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Publicatii proprii
A version of biting lemma for unbounded sequences in L1 with applications
The aim of the present work is to introduce the notion of finite tightness and then to obtain some results of compactness in the lack of L1 - boundedness.We use these results in order to obtain information about the limit of the solutions for a sequence of one dimensional heat equations.
Read moreFinite-tight sets
We introduce two notions of tightness for a set of measurable functions - the finite-tightness and the Jordan finite-tightness with the aim to extend certain compactness results (as biting lemma or Saadoune- Valadier's theorem of stable compactness) to the unbounded case. These compactness conditions highlight their utility when we look for some alternatives to Rellich-Kondrachov theorem or relaxed lower semicontinuity of multiple integrals. Finite-tightness
Read morePump energy reduction for a high gain Ag X-ray laser using one long and two short pump pulses
A pump scheme with one long and two short pump pulses is proposed, in a grazing incidence pumping x-ray laser (XRL) configuration. A 360 ps long pulse, prepares a plasma in a low charge state. Then, an initial short pulse ionizes the plasma to an optimal charge state, while the second short pulse induces strong collisional excitation in the gain region. With only 200 mJ of pump energy on target, a compact Ag XRL at 13.9 nm with a gain coefficient
Read moreOptimal algorithm for spray pyrolysis deposition of TiO2 films by using an industrial robot
This paper approaches the optimization of the spray pyrolysis deposition (SPD) using an industrial robot. The purpose is to develop an optimal algorithm for obtaining uniform films on a planar surface. The design objective refers to the uniformity of the film, the aim being to optimize the difference in thickness between two specific points on the sample. The characteristic parameters of the SPD process (the substrate temperature, the height of spraying
Read moreReprogramming to pluripotency is an ancient trait of vertebrate Oct4 and Pou2 proteins.
The evolutionary origins of the gene network underlying cellular pluripotency, a central theme in developmental biology, have yet to be elucidated. In mammals, Oct4 is a factor crucial in the reprogramming of differentiated cells into induced pluripotent stem cells. The Oct4 and Pou2 genes evolved from a POU class V gene ancestor, but it is unknown whether pluripotency induced by Oct4 gene activity is a feature specific to mammals or was already
Read moreEvaluation of four traditional Romanian medicinal plants as wound healing agents
Achillea millefolium L., Hyssopus officinalis L., Equisetum arvense L. and Echinaceea purpurea L,. are four medicinal plants traditonally used in Romania for treatment of skin disorders and wound healing. In order to suport their use for new plant derived products the aim of this study was to evaluate their potential to stimulate the wound healing process. We investigated the four herbal extracts by HPLC-MS for the presence of polyphenolic compounds,
Read moreThe enemy hypothesis: correlates of gall morphology with parasitoid attack rates in two closely related rose cynipid galls
We tested the enemy hypothesis for gall morphology on a model system comprising two Diplolepis rose gall wasp species and their associated parasitoids. The enemy hypothesis predicts both that gall traits will influence parasitoid attack rates within species, and that galls with contrasting morphologies will support different parasitoid communities. This hypothesis is supported by studies at both intraspecific and broader taxonomic levels (i.e. between
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