Potsdam, Univ., Diss., 2001. / Computerdatei im Fernzugriff.

Potsdam, Universiẗat, Diss., 2001.

No description available.

This report is regarding an electrical installation of an alarm system on a post fishing boat called Andromeda. The background of the installation was an earlier and inadequate alarm system that led to a motor failure. The ship was taken out of service and was sold to Björn Magndahl who rebuilt it to a yacht. The project was conducted partly by developing the existing systems, partly by documenting the work by means of electrical blue prints. Except the alarm systems, an installation of the frequency control unit for the bow thruster was installed. The installation was working fine and the outcome of the documentation was handed over in a form of a binder during the test drive of the systems and the assignment was approved.

The symbiotic jellyfish, Cassiopea andromeda (Cnidaria: Scyphozoa) often sit upside-down on the benthic of shallow water regions, with constant pulsation behavior of its umbrella which brought water currents flowing through its oral arms to enhance prey capture and material exchange with surrounding water. However, little is known about the influence of pulsation on its heterotrophic behavior and symbiotic relationship with endosymbiotic zooxathellae. Current study focused on the potential effects of animal size, illumination, diel cycle, prey availability and starvation on the pulsation rates of the jellyfish. Our result revealed that the pulsation rates decreased at larger animal size, absence of prey, prolonged starvation and dark environment, and vice versa. Animals receiving natural light illumination showed significant diel cycle pattern of pulsation in the 24 hr period, which is not observed in the group dark treatment. Meanwhile, we also conducted the clearance rates of the upside-down jellyfish through its ontogenetic growth, and found that the clearance rates significantly increased as they grow. Based on the results obtained from this study, its is likely that the smaller meduae might rely more on the energy provided by the symbiotic algae, and can exhibit more significant habit selecting behavior.

No description available.

The increasing importance of narrow-band radiations is traced in the recent history of radio astronomy. The need for multi-channel spectrometers to observe these radiations is stressed. The theoretical basis of spectral analysis is given with particular emphasis on autocorrelation or interference methods. A twenty-channel radio-frequency spectrometer designed on interference principles has been constructed and found to perform in accordance with its theory of operation. When used in conjunction with a 25-metre telescope and a hydrogen receiver the spectrometer is capable of producing low-noise wideband spectra at high speed. The spectrometer output was recorded on punched cards, and subsequent data processing was by digital methods. A large area including the position of the spiral galaxy M31 was surveyed with the help of the spectrometer. One hundred and forty-three independent spectra of the 21-cm radiation of atomic hydrogen were obtained and are analyzed in terms of area, velocity, and shape. The major axis of the nebula is found to extend about 2.5° either side of the centre, in agreement with the work of van de Hulst, Raimond, and van Woerden (1957). The length of the minor axis, after correction for the effect of the antenna beamwidth, is only 40', a result which indicates a reduction in the inclination (of the plane of the galaxy to the line of sight) from 14.5° to 8.2°. This lower value leads to an upward revision of the optical axial ratio (of galactic thickness to galactic diameter) to 0.2, while maintaining a low ratio (0.07, Schmidt, 1957) for the distribution of atomic hydrogen. A high axial ratio would clear the way for a reinterpretation of the optical velocities of emission nebulae in M31 (Mayall, 1950), which have so far appeared to be in violent contradiction to the radio velocities (van de Hulst et al, 1957). It is suggested that many of these emission objects may lie some distance from the plane of the galaxy. The position angle of M31, as revealed by the spectrometer observations is distinctly less than the 38° established optically. A new value of 33° is proposed and it is suggested that the former value can be accounted for in terms of an increased axial ratio and the observed asymmetries in the light distribution. The velocity of the centre of gravity of M31 has been obtained by summation of all 143 spectra. The result, -295.6±0.4 km/sec with respect to the local standard of rest, is in complete agreement with that found by van de Hulst (ibid). Radial motions of a few km/sec are possible in the outer parts of M31 but their presence has not been established. Many of the spectra have multiple peaks, which may be interpreted in terms of spiral structure. The velocities of certain concentrations of atomic hydrogen are measurable but their positions are not resolved by the antenna beam. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Thesis (Ph.D.)--Ohio University, March, 2004. / Title from PDF t.p. Includes bibliographical references (p. 95-101)

Restoration of the extracted peat bog Soumarský most in the Šumava NP, Czech Republic, started in 2000 with blocking drainage ditches and increasing water table. There were installed 25 boreholes to measure water table fluctuations in monthly intervals. Around each borehole, vegetation record was made. Three specimens of Vaccinium oxycoccos and Andromeda polifolia, as typical peat bog species which disappeared during extraction, were planted. Moreover, seeds of the species were sown. Survivorship of the transplants and seedling emergence were related to the average water table and composition of vegetation around the boreholes. Results of the experiment showed capability of the species to be reintroduced by these ways. The ability to survive after four years was the highest around the water table of -14 cm. The plants mostly died in dry and too wet sites. This experiment shows the absence of species in the extracted peat bog is caused by dispersal, not habitat limitation. Results can be applied in next restoration attempts in this and comparable disturbed peat bogs.

First, the baryonic content of simulated halos of virial masses between 5 x 10^{9} M_{\odot}$ to 5 x 10^{12} M_{\odot}$ in the APOSTLE project is examined in the context of the missing baryon problem. Baryonic particles in APOSTLE can be either stars or gas. Non-star-forming gas, or the circumgalactic medium (CGM) is further classified by temperature into the Cool CGM (CCGM, T < 10^{5} K), or the Warm-Hot CGM (WHCGM, T > 10^{5} K). APOSTLE halos are found to contain less than 60% of the expected mass of baryons (f_{b} = Ω{b}/Ω{m}, M_{b} = f_{b} x M_{200}) within their virial radius. The WHCGM contains 29% ± 10%, the CCGM 12% ± 5%, and the stars and star-forming gas 19% ± 5%. The metal content of the same halos is analyzed, and compared to the total metals produced by the stars within the virial radius. Over two thirds of the produced metals are retained within the halo, with 14% ± 3% in the WHCGM, 13% ± 4% in the CCGM, and 43% ± 9% in the stars and star-forming gas. Next, we focus on the overall distribution of matter within a 3Mpc radius from the Milky Way. Using the trends in APOSTLE volumes, I quantify both the ellipticity and orientation of this spatial distribution using the principal axes of the inertia tensor of the positions of these galaxies. The Zone of Avoidance has little impact on this result, and the short axis is aligned with that of the Supergalactic Plane, and is perpendicular to the vector separating the Milky Way and Andromeda galaxies. APOSTLE local group analogues are found to be similarly anisotropic, and like in the observed Local Group, the minor axis of that distribution is found to be perpendicular to the vector separating the two primaries. The angular momentum of the stellar disk shows weak alignment with the minor axis of the field galaxy distribution. In addition the simulations also suggest that the angular momenta of the two primary dark-matter halos tend to be anti-aligned. Additionally, stellar disks tend to orient themselves in the same direction as their halo. / Graduate