In this paper, estimation of the parameters of a truncated Type I generalized logistic distribution TTIGL(β, α, τ ), when β = 0, is obtained based on a doubly truncated sample of generalized order statistics. This model is introduced by [AL-Angary, Truncated logistic distributions as lifetime models,M.Sc. thesis, Department of Statistics, Faculty of Science, King Abdulaziz University, Jeddah, Kindom of Saudi Arabia,1997] and the finite mixture of TTIGL(β, α, τ ) component model studied by [Ateya,Mixtures of logisticdistributions as life-time models. M.Sc. thesis,Department of Mathematics, Faculty of Science, Assiut University, Assiut, Egypt, 2001] and [AL-Hussaini and Ateya, Maximum likelihood estimations under a mixture of truncated type I generalized logistic components model, J. Stat. Theory Appl. 2(1) (2003), pp. 47–60; AL-Hussaini and Ateya, Bayes estimations under a mixture of truncated type I generalized logistic components model, J. Stat. Theory Appl. 4(2) (2005), pp. 183–208]. The maximum-likelihood andBayes methods are used in the estimation and then we compare these methods by computing the mean squared errors of the estimates in both cases considering orderstatistics and upper record values cases. Also, the Bayesian prediction intervals for the future generalized order statistics are computed based on a one-sample scheme

Titanium metal (Ti) with antibacterial function was successfully developed in the present study by electrodeposition of biomimetic Ca-P coat in simple supersaturated calcium and phosphate solution (SCPS).The electrochemical behavior and corrosion resistance of Ca-P deposited on anodized titanium (AT) has been investigated in SCPS by using electrochemical impedance spectroscopy (EIS). The plate-counting method was used to evaluate the antibacterial performance against Staphylococcus aureus (ATCC6538). In vitro antibacterial activity study indicated a significantly reduced number of bacteria S- aureus on Ca-P/AT plate surface when compared with that on Ti or AT surfaces and the corresponding antibacterial mechanism is discussed. The morphology and chemical structure of different titanium samples were systematically investigated by scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDX). The study confirmed that the antibacterialproperties of the samples were related to chemical composition of sample surface.

The study aims to present new information and illustrations about sulfidic sedimentary rocks in order to provide a better understanding of how the sulfide minerals might have been formed. It also presents detailed information on the major and trace element contents of various sulfide phases hosted within the sediments. The K/T sediments at Gabal Gifata (Weina and Birbaya sections), hold different morphologic patterns of sulfides including tubular burrow fills, flat sulfidic thin bands and films, fossil replacement and fills, as well as disseminated grains and framboids. The sulfide minerals are composed of pyrite, sphalerite and galena with minor greenockite set in a groundmass composed of gypsum and clays with celestite. These sulfide minerals are believed to have originated in reduced bottom-water conditions via sulfate reducing bacteria after rapid burial of organic matter. The sulfide minerals seam to develop through successive stages by segregation, filling and replacement processes in early and intermediate diagenesis. The framboidal pyrite and its associations of fine pyrite crystals were formed in early diagenesis by rapid growth. The sulfide minerals are arranged within the burrow fills in concentric shells. The outer shells are composed of pyrite while the cores are composed mostly of large sphalerite and in some cases with galena. The grain size and crystallinity of the mineral crystals increase inwards through the shells suggesting progressive formation of the sulfides from the margins to the centers. The minerals were crystallized in a sequence: pyrite, sphalerite-galena in early (pyrite) and intermediate (sphalerite-galena) diagenetic stages. The sulfidic thin bands are composed mostly of pyrite with subordinate sphalerite. The preservation of biogenic cells by pyrite within these bands and the survival of pyrite within sphalerite suggest earlier formation of pyrite by replacement of organic matter (in early diagenesis) followed by sphalerite through cavity filling (in intermediate diagenesis). The microprobe analyses of sulfides showed that the pyrite, which occurs close to the sphalerite, displays much higher concentrations of the trace elements Zn and Ni than the pyrite in the outer shells. Distinct chemical differences exist among the different colors of sphalerite. Several observations suggest that benthic conditions during the deposition of black shales were sufficiently O2-depleted as to exclude benthic organisms (anoxic/euxinic), and that a possibly sharp rise in dissolved O2 levels coincided with the onset of the overlying sediments deposition, crossing a critical threshold to dysoxic levels that allowed benthic rise.