Abstract Interpretation of high‐resolution two‐dimensional (2D) and three‐dimensional (3D) seismic data collected in the Qiongdongnan Basin, South China Sea reveals presence polygonal faults, pockmarks, gas chimneys slope failure strata Pliocene younger age. The are characterized by low‐amplitude reflections, acoustic turbidity low P‐wave velocity indicating fluid expulsion pathways. Coherence time slices show that faults restricted to sediments with moderate‐amplitude, continuous...

In order to achieve the goal of 'carbon neutral' development, under conditions carbon quota trading policy, consumers' preference for fresh agricultural products and low-carbon preference, this paper discusses equilibrium decision-making problem a two-level supply chain. And cost sharing contract two-part pricing are introduced coordinate The results show that: fresh-keeping efforts made by produce suppliers related preferences, costs, emission factors, reduction efficiency; certain...

Gas-phase studies of fullerenes and metallofullerenes, though less well explored compared to condensed-phase research in recent years, offer critical insights into the mechanisms governing their formation behavior. In this study, we re-examined coalescence reactions using a high-resolution Fourier transform ion cyclotron resonance (FT ICR) mass spectrometer, especially effect electric fields source region on large-sized fullerenes. By varying voltages metal plate where C60 was deposited,...

We investigate the feasibility of laser-induced breakdown spectroscopy for determination heavy metal Pb in a Pb(NO3)2 aqueous solution by using simple homemade vertical jet device and nanosecond laser pulses. Key experimental parameters that affect analytical performance, such as delay time observation, pulse energy, liquid flow rate are optimized best limit detection (LOD). The LOD was determined I emission at 405.781 nm, after optimization, 3σ found to be level 60 ppm.

To improve the quantitative analysis accuracy of an aqueous solution using surface-enhanced laser-induced breakdown spectroscopy (SENLIBS), filter paper was used as a transmission medium by placing it onto surface metallic substrate to make microdroplet spreading more uniform in fixed region surface. The trace elements (Cu, Pb, Cd, and Cr) were detected successfully this method. results showed that sample preparation repeatability SENLIBS noticeably improved with aid paper. Moreover, limit...

A new family of supramolecular heparin-based biohybrid metallogels with multiple stimuli-responsive behaviours was constructed through the controlled self-assembly based on three orthogonal interactions within a single system.

In this work, the threshold photoionization cross sections from excited states of lutetium and ytterbium atoms were investigated by laser pump–probe scheme under condition saturated resonant excitation. We obtained resonance enhanced multiphoton ionization spectra lanthanide metals in range 307.50–312.50 nm 265.00–269.00 nm, respectively; 5d6s(1D)6p(2D05/2) 5d6s(3D)6p(2P01/2) 4f13(2F0)5d6s2(J = 1) above regions (0.4–1.6 eV) measured, measured values ranged 2.3 ± 0.2 to 17.7 1.5 Mb.

Food selection by herbivores depends on the dietary composition of plant parts. However, nutritional properties tropical bamboo leaves, which could be a viable supplement traditional fodder are hardly examined. Proximate Bambusa ventricosa McClure, Oxytenanthera abyssinica (A. Rich.) Munro and two varieties vulgaris (B. Schrad. ex J. C. Wendl. var. Hort. B. vittata Rivière) leaves were determined. proximately comprised 10.34% moisture, 1.38% crude fat, 11.56% ash, 19.02% protein, 27.20%...

The quality of agri-foods in e-supply chains confronts more threats than that the traditional agri-food supply chain. However, most existing studies focusing on problems fresh agri-products are mainly cases and statistical analyses, they do not take into account farmers’ willingness to comply with safe procedures. To solve help participators make a better choice, decision-making behavior chain was deeply studied this paper using game theory. Some factors related decision were analyzed,...

In this study, chemical replacement combined with surface-enhanced laser-induced breakdown spectroscopy (CR-SENLIBS) was introduced for detecting the trace chromium (Cr) element in an aqueous solution, which could use to change sample from liquid solid. order illustrate analytical-performance of CR-SENLIBS, direct analysis surface by LIBS (LSLIBS) investigated comparison. The results show that spectral intensity Cr I 357.86 nm, plasma lifetime, and stability were improved. Moreover, limit...

The perishable nature of fresh agricultural products and their vulnerability to environmental impacts make product supplies susceptible more complex social risks unpredictable natural risks. This study identifies 13 risk factors that could adversely affect the supply uses ISM MICMAC develop a hierarchical structure analyze correlation these factors. results showed have strong positive correlation, reasonable risk-sharing mechanism should be established for improvement in supervision error...

To improve the detection sensitivity of aqueous solution using surface-enhanced laser-induced breakdown spectroscopy (SENLIBS), number sample preparation in a fixed point was increased. The trace elements (Cu, Pb, Cd, and Cr) an were detected successfully this method. results showed that spectral intensity strengthened. limit (LoD) values reduced from 0.034~0.058 to 0.019~0.033 μg/mL by increasing repeating preparation. This demonstrated quantitative analysis SENLIBS could be improved repeatability.

The use of multi-compartment vehicles (MCVs) in urban logistics distribution is increasing. However, traffic congestion causes high carbon emissions the distribution, resulting unsustainable development transportation. In addition, application mixed policy has gradually become first choice for energy conservation and emission reduction some countries regions. transportation industry a major carbon-emitting industry, which needs to be constrained by policies. this context, research on vehicle...

This study undertakes a comprehensive analysis of vegetable production efficiency in China using input–output data from 30 provinces spanning 2011 to 2017. By incorporating environmental pollution costs as undesirable outputs alongside output value, we employ Data Envelopment Analysis (DEA) with the Banker, Charnes, and Cooper (BCC) model Malmquist index model. Our assessment reveals both annual inter-period changes. The findings highlight modest overall China’s significant regional...

Abstract Crystal structural rearrangements unavoidably introduce defects into materials, where even these small changes in local lattice structure could arouse a prominent impact on the overall nature of crystals. Contrary to traditional notion that obstruct carrier transport, herein, we report promoted transport mechanism nonluminescent carriers single‐crystalline CH 3 NH PbI nanowires (1345.2 cm 2 V −1 s , about 14‐fold improvement), enabled by phase transition induced (PTIDs). Carriers...

Resonance-enhanced multiphoton ionization (REMPI) of Ti, Co, and Ni atoms has been investigated in the 285–320 nm region. We couple a laser-ablated metal target into molecular beam to produce atoms. Ions produced from photoionization neutral are monitored by home-built time-of-flight mass spectrometer. Photoionization cross sections excited states were deduced dependence ion signal intensity on laser for photon energies close threshold. The values obtained range 0.2 6.0 Mb. No significant...

Compared to single ion/electron-optics for velocity-map imaging, a double-focusing lens assembly designed not only allows mapping velocity imaging of photoelectrons but also investigating the vibrational structure intermediate states neutral species in resonance enhanced multiphoton ionization (REMPI) spectra. In this presentation, order record REMPI and photoelectron spectra separately, we have constructed compact (VMI) apparatus combined with an opposite linear Wiley-Mclaren time-of-flight...

We present measurements of photoionization cross-sections the excited states cobalt using a two-color, two-step resonance ionization technique in conjunction with molecular beam time flight (TOF) mass spectrometer. The atoms were produced by laser vaporization rod, coupled supersonic gas jet. absolute at threshold and near-threshold regions (0-1.2 eV) measured, measured values ranged from 4.2±0.7 Mb to 10.5±1.8 Mb. lifetimes four odd parity energy levels are reported for first time.

Considering the carbon emissions caused by fresh-keeping of fresh agricultural products, this paper studied rules decision-making in two-echelon product supply chain led suppliers under cap-and-trade policy. In addition, we designed two contracts, cost-sharing contract and two-part pricing contract, to coordinate supplier's decision chain's revenue. The results show that: whether policy is implemented or not, higher consumer's preference for freshness lower price sensitivity coefficient...

Based on the realistic concerns about improvement of quality agricultural foods (agri-foods), optimal supply and price subsidy strategies producers sellers for two-level chain, composed a producer seller, are studied. The differences in safety, price, market demand agri-foods chain compared analyzed. study found that maximum profit participants decreases with increase elasticity demand. When is upgraded producer-led manner, does not undergo substantial improvement, operators insensitive to...

Under the optimum experimental condition, analytical spectral lines of Fe and Ni trace elements in Pb-Cu alloy are determined experiment. The laser-induced breakdown spectroscopy(LIBS) calibration curves also buffer gases He, Ar, Air vacuum. standard fit errors for range from 0.02 to 0.08.

The ultrafast carrier relaxation processes in CdTe quantum dots are investigated by femtosecond fluorescence up-conversion spectroscopy. Photo-excited hole relaxing to the edge of forbidden gap takes a maximal time ∼ 1.6 ps with exciting at 400 nm, depending on state photo-excited hole. shallow trapped states and deep trap confirmed for dots. In addition, Auger carriers is observed occur constant 5 ps. A schematic model photodynamics established based results spectroscopy studies. Our work...

Resonance enhanced multiphoton ionization(REMPI) dissociation channels of acetone were studied using REMPI-TOF-MS and mass-selected excitation spectra in the range 280—286.5nm. The fragment ions analyzed identified. It was shown that main channel is photoionization parent molecule firstly 280—286.5nm, then followed by photodissociation ion.