Abstract In order to optimize the water supply system for various operation models, this study uses a hilly project as an example. analyze network optimization, two objective functions: cost and dependability. The designer can then select best optimization strategy his needs. design of real-world network, component in seaside town China, was done using methodology. Based on findings, it is cruc...

abstract regarding temporal variation of rivers discharge and demands, for suitable use of dam reservoirs stored water, application of operation rule curves is necessary. operation rules are expressed with rule curves. application of yield model is one of the methods of operation curve preparation, which correlates reservoir operation with reservoir storage volume in first period. in this study...

a facile and efficient method for the preparation of 1,1-diacetates of aldehydes is improved. the acidified kaolin with sulfuric acid (2 % w/w) catalyzed 1,1-diacetates formation from aldehydes in solvent-free conditions. both aromatic and aliphatic aldehydes gave high yields (85-95 %) of the corresponding 1, 1-diacetates. advantages of this method are the use of inexpensive and selective catal...

background: musculoskeletal disorders (msds) are one of the most common causes of occupational injuries that appear mainly in back, neck and upper limb. this study was conducted with the objectives of determination of prevalence rate of msds among workers of a generator manufacturing company and ergonomics assessment of working conditions. methods: in this study, 319 workers randomly selected p...

a simple, clean, and environmentally benign three-component process for the synthesis of 2-amino-4hchromenes using [mim]cl, as an efficient catalyst under solvent-free conditions are described. a wide range of aromatic aldehydes easily undergoes condensations with 1-naphthol and malononitrile under solvent-free conditions to afford the desired products of good purity in excellent yields. taking...

High rates of mental health conditions and unemployment are significant problems facing Veterans of Operation Iraqi Freedom/Operation Enduring Freedom (OIF/OEF). We examined two national Veterans Health Administration (VHA) databases from fiscal years 2008-2009: a larger database (n = 75,607) of OIF/OEF Veterans with posttraumatic stress disorder, depression, substance use disorder, or traumati...

This paper makes use of a vertical integration model to explain virtual enterprises, analyses respective characteristics of virtual operation and internal integration, probes into the correlative factors of virtual operation. The paper points out that virtual operation and internal integration are two parallel ways which enterprises may choose to expand their organization. Virtual operation urg...

Background: The post-harvesting process of medicinal plants such as drying operation and storage conditions has great influence on their quality and quantity of the active ingredients. Objective: The aim of this experiment was to investigate the effect of pre-drying operation and also storage conditions and duration on the essential oil content and composition of Thymus daenensis. Methods: A ...

in this research the simulation of an air independent proton exchange membrane fuel cell (pemfc) propulsion system was taken into consideration. the system consists of several parts including pem fuel cell stack, metal hydride and liquid oxygen (lox) tanks, and also pre-heaters of oxygen and hydrogen gases along with other heat exchangers, to ensure proper operation of system. the heat recovery...