Abstract Doping has been used to enhance the ionization efficiency of analytes in atmospheric pressure photoionization, which is based on charge exchange. Compounds with excellent efficiencies are usually chosen as dopants. In this paper, we report a new phenomenon observed low-pressure photoionization: Protonation enhancement by dichloromethane (CH 2 Cl ) doping. CH not common dopant due its high energy (11.33 eV). The photoionization source was built using krypton VUV lamp that emits...

Inferring local soot temperature and volume fraction distributions from radiation emission measurements of sooting flames may involve solving nonlinear, ill-posed high-dimensional problems, which are typically conducted by problems with big matrices regularization methods. Due to the high data throughput, they usually inefficient tedious. Machine learning approaches allow such offering an alternative way deal complex dynamic systems good flexibility. In this study, we present original...

An original convolutional neural network, i.e. U-net approach, has been designed to retrieve simultaneously local soot temperature and volume fraction fields from line-of-sight measurements of radiation fields. A five-stage architecture is established detailed. Based on a set N2 diluted ethylene non-premixed flames, the minimum batch size requirement for model training discussed prediction ability validated first time by provided modulated absorption emission (MAE) technique documenting...

We originally report the use of a neural network-based method for diagnosing multiple key parameters in axis-symmetric laminar sooting flames. A Bayesian optimized back propagation network (BPNN) is developed and applied to flame luminosity predict planar distribution soot volume fraction, temperature, primary particle diameter. The feasibility robustness this approach are firstly assessed using numerical modeling results then further validated with experimental series diffusion This...

A variant of secondary ion mass spectrometry is presented where the surface bombarded with individual gold nanoparticles each resolved in time and space a corresponding event-by-event detection ions (SIs). The projectile used, Au4004+, impact energy 136 keV, generates high SI yields. Typically, there co-emission multiple SIs from single impact, i.e., emission molecules co-located within nanovolume dimensions 10-nm range. ability to detect was tested on samples consisting alternating...

Solid dispersion has an important effect on fuel distribution and temperature uniformity in a circulating fluidized bed (CFB) boiler furnace. To investigate lateral axial solid behavior large-scale CFB furnaces, the multiphase particle-in-cell (MP-PIC) method coupled with chemical reactions was established using 350 MW as object. Influence factors including superficial velocity, primary air ratio, particle size dp, density ρp were studied numerically. In addition, characteristics property...

The accuracy of ion implantation is very important in semiconductor manufacturing and will directly affect the performance individual devices even whole chip. deviation IMP energy, dose angle are often encountered because abnormality implant equipment or process design limit. information can be qualitatively quantitatively analyzed through SIMS [2], which provides a way to diagnose issue implanter. Based on analysis results, we judge whether results meet requirements achieves expected goal....

Doping has been used to enhance the ionization efficiency of analytes in atmospheric pressure photoionization, which is based on charge exchange. Compounds with excellent efficiencies are usually chosen as dopants. In this paper, we report a new phenomenon observed low-pressure photoionization: Protonation enhancement by dichloromethane (CH2Cl2) doping. CH2Cl2 not common dopant due its high energy (11.33 eV). The photoionization source was built using krypton VUV lamp that emits photons...

Abstract This paper designs an agricultural machinery positioning monitoring system, which can collect the information of operation, and is great significance for precision agriculture. The system uses stm32f103rct6 as controller, with Beidou + GPS dual module display screen other related accessories, to achieve accuracy real-time machinery.

Engine spray models based on phase equilibrium have made great progress in simulating trans/supercritical engine processes, but there are inherent weaknesses terms of efficiency and stability for the conventional algorithm due to iterative schemes solving complex nonlinear equations. The low limits amount detail that can be considered simulation, while instability may lead unphysical results or even simulation divergence. In this work, a method artificial neural networks (ANNs) was developed...

In fact, the constant directivity characteristic of line array loudspeaker cannot cover all frequency. order to expand entire working frequency band as much possible, that is, obtain a lower cut-off and reduce high aliasing phenomenon, this paper proposes division shading algorithm based on acoustic waveguide linear delay beamwidth transducer(CBT) array. After simulation in matlab, sound field traditional is compared, it effectively verified has wider than algorithm. particular, reduces...

With the rapid development of mobile communication technology, network is quickly upgrading with 5G and more advanced allocations band frequency. As a result, quartz crystal resonators as core component signal processing functions have also been challenged strict requirements on frequency stability for these new bands. At present, continue to grow in direction high fundamental miniaturization required stability. Traditional techniques can no longer meet demands, which makes laser attractive...