CsI calorimeter with 3-D position resolution

اختصاصی از زد فایل CsI calorimeter with 3-D position resolution دانلود با لینک مستقیم و پر سرعت .

New gamma-ray calorimeter have been develop ed for the MEGA Compton camera.They consist of arrays of small CsI(Tl) scintillator bars read out by Silicon PIN- diodes and low noise, self triggering frontend electronics. The length of the bars (the thickness of the calorimeter) can b e varied for different applications to fit the stopping power needed and the light loss tolerable. In this paper we present calibration results from 2cm long bars with diodes on one side, and 8cm long bars with diodes on two opposite sides.

Doublesided readout gives 3-D information of interactions which will b e used to overcome the limited position resolution in Anger-cameras at high energies. Simpler detection devices like Anger-cameras might finally resolve only the center of gravity.

As events from gamma rays with energies of MeV do extend over several cm, it is a prerequisite for an imaging device to resolve the interaction structure in detail.

Combining CsI(Tl) scintillators, Silicon PIN-photo dio des and frontend electronics inside the housing results in a cheap rugged design. While the development in our institute is mainly done for the Compton camera prototyp e, many other applications are conceivable.

The New Applications of High Resolution GIS Digital Terrain Analysis Tools (TOPMANGE) To Study the Management of Flow on Farms

اختصاصی از زد فایل The New Applications of High Resolution GIS Digital Terrain Analysis Tools (TOPMANGE) To Study the Management of Flow on Farms دانلود با لینک مستقیم و پر سرعت .

عنوان مقالهThe New Applications of High Resolution GIS Digital Terrain Analysis Tools (TOPMANGE) To Study the Management of Flow on Farms

نام نویسنده

Nasser Najibi, Mahmoud Reza Delavar

پست الکترونیکی

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حجم فایل

378 کیلو بایت  

کلمات کلیدی مقاله :

Runoff Management, TOPMANGE, Terrain analysis, GIS

چکیده مقاله :

We know Runoff Management is a concept that involves understanding how flow is lost from farmers fields and how this can be changed for the purpose of pollution remediation and flood storage. In order to support this concept a software tool called TOPMANGE has been developed to simulate hydrological flow paths which include the effects of manmade features [1]. TOPMANGE is a high resolution GIS terrain analysis toolkit that allows the user to manipulate flows for the net benefit to the environment. This study involves a number of case studies looking at fields prone to overland flow lost and examples for fields dominated by subsurface flow and land drains. Man made features such as tramlines, tire tracks; land drains and ditches all control runoff [2]. These features can be altered to change the nature of the runoff on the farm, such as altering the cultivation direction. New landscape features such as ponds and new hedgerows can be used to simulate the effect of disconnecting polluting flows and increasing the buffering capacity of the land. Diffuse temporary storage ponds also offer opportunities to remediate flows, whilst still on the farm itself.