Academic literature on the topic 'Fem-sf'
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Journal articles on the topic "Fem-sf"
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Wu, Han Heng, Tian Hua Zhou, and Yu Shi. "Research on Cooperative Working Performance of Cold-Formed Steel Stud Wall - Steel Frame Structure." Advanced Materials Research 446-449 (January 2012): 2501–6. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.2501.
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Research on cooperative working performance of cold-formed steel stud wall(CFSW) and steel frame(SF) was carried out by analytical method and finite element method. The practical calculation methods of shear force and horizontal displacement for CFSW - SF structure under horizontal load were presented. The superposition principle between CFSW and SF in elastic stage was verified in terms of strength and stiffness. The investigation by FEM indicates that the shear force distribution in elastic stage is in accord with lateral stiffness of CFSW and SF, the shear force distribution rate of CFSW declines along with the increasing of horizontal displacement while thar of SF increases because lateral stiffness of SF degenerates more slowly than that of CFSW.
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Chu, Li Ming, Wang Long Li, Qie Da Chen, Chi Chen Yu, and Chi Yang Yeh. "Effects of Surface Forces on Pure Squeeze Elastohydrodynamic Lubrication Motion of Circular Contacts with Coated Layer." Key Engineering Materials 642 (April 2015): 104–9. http://dx.doi.org/10.4028/www.scientific.net/kem.642.104.
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The effects of surface forces (SF) on pure squeeze elastohydrodynamic lubrication (EHL) motion of circular contacts with coated layer are explored under constant load condition by using the finite element method (FEM) and the Gauss-Seidel iteration method. The difference between SFEHL model and EHL model is apparent as the film thickness is thinner than 5 nm. The oscillation phenomena in pressure and film thickness come mainly from the action of solvation forces. The effects of surface forces become significant as the film thickness becomes thinner.
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Syuhada, Syahidus, Zakaria Zakaria, Rahmat Kurniawan, and Erdina Tyagita Utami. "ANALISIS MODEL ELEMEN HINGGA PERKUATAN LERENG MENGGUNAKAN SOIL NAILING (STUDI KASUS : LERENG DAERAH LAHAT, SUMATERA SELATAN)." FROPIL (Forum Profesional Teknik Sipil) 8, no. 1 (June 29, 2020): 36–45. http://dx.doi.org/10.33019/fropil.v8i1.1721.
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ntuk menghadapi masalah kelongsoran lereng, banyak metoda yang digunakan, misalnya mengubah geometri dari lereng, membuat perkuatan dinding penahan tanah, vegetasi, dan masih banyak lainnya. Salah satu ,metoda yang banyak digunakan adalah soil nailing. Perkuatan lereng dengan menggunakan soil nailing yaitu dengan memanfaatkan tiang beton bertulang yang dimasukkan ke tanah. Tanah dan beton bertulang diharapkan membentuk suatu struktur yang kuat di depan lereng, seperti prinsip perkuatan dengan timbunan dengan geosintetik. Seiring dengan berkembangnya metoda komputasi, dapat digunakan program komputer dengan basis perhitungan metoda elemen hingga. Untuk memodelkan perkuatan soil nailng tidak tersedia di dalam program elemen hingga, sehingga digunakan pendekatan material untuk memodelkan hasil perkuatan yang mendekati perilaku dari soil naling. Telah banyak dimodelkan struktur perkuatan lereng soil nailing dengan model plate dan geogrid. Untuk perilaku dari soil nailing cenderung menyerupai elemen node to node pada program FEM tersebut, sehingga patut untuk diketahui perilaku soil nailing ketika dimodelkan dengan node to node. Analisis model dilakukan dengan variasi panjang penanaman soil nailing dan kemiringan soil nailing. Dari hasil permodelan dapat dilihat perilaku material node to node mendekati hasil SF dengan material set geogrid. Semakin besar sudut pemasangan, hasil SF relatif sama. Perbedaan antara hasil SF dari material set geogrid / node to node dengan plate adalah sebesar 0.02 % - 5.12%.
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Alam, Alamsyah, Rodlian Jamal Ikhwani, Taufik Hidayat, and Suardi. "KEKUATAN FIBERGLASS REINFORCED PLASTIC (FRP) SEBAGAI BAHAN GADING KAPAL KAYU." Wave: Jurnal Ilmiah Teknologi Maritim 15, no. 1 (August 18, 2021): 1–10. http://dx.doi.org/10.29122/jurnalwave.v15i1.4719.
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Penggunaan baja untuk menggantikan kayu Bitti sebagai bahan konstruksi gading kapal kayu dinilai tidak praktis karena melalui proses pembentukan dan pemeliharaan, sehingga penggunaan bahan lain seperti FRP sangat penting. Penelitian ini bertujuan untuk mengetahui ukuran dan bentuk penampang bahan FRP yang sesuai sebagai pengganti gading kayu ditinjau dari segi kekuatan. Metode yang digunakan yaitu elemen hingga (FEM) dan dianalisis menggunakan metode eksperimen numerik pada software. Penelitian ini bersifat kualitatif dengan mengoptimalkan bahan FRP dengan bentuk penampang I beam, I beam+flange, box of hole beam, T beam, dan U beam+flange sebagai pengganti bahan kayu Bitti. Hasil penelitian menunjukkan gading kayu Bitti memiliki elastisitas (E) = 9534.02 MPa dan momen inersia penampang (I) = 2197x104 mm4 terjadi tegangan maksimum (?k) = 7.682 N/mm2 dan lendutan maksimum (?) = 0.1 mm, untuk faktor keamanan gading kayu Bitti (Sf) = 1.28, sedangkan bahan FRP pengganti gading kayu dengan nilai (E) = 69000 MPa dapat digunakan penampang I beam dengan nilai I = 316x104 mm4, I beam+flange dengan nilai I = 288x104 mm4, box of hole beam dengan nilai I = 317x104 mm4, T Beam dengan nilai I = 478 x104 mm4, serta U beam+flange dengan nilai I = 375x104 mm4, terjadi tegangan maksimum (?k) = 52.00 N/mm2 dengan lendutan maksimum (?) < 0.082 mm dan faktor keamanan (Sf) = 1.28. Bahan FRP pengganti kayu gading membutuhkan momen inersia penampang sebesar 1/7~1/5 kali lebih kecil dari momen inersia penampang kayu gading dengan elastisitas tujuh kali lebih besar dari kayu gading. Nilai ini dapat dijadikan patokan untuk ukuran kapal di atas ataupun di bawah 70 GT ketika akan menggunakan bahan FRP sebagai pengganti gading kayu.
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Ucok Mulyo Sugeng and Deniyanto. "PERHITUNGAN LENGAN EXCAVATOR KAPASITAS 450 KG UNTUK LABORATORIUM." TEKNOSAINS : Jurnal Sains, Teknologi dan Informatika 7, no. 2 (July 31, 2020): 92–106. http://dx.doi.org/10.37373/tekno.v7i2.11.
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Dewasa ini sistem hidrolik banyak digunakan dalam berbagai macam industri. Salah satu alat yang menggunakan sistem hidrolik adalah hydraulic excavator atau excavator hidrolik. Penggunaan alat ini harus memperhatikan kapasitasnya. Penggunaan melampaui kapasitas berakibat kerusakan dan kecelakaan. Tujuan penelitian ini adalah untuk mengetahui kapasitas beban design vs actual dari excavator hidrolik kapasitas 450 Kg yang digunakan di laboratorium. Metode yang digunakan dalam penelitian ini adalah analisis kuantitatif yaitu Analisa mekanis pada setiap parts yg terkait dan uji analisa FEM . Dengan dilakukan perhitungan ini maka dapat diketahui kekuatan dan kapasitas lengan excavator serta cara kerja dari sistem hidrolik. Hasil dari penelitian yaitu dengan perhitungan, rangka meja penopang lengan excavator mempunyai tegangan maksimal (σ = 15.62 N/mm²) lebih kecil dari tegangan maksimal bahan (σ = 350 N/mm²), dengan SF=22,4 maka konstruksi meja penopang alat peraga lengan excavator dinyatakan aman . Sedangkan untuk kekuatan silinder hidrolik mempunyai gaya pada saat in stroke sebesar F= 20.742 N dan saat out stroke sebesar F= 27.632 N. Jika kekuatan silinder hidrolik dibandingkan dengan beban total lengan excavator yang memiliki beban design maksimal terbesar diterima oleh silinder Boom yaitu sebesar F= 9.037,05 N, nilai ini lebih kecil dibandingkan kapasitas gaya dorong silinder F= 27.632 N, maka dapat disimpulkan bahwa sistem hidrolik aman digunakan karena gaya dorong lebih besar dari beban maksimal.
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Bang, Seungmin, Ho-Seung Kim, Jae-Hong Koo, and Bang-Wook Lee. "Consideration of the Insulation Design Method on a ±200 kV Converter Valve Unit in an HVDC Converter Hall." Energies 14, no. 8 (April 19, 2021): 2296. http://dx.doi.org/10.3390/en14082296.
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A converter valve unit, which converts Alternating Current (AC) to Directing Current (DC) and DC to AC, is one of the key elements of high voltage direct current (HVDC) transmission. The insulation design of a converter valve unit should be considered for air clearance according to the DC superimposed overvoltage and the insulator that maintains the insulation performance and the corona shield to suppress DC corona discharge. There is no prescribed standard for the insulation design of a converter valve unit. Moreover, insulation performance under an applied DC voltage has not yet been thoroughly investigated. Therefore, it is necessary to study the insulation design method of the converter valve unit. In this paper, consideration of the insulation design method on a ±200 kV converter valve unit in an HVDC converter hall is performed. The finite element method (FEM) is used to simulate the 3D model. Additionally, the safety factor (SF) is applied in accordance with the dielectric test in IEC 62271-1. As a result, an insulation design process on the converter valve unit is proposed and the insulation design is carried through the design factors. It is confirmed that design factors on the air clearance, insulator and corona shield have a significant effect on a highly reliable insulation design.
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Ahmed, Asif, Sadik Khan, Sahadat Hossain, Tural Sadigov, and Prabesh Bhandari. "Safety Prediction Model for Reinforced Highway Slope using a Machine Learning Method." Transportation Research Record: Journal of the Transportation Research Board 2674, no. 8 (June 9, 2020): 761–73. http://dx.doi.org/10.1177/0361198120924415.
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Recycled plastic pin (RPP) has been proved to be an effective and inexpensive solution for shallow slope stabilization. Current practice suggests conducting numerical modeling to find out the desired factor of safety (FS) using RPP in the design of landslide repair. While the slope stability is heavily dependent on soil strength parameters and slope geometry, RPP length and spacing can also play a significant role in reaching the target factor of safety for the highway slope. During this study, a safety prediction model was developed using both statistical and machine learning (ML) approaches to use RPP in slope stabilization. Initially, parametric study was conducted using five different soil strengths, six slope heights, three slope ratios, three RPP lengths, and five RPP spacing configurations. Using the strength reduction techniques of Finite Element Modeling Software PLAXIS 2D, FS was determined for more than 1,000 combinations. Afterwards, a statistical approach was undertaken to determine a safety prediction model containing all possible parameters. Finally, an ML approach was conducted for safety model. The ML approach was found to be more accurate than the classical statistical approach with 85% accuracy of predicting the FS for an RPP reinforced highway slope. The developed model was validated against the values obtained from the numerical modeling, which indicated that the SF obtained from the developed model was in good agreement with those from finite element method (FEM) analysis.
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Ji, G. M., T. Kanstad, and Ø. Bjøntegaard. "Crack Risk Evaluation of Submerged Concrete Tunnel during Hardening Phase." Advances in Civil Engineering 2018 (December 23, 2018): 1–14. http://dx.doi.org/10.1155/2018/7354025.
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Cracking of concrete structures during the hardening phase often seriously compromises not only structure integrity but also durability and long-term service life. Especially for large massive structures, for example, concrete submerged tunnel, the reliable crack risk evaluation at the hardening phase is critical to the successful design. Mineral additives such as silica fume (SF), blast furnace slag (BFS), and fly ash (FA) have been used extensively in production of high-performance concrete in the last decades. The mineral additives such as FA and BFS not only reduce the hydration heat during the hardening phase but also have significant influence on the development of mechanic and viscoelastic properties at an early age. The main objective of the research is to propose a design methodology to select the appropriate composition of concrete for construction of the submerged tunnel. The influence of mineral additives such as FA and BFS on the risk of cracking during the hardening phase was investigated for the massive concrete structure. Five types of concrete mixes denoted as SV40, 40% BFS, 60% BFS, 40% FA, and 60% FA concrete are considered in the current study, and the measurement to reduce the initial temperature is also considered for 60% FA concrete. First, the well-documented material models are verified by calibration of restraint stress development in the TSTM test by using the finite element method (FEM), and then the 3D thermal-structural analysis is performed to assess the cracking risk for the submerged tunnel during the hardening phase. Based on analysis results, the 60% FA concrete has both the lowest maximum temperature and the lowest stress/strength ratio, and the cracking-free design based on the current study ensures the successful construction of the submerged tunnel.
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Calderon Arenas, Jose Antonio. "Axisymmetric modelling of transient thermal response in solids for application to infrared photothermal radiometry technique." Revista Mexicana de Física 65, no. 1 (December 31, 2018): 54. http://dx.doi.org/10.31349/revmexfis.65.54.
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To induce temperature changes on the sample surface by the incidence of a monochromatic modulated light beam and detect the changes produced in the thermal radiation emission is the basic principle of the infrared photothermal radiometry technique. Until now, in order to analyze the thermal response mathematical models based in an one-dimensional model were used considering a sample with a finite thickness and an infinite incidence surface, as well as, the linear approximation of the Stefan-Boltzmann Law in the calculus of the heat losses due to thermal radiation. In this work, analytical and numerical models for the 2D heat diffusion in homogenous finite solid samples, are presented. These models were obtained by solving the heat diffusion equation, under cylindrical symmetry, considering mixed boundary conditions to include radiation and convection heat losses through the surfaces of the sample, and a monochromatic Gaussian excitation beam impinging on the front of the sample. The analytical models were obtained by solving the governing equations, considering the well-known linear approximation of the Stefan-Boltzmann law in the calculus of the heat losses due to thermal radiation. To analyse the effects of the non-linearity of the heat losses by thermal radiation on the thermal transient response, in the numerical model it was taken into account the full expression of the Stefan-Boltzmann law, and the transport equation was solved numerically by means of the Finite Element Method (FEM). The analytical solution for the oscillatory thermal response reveals the close dependence of the thermal response on the ratio of thickness to the radius of the sample, represented by the form factor sf. Both, the analytical and the numerical solutions were employed to simulate the thermal response of homogenous materials, and compared with experimental results reported elsewhere by part of our same research group. Finally, the difference between the thermal response predictions, from the analytical and numerical models, were analyzed.
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Ibrahim, Mohammed, Aftab Ahmad, Mohammed S. Barry, Luai M. Alhems, and A. C. Mohamed Suhoothi. "Durability of Structural Lightweight Concrete Containing Expanded Perlite Aggregate." International Journal of Concrete Structures and Materials 14, no. 1 (September 21, 2020). http://dx.doi.org/10.1186/s40069-020-00425-w.
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Abstract This study focuses on the development of durable structural lightweight concrete (LWC) by incorporating expanded perlite aggregate (EPA) in the range of 0 to 20% by weight. In order to ensure its durability when exposed to chloride environment, concrete was produced with low water-to-cement ratio and ordinary Portland cement (OPC) was replaced with 50% and 7% ground granulated blast furnace slag (GGBFS) and silica fume (SF), respectively. The mechanical properties and durability of concrete were assessed by determining the unit weight, compressive strength, flexural strength, drying shrinkage, chloride permeability and migration, as well as resistance of concrete to corrosion of reinforcing steel. Very importantly, thermal insulation properties were determined using a hot guarded plate. In addition, a finite element model (FEM) was prepared to study the behavior of EPA-modified concrete under seismic loading. The results showed that the unit weight of concrete was reduced by 20% to 30% when compared with the normal weight concrete (NWC). The compressive strength of the developed LWC was sufficient to be used as structural concrete, particularly of those mixtures containing 10% and 15% perlite aggregate. The durability of LWC was comparable to NWC in terms of chloride diffusion and resistance of concrete to corrosion of reinforcing steel. The tangible outcomes also include the superior thermal insulation properties of LWC compared to NWC. The greater incorporation of EPA in the concrete resulted in better behavior under seismic loading.
Dissertations / Theses on the topic "Fem-sf"
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LARBALESTIER, Justine. "THE BATTLE OF THE SEXES IN SCIENCE FICTION: FROM THE PULPS TO THE JAMES TIPTREE, JR. MEMORIAL AWARD." University of Sydney, English, 1996. http://hdl.handle.net/2123/401.
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In this thesis I argue that science fiction is not a genre exclusively made up of written texts but a community or series of communities. I examine the science fiction community's engagement with questions of femeninity, masculinity, sex and sexuality over the past seventy years, that is from 1926 until 1996. My examination of this engagement is centred on the battle of the sexes, the lives of James Tiptree, Jr. and the Award named in Tiptree's honour. I make connections between contemporary feminist science fiction and the earliest pulp science fiction engagements with sex and sexuality.