The Secchi disk is a circular white disk that is lowered into a natural body of water by a human observer until it disappears from view. The depth of disappearance is a visual measure of the clarity of the water. This review examines the physical and physiological basis of the Secchi disk procedure. The theory of the white disk is detailed to show the underlying assumptions and the consequent s...

OBJECTIVE To correlate spinopelvic balance with the development of degenerative spondylolisthesis and disk herniation. METHODS This was a descriptive retrospective study that evaluated 60 patients in this hospital, 30 patients with degenerative spondylolisthesis at the L4-L5 level and 30 with herniated disk at the L4-L5 level, all of whom underwent Surgical treatment. RESULTS Patients with ...

Recent X-ray observations have shown broad, skewed iron line emission from Seyfert 1 galaxies which is explained by the emission being fluorescence on a disk close to a black hole. During one interval, the line in MCG–6-30-15 was so broad and redshifted that a Kerr black hole is implied. We are therefore studying the effects of the Kerr metric on the line profile, and extending the work by Laor...

Side-shift and disk-steer implement guidance systems were tested for differences in performance during cultivation on fields with 0 and 5% side slope. Test speeds were slow (4.8 km/h, 3 mph) and medium (8.0 km/h, 5 mph). Test path shapes included a tractor ramp, implement ramp, sine and curve. Performance measures included tractor positional error, implement positional error, torque from side f...

We report the first detection of molecule cyanomethyl, CH$_2$CN, in a protoplanetary disk. Until now, CH$_2$CN had only been observed at earlier evolutionary stages, giant molecular clouds TMC-1 and Sgr 2, prestellar core L1544. detect six transitions ortho-CH$_2$CN towards disk around nearby T Tauri star TW Hya. An excitation analysis reveals that disk-averaged column density, $N$, for is $(6....

We present a complete FIR spectral energy distribution of a normal spiral disk. A full grating scan, from 43–189 μm, centered on the nucleus of NGC 4414 was made with the ISO Long Wavelength Spectrometer (LWS). The midIR to millimeter continuum of NGC 4414 can be modeled with thermal dust emission from a warm component at 69 K and a cool component at 24.5 K. At a distance of 9.6 Mpc, the LWS be...

The involvement of vascular fibroblasts (FBs) and smooth muscle (SM)-like cells in physiological and pathological processes in large vessels (intimal hyperplasia) and microvessels (capillary arterialization), and the realization that these cells are exposed to interstitial flow shear stress (SS), motivate this study of SS on FB migratory activity. Rat adventitial FBs were grown to either 30-50%...

We present the first spectroscopically resolved H? emission map of Large Magellanic Cloud's (LMC) galactic wind. By combining new Wisconsin H-alpha Mapper observations (IH? ? 10 mR) with existing H i 21 cm observations, we (1) mapped LMC's nearside wind over a local standard rest (LSR) velocity range +50 ? vLSR +250 km s?1, (2) determined its morphology and extent, (3) estimated mass, outflow r...

We investigated dusty and dust-free gas dynamics for a radiation-driven sub-pc scale outflow in an active galactic nucleus (AGN) associated with supermassive black hole $10^7 M_\odot$ bolometric luminosity $10^{44}$ erg s$^{-1}$ based on the two-dimensional radiation-hydrodynamic simulations. A ``lotus-like'' multi-shell is launched from inner part ($r \lesssim 0.04$ pc) of geometrically thin d...