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Haroon,Ahsan M.A.H. 한국물리학회 2023 Current Applied Physics Vol.56 No.-
The T-shaped double quantum dot system with single-walled metallic armchair carbon nanotube leads has been studied using Green functions obtained by the equation of motion method. The effect of relative spacing between the energy levels of the dots, interdot tunneling matrix-element, interdot Coulomb interaction, and van-Hove singularities in density of states characteristics of quasi-one-dimensional carbon nanotube leads on the conductance of the double quantum dot system has been studied. The conductance and dot occupancies are calculated at finite temperatures. The density of states of the carbon nanotube leads is observed to play a significant role in determining the conductance profile. In particular, whenever the chemical potential of the isolated double quantum dot system is aligned with the position of a van-Hove singularity in the density of states of armchair carbon nanotube leads, the height of the corresponding conductance peak falls considerably. It is further observed that the suppression in the heights of the alternate peaks depends on the relative positions of the energy levels of the dots and their magnitude of separation.
Haroon,Li Yu‐Xin,Ye Chen‐Xu,Ma Xiao‐Qin,Su Jian,Su Xiao‐Hong,Xing Lian‐Xi 한국곤충학회 2021 Entomological Research Vol.51 No.9
Aging and longevity is a dynamic, chronological process assumed to originate from several hallmarks causing archetypal and beguiling cycles with incredible natural diversity. This phenomenon is widely observed in different animals, and the estimated age of Drosophila melanogaster, Caenorhabditis elegans, Daphnia longispina are a few days to weeks. Reproductive termites live for 30 years, although the root cause of longevity in termite castes is still debated for molecular and cellular changes. Insulin and insulin signaling pathway-related (IIS) genes are important metabolic factors (glucose) highly conserved in lower to higher organisms. Therefore, in this study, we pooled Reticulitermes chinensis castes as primary king (PK), primary queen (PQ), ergatoid king “SWRK” and queen “SWRQ”,male (WM), and female (WF) workers. We determined transcriptome sequencing of R. chinensis castes as a model organism for longevity to investigate the insulin signaling pathway and longevity genes. Through RNA-sequencing, we identified 35 IIS- pathway-related genes out of 343 to the KEGG pathway in ergatoid king and queen, PK, PQ, WM, and WF. Among these genes, Ts c 2 , akt2-a, mTOR, EIF4E, Pdk1,and RPS expressed highly in ergatoid king and queen, PK, and PQ. However, a significant cornerstone tradeoff between reproductive and non-reproductive efforts for early life is essential for evolutionary longevity. The present study concludes that a highly conserved IIS-pathway is evidence for the prolonged termite reproductive life span. We recommended devoting insulin signaling pathway genes to their biological function for termite survival and new insights into the maintenance and relationships between biomolecular homeostasis and remarkable longevity.
Response Modification Factor of Precast Reinforced Concrete Moment Resisting Frame
HAROON MUHAMMAD,변현우,이범식,김길희,이정윤 한국콘크리트학회 2020 콘크리트학회논문집 Vol.32 No.6
Under severe seismic demands if structures are designed to remain within the elastic range, the results sections may highly be uneconomical because the maximum response acceleration is usually several times the maximum ground acceleration, depending on the structural stiffness and the magnitude of damping. Therefore, current design codes recommend much lower design seismic loads compared to the inertia loads for elastic response of structures by using the force reduction or response modification factor based on the equal energy dissipation concept. The response modification factor is used to reduce the actual base shear force to the design level force during an earthquake excitation. Various design codes i.e. ACI318-19, ASCE 7-10 etc. have come up with different R-factor values for different structural systems including the pre-cast moment frames. However, the Korean Concrete Institute design codes provide the R-factor values for cast-in place concrete moment frames along with other lateral load resisting systems but ignore the precast concrete structures. In this study, efforts are made to estimate the response modification factor for the precast RC moment resisting frames using nonlinear static push-over analysis. The types of the frames considered in this study are precast RC frames with strength and deformation capacity equal to 100 %, 75 % and 50 % of that of a monolithic RC frame. The result of this study shows that the R-factors of the three precast moment resisting frames were 6.5, 6.3 and 5.4, respectively.
DEGENERATE BERNOULLI NUMBERS AND POLYNOMIALS ASSOCIATED WITH DEGENERATE HERMITE POLYNOMIALS
Haroon, Hiba,Khan, Waseem Ahmad Korean Mathematical Society 2018 대한수학회논문집 Vol.33 No.2
The article is themed to classify new (fully) degenerate Hermite-Bernoulli polynomials with formulation in terms of p-adic fermionic integrals on $\mathbb{Z}_p$. The entire paper is designed to illustrate new properties in association with Daehee polynomials in a consolidated and generalized form.
A Review of Rear Axle Steering System Technology for Commercial Vehicles
Haroon Ahmad Khan(하룬 아흐마드 칸),So-Nam Yun(윤소남),Eun-A Jeong(정은아),Jeong-Woo Park(박정우),Chung-Mok Yoo(유충목),Sung-Min Han(한성민) 유공압건설기계학회 2020 드라이브·컨트롤 Vol.17 No.4
This study reviews the rear or tag axle steering system’s concepts and technology applied to commercial vehicles. Most commercial vehicles are large in size with more than two axles. Maneuvering them around tight corners, narrow roads, and spaces is a difficult job if only the front axle is steerable. Furthermore, wear and tear in tires will increase as turn angle and number of axles are increased. This problem can be solved using rear axle steering technology that is being used in commercial vehicles nowadays. Rear axle steering system technology uses a cylinder mounted on one of rear axles called a steering cylinder. Cylinder control is the primary objective of the real axle steering system. There are two types of such steering mechanisms. One uses master and slave cylinder concept while the other concept is relatively new. It goes by the name of smart axle, self-steered axle, or smart steering axle driven independently from the front wheel steering. All these different types of steering mechanisms are discussed in this study with detailed description, advantages, disadvantages, and safety considerations.
Celastrol-mediated autophagy regulation in cancer
Haroon Muhammad,Kang Sun Chul 한국응용생명화학회 2020 Applied Biological Chemistry (Appl Biol Chem) Vol.63 No.6
In the last few decades, studies on autophagy regulation and its potential role in cancer therapeutics have expanded to include detailed mechanisms. Since apoptosis exhibits drug resistance in some cancers, eforts have focused on searching for compounds with autophagy modulating properties. Numerous natural compounds have been used in cancer treatment and are considered a signifcant research area due to their remarkable anti-cancer properties. Celastrol, a quinone methide triterpene, derived from Tripterygium wilfordii, has recently drawn much attention because of its anticancer potential. It enhances tumor suppression and induces autophagy in cancer cells by regulating signaling pathways such as Beclin-1, Akt/mTOR, ROS, NF-κB, MAPK, HSP90, and the proteasome. In the current study, we address the anticancer potential of celastrol, its efect on various cellular pathways, and describe how it functions as an autophagy modulator in cancer therapeutics and helps diminish multidrug resistance in cancer cells.
Haroon Elrasheid Tahir,Li Zhihua,Gustav Komla Mahunu,Zou Xiaobo,Muhammad Arslan,Huang Xiaowei,Zhikun Yang,Abdalbasit Adam Mariod 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.2
The marketability of blueberries over long distances has been limited because of their highly perishability. To prolong the postharvest shelf life and conserve quality properties of blueberry, various alternatives have been evaluated. We studied the influence of gum arabic (GA) alone or GA enhanced with African baobab (AB) fruit extract on blueberry during cold storage (4 C) for 21 days. Physico-chemical properties (e.g. pH, color, firmness, and weight loss), microbial decay, antioxidant properties, polyphenol oxidase (PPO) and peroxidase (POD) activity were investigated. The fruit treated with GA combined AB indicated a significant delay in microbial decay, firmness loss, weight loss, and color change. The treatments on blueberries resulted in better preservation of total phenols and total anthocyanins delayed the increase in total soluble solids as compared to the control. The coatings lowered the activities of PPO and POD enzymes and delayed microbial decay in coated blueberry during 21 days of storage.