scholarly journals Combination of Concave and Convex Paraboloids: Theoretical Model of New-type Daylighting System

2021 ◽  
Author(s):  
Yusuke Tsuji ◽  
Hirotaka Suzuki
Keyword(s):  
Theoretical Model ◽  
New Type

Theoretical Model and Mechanical Performance of Semi-Integral Abutment Jointless Bridge

2013 ◽  
Vol 361-363 ◽  
pp. 1166-1169
Author(s):  
Tian Li Wang ◽  
Qing Ning Li ◽  
Da Lin Hu
Keyword(s):  
Theoretical Model ◽  
Prestressed Concrete ◽  
Mechanical Performance ◽  
Bridge Engineering ◽  
Expansion Joint ◽  
Integral Abutment ◽  
Weak Part ◽  
New Type ◽  
Jointless Bridge

Expansion joint of a bridge is a weak part of structure, it leads to early structure destroy and reduces the bridge life. The paper put forward a new type of Jointless Bridge --- Semi–Integral Abutment Jointless Bridge, and its theoretical model was built. An engineering of four spans 100m length Prestressed Concrete Semi–Integral Abutment Jointless Bridge was analyzed, and results that its mechanical performance is so excellent that it should be wide applied in bridge engineering.

scholarly journals Development and Investigation of Fully Ventilated Deep Subwavelength Absorbers

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1835
Author(s):  
Heng Wang ◽  
Qibo Mao
Keyword(s):  
Theoretical Model ◽  
Sound Absorption ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Acoustic Metamaterial ◽  
Acoustic Performance ◽  
Half Wave ◽  
Quarter Wave ◽  
New Type ◽  
Good Agreement

A new type of deep subwavelength acoustic metamaterial (AMM) absorber with 100% ventilation is presented in this study. The proposed ventilation absorber consists of coiled-up half-wave resonators (HWRs) and quarter-wave resonators (QWRs). First, the sound absorption and sound transmission performances for absorbers were analyzed considering the thermal viscosity dissipation. Then, the prototype with ten HWRs and three QWRs composed of acrylic plates was manufactured based on the theoretical model. The acoustic performance of the absorber was tested in an air-filled acoustic impedance tube to determine the sound absorption and transmission loss performances. Good agreement was found between the measured and theoretically predicted results. The experimental results show that the proposed ventilation AMM absorber is able to achieve sound absorption in a range between 330 Hz and 460 Hz with a thickness of only 32 mm (about 3% of the wavelength in the air). Furthermore, the sound transmission loss can achieve 17 dB from 330 Hz to 460 Hz. The main advantage of the proposed absorber is that it can be completely ventilated in duct noise control.

scholarly journals THEORETICAL MODEL AND DESIGN OF A NOVEL STATIC POLARIZATION WIND IMAGING INTERFEROMETER (NSPWII)

2020 ◽  
Vol V-1-2020 ◽  
pp. 383-388
Author(s):  
C. Zhang ◽  
T. Yan ◽  
T. Mu ◽  
Y. He
Keyword(s):  
Theoretical Model ◽  
Wind Field ◽  
Michelson Interferometer ◽  
Atmospheric Temperature ◽  
Imaging Interferometer ◽  
New Type ◽  
Field Velocity ◽  
Static Polarization ◽  
Pass Through ◽  
Light Beams

Abstract. Polarization array based polarization Michelson wind field detection interferometer is a new type of interferometer for detecting atmospheric temperature and wind field velocity. We proposed a theoretical model and design of the novel static polarization wind imaging interferometer (NSPWII). It consists of a group of polarizers and waveplates, a polarization beamsplitter, a field widened Michelson interferometer, a pyramid prism, and a polarization array. Based on the principle of polarization interference, a polarization array composed of four polarizers with 45° polarization directions differences is directly in front of the detector, and four modulated light beams from the pyramid prism pass through the four polarizers. Then, interferograms with four different intensity are imaged on the detector simultaneously, which further provides the atmospheric temperature and wind field velocity. The advantages of this instrument are static (no moving parts), achromatic, and temperature compensated. It is capable of measuring the upper atmospheric wind field in real time with a high precision.

Prestress Analysis of Flat Steel Ribbon-Wound Vessel

1993 ◽  
Vol 115 (2) ◽  
pp. 171-176 ◽  
Author(s):  
P. S. Huang ◽  
G. B. Zhu ◽  
R. Barron
Keyword(s):  
Theoretical Model ◽  
Pressure Vessel ◽  
Inner Core ◽  
Full Scale ◽  
Experimental Results ◽  
New Type ◽  
Flat Steel ◽  
Thin Walled ◽  
Steel Ribbon

The flat steel ribbon-wound vessel is a relatively new type of wound pressure vessel. This type of vessel consists of a thin-walled inner core and helically wound flat steel ribbons. The outstanding safety in service of this type of vessel is due, in part, to the large circumferential and axial prestresses introduced during the ribbon-winding process. This paper presents a model for determination of prestresses in such a vessel. The model considers the fabrication procedures producing the prestress in the vessel. Experimental results from tests using full-scale vessels are presented. Agreement between the theoretical model and the experimental results is excellent.

Factors Affecting Customer Intentions Toward AI-Made Music

2022 ◽  
pp. 195-220
Author(s):  
Bình Nghiêm-Phú
Keyword(s):  
Theoretical Model ◽  
Personal Characteristics ◽  
Factors Affecting ◽  
Practical Support ◽  
Product Service ◽  
New Type ◽  
Using Data ◽  
The One ◽  
Customer Attitudes ◽  
Young Customer

The purpose of this chapter was to develop and verify a theoretical model to understand the ways that potential customers perceive and act toward AI-made products. The author began the chapter with a review of the existing literature to extract the most fundamental elements, both internal and external to the customers, which can affect their perceptions and behaviours. From there, the author proposed and tested a theoretical model that can explain customer attitudes toward a new type of music: AI-made music. Using data gathered from a young customer sample (n = 219) in Japan, the author found that perceived product/service attributes and customers' personal characteristics had significant impacts on customer purchase intentions, while perceived seller attributes and environment characteristics had not. These findings helped expand the literature on customer attitudes by introducing and investigating an aggregated model on the one hand. They also provided practical support for the commercialization of the AI-made products industry in the future on the other.

High Stiffness Bearing

1979 ◽  
Vol 101 (4) ◽  
pp. 520-525 ◽  
Author(s):  
Lech Brzeski ◽  
Zbyszko Kazimierski
Keyword(s):  
Experimental Investigation ◽  
Theoretical Model ◽  
General Principle ◽  
Journal Bearing ◽  
Stable Operation ◽  
High Stiffness ◽  
Bearing Load ◽  
New Type ◽  
Gas Journal Bearing ◽  
Very High

A new type of high stiffness gas or liquid lubricated bearing is presented. The general principle and bearing configuration are explained. The theoretical model of the bearing is given for a case of gas journal bearing. Load versus displacement data were determined both theoretically and experimentally. The results obtained confirmed the very high stiffness of the bearing. The experimental investigation of the bearing demonstrated its stable operation.

scholarly journals Fundamentals of methodology and technology of designing individual educational results of students in the system of additional education of children

2020 ◽  
Author(s):  
Vladlen K Ignatovich ◽  
◽  
Petr B. Bondarev ◽  
Svetlana S. Ignatovich ◽  
Valentina E. Kurochkina ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Educational Outcomes ◽  
The State ◽  
Scientific Study ◽  
Educational Activity ◽  
Teachers And Students ◽  
New Type ◽  
The Subject ◽  
Outcomes For Children ◽  
Additional Education

The monograph presents the results of a scientific study devoted to the problem of theoretical, methodological and technological justification of the conditions for the formation of the subject of building an individual educational trajectory. The purpose of the study was to develop and justify a model for designing individual educational outcomes for children of different ages in the system of additional education as a new type of educational activity carried out in the subject-subject interaction of teachers and students. The results of the analysis of the state of the problem under study in the science and practice of education are presented. The concept of individual educational result is substantiated, the ways of their formation in ontogenesis are characterized. The theoretical model of designing individual educational results in the process of additional education is developed and described, the characteristics of the subjectivity of teachers and students and the possibilities of their purposeful formation are given. The pedagogical conditions that ensure the effectiveness of this activity are characterized. Methodological recommendations on the organization of free social tests of students as subjects of designing their own educational results are given. The components of the technology of designing and monitoring individual educational results of students in the process of additional education are described.

Flexural Characteristics of Concrete Beams Reinforced with a New Type of GFRP Bar

2009 ◽  
Vol 17 (4) ◽  
pp. 253-264 ◽  
Author(s):  
Hongseob Oh ◽  
Do Young Moon ◽  
Goangseup Zi
Keyword(s):  
Theoretical Model ◽  
American Concrete Institute ◽  
Concrete Cover ◽  
Flexural Capacity ◽  
Concrete Members ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
New Type

Beam tests were conducted to investigate the characteristics of a newly developed type of glass fibre-reinforced polymer (GFRP) rebar as reinforcement in flexural concrete members. Nine beams over-reinforced with different types of rebar, and with varying reinforcement ratios and depths of concrete cover, were monotonically loaded up to failure. Results were characterised by failure mode, moment–curvature, flexural capacity, load–deflection, and crack width. The test results were compared with the theoretical model and the American Concrete Institute design guide, which showed that the performance of the newly- developed GFRP rebar was comparable to commercially available GFRP rebars. In addition, a theoretical model for moment–curvature and an equation for predicting the flexural capacity of the beams with multiple layers of GFRP rebar are presented, based on the experimental observations.

scholarly journals Warp-Knitted Spacer Fabric Reinforced Syntactic Foam: A Compression Modulus Meso-Mechanics Theoretical Model and Experimental Verification

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 286 ◽  
Author(s):  
Chao Zhi ◽  
Mingjuan Du ◽  
Zhaoling Sun ◽  
Mengjie Wu ◽  
Xiaoyi He ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Theoretical Model ◽  
Volume Fraction ◽  
Syntactic Foam ◽  
Compression Modulus ◽  
Static Compression ◽  
Model Compression ◽  
Equivalent Inclusion Method ◽  
Spacer Fabric ◽  
New Type

In this study, a new type ternary composite, called warp-knitted spacer fabric reinforced syntactic foam (WKSF-SF), with the advantages of high mechanical properties and a lower density, was proposed. Then, a meso-mechanics theoretical model based on the Eshelby–Mori–Tanaka equivalent inclusion method, average stress method and composite hybrid theory was established to predict the compression modulus of WKSF-SF. In order to verify the validity of this model, compression modulus values of theoretical simulations were compared with the quasi-static compression experiment results. The results showed that the addition of suitable WKSF produces at least 15% improvement in the compressive modulus of WKSF-SF compared with neat syntactic foam (NSF). Meanwhile, the theoretical model can effectively simulate the values and variation tendency of the compression modulus for different WKSF-SF samples, and is especially suitable for the samples with smaller wall thickness or a moderate volume fraction of microballoons (the deviations is less than 5%). The study of the meso-mechanical properties of WKSF-SF will help to increase understanding of the compression properties of this new type composite deeply. It is expected that WKSF-SF can be used in aerospace, marine, transportation, construction, and other fields.

Sign in / Sign up

Export Citation Format

Share Document