http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Large area PPAC development at the Rare Isotope Science Project
Akers, Charles,Lee, Kwang Bok,Kim, Young Jin,Hashimoto, Takashi,Kim, Eun Hee,Lee, Hyo Sang,Park, Jin Hyung,Ryu, Min Sang,Tshoo, Kyoungho,Kang, Byoung Hwi,Kwon, Young Kwan Elsevier 2018 Nuclear Instruments & Methods in Physics Research. Vol.910 No.-
<P><B>Abstract</B></P> <P>Large area position sensitive parallel plate avalanche counters (PPACs) have been fabricated for the Rare Isotope Science Project. These detectors have active areas of 20 × 20 cm<SUP>2</SUP> and 40 × 20 cm<SUP>2</SUP>, and utilize a stripped electrode structure, together with a delay-line readout, to extract position information. The 20 × 20 cm<SUP>2</SUP> detector performance was tested with 3 MeV/u <SUP>12</SUP>C and <SUP>16</SUP>O beams. A position resolution better than 1 mm, full width at half maximum, and a detection efficiency of 94% were measured with an incident beam intensity of 2 × 10<SUP>6</SUP> particles per second. A new production technique, using photolithography, that makes the fabrication of stripped PPAC electrodes larger in area than was previously possible, is also presented.</P>
Construction and performance test of prototype parallel plate avalanche counters at RAON
Akers, C.,Lee, K. B.,Kim, Y. J.,Kim, E. H.,Kwon, Y. K.,Lee, H. S.,Moon, J. Y.,Park, J. H.,Ryu, M. S.,Shin, T. 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>Two prototype position sensitive parallel plate avalanche counters (PPACs) have been fabricated at the Rare Isotope Science Project (RISP). Both detectors have active areas of 10 x 10 cm(2) and utilize a stripped electrode structure, together with a delay line readout, to extract position information. Testing was conducted with an Am-241 alpha source, and 2-dimensional position information was obtained. A position resolution of 0.55 mm full width at half maximum (FWHM), together with a position linearity of +/- 55 mu m over a 67-mm detection range, were measured. A time resolution of 450 ps (FWHM) was also measured.</P>
Construction and Performance Test of Prototype Parallel Plate Avalanche Counters at RAON
Charles Akers,이광복,김영진,김은희,권영관,이효상,문전영,박진형,류민상,신택수,Satou Yoshiteru 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.7
Two prototype position sensitive parallel plate avalanche counters (PPACs) have been fabricated at the Rare Isotope Science Project (RISP). Both detectors have active areas of 10 × 10 cm2 and utilize a stripped electrode structure, together with a delay line readout, to extract position information. Testing was conducted with an 241Am source, and 2-dimensional position information was obtained. A position resolution of 0.55 mm full width at half maximum (FWHM), together with a position linearity of ±55 μm over a 67-mm detection range, were measured. A time resolution of 450 ps (FWHM) was also measured.
The virtual penetration laboratory: new developments for projectile penetration in concrete
Mark D. Adley,Andreas O. Frank,Kent T. Danielson,Stephen A. Akers,James L. O’Daniel 사단법인 한국계산역학회 2010 Computers and Concrete, An International Journal Vol.7 No.2
This paper discusses new capabilities developed for the Virtual Penetration Laboratory (VPL) software package to address the challenges of determining Penetration Resistance (PR) equations for concrete materials. Specifically, the paper introduces a three-invariant concrete constitutive model recently developed by the authors. The Advanced Fundamental Concrete (AFC) model was developed to provide a fast-running predictive model to simulate the behavior of concrete and other high-strength geologic materials. The Continuous Evolutionary Algorithms (CEA) automatic fitting algorithms used to fit the new model are discussed, and then examples are presented to demonstrate the effectiveness of the new AFC model. Finally, the AFC model in conjunction with the VPL software package is used to develop a PR equation for a concrete material.
Constitutive property behavior of an ultra-high-performance concrete with and without steel fibers
E.M. Williams,S.S. Graham,S.A. Akers,P.A. Reed,T.S. Rushing 사단법인 한국계산역학회 2010 Computers and Concrete, An International Journal Vol.7 No.2
A laboratory investigation was conducted to characterize the constitutive property behavior of Cor-Tuf, an ultra-high-performance composite concrete. Mechanical property tests (hydrostatic compression, unconfined compression (UC), triaxial compression (TXC), unconfined direct pull (DP), uniaxial strain, and uniaxial-strain-load/constant-volumetric-strain tests) were performed on specimens prepared from concrete mixtures with and without steel fibers. From the UC and TXC test results, compression failure surfaces were developed for both sets of specimens. Both failure surfaces exhibited a continuous increase in maximum principal stress difference with increasing confining stress. The DP tests results determined the unconfined tensile strengths of the two mixtures. The tensile strength of each mixture was less than the generally assumed tensile strength for conventional strength concrete, which is 10 percent of the unconfined compressive strength. Both concretes behaved similarly, but Cor-Tuf with steel fibers exhibited slightly greater strength with increased confining pressure, and Cor-Tuf without steel fibers displayed slightly greater compressibility.