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Quantum Modeling of Nanoscale Symmetric Double-Gate InAlAs/InGaAs/InP HEMT
Verma, Neha,Gupta, Mridula,Gupta, R.S.,Jogi, Jyotika The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.4
The aim of this work is to investigate and study the quantum effects in the modeling of nanoscale symmetric double-gate InAlAs/InGaAs/InP HEMT (High Electron Mobility Transistor). In order to do so, the carrier concentration in InGaAs channel at gate lengths ($L_g$) 100 nm and 50 nm, are modelled by a density gradient model or quantum moments model. The simulated results obtained from the quantum moments model are compared with the available experimental results to show the accuracy and also with a semi-classical model to show the need for quantum modeling. Quantum modeling shows major variation in electron concentration profiles and affects the device characteristics. The two triangular quantum wells predicted by the semi-classical model seem to vanish in the quantum model as bulk inversion takes place. The quantum effects thus become essential to incorporate in nanoscale heterostructure device modeling.
Quantum Modeling of Nanoscale Symmetric Double-Gate InAIAs/InGaAs/InP HEMT
Neha Verma,Mridula Gupta,R.S. Gupta,Jyotika Jogi 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.4
The aim of this work is to investigate and study the quantum effects in the modeling of nanosclae symmetric double-gate InAIAs/InGaAs/InP HEMT (High Electron Mobility Transistor). In order to do so, the carrier concentration in InGaAs channel at gate lengths (Lg 100 ㎚ and 50㎚, are modelled by a density gradient model or quantum moments model. The simulated results obtained from the quantum moments model are compared with the available experimental results to show the accuracy and also with a semi-classical model to show the need for quantum modeling. Quantum modeling shows major variation in electron concentration profiles and affects the device characteristics. The tow triangular quantum wells predicted by the semi-classical model seem to vanish in the quantum model as bulk inversion takes place. The quantum effects thus become essential to incorporate in nanosclae heterostructure device modeling.
Neha Verma,Vinay Sharma,M. Affan Badar,Niharika Choubey,Rityuj Singh Parihar 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.10
Over-coating of the zinc layer in the hot-dip galvanization process is a common issue. The coating thickness of zinc depends on various factors such as zinc bath temperature, dipping time, silicon percentage in steel, alloy composition in zinc bath, etc. In the current work, three factors: dipping time, silicon percentage in steel, and nickel percentage in zinc bath have been considered in an unreplicated 23 factorial design using secondary data from Bondareva (Materials Science Forum 992:689–694, 2020). Lenth’s method and normal probability plot are utilized to analyze the factorial design. It is identified that dipping time and nickel percentage are the two significant factors impacting the coating thickness. At 0.05% of nickel and 3 min of dipping time, minimum coating thickness is achieved, i.e., the thickness reduces up to 38.96% and 29.57% for 0.18% and 0.28% silicon-containing steels, respectively as compared to no nickel present in the zinc bath at 5 min of dipping time. All the experiments correspond to a bath temperature of 450 °C and phosphorus content of 2.5% in steels. The result is beneficial for industry to achieve better product quality and gain competitive advantage.
A Review on Routing Information Protocol (RIP) and Open Shortest Path First (OSPF) Routing Protocol
Abhishek Verma,Neha Bhardwaj 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.4
The routing protocol transport the best connection, creating during message in the network. The router can work with the help of routing protocols. The various routing protocols can be present, but the most famous routing protocols are Routing Information protocol (RIP) and the Open Shortest Path First (OSPF). Smart Open Shortest Path First (S-OSPF), which offers the extended representations for conventional OSPF gives less congestion ratio by allocating traffic. Multicast Open Shortest Path First (MOSPF), it offers the facility to forward multicast datagram from one network to another. In this paper, we are defining the two protocols and the related worked on them. In this each link provides the autonomous system to create the shortest path to makes and creates the destination tables. Both logical and hardware address play the important roles, responsible for getting packet and forward through a correct destination host.
김재훈,( Neha Karanwal ),( Deepak Verma ),( Malayil Gopalan Sibi ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Herein, we presented highly selective hydrogenation of ketonic (> C=O) group in levulinic acid (LA) into 1,4-pentanediol (1,4-PDO) over ZnO-promoted Cu-Ni-H-ZSM-5 catalyst under mild reaction conditions (120 °C, 2.5 MPa and 2 h) in an aqueous medium. The 1,4-PDO selectivity was up to 93.7%. The presence of intermetallic Cu-Ni, Cu-Zn and Ni-Zn sites in the catalyst, which was confirmed by HAADF-STEM analysis, was found to be highly active sites for the reactant conversion. Not only this, the change in acid density of the catalyst proximate to the metal sites accelerated the reaction in the forward direction; the weak Lewis acid sites increased upon increasing the metal content, while both the moderate and strong acid sites decreased. The catalyst could be efficiently recycled and reused through simple treatments, offering above 90% LA conversions and high-yield 1,4-PDO in consecutive reactions.
Insyani, Rizki,Verma, Deepak,Cahyadi, Handi Setiadi,Kim, Seung Min,Kim, Seok Ki,Karanwal, Neha,Kim, Jaehoon Elsevier 2019 Applied Catalysis B Vol.243 No.-
<P><B>Abstract</B></P> <P>Tandem heterogenous catalysis of bimetallic Cu-Pd on UiO-66(NH<SUB>2</SUB>) that were incorporated into sulfonated graphene oxide (Cu-Pd/UiO-66(NH<SUB>2</SUB>)@SGO or Cu-Pd/US) was investigated for the one-pot, direct conversion of di- and polysaccharides into 2,5-dimethylfuran (2,5-DMF) without separation of reaction intermediates. In the absence of a homogeneous acidic catalyst, consecutive reactions of glycosidic bond cleavage, isomerization, dehydration, and hydrogenation/hydrogenolysis were preceded by the synergistic effect of a multifunctional Cu-Pd/US catalyst. The strength and ratio of Brønsted and Lewis acid sites by adjusting UiO-66(NH<SUB>2</SUB>) to SGO ratios resulted in high-yield 5-(hydroxymethyl)furfural (5-HMF) through sequential glycosidic bond cleavage, isomerization, and dehydration of sucrose. Unlike monometallic Cu and Pd, bimetallic Cu-Pd promoted consecutive COH hydrogenolysis and CO hydrogenation of reaction intermediates, producing 2,5-DMF with a high yield of 73.4% during the one-pot conversion of sucrose at 200 °C and 1 MPa H<SUB>2</SUB> for 3 h. When starch was converted over Cu-Pd/US, 2,5-DMF was formed with 53.6% yield. Direct cellulose conversion into 2,5-DMF with a yield of 29.8% was achieved in the presence of 0.01 M HCl and Cu-Pd/US. The presence of the amino functional group (-NH<SUB>2</SUB>) in the UiO-66 framework was beneficial for improving the feed conversion and maintaining catalyst recyclability up to five times with almost no activity loss.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cascade reactions from di- and polysaccharides to 2,5-DMF over CuPd/UiO-66(NH<SUB>2</SUB>)@SGO. </LI> <LI> Control of Brønsted and Lewis acid sites by adjusting UiO-66(NH<SUB>2</SUB>) to SGO ratio. </LI> <LI> Cu-Pd selectively promoted COH hydrogenolysis and CO hydrogenation of 5-HMF. </LI> <LI> One-pot sucrose conversion to 73.4% yield 2,5-DMF without intermediate purification. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>