We review the work carried out in the X13 R&D Straight Section of the NSLS X-Ray Ring on small gap in-vacuum undulators (IVUNs). Then we discuss: (1) plans to replace the pure permanent magnet undulator in X13 by a hybrid design providing stronger magnetic fields, enhancing the tunability of the device; (2) plans to install hybrid IVUNs in the two RF straights of the X-Ray Ring, increasing the ...

Let Fq be a finite field of q=pk elements. For any z∈Fq, let An(z) and Bn(z) denote the number solutions equations x13+x23+⋯+xn3=z x13+x23+⋯+xn3+zxn+13=0 respectively. Recently, using generator Fq⁎, Hong Zhu gave generating functions ∑n=1∞An(z)xn ∑n=1∞Bn(z)xn. In this paper, we give ∑n=1∞Bn(z)xn immediately by coefficient z. Moreover, formulas equation a1x13+a2x23+a3x33=0 our are determined coe...

In this paper, we initiate the study of a new class of algebras, which we call cluster algebras. Before giving precise definitions, we present some of the main features of these algebras. For any positive integer n, a cluster algebra A of rank n is a commutative ring with unit and no zero divisors, equipped with a distinguished family of generators called cluster variables. The set of cluster v...

In this study, the optimization of medium components used for production lipase enzyme from Cryptococcus albidus D24 was performed using Plackett-Burman statistical design method (PBD), and most important nutrients affecting strain were determined as first step. According to PBD, highest activity (19.34 U/ml/min) obtained with including Tween 80 (X2) 2.5% (v/v), (g/L) Peptone (X4) 8.0, Yeast Ex...

در این تحقیق،فرآیند جذب گاز دی اکسیدکربن با استفاده از زئولیت13 در یک راکتور بستر ثابت مورد مطالعه قرار گرفت. آزمایش های جذب در یک بستر ثابت با ارتفاع 1 متر و قطر 10 سانتیمتر انجام گردید. آزمایشات جذب جهت بررسی پارامترهای عملیاتی شامل دما، فشار، دبی گاز و مقدار جاذب انجام گرفت. نتایج آنالیز ذرات جاذب نشان داد که متوسط قطر حفرات جاذب 92/1 نانومتر و سطح ویژه 697 مترمربع بر گرم می باشد. نتایج آزما...