Tensegrity structures with detached struts are naturally suitable for deployable applications, both in terrestrial and outer-space structures, as well morphing devices. Composed of discontinuous continuous cables, such systems only structurally stable when self-stress is induced; otherwise, they lose the original geometrical configuration (while keeping topology) thus can be tightly packed. We exploit this feature by using stimulus responsive polymers to introduce a paradigm creating...

In recent years, there is an increased use of passive filters in both transmission and distribution systems due to the proliferation power electronic devices. However, problem filter design has not been well addressed past one example application high-pass a package. Three types HP are widely used mitigate multiple harmonics, i.e., 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> filter, 3...

For a current-fed dual-active-bridge bidirectional dc-dc converter, an extended duty cycle control is proposed. The low-voltage-side (LVS) bottom switch can operate lower than 50%. conduction loss of switches be reduced by using low-voltage-rating mosfets for the LVS. Meanwhile, voltage mismatching with adaptive clamp regulation proposed to achieve zero-voltage switching all throughout full load range. Besides, LVS dc inductors, magnetic-integrated technique used reduce core loss, and power...

A current-fed dual active bridge dc-dc converter using transformers is proposed for the energy storage system and electric vehicles, which suitable to be used in wide input output voltage range bidirectional power flow applications. Optimized switching pattern coupling relationship among all controlled variables have been explored order minimize leakage inductor current peak rms value spite of load conversion gain variation, can reduce stress switches conduction loss. Furthermore, ZVS...

Super hybrid rice has significantly enhanced agricultural productivity in China, yet its environmental sustainability implications remain poorly understood. Using the food-carbon-nitrogen-energy-profit (FCNEP) framework, we evaluated five elite varieties (LYPJ, YLY1, YLY2, YLY900, XYL900) cultivated between 1999 and 2017. Field experiments were conducted from 2015 to 2017 across four provinces (Hubei, Hunan, Henan, Jiangxi Province) central China under nitrogen treatments (0, 210, 300, 390...

According to the quantitative forecast of investment changes loan in electric power industry, we put forward a kind model that based on GA-BP neural network. sliding window method, use each industry structure form part linear correlation continuous time sequence, it as data sample additional episodes network, and then eventually get prediction model. Finally, through bank nearly 20 years fund experiments show forecasting is effective, experimental results GA-the BP network adopted overcome...

SUMMARY Cable is the most important bearing structure of cable-stayed bridges. Its safety has been crucial public concern. Traditional manual cable inspection method many defects such as low efficiency, poor reliability and hazardous working environment. In this paper, a new wirelessly controlled cable-climbing robot enabling safe convenient stay cables proposed. The designed composed two modules, joined by four turnbuckles to form closed that clasps cable. ground-based station, DC power...

Measurement while drilling (MWD) plays an important role in controlling well trajectory, improving efficiency and saving cost. In recent years, a large number of high-temperature wells have appeared, which makes the traditional MWD instruments no longer applicable. So far, active cooling method has been successfully applied to for oil gas wells. This paper presents new air by utilizing throttling gas, system is designed. An axisymmetric numerical model internal fluid established, different...

A solar powered battery charger is presented, where a photovoltaic (PV) panel used to convert power into electricity and DC/DC converter control the output of PV charging current for battery. In software, an optimal algorithm applied obtain maximum available from sunshine. The simulation experimental results are presented compared. applications this technique can be light electrical vehicles such as golf carts, scooters, airport utility vehicles, well other renewable stations batteries...

Researchers face difficulties in studying the effects of driveline efficiency on car fuel economy via bench and road tests because long working periods, high costs, heavy workloads. To simplify study process shorten test cycles, a simulation forecast method for combining computer forecasting with is proposed. Taking continuously variable transmission (CVT) as research object, model based constructed. An optimal economic variogram original CVT variogram, boundary conditions vehicle...

Abstract We analyze the folding kinematics of a recently proposed origami-based tessellated structure called Morph pattern, using thin, rigid panel assumptions. discuss geometry unit cell that can exist in two characteristic modes differing mountain/valley assignment degree-four vertex and explain how single tessellation undergo morphing through origami resulting multiple hybrid states. describe pattern branches, each path leading to different sets study local global Poisson’s ratios derive...

Recognizing various driving conditions in real time and adjusting control strategy accordingly automatic transmission vehicles are important to improve their adaptability the external environment. This study defines a generalized load concept which can comprehensively reflect condition information. The principle of gearshift based on is deduced theoretically, adopting linear interpolation between shift lines flat largest gradient road recognition results. For convenience application,...

The thermal protection technology for high-temperature environment has made great progress in recent years. Restricted by the harsh of oil drilling, design and development measurement-while-drilling instrument (MWD) wells are still a worldwide issue. Although quite few scholars have proposed variety schemes, feasibility or practical using effect not been fully verified. Through comparative analysis various cooling methods, it is considered that active scheme based on split-Stirling...

A current-fed DC-DC converter is proposed for the fuel cells, which suitable wide voltage conversion gain application. With control strategy, ZVS range can be achieved. Furthermore, there no input current ripple in this way, beneficial cells. The typical working mode of given. conditions every switch are discussed detail paper. parameters design basing on condition also demonstrated. effectiveness method verified by simulation and experimental results an 800W prototype.

Abstract To ensure no cavitation and water column separation in pump-turbines, the suction heights of pump-turbines high-head pumped-storage hydropower stations have to be decreased about –100 m, which leads high pressure draft-tube. During pump-trip transient process positive hammer wave draft-tube superposing initial may cause an imbalance rotating parts even a lifting-up accident. quantify runner forces, two typical processes, with without guide-vane closure after simultaneous power-off...

In this paper, orthogonal test design method and the CFD were used to study different building envelopes, outdoor environment of natural ventilation effect single span high temperature industrial workshop. Firstly, 18 models workshop with heat source constructed design. Secondly, simulated method. Finally, order influencing factors on was obtained through multiple index range analysis experiment results according average inside Then optimal combination best selected. The research can provide...