[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

基礎講座 電気泳動(Electrophoresis)

Intermolecular And Surface Forces

Ion acceleration driven by superintense laser pulses is attracting an impressive and steadily increasing effort. Motivations can be found in the applicative potential and in the perspective to investigate novel regimes as available laser intensities will be increasing. Experiments have demonstrated, over a wide range of laser and target parameters, the generation of multi-MeV proton and ion beams with unique properties such as ultrashort duration, high brilliance, and low emittance. An overview is given of the state of the art of ion acceleration by laser pulses as well as an outlook on its future development and perspectives. The main features observed in the experiments, the observed scaling with laser and plasma parameters, and the main models used both to interpret experimental data and to suggest new research directions are described.

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Ion acceleration by superintense laser-plasma interaction

Polymers have assumed the leading role as substrate materials for microfluidic devices in recent years. They offer a broad range of material parameters as well as material and surface chemical properties which enable microscopic design features that cannot be realised by any other class of materials. A similar range of fabrication technologies exist to generate microfluidic devices from these materials. This review will introduce the currently relevant microfabrication technologies such as replication methods like hot embossing, injection molding, microthermoforming and casting as well as photodefining methods like lithography and laser ablation for microfluidic systems and discuss academic and industrial considerations for their use. A section on back-end processing completes the overview.

Polymer microfabrication technologies for microfluidic systems

This paper presents the integration on a single chip of multiple electrochemical sensors based on amperometric and potentiometric techniques, as well as of a physical sensor. The prototype comprises six sensors for in-situ monitoring of important parameters of a bioprocess; glucose, lactate, pH, cell density, dissolved oxygen, and temperature. All sensor elements have been calibrated and showed acceptable detection performance. We also demonstrate a preliminary experiment for in-situ monitoring in a yeast culture to better understand the response of the proposed microsensors towards yeast fermentations application.

Miniaturized Electrochemical Device for In-Situ Monitoring of Glucose, Lactate, Dissolved Oxygen, PH, and Temperature in Yeast Culture

In this paper, a new wideband RF MEMS switch using lateral and vertical actuations has been proposed which can be used for wide frequency band. The switch consists of one side clamped bridge and two electrostatic actuators array which move the bridge laterally. There is also one vertical electrostatic actuator which moves the bridge up and down. This actuation voltage is equal to 15 V. A flexible hinge is used in the proposed structure, which has a little spring constant in the lateral direction. Thus, by applying a small voltage, the switch bridge can be moved laterally to left or right and it changes the capacitive area between the bridge and RF signal line both in up and down positions. Depending on left or right electrostatic actuation forces, the bridge moves to left or right and the switch capacitive area is increased or decreased. The lateral actuation voltage of the proposed switch is equal to 2 V. Briefly, the switch can operate in wider bandwidth than conventional structure which consists of only vertical actuator. The simulations are done by HFSS and COMSOL softwares. The bandwidth of this switch is from 4.5 to 10 GHz.

Wideband RF MEMS switch using two dimensional actuations

A new 128 elements pMUT-based phased array ultrasound transducer for medical imaging applications is described for the first time. The active area of the transducer has a dimension of 26 mm long by 10.4 mm wide. There are 6270 pMUTs in the transducer and each pMUT has a membrane diameter of and the pitch between each two elements is. The transducer has a −3dB and −6dB bandwidth of 118% and 184%, respectively, with a center frequency of 1.5 MHz. The bandwidth is higher than any previously reported transducer in any technology, such as bulk-PZT, pMUT, or capacitive MUT (cMUT). The transducer benefits from a high transmission and receive sensitivity of 430 Pa/V @ 3 cm and 190 mV/MPa, respectively.

A $128\times 1$ Phased Array Piezoelectric Micromachined Ultrasound Transducer (pMUT) for Medical Imaging

This paper describes a MEMS accelerometer with an auto-tuning system based on an electrostatic anti-spring. The sensitivity of the accelerometer can be tuned automatically to change its dynamic range and bandwidth according to acceleration inputs. A detailed theoretical analysis and experimental verification were conducted. There is a good agreement between experimental results theoretical calculations. The auto-tuning design has a larger displacement under different acceleration inputs, compared with a conventional design. When the acceleration input is 17.45 μg, the sensitivity of the auto-tuning design (18.4 V/g) is 14.4 times of that of the conventional design (1.28 V/g). The sensitivity is higher for lower acceleration inputs.

A Mems Accelerometer with an Auto-Tuning System Based on an Electrostatic Anti-Spring

This paper proposes an algorithm for the extraction of reduced order models of MEMS switches, based on using a physics aware simplification technique.

Michael Kraft

Papers

Miniaturized Electrochemical Device for In-Situ Monitoring of Glucose, Lactate, Dissolved Oxygen, PH, and Temperature in Yeast Culture

Wideband RF MEMS switch using two dimensional actuations

A $128\times 1$ Phased Array Piezoelectric Micromachined Ultrasound Transducer (pMUT) for Medical Imaging

A Mems Accelerometer with an Auto-Tuning System Based on an Electrostatic Anti-Spring

Simplification by pruning as a model order reduction approach for RF-MEMS switches