To help understand the deformational history of northeastern Tibetan Plateau, paleomagnetic samples were collected from 177 sites and two magnetostratigraphic sections at 16 localities distributed among Upper Jurassic‐Lower Cretaceous to Pliocene sedimentary subordinate volcanic rocks within Xining‐Lanzhou region (34–37°N, 101–105°E). A total 127 12 yielded primary magnetizations confirmed by fold, reversal, conglomerate tests. Age control on is provided regional synthesis...

Accurate stratigraphic ages are crucial to understanding the deformation history of Tibetan Plateau prior and during Indo‐Asian collision. Efforts quantify Mesozoic‐Cenozoic hindered by limited fossils a paucity volcanic horizons regionally correlative strata. Magnetostratigraphic biostratigraphic results from Xining‐Minhe‐Longzhong basin complex Dangchang provide an improved chronology nonmarine development over large region northeastern (34–37°N, 101–105°E). Analyses 171...

Comprehensive Summary Excited‐state intramolecular proton transfer (ESIPT) involves photochemical tautomerization between two excited states (E* and K*) via transfer. Developing polymer photochromism based on the of organic ESIPT molecules has been rarely reported. We report molecule HBT‐2OH exhibits concentration‐dependent photochromic behavior in a polyurethane (PU) network. At low concentrations, primarily exists trans ‐enol configuration without OH···N hydrogen bonds PU, emitting blue...

Metal/polymer reactive materials have been studied and applied in a wide range of ways recent years. This type material is insensitive under normal conditions but reacts violently releases large amount chemical energy high-speed impact or high strain rate loading conditions. Compared with conventional explosives, it has better mechanical properties, its unit mass several times that TNT. In this paper, PTFE/Al/CuO are the main research objects, we assess release abilities through experimental...

Metal/fluoropolymer materials are typical reactive materials. Polytetrafluoroethylene (PTFE)/Al/CuO were studied in this research. Scanning electron microscopy (SEM), quasi-static compression, the Split Hopkinson pressure bar test, and drop hammer test used to study mechanical properties induced reaction characteristics of with different Al/CuO thermite contents particle sizes. SEM images samples demonstrate that mixed evenly. The compression results show that, if size PTFE was too small,...

Artificial spin ices are periodic arrangements of interacting nanomagnets successfully used to investigate emergent phenomena in the presence geometric frustration. Recently, it has been shown that artificial can be as building blocks for creating functional materials, such magnonic crystals, and support a large number programmable magnetic states. We magnetization dynamics system exhibiting anisotropic magnetostatic interactions owing locally broken structural inversion symmetry. find rich...

Currently, PTFE/Al is widely used in the reactive fragmentation warhead. However, for same explosive yield, fragments usually have a smaller damage-radius than inert because has poor penetration ability and needs an impact-speed up to 1000 m/s stimulate its chemical reaction. To enhance damage power of fragments, six kinds materials (PTFE/Al, PTFE/B, PTFE/Si, PTFE/Al/B, PTFE/Al/Si, PTFE/Al/CuO) based on PTFE were designed studied. Through drop weight system self-designed energy release test...

Antiferromagnetically coupled ferromagnetic thin films have recently attracted significant attention in magnonics because of the possibility to tune spin-wave dispersion by altering interlayer exchange coupling. To implement such magnonic devices, a detailed understanding precessional dynamics magnetization systems is required. Here, we present systematic characterization for with layer going from nearly antiparallel parallel alignment magnetic field. Experimentally, measured...

With the improvement of protection technology, damage power conventional penetrators has become increasingly inferior. Reactive material is a new type energetic material, which strong energy release capabilities under high-velocity-impact conditions. In this paper, reactive materials were put into penetrator, and its penetration characteristics studied. First, penetrator with enhanced lateral effect (PELE) projectile structure better capability was obtained by numerical simulation. Then,...

In order to more realistically reflect the penetrating and crushing process of a PELE (Penetration with Enhanced Lateral Efficiency) projectile, stochastic failure algorithm crack-softening were added corresponding material in this paper. According theoretical analysis two algorithms, parameters (stochastic constant γ, fracture energy Gf, tensile strength σT) determined. Then, four sets simulation conditions ((a) no crack softening, (b) failure, (c) softening (d) failure) designed...

Magnetic damping plays a crucial role in the dynamics of magnetic systems. Hence, control over is highly desirable for development devices. One possible ways to manipulate ferromagnetic material injection spin currents generated by Hall effect. The can be used moments as well effective material. In this paper, we demonstrate that influence current on sensitive relative direction polarization and precessional axis magnetization. observations are important various applications storage devices...

In order to improve the separation performance of nanofiltration (NF) membranes, numerous inorganic components have been introduced into polymer membranes.Molybdenum disulfide (MoS 2 ) is an emerging graphene-like nanomaterials, which has many advantages, and expected novel applications in NF fields.Herein, this work PDDA modified MoS nanosheets were prepared, showed better dispersion aqueous solution, PDDA@MoS displayed higher compatibility with polyelectrolyte.Then, prepared was...

The control of spin waves in periodic magnetic structures has facilitated the realization many functional magnonic devices, such as band stop filters and transistors, where geometry crystal structure plays an important role. Here, we report on magnetostatic mode formation artificial structure, going beyond to a fractal is related geometric scaling structure. Specifically, precessional dynamics was measured samples with from simple toward Sierpinski carpet triangle. experimentally observed...

The PELE (penetration with enhanced lateral efficiency) projectile is a new type of safe ammunition which can form large number fragments after perforating the target, and does not depend on any pyrotechnics. damage characteristics mainly include penetration ability fragmentation effect. There are many factors affecting projectile, this paper attempts to study from point view changing single core material. Therefore, four different inner combination types were designed in paper, namely, zero...

The PELE (penetrator with enhanced lateral efficiency) projectile is a new type of penetrator, which has both penetration and fragmentation effects. damage characteristics the have never been studied from perspective changing shape structure until now. This paper hopes to improve power by structural projectile, concept truncated cone-shaped first put forward. In order compare analyze conventional six sets simulation conditions were designed, ability effect used as main evaluation indicators....

Recent studies have shown that the energy release capacity of Polytetrafluoroethylene (PTFE)/Al with Si, and CuO, respectively, is higher than PTFE/Al. PTFE/Al/Si/CuO reactive materials four proportions PTFE/Si were designed by molding–sintering process to study influence different mass ratios on release. A drop hammer was selected for igniting specimens, high-speed camera spectrometer systems used record flame spectrum, respectively. The ignition height material obtained fitting...

Efficiency is critical for autonomous vehicles (AVs), especially emergency AVs. However, most existing methods focus on regular vehicles, overlooking the distinct strategies required by to address challenge of maximizing efficiency while ensuring safety. In this paper, we propose an Integrated Agile Decision-Making with Active and Safety-Critical Motion Planning System (IDEAM). IDEAM focuses enabling AVs, such as ambulances, actively attain in dense traffic scenarios safety mind. Firstly,...

PELE projectile is a new type of armor-piercing warhead and has more obvious fragmentation effect, which solves the problem insufficient after-effects conventional projectiles. Reactive material energetic material, some characteristics similar to traditional explosives but better mechanical properties. insensitive under normal conditions, it can release huge energy external impact loading. This paper hopes study application reactive materials inner core projectiles further improve effect The...

Many reptiles, known as ‘sand swimmers’, adapt to their specific environments by vibrating or rotating body. To understand these type of interactions active objects with granular media, we study a simplified model self-excited spherical object (SO) immersed in the bed, using three-dimensional discrete element method (DEM) simulations. Modelling vibration an oscillatory motion, simulate longitudinal locomotion SO three modes: transverse vibration, rotation around different axes, and...

Abstract Reactive material is a promising new energetic material. In this paper, the damage characteristics of PTFE / Al W reactive impacting on double-layer aluminum target are studied by experiments, and experimental process simulated numerical simulation. The results show that when impacts thin target, there almost no reaction it first plate, mainly occurs second plate. Compared with simulation results, proved ignition growth model can be used in calculation materials.

Many scholars have used experimental research methods to conduct extensive on the impact energy release behavior of Polytetrafluoroethylene(PTFE)/Al reactive materials. However, in numerical simulation, PTFE/Al still lacks calculation parameters behavior. In order obtain simulation ignition, Hill mixture law was calculate material (mass ratio 73.5/26.5), and according Hugoniot curve γ state equation, JWL equation a unreacted substance reaction product fitted with genetic algorithm. According...

Imporous MgB2 bulks with a density of 1.82 g cm−3 have been synthesized by pretreatment B powder in an situ solid-state reaction at ambient pressure. The results show that the has significant improvement Jc, Birr, microstructure and intergranular coupling, but no decrease Tc. At 20 K 4 T, Jc is enhanced 4 times powder. For pretreated MgB2, Birr reaches 5 T 10 K 6 T 2200 A cm−2, compared to 4.2 T 670 A cm−2 for B-not-pretreated MgB2. It argued small amounts highly dispersed carbon may enhance...

The complicated composition of unsaturated clay, e.g., solid mineral particles, water, and air, makes it difficult to get its precise equation state (EOS) over a wide pressure range. In this paper, the high-pressure EOS clay was discussed at mesoscale. With original extracted from southern suburbs Luoyang city, China, three clays with moisture contents 0%, 8%, 15%, respectively, were remolded. Their Hugoniot parameters in range 0–30 GPa measured using one-stage or two-stage light gas gun....

Abstract Many reptiles can move significant distances through sand or many seeds drill out soil during germination by rotating their bodies. Inspired the biological behaviour and challenged absence of physical mechanism for locomotion in granular materials, we developed a numerical study self-excited spherical intruder bed under gravity, using discrete element method. In simulation, was rotated around x-axis with different friction coefficient μ rotation angular velocity ω . We find that...