126 research outputs found
Efficient OPA tomography of non-Gaussian states of light
Current advances in nonlinear optics have made it possible to perform a
homodyne-like tomography of an unknown state without highly efficient detectors
or a strong local oscillator. Thereby, a new experimental direction has been
opened into multimode and large-bandwidth quantum optics. An optical parametric
amplifier (OPA) allows us to reconstruct the quadrature distribution of an
unknown state directly from the measured intensity distribution with high
precision. We propose adding a controllable displacement to the standard
scheme, obtaining an improved method applicable even to asymmetric and
non-Gaussian states while significantly increasing estimation accuracy and
lowering the OPA amplification requirement. To demonstrate the power of our
method, we accurately detect the sub-Planck phase-space structure by a
distillable squeezing from the OPA estimates of various non-Gaussian states.
With the improvements, OPA tomography became a generally applicable
loss-tolerant and efficient alternative to OPA-assisted homodyne detection.Comment: 14 pages, 15 figure
A GABAerg és peptiderg rendszerek kölcsönhatásainak morfológiai alapjai a patkány agy lateralis septumában = Morphological basis of interactions between the GABAergic and peptidergic systems in the lateral septal area of the rat brain
NĂ©hány orexigĂ©n Ă©s anorexigĂ©n neuropeptid megoszlását Ă©s denzitásbeli változásait vizsgáltuk normál, Ă©heztetett hĂm, nĹ‘stĂ©ny Ă©s ovariectomizált Wistar patkányok lateralis septumában (LS). A peptid-GABA kölcsönhatásra vonatkozĂł morfolĂłgiai adatokat GFP-GAD-65 transzgĂ©nikus egerek lateralis septumán vĂ©gzett immunfluoreszcens vizsgálatokkal kerestĂĽnk. EredmĂ©nyeink: 1./ Kontroll patkányokban megállapĂtottuk, hogy az egyes neuropeptidek megoszlása eltĂ©rĹ‘ a LS rostrocaudalis tengelye mentĂ©n. 2./ A CART Ă©s NPY axodendritikus, ill. tĂĽskeszinapszisokat lĂ©tesĂtenek, mĂg a gal- Ă©s enk- terminálisok gyakran kĂ©peznek más sejtek körĂĽl pericelluláris kosárszerű kĂ©pleteket. 3./ A transzgĂ©nikus egereken vĂ©gzett immunfluoreszcens Ă©s konfokális mikroszkĂłpos vizsgálatok a fentiekkel összhangban a GAD-GFP (GABAerg) sejteken is hasonlĂł kapcsolatok meglĂ©tĂ©t igazolták. 4./ NĂ©gy hetes rĂ©szleges Ă©hezĂ©s hatására hĂm patkányokban a gal Ă©s NPY rostok denzitása az 1. Ă©s 2. hĂ©ten nĹ‘tt, a 3. hĂ©tre a kontroll Ă©rtĂ©kre csökkent, majd a 4. hĂ©ten ez alá sĂĽllyedt. A leu-enk ezzel ellentĂ©tben hĂ©trĹ‘l-hĂ©tre fokozatos csökkenĂ©st mutatott. 5./ Intakt nĹ‘stĂ©ny Ă©s ovariectomizált patkányok esetĂ©ben az 1 hetes rĂ©szleges Ă©hezĂ©s mindkĂ©t csoportban szignifikánsan növelte az NPY denzitását saját kontrolljához kĂ©pest. Gal esetĂ©ben mind a rĂ©szleges Ă©hezĂ©s, mind az ovariectomia csökkentette a rostok denzitását, mĂg az enk esetĂ©ben az Ă©hezĂ©s csökkentette, viszont az ovariectomia önmagában növelte a denzitást. | We examined the rostrocaudal distribution and density changes of some orexigenic and anorexigenic neuropeptides in the lateral septum (LS) of normal, and food-deprived male, female and ovariectomized Wistar rats. Morphological basis of peptide-GABA interactions were studied in GFP-GAD-65 transgenic mice. Our result: 1./ In normal male rats we established that the distribution of the neuropeptides is diverse along the rostrocaudal axis of the LS. 2./ CART- and NPY-boutons establish mainly axodendritic and axospinous synapses, gal- and enk-fibers very often form pericellular baskets . 3./ Immunofluorescence and confocal microscopic studies on transgenic mice showed similar types of connectivity. 4./ The density changes of gal and NPY were similar after 4 weeks of partial food deprivation in males: it increased during the 1st and 2nd week, decreased to control values by the 3rd week and further decreased after the 4th week. The density of leu-enk was continuously decreasing. 5./ One week partial food deprivation significantly increased the density of NPY-ergic fibers in both intact females and ovariectomized groups as compared to their own controls. Fasted and ovariectomized animals exhibited considerable reduction. In the case of gal both partial food deprivation and ovariectomy reduced the density of fibers, whereas in the case of enk fasting reduced, and ovariectomy alone increased density
Az 1922 és 1980 között megjelent szegedi egyetemi ifjúsági lapok annotált cikkbibliográfiája
Gyermekkor-kutatás interdiszciplináris keretekben = Researching childhood in an interdisciplinary context
A kutatás a gyermekkor Ăşn. Ăşj szociolĂłgiai szemlĂ©letmĂłdjával vizsgálta a gyermeklĂ©t kĂĽlönbözĹ‘ aspektusait. Eszerint ha az emberisĂ©g idĹ‘-Ă©s tĂ©rbeli horizontján vĂ©gigtekintĂĽnk, akkor nem egy mindenhol Ă©s mindenkor Ă©rvĂ©nyes univerzális gyermekkorral találkozunk, hanem egy adott kultĂşrában, közössĂ©gben lĂ©tezĹ‘vel. Ennek Ă©rvĂ©nyesĂtĂ©sĂ©re törekedtĂĽnk a kutatásban. A gyermekkor törtĂ©neti vizsgálata során dualizmus kori gyermeksĂ©g-megközelĂtĂ©sek (veszĂ©lyeztetett gyermekek, az iskolás gyermek) elemzĂ©se törtĂ©nt meg. Hazai viszonylatban elĹ‘ször szĂĽletett ikonográfiai mĂłdszerű vizsgálat az 1950-es Ă©vek gyermekkĂ©pĂ©rĹ‘l. NarratĂv megközelĂtĂ©ssel az Ărott visszaemlĂ©kezĹ‘ szövegek törtĂ©neti felhasználására tettĂĽnk kĂsĂ©rletet. MĂ©lyinterjĂşk narratĂv elemzĂ©sĂ©vel az emlĂ©kezĹ‘k gyermekkorát igyekeztĂĽnk feltárni, az emlĂ©kezetkutatás törtĂ©neti problĂ©máira figyelemmel. A gyermekkor Ăşj szociolĂłgiai megközelĂtĂ©sĂ©re alapozva a gyermeksĂ©g mint kulturálisan változĂł csoport vizsgálatát a pedagĂłgiai etnográfia mĂłdszerĂ©vel, a kulturális antropolĂłgia segĂtsĂ©gĂ©vel vĂ©geztĂĽk (pl. rĂ©sztvevĹ‘ megfigyelĂ©ssel egy szalagavatĂł bál törtĂ©nĂ©seinek elemzĂ©sĂ©t Ă©s roma gyermekek Ă©letĂ©nek mindennapjait). A gyermek-Ă©s ifjĂşkor Ăşj szemlĂ©letű kutatása további hazai Ă©s nemzetközi publikáciĂłkban is tĂĽkrözĹ‘dik. | The research aimed at investigating childhood by employing the new sociological approach. According to this approach of childhood the spatial and historical dimensions of mankind refer to different childhoods in different cultural contexts instead of a universally relevant, childhood. The research attempted to argue for this issue. Researching into the history of childhood covered several constructions of childhood in the Dual Monarchy (children at risk, the emergence of the school child). The research comprised a pioneer work of iconographical analysis of childhood of the 1950s. Another branch of the research attempted to use a narrative approach of analysing written recollections about school life. A narrative analysis of depth interviews attempted to reveal the childhoods of interviewed elderly people in the 1950s and 60s - these latter two historical investigations considered the historical problems of using recollections as historical sources. The emergence of the new sociology of childhood focused on children as culturally, characterised groups. We used this approach in educational ethnograpy by participation observation investigating a school leaving ceremony and cultural anthropology by participation observation in researching the everyday lives of Roma children. A further attempt on renewing research on children is reflected in several publications in Hungary and abroad
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