Equation of state and transport processes in self--similar spheres

We study the effect of transport processes (diffusion and free--streaming) on a collapsing spherically symmetric distribution of matter in a self--similar space--time. A very simple solution shows interesting features when it is matched with the Vaidya exterior solution. In the mixed case (diffusion and free--streaming), we find a barotropic equation of state in the stationary regime. In the diffusion approximation the gravitational potential at the surface is always constant; if we perturb the stationary state, the system is very stable, recovering the barotropic equation of state as time progresses. In the free--streaming case the self--similar evolution is stationary but with a non--barotropic equation of state.Comment: 9 pages, 2 figure

Strategi Pengembangan Objek Wisata Air Panas di Desa Marobo, Kabupaten Bobonaro, Timor Leste

The tourism is a new type of industry which able to bring up economic growth rapidly in providing jop opportunity, increasing income, living standard, and estimulate another productive sectors. When the object of hot spring is well developed, it can lift up the national income and local revenue in order to improve the welfare and prosperity of society. This study aimed to analyze the tourism development strategy of hot spring in Marobo village, of Bobonaro District. This study used 10 people a sample from government, community leaders and businessmen. Data were collected by conducting interviews and questionnaires. Subsequently collected data were analyzed by using descriptive analysis and SWOT analysis as well as internal and external matrix (IE). The result of this study showed that the analysis of the external environment, obtained a value of 3.91 and internal environment of 3:03. So the adequate development strategy can be applied is tourism development such as in the period Merry Christmas and New Year Day with competite price and more varied so as to meet the target. Tourism development can be done by diversifying tourism objects and system modifications so enable tourists to have travel easily. The result of the study as mentioned above reminds all relevant parties to have serious attention on the development of Marobo hot spring. In order to make the tourism object as modern and attractive destination, it is advised to all relevant parties to upgrade the cooperation with Travel Agencies and Investors in providing the widely opportunities tho the development of the tourism object. In addition, it is necessary to advice to government to recruit employees who are espesialized in the are of tourism. It is important to advice also the government at Municipality level in particularly The Official Tourism and Culture of Bobonaro to be able to activate the website optimally on potential attractions of Marobo Hot Spring

Irrigação por bacias em nível na cultura da bananeira.

Descrição do sistema de irrigação; Vantagens, desvantagens e adaptabilidade; Bases para o dimensionamento; Operação e manejo do sistema de irrigação; Considerações sobre a exploração comercial da bananeira irrigada por bacias em nível.bitstream/item/71927/1/CPAMN-CIR.-TEC.-04-92.pd

Fabry Perot Halpha Observations of the Barred Spiral NGC 3367

We report the gross properties of the velocity field of the barred spiral galaxy NGC 3367. The following values were found: inclination with respect to the plane of the sky, i=30 deg; position angle (PA) of receding semi major axis PA=51 and systemic velocity V(sys)=3032 km/s. Large velocity dispersion are observed of upt o 120 km/s in the nuclear region, of up to 70 km/s near the eastern bright sources just beyond the edge of the stellar bar where three spiral arms seem to start and in the western bright sources at about 10 kpc. Deviations from normal circular velocities are observed from all the disk but mainly from the semi circle formed by the string of south western Halpha sources. An estimate of the dynamical mass is M(dyn)=2x10^11 Msolar.Comment: Accepted to be published in May 2001 issue in the A.J. 19 pages, 7 figure

The Weibull-Geometric distribution

In this paper we introduce, for the first time, the Weibull-Geometric distribution which generalizes the exponential-geometric distribution proposed by Adamidis and Loukas (1998). The hazard function of the last distribution is monotone decreasing but the hazard function of the new distribution can take more general forms. Unlike the Weibull distribution, the proposed distribution is useful for modeling unimodal failure rates. We derive the cumulative distribution and hazard functions, the density of the order statistics and calculate expressions for its moments and for the moments of the order statistics. We give expressions for the R\'enyi and Shannon entropies. The maximum likelihood estimation procedure is discussed and an algorithm EM (Dempster et al., 1977; McLachlan and Krishnan, 1997) is provided for estimating the parameters. We obtain the information matrix and discuss inference. Applications to real data sets are given to show the flexibility and potentiality of the proposed distribution