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Статті в журналах з теми "Strcutures"
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He, Boling, Yuwei Lu, and Yupeng Liu. "Flexural behavior of CFRP-aluminum fuselage frames with bolted splice joints." Journal of Physics: Conference Series 2342, no. 1 (September 1, 2022): 012002. http://dx.doi.org/10.1088/1742-6596/2342/1/012002.
Повний текст джерелаАнотація:
Abstract Few work concerned on the flexural strength of carbon fiber reinforced plastic (CFRP)-aluminum fuselage frames with bolted splice joints used in aeronautical industry. To provide help for the design of CFRP aircraft strcutures, this paper investigated the flexural behavior of CFRP-aluminum fuselage frames with bolted splice joints experimentally. Firstly, CFRP-aluminum fuselage frames were fabricated with mid-span bolted splice joints. The joints comprised: reinforced or unreinforced aluminum splice plates bolted to the fuselage frames. The bolt diameters were 4.76mm and 6.35mm. Then, the effects of splice plate and bolt dimeter on flexural behavior of CFRP-aluminum fuselage frames with bolted splice joints were investigated through four-point bending test. It has been shown that the introduction of reinforced splice plate improves the structural load capacity. However, increasing bolt diameter lowers the flexural strength of CFRP-aluminum fuselage frames with bolted splice joints. This splice jointed structure is a representative part of the rear fuselage, and the experimental results will be commonly instructive for the the aeronautical CFRP joining applications.
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Liu, De Zheng, Qiang Xu, Zhong Yu Lu, Dong Lai Xu, and Feng Tan. "The Validation of Computational FE Software for Creep Damage Mechanics." Advanced Materials Research 744 (August 2013): 205–10. http://dx.doi.org/10.4028/www.scientific.net/amr.744.205.
Повний текст джерелаАнотація:
The preliminary validation of in-house finite element analysis software for creep damage mechanics is reported. The Finite Element Analysis Method and the programme strcuture for creep damage problem were reported elsewhere and the validation conducted so far include plane stress, plane strain, and axisymmetric cases. Furture work is also outlined.
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木再, 帕尔. "The Place of Head Words in Several Phrase Strcuture." Modern Linguistics 08, no. 04 (2020): 517–25. http://dx.doi.org/10.12677/ml.2020.84071.
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Shopina, I., and V. Volovyk. "DEFINITION, FEATURES AND STRCUTURE OF THE LEGAL CULTURE OF SERVICEMEN." Visnyk Taras Shevchenko National University of Kyiv. Military-Special Sciences, no. 2 (44) (2020): 47–49. http://dx.doi.org/10.17721/1728-2217.2020.44.47-49.
Повний текст джерелаАнотація:
The article is dedicated to determining the definition, features and structure of the legal culture of servicemen.The definition of the legal culture of a serviceman is presented as a complex of judicial values, abilities and skills whichaltogether determine his legal behavior.There’re arguments provided in favor of the idea that the culture of servicemen happens to have the following features: a) avariety of the general culture of the serviceman which happens to develop in the course nurturing within the family and the initialsocialization in the system of common middle-professional education; b) is characterized by a number of layers and consists ofthe legal culture of the citizen, which includes the legal culture of a serviceman and which in its turn consists of the legal cultureof a cadet, officers, sergeants and non-commissioned officers and privates etc; c) has influence on both the behavior of theserviceman, but also the existing overall level of legal culture of military entities.Based on the analyses of the elements of the legal culture of the serviceman it was possible to determine the followingelements of its structure: а) the theoretic-legal culture (doctrinal knowledge with regard to the essence and the peculiarities oflaw, the legal norm, state, rights and freedoms of the individual and other legal phenomena, that indirectly influence the socialrelations in a state and determine the content of the generic and special legislation); b) the military-legal culture (knowledge inthe field of military law, abilities and skills in terms of his implementation in different situations in the line of duty); c) theinformational-legal culture (the complex of knowledge, abilities and skills of legally just behavior in informational relations). Itincludes a pretty broad spectrum of elements – starting with the behavior of the servicemen on the social media and finishes withthe protection of personal data of one’s subordinates; d) the linguistic-legal culture ( the complex of knowledge, ability and skills,which allow to freely operate with the foreign military terminology, including the one that is implemented in administrative,operative, and NATO material-technical standards; e) the pedagogical-legal culture (the complex of special methods and meansto develop knowledge, abilities and skills, value orienteers and persuasions based on the realization of the rule of law among thesubordinates and other servicemen).
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Oetomo, Repelita Wahyu, and Heddy Surachman. "Sisa Struktur Bangunan di Samudera Pasai (Tinjauan Konstruksi dan Fungsinya)." Berkala Arkeologi Sangkhakala 15, no. 1 (January 5, 2018): 142. http://dx.doi.org/10.24832/bas.v15i1.141.
Повний текст джерелаАнотація:
AbstractAs a centre of administration, Samudera Pasai must have archaeological remains ofbuildings. The fact, however, shows very few data except tombs. Recently,information of a strcuture remain has come into existence. It is predicted to be asurrounding wall of a bulding inside.AbstrakSebagai sebuah pusat pemerintahan, Samudera Pasai seharusnya memiliki tinggalanarkeologis berupa bangunan. Namun sampai sejauh ini belum banyak data bangunanditemukan di Pasai, selain makam. Belakangan didapatkan informasi adanya strukturbangunan. Diperkirakan struktur bangunan tersebut adalah merupakan tembokkeliling dari sebuah bangunan di dalamnya
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Amiruddin, Amiruddin, Candra Kurniawan, Eka Hero Ramadhani, and Julio Rinaldi. "Learning the Basic Strcuture of Several Ransomwares Using Static Analysis Tecgnique." IOP Conference Series: Materials Science and Engineering 1007 (December 31, 2020): 012072. http://dx.doi.org/10.1088/1757-899x/1007/1/012072.
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HUANG, DAMING, MICHAEL A. RESHCHIKOV, and HADIS MORKOÇ. "GROWTH, STRUCTURES, AND OPTICAL PROPERTIES OF III-NITRIDE QUANTUM DOTS." International Journal of High Speed Electronics and Systems 12, no. 01 (March 2002): 79–110. http://dx.doi.org/10.1142/s0129156402001137.
Повний текст джерелаАнотація:
This article reviews the advances in the growth of III-nitride quantum dots achieved in the last few years and their unique properties. The growth techniques and the strcutural and optical properties associated with quantum confinement, strain, and polarization in GaN/Al x Ga 1-x N and In x Ga 1-x N/GaN quantum dots are discussed in detail.
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Murch, Graeme E., Irina V. Belova, and H. Zhang. "Collective Correlation Factors in the Ising Ordered Alloy with the B2 Strcuture." Defect and Diffusion Forum 136-137 (March 1996): 1–20. http://dx.doi.org/10.4028/www.scientific.net/ddf.136-137.1.
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Zhao, Li Ping, Wen Hong Tao, Xing Hua Fu, Wen Zhe Cao, Guo Yuan Cheng, and Wen Xin Ma. "The Influence of Mn Doping on the Dielectric Properties of Ba0.5Sr0.5TiO3 Ceramics." Materials Science Forum 859 (May 2016): 18–23. http://dx.doi.org/10.4028/www.scientific.net/msf.859.18.
Повний текст джерелаАнотація:
(Ba0.5Sr0.5)1-xMnxTiO3(x=0,0.01,0.03,0.05)ceramics were prepared via a new sol-gel method with titannium oxide, strontium nitrate, barium nitrate and manganous nitrate as raw materials.The effect of Mn doping on the microstructure and dielectric properties of the BST were characterized by field scanning electron microscopy,x-ray diffraction and impedance analyser.It was found that the dopted ions could not alter the basic crystal strcuture and they only improved the material properties as modified ions when x≤0.3.The (Ba0.5Sr0.5)1-xMnxTiO3 ceramics sintered at 1250°C for 2h exhibited good dielectric properties(er=1330,tand=0.03)at room temperature and f=1KHz when x=0.03 and the grains were regular and uniform ,indicating a dense microstrcture.
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Carol, Seika, and Jonnardi Jonnardi. "FAKTOR YANG MEMPENGARUHI STRUKTUR MODAL PADA PERUSAHAAN MANUFAKTUR YANG TERDAFTAR DI BEI." Jurnal Paradigma Akuntansi 5, no. 3 (July 15, 2023): 1419–26. http://dx.doi.org/10.24912/jpa.v5i3.25256.
Повний текст джерелаАнотація:
The purpose of this research is to examine the influence of profitability, firm size and liquidity to capital structure on manufacture company that registered on Indonesia Stock Exchange in period of 2016-2020. Then based on simple random sampling that used in this research This research is conducted by using 49 company industry that registered on Indonesia Stock Exchange as sample have been discovered. The data source of the research is the secondary data obtained not direct. Data analysis was performed with descriptive statistics. The results of this research shows that profitability had a positive and significant effect to capital structure companies, firm size had no siginifcant to capital structure, and liquidity had a negative and significant effect to capital strcuture companies.
Дисертації з теми "Strcutures"
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Yan, Zhihao, and 阎志浩. "Nonlinear dynamic analysis and strcutural identification of frames." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43224076.
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Yan, Zhihao. "Nonlinear dynamic analysis and strcutural identification of frames." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43224076.
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Charrier, Giraldo Nieto Carmenza. "L'apport de la cour de justice à l'évolution de la strcuture institutionnelle des communautés européennes." Tours, 1996. http://www.theses.fr/1996TOUR1004.
Повний текст джерелаАнотація:
La cour de justice des communautes europeennes, fidele a l'esprit et a la lettre des traites fondateurs a defini les conditions de l'equilibre institutionnel et etabli un systeme complet de protection juridique. Elle clarifia le processus decisionnel en identifiant une fonction legislative innomee dans les traites et fit apparaitre l'interaction institutionnelle comme base de l'equilibre entre le legislatif et l'executif. Elle delimita le role respectif des institutions et son exigence d'une plus grande transparence retablit la commission et le parlement dans leurs fonctions. La generalisation de la justiciabilite des actes des insitutions, l'elaboration du statut contentieux du parlement europeen et l'elargissement du droit de recours des particuliers contre les actes des autorites nationales caracteriserent une communaute de droit. La cour de justice conforta encore le poids du droit communautaire derive face aux droits nationaux tout en developpant une collaboration avec les juridications nationales qui participerent a l'integration du droit communautaire dans leurs systemes juridiquesRespectful of the ethos as well as of the provisions of the founder treaties, the e. C. J. Defined the institutional "checks and balances" and established a whole system of protection under community law. The court of justice has defined the respective roles of the institutions and through its demand for greater transparency, has reasserted the attributions of both the commission and the european parliament. Generalizing judicial review to all decisions of the community organs, developing a contentious status to the european parliament and guaranteeing the effectiveness of the legal protection of individuals rights are the ways chosen by the court of justice to assert the european community as a community based on the rule of law (communaute de droit)
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Biguri, Pastor Kizkitza. "Essays in corporate finance." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/387423.
Повний текст джерелаАнотація:
La presente tesis estudia como las decisiones de estructura de deuda y de cobertura de riesgo de las empresas afectan a su nivel de inversión en activo fijo. En primer capítulo se centra en construir hechos estilizados sobre la relación entre la estructura de deuda, la estructura de capital y la inversión cuando las empresas pueden acceder tanto a deuda segura (con avales) como a deuda insegura (sin avales). Los resultados sugieren que i) las empresas con mayor calidad crediticia tienen a tomar prestado más en términos de deuda insegura, ii) una mayor capacidad de la empresa de ofrecer avales no necesariamente implica una mayor inversión y iii) las empresas que dependen más de la deuda insegura en su estructura de deuda, pueden llevar a cabo una mayor inversión en activo fijo.
El segundo capítulo utiliza dos estrategias de identificación distintas para testar el efecto causal de los hechos estilizados derivados del capítulo uno. Testeo la hipótesis desde la perspectiva del canal de balance y crédito. Los resultados sugieren que la composición de la estructura de deuda tiene efecto sobre las variables reales. Cuanto mayor es la presencia de la deuda insegura en la estructura de deuda de las empresas, las empresas tienden a invertir más. La explicación más plausible para este resultado es que la deuda insegura es más efectiva en términos de costes; tanto en tipos de interés como en cláusulas contractuales (covenants).
Por último, el tercer capítulo utiliza un panel de perturbaciones al coste de la cobertura mediante derivados en distintos momentos de tiempo para estudiar la relación entre la cobertura y el riesgo idiosincrático. Hago uso de las introducciones y eliminaciones de derivados sobre commodities por parte del Chicago Mercantile Exchange y otros mercados pos este motivo. Los resultados sugieren que un acceso más barato a instrumentos derivados reduce la volatilidad de los flujos de caja y por tanto, permite incrementar la inversión de las empresas afectadas.This dissertation studies how debt structure and risk management decisions affect firms' investment. The first chapter focuses on building the stylized facts on the relation between debt structure, capital structure and investment when firms' have both, secured and unsecured debt available. Results suggests that i) firms with higher creditworthiness tend to borrow more unsecured debt, ii) higher collateral availability may not lead to more investment and iii) more reliance on unsecured debt leads to more investment. The second chapter uses two identification strategies to test the causal effect of the relations derived in chapter one. I test the hypothesis from a balance sheet and credit channel perspective. Results show that the composition of debt structure of firms has real implications. The higher the unsecured debt in debt structure, the more firms can invest. The explanation for this result is that unsecured debt is more cost-effect in terms of spreads and debt covenants. Finally, the last chapter uses a panel of shocks to the cost of hedging to different firms at different points in time to study the relation between hedging and risk. I exploit the introduction and delisting of commodity derivatives by the CME and other exchanges for identification. I find evidence suggesting that cheaper access to hedging instruments reduces the volatility of cashflows and thus, increases firms' investment.
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Liu, Bing. "Structure insights into the autoinhibitory mechanism of the deubiquitinating enzyme USP25 and into the SUMO E1-E2 protein-protein recognition." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/665314.
Повний текст джерелаАнотація:
La ubiquitinació i la SUMOilació són dos de les modificacions post-traduccionals més estudiades (PTM). En aquesta tesi, ens hem centrat en estudiar USP25, USP28 i en el reconeixement proteïna-proteïna dels enzims SUMO E1-E2 d’aquestes dues vies PTM. USP25 i USP28 són de-ubiquitinases que tenen papers importants en processos cel·lulars i les seves activitats enzimàtiques estan regulades per diversos PTMs, incloent SUMOilació, ubiquitinació i fosforilació. La interacció proteïna-proteïna de SUMO E1-E2 és un pas essencial de discriminació en la via de la conjugació. En aquesta tesi, els principals objectius inclouen l'elucidació de les bases estructurals de la regulació de l'activitat de USP25 i USP28, així com poder desxifrar els determinants estructurals en l'especificitat proporcionada per la interacció SUMO E1-E2.
Hem resolt l'estructura cristal·lina de la USP25 humana (18 - 714). Sorprenentment, USP25 mostra una estructura quaternària homotetramèrica que està directament implicat en la inhibició de la seva activitat enzimàtica, i revela un nou mecanisme de tetramerització/inhibició. Assaigs bioquímics i cinètics in vitro amb construccions de dímer, tetràmer de USP25 donen suport a aquest mecanisme, mostrant en tots els casos una major activitat catalítica en el dímer. A més, la forta estabilització de les tankirases en cèl·lules en cultiu mitjançant l'expressió ectòpica del dímer de USP25 verifica la rellevància biològica d'aquest nou mecanisme de tetramerització/inhibició.
Pel que fa a la interacció E1 UFD - E2, hem resolt l'estructura cristal·lina del complex E1 UFD - E2 tant en humans com en A. thaliana. Tot i la baixa homologia de seqüència presentada en la superfície d’interacció de UFD entre especies, la comparació estructural entre complexos revela determinants comuns en les interfícies entre humans, llevats i A. thaliana. La comparació estructural també revela una forta conservació en la superfície d’interacció de les E2 entre espècies, tot i la forta especificitat mostrada en assajos de conjugació de SUMO en a cada organisme. Curiosament, hem trobat residus de la E2 fora de la superfície d’interacció amb UFD que tenen un impacte en la conjugació de SUMO, el que suggereix la presència d’altres determinants estructurals diferents als de la superfície d’interacció entre E2 i E1 UFD en l'especificitat de la conjugació de SUMO.Ubiquitination and SUMOylation are of the most studied post-translational modifications (PTMs). Here, we focus on USP25, USP28, and the SUMO E1-E2 protein-protein recognition in these two PTM pathways. USP25 and USP28 have important roles in cellular processes, and their enzymatic activities are regulated by diverse PTMs including SUMOylation, ubiquitination, and phosphorylation. SUMO E1-E2 protein-protein interaction is a major discrimination step in the conjugation pathway. In this thesis, the main goals include the elucidation of the structural basis for the activity regulation of USP25 and USP28, as well as to decipher the structural determinants for the specificity provided by the E1 UFD-E2 interaction. We have solved the crystal structure of human USP25 (18 – 714). Unexpectedly, USP25 displays a homotetrameric quaternary assembly that is directly involved in the inhibition of its enzymatic activity, revealing a novel tetramerization/inhibition mechanism. In vitro biochemical and kinetic assays with dimer, tetramer and truncation constructs of USP25 support this mechanism, displaying in all cases a higher catalytic activity in the dimer assembly. Moreover, the strong stabilization of tankyrases in cultured cells by the ectopic expression of the USP25 dimer verifies the biological relevance of this novel tetramerization/inhibition mechanism. Regarding to the E1 UFD-E2 interaction, we have solved the crystal structure of the E1 UFD-E2 complex in both human and A. thaliana. Despite the low sequence homology displayed by the UFD binding interface, structural comparison between complexes reveals common determinants in the interfaces between human, yeast, and A. thaliana. Structural comparison also reveals a strong conservation in the E2 binding interface across species, despite the strong specificity displayed in SUMO conjugation assays for each organism. Interestingly, E2 residues outside the UFD interface had impact on SUMO conjugation, suggesting the contribution of determinants other than the primary UFD binding interface in the specificity of the conjugation system.
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Ramzan, Muhammad. "Structural, Electronic and Mechanical Properties of Advanced Functional Materials." Doctoral thesis, Uppsala universitet, Materialteori, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-205243.
Повний текст джерелаАнотація:
The search for alternate and renewable energy resources as well as the efficient use of energy and development of such systems that can help to save the energy consumption is needed because of exponential growth in world population, limited conventional fossil fuel resources, and to meet the increasing demand of clean and environment friendly substitutes. Hydrogen being the simplest, most abundant and clean energy carrier has the potential to fulfill some of these requirements provided the development of efficient, safe and durable systems for its production, storage and usage. Chemical hydrides, complex hydrides and nanomaterials, where the hydrogen is either chemically bonded to the metal ions or physiosorbed, are the possible means to overcome the difficulties associated with the storage and usage of hydrogen at favorable conditions. We have studied the structural and electronic properties of some of the chemical hydrides, complex hydrides and functionalized nanostructures to understand the kinetics and thermodynamics of these materials. Another active field relating to energy storage is rechargeable batteries. We have studied the detailed crystal and electronic structures of Li and Mg based cathode materials and calculated the average intercalation voltage of the corresponding batteries. We found that transition metal doped MgH2 nanocluster is a material to use efficiently not only in batteries but also in fuel-cell technologies. MAX phases can be used to develop the systems to save the energy consumption. We have chosen one compound from each of all known types of MAX phases and analyzed the structural, electronic, and mechanical properties using the hybrid functional. We suggest that the proper treatment of correlation effects is important for the correct description of Cr2AlC and Cr2GeC by the good choice of Hubbard 'U' in DFT+U method. Hydrogen is fascinating to physicists due to predicted possibility of metallization and high temperature superconductivity. On the basis of our ab initio molecular dynamics studies, we propose that the recent claim of conductive hydrogen by experiments might be explained by the diffusion of hydrogen at relevant pressure and temperature. In this thesis we also present the studies of phase change memory materials, oxides and amorphization of oxide materials, spintronics and sulfide materials.
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Matloob, Haghanikar Mojgan. "Exploring students’ patterns of reasoning." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13646.
Повний текст джерелаАнотація:
Doctor of PhilosophyDepartment of Physics
Dean Zollman
As part of a collaborative study of the science preparation of elementary school teachers, we investigated the quality of students’ reasoning and explored the relationship between sophistication of reasoning and the degree to which the courses were considered inquiry oriented. To probe students’ reasoning, we developed open-ended written content questions with the distinguishing feature of applying recently learned concepts in a new context. We devised a protocol for developing written content questions that provided a common structure for probing and classifying students’ sophistication level of reasoning. In designing our protocol, we considered several distinct criteria, and classified students’ responses based on their performance for each criterion. First, we classified concepts into three types: Descriptive, Hypothetical, and Theoretical and categorized the abstraction levels of the responses in terms of the types of concepts and the inter-relationship between the concepts. Second, we devised a rubric based on Bloom’s revised taxonomy with seven traits (both knowledge types and cognitive processes) and a defined set of criteria to evaluate each trait. Along with analyzing students’ reasoning, we visited universities and observed the courses in which the students were enrolled. We used the Reformed Teaching Observation Protocol (RTOP) to rank the courses with respect to characteristics that are valued for the inquiry courses. We conducted logistic regression for a sample of 18 courses with about 900 students and reported the results for performing logistic regression to estimate the relationship between traits of reasoning and RTOP score. In addition, we analyzed conceptual structure of students’ responses, based on conceptual classification schemes, and clustered students’ responses into six categories. We derived regression model, to estimate the relationship between the sophistication of the categories of conceptual structure and RTOP scores. However, the outcome variable with six categories required a more complicated regression model, known as multinomial logistic regression, generalized from binary logistic regression. With the large amount of collected data, we found that the likelihood of the higher cognitive processes were in favor of classes with higher measures on inquiry. However, the usage of more abstract concepts with higher order conceptual structures was less prevalent in higher RTOP courses.
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Chen, Shin-Young, and 陳信勇. "Generalized DCM Approach for Cost-efficient FIR Filter Strcuture." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/80563688309092314248.
Повний текст джерелаАнотація:
碩士國立中央大學
電機工程研究所
87
Finite Impulse Response (FIR) filter is the key functional block in the area of digital signal processing (DSP). In the VLSI implementation, the hardware complexity of the FIR filter is directly proportionately to the tap length, N, and the wordlength, W. To reduce the hardware cost, we can employ the well-known scheme, Differential coef-ficient Method (DCM). The key concept of the DCM is to shorten the required the wordlength, W, without changing the SQNR of original FIR filter. This can be achieved by exploring the characteristics of the FIR filter coefficients. In this thesis, we propose a more efficient and versatile scheme based on the DCM scheme. We call it Generalized Differential coefficient Method (GDCM). Basically, the GDCM can provide more degrees of freedom in searching the optimal DCM-based design parameters. Compared with the conventional DCM, the proposed GDCM can not only reduce hardware complexity but also retain the required SQNR. It can also elimi-nate the numerical unstability that is encountered in the conventional DCM scheme. Moreover, unlike conventional DCM, which can only be used in low-pass FIR filter, we can apply the proposed GDCM to various types of FIR filters, such as low-pass FIR filter, high-pass FIR filter, band-pass FIR filter and band-stop FIR filter. A correspond-ing design methodology is developed so as to facilitate the cost-efficient VLSI imple-mentation of FIR filters in a systematic manner. Based on the derived design methodology, we also develop a CAD tool, which can generate the optimum solutions automatically for a given impulse response and the pre-defined Signal-to-Quantization-Noise Ratio (SQNR). As a result, the designer can easily apply the GDCM to save silicon complexity by using the developed CAD tool.
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Delhomme, Fabien. "Etude du comportement sous impact d'une strcuture pare-blocs en béton armé." Phd thesis, 2005. http://tel.archives-ouvertes.fr/tel-00009161.
Повний текст джерелаАнотація:
Cette thèse a pour objet l'étude du comportement d'un nouveau système de galerie de protection contre les chutes de blocs appelé Pare-blocs Structurellement Dissipant (PSD). L'innovation majeure, par rapport aux solutions classiques, est de dissiper l'énergie d'impact directement dans la dalle en béton armé ou dans des appuis fusibles, et non plus dans une couche de matériau amortissant. Les phénomènes dynamiques ayant lieu lors de l'impact d'un bloc sur la dalle sont analysés au moyen d'expérimentations sur une structure PSD à l'échelle 1/3. Les efforts de percussion appliqués à la dalle, durant la phase de contact avec le bloc, sont estimés ainsi que les différents transferts et dissipations d'énergie. Les résultats ont permis de valider le principe de fonctionnement et de réparation des PSD et font apparaître que la dalle est endommagée par trois mécanismes majeurs : le poinçonnement, la mise en flexion et la déstructuration de surface de la zone impactée. Les principales grandeurs expérimentales sont retrouvées à l'aide de simulations numériques des essais avec un code éléments finis. Un modèle mécanique simplifié « masses-ressorts-amortisseur » est également développé dans le but de concevoir des méthodes de dimensionnement applicables en bureau d'études. Les perspectives de ce travail sont d'aboutir à l'établissement de recommandations sur la conception et la réalisation des pare-blocs structurellement dissipants.
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Lai, Cheng-Tsung, and 賴政宗. "Strcutural Analysis of the Cytidine Deaminase Superfamily: Conservation, Divergence and Prediction." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/57924626540809995089.
Повний текст джерелаАнотація:
碩士國立陽明大學
遺傳學研究所
92
One major challenge in the post-genomic era is to understand how nature has evolved one structural fold into various proteins for their different functions. Structural analysis of homologous proteins in a structural superfamily would provide an efficient path to understand the structural plasticity for the functional versatility. Our analysis has revealed that cytidine deaminases (CDAs), fungal cytosine deaminases (CDs), plant and some bacterial guanine deaminases (GDs), dCMP deaminases (dCMPD), RNA editing deaminases and riboflavin biosynthesis protein RibG belong to the CDA superfamily. These deaminases catalyze the zinc-assisted conversion of the amino group of the cytosine, guanine or adenine moiety into a keto group. To identify the putative substrate-recognition residues for each member, a comparative analysis of the available structures in the superfamily was first carried out. Then multiple sequence alignments for each member and for the CDA superfamily were performed by the program ClustalW, followed by manual editing according to the structural information and secondary structure prediction using PSI-PRED. Finally, atomic models were built based on the known structures to reveal whether the conserved residues are potentially localized nearby the active-site cavity. The putative substrate-interacting residues for dCMPD, RibG and RNA-editing deaminase have been identified. Obviously, these deaminases utilize different residues to interact with the common ribose and phosphate groups of their substrates. Our results also reveal that a large portion of the conserved residues are responsible for the superfamily's structural plasticity, whereas only a small portions are directly involved in its functional versatility. These prediction results would provide a structural basis for mutational analysis to elucidate the functional roles of the critical residues.
Книги з теми "Strcutures"
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Sarre, Philip. Recomposition of the class strcuture. Sage, 1989.
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Sitepu, H., J. P. Wright, T. Hansen, Daniel Chateigner, Heinz Günter Brokmeier, Clemens Ritter, and Takaomi Ohba. "Combined Synchrotron and Neutron Strcutural Refinement of R-Phase in Ti50.75.Ni47.75.Fe1.50 Shape Memory Alloy." In Materials Science Forum, 255–60. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-975-x.255.
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"Chapter Eight. Strcuture and Function of Pelagic Food Webs." In A Mechanistic Approach to Plankton Ecology, 151–82. Princeton University Press, 2009. http://dx.doi.org/10.1515/9780691190310-011.
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Zhang, Chengpeng, Zhihua Yu, Jimin Shi, Sheng Qiang, Yu Li, Wenqiang Xu, and Zheyi Guo. "Application of Hexahedral Mesh Generation AlgorithmBased on Frame Field and Feature in Hydraulic Strcutures." In 2022 8th International Conference on Hydraulic and Civil Engineering: Deep Space Intelligent Development and Utilization Forum (ICHCE). IEEE, 2022. http://dx.doi.org/10.1109/ichce57331.2022.10042611.
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Anderson, Christianne, and Kumar Tamma. "Bridging of Spatial and Temporal Characterization in Superlattices and Periodic Thin-Film Strcutures Via the C- and F-Processes Heat Conduction Model." In 45th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-621.
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Rizvi, Syed Muhammad Mujtaba, Yousof Nayfeh, Baha El Far, and Donghyun Shin. "Use of Silica Coated Zinc Nanoparticles for Enhancement in Thermal Properties of Carbonate Eutectic Salt for Concentrated Solar Power Plants." In ASME 2020 14th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/es2020-1710.
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Abstract Concentrated Solar Power (CSP) is one of the most efficient mega-scale renewable Energy sources. However, the overall cost of energy production is not viable for commercial usage and supplanting with fossil fuels or energy produced by nuclear ways. Its operational cost mainly lies in the electrical and thermal systems of the plant. The thermal system comprises of heat storage and heat transfer system. Any enhancement to heat storage or transfer system will directly reduce the cost of operation and increase the yield. Conventionally, oils stable up to 400C were used to transfer and store heat, however more recently, molten salts have been operational in the field for purpose of heat transfer but still, their thermal storage and conduction are limited. The current work explores the possibility of boosting the thermal storage capacity of molten salts through the latent heat of added phase change materials and increasing the specific heat at the same time by adding silica encapsulated zinc nanoparticles. We studied the advantage of adding coated Zn nano-sized particles to carbonate eutectic mixture for enhanced thermal energy storage and heat capacity enhancement. Zinc particles (40nm–60nm) obtained from the commercial sources were coated with silica shells using the solgel process under alkaline conditions. The nano-capsules were then dispersed in a mixture of carbonate salts. A differential scanning calorimeter was employed to characterize the thermal properties of the mixture. Tranmission electron miocroscopy was employed to characterize nanoparticles and electron diffraction Spectroscopy was performed to characterize materials and strcutures involved.
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Younas, Afshan, and Aza Azlina Md Kassim. "The Mediating Role of CSR Disclosure between Board Structure and Capital Strcuture." In ICEEG 2023: 2023 7th International Conference on E-Commerce, E-Business and E-Government. New York, NY, USA: ACM, 2023. http://dx.doi.org/10.1145/3599609.3599633.
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Im, Hong-Sik, and Ge-Cheng Zha. "Simulation of Non-Synchronous Blade Vibration of an Axial Compressor Using a Fully Coupled Fluid/Structure Interaction." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68150.
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In this paper non-synchronous vibration (NSV) of a GE axial compressor is simulated using a fully coupled fluid/strcuture interaction (FSI). Time accurate Navier-Stokes equations are solved with a system of 5 decoupled structure modal equations in a fully coupled manner. A 3rd order WENO scheme for the inviscid flux and a 2nd order central differencing for the viscous terms are used to resolve nonlinear interaction between vibrating blades and fluid flow. 1/7th annulus is used with a time shifted phase-lag (TSPL) boundary condition to reduce computational efforts. A fully conservative rotor/stator sliding boundary condition is employed to accurately capture unsteady wake propagation between the rotor and stator blades. The predicted dominant frequencies using the blade tip response signals are not harmonic to the engine order, which is the NSV. The blade vibration is torsionally coupled with highly oscillating blade pressure and is not damped out during the NSV. No resonance to the blade natural frequencies is found. The instability of tornado vortices in the vicinity of the rotor tip due to the strong interaction of incoming flow, tip vortex and tip leakage flow is the main cause of the NSV observed in this study.