the oxidation of n-pentanol by tetramethylammonium fluorochromate in acidic solution wasstudied using spectrophotometric technique. the reaction was arranged to be under pseudo firstorderconditions respect to the oxidant. a michaelis-menten type kinetic was observed respect tothe substrate. the reaction is catalyzed by hydrogen ions. dependences of the reaction rates ontemperature and different...

In ultrasonic tube hydroforming, the tube is hydro formed while the ultrasonic vibration is applied to the die. Prior studies provide experimental proof that ultrasonic tube hydroforming reduces corner radius, improves lubrication and uniform thickness. Use of ultrasonic vibration can decrease friction at the tube-die interface. Few attempts have been made to analyze the wire drawing while the ...

Object manipulation techniques in robotics can be categorized in two major groups including manipulation with and without grasp. The aim of this paper is to develop an object manipulation method where in addition to being grasp-less, the manipulation task is done in a passive approach. In this method, linear and angular positions of the object are changed and its manipulation path is controlled...

The catalytic highly regio-, diastereo-, and enantioselective synthesis of a small library of spiropyrrolizidineoxindolesvia a four-component 1,3-dipolar cycloaddition reaction of azomethine ylides, derived from isatin, with electron-deficient dipolarophilewas described. The process occurs at room temperature in aqueous ethanol as a green solvent and in the presence of a bidendatebis(imine)–Cu(...

The reaction mechanism of cytosine deaminase from Escherichia coli is studied using density functional theory. This zinc-dependent enzyme catalyzes the deamination of cytosine to form uracil and ammonia. The calculations give a detailed description of the catalytic mechanism and establish the role of important active-site residues. It is shown that Glu217 is essential for the initial deprotonat...

The main purpose of key distribution is to provide efficient and effective security to commence with security providing schema in view of smart devices in IOT generally focalize on cryptographic method. In established usage of key distribution mechanism in real-time system services, it is most often deficient to build multiple channels with strong security simultaneously on a single data server...