نتایج جستجو برای: ndr

تعداد نتایج: 534  

Journal: :Nano letters 2015
Joaquin F Rodriguez-Nieva Mildred S Dresselhaus Leonid S Levitov

Transport in photoactive graphene heterostructures, originating from the dynamics of photogenerated hot carriers, is governed by the processes of thermionic emission, electron-lattice thermal imbalance, and cooling. These processes give rise to interesting photoresponse effects, in particular negative differential resistance (NDR) arising in the hot-carrier regime. The NDR effect stems from a s...

2000
Egor Alekseev Dimitris Pavlidis

The GaN material parameters relevant to the negative di€erential resistance (NDR) devices are discussed, and their physical models based on the theoretical predictions and experimental device characteristics are introduced. Gunn diode design criteria were applied to design the GaN NDR diodes. A higher electrical strength of the GaN allowed operation with higher doping ( 10 cmÿ3) and at a higher...

Journal: :Journal of the American Chemical Society 2006
Rui Liu San-Huang Ke Harold U Baranger Weitao Yang

Analogous to a quantum double-dot system, diblock structured molecules could also show negative differential resistance (NDR). Using combined density functional theory and nonequilibrium Green function technique, we show that molecular-level crossing in a molecular double-dot system containing cobaltocene and ferrocene leads to NDR and hysteresis.

2015
Debora Schmitz-Rohmer Simone Probst Zhong-Zhou Yang Frédéric Laurent Michael B. Stadler Aimée Zuniga Rolf Zeller Debby Hynx Brian A. Hemmings Alexander Hergovich Robert W. Dettman

Studies of mammalian tissue culture cells indicate that the conserved and distinct NDR isoforms, NDR1 and NDR2, play essential cell biological roles. However, mice lacking either Ndr1 or Ndr2 alone develop normally. Here, we studied the physiological consequences of inactivating both NDR1 and NDR2 in mice, showing that the lack of both Ndr1/Ndr2 (called Ndr1/2-double null mutants) causes embryo...

Journal: :Investigative ophthalmology & visual science 2017
Fangyao Tang Carol Y Cheung

Purpose To compare optical coherence tomography (OCT) angiographic parameters in retina and choriocapillaris between control subjects and diabetic patients without diabetic retinopathy (NDR). Correlations were studied between OCT angiography parameters, retinal structure parameters, and systemic characteristics in all subjects. Methods Sixty-two patients were included in the study: control su...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 1389

امواج تراهرتز معمولاً به امواجی در بازه فرکانسی (100ghz-30thz) اطلاق می گردد. این امواج کاربردهای وسیعی در صنعت پزشکی، بیولوژی، عکسبرداری، مخابرات ایمن و باند پهن و ... دارد. از طرف دیگر مواد نیتریدی و بخصوص نانوساختارهای آنها، تحت میدانهای الکتریکی قوی از خود خاصیت ndr نشان می دهند لذا انتظار می رود با طراحی و مدل ساختاری بتوان امواج تراهرتز از ادوات مربوطه تولید نمود. در طرح شرایط متفاوت ایجاد...

Journal: :International journal of statistics and applied mathematics 2023

A field experiment was conducted in four levels of sculpture (0, 20, 40 and 60 kg/ha) three varieties Indian mustard (NDR-8501, NDRE-4 Vardan) at Agronomy Research Farm, Narendra Deva University Agriculture Technology, Kumarganj, Faizabad, during 2012-2013. Among various dose the application kg S/ha found optimum for increasing seed yield (15.30 q/ha) oil percentage (39.36%) content mustard. Va...

2015
Kwang-Jow Gan Kuan-Yu Chun Wen-Kuan Yeh Yaw-Hwang Chen Wein-So Wang

The behavior of two frequency divider circuits using negative differential resistance (NDR) circuit is studied. This NDR circuit is made of three resistors (R) and two bipolar-junction-transistor (BJT) devices. It can show the NDR characteristic in its current-voltage curve by suitably designing the resistances. We discuss a dynamic frequency divider, which is made of a R-BJT-NDR circuit, an in...

Journal: :Journal of bacteriology 2008
Ying Zhang Mireille N Vankemmelbeke Lisa E Holland David C Walker Richard James Christopher N Penfold

Enzymatic colicins such as colicin E9 (ColE9) bind to BtuB on the cell surface of Escherichia coli and rapidly recruit a second coreceptor, either OmpF or OmpC, through which the N-terminal natively disordered region (NDR) of their translocation domain gains entry into the cell periplasm and interacts with TolB. Previously, we constructed an inactive disulfide-locked mutant ColE9 (ColE9(s-s)) t...

2015
Yi-Wen Chen Ying-Ying Wang Dong Zhao Cai-Guo Yu Zhong Xin Xi Cao Jing Shi Guang-Ran Yang Ming-Xia Yuan Jin-Kui Yang

Little is known about the relationship between lower extremity peripheral arterial disease (PAD) and proliferative diabetic retinopathy (PDR) in type 2 diabetes (T2D). Here, we explored the relationship between sight-threatening PDR and PAD. We screened for diabetic retinopathy (DR) and PAD in hospitalized patients with T2D. Patients with a diabetic duration of more than 10 years, HbA1c ≥7.5%, ...

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