Data Warehouses have increasingly become important in organizations that have large amount of dat... more Data Warehouses have increasingly become important in organizations that have large amount of data. It is not a product but a part of a solution for the decision support system in those organizations. Data model is the starting point for designing and developing of data warehouses architectures. Thus, the data model needs stable interfaces and consistent for a longer period of time. The aim of this research is to know which data model in data warehousing has the best performance. The research method is descriptive analysis, which has 3 main tasks, such as data collection and organization, analysis of data and interpretation of data. The result of this research is discussed in a statistic analysis method, represents that there is no statistical difference among data models used in data warehousing. The organization can utilize four data model proposed when designing and developing data warehouse.
We investigated the relaxation of electronically excited nitro aromatic compounds, in particular ... more We investigated the relaxation of electronically excited nitro aromatic compounds, in particular 3,5-dinitroanisole (3,5-DINA), by means of picosecond and nanosecond laser kinetic spectroscopy. Complete neglect of differential overlap/spectroscopic—configuration interaction calculations were performed to characterize their excited states. The gas phase UV spectrum of 3,5-DINA and the electron spin resonance spectrum of the anion serve the same purpose. It is shown by means of IR spectroscopy that 3,5-DINA in its ground state does not form hydrogen bonds. The envelope of the first absorption band of 3,5-DINA in liquid solutions covers a weak nπ* and a strong ππ* transition. In non-hydrogen-bonding solvents, excitation in this band populates a primary excited state Si which decays within 10 ps to S0 and to T0. The state T0 (in CH3CN) is converted within 780 ps to S0. In hydrogen bonding solvents the decay is quite different. The conversion T0 → S0 and probably Si → S0 is much slower, ...
Data Warehouses have increasingly become important in organizations that have large amount of dat... more Data Warehouses have increasingly become important in organizations that have large amount of data. It is not a product but a part of a solution for the decision support system in those organizations. Data model is the starting point for designing and developing of data warehouses architectures. Thus, the data model needs stable interfaces and consistent for a longer period of time. The aim of this research is to know which data model in data warehousing has the best performance. The research method is descriptive analysis, which has 3 main tasks, such as data collection and organization, analysis of data and interpretation of data. The result of this research is discussed in a statistic analysis method, represents that there is no statistical difference among data models used in data warehousing. The organization can utilize four data model proposed when designing and developing data warehouse.
We investigated the relaxation of electronically excited nitro aromatic compounds, in particular ... more We investigated the relaxation of electronically excited nitro aromatic compounds, in particular 3,5-dinitroanisole (3,5-DINA), by means of picosecond and nanosecond laser kinetic spectroscopy. Complete neglect of differential overlap/spectroscopic—configuration interaction calculations were performed to characterize their excited states. The gas phase UV spectrum of 3,5-DINA and the electron spin resonance spectrum of the anion serve the same purpose. It is shown by means of IR spectroscopy that 3,5-DINA in its ground state does not form hydrogen bonds. The envelope of the first absorption band of 3,5-DINA in liquid solutions covers a weak nπ* and a strong ππ* transition. In non-hydrogen-bonding solvents, excitation in this band populates a primary excited state Si which decays within 10 ps to S0 and to T0. The state T0 (in CH3CN) is converted within 780 ps to S0. In hydrogen bonding solvents the decay is quite different. The conversion T0 → S0 and probably Si → S0 is much slower, ...
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Papers by JP Zwart