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Journal articles on the topic 'Twisted circular rod'

Author: Grafiati

Published: 4 June 2025

Last updated: 14 July 2025

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1

M., Udaya Kumar*1 &. Dr. Md. Yousuf Ali 2. "NUMERICAL AND CFD ANALYSIS OF DUCT WITH INSERTS." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES 6, no. 2 (2019): 310–19. https://doi.org/10.5281/zenodo.2593969.

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The present  numerical and CFD  investigations have been carriedout to examine  friction factor and heat transfer rate of  twisted square duct with inserts. simulation is conducted   under uniform heat flux conditions  with air is a working fluid, twist angle  is 270 degree,Reynolds number is varied  from 7500 to 38000. The results of friction factor, and enhancement ratio are presented. Friction factor for twisted circular rod is 2.85 times more than twisted duct. Efficiency of twisted duct heat exchanger 42 percentage , twisted circular rod 

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2

Kudaibergenov, Askhat, Askar Kudaibergenov, and Lelya Khajiyeva. "Stability Analysis of Drill Rods as Shells in the Gas Stream." Applied Mechanics and Materials 665 (October 2014): 593–96. http://dx.doi.org/10.4028/www.scientific.net/amm.665.593.

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In the paper steadiness of the compressed and twisted drill rod is examined. The rod is presented in the form of a circular cylindrical shell, which is circulated from the outer side by a supersonic stream of gas. The rod is affected by the uniformly distributed on its length axial force and the torque. The problem of stability is solved by means of reviewing of a small deviation from the periodic solution of the problem. Boundaries of instability zones of the mechanical system are defined with application of the method of harmonic balance.

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3

Näsström, Thomas, Tobias Dahlberg, Dmitry Malyshev, et al. "Synthetic NAC 71-82 Peptides Designed to Produce Fibrils with Different Protofilament Interface Contacts." International Journal of Molecular Sciences 22, no. 17 (2021): 9334. http://dx.doi.org/10.3390/ijms22179334.

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Alpha-synucleinopathies are featured by fibrillar inclusions in brain cells. Although α-synuclein fibrils display structural diversity, the origin of this diversity is not fully understood. We used molecular dynamics simulations to design synthetic peptides, based on the NAC 71-82 amino acid fragment of α-synuclein, that govern protofilament contacts and generation of twisted fibrillar polymorphs. Four peptides with structures based on either single or double fragments and capped or non-capped ends were selected for further analysis. We determined the fibrillar yield and the structures from th

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4

Lugovoi, V. P. "Theoretical Analysis of Thin Curved Rod Displacements V. P. Lugovoi1)." Science & Technique 20, no. 5 (2021): 399–404. http://dx.doi.org/10.21122/2227-1031-2021-20-5-399-404.

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The paper presents a comparative theoretical analysis of the movements of the curved rods of various curvature forms, which can be applied as tools for ultrasonic treatment of holes in fragile materials. It has been shown that the traditional processing of holes by an ultrasonic method is based on the use of straight rods, in which the amplitudes of displacements on the working – free end corresponds to the value of displacements at the point of its attachment to the ultrasonic oscillation concentrator. Supplementing the configuration of a straight rod with a curvilinear shape in the form of a

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5

Ayad Jawad Kadhim. "Numerical Investigation of Heat Exchanger Enhancement for a Staggered Arrangement with Corrugated Rods in Front." Journal of Electrical Systems 20, no. 5s (2024): 2684–704. http://dx.doi.org/10.52783/jes.2724.

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The heat exchanger is used in many industrial and engineering activities.Where, numerous applications confirms on a large heat transfer rate. However, the twisted tube is one of heat transfer rate enhancement methods. Also, the turbulent flows are often used instead of laminar for enhancement heat transfer rate. Therefore, the tube arrangement can be used in a suitable way for utilized this purpose. The shape features of tubes in the heat exchangers are very important for enhancing their performance. As well, the pressure drop and heat transfer rate have a remarkable effect on the thermal effi

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6

Gabibov, Fakhraddin, Jasarat Jamalov, and Aytan Ahmadova. "The analysis of asbestos-cement shell pile performance under off-center loading and forced torsion." E3S Web of Conferences 363 (2022): 02015. http://dx.doi.org/10.1051/e3sconf/202236302015.

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The paper discusses the new design of a round pile with a relatively smoother surface, developed in an attempt to eliminate excessive negative friction forces. A theoretical study has been conducted into the performance of asbestos-cement shell pile exposed to off-center loading, which occurs in response to uneven deformations in the surrounding soil and seismic loads. The cross section of the upper eccentrically compressed part of a flexible asbestos-cement-pipe-concrete pile element is considered. When considering the stress-strain state of flexible eccentrically compressed asbestos-cement-p

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7

Lee, Jae-Jin, and Suk-Won Choi. "Preferential Circularly Polarized Luminescence from a Nano-Segregated Liquid Crystalline Phase Using a Polymerized Twisted Nematic Platform." Polymers 12, no. 11 (2020): 2529. http://dx.doi.org/10.3390/polym12112529.

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In this study, a polymerized twisted nematic (TN) network was used as an extrinsic chiral platform to overcome the heterogeneity during spontaneous symmetry breaking in a mixed system comprising an achiral bent-core molecule and rod-like mesogen. The TN platform was prepared by photopolymerizing a reactive mesogen dispersed in a low molecular weight liquid crystal with TN orientation. The use of TN orientation to correct the degeneracy in bent-core molecular systems has been previously reported; however, to the best of our knowledge, this is the first study that uses an extrinsic chiral platfo

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8

Hoffmann, Stefan, Juan Pablo Fuenzalida Werner, Ignacio Moreno-Villoslada, and Francisco M. Goycoolea. "New insights into the nature of the Cibacron brilliant red 3B-A – Chitosan interaction." Pure and Applied Chemistry 88, no. 9 (2016): 891–904. http://dx.doi.org/10.1515/pac-2016-0712.

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AbstractCibacron brilliant red 3B-A (CBR) has been introduced to determine chitosan (CS) concentrations in solution, and several studies applied it to measure chitosan content in pharmaceutical formulations. So far, studies have relied on the absorbance band shift to 570 nm to determine the extent of the CBR – CS interaction. In this study, we show that CBR forms micro- to nanometer sized aggregates with CS, depending on their charge ratio and that other photophysical changes in CBR are induced by this interaction. We found that, besides the bathochromic band shift, aggregation induces emissio

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9

Savjani, M., P. Draksharam, S. Arora, and AS Braverman. "MP4: MICROCYTOSIS IN PERNICIOUS ANEMIA WITHOUT IRON DEFICIENCY OR THALASSEMIA TRAIT." Journal of Investigative Medicine 64, no. 3 (2016): 806.1–806. http://dx.doi.org/10.1136/jim-2016-000080.16.

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Purpose of StudyTo demonstrate the presence and attributes of microcytes in Pernicious Anemia (PA) patients with high Red blood cell (RBC) distribution widths (RDW), but without iron deficiency or thalassemia trait. Marked macrocytosis is typical of PA, but their RDW are usually elevated (>21%).Methods Used Cases and MethodsWe report two patients with severe anemia, B12 deficiency, and elevated RDW's.Patient 1: 55 y/o African–American man, with dyspnea, finger paresthesias without gait disturbance. WBC 2.4 K/uL, Hb 4.8 g/dL, MCV 84.8 fL, RDW 30%, reticulocyte count 15 K/uL, iron 234 µg/dL,

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10

Faruk, Fırat Çalım, Karaca Nurullah, and Tacettin Türker Hakan. "Out-of-Plane Free Vibrations of Circular Rods." May 2, 2015. https://doi.org/10.5281/zenodo.1100877.

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In this study, out-of-plane free vibrations of a circular rods is investigated theoretically. The governing equations for naturally twisted and curved spatial rods are obtained using Timoshenko beam theory and rewritten for circular rods. Effects of the axial and shear deformations are considered in the formulations. Ordinary differential equations in scalar form are solved analytically by using transfer matrix method. The circular rods of the mass matrix are obtained by using straight rod of consistent mass matrix. Free vibrations frequencies obtained by solving eigenvalue problem. A computer

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11

Agham, Rahul D., and Ashish M. Mahalle. "Numerical investigation of heat exchanger pipe equipped with chamfered circular ring separated from wall to intensify thermo-hydraulic performance." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, January 27, 2022, 095765092210751. http://dx.doi.org/10.1177/09576509221075134.

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Chamfered circular ring (CCR) innovated from conventional circular ring by introducing chamfered surface on its periphery at 30o attack angle is numerically investigated to study its effect on fluid flow characteristics, heat transfer enhancement, and friction factor in a heat exchanger pipe. In order to study flow blockage effect on overall performance of device, three diameter ratios (DR = Di/Do = 0.6, 0.7 and 0.8) with three spacing ratios (SR = s/D = 1, 2 and 3) are used. Turbulent model k – ε, RNG with enhanced wall treatment is used to solve governing equations. Results showed that CCR c

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12

Li, Yifan, Junhao Liang, Shiwei Fu, et al. "Full‐color‐tunable chiral aggregation‐induced emission fluorophores with tailored propeller chirality and their circularly polarized luminescence." Aggregate, June 14, 2024. http://dx.doi.org/10.1002/agt2.613.

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AbstractThe regulation of emission color, emission efficiency, and asymmetry factor is of great significance for the real applications of circularly polarized luminescent (CPL) materials. Herein, we develop a modular synthetic strategy toward full‐color‐tunable CPL materials based on chiral macrocyclic aggregation‐induced emission (AIE) luminogens via delicate molecular engineering. Modular synthesis of chiral AIEgens with different acceptor moieties has afforded a series of bright solid emitters with tunable emission colors. These chiral cyclic AIEgens have retained high solid‐state emission

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13

Maeda, Chihiro, Issa Yasutomo, and Tadashi Ema. "Cyclic Azahelicene Dimers Showing Bright Circularly Polarized Luminescence and Selective Fluoride Recognition." Angewandte Chemie International Edition, May 9, 2024. http://dx.doi.org/10.1002/anie.202404149.

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Although helicenes are promising molecules, the synthetic difficulty and tediousness have often been problems, and only small amounts of optically pure helicenes have been obtained by using chiral HPLC in most cases. Herein, aza[7]helicenes or closed‐aza[7]helicenes with (1R)‐menthyl substituents were selectively synthesized via the intramolecular Scholl reaction, and the diastereomeric pairs were separated by silica gel column chromatography. The optically pure helicenes were further transformed into the corresponding cyclic dimers, and the chiroptical properties were investigated. The rigid

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14

Maeda, Chihiro, Issa Yasutomo, and Tadashi Ema. "Cyclic Azahelicene Dimers Showing Bright Circularly Polarized Luminescence and Selective Fluoride Recognition." Angewandte Chemie, May 9, 2024. http://dx.doi.org/10.1002/ange.202404149.

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Although helicenes are promising molecules, the synthetic difficulty and tediousness have often been problems, and only small amounts of optically pure helicenes have been obtained by using chiral HPLC in most cases. Herein, aza[7]helicenes or closed‐aza[7]helicenes with (1R)‐menthyl substituents were selectively synthesized via the intramolecular Scholl reaction, and the diastereomeric pairs were separated by silica gel column chromatography. The optically pure helicenes were further transformed into the corresponding cyclic dimers, and the chiroptical properties were investigated. The rigid

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15

Kanagasingam, Shalini, Christopher von Ruhland, Richard Welbury, and Sim K. Singhrao. "Antimicrobial, Polarizing Light, and Paired Helical Filament Properties of Fragmented Tau Peptides of Selected Putative Gingipains." Journal of Alzheimer's Disease, August 20, 2022, 1–13. http://dx.doi.org/10.3233/jad-220486.

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Background: Tau is an established substrate for gingipains secreted by Porphyromonas gingivalis. Hyperphosphorylation of tau and neurofibrillary tangle (NFT) formation is a defining lesion of Alzheimer’s disease (AD) where NFT distribution is related to Braak stage and disease severity. Objective: To assess gingipains’-fragmented tau peptides for their antimicrobial properties and for the likelihood of paired helical/straight filament (PHF/SF) formation with implications for the NFT lesion. Methods: Seven non-phosphorylated (A-G) and three phosphorylated (A-C) tau peptides, were tested for ant

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16

Bruce, Iain. "Fertile Ground in Hostile Lands." M/C Journal 27, no. 5 (2024). http://dx.doi.org/10.5204/mcj.3084.

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In this article, I will examine screenwriter Alex Garland's approach to world-building, with a particular focus on his screenplays Sunshine and Annihilation, exploring how Garland writes thematically for ‘genre’ stories and reflecting on the evolution of his world-building in his writing for film and television. The phrase ‘world-building’ conjures up images of physical settings and tangible places, but in a literary sense compelling world-building requires that a writer master their craft to create a landing for their readers in surprising new emotional and thematic spaces. Richard argues tha

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