Phase‐change alloys are the functional materials at heart of an emerging digital‐storage technology. The GeTe‐Sb 2 Te 3 pseudo‐binary systems, in particular composition Ge Sb 5 (GST), one a handful which meet unique requirements stable amorphous phase, rapid amorphous‐to‐crystalline phase transition, and significant contrasts optical electrical properties between material states. GST can be optimized by doping with p‐block elements, Bi has interesting effects on crystallization kinetics...

This work proposes a novel type of tunable magnetorheological (MR) damper operated based solely on the location permanent magnet incorporated into piston. To create larger damping force variation in comparison with previous model, different design configuration permanent-magnet-based MR (PMMR) is introduced to provide magnetic flux dispersion two circuits by utilizing materials reluctance. After discussing and some advantages newly designed mechanism, principle analyzed through both...

Most recently, a novel concept of tunable magneto-rheological (MR) dampers has been proposed which can be operated by only permanent magnet (PM) movement instead an electromagnetic coil. The damping force variation the PM based MR damper (PMMR damper) is realized magnetization area or flux dispersion, not magnitude input current. Thus, variable PMMR totally different from conventional (CMR damper). In this work, in order to evaluate feasibility on real field applications, investigation...

The noise of a CMOS charge-sensitive preamplifier (CSA) and correlated double sample-and-hold (CDS) circuit matching capacitive source is calculated to analyze the relative portions thermal 1/f noise. In most radiation detector systems, PMOS transistor used as input device because its lower than that NMOS. However, study reduction action CDS in dominant condition, an NMOS deliberately chosen CSA. theoretical minimum number equivalent charge (ENC) can be achieved this system about 1700...

Abstract A magnetorheological (MR) damper is popularly applied for vibration control owing to its fast response and the easy controllability of field-dependent damping force. However, most existing MR dampers developed so far possess design complexity a high manufacturing cost due complicated coil structures. To resolve these drawbacks dampers, novel magnetic circuit positioned separately from piston head with simple structure proposed in this work. As first step, configuration using...

A new impact testing system with an integrated magnetorheological (MR) damper is proposed, and its dynamic characteristics are analyzed. The consists of a velocity generator, mass, test spring, MR damper. In order to tune the dual shock‐wave profile, model was constructed, appropriate design parameters were then determined produce required damping force. Following this, constructed evaluate analysis field‐dependent profiles. experimental results showed that profile can be altered by changing...

This work presents a new concept of fine position control vehicle lift systems used for maintenance services, to facilitate specialized tasks such as height balancing tilted vehicles. The research goal is accomplished by utilizing controllable hydraulic circuit associated with magnetorheological valves. After establishing the required dynamic forces and range vehicle’s system, two-coil type valve designed consideration field-dependent properties fluid magnetic flux intensity, which analyzed...

A passive neutron coincidence counter for nuclear material measurement of the advanced spent fuel conditioning process (ACP) has been developed by Korea Atomic Energy Research Institute (KAERI) since 2003 and was deployed in a hot cell ACP Facility (ACPF) 2005. The most dominant source among spontaneous fission nuclides contained is 244Cm. To obtain counting rates singles, doubles, triples coincidences with an increment 244Cm mass, test performed 2007 several rod-cuts ACPF cell. term...

In this study, a new double pulse waveform-generating test system with an integrated magnetorheological (MR) damper is proposed. Since the total shear stress of MR fluid can be varied according to shape particles, sphere-like iron particles-based filled into damper. The consists velocity generator, three masses (impact, test, and dummy), spring, To tune waveform profile, damping force model constructed determine fundamental parameters simulator. Then, first second shock profiles are analyzed...

In pyroprocessing it is important to determine the amount of Pu in various streams materials involved. This paper presents two approaches mass spent fuel assemblies using nondestructive assay and burnup simulation code. Cm balance adopted concept "Cm ratio," ratio Cm, used for nuclear material accountancy model facility. The biggest error expected arise from determination input homogeneously mixed uranium oxide powder, which assayed nondestructively. One approach apply average by ORIGEN...

New clathrate-based phase-change materials with cage-like structures incorporating Cs and Ba guest atoms, are reported as a means of altering crystallization amorphization behavior by controlling 'guest-cage' interactions via intra-complex vibrational effects. Both high resistance to spontaneous crystallization, long retention the amorphous phase achieved, well low melting energy. This approach provides route for achieving cage-controlled semiconductor devices.

This paper investigates the deploying time (or response time) of an active hood lift system (AHLS) a passenger vehicle activated by gunpowder actuator. In this work, is accomplished changing principal design parameters latch part mechanism system. After briefly introducing working principle AHLS operated actuator, governing equations are formulated for each different motion. Subsequently, using equations, hold determined several geometric distances such as distance from rotational center...

This article investigates the change in deploying time of an active hood lift mechanism a passenger vehicle activated by gunpowder actuator. Especially, this work, is investigated changing principal design parameters hinge part mechanism. After briefly introducing working principle operated actuator, governing dynamic equations are formulated for motion. Subsequently, using motion, response several geometric locations such as location Then, comparison made total to completely deploy with...

Abstract Robot-assisted surgery has been extensively applied in various microsurgical disciplines owing to its enhanced accuracy and dexterity based on the motion-scaling function between a hand surgical instrument. However, robot system developed thus far incurs high manufacturing costs restricted compatibility due complicated control system, including many actuators sensors. This paper proposes novel passive mechanism for motion scaling pantograph structure resolve these drawbacks of...

This paper presents experimental results of shock mitigation pedestrians from a frontal crash with sports utility vehicle (SUV) by utilizing new active hood mechanisms; pop-up and extended hood. The mechanism to protect pedestrian colliding the area SUV is proposed manufactured. Then, deployment completion time whole lift system, which significantly affects injury sustained measured headform impact test on system performed evaluate head impact. It shown that using mechanism, value can be...