with a complex pattern of variation and a large number of confounding environmental factors. For gene expression studies to provide meaningful information on conditions deviating from normal, a baseline or normal operating range (NOR) response needs to be established which indicates how an organism's transcriptome reacts to naturally
Read moreEfficiently learning the preferences of people
This paper presents a framework for optimizing the preference learning process. In many real-world applications in which preference learning is involved the available training data is scarce and obtaining labeled training data is expensive. Fortunately in many of the preference learning situations data is available from multiple subjects. We use the multitask formalism to enhance the individual training data by making use of the preference information
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