Relevant bibliographies by topics / Conical assembly

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Conical assembly'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Conical assembly"

1

Pu, Xin Zheng. "Finite Element Analysis of Assembly Body of Conical Pick." Applied Mechanics and Materials 397-400 (September 2013): 573–76. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.573.

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In order to improve the structure mechanics performance of assembly body of conical pick, the finite element method was taken to analyse assembly body of conical pick based on rock cutting theory, and the distortion law of stress and displacement of carbide tip, pick arbor and pick holder were obtained. The results show that the maximum stress appearing in pick carbide tip and its weld site is 371MPa, maximum stress of pick holder appearing in its weld site is 157MPa. Consequently, the quality of the weld should be ensured in processing and manufacturing or welding installation to reduce the performance of carbide tip and pick holder drop. The maximum displacement of assembly body of conical pick is 1.14mm, which has little influence on the structure mechanics performance of assembly body. The research results could provide some guidance for designing, manufacturing or welding the assembly body of conical pick.
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2

Woodward, Cora L., Sarah N. Cheng, and Grant J. Jensen. "Electron Cryotomography Studies of Maturing HIV-1 Particles Reveal the Assembly Pathway of the Viral Core." Journal of Virology 89, no. 2 (November 12, 2014): 1267–77. http://dx.doi.org/10.1128/jvi.02997-14.

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ABSTRACTTo better characterize the assembly of the HIV-1 core, we have used electron cryotomography (ECT) to image infected cells and the viral particles cryopreserved next to them. We observed progressive stages of virus assembly and egress, including flower-like flat Gag lattice assemblies, hemispherical budding profiles, and virus buds linked to the plasma membrane via a thin membrane neck. The population of budded viral particles contains immature, maturation-intermediate, and mature core morphologies. Structural characteristics of the maturation intermediates suggest that the core assembly pathway involves the formation of a CA sheet that associates with the condensed ribonucleoprotein (RNP) complex. Our analysis also reveals a correlation between RNP localization within the viral particle and the formation of conical cores, suggesting that the RNP helps drive conical core assembly. Our findings support an assembly pathway for the HIV-1 core that begins with a small CA sheet that associates with the RNP to form the core base, followed by polymerization of the CA sheet along one side of the conical core toward the tip, and then closure around the body of the cone.IMPORTANCEDuring HIV-1 assembly and release, the Gag polyprotein is organized into a signature hexagonal lattice, termed the immature lattice. To become infectious, the newly budded virus must disassemble the immature lattice by proteolyzing Gag and then reassemble the key proteolytic product, the structural protein p24 (CA), into a distinct, mature hexagonal lattice during a process termed maturation. The mature HIV-1 virus contains a conical capsid that encloses the condensed viral genome at its wide base. Mutations or small molecules that interfere with viral maturation also disrupt viral infectivity. Little is known about the assembly pathway that results in the conical core and genome encapsidation. Here, we have used electron cryotomography to structurally characterize HIV-1 particles that are actively maturing. Based on the morphologies of core assembly intermediates, we propose that CA forms a sheet-like structure that associates with the condensed viral genome to produce the mature infectious conical core.
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Renner, Nadine, Donna L. Mallery, K. M. Rifat Faysal, Wang Peng, David A. Jacques, Till Böcking, and Leo C. James. "A lysine ring in HIV capsid pores coordinates IP6 to drive mature capsid assembly." PLOS Pathogens 17, no. 2 (February 1, 2021): e1009164. http://dx.doi.org/10.1371/journal.ppat.1009164.

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The HIV capsid self-assembles a protective conical shell that simultaneously prevents host sensing whilst permitting the import of nucleotides to drive DNA synthesis. This is accomplished through the construction of dynamic, highly charged pores at the centre of each capsid multimer. The clustering of charges required for dNTP import is strongly destabilising and it is proposed that HIV uses the metabolite IP6 to coordinate the pore during assembly. Here we have investigated the role of inositol phosphates in coordinating a ring of positively charged lysine residues (K25) that forms at the base of the capsid pore. We show that whilst IP5, which can functionally replace IP6, engages an arginine ring (R18) at the top of the pore, the lysine ring simultaneously binds a second IP5 molecule. Dose dependent removal of K25 from the pore severely inhibits HIV infection and concomitantly prevents DNA synthesis. Cryo-tomography reveals that K25A virions have a severe assembly defect that inhibits the formation of mature capsid cones. Monitoring both the kinetics and morphology of capsids assembled in vitro reveals that while mutation K25A can still form tubes, the ability of IP6 to drive assembly of capsid cones has been lost. Finally, in single molecule TIRF microscopy experiments, capsid lattices in permeabilised K25 mutant virions are rapidly lost and cannot be stabilised by IP6. These results suggest that the coordination of IP6 by a second charged ring in mature hexamers drives the assembly of conical capsids capable of reverse transcription and infection.
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Vinh, Le Quang, and Nguyen Manh Cuong. "Dynamic analysis of FG stepped truncated conical shells surrounded by Pasternak elastic foundations." Vietnam Journal of Mechanics 42, no. 2 (June 29, 2020): 133–52. http://dx.doi.org/10.15625/0866-7136/14749.

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This research presents a continuous element model for solving vibration problems of FG stepped truncated conical shells having various material properties and surrounded by Pasternak foundations. Based on the First Order Shear Deformation Theory (FSDT) and the equations of the FGM conical shells, the dynamic stiffness matrix is obtained for each segment of the shell having constant thickness. The interesting assembly procedure of continuous element method (CEM) is employed for joining those segments in order to analyze the dynamic behavior of the FG stepped truncated conical shells an assembly procedure of continuous element method (CEM) is employed for joining those segments. Free vibrations of different configurations of FG stepped truncated conical shells on elastic foundations are examined. Effects of structural parameters, stepped thickness and elastic foundations on the free vibration of FG stepped truncated conical shells are also presented.
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5

Zhang, Yiming, Jiqiang Tang, and Tong Wen. "A Modified Transfer Matrix Method for Modal Analysis of Stepped Rotor Assembly Applied in the Turbomolecular Pump." Shock and Vibration 2022 (February 27, 2022): 1–13. http://dx.doi.org/10.1155/2022/3692081.

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An accurate modal analysis of the stepped rotor assembly is significant in the design process of rotors. The transfer matrix method (TMM) is widely used in the modal analysis of the rotor. However, the influences of the step and the assembling modes are not considered in the traditional TMM. In this paper, a modified transfer matrix method is presented for the modal calculation of the rotor in the turbomolecular pump. The stiffness reduction of stepped segments and the effect of assembled components are considered in this modified method. First of all, the traditional transfer matrix model is built. Then, the stepped segments of the rotor are changed into conical segments and the lumped mass model of conical segments is calculated. Next, the conicities of conical segments are analyzed and relations between conicities and dimensions of the rotor are discovered. Finally, the stiffness factors which can describe the effects of different assembling modes are introduced and optimized. The optimized stiffness factors are analyzed and explained from the perspective of contact stress. The modal of the stepped rotor assembly could be computed with high accuracy by using this method.
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Lázaro, Guillermo R., Bogdan Dragnea, and Michael F. Hagan. "Self-assembly of convex particles on spherocylindrical surfaces." Soft Matter 14, no. 28 (2018): 5728–40. http://dx.doi.org/10.1039/c8sm00129d.

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Simulations and continuum theory of self-assembly of conical subunits around a spherocylindrical template show the tuning the template mean curvature, Gaussian curvature, and curvature anisotropy enables the controlled formation of a rich array of assembly geometries.
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Chen, Yan, and Li Bao An. "Simulation of Electric Field for Carbon Nanotube Assembly by Dielectrophoresis." Advanced Materials Research 941-944 (June 2014): 421–24. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.421.

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In the process of carbon nanotube assembly by dielectrophoresis, the geometry and spacing of electrodes are significantly affecting the assembly precision. In the simulation process, we showed the geometrical shape of conical, round and rectangular electrode and compared the electric field distribution with these electrodes. Compared with single electrode pairs, comb electrodes can achieve high-yield manipulation. Simulation results show that when the distance between adjacent electrode pairs is larger than twice electrode width, it will avoid electric field superimposition. A method of using floating metal posts within the electrode gap can realize precise positioning of assembled carbon nanotubes.
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Belarifi, Farid, and E. Bayraktar. "The Tredgold Method in Reverse Engineering to Check the Assembly of a Conical Spur Gear Using CAD." Advanced Materials Research 264-265 (June 2011): 1598–603. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1598.

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Defining and generating a working drawing of a conical spur gear to replace an original piece requires geometrical and dimensional constraints, especially when the cutting module is determined by reverse engineering. We propose an approach using Computer aided design (CAD) to establish the drawing definitions and to verify the assembly of the conical spur gear. We have developed the model drawing according to the standard International Standard Organisation (ISO), in which we introduce a new non-existent coast into the current dimensioning and check the assembly using the Tredgold method, which transforms a conical spur gear into a model cylindrical spur gear, to which the equations for parallel cylindrical gearing can be applied. This method determines a good estimate if the couple of gear verifies the specified geometrical conditions of assemblies. We present the developed algorithms, as well as the results of applications of various programs.
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Lepoitevin, Mathilde, Bastien Jamilloux, Mikhael Bechelany, Emmanuel Balanzat, Jean-Marc Janot, and Sebastien Balme. "Fast and reversible functionalization of a single nanopore based on layer-by-layer polyelectrolyte self-assembly for tuning current rectification and designing sensors." RSC Advances 6, no. 38 (2016): 32228–33. http://dx.doi.org/10.1039/c6ra03698h.

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von Schwedler, Uta K., Kirsten M. Stray, Jennifer E. Garrus, and Wesley I. Sundquist. "Functional Surfaces of the Human Immunodeficiency Virus Type 1 Capsid Protein." Journal of Virology 77, no. 9 (May 1, 2003): 5439–50. http://dx.doi.org/10.1128/jvi.77.9.5439-5450.2003.

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ABSTRACT The human immunodeficiency virus type 1 initially assembles and buds as an immature particle that is organized by the viral Gag polyprotein. Gag is then proteolyzed to produce the smaller capsid protein CA, which forms the central conical capsid that surrounds the RNA genome in the mature, infectious virus. To define CA surfaces that function at different stages of the viral life cycle, a total of 48 different alanine-scanning surface mutations in CA were tested for their effects on Gag protein expression, processing, particle production and morphology, capsid assembly, and infectivity. The 27 detrimental mutations fall into three classes: 13 mutations significantly diminished or altered particle production, 9 mutations failed to assemble normal capsids, and 5 mutations supported normal viral assembly but were nevertheless reduced more than 20-fold in infectivity. The locations of the assembly-defective mutations implicate three different CA surfaces in immature particle assembly: one surface encompasses helices 4 to 6 in the CA N-terminal domain (NTD), a second surrounds the crystallographically defined CA dimer interface in the C-terminal domain (CTD), and a third surrounds the loop preceding helix 8 at the base of the CTD. Mature capsid formation required a distinct surface encompassing helices 1 to 3 in the NTD, in good agreement with a recent structural model for the viral capsid. Finally, the identification of replication-defective mutants with normal viral assembly phenotypes indicates that CA also performs important nonstructural functions at early stages of the viral life cycle.
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Dissertations / Theses on the topic "Conical assembly"

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Шудрик, Олександр Леонідович. "Підвищення ефективності використання відцентрових насосів за рахунок вдосконалення математичних моделей робочого процесу." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35499.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018 р. Дисертацію присвячено вирішенню важливої науково-технічної задачі підвищення ефективності роботи заглибного електровідцентрового насоса при його роботі на реальній рідині, що представляє собою суміш в'язкої неньютонівської рідини, води та газу, за рахунок вдосконалення математичних моделей. Виконано аналіз концепцій розвитку насособудування в Україні. Описано методи математичного моделювання тривимірних течій в'язкої реальної рідини та їх переваги над фізичними експериментами. Обрано пакет програм для проведення чисельного експерименту в каналах заглибних насосів OpenFOAM. Для моделювання течії рідини в проточній частині насоса використовувалась система рівнянь нерозривності та Навье-Стокса. Для її замикання було обрано k-ε модель турбулентності. Досліджено вплив реологічних властивостей неньютонівських рідин на характеристики відцентрового насоса. Наведено математичну модель турбулентної тривимірної течії неньютонівської рідини. Для розрахунків обрано модель неньютонівської рідини Гершеля-Балклі, що найбільш точно описує поведінку рідин даного типу. Вдосконалено залежності для перерахунку характеристик насосу при його роботі на реальній рідині. Визначено та обрано підхід та математичну модель для моделювання тривимірної течії в'язкої газорідинної суміші та показані особливості при розрахунках такого типу рідин в пакеті OpenFOAM. Розглянуто шляхи підвищення ефективності заглибних насосів шляхом зміни проточної частини. Визначено раціональний кут нахилу вихідної кромки. Запропоновано модифіковану ступінь насоса, котра захищена патентом України, для перекачування рідини з підвищеним вмістом газу. Розглянуто та вдосконалено математичну модель сумісної роботи реальної свердловини та заглибного відцентрового насоса у вигляді пакета прикладних програм. Це дало змогу визначати основні фізичні характеристики рідини в залежності від термодинамічних умов.
Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.05.16 – Hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Politechnic Institute", 2018. The dissertation is devoted to the solution of an important scientific and technical problem of increasing the efficiency of a submersible electric centrifugal pump when it operates on a real liquid, which is a mixture of viscous non-Newtonian fluid, water and gas by improving mathematical models. An analysis of the concepts of development of pumping plant in Ukraine is carried out. The methods of mathematical modeling of three-dimensional flows of a viscous real liquid and their advantages over physical experiments are described. Selected software package for numerical experiment in OpenFOAM submersible pump channels. A system of indeterminate and Navier-Stokes equations was used to simulate the flow of fluid in the flow section of the pump. For its closure a k-ε turbulence model was chosen. The influence of rheological properties of non-Newtonian fluids on the characteristics of a centrifugal pump is investigated. The mathematical model of the turbulent three-dimensional flow of the non-Newtonian fluid is given. For calculations, a model of the Herschel-Bulkley non-Newtonian fluid is chosen, which most accurately describes the behavior of liquids of this type. The dependencies for the recalculation of the characteristics of the pump during its operation on the real liquid have been improved. The approach and mathematical model for modeling the three-dimensional flow of a viscous gas-liquid mixture are determined and chosen, and features are shown in the calculations of this type of fluid in the OpenFOAM package. The ways of increasing the efficiency of submersible pumps by changing the flow part are considered. The rational angle of inclination of the initial edge is determined. The modified degree of the pump, protected by the Ukrainian patent, is offered for pumping a liquid with an increased gas content. The mathematical model of a compatible operation of a real well and a submersible centrifugal pump in the form of a package of applied programs is considered and improved. This made it possible to determine the basic physical characteristics of the liquid, depending on the thermodynamic conditions.
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2

Шудрик, Олександр Леонідович. "Підвищення ефективності використання відцентрових насосів за рахунок вдосконалення математичних моделей робочого процесу." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35496.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018 р. Дисертацію присвячено вирішенню важливої науково-технічної задачі підвищення ефективності роботи заглибного електровідцентрового насоса при його роботі на реальній рідині, що представляє собою суміш в'язкої неньютонівської рідини, води та газу, за рахунок вдосконалення математичних моделей. Виконано аналіз концепцій розвитку насособудування в Україні. Описано методи математичного моделювання тривимірних течій в'язкої реальної рідини та їх переваги над фізичними експериментами. Обрано пакет програм для проведення чисельного експерименту в каналах заглибних насосів OpenFOAM. Для моделювання течії рідини в проточній частині насоса використовувалась система рівнянь нерозривності та Навье-Стокса. Для її замикання було обрано k-ε модель турбулентності. Досліджено вплив реологічних властивостей неньютонівських рідин на характеристики відцентрового насоса. Наведено математичну модель турбулентної тривимірної течії неньютонівської рідини. Для розрахунків обрано модель неньютонівської рідини Гершеля-Балклі, що найбільш точно описує поведінку рідин даного типу. Вдосконалено залежності для перерахунку характеристик насосу при його роботі на реальній рідині. Визначено та обрано підхід та математичну модель для моделювання тривимірної течії в'язкої газорідинної суміші та показані особливості при розрахунках такого типу рідин в пакеті OpenFOAM. Розглянуто шляхи підвищення ефективності заглибних насосів шляхом зміни проточної частини. Визначено раціональний кут нахилу вихідної кромки. Запропоновано модифіковану ступінь насоса, котра захищена патентом України, для перекачування рідини з підвищеним вмістом газу. Розглянуто та вдосконалено математичну модель сумісної роботи реальної свердловини та заглибного відцентрового насоса у вигляді пакета прикладних програм. Це дало змогу визначати основні фізичні характеристики рідини в залежності від термодинамічних умов.
Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.05.16 – Hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Politechnic Institute", 2018. The dissertation is devoted to the solution of an important scientific and technical problem of increasing the efficiency of a submersible electric centrifugal pump when it operates on a real liquid, which is a mixture of viscous non-Newtonian fluid, water and gas by improving mathematical models. An analysis of the concepts of development of pumping plant in Ukraine is carried out. The methods of mathematical modeling of three-dimensional flows of a viscous real liquid and their advantages over physical experiments are described. Selected software package for numerical experiment in OpenFOAM submersible pump channels. A system of indeterminate and Navier-Stokes equations was used to simulate the flow of fluid in the flow section of the pump. For its closure a k-ε turbulence model was chosen. The influence of rheological properties of non-Newtonian fluids on the characteristics of a centrifugal pump is investigated. The mathematical model of the turbulent three-dimensional flow of the non-Newtonian fluid is given. For calculations, a model of the Herschel-Bulkley non-Newtonian fluid is chosen, which most accurately describes the behavior of liquids of this type. The dependencies for the recalculation of the characteristics of the pump during its operation on the real liquid have been improved. The approach and mathematical model for modeling the three-dimensional flow of a viscous gas-liquid mixture are determined and chosen, and features are shown in the calculations of this type of fluid in the OpenFOAM package. The ways of increasing the efficiency of submersible pumps by changing the flow part are considered. The rational angle of inclination of the initial edge is determined. The modified degree of the pump, protected by the Ukrainian patent, is offered for pumping a liquid with an increased gas content. The mathematical model of a compatible operation of a real well and a submersible centrifugal pump in the form of a package of applied programs is considered and improved. This made it possible to determine the basic physical characteristics of the liquid, depending on the thermodynamic conditions.
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3

Peng, Jinh-Jhih, and 彭敬之. "Assembly Errors Analysis and Tooth Surface Fatigue Experiment of Concave Conical Gear Pairs on Intersecting Axes." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/46727672501123682035.

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碩士
國立中央大學
機械工程研究所
100
Conical gear has many advantage to be applied in the power transmission such as easy manufacturing, multiple assembly and low assembly sensitivity. Because its tooth thickness varies with the face-width, the contact pattern of a conical gear pair is point contact. Therefore, the flank surface would be failed due to a large contact stress under heavy loading. Some research works have been proposed to solve this problem. One of the methods is flank modification on conical gears to lower the contact stress. The conventional method is applied with a circular path as longitudinal modification path, however some research works have shown that hyperbolic path is better than circular path for flank modification. The aim of the thesis is to continue a theoretical research of concave conical gear on different quadratic modification path by using experimental method. Spur-conical gear pairs with three different types of flank modification, i.e. non-modified, circular and hyperbolic path, are analyzed in the thesis to explore the influences of assembly errors and tooth surface durability experimentally. First the contact patterns of the different modified gear pairs were measured on a universal single flank testing machine under angular and offset assembly errors. Then their tooth surface fatigue types were observed and recorded by conducting a loaded failure running test on a test rig. The experimental results show that the contact pattern of the gear pairs with modified flanks would become approximate line contact. However, they tends easily to edge contact due to assembly errors. And serious scuffing failure are also found in the near of the edge of the face-width on a long-term running test.
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Books on the topic "Conical assembly"

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Ovtov, Vladimir. Machine parts. Course design. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1171976.

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The textbook discusses the methodology of course design of general-purpose drives with a single-stage gearbox (cylindrical, conical and worm) and a V-belt or chain transmission. The procedure for calculating gears and constructing assembly drawings of gearboxes is shown, the development of specifications using the COMPASS-3D computer-aided design system is described. Examples of the design of drawings of the general type of the drive, assembly drawings of gearboxes and working drawings of parts of various types of gearboxes are given. Meets the requirements of the federal state educational standards of higher education of the latest generation. It is intended for independent work of students of engineering specialties studying in the bachelor's degree and specialty.
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Book chapters on the topic "Conical assembly"

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Gray, Derek G., and Maren Roman. "Self-Assembly of Cellulose Nanocrystals: Parabolic Focal Conic Films." In ACS Symposium Series, 26–32. Washington, DC: American Chemical Society, 2006. http://dx.doi.org/10.1021/bk-2006-0938.ch003.

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Li, Yongnan. "Encryption and Decryption in Conic Curves Cryptosystem Over Finite Field $$GF(2^n)$$ Using Tile Self-assembly." In Parallel Architectures, Algorithms and Programming, 150–61. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0010-4_14.

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Renane, Rachid, Rachid Allouche, Oumaima Zmit, and Bouchra Bouchama. "Aero Heating Optimization of a Hypersonic Thermochemical Non-Equilibrium Flow around Blunt Body by Application of Opposing Jet and Blunt Spike." In Hypersonic Vehicles - Applications, Recent Advances, and Perspectives [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101659.

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The goal of this work is to give optimum aerothermal solutions for thermal protection of the nose wall of space shuttles during atmospheric reentry, where the air flow is hypersonic, nonequilibrium reactive flow (vibrational and chemical) behind detached shock waves, it’s governed by Navier–Stokes equations with chemical reaction source terms, and modelled using five species (N2, O2, NO, N, O) and Zeldovich chemical scheme with five reactions. This study which simulates the flow using the software Fluent v.19 focuses on the comparison between three protection techniques based on the repulsion of the shock wave, the first is geometric, it consists in introducing a spike that makes the right shock move away from the nose of the shuttle, this allows the endothermic physicochemical processes of dissociation and ionization to absorb heat, the second technique is based on an opposite jet configuration in the frontal region of the nose, this jet allows to push the strong shock, and consequently reduce the heat released, the last technique is the assembly of the two previous techniques; Jets nearby the spike noses were set up in front of the blunt body to reconfigure the flow field and reduce aerodynamic overheating. The opposing jet model reduces the heat at the nose by 12.08% compared to the spike model and by 20.36% compared to the spike jet model. The flow field reconfiguration was the most important factor in heat reduction, according to the quantitative analysis, a combination parameter was given as the main criterion for designing spiked bodies with opposing jets for the goal of heat reduction based on the locations of the reattached shock and its interaction with the conical shock. The results obtained are in good agreement with the specialized literature.
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Taber, Douglass F. "Diels–Alder Cycloaddition: Pancratistatin (Cho), Nootkatone (Reddy), Platensimycin (Zhang/Lee), Scabronine G (Nakada), Isoglaziovianol (Trauner)." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0077.

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Samuel J. Danishefsky of Columbia University and the Memorial Sloan-Kettering Cancer Center made (Proc. Natl. Acad. Sci. 2013, 110, 10904) the unexpected obser­vation that methylation of the enolate derived from conjugate addition to the readily-prepared 1 followed by intramolecular alkene metathesis led to the trans fused ketone 2. This can be contrasted to the diastereo- and regioisomer 3, the product from Diels-Alder cycloaddition of 2-methylcyclohexenone to isoprene. The trans ring fusion of 2 is particularly significant because ozonolysis followed by aldol condensation would deliver the angularly-methylated trans-fused 6/5 C–D ring system of the steroids and related natural products. Cheon-Gyu Cho of Hanyang University added (Org. Lett. 2013, 15, 5806) the activated dienophile 4 to the dienyl lactone to give, after oxidation, the dibro­mide 5. Debromination followed by oxidation led to the antineoplastic lactam pancratistatin 6. D. Srinivasa Reddy of CSIR-National Chemical Laboratory Pune devised (J. Org. Chem. 2013, 78, 8149) a cascade protocol of Diels-Alder cycloaddition of 8 to the diene 7, followed by intramolecular aldol condensation, to give the enone 9. Oxidative manipulation followed by methylenation completed the synthesis of the commercially important grapefruit flavor nootkatone 10. Xinhao Zhang and Chi-Sing Lee of the Peking University Shenzen Graduate School uncovered (J. Org. Chem. 2013, 78, 7912) another cascade transformation, intermolecular addition of 11 to 12 followed by intramolecular Conia-ene cyclization, to give the tricyclic 13. Further manipulation led to an established intermediate for the total synthesis of platensimycin 14. Masahisa Nakada of Waseda University prepared (Angew. Chem. Int. Ed. 2013, 52, 7569) the enantiomerically-pure allene 15. Oxidation of the phenol to the monoketal of the cyclohexadienone set the stage for intramolecular cycloaddition to give 16. Oxidative cleavage followed by intramolecular alkene metathesis led to (+)-scabronine G 17. Dirk Trauner of the University of Munich assembled (Org. Lett. 2013, 15, 4324) the enantiomerically-pure alcohol 18. Oxidation gave the quinone, leading to intra­molecular Diels–Alder cycloaddition. The free alcohol then added to the exocyclic alkene of that product, to give, after further oxidation, the ether 19. Deprotection fol­lowed by reduction then completed the synthesis of (−)-isoglaziovianol 20.
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Conference papers on the topic "Conical assembly"

1

Casaletti, Massimiliano, Enrica Martini, and Stefano Maci. "Field expansions in terms of conical and localized beams." In 2011 XXXth URSI General Assembly and Scientific Symposium. IEEE, 2011. http://dx.doi.org/10.1109/ursigass.2011.6050363.

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Sigoli, Paulo Cesar, Mauro Moraes de Souza, Juliano Savoy, and Marcelo Adriano do Carmo Silva. "An Innovative Solution to Assembly Conical Roller Bearings on Wheel Hubs." In SAE Brasil 2010 Congress and Exhibit. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2010. http://dx.doi.org/10.4271/2010-36-0471.

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Rajappan., Rakhil Krishnan, and K. Sunil Kumar. "Structural optimization of conical panel assembly for grid-stiffened launch vehicle structure." In PROCEEDINGS OF THE INTERNATIONAL ENGINEERING RESEARCH CONFERENCE - 12TH EURECA 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5120233.

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Ozawa, Mamoru, R. Matsumoto, K. Matsui, and T. Ishikawa. "CONVECTION PATTERN TRANSITION IN AN ANNULAR GAP AROUND A TRUNCATED CONICAL ROTOR IN A CIRCULAR CYLINDER." In Annals of the Assembly for International Heat Transfer Conference 13. Begell House Inc., 2006. http://dx.doi.org/10.1615/ihtc13.p20.160.

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Ivashina, M. V., R. Bradley, R. Gawande, M. Pantaleev, B. Klein, J. Yang, and C. Bencivenni. "System noise performance of ultra-wideband feeds for future radio telescopes: Conical-Sinuous Antenna and Eleven Antenna." In 2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS). IEEE, 2014. http://dx.doi.org/10.1109/ursigass.2014.6930063.

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Haykir, Yigit, Aydoga Kallem, and Simsek Demir. "Compact and Directional Printed Dipole Antenna Pair Conformed on a Conical Surface." In 2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2021. http://dx.doi.org/10.23919/ursigass51995.2021.9560252.

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7

Nyatando, Rose, Jian Ding, and Edward J. Williams. "Study of a Conical Coupling for Torque Transmission." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59493.

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A study has been conducted on the design of a conical coupling joint in which torque is transmitted by frictional contact across conical surfaces on the flanges. Three dimensional finite element analyses were undertaken on the coupling, employing a full 360-degree model along with more detailed analytical studies using a representative cyclic symmetry model. Parametric studies were done on a number of geometries where investigations were made with the aim of improving the pressure distributions and values in the contact region, while working towards maximizing the torque capacity on the joint. The results showed that the torque capacity is strongly dependent on the angle of the conical surface. A 0.5° angular variation between two contacting conical surfaces provided an increase in contact area and a significant reduction in the contact pressure peaks. As part of the study on the design improvement, the potential effects of manufacturing variations were investigated and results showed that variations of ±0.25° should not significantly affect the assembly accuracy. A parallel experimental study of a prototype joint was also undertaken. Measured torque capacity on the prototype was in good agreement with values predicted by the finite element models.
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Golabi, Sa’id, Kazem Abhary, and Lee H. S. Luong. "A Technique for Planar Contact Recognition in Automatic Assembly Planning." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/dfm-1416.

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Abstract Recognition of all assembly sequences and selection of the most efficient one have been the main concerns of researchers in assembly planning during the last decade. Few of these researchers attempted to automatically generate assembly sequences using the geometric and solid model data of the product. To solve the problem of contact recognition a broad research was conducted to recognise contact between planar, cylindrical and conical faces during this research. This paper explains one of the techniques developed herein to recognise contact between two planar faces. The necessary geometrical data of a solid model has been extracted from AutoCAD. The method includes new approaches for detecting a point within the solid part of a face, and investigating the intersection of two curved edges.
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Azzouz, M. Salim, Anjolajesu Fagbe, Zachary Evetts, and Ethan Rosales. "Active Conical and Planetary Gearing System for Wind Turbines." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86430.

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The purpose of this research project is to explore the possibility of harvesting the energy of the wind by taking advantage of higher wind speeds. Two active gearbox systems allowing a variable speed at the input shaft and delivering a constant speed at the output shaft are currently being built and tested. The first system consists of an assembly of spur, planetary, and ring gears run and controlled by electrical motors. The second system consists of an assembly of a conical shaft, a wheel, and a set of centrifugal masses. The two gearing systems can act separately as a continuously variable transmission (CVT) between the wind turbine hub and the electricity generator which requires an entry speed corresponding to a frequency of 60 Hz. The two gearing systems are designed using the SolidWorks CAD software for modeling and simulation, and the gearing design theory is used to dimension the required spur, planetary and ring gears for the first proposed system. Betz’s law associated with appropriate and realistic wind turbine efficiency is used to estimate the wind power transferred to the turbine hub. The law is also used to determine the hub angular speed as a function of the wind speed. The kinematic gearing theory is used to establish the different gearing ratios of the planetary system, and the kinematic relationships between the system stages. The forces and torques acting on the first and the second systems are computed using the equilibrium equations. The speed ratios are calculated for the first and second system using the kinematic theory. Ideally, the electrical power consumed by the regulating motor for the first system is minimal so that a maximum percentage of the generated electrical power is supplied to the electricity grid. For the second system the totality of the harvested power is transmitted through the conical/wheel system. For the planetary system, when the wind speed deviates from a certain optimum value, the electrical controls activate a regulating motor to guarantee that the generator input speed remains constant. Currently, a prototype of a more robust planetary gearing system than a previously made one is under construction while a newly constructed conical system is under experimental testing. Running speeds, torques, power transfer and distribution for the two systems will be measured. The generated electrical power is measured using different load resistances and compared to the electrical power consumed by the regulating motor for the planetary system. The torques are measured using a prony brake system while the angular speeds are measured using tachometers. It is expected that the power consumed by the regulating motor for the gearing system will remain a small percentage of the power supplied to the grid for various hub input speeds.
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Kovitz, Joshua M., Vignesh Manohar, and Yahya Rahmat-Samii. "A spline-profiled conical horn antenna assembly optimized for deployable Ka-band offset reflector antennas in CubeSats." In 2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2016. http://dx.doi.org/10.1109/aps.2016.7696474.

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