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1
Grządziela, Andrzej, Bogdan Szturomski, and Marcin Kluczyk. "Modeling of the Minehunters Hull Strenght." Advanced Materials Research 1036 (October 2014): 189–94. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.189.
Повний текст джерелаАнотація:
The paper presents problems of modeling the ship’s hull subjected to the load of shock wave associated with non-contact underwater explosion. The article presents equations for describing the parameters of shock wave subjected to an impulse load. The paper presents a proposal of identification of a degree of hazard the ship’s hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of hull. Modeled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact and model of propulsion system. All sub models allow testing forces and their responses in vibration spectrum using SIMULINK software and FEM models. The results of testing allowed performing simulations of a similar nature to the actual loads of underwater explosions. Virtual model of the hull of the ship responds in a similar manner to the real impacts.
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Almasi, Adrian, Anca Porumb, Angela Codruta Podariu, Liana Todor, Sergiu Alexandru Tofan, and Ramona Amina Popovici. "The Effects of Nanofillers on Composite Materials Mechanical Properties." Revista de Chimie 68, no. 1 (February 15, 2017): 192–99. http://dx.doi.org/10.37358/rc.17.1.5417.
Повний текст джерелаАнотація:
The goal study is benchmarking flexural strength FS of compressive strength CS, compression diametrical DTS (diametrically tensile strenght) and Vickers hardness for two nanocomposites experimental AD1 and AD3 achieved within the Research Institute in Chemistry Raluca Ripan Cluj Napoca and for the commercial product of the Kerr Premise company �. Electron microscopy aspects pre- and post-fracturing are also shown to highlight the structure of materials and spread
3
Da Silva, Josivaldo Godoy, Desirée Ferro Scapinelli, Josivaldo Godoy Da Silva, Lailson Moura Fé, and Iandara Schettert Silva. "Biomedical Mechatronic Dynamometer to Support the Evaluation of the Effects of Leprosy Through the Palmar Holding Strenght and the Tweezer Holding Strenght." International Journal for Innovation Education and Research 8, no. 1 (January 31, 2020): 109–18. http://dx.doi.org/10.31686/ijier.vol8.iss1.2125.
Повний текст джерелаАнотація:
The hand can suffer the effects of several diseases among the most serious, leprosy stands out, which is considered infectious and can generate loss of muscle strength, atrophy, deformity and physical, mental and social disability. For the World Health Organization (WHO) and also doctors and physiotherapists, it is necessary to evaluate the diseases in an objective, reliable and early manner in order to propose appropriate treatment and follow their evolution. This research proposed a biomedical mechatronic dynamometer in order to support the evaluation of the effects of leprosy by means of palmar grip strength and grip strength of tweezers performed by hand. The experimental research was developed at the Federal University of Mato Grosso do Sul and consisted first of all in the survey of the demands of the health area in relation to the biomedical dynamometer being consulted the following databases: Medical Literature Analysis and Retrieval System Online (Medline); US National Library of Medicine National Institutes of Health (PUBMED) e Institute of Electrical and Electronic Engineers (IEEE). The mechatronic biomedical dynamometer consisted of three fundamental parts: mechanical structure, electronic signal conditioning circuitry and digital information processing. The mechanical structure was designed to withstand a strenght of up to 700 N, developed in brass because this metal has low cost, has less mass and also because it is easier to machine than steel. The oval shape of the structure contains two lateral and thin regions that measure 2 cm thick, 3 cm wide each and aim to concentrate mechanical stresses in order to sensitize the strain sensor consisting of the four linear strain gages, model N2A-XX-S5262P-350/E4 and nominal resistance of 350 Ω, from the company Micro-Measurements, which showed accuracy of 98%. The mechanical structure also has a stainless-steel support that measures 1 cm thick and 3 cm wide located at the bottom and on which was glued a cushion to support the palm of the hand. This support can be replaced by other models that also contain a cushion that considers the presence of injuries or deformities in the hand. The mechanical structure also has a upper support that also measures 1 cm thick and 3 cm wide, to which four pressure sensors developed with rosette strain gages model N2K-XX-S5294R-350/DP/E4 with a nominal resistance of 350 Ω, from the company Micro-Measurements, were fixed and which showed an accuracy of 99.5%. The deformation sensor is stimulated by the application of palmar grip strenght while the pressure sensors are stimulated by the realization of index, middle, annular and minimum finger gripping strenght. In addition, these sensors are connected to Wheatstone Bridges whose feeds and also the responses are processed by five signal conditioning circuits developed with operational amplifiers LF 356, OPA 27 and OP27 GP of the company Burr-Brown, whose structure consists of voltage oscillator, amplifier, band pass filter, buffer and peak detector that generates DC voltage that feeds the data acquisition board. The answers on this board are sent to the Inspiron 15 3000 microcomputer from Dell, which has installed Labview software from National Instruments, which processes the information, stores, plotts the palmar grip strenght and pinch grip strenght graphs and can also send the information over the Internet. This research has the potential to obtain accurate information on the effects of leprosy in the hand that can support the evaluation, diagnosis of health professionals, follow up the evolution of the disease and the treatment adopted.
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Zygoń, P., and Z. Nitkiewicz. "Specific Bending and Compressive Strenght of Poly(Vinyl Alcohol)-CNT Composites." Archives of Metallurgy and Materials 61, no. 2 (June 1, 2016): 993–96. http://dx.doi.org/10.1515/amm-2016-0169.
Повний текст джерелаАнотація:
Abstract Carbon nanotubes are one of the strongest materials of unique mechanical, optical, electrical and electronic properties. Because of that they are mainly used as semiconductor materials constituting the reinforcing phase in composite materials. The paper presents properties of polymer composites reinforced with carbon nanotubes (CNT) containing various mixtures of dispersion. Produced composites featured various content carbon nanotubes: 20%, 30%, 40% i 50%. Macroscopic observations were carried out on ready to check composites, if pores exist in the structure and whether the reinforcement has been distributed in the entire volume. Bending and compressive strengths tests were performed and densities of individual composites were measured to determine the specific strength. Composite materials strengthened with carbon nanotubes feature a very low density and a very good mechanical strength, which makes them a good structural material.
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Fauzi, Hendro Ahmad. "EVALUASI KINERJA DAN PERBAIKAN STRUKTUR BETON GEDUNG PENDINGIN AIR = EVALUATION ON THE PERFORMANCE OF AND REPAIR OF THE CONCRETE STRUCTURE OF A COOLING WATER TOWER." Material Komponen dan Konstruksi 13, no. 1 (January 9, 2019): 9. http://dx.doi.org/10.29122/mkk.v13i1.1655.
Повний текст джерелаАнотація:
This paper presents the evaluation of performance and strenght ofstructure by visual inspection and quality testing of concrete in the field by using aSchmidt hammer and UPV. The evaluation on the performance of the structure,strength columns, beams and plates refer to SNI-2847-2002, in which theimplementation of earthquake loads was based on SNI-1726-2002.The paperproposes improvements and retrofitting necessary structures. SAP2000 is usedfor structural analysis necessary to obtain the required strength values (Ru).Beton2000 is used for structural analysis of existing conditions in order to get thedesigned strength values (Rn). The structure components are in safe condition ifits design strength is greater or equal than required strength or (Ø.Rn) ≥ Ru.Improvements were made to the structural element by coating and injectionmethods.Keywords : structural performance evaluation, improvement AbstrakMakalah ini menyajikan evaluasi kinerja dan kekuatan struktur denganmetode pemeriksaan secara visual dan pengujian mutu beton di lapangandengan alat Schmidt hammer dan UPV. Evaluasi kinerja struktur, kekuatankolom, balok serta pelat mengacu pada SNI-2847-2002, dengan penerapanbeban gempa berdasarkan SNI-1726-2002, serta memberikan usulan perbaikandan perkuatan struktur yang diperlukan. SAP 2000 digunakan untuk analisisstruktur guna mendapatkan nilai kuat perlu (Ru). Beton 2000 digunakan untukanalisis struktur kondisi existing guna mendapatkan kuat rencana (Rn).Komponen struktur dikatakan aman jika kuat rencana lebih besar atau samadengan kuat rencana atau (ф . Rn) ≥ Ru. Perbaikan elemen struktur dilakukandengan metode coating dan injeksi..Kata kunci : evaluasi kinerja struktur, metode perbaikan
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Rabinovich, M. Kh, and M. V. Markushev. "Influence of Microcrystalline Structure and Superplastic Deformation on the Constructional Strenght of Aluminium Alloys." Materials Science Forum 170-172 (October 1994): 219–24. http://dx.doi.org/10.4028/www.scientific.net/msf.170-172.219.
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Liu, Shu Ying, Guang Bao Liu, Zhong Hao Heng, and Kuan Xu. "Research on Interface Structure and Fracture Mechanism of Diffusion Bonding of Titanium Alloy/Cu/Stainless Steel." Applied Mechanics and Materials 117-119 (October 2011): 380–84. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.380.
Повний текст джерелаАнотація:
Using analysis methods of stretching test，SEM，EDS and microhardness test to investigate and research the mechanical properties, the fracture mechanism，the reacting phases are produced and the distribution range of vacuum diffusion bonding joints of Ti-6Al-4V/Cu/304. The results show that when bonding pressure is 5.0 MPa, the tensile strenght of the joint increases at first, but decreases with the increasing of bonding temperature and time, When bonding temperature is 1223K, bonding time is 3.6ks, there is a maximum tensile strength that is 163 Mpa. However, it will be disadvantageous to the performance of the joints, when bonding temperature and time extended overly. Using Copper foil as the interlayer, the intermetallic compounds did not generate in interface of Cu/304，Therefore, it formed multi-phase transition organizations by solid solution, intermetallic compounds in interface of Titanium alloy/Cu，such as TixCuy, TixFey and so on. The effect of TixCuy on strength of the joints is slightly larger than TixFey compound. The fracture mainly happened in the titanium alloy side Ti2Cu intermetallic compound in region Ⅱfor the source dehiscence, developping inⅡ-Ⅲ area junction weak intermetallic compounds of diffusion layer. It is brittle fracture. Therefore, it is the main way to improve the joint strength by improving the interface structure of titanium alloy/Cu side.
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Fauzi, A. Rizki, and Markawie Markawie. "DESIGN OF COMPOSITE GIRDER STRUCTURE BRIDGE OF SELUANG-1 RIVER PT LIFERE AGRO KAPUAS, KAPUAS DISTRICT." CERUCUK 4, no. 1 (June 7, 2021): 1. http://dx.doi.org/10.20527/crc.v4i1.3576.
Повний текст джерелаАнотація:
The bridge at the Seluang-1 river is located around the palm oil plantation land owned by PT Lifere Agro Kapuas, Kapuas Regency, Central Kalimantan. In this Seluang-1 river, a bridge is planned to be built to facilitate the mobilization of palm oil plantation crops and other matters as well as transportation in the PT Lifere Agro Kapuas area because before there was a bridge the transportation traffic was cut off by the river so it had to circle quite a long way. The bridge is designed as a bridge with composite girder structure type. The methodology in the design of loading uses the SNI 1725-2016 concerning on the Loading Standards for Bridges and SNI 2833-2016 concerning on the Earthquake Resilience Planning Standards for Bridges. For methodology in designing concrete structures refer to SNI 2847-2013 concerning Structural Concrete Requirements for Buildings and methodology in designing steel structures refers to SNI 1729-2015 concerning Specifications for Structural Steel Buildings. The material used for abutment uses reinforced concrete material. The methodology in calculating the bearing capacity of the foundation uses the method by Mayerhof and also the method by Kazuto Nakazawa, while the methodology in calculating the lateral bearing capacity uses the Broms method, with the efficiency of the pile using a graph by O’Neill. From the results of topographic measurements taken a bridge design with a span of 30 m with a total bridge width of 7 m. The slab design is 25 cm thick with the compressive strenght of concrete is fc’ 30 MPa (K-350). The steel girder beam used WF Profile 1350.800.100.130 and the diaphragm beam used WF Profile 250.125.6.9 with BJ55 steel quality (fy 410 MPa). Whereas in the lower structure, the abutment designed with a height of 350 cm, a width of 320 cm and a length of 850 cm, was used with compressive strenght of concrete is fc’ 30 MPa (K-350). In the foundation used Spun Pile type piles with a diameter of 60 cm with a depth of 30 m piling as much as 8 piles on one abutment. Obtained Qallow = 116,37 tons > Qload = 114,69 tons so that the foundation is declared safe. The planned budget for the construction of a bridge on the Seluang-1 river is Rp 8.990.566.000,00.-
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Perijoc, Dumitru-Silviu, and Leonard Domnisoru. "Evaluation of the vertical strenght of a 3000 tdw barge using the equivalent beam approach." Analele Universităţii "Dunărea de Jos" din Galaţi Fascicula XI Construcţii navale/ Annals of "Dunărea de Jos" of Galati Fascicle XI Shipbuilding 44 (December 3, 2021): 101–4. http://dx.doi.org/10.35219/annugalshipbuilding/2021.44.15.
Повний текст джерелаАнотація:
For the preliminary design stage, the evaluation of vertical strength is mandatory for the preliminary scantling of the structure. This paper presents the evaluation of the vertical sectional efforts by equivalent beam approach, using the 3D-CAD lines plan of a 3000 tdw barge and mass diagram. For numerical analysis the own program P_QSW is used, for sagging and hogging wave condition, ship headings 0 and 45o, wave height max. 1.2 m. The vertical sectional efforts are compared with the maximum bending moment and shearing force prescribed by the classification societies for the 3000 tdw preliminary vertical strength assessment.
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Javed, Raja Ahsan, Shi Fan Zhu, and Feng Chun Jiang. "Importance of Material’s Dynamic Stress Intensity Factor Calculation in the Design of High Strenght Structures." International Journal of Engineering Research in Africa 15 (April 2015): 97–106. http://dx.doi.org/10.4028/www.scientific.net/jera.15.97.
Повний текст джерелаАнотація:
The researchers and scientists have concluded that material dynamic fracture properties must be considered during the design stage of the modern structure. The dynamic stress intensity factor is very important in understanding of material dynamic behavior. Keeping in view the importance of the materials dynamic stress intensity factor: an efficient and reliable numerical-analytical procedure is developed for calculation of dynamic stress intensity factor. For this, three-dimensional model of a Modified Hopkinson Pressure Bar (MHPB) and a specimen is modeled and analyzed with the ANSYS software. Transient dynamic analysis technique is used for simulation of load-variations as a function of time. As an output of analysis, values of load point displacement and Crack Mouth Opening Displacement (CMOD) are obtained. These values are substituted into two different analytical formulas for calculation of a dynamic stress intensity factor. The results obtained are compared with previous published results, and a good agreement is found.
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Gherman, Timea, Marioara Moldovan, Miuţa Filip, Trifoi Ancuța, Maria Râpă, and Stanca Cuc. "Effect of PEG Content on the Mechanical Properties of Bis-GMA/TEGDMA/UDMA Dental Resin Composites." Key Engineering Materials 752 (August 2017): 3–10. http://dx.doi.org/10.4028/www.scientific.net/kem.752.3.
Повний текст джерелаАнотація:
In this study urethane dimethacrylate (UDMA) based dental resin materials were synthesized. Urethane methacrylate oligomers (UDMO) were synthesized via a radical chain growth polymerization mechanism using polyethylene glycol (PEG) in order to improve the mechanical properties, without adding a solvent in the reaction medium. The structure of the new monomer and oligomer were confirmed by FT-IR and 1H-NMR spectra. The results of FT-IR analysis indicated that the addition of PEG as plasticizer in the urethane methacrylate dental material in the adequate molar ratio (isophorone diisocyanate : HEM (2-hydroxyethyl methacrylate) : PEG = 2:2:1) improve the isocyanate double bond consumption. The Elastic strength (MPa) and Young’s Modulus of bending (MPa) were measured using a three-point bending set up. Urethane dimethacrylate monomer without PEG was used as control group. The results showed that PEG containing UDMO resins had lower Young’s Modulus: 2984 MPa and 2537 MPa (for 40s irradiation time) and Elastic strenght: 77 MPa and 51 MPa than UDMA derived resin: 3270 MPa respectively 90 MPa for all irradiation times (20 and 40 seconds).
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Munthe, Agyanata Tua, and Muklish Nalahuddin. "COUPLING BEAM DESIGN WITH SPECIAL MOMENT FRAME AND SPECIAL REINFORCED CONCRETE SHEAR WALLS." Neutron 18, no. 2 (January 31, 2019): 28–41. http://dx.doi.org/10.29138/neutron.v18i2.75.
Повний текст джерелаАнотація:
An Earthquake is on of the natural phenomena that cannot be avoided or cannot be prevented by its appearance which is very difficult to accurately predict both from the time and place of its occurrence. Shear wall system is used to increase the sitffness of many multi-storey building, in this case building that have more than 20 floors. Building structures with shear wall as retaining element of lateral force generally have good performance during an earthquake. Coupling beam is an connecting beam betweem two shear walls, this beam makes a series of shear walls works as a system that is able to withstand earthquake force. Coupling beam also make the working structure rigid and absorbs energy due to the very high rigidity of the coupling beam with shear wall behaving link two free cantilevers. Coupling beam is considered to be able to transmit shear force from one wall to another so that it can withstand large structural deformation. Structure design material strenght for concrete fc’ 35MPa ~ fc 55’MPA and rebar (D10 & D13) using fy 520MPa and fy 420MPa for diameter >16mm. While the regulations used are SNI 1726: 2012, SNI 1727: 2013, and SNI 2847: 2013. Structural loading is given according to loading rules which are then analyzed using ETABS 2016 software.
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Melo-Silva, Cláudio Luis, Cristiane Fonseca Carvalho, Claudinei Santos, and Jefferson Fabrício Cardoso Lins. "Evaluation of the Influence of the Silane Drying Temperature on the Feldspar and Zirconia-Based Ceramics Surfaces." Materials Science Forum 727-728 (August 2012): 826–30. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.826.
Повний текст джерелаАнотація:
Ceramics are widespread used in restorative dentistry, mainly due to their aesthetics features. However, adequante bond strenght of this type on restoration to tooth structure spawned several investigations which aim to develop a clinical protocol for ceramic surface treatment. The objective of this study was to evaluate the influence of air temperature on the drying process of silane agent and the adhesion of feldspar and yttrium stabilized zirconia. They were divided into three groups (n=10): control; room temperature dried silane; and silane drying at 70º C. Then, composite resin cylinders were bonded to the samples and taken to a shear test. The results showed that air temperature rise, in silane drying, improved bonding resistance in Y-TZP ceramics, nevertheless in feldspatic ceramics, the bonding resistance was not altered.
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Franciska, Ayu, and Rosyid Nur Anggara Putra. "Determinan Nilai Perusahaan Pada Jakarta Islamic Index 2015-2019." JURNAL AKUNTANSI DAN KEUANGAN ISLAM 9, no. 2 (October 22, 2021): 157–79. http://dx.doi.org/10.35836/jakis.v9i2.260.
Повний текст джерелаАнотація:
The purpose of this study is to examine the factors that influence firm value in manufacturing companies listed on the Jakarta Islamic Index (JII) for the 2015-2019 period. This study examines the effect of financial leverage, size, asset structure and corporate governance on firm value as measured by price to book value. The sample was determined by purposive sampling method and obtained 50 observation data. Research data collected form documentaion form the company’s annual report. The analysis technique used is multiple regression analysis. The results show that financial leverage, size, asset structure and corporate governance have a positive and significant effect on firm value. Financial leverage ratio encourage the company to pay off the liability, so cab be said that the manufacturs company do the best perfomance to create firm value. Size have positive impact to firm value. The big size company can denote the growth of the company and make the positif signal for investor. The Assets Structure has positive impact on firm value indicating that the assets structure is used optimally, it will increase the company’s return. Corporate Goverance has a positve effect on firm value where CEO Duality as indicator of corporate governance provide the strenght for top management and Independen Commisioner indicates the ability of the bord commissonerstoo make decisons more objectively.
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Lempang, Mody. "Basic properties and uses of agathis (Agathis hamii M. Dr.) wood from South Sulawesi." Jurnal Penelitian Kehutanan Wallacea 6, no. 2 (August 31, 2017): 157. http://dx.doi.org/10.18330/jwallacea.2017.vol6iss2pp157-167.
Повний текст джерелаАнотація:
Wood proper uses of tree species can be determined by it’s basic properties. This research was carried out to examine the basic properties (anatomical structure, chemical, physical and mechanical) of agathis (Agathis hamii M. Dr.) wood from natural forest in Sulawesi. Proper uses of wood was determined by considering their basic properties and uses which the local community have currently employed. Results revealed that agathis heartwood is whitenish to yellow brownish colour; fine texture; straigh grain; glossy; rather soft; moderate in specific gravity; moderate in dimensional shrinkage; strenght class III; high in cellulose and pentose content; low in lignin, extractive and ash content; remarkably long fiber and thin wall thickness; fiber grade is very good for pulp/paper manufacture. Appropirate uses of agathis are for light construction material in house building and certain ship components, furniture, handicraft and wood industry.
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Jasionowski, Robert, Dariusz Zasada, and Wojciech Polkowski. "The Effect of Aluminum Content on the Microstructure and Cavitation Wear of Feal Intermetallic Alloys." Acta Mechanica et Automatica 8, no. 1 (March 1, 2014): 49–52. http://dx.doi.org/10.2478/ama-2014-0009.
Повний текст джерелаАнотація:
Abstract Intermetallic-based alloys (so called intermetallics) of the Fe-Al binary system are modern construction materials, which in recent decades have found application in many branches of the power, chemical and automotive industries. High resistance of FeAl based alloys to cavitational erosion results first of all from their high hardness in the as-cast state, large compressive stresses in the material, as well as homogeneous structure. In the present paper, the effect of aluminum content on the microstructure, texture and strain implemented upon cavitation wear of FeAl intermetallic alloys, have been analyzed by field emission gun scanning electron microscopy (FEG SEM) and electron backscatter diffraction (EBSD) analysis. Obtained results of structural characterization indicates that with increasing aluminium content effects of orientation randomization (weakening of <100>//ND casting texture), grain refinement and rising of mechanical strenght (and so cavitational resistance) take place.
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Vuorinen, Esa, Jesper Vang, Malo Carradot, Pernilla Johansson, and Erik Navara. "Powder Metallurgically Produced Carbide Free Bainite." Materials Science Forum 782 (April 2014): 480–86. http://dx.doi.org/10.4028/www.scientific.net/msf.782.480.
Повний текст джерелаАнотація:
Steels with carbide free bainitic (CFB) microstructures show excellent strength, toughness and wear resistance. Cast or wrought products produced by conventional metallurgy have become gradually introduced in manufacturing of numerous machine components. The required silicon addition of more than 1.5wt% in CFB-steels limits the possibilities to produce components of these steels by P/M methods. The aim of this work has been to investigate the possibilites to produce CFB-steels by pressing and sintering. Four different powder mixtures based on Distaloy DC powder have been pressed to a relative density of 90 % and sintered in a N2-H2 atmosphere at 1150 °C. The sintered components were then austenitized followed by austempering at a temperature above the martensite start temperature. Tensile and impact testing together with microhardness measurements have been performed. The microstructures were studied by optical microscopy as well as SEM and XRD-methods. The tensile strength values achieved varied from 313 to 737 MPa, the elongation after fracture were between 0.1 and 0.2%. The impact toughness values varied between 4 and 11 J. The hardness of the bainite after short sintering time varied between 630 and 710 HV and the hardness of the CFB was 350 HV after short sintering time but reached 573 after prolonged sintering. The microstructure consisted mainly of bainite, small amount of CFB mixed with austenite but also of ferrite and retained austenite after short sintering time. A longer sintering time created a structure consiting of mainly CFB with bainite and a small amount of ferrite. The most interesting applications for P/M produced CFB-containing steels should be components subjected to sliding or rolling-sliding wear loads, as gears. The hardness and strenght values achieved in the present work indicate that P/M produced CFB-steels can prove superior to conventional P/M steels in many applications.
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Vitale, Francesco. "The The Teleological Program. Ernst Mayr’s Teleonomy from Philosophy to Cybernetics (or Kant’s Revenge)." Aisthesis. Pratiche, linguaggi e saperi dell’estetico 14, no. 2 (January 24, 2022): 17–28. http://dx.doi.org/10.36253/aisthesis-12754.
Повний текст джерелаАнотація:
Teleology is still a source of embarrassment for the natural sciences and in particular for biology that seems unable to describe and explain the genesis and structure of life without it. How is it possible for something not yet existing to determine the occurrence of what is temporally prior to it? How can the future cause the present and the past? In what follows we intend to examine the elaboration of the biological notion of «teleonomy» through the writings of Ernst Mayr, in order to verify its rigor and strenght with respect to the criteria of scientificity adopted by Mayr himself, in particular with respect to the adoption of the cybernetic model. On the one hand, to show the consistency of the debt that the so-called scientific discourse owes to the philosophical tradition, where it elaborates notions that claim to be emancipated. On the other hand, to detect, within the scientific discourse itself, the limits that a certain position that claims to be scientifically founded can impose on research, becoming a dogmatic assumption.
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Bintoro, Atik. "LENDUTAN STRUKTUR TWIN BOOM PESAWAT TERBANG NIR AWAK LSU-05 PADA SAAT MENERIMA BEBAN TERBANG (DEFLECTION OF LSU-05 UAV TWIN BOOM STRUCTURE ON RECIEVING THE FLIGHT LOAD)." Jurnal Teknologi Dirgantara 14, no. 2 (July 21, 2017): 91. http://dx.doi.org/10.30536/j.jtd.2016.v14.a2386.
Повний текст джерелаАнотація:
The twin-boom structure is a component of LSU-5 unmanned aireal vehicle (UAV) construction wich was produced by Aeronautic Technology Center of LAPAN. This structure serves as a stabilizer UAV movements. In operations, the structure will recieve flight load which could result as the structure deflection. Through analytical methods involving the mission, dimensions and configuration of the structure of the twin-boom LSU 05 UAV, has done research to determine the extent of the ability of the structure in the fligth load, so the resulting deflection. From this research it was known that at flighting during 130 minutes, starting from take off the beginning of the flight until cruising with maximum velocity in 130 km/h, the maximum deflection that occurred in the structure only reaches 5.593 x 10-6 m, with a safety factor of 1.3, it’s means that the structure was relatively save. While at the landing on a relatively save was velocity below 14 km/h. If landing at the velocity exceeding 20 km/h can be believed that the twin-boom structure suffered severe damage, because the stress occurs already exceeded from 650 MPa as the yield strenght of e-glass composite materials. Abstrak:Struktur twin boom merupakan salah satu komponen konstruksi pesawat terbang nir awak LSU-05 hasil karya Pusat Teknologi Penerbangan - LAPAN. Struktur ini berfungsi sebagai penyetabil gerakan pesawat. Dalam operasionalnya, struktur menerima beban terbang yang dapat mengakibatkan timbulnya lendutan. Melalui metode analitis yang melibatkan misi, dimensi dan konfigurasi struktur twin boom pesawat LSU-05, telah dilakukan penelitian untuk mengetahui sejauh mana kemampuan struktur dalam menerima beban terbang, sehingga mengakibatkan lendutan tersebut. Dari penelitian ini diketahui bahwa pada saat penerbangan, selama 130 menit mulai dari tinggal landas di awal penerbangan sampai dengan terbang jelajah pada kecepatan maksimal 130 km/jam, lendutan maksimal yang terjadi pada struktur hanya mencapai 5,593 x 10-6 m, dengan faktor keamanan sebesar 1,3 berarti struktur relatif aman. Sedangkan untuk pendaratan, kecepatan yang relatif aman dapat dilakukan di bawah 14 km/jam. Jika mendarat pada kecepatan melebihi 20 km/jam, struktur twin boom tersebut mengalami kerusakan parah, karena tegangan yang terjadi sudah melebihi 650 MPa sebagai tegangan ijin bahan struktur yakni komposit e-glass.
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OUNPANICH, Duangporn, Yukio MIYASHITA, Yoshiharu MUTOH, and Kenji YOSHII. "113 Fatigue Strength of Fabricated Structure Steel." Proceedings of the Materials and processing conference 2006.14 (2006): 37–38. http://dx.doi.org/10.1299/jsmemp.2006.14.37.
Повний текст джерела
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Kitamura, Takayuki, Yoshitaka Umeno, and Akihiro Kushima. "Ideal Strength of Nano-Components." Materials Science Forum 482 (April 2005): 25–32. http://dx.doi.org/10.4028/www.scientific.net/msf.482.25.
Повний текст джерелаАнотація:
The ideal (theoretical) strength was originally defined as the stress or strain at which perfect crystal lattice became mechanically unstable with respect to arbitrary homogeneous infinitesimal deformation. This has been intensely investigated because the ultimate strength without defects is a fundamental mechanical characteristic of materials. In the analyses, the instability criteria have been studied on the basis of elastic constants. Recent developments in computational technology make it possible to analyze the ideal strength on the basis of quantum mechanics. On the other hand, it is well known that the mechanical strength of components is dependent not only on (1) material (atom species), but also on (2) loading condition and (3) structure. Because most studies on the strength in terms of atomic mechanics have focused on the factor (1) (materials), analysis has mainly been conducted on simple crystal consisting of perfect lattices (e.g. fcc and bcc) under simple loading conditions (e.g. tension), though some have explored the properties of bulk materials with defects (e.g. vacancy and grain boundary). Small atomic components (nano-structured components) such as nano-films, nano-wires (tubes) and nano-dots (clusters) possess their own beautiful, defect-free structures, namely ideal structure. Thus, they show characteristic high strength. Moreover, utilizing the structure at the nanometer or micron level is a key technology in the development of electronic devices and elements of micro (nano) electro-mechanical systems (MEMS/NEMS). Therefore, it is important to understand the mechanical properties not only for the sake of scientific interest, but also for engineering usefulness such as design of fabrication/assembly processes and reliability in service. In the other words, the effects of structure (factor (3); e.g. film/wire/dot) have to be understood as the basic properties of atomic components. Thus, the definition of ideal strength should be expanded to include the strength at instability of components with ideal structures under various external loads (factor (2)), which provides fundamental knowledge of nano-structured materials. In this paper, we review works on the strength of ideal nano-structured components in terms of factor (3), mainly under tension.
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Hamada, Shigeru, and Kenji Hasizume. "OS5-2-4 Strength Reliability of Micro Polycrystalline Silicon Structure." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007.6 (2007): _OS5–2–4–1—_OS2–5–4–5. http://dx.doi.org/10.1299/jsmeatem.2007.6._os5-2-4-1.
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Rapalska, J., Henryk Dyja, and Bartosz Koczurkiewicz. "The Physical and Numerical Modeling of Heat Treatment the Experimental Complex-Phase (CP) Steel." Materials Science Forum 706-709 (January 2012): 1497–502. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1497.
Повний текст джерелаАнотація:
The fast development of automotive industry effects significantly on aspirations of designers and constructors to reduces the mass-produced cars, affecting meaningly on fuel consumption and gas emition. From the standpoint of automotive industry materials for modern car-body sheets should have high mechanical properties (primarily high tensil strenght) and very good cupping. The required high mechanical and plastic properties steels used in produce of car bodies are dependent on the type of the obtaining structure, witch be shaped by an appropriate heat and thermo-plastic treatment. The modern steels used in automotive industry are multi-phase steels e.g. dual-phase (DP), complex-phase (CP) and transformation induced plasticity (TRIP) steels. In this paper are presented the results of physical and numerical modeling of heat treatment the experimental complex-phase steel, witch be conducted in the Institute of Modeling and Automation of Plastic Working Processing on Częstochowa University of Technology. The numerical modellig of heat treatment were carried with using the commercial programe TTSteel. Based on the results of computer simulation the changes of steel microstructure during continuous cooling were analyzed and the characteristics temperature and CCT diagram was constructed. Numerical research have been verified by the physical simulation of heat treatment by the dilatometer DIL805. The characteristic temperature of investigated steel and the size of initial austenite grains were determined. On the samples was also metallographic examination and Vickers hardness testing conducted. The obtained results were used to build a real CCT diagram of steel.
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Jo´nsdo´ttir, Fjo´la, Glenn E. Beltz, and Robert M. McMeeking. "Modeling of Threshold Strength in Cylindrical Ceramic Structures." Journal of Applied Mechanics 72, no. 3 (May 1, 2005): 381–88. http://dx.doi.org/10.1115/1.1831296.
Повний текст джерелаАнотація:
Recently, three-dimensional structured ceramic composites with large threshold strengths (i.e., stress below which there is zero probability of failure) have been fabricated utilizing an architecture consisting of relatively stress-free, elongated prismatic domains, separated by thin compressive walls. We build upon prior work on laminate architectures, with the common feature that these structures are all susceptible to fracture. Typically, these three-dimensional structures consist of thin shells of mullite that surround alumina. Cracks, originating from large flaws within the ceramic body, are arrested by the surrounding compressive layers until a specific stress level is attained (i.e., the threshold strength), resulting in a truncation of the strength distribution in the flaw region. A preliminary stress intensity solution has shown that this arrest is caused by a reduction of the crack driving force by the residual compression in the compressive walls. This solution also predicts that the threshold strength is dependent not only on the magnitude of the residual compression in the walls but also on the dimensions of both phases. A finite element model is presented that utilizes a penny-shaped crack in the interior of such a structure or half-penny-shaped crack emanating from the edge of such a structure. Ongoing analytical and experimental work that is needed to more fully understand this arrest phenomenon and its application towards the development of reliable, damage-tolerant ceramic components are discussed.
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Oh, Gyoko, and Yoshiaki Akiniwa. "Bending fatigue behaviour and microstructure in welded high-strength bolt structures." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 10 (November 22, 2018): 3557–69. http://dx.doi.org/10.1177/0954406218813391.
Повний текст джерелаАнотація:
Welded high-strength bolts are recently being applied to automobile part fixations, and it is important to clarify their fatigue behaviours and to carry out the fatigue strength designs for preventing fatigue failures. Using the spot and full-circled welded bracket samples in four kinds of weld shapes, bending fatigue strength properties of welded high-strength bolt structures were examined. Factors affecting fatigue to failure, such as weld bead shapes and metal structures, were identified through local stress measurements with strain gauges and X-ray diffractions, microscope observations and chemical composition analyses, as well as stress concentrations of finite element method computational simulation. Differences of bending fatigue strengths at 2 × 105 cycles in welded bolt structure samples when based on nominal stress are 15% to 60% compared with the bolt itself. Fatigue strengths corresponded to four kinds of fracture modes and did not decline greatly in the full-circled welded structure. The spot P sample, in which the connecting line between the two centres of the weld beads was perpendicular to the load direction, has higher strength due to the crack initiating from the weld zone of the gap between the plate and the bolt flange which has hard mixed phases of ferrite + martensite + bainite with high fatigue resistance, and its strength divided by weld length does not deteriorate. The strengths and fracture modes were analysed from the viewpoints of the shape effect relating to the stress concentration and residual stress and the material effect relating to the microstructure of the weld as well.
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Steendam, Gosse Jan, Jentsje Wouter Van der Meer, Andre Van Hoven, and Astrid Labrujere. "WAVE RUN-UP SIMULATIONS ON REAL DIKES." Coastal Engineering Proceedings, no. 35 (June 23, 2017): 42. http://dx.doi.org/10.9753/icce.v35.structures.42.
Повний текст джерелаАнотація:
A new Wave Run-up Simulator has been designed, constructed, calibrated and used for testing of the seaward face of dikes. The upper part of dikes or levees often have a clay layer with a grass cover. The new device is able to test the strength of the grass cover under simulation of up-rushing waves for pre-defined storm conditions. The cumulative overload method has been developed to describe the strength of grass covers on the crest and landward side of dikes, for overtopping wave volumes. In essence there is not a lot of difference between the hydraulic load from an overtopping wave volume or from an up-rushing wave. Therefore the hypothesis has been evaluated that the cumulative overload method should also be applicable for up-rushing waves. Tests on a real dike have been used to validate this hypothesis. The main conclusions are that the new Wave Overtopping Simulator works really well, but that the results on testing till so far has not yet been sufficient for a full validation of the method. More research is required. Furthermore, a new technique has been developed to measure the strength of a grass sod on a dike: the grass pulling device. Tests with this device showed that it is possible to measure the critical velocity (= strength) of a grass cover, which is much easier than performing tests with a Wave Run-up or Overtopping Simulator.
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Corredor, Antonio, Rafael Torres, Juan Vicente Miñana, Enrique Fernández, Carlos Fermín Menéndez, Moisés Santos, M. Esther Gómez-Martín, and Josep R. Medina. "DROP TEST OF PROTOTYPE CUBE AND CUBIPOD ARMOR UNITS." Coastal Engineering Proceedings 1, no. 32 (January 30, 2011): 43. http://dx.doi.org/10.9753/icce.v32.structures.43.
Повний текст джерелаАнотація:
The structural strength of concrete armor units (CAUs) is a key factor in the design and construction of armor layers for large mound breakwaters. This paper describes the prototype drop tests carried out to assess the structural strength of conventional cube and Cubipod CAUs. Low intensity overturning tests, high intensity free fall tests and extreme intense free fall tests were conducted to measure the structural integrity under impact loads of the Cubipod CAU
compared to the conventional cubic block. The casting systems and pressure clamps were specifically designed to manufacture and handle the 15-tonne conventional cube and 16-tonne Cubipod prototypes used for the drop tests.
Two reinforced-concrete platforms were used for overturning and free fall tests. The 16-tonne Cubipod prototypes withstand drops more than 50% higher than 15-tonne conventional cube prototypes of similar concrete strength. Two extreme free fall tests verified the robustness of Cubipod prototypes in accidental falls during construction. Both Cubipod and conventional cube CAUs have similar stacking and handling procedures as well as manufacturing cycle
time.
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Ma, Yan, Muxin Yang, Fuping Yuan, and Xiaolei Wu. "A Review on Heterogeneous Nanostructures: A Strategy for Superior Mechanical Properties in Metals." Metals 9, no. 5 (May 24, 2019): 598. http://dx.doi.org/10.3390/met9050598.
Повний текст джерелаАнотація:
Generally, strength and ductility are mutually exclusive in homogeneous metals. Nanostructured metals can have much higher strength when compared to their coarse-grained counterparts, while simple microstructure refinement to nanoscale generally results in poor strain hardening and limited ductility. In recent years, heterogeneous nanostructures in metals have been proven to be a new strategy to achieve unprecedented mechanical properties that are not accessible to their homogeneous counterparts. Here, we review recent advances in overcoming this strength–ductility trade-off by the designs of several heterogeneous nanostructures in metals: heterogeneous grain/lamellar/phase structures, gradient structure, nanotwinned structure and structure with nanoprecipitates. These structural heterogeneities can induce stress/strain partitioning between domains with dramatically different strengths, strain gradients and geometrically necessary dislocations near domain interfaces, and back-stress strengthening/hardening for high strength and large ductility. This review also provides the guideline for optimizing the mechanical properties in heterogeneous nanostructures by highlighting future challenges and opportunities.
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Naji, Arash, and Fereidoon Irani. "P-∆ Effects in Steel Structures Using Yield Point Spectra." Advanced Materials Research 255-260 (May 2011): 477–81. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.477.
Повний текст джерелаАнотація:
Yield Point Spectra (YPS) are used to indicate the influence of P-∆ effects on the lateral strengths of structures with constant ductility demands. The intensity of P-∆ effects is represented by an index, called the effective height, heff . Both the yield displacement and the effective height are stable parameters, even when the structure shows nonlinear behavior. The strength ratio, n, is defined as the ratio of lateral strength associated with P-∆ effect at the peak displacement and the total strength developed at the peak displacement response. In this paper by Ploting strength ratio(n) vs. yield displacement , the influence of P-∆ effects has been verified.
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Wolfe-Quintero, Kate. "The connection between verbs and argument structures: Native speaker production of the double object dative." Applied Psycholinguistics 19, no. 2 (April 1998): 225–57. http://dx.doi.org/10.1017/s0142716400010055.
Повний текст джерелаАнотація:
AbstractThis study is an investigation of the patterns and strength of the connections between English dative verbs and the double object dative (DOD) argument structure in native speaker production. The subjects completed three written production tasks using dative and other verbs from different semantic classes of verbs. The results show that alternating dative verbs varied in their patterns of connection to argument structures, but were consistent in the strength of their connection to the DOD argument structure across subjects and tasks. There was no support for production differences due to verb class membership, but the results do support a model of lexical representation that represents variable strengths of association between individual verbs and argument structures. With respect to the design of production and processing studies, the results do not support the treatment of alternating dative verbs as a unitary group, nor a priori assumptions about relative argument structure complexity between alternating and nonalternating verbs, but do support the use of production tasks to determine individual verb argument structure preferences.
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Mustafa, Alef, and Emin Cadar. "Pharmaceutical Uses of Chitosan in the Medical Field." European Journal of Interdisciplinary Studies 1, no. 3 (December 30, 2015): 35. http://dx.doi.org/10.26417/ejis.v1i3.p35-40.
Повний текст джерелаАнотація:
Two of the considerably versatile and promising biomaterials are chitin and chitosan. Chitin is known to be the most abundant natural amino mucopolysaccharide, produced annually almost as much as cellulose, and it is found in the structure of a wide number of intervertebrates ( crustaceans’ exoskeleton, insects’ cuticles) functioning as a structural component that provides strenght and protection to the organisms, and the cell walls of fungi, among others. On the other hand, chitosan only occurs naturally in some fungi (mucoraceae). The composition of chitin is based on ?(1à4)-linked 2-acetamido-2-deoxy-?-D-glucose (N-acetylglucosamine). Due to their natural origin, both chitin and chitosan are defined as a family of polymers which present a high variability in their chemical and biological properties such as biocompatibility, biodegradability, mucoadhesion, anticholesterolemic, antitumoral, hemostatic and antimicrobial effect. These characteristics of chitin and chitosan have a major influence on the their properties and depending on the DD (degree of dezacetilation) and Mw (molecular weight), they are used in a variety of medical applications such ascosmetics, artificial skin, wound-dressings, water engeneering, opthalmology, drug-delivery system. The aim of this review is to highlight the physicochemical properties of chitin and chitosan used in the wound healing process.It is known that in the last years, the number of pacients suffering from wounds and burns difficult to treat and heal has increased. During the wound healing process, the dressing protects the injury and contributes to the recovery of dermal and epidermal tissues. Due to their high biocompatibility, biodegradability and similarity to the human body macromolecules these natural polysacharides (chitin and chitosan) are extensively used in wounds and burns management.
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Mustafa, Alef, and Emin Cadar. "Pharmaceutical Uses of Chitosan in the Medical Field." European Journal of Interdisciplinary Studies 3, no. 1 (December 30, 2015): 35. http://dx.doi.org/10.26417/ejis.v3i1.p35-40.
Повний текст джерелаАнотація:
Two of the considerably versatile and promising biomaterials are chitin and chitosan. Chitin is known to be the most abundant natural amino mucopolysaccharide, produced annually almost as much as cellulose, and it is found in the structure of a wide number of intervertebrates ( crustaceans’ exoskeleton, insects’ cuticles) functioning as a structural component that provides strenght and protection to the organisms, and the cell walls of fungi, among others. On the other hand, chitosan only occurs naturally in some fungi (mucoraceae). The composition of chitin is based on ?(1à4)-linked 2-acetamido-2-deoxy-?-D-glucose (N-acetylglucosamine). Due to their natural origin, both chitin and chitosan are defined as a family of polymers which present a high variability in their chemical and biological properties such as biocompatibility, biodegradability, mucoadhesion, anticholesterolemic, antitumoral, hemostatic and antimicrobial effect. These characteristics of chitin and chitosan have a major influence on the their properties and depending on the DD (degree of dezacetilation) and Mw (molecular weight), they are used in a variety of medical applications such ascosmetics, artificial skin, wound-dressings, water engeneering, opthalmology, drug-delivery system. The aim of this review is to highlight the physicochemical properties of chitin and chitosan used in the wound healing process.It is known that in the last years, the number of pacients suffering from wounds and burns difficult to treat and heal has increased. During the wound healing process, the dressing protects the injury and contributes to the recovery of dermal and epidermal tissues. Due to their high biocompatibility, biodegradability and similarity to the human body macromolecules these natural polysacharides (chitin and chitosan) are extensively used in wounds and burns management.
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Cahyadi, Ady, and Anwar Salahuddin. "ANALISIS BUSINESS MODEL CANVAS PADA SYAHIDA INN DALAM MENCARI ALTERNATIF STRATEGI BISNIS BADAN LAYANAN UMUM UIN SYARIF HIDAYATULLAH JAKARTA." KEUNIS 10, no. 1 (February 14, 2022): 100. http://dx.doi.org/10.32497/keunis.v10i1.3221.
Повний текст джерелаАнотація:
<p><em><span lang="EN-US">The development of the hotel sector in the pandemic covid-19 currently decrease so as prosecuting the business doers to survive and grow the business including Syahida Inn as a business units of Syarif Hidayatullah Jakarta The State Islamic University (UIN Jakarta). Therefore it is need of a business model exact to Syahida Inn knows how to run effectively, efficient, and economical. The purpose of this research is to develop the business model in the future. The kind of research is descriptive qualitative with bussiness model canvas (BMC) and strenght weakness opportunity threat (SWOT) approach. The result showed that the creation of value propositions in the future is sharia hotel, meeting room, wedding hall, cafe and restaurant with convenience, comfortable and hospitality in order will affect every element business model canvas there is an increase in the primary resource, owned the key activity, revenue streams, and increase the cooperation partners. The element of cost structure occured additional cost in promotion while on a customer segment focus to individual and government institutions. SWOT Analysis showed, Syahida Inn is in the first quadrant mean are in progressive strategy with the main focus on market penetration by increasing the promotion either online or offline, focus on market development with the introduction of products to the Tangerang Raya, Province of Banten and Province of Jakarta, and the latter focus on the product development by increasing the meeting facilities, wedding hall, cafe/restaurant, fitness center, and the auditorium/theatre room.</span></em></p>
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Hwang, Eui Hwan, Jin Man Kim, and Sun Gyu Park. "Physical Properties of Polyester Polymer Concrete Composite Using RCSS Fine Aggregate." Advanced Materials Research 687 (April 2013): 219–28. http://dx.doi.org/10.4028/www.scientific.net/amr.687.219.
Повний текст джерелаАнотація:
For the recycling of rapid-cooled steel slag (RCSS), various specimens were prepared with the different replacement ratios of RCSS and the addition ratios of polymer binder. The physical properties of these specimens were then investigated by compressive strength test, flexural strength test, water absorption test, hot water resistance test, measurement of pore distribution and observation of micro-structures using scanning electron microscope(SEM). Results showed that compressive and flexural strength increased with the addition ratios of polymer binder and replacement ratios of RCSS, but those strengths decreased reversely when addition ratio of polymer binder and replacement ratio of RCSS were excessively high. By the hot water resistance test, the compressive strength and flexural strength decreased remarkably and total pore volume increased but bulk density decreased. SEM observation of structure before hot water resistance test revealed very compact infusion of structure but decomposition or thermal degradation appeared in polymer binder when observed after the hot water resistance test.
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Macák, M., and K. Krištof. "The effect of granulometric structure and moisture of fertilizer on its static strength." Research in Agricultural Engineering 62, Special Issue (December 28, 2016): S1—S7. http://dx.doi.org/10.17221/31/2016-rae.
Повний текст джерелаАнотація:
During the load of vertical static force the strength limit of individual fertilizer particles was studied in relation to the fertilizer moisture content and granulometric composition. The experiment was conducted for the fertilizer damage at the different level of fertilizer moisture content and particle size groups. The result of the first part indicates the need to point out the differences of static strength between prilled and granular fertilizers. Both types of prilled fertilizers reached from 3 to 8 times lower values of static strength than standard granular fertilizers. The theses above point out the need for more caution during manipulation, storage and application of prilled fertilizers, the quality of which may be affected at some point by the greater extent of static load. The second part of the study was focused on the effect of moisture and granulometric fraction of fertilizer on static strength of fertilizer. For all tested fertilizers the statistical difference was observed for both of variation factors. Their mutual ratio of the effect is however different for each individual fertilizer. This fact may be interpreted as the dependence of the quantity of water that the individual fertilizers are able to absorb. This amount was influenced by very different types of fertilizers’ hygroscopicity. The interaction of both factors at the same time was not confirmed for any fertilizer tested.
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Takakuda, K., H. Matsumoto, Y. Koyama, S. Asoda, T. Arita, and H. Koshitomae. "Strength and Structure of Fibrous Tissues under Mechanical Stimuli(Micro- and Nano-biomechanics)." Proceedings of the Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2004.1 (2004): 211–12. http://dx.doi.org/10.1299/jsmeapbio.2004.1.211.
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Kawabata, T., H. Akimune, H. Fujita, M. Fujiwara, K. Hara, K. Hatanaka, K. Nakanishi та ін. "2α + t cluster state in 11B". Modern Physics Letters A 21, № 31n33 (30 жовтня 2006): 2383–92. http://dx.doi.org/10.1142/s021773230602202x.
Повний текст джерелаАнотація:
The cluster structures of the excited states in 11 B are studied by analyzing the isoscalar monopole and quadrupole strengths in the 11 B (d,d′) reaction at Ed = 200 MeV . The excitation strengths are compared with the predictions by the shell-model and antisymmetrized molecular-dynamics (AMD) calculations. It is found that the large monopole strength for the [Formula: see text] state at Ex = 8.56 MeV is well described by the AMD calculation and is an evidence for a developed 2α + t cluster structure.
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Kurkjian, C. R., and P. K. Gupta. "Intrinsic strength and the structure of glass." Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B 61, no. 6 (December 12, 2020): 239–47. http://dx.doi.org/10.13036/17533562.61.6.kurkjian.
Повний текст джерелаАнотація:
Intrinsic strength is the strength of a glass without extrinsic flaws. Knowledge of the composition dependence of the intrinsic strength is important both technologically for the development of high strength glass compositions and theoretically as it may provide important structural information. Intrinsic strength is easy to define but difficult to measure experimentally. In this paper we discuss intrinsic (σ*) strength measured in normal laboratory conditions as well as the inert intrinsic (σ0*) strength. We define these terms in a rigorous manner and indicate how to gauge if they have been measured by developing a set of criteria. Based on these criteria, we tabulate those values of intrinsic strengths that have been measured to date.
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Bilisik, Kadir, Gulhan Erdogan, and Erdal Sapanci. "Interlaminar shear properties of nanostitched/nanoprepreg aramid/phenolic composites by short beam method." Journal of Composite Materials 53, no. 21 (November 14, 2018): 2941–57. http://dx.doi.org/10.1177/0021998318811523.
Повний текст джерелаАнотація:
The interlaminar shear strengths of nanostitched 3D aramid/phenolic composites were studied. Stitching slightly improved the interlaminar strength of the z-stitching/nanotube composites. In addition, the stitching fiber type influenced the interlaminar strength of the z-stitching/nanotube aramid/phenolic composites. The failures of all structures in the compression and tensile sides were almost negligible. However, all structures had interlaminar shear failure where delamination in z-stitching/nanotube composites was arrested. The introduction of the stitching yarn in the baseline structure improved its out-of-plane failure properties without reducing the in-plane properties. The effects of stitching and multiwall carbon nanotubes on the 3D aramid/phenolic composite were encouraging and the nanostitched para-aramid/phenolic nanocomposite could be considered as damage tolerance material.
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Li, Xiuping, Wenhui Wang, Shouyin Wang, Yuqing Shen, Jinfeng Pan, Xiuping Dong, and Shengjie Li. "The Solubility and Structures of Porcine Myofibrillar Proteins under Low-Salt Processing Conditions as Affected by the Presence of L-Lysine." Foods 11, no. 6 (March 17, 2022): 855. http://dx.doi.org/10.3390/foods11060855.
Повний текст джерелаАнотація:
This study aimed to investigate the presence of L-lysine (Lys) on the solubility and structures of myofibrillar proteins (MFPs) at different ionic strengths. Porcine MFPs were incubated at 4 °C with various levels of ionic strengths (0.15, 0.3, or 0.6 M NaCl) with or without the presence of 20 or 40 mM Lys. After 24 h of incubation, MFP solubility and turbidity were determined, and the particle size distribution, circular dichroism spectra, and intrinsic tryptophan fluorescence of MFP were analyzed to obtain their secondary and tertiary structure. Results showed that the solubilization effects of Lys on MFPs are dependent on the ionic strength. Particularly, the presence of Lys could improve MFP solubility at 0.3 M, which resembles salt-reducing processing conditions. Concomitantly, the secondary and tertiary structures were observed to change as a result of the varying ionic strengths and the addition of Lys, including myofibril swelling, dissociation of myosin filaments, uncoiling of α-helix, and unfolding of the tertiary structure. The possible mechanisms underlying the solubilization effects of Lys on MFPs at low ionic strengths are discussed from the perspective of protein structural changes.
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Kevin, MARIETTE, and OKUYAMA Keichi. "Impact of the materials strength of a small satellite structure on its natural frequencies." Proceedings of Mechanical Engineering Congress, Japan 2016 (2016): S1920104. http://dx.doi.org/10.1299/jsmemecj.2016.s1920104.
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Esteban, Miguel, Francisco Arriaga, Guillermo Íñiguez, Ignacio Bobadilla, and Raquel Mateo. "Influencia de las fendas en la resistencia de la madera estructural." Materiales de Construcción 60, no. 299 (March 24, 2010): 115–32. http://dx.doi.org/10.3989/mc.2010.48208.
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Steeg, Paul Van, Mark Klein Breteler, and Astrid Labrujere. "USE OF WAVE IMPACT GENERATOR AND WAVE FLUME TO DETERMINE STRENGTH OF OUTER SLOPES OF GRASS DIKES UNDER WAVE LOADS." Coastal Engineering Proceedings 1, no. 34 (October 30, 2014): 60. http://dx.doi.org/10.9753/icce.v34.structures.60.
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Yeh, Meng Kao, and Yu Wen Chiu. "Finite Element Analysis of Centrally-Debonded Composite Sandwich Beam under Four Point Bending." Advanced Materials Research 335-336 (September 2011): 351–54. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.351.
Повний текст джерелаАнотація:
Sandwich structure, with high specific strength, high specific stiffness facesheet and light-weighted core material bonded together, is one of commonly used composite structures. During the manufacturing process, it is possible to have debonding between facesheet and core. This facesheet/core debonding affects the mechanical property and strength of sandwich structure. In this study, sandwich beams are made of graphite/epoxy laminate as facesheet and MWNTs/epoxy nanocomposites as core material. The composite sandwich beam, with a central facesheet/core debond and under four point bending, was analyzed by the finite element method. The length of the debonding layer, the fiber orientation of the facesheet laminate and MWNTs content in core were varied to assess their effects on the bending behavior and the strengths of the centrally-debonded sandwich beams.
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Marsh, M. Lee, and Colin B. Brown. "Effects of Column Flexural Strength on the Seismic Response of a Multiple-Column Bridge Bent." Earthquake Spectra 10, no. 4 (November 1994): 757–76. http://dx.doi.org/10.1193/1.1585796.
Повний текст джерелаАнотація:
The effect of varying column flexural strengths on the seismic performance of a pre-1970, reinforced concrete multiple-column bridge bent was investigated. The strength variations may arise from poor detailing, retrofitting of existing structures, over- or under-design, or construction errors. The seismic behavior of the system was determined using inelastic response history analysis. The effects of possible strength variations were evaluated with respect to a base level of expected performance, with respect to various foundation flexibilities, and with respect to ground shaking intensity. The analyses show that the distribution of inelastic demands within the system is sensitive to foundation restraint and relatively insensitive to small flexural strength changes. The analyses also show that changes in the column strength in one location may increase the damage potential at other locations within the structure.
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Bijlard, Roel, Gosse Steendam, Henk Verhagen, and Jentsje Van der Meer. "DETERMINING THE CRITICAL VELOCITY OF GRASS SODS FOR WAVE OVERTOPPING BY A GRASS PULLING DEVICE." Coastal Engineering Proceedings, no. 35 (June 23, 2017): 20. http://dx.doi.org/10.9753/icce.v35.structures.20.
Повний текст джерелаАнотація:
DETERMINING THE CRITICAL VELOCITY OF GRASS SODS FOR
WAVE OVERTOPPING BY A GRASS PULLING DEVICE
Roel Bijlard, Delft University of Technology, roelbijlard@gmail.com
Gosse Jan Steendam, INFRAM International, gosse.jan.steendam@infram.nl
Henk Jan Verhagen, Delft University of Technology, h.j.verhagen@tudelft.nl
Jentsje van der Meer, Van der Meer Consulting bv, jm@vandermeerconsulting.nl
INTRODUCTION
There is a shift in the approach for designing coastal
structures in the Netherlands, such as dikes or levees.
In the past dikes were designed on the probability of
exceedance of the water level during specific incoming
(wave) storm conditions. In the near future the design
criterion will be the probability of flooding of the
hinterland. In order to determine this flood probability,
the strength of the dike has to be known at which
failure occurs. During extreme storm conditions waves
will overtop the crest which can lead to erosion of the
grass sod on the landward slope. This can finally result
in instability of the dike and flooding of the hinterland.
Past research focused on the erosion of the grass sod
during different wave overtopping conditions, see
Steendam 2014. The last few years many tests have
been performed with the Wave Overtopping Simulator.
During these tests the Cumulative Hydraulic Overload
Method has been developed, see Van der Meer 2010
and Steendam 2014. With this method an estimation
of the critical velocity of the grass sod has to be made.
The critical velocity is a strength parameter for a grass
sod on a dike during loads induced by overtopping
wave volumes.
SOD PULLING TESTS
For safety assessments it would be beneficial if there
is also an easier way to determine the critical velocity
of the grass sod. However, it is important to measure
the actual strength of the grass cover, so a visual
inspection cannot be satisfactory. The sod pulling
test is developed in order to investigate the
resistance of the grass cover. It lifts the grass sod
perpendicular to the slope out of the sod and
measures the force as a function of the deformation.
In order to lift the sod, a pull frame is anchored into
the top layer with pins. This frame then is lifted out of
the grass sod by a hydraulic cylinder.
In order to insert the pins into the sod, the soil has to
be excavated on two sides (condition 2 test) or on all
4 sides (condition 4 test). This has the disadvantage
that the strength of an intact sod cannot be
measured directly. So a methodology is developed to
estimate the strength of an intact grass sod from the
measured data. A further introduction on the sod
pulling tests is given in Steendam 2014. The goal is
to rewrite the measured forces from the sod pulling
test into a critical velocity so that the Cumulative
Hydraulic Overload Method can be used for
determining the flooding probability of a dike.
Some of the locations tested with the wave
overtopping simulator have also been tested for the
strength of the grass cover with the sod pulling tests.
The two methods use the same failure mechanism of
the grass, erosion of the grass sod.
The top layer of a dike consists of soil and roots
growing in multiple directions. The roots anchor the
grass into the soil and can deform centimeters
without tearing. Pressures acting on the grass cover
will first break the weakest roots, but the forces will
be redistributed to other roots. Only when a critical
amount of roots are broken, the redistribution stops
and the grass cover will fail.
CONCLUSION
It is possible to rewrite the measured forces with the
sod pulling tests into a critical grass normal stress
(σgrass.c), which is one of the input parameters for
determining the critical velocity of a grass sod, see
Hoffmans 2012.
The equation also uses the pore water pressure (pw),
the relative turbulence intensity (r0) and the density of
the water (Ï). When the critical velocity resulting from
this equation is compared with the determined critical
velocity during the wave overtopping simulations,
there is good correspondence between the values for
the five tested locations. So the sod
pulling test could provide results that are reliable
enough to determine the critical velocity of a dike
section. Further elaboration and scientific background
will follow in the paper after the conference.
REFERENCES
Hoffmans (2012): The influence of turbulence on soil
erosion. Eburon, Delft.
Steendam, van Hoven, van der Meer, Hoffmans
(2014): Wave Overtopping Simulator tests on
transitions and obstacles at grass covered slopes of
dikes, proc. ICCE 2014 Seoul.
Van der Meer, Hardeman, Steendam, Schüttrumpf,
Verheij (2010): Flow depths and velocities at crest
and inner slope of a dike, in theory and with the Wave
Overtopping Simulator, Proc. ICCE 2010, Shanghai.
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Şengör, A. M. C., Nalan Lom, and Nurbike G. Sağdıç. "Tectonic inheritance, structure reactivation and lithospheric strength: the relevance of geological history." Geological Society, London, Special Publications 470, no. 1 (March 15, 2018): 105–36. http://dx.doi.org/10.1144/sp470.8.
Повний текст джерелаАнотація:
AbstractTectonic inheritance and structure reactivation have been of interest to geologists since it was noticed in the mid-nineteenth century that younger structures in an area tend to follow the direction of older structures. Three kinds of relationship may exist between these older and younger structures: younger structures may follow the older ones and repeat their function; younger structures may follow older ones, but function in the opposite sense to the older ones; and younger structures bear no relation to the older ones. These are named, respectively, resurrected, replacement and revolutionary structures. We present three examples, on three different scales, of tectonic inheritance and structure reactivation: Mesozoic and Cenozoic Europe on a continental scale; the US Rockies on a regional scale; and the Albula Pass in the Swiss Alps on an outcrop scale. We conclude that structure reactivation on a crustal scale occurs when the protective armour of the mantle lithosphere is removed and that, in such cases, resurrected and replacement structures form. In cratons with thick lithospheric roots, structure reactivation hardly ever occurs and when, in rare cases, it does occur, it commonly generates revolutionary structures. There can be no unique model for lithospheric strength.
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Megherhi, M. H., G. O. Dayton, T. R. Shrout, and J. J. Mecholsky. "Indentation fracture of lead magnesium niobate-based multilayer composite structures." Journal of Materials Research 5, no. 3 (March 1990): 515–23. http://dx.doi.org/10.1557/jmr.1990.0515.
Повний текст джерелаАнотація:
The effects of internal electrodes on the fracture properties of relaxor ferroelectric 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 multilayer structures were studied. It was observed that the position of the first electrode layer from the surface is critical to the strength and toughness of the multilayer structure. Positioning the electrode close to the surface was found to enhance interaction with cracks which initiate on the multilayer surface. This interaction limits the effective crack length and therefore increases the fracture strength and effective toughness of the composite. Samples indented parallel to the electrodes exhibited higher fracture strengths and toughness than those indented perpendicular to the conducting layers. Both parallel and perpendicular orientations gave higher strength and toughness than the control specimens (without electrodes).
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WATKINS, RAM, H. W. PANG, and D. P. MCNICHOLL. "A COMPARISON BETWEEN CUBE STRENGTHS AND IN SITU CONCRETE STRENGTH DEVELOPMENT.,UBE STRENGTHS AND IN SITU CONCRETE STRENGTH DEVELOPMENT." Proceedings of the Institution of Civil Engineers - Structures and Buildings 116, no. 2 (May 1996): 138–53. http://dx.doi.org/10.1680/istbu.1996.28282.
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Araki, Susumu, Kazuo Ishino, and Ichiro Deguchi. "STABILITY OF GIRDER BRIDGE AGAINST TSUNAMI FLUID FORCE." Coastal Engineering Proceedings 1, no. 32 (January 27, 2011): 56. http://dx.doi.org/10.9753/icce.v32.structures.56.
Повний текст джерелаАнотація:
The horizontal and vertical components of the fluid force and pressure acting on a girder bridge due to tsunami like a solitary wave are measured in a hydraulic experiment and their characteristics are discussed. The peak of the impact fluid force is estimated on the basis of the change in the added mass of the structure. The wave pressure acting on the seaward side of the girder of the bridge is also estimated. The critical force for the stability of the girder bridge is estimated as the strength of bolts used in the shoes against shear stress.