Development of combined microstructure and structure characterization facility forin situandoperandostudies at the Advanced Photon Source

An Operator Training Facility at the Advanced Photon Source*

The Advanced Photon Source (APS), a premier thirdgeneration synchrotron radiation source, presently operates in top-up mode during most user run time. During top-up mode, charge is injected into the storage ring at approximately 2-minute intervals to stabilize the stored beam current to within 0.1%. Top-up mode requires the dedicated use of the entire APS injector system, severely limiting time...

High-Precision Positioning Mechanism Development at the Advanced Photon Source

There are many challenging tasks in the design of the beamline instrumentation that relate to high precision positioning mechanism for users at a third-generation synchrotron radiation source, such as the 7 GeV Advanced Photon Source (APS). Over the last few years, progress has been made in the development of novel mechanisms with high positioning resolution and high stability at the APS. Appli...

X-ray Interferometry Development at the Advanced Photon Source*

In this paper, we report initial test results of a four-bounce Bragg reflection Xray interferometer at 7.46 keV and, for the first time to our knowledge, at the higher energy of 14.91 keV where the spectral acceptance is much smaller. INTRODUCTION The triple Laue (LLL) interferometer is one of the most used X-ray interferometers, be it in ultra-precision metrology’ or in imaging techniques. The...

the underlying structure of language proficiency and the proficiency level

هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...

The Advanced Photon Source a National Synchrotron Radiation Research Facility