Spider dragline silk is of great interest to people for its outstanding mechanical properties including high toughness. Biomimetic spinning spider has attracted people's attention decades. This paper reports a simple and cheap method greatly toughen artificial by compositing with nanoanatase. The toughness the (breaking energy 93.1 ± 27.1 MJ m−3) exceeded that silkworm silks. hydrophilic nanomineral TiO2 large specific surface area interacted severely fibroin matrix through coordination...

In order to prepare a carbon-fiber-reinforced polymer composite (CFRP) with ideal microstructure and properties, new vacuum pressure infiltration CFRP method is proposed based on an analysis of existing preparation process methods. Research material systems was carried out by using this principle. The system mainly includes fiber pre-forming module, heating hot-press curing molding data acquisition control module. Under the conditions natural at 0 MPa + 6 h 25 ℃, -0.05 30 min 80 0.7 5 50...

Abstract Titanium alloys fabricated by selective laser melting (SLM) are typically subjected to post-treatments, such as shot peening, improve the mechanical properties. However, same Almen intensity may correspond various combinations of peening parameters, which will generate different microstructures and comprehensive Herein, SLMed Ti64 alloy was treated pneumatic (SP) ultrasonic (USP) under 0.2 mmA, investigating changes microstructure corrosion resistance. The average surface roughness...

Abstract 4D printing of continuous fiber‐reinforced shape memory polymer (SMP) composites is a promising technology that has emerged in recent years. Nonetheless, combining superior load‐bearing capacity with fast‐response reconstruction intelligently‐driven structures still challenge due to the inferior thermal conductivity and mechanical properties along transverse thickness directions fibers. In this study, multi‐scale strategy for 3D carbon medium‐reinforced thermosetting SMP (Ts‐SMP)...

Robots are finding increasing application in aircraft composite structure assembly due to their flexibility and the growing demand of manufacturers for high production rates. The contact force frame a robotic fuselage panel can hardly be controlled multi-surface variable stiffness caused by compliance complex shape with multiple mating surfaces. paper proposes system compliant control strategy using Gaussian process surrogate model. First, is introduced, global coordinate transformation...

Crop straw return after harvest is considered an important way to achieve both agronomic and environmental benefits. However, the appropriate amount of substitute for fertilizer remains unclear. A field experiment was performed from 2016-2018 explore effect different amounts on soil properties, organic carbon (SOC) storage, grain yield, yield components, nitrogen (N) use efficiency, phosphorus (P) N surplus, P surplus rice harvesting. Relative mineral fertilization alone, substitution at 5 t...

Unmanned Aerial Vehicles (UAVs) are increasingly pivotal in operations such as flood rescue, wildfire surveillance, and covert military endeavors, with their integration into the Internet of Things (IoT) networks broadening scope services they provide. Amidst this expansion, security concerns for UAVs have come to forefront, particularly open communication environments where face authentication challenges risks sensitive data, including location information, being exposed unauthorized...

The gray leaf spot caused by Cercospora zeina has become a serious disease in maize China. isolates of C. from Yunnan, Sichuan, Guizhou, Hubei, Chongqing, Gansu, and Shaanxi Provinces were collected. From those, 127 samples used for genetic diversity analysis based on inter-simple sequence repeat (ISSR) 108 multi-gene five-gene fragments. results indicated that populations are differentiated with relatively high level classified into two major groups seven subgroups. intra-population...

The sensitivity of key structural parameters to the hydraulic response characteristics in an electronic fuel injector is investigated. First, characteristic defined detail (the opening/closing delay and time). Second, influencing are derived. Finally, importance effects on examined, by using design experiments method range analysis. Results show that inlet passage diameter primary factor opening closing delay, while control piston has dominant effect time time. A small a prefer little...

The service life of components can be extended by repairing fatigue crack with laser so as to improve resource utilization rate. However, the effect repair may influenced instability treatment. To investigate addition nanocomposites on effect, test under uniaxial tension was carried out evaluate precracked 304 stainless steel repaired laser. According results obtained from tests, a probabilistic distribution model considered sampling size and discreteness data established based...

Carbon fiber reinforced shape memory polymer composite (SMPC) is a kind of smart material with characteristics, which widely used in aerospace, biomedicine, robotics and other fields. In this paper, SMPC was prepared by heating molding process at five different temperatures. The effect temperature on the performance studied. results show that properties are closely related to infiltration during preparation process. When 70 °C, has an optimum penetration defects effectively controlled....

Automatic Dependent Surveillance Broadcast (ADS-B) is an important means of communication and surveillance between aircrafts, aircraft ground. At present, the 1090ES UAT modes used in China are incompatible with each other unmanned aerial vehicle (UAV) has many adverse effects on flight safety. Considering about low cost, security integration, this paper, spectrum sensing algorithms for different signals applied improved. Combined UAV signal detection, a serial segmentation multi-mode ADS-B...

2D-T700/E44 composites are prepared by natural curing process, heating process and improved compression moulding (ICM) severally. Test shows the bending strengths of three processes 260, 390 605 MPa respectively. By observing microstructure, composite has many infiltration voids cracks in fracture, so strength is low. The also a small number fracture. However, defects less than former. This due to high-temperature environment enhances fluidity resin during period curing. When ICM used,...

Traditional powder metallurgy was employed to prepare alumina–zirconia (Al2O3–ZrO2) and alumina–zirconia–aluminium (Al2O3–ZrO2–Al) ceramics. It found that as the sintering temperature increases, flexural strength of both ceramics increases first then decreases. The maximum Al2O3–ZrO2 appears be 430.7 MPa when sintered at 1650°C, Al2O3–ZrO2–Al 448.8 1600°C. As grain size each phase grows up, porosity content intragranular monoclinic ZrO2 (m-ZrO2) increases. addition Al improves dispersion...

Carbon-fiber-reinforced polymer (CFRP) composites have received extensive attention in aerospace, weapon equipment, communication electronics, transportation and other fields. The improved compression-molding process is one of the most advantageous processes for preparing CFRP composites. It important to understand effects molding parameters, particular temperature on preparation an ideal composite. This paper addresses effect no-pressure curing two-dimensional woven (2D-CFRP) bending...