New Kind Of Structure Research Articles

Anthropology at the Ends of the Lines

Anthropology at the Ends of the Lines

“Enacting Some Kind of New Structure”The Potential for Collaboration During Disaster Response and Recovery to Transform and Improve Adaptive Capacity

“Enacting Some Kind of New Structure”The Potential for Collaboration During Disaster Response and Recovery to Transform and Improve Adaptive Capacity

The influences of the number of concrete dowels to shear resistance based on push out tests

To reduce the depth of floor-beam structures and to save the cost of headed-shear studs, many types of shallow composite beam have been developed during the last few years. Among them, the shallow-hollow steel beam consists of web openings, infilled with in-situ concrete (named concrete dowel) has been increasingly focused recently. In this new kind of structure, this concrete dowel plays an important role as the principal shear connector. This article presents an investigation on the shear transferring mechanism and failure behavior of the trapezoid shape concrete dowel. An experimental campaign of static push-out tests has been conducted with variability in the number of web openings (WOs). The results indicate that the mechanical behavior of concrete dowel could be divided into crushing, compression, and tension zones and exhibits brittle behavior. The longitudinal shear resistance and specimen's stiffness are strongly affected by the number of considered WOs

Seismic Behavior Experimental Study on the Joint of Circular Tubed Steel-Reinforced Concrete Columns

A new type joint of Circular Tubed Steel-Reinforced Concrete (CTSRC) columns was designed in this paper. The structural characteristics, manufacturing process, and mechanical properties of raw materials of the new joint were introduced. In order to simulate the earthquake action, two joint specimens were subjected to low-cycle cyclic loading at the end of the column. Based on the in-depth study of the failure characteristics, load-displacement hysteretic curve, skeleton curve, ductility index, load-strain hysteretic curve in the core area of the joint, energy dissipation performance, strength and stiffness degradation performance, and shear deformation in the core area of the joint during the whole loading process, the seismic behavior of this new type of joint was investigated. The results show that the new joint has reasonable failure characteristics, high bearing capacity, good ductility, excellent seismic energy dissipation performance, and strong resistance to strength and stiffness degradation, which meets the seismic design principle of “strong joint and weak component” and is suitable for the results with special requirements for seismic performance. In addition, preliminary design recommendations were put forward. The research results of this paper can provide a theoretical basis for the application of this kind of new structure.

Investigation of device-circuit for negative capacitance vertical nanowire FETs based on SPICE model

In this study, a SPICE model for a negative capacitance vertical nanowire field-effect-transistor (NC VNW-FET) based on BSIM-CMG model and the Landau–Khalatnikov equation was presented. Suffering from the limitation of short gate length there is a lack of controllable and integrative structures for high performance NC VNW-FETs. A new kind of structure was proposed for NC VNW-FETs at sub-3 nm node. Moreover, in order to understand and improve NC VNW-FETs, the S-shaped polarization-voltage curve was divided into four regions and some new design rules were proposed. By using the SPICE model, device-circuit co-optimization was implemented. The co-design of gate work function and NC was investigated. A ring oscillator was simulated to analyze the circuit energy-delay, and it showed that significant energy reduction, up to 88%, at iso-delay for NC VNW-FETs at low supply voltage can be achieved. This study gives a credible method to analyze the performance of NC based devices and circuits and reveals the potential of NC VNW-FETs in low-power applications.

A novel contact-enhanced low-g inertial switch with low-stiffness fixed electrode

A novel contact-enhanced low-g inertial switch with low-stiffness fixed electrode was designed, fabricated and tested for airbag restraint systems in this paper. Its sensitive direction is vertical of the switch. By adopting a novel low-stiffness arc structure as the fixed electrode and using Archimedean spiral beams to support center proof mass, the flexibility of the system increased and the contact duration extended. In order to restrict the radial displacement of the proof mass and keep it at the central zone of the switch, a circular limited post was installed at the center of the proof mass. The dynamic response of the switch was simulated and analyzed by ANSYS software. The simulation results indicate that the novel arc electrodes have low stiffness and the switch with this kind of new structure has long contact time. Six-layer photolithography and electroplating technology were used to fabricate the micro-switch and the overall dimension of the switch is 3850 μm × 3850 μm × 240 μm. Ultimately, the fabricated prototypes were tested by dropping hammer system. The contact times of the prototypes can be up to 260 μs under the acceleration with 26 g.

FUTURES OF GAMING: HOW CASINOS AND GAMBLING MIGHT EVOLVE IN THE NEAR FUTURE

FUTURES OF GAMING: HOW CASINOS AND GAMBLING MIGHT EVOLVE IN THE NEAR FUTURE

Self-Deployable Geometries for Space Applications

Variable-geometry structures are useful in aerospace applications because they are deployable, from a compact configuration (launch phase) to a spread geometry (operational phase). They may also benefit from the use of flexible joints, which store elastic energy for automatic deployment. Following the development of a self-deploying antenna frame structure with scissors, the geometrical configuration of a new kind of structure, simpler, lighter, and minimizing mechanical joints between elements, is proposed in this article. This topology can form a three-dimensional structure when partially opened or a planar structure when fully deployed. The applications concern autotensioning structures such as meshed space antenna, deorbiting sails, and also solar panel support structures.

Dynamic Modeling and Ground Test of Tethered-net

Flexible tethered-net, a new kind of structure for advanced concepts in space exploration, has special potential application such as capturing space debris and building huge antenna. A critical issue in the design and analysis of space net system is deployment of modelling technology. The dynamics behaviour of flexible net systems is investigated based on finite segment approach in this paper. The flexible net is modelled as a series of collected semi-damp springs with masses lumped at appropriated nodes. Besides, a comprehensive study on a model for the tethered-net based on absolute nodal coordinates formulation (ANCF) is provided. Simulations show that the results based on the ANCF modelling method present a good agreement with that based on the conventional semi–spring damper modelling method. Then the flexible multibody dynamics models has been verified by comparison with ground experiment.

Manufacturing and quasi-static bending behavior of wood-based sandwich structures

The quasi-static behavior of innovative wood based sandwich structures with plywood core and skins made either of aluminum or of fiber reinforced polymer (carbon, glass or flax composite skins) was investigated. The wood based sandwich structures were subjected to three point static bending tests to determine their strength and failure mechanisms. Two different manufacturing processes, namely vacuum bag molding and thermo-compression, were used to manufacture the structures. The influence of some aspects of the different manufacturing processes on the flexural behavior of wood based sandwich structures are discussed. It is shown that manufacturing processes influence strongly the static responses. Failure modes and strengths are investigated during quasi-static bending tests. Bending tests showed that the mechanical characteristics were very high compared to those of a reference sandwich that is currently used for civil aircraft floors. This new kind of structure is environmentally friendly and very cheap, and seems promising for the transportation industry in general.

Vector vortex beam generation with dolphin-shaped cell meta-surface.

We present a dolphin-shaped cell meta-surface, which is a combination of dolphin-shaped metallic cells and dielectric substrate, for vector vortex beam generation with the illumination of linearly polarized light. Surface plasmon polaritons are excited at the boundary of the metallic cells, then guided by the metallic structures, and finally squeezed to the tips to form highly localized strong electromagnetic fields, which generate the intensity of vector vortex beams at z component. Synchronously, the abrupt phase change produced by the meta-surface is utilized to explain the vortex phase generated by elements. The new kind of structure can be utilized for communication, bioscience, and materiality.

Active target MAIKo to investigate cluster structures in unstable nuclei

Study on clustering of nucleons in nuclei is recently focusing on unstable nuclei where new kinds of structures, namely molecular structures with excess nucleons, are predicted. The Coulomb shift of energy in the mirror system is suggested to reflect the size of these structures. Although the missing mass spectroscopy is expected to give access to these structures even beyond particle decay thresholds without any biases in excitation energy spectra but the detection of very low energy particles is challenging. To satisfy the requirement, a new active target system MAIKo has been developed at RCNP. The detector was commissioned using a 13C beam under the same kinematical condition as that of RI beam experiments.

Mechanism of capacity fading caused by Mn (II) deposition on anodes for spinel lithium manganese oxide cell

The capacity fade of spinel lithium manganese oxide in lithium-ion batteries is a bottleneck challenge for the large-scale application. The traditional opinion is that Mn(II) ions in the anode are reduced to the metallic manganese that helps for catalyzing electrolyte decomposition. This could poison and damage the solid electrolyte interface (SEI) film, leading to the the capacity fade in Li-ion batteries. We propose a new mechanism that Mn(II) deposites at the anode hinders and/or blocks the intercalation/de-intercalation of lithium ions,which leads to the capacity fade in Li-ion batteries. Based on the new mechanism assumption, a kind of new structure with core-shell characteristic is designed to inhabit manganese ion dissolution, thus improving electrochemical cycle performance of the cell. By the way, this mechanism hypothesis is also supported by the results of these experiments. The LiMn2-xTixO4 shell layer enhances cathode resistance to corrosion attack and effectively suppresses dissolution of Mn, then improves battery cycle performance with LiMn2O4 cathode, even at high rate and elevated temperature.

Recent Patents on Automobile Brake Tester

With the advancement of safety awareness, the automobile brake tester is widely applied to automobile brake performance testing. The brake tester is composed of four major subsystems: one or more energy supply devices, electric motors, transmission assemblies and a control device. This paper reviews various patents of the automobile brake tester which employs the different devices and structures to obtain new functions in recent years. Compared with the new structures, the traditional brake tester is not versatile, compact and modular. Moreover, it is hard to fix the vehicle on the brake tester. Thus, several kinds of new structures of brake testers have been designed to solve these problems, including the limited function and the complex structure. The new types of brake testers are more compact, simple and versatile. The vehicle can be easily fixed on the brake tester as well. Furthermore, the cost of the brake tester will be reduced by importing the new structures and devices. Keywords: Automobile, brake performance testing, brake tester, new functions, new structures, safety awareness.

Low resistance bakelite RPC study for high rate working capability

This paper presentsseries efforts to lower resistance of bakelite electrode plate to improve the RPC capability under high rate working condition. New bakelite material with alkali metallic ion doping has been manufactured and tested. This bakelite is found unstable under large charge flux and need further investigation. Alternatively, a new structure of carbon-embedded bakelite RPC has been developed, which can reduce the effective resistance of electrode by a factor of 10. The prototype of the carbon-embedded chamber could function well under gamma radiation source at event rate higher than 10 kHz/cm2. The preliminary tests show that this kind of new structure performs as efficiently as traditional RPCs.

Elastic Modulus of Star-Shaped Honeycomb Structure with Negative Poisson's Ratio

Negative Poisson's ratio honeycomb structure has unique mechanical properties. It has very good prospects for development. A mechanical model of star-shaped honeycomb structure is proposed and the mechanical properties of the model are derived. It can provide theoretical reference for engineering design of this kind of new structure.

Study on Seismic Behavior of Self-Centering Precast Frame

Self-Centering structure is a kind of new structure, which aims for reducing the residual deformation of structure after the earthquake. In order to research the Seismic Behavior of Self-centering Prefabricated concrete frame, a new joint applied with prestressed tendons and a traditional joint are designed in this paper with the finite element software ABAQUS. The seismic performances of them are contrastively analyzed. The new joint is found to have better self-centering capacity. Then two plane frame models are analyzed. The result shows that the frame applied with prestressed tendons has some capacity of self-centering and enough energy dissipation effects.

Experimental study on mechanical performances of lattice steel reinforced concrete inner frame with irregular section columns

Based on the test on a 1/2.5-scaled model of a two-bay and three-story inner frame composed of reinforced concrete beams and lattice steel reinforced concrete (SRC) irregular section columns under low cyclic reversed loading, the failure process and the features of the frame were observed. The subsequence of plastic hinges of the structure, the load-displacement hysteresis loops and the skeleton curve, load bearing capacity, inter-story drift ratio, ductility, energy dissipation and stiffness degradation were analyzed. The results show that the lattice SRC inner frame is a typical strong column-weak beam structure. The hysteresis loops are spindle-shaped, and the stiffness degradation is insignificant. The elastic-plastic inter-story deformation capacity is high. Compared with the reinforced concrete frame with irregular section columns, the ductility and energy dissipation of the structure are better. The conclusions can be referred to for seismic design of this new kind of structure.

Snow Pressure on a Semiflexible Retaining Structure

AbstractSnow avalanche hazard is one of the most critical aspects in the urbanization of mountainous areas. The risk from these natural phenomena can be reduced if proper countermeasures for reducing the danger or preventing avalanche triggering are taken. For instance, in the avalanche initiation zone, devices able to withstand snowpack gliding and prevent crack propagation can be installed. These can be classified as rigid (snow bridges) or flexible (snow net) structures, depending on the mechanisms involved under snow loading. In recent years, a new kind of structure called a snow umbrella, based on a net panel supported by rigid beams, has been designed and installed in the northwestern Italian Alps. As the real behavior of these structures is far from being simple to understand because of the complex interaction with snowpack movements, an umbrella was instrumented and monitored during the winter season of 2010–2011. The recorded data are used for testing two possible pressure distributions and evalu...

Design of Wind-solar Complementary Power System Based on Progressive Fuzzy Control

In order to make a wind-solar complementary power system be a self-intervention controller, a new fuzzy control approach to hybrid power generation in wind and solar co-generation system is developed in this paper. Firstly, a new kind of structure of wind-solar complementary power system is designed. The method of double-fed brushless wind turbine sets is adopted, based on the principle of nonlinear control theory, according to the external excitation caused by the nonlinear changes of wind forces and wind speeds, for the purpose of capturing the wind power in the greatest degree. Meanwhile, the idea of extensional adaptive control on solar cells is adopted, also in order to transform the renewable energy to electrical power to the most degree. Secondly, according to the analysis on the characteristics of the multi-input and multi-output of the distributed wind-solar complementary power system, a progressive fuzzy control algorithm based on fuzzy control method and adaptive control theory is put forward to control the loading and unloading process congruously among the wind turbines, the solar cells and the grid. Finally, the simulation study is carried out. It is shown that the new kind of wind-solar complementary power system can achieve the balance quite well between the supply and the demand of the electrical energy automatically according to the load of system, under the premise of improving the utilization rate of renewable resources as much as possible.