Compression ratio
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This paper presents an innovative asymptotic formula for calculating the additional damping in stay cables equipped with Negative Stiffness High Damping Rubber dampers (NS-HDR). The NS-HDR damper incorporates negative stiffness through a pre-compressed spring.
15p vithomson 02-07-2024 0 0 Download
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In the present study, from recent experimental results of asymmetrical loading tests on SFRC beams without stirrups, three NLFE models have been validated and further developed to evaluate the impact that the ratio of shear span-to-depth (a/d) and the compressive strength of steel fiber concrete (SFC) have on the shear behavior and shear strength of SFRC beams without stirrups.
15p viohoyo 25-04-2024 2 2 Download
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This paper presents the experimental findings on the influence of curing duration on the compressive strength of self-compacting concrete (SCC) with a high proportion of fly ash. The SCC mixtures examined had fly ash content ratios of 0%, 50%, and 60% by volume of powder.
3p vijaychest 24-04-2024 6 2 Download
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Part 2 book "Internal combustion engines improving performance, fuel economy and emissions" includes content: Design of an electromagnetic variable valve train with a magnetorheological buffer, comparison of the emissions, noise, and fuel consumption comparison of direct and indirect piezoelectric and solenoid injectors in a low compression ratio diesel engine, comparative analysis of the combustion stability of diesel methanol and diesel ethanol in a dual fuel enginem,... and other contents.
157p muasambanhan07 18-02-2024 4 2 Download
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This paper investigates the influence of intergranular friction and grain size distributions on the initial void ratio of a granular sample subjected to isotropic compression loading. In the field of geomechanics, besides the loading path and evolution of microscopic properties, the initial void ratio is a crucial and key factor that governs the mechanical behavior of geomaterials.
10p viberkshire 09-08-2023 7 3 Download
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An experimental study on compressive strength of mortar mixes containing different amounts of rice husk ash (5, 10, 20%) has been investigated. The impact of different elevated temperatures (150, 300, 450, 750o C) on mortar strength is also examined. The experiments found that RHA can be used in its untreated form up to 10% as cementitious replacement without detriment of mortar compressive strength. Furthermore, the addition of RHA improves the resistance of mortars at high temperatures excepting to the ones with replacement ratio of 20%.
9p nhanchienthien 25-07-2023 8 4 Download
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This paper presents a new technique to design RC columns of the rectangular section, subjected to axial compression and uni- or biaxial bending. Distributed bars around the perimeter are considered as an equivalent thin tube. Using the same steel area for two separate couples of axial compression and uniaxial bending is a trick to solve the equilibrium equations for the optimum steel ratio between faces b and h.
6p vifalcon 16-05-2023 4 4 Download
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This paper presents a simulation study on engine performance characteristics of a high compression ratio biogas engine for high efficiency and low emission. A small diesel-type engine with a power of 14 horse power (HP) was modelled for simulating analysis with help of AVL Boost (a thermodynamic analyzing tool).
8p vidoctorstrange 06-05-2023 6 2 Download
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Động cơ có thể thay đổi tỷ số nén linh hoạt - Variable compression ratio (VCR) là một trong những giải pháp giúp tăng công suất động cơ, giảm mức tiêu thụ nhiên liệu nhờ nâng cao hiệu suất quá trình cháy, giảm mức khí thải độc hại. Bài viết Nghiên cứu động cơ thay đổi tỉ số nén VCR giới thiệu động cơ VCR; Kết cấu và nguyên lý hoạt động của động cơ VCRi.
5p vizenvo 30-11-2022 22 3 Download
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This paper presents the possible combinations of advantage factors from PFI and GDI system by applying an airassisted injector on Semi-direct Injection System (SDI). Firstly, an adaptor that uses compressed air to improve the atomization of conventional injector and reduce droplet size is made. Secondly, the modifications of intake port by using vortex plate and the other by closing one intake valve increase swirl ratio of in-cylinder air motions which help to form rich mixture around spark plug and lean mixture at other locations.
5p vispyker 16-11-2022 11 2 Download
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This paper presents a study on the influence of squish area on engine performance of single cylinder natural gas converted engine. The obtained results indicated that the increase of compression ratio only augmented the risk of knocking for single cylinder natural gas converted engine.
8p viporsche 25-10-2022 10 4 Download
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Natural gas is well known as a promising alternative fuel for internal combustion engine. In this study, a numerical model was built based on the experimental CNG converted engine. Direct injection and port fuel injection method was operated in the model on the same conditions such as design parameter, engine speed, compression ratio.
8p viporsche 25-10-2022 7 3 Download
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The paper presents experimental results and structural analysis of reinforced concrete (RC) columns made of recycled aggregate concrete (RAC) and natural aggregate concrete (NAC) under concentric compressive load. The ratio of recycled aggregates in mixture (i.e, replacement ratio, r in %) was 0, 50, and 100% by mass, where r = 0% corresponding to NAC.
11p haoasakura 30-05-2022 9 1 Download
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The EIAs disclose that even through some of the mixes provide better performance in terms of certain environmental impact categories; especially CO2 emission, water pollution (fresh and marine) and ecotoxicity, their strength to environmental impact ratios are relatively low.
12p thebadguys 15-01-2022 8 0 Download
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The present research aims to investigate the influence of the ratio of reinforced concrete layer height to total height (h/H) on the mechanical properties of functionally graded concrete (FGC) containing fly ash (Fa) and polypropylene (PP) fiber. All FGC samples were prepared with a constant water-to-cementitious materials ratio of 0.36 and ordinary Portland cement was replaced with Fa at 20% by mass.
14p inception36 30-11-2021 9 3 Download
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This paper presents a numerical analysis of the seismic behavior of square concrete filled steel tubular (CFST) columns. Finite element analysis (FEA) models in ABAQUS software were used to simulate a series of columns subjected to axial compression and cyclic lateral loading. The CFST columns were simulated using nonlinear tri-dimensional (3-D) finite elements for the infilled concrete, and nonlinear two-dimensional (2-D) finite elements for the steel tube.
14p chauchaungayxua12 09-07-2021 24 2 Download
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In order to reduce the serious impacts of industrial and agricultural wastes on the environment, raw rice husk and bottom ash were used as fine aggregates, while fly ash was utilized as a binder material in the production of unburnt building bricks. Two group mixtures were designed with water-to-binder (W/B) ratios of 0.30 and 0.35. The rice husk was used to replace 0%, 3%, 6%, and 9% of bottom ash content by mass.
11p chauchaungayxua12 09-07-2021 10 2 Download
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In this paper, a numerical Discrete Element Method (DEM) model was calibrated to investigate the transmission of force in granular media. To this aim, DEM simulation was performed for reproducing the behavior of a given granular material under uniform compression. The DEM model was validated by comparing the obtained shear stress/normal stress ratio with results published in the available literature. The network of contact forces was then computed, showing the arrangement of the material microstructure under applied loading...
19p nguaconbaynhay11 07-04-2021 19 2 Download
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Current glenoid defect measurement techniques only quantify bone loss in terms of defect diameter or surface. However, the glenoid depth plays an important role in shoulder stabilization by means of concavity compression.
5p vioregon2711 22-02-2021 10 2 Download
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Vertebral augmentation is the first-line treatment for the osteoporosis vertebral compression fractures. Bone cement leakage is the most common complication of this surgery. This study aims to assess the risk factors for different types of cement leakage and provides a nomogram for predicting the cement intradiscal leakage.
8p vimariana2711 22-12-2020 8 0 Download