URAT: astrometric requirements and design history

The U.S. Naval Observatory Robotic Astrometric Telescope (URAT) project aims at a highly accurate (5 mas), ground-based, all-sky survey. Requirements are presented for the optics and telescope for this 0.85 m aperture, 4.5 degree diameter field-of-view, specialized instrument, which are close to the capability of the industry. The history of the design process is presented as well as astrometric performance evaluations of the toleranced, optical design, with expected wavefront errors included.Comment: 12 pages, 7 figures, SPIE 2006 Orlando conf. proc. Vol. 626

Guided Bone Regeneration with Application of Titanium Membrane (Clinical experience)

U implantologiji i parodontologiji se u svrhu kontrole regeneracije koštanoga tkiva rabe resorptivne i neresorptivne membrane.U ovome radu prikazana su iskustva dobivena uporabom neresorptivne titan neperforirane membrane. U slučajevima velikih koštanih defekata s namjerom ugradnje usadaka “Paraplant 2000” simultano smo upotrebljavali titan membrane kako bi se dobio koštani volumen odmah nakon ugradnje usadka u defekt. Fiksacija titan membrane provedena je s pomoću “Currasan” seta. Kod obrađenih i prikazanih slučajeva ustanovili smo opsežnu koštanu regeneraciju nakon 75 dana. Time i opravdanost uporabe titan membrane.Resorbable and non-resorbable membranes are used in implantology and periodontology for guided bone regeneration. This paper shows experience that has been gained from using non-resorbable titanium non-perforated membrane. In case of large bone defects with intention to place an implant “Paraplant 2000” we simultaneously use titanium membrane for building up bone volume immediately after positioning implant into the defect. Fixation of titanium membrane has been performed with “Currasan” fixation set. In the processed and presented cases we have determined significant volume of bone regeneration after 75 days which validate application of titanium membrane

Convection-permitting fully coupled WRF-Hydro ensemble simulations in high mountain environment: impact of boundary layer- and lateral flow parameterizations on land–atmosphere interactions

Numerical climate models have been upgraded by the improved description of terrestrial hydrological processes across different scales. The goal of this study is to explore the role of terrestrial hydrological processes on land–atmosphere interactions within the context of modeling uncertainties related to model physics parameterization. The models applied are the Weather Research and Forecasting (WRF) model and its coupled hydrological modeling system WRF-Hydro, which depicts the lateral terrestrial hydrological processes and further allows their feedback to the atmosphere. We conducted convection-permitting simulations (3 km) over the Heihe River Basin in Northwest China for the period 2008–2010, and particularly focused on its upper reach area of complex high mountains. In order to account for the modeling uncertainties associated with model physics parameterization, an ensemble of simulations is generated by varying the planetary boundary layer (PBL) schemes. We embedded the fully three-dimensional atmospheric water tagging method in both WRF and WRF-Hydro for quantifying the strength of land–atmosphere interactions. The impact of PBL parameterization on land–atmosphere interactions is evaluated through its direct effect on vertical mixing. Results suggest that enabled lateral terrestrial flow in WRF-Hydro distinctly increases soil moisture and evapotranspiration near the surface in the high mountains, thereby modifies the atmospheric condition regardless of the applied PBL scheme. The local precipitation recycling ratio in the study area increases from 1.52 to 1.9% due to the description of lateral terrestrial flow, and such positive feedback processes are irrespective of the modeling variability caused by PBL parameterizations. This study highlights the non-negligible contribution of lateral terrestrial flow to local precipitation recycling, indicating the potential of the fully coupled modeling in land–atmosphere interactions research

Immediate Strain on “Centerpuls” Implants Supported With Resilient Supra-Construction “Paraplant 2000” (Clinical experience)

Rješavanje slučajeva bezubosti donje čeljusti nerijetko je velik problem.Klasično protetsko rješenje obično ne zadovoljava. U rješavanju takvih slučajeva upotrijebili smo “Centerpuls” usadke u kombinaciji s rezilijentnom suprakonstrukcijom “Paraplant 2000”. Neposredno nakon ugradnje izvršili smo mjerenje stabilnosti usadka. Nakon što smo ustanovili da je koeficijent stabilnosti zadovoljavajući, “Centerpuls” usadke podržane rezilijentnom suprakonstrukcijom “Paraplant 2000” odmah smo opteretili već prije pripremljenim protetskim radom. Provodili smo redovite kontrole stabilnosti usadka. Ovaj rad prikazuje vlastita iskustva i kazuistiku.Resolving cases with an edentulous lower jaw often represents a huge problem. Classic solution usually do not offer satisfaction. In resolving such cases we have applied “Centerpuls” implants in combination with “Paraplant 2000” resilient supra-construction. Immediately after implantation we performed implant stability measuring. Immediately after determining that implant stability quotient is sufficient, we placed previously prepared dentures on “Centerpuls” implants supported with “Paraplant 2000” resilient supra-construction. We performed regular controls. This paper is about related clinical experience an casuistic

On the Non-invasive Measurement of the Intrinsic Quantum Hall Effect

With a model calculation, we demonstrate that a non-invasive measurement of intrinsic quantum Hall effect defined by the local chemical potential in a ballistic quantum wire can be achieved with the aid of a pair of voltage leads which are separated by potential barriers from the wire. B\"uttiker's formula is used to determine the chemical potential being measured and is shown to reduce exactly to the local chemical potential in the limit of strong potential confinement in the voltage leads. Conditions for quantisation of Hall resistance and measuring local chemical potential are given.Comment: 16 pages LaTex, 2 post-script figures available on reques

Target specificity among canonical nuclear poly(A) polymerases in plants modulates organ growth and pathogen response

Polyadenylation of pre-mRNAs is critical for efficient nuclear export, stability, and translation of the mature mRNAs, and thus for gene expression. The bulk of pre-mRNAs are processed by canonical nuclear poly(A) polymerase (PAPS). Both vertebrate and higher-plant genomes encode more than one isoform of this enzyme, and these are coexpressed in different tissues. However, in neither case is it known whether the isoforms fulfill different functions or polyadenylate distinct subsets of pre-mRNAs. Here we show that the three canonical nuclear PAPS isoforms in Arabidopsis are functionally specialized owing to their evolutionarily divergent C-terminal domains. A strong loss-of-function mutation in PAPS1 causes a male gametophytic defect, whereas a weak allele leads to reduced leaf growth that results in part from a constitutive pathogen response. By contrast, plants lacking both PAPS2 and PAPS4 function are viable with wild-type leaf growth. Polyadenylation of SMALL AUXIN UP RNA (SAUR) mRNAs depends specifically on PAPS1 function. The resulting reduction in SAUR activity in paps1 mutants contributes to their reduced leaf growth, providing a causal link between polyadenylation of specific pre-mRNAs by a particular PAPS isoform and plant growth. This suggests the existence of an additional layer of regulation in plant and possibly vertebrate gene expression, whereby the relative activities of canonical nuclear PAPS isoforms control de novo synthesized poly(A) tail length and hence expression of specific subsets of mRNAs