biodegradation of phenanthrene (phe) was studied in aqueous culture to demonstrate the potential of the mixed culture in degrading high concentration of phe. the experiments were conducted to monitor biodegradation of phenanthrene for duration of 6 days. biodegradation of phe was successfully achieved in low and middle concentration by the isolated mixed culture. a full factorial central compos...

Cutting tests were conducted to medium carbon steel using HSS tools with cutting fluid. The experimental design used was based on response surface methodology (RSM) using a central composite design. Chips were collected at different machining conditions and thickness and microhardness measurements taken and analyzed using “DESIGN EXPERT 7” experimental design software. Mathematical models of th...

background: application of potassium ferrate is a chemical oxidation approach used for water and wastewater treatment. the aim of this study is to apply central composite design (ccd) and response surface methodology (rsm) to optimize potassium ferrate consumption in the treatment of wastewater from carpet industries. methods: samples in this experimental study were collected from wastewater, o...

bacillus subtilis k40b was isolated from rice rhizospheres and its potential for production of xylanase was evaluated using biochemical methods. the gene for xylanase in b. subtilis k40b was amplified, sequenced and assigned to the ncbi genebank. the gene size was estimated to be 563 bp encoding 413 amino acids. comparison of the xylanase gene with reference sequences showed that the xylanase o...

There are many fundamental problems in the design of object-oriented methods that support the development of formal executable models on a system level, and that are suitable for hardware/software co-specification. System level description formalisms should combine concepts expressive enough to model the essentials of a system on the right level of abstraction. This paper reports experiences in...

This report is the second deliverable D7.2 of Work Package WP7 of the HYBRIDGE Project. The main contributions of D7.2 is a review of the concept of observability for hybrid systems and the presentation of a new approach to observability and observer design for hybrid systems. The ...rst part of the report deals with a formal de...nition of hybrid system that is used to present in a uni...ed fr...

Is there a cross-disciplinary design theory and methodology? This special issue includes three contributions from disciplines that are not typical engineering fields where design theories and methodologies have intensively applied and well received. The first paper, titled “Agile Forward-Reverse Requirements Elicitation as a Creative Design Process: a Case Study of Illimitable Space System v2” ...

MUSA is a multi-user authoring system, planned as an application in the Views system. MUSA’s aim is to support concurrent development of ‘products’ being produced by several people cooperatively or by one person alone. The products are documents in a wide sense: articles, books, software, drawings, etc. This article presents the methodology behind MUSA. 1991 Mathematics Subject Classification: ...