The Unseen Face of E-Business Project Development

The purpose of this paper is intent on identify and analyze the unseen factors of successful or failure of e-business project development. The IT managers must take into account both all costs involved in e-business development and all phases (analysis, design, testing, implementation, maintenance and operation) according to principle of project management for software/systems life cycle development. There are many solutions to exceed these factors of failure among could be counted outsourcing, a good project management, involvement of senior management, a real cost estimation etc.Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 zostało dofinansowane ze środków MNiSW w ramach działalności upowszechniającej nauk

Influence of Sintering Temperature on the Structure of the Yttrium Based Phosphor Nanoparticles

Yttrium-based phosphor materials belonging to the class known as garnets have witnessed a strong return with the development of the first white LEDs. Among these materials, yttrium aluminum garnet doped with cerium has become the best known, being successfully used in generating white light, due to its capacity to convert the blue light emitted by a GaN chip. But its use in optoelectronic applications is subject to the achievement of parameters such as: purity of the crystal phase and particles size in the nanoscale range. In this study, we present a modified sol-gel method for the synthesis of yttrium aluminum garnet doped with cerium (YAG:Ce). In the end, heat treatment will be carried out at various temperatures and the effect of sintering temperature on the crystal phase and morphology will be studied. To highlight the phase transition from amorphous to crystalline state, a Rigaku SmartLab X-ray Diffraction System was used. Moreover, by the X-Ray diffraction pattern we evidenced the presence of the intermediate phases such as the main oxides, the metastable phases with perovskite (YAP) and monoclinic (YAM) structure and finally the garnet phase (YAG). The presence of the dopant in the crystalline structure was demonstrated. The microstructure and morphology evolution of the particles were assessed by using the FEI Nova NanoSEM system. Getting garnet phase and particles with spherical and smooth surfaces at the nanoscale range after a sintering treatment at 1100 °C indicates a phosphor applicable in optoelectronics

Comparison of indoor air pollutants concentration in two Romanian classrooms

This paper investigates the air pollutions in space ventilated in two High School classrooms. The analysis consists of comparison of one classroom with hybrid ventilation system and another one stander-by classroom with natural ventilation. Several studies regarding indoor air quality during the experimental campaign have been done for VOC, CO2, CO, other pollutants, keeping monitored for humidity and temperature. The experimental demonstrated that the highest value for CO2 in stander-by classroom is 2691 ppm and in classroom with hybrid ventilation is 1897 ppm, while values for CO are 1.1 / 1.1 ppm and VOC 0.14 / 0.06 ppm, better use hybrid ventilation

Comparison of indoor air pollutants concentration in two Romanian classrooms

This paper investigates the air pollutions in space ventilated in two High School classrooms. The analysis consists of comparison of one classroom with hybrid ventilation system and another one stander-by classroom with natural ventilation. Several studies regarding indoor air quality during the experimental campaign have been done for VOC, CO2, CO, other pollutants, keeping monitored for humidity and temperature. The experimental demonstrated that the highest value for CO2 in stander-by classroom is 2691 ppm and in classroom with hybrid ventilation is 1897 ppm, while values for CO are 1.1 / 1.1 ppm and VOC 0.14 / 0.06 ppm, better use hybrid ventilation