A total of 76 sampling sites were selected in the Liao River basin (21.9×104km2). During period 2009-2010, 58 water samples collected 2010 and 42 2009, physical-chemical variables analyzed to investigate their spatial-temporal variability particular relationship with land use /cover. The results indicated that physical chemical properties showed obvious spatial heterogeneity basin. Taizi Hun are located southeast basin, quality for two sub-basins: upstream is better than downstream, level...

The interaction between a bridge and train moving on the is coupled dynamic problem. equations of motion vehicle are by time dependent contact forces. At each step, influences forces transferred to this, in turn, changes acting bridge. In this paper, comparison three different domain solution algorithms for equation train–bridge system presented. Guidelines given good choice step.

Aims. We constructed models of the structure and evolution stars including diffusion extra-mixing caused by rotation to estimate stellar parameters solar twin 18 Scorpii.

The heavy-haul train dynamic performance under emergency braking is complex and directly affects the reliability running safety. To reveal behaviour in process on long downhill segments, a comprehensive longitudinal-vertical coupled dynamics model (HTLVDM) that considers air system coupler draft gear established this paper. HTLVDM components of locomotive wagon, such as wheelset, bogie frame, car body. force nonlinear hysteresis characteristic system. delay time pressure variation brake...

We intent to use stellar models with and without alpha-enhancement, as well asteroseismic analysis, study two alpha-enhanced stars, KIC 7976303 8694723. For the models, we adopt [alpha/Fe] = 0.2, 0.4. evolved sub-giant mixed-modes, fit observations better than point a star M 1.20 $\pm$ 0.02 M_odot, t 4.88 0.08 Gyr, R 2.04 0.01 R_odot, L 5.07 0.05 L_odot. post turnoff 8694723, find that in all three cases ([alpha/Fe] 0.0, 0.4). According observed metal abundances, only alpha- enhanced are...

Oxygen and carbon are important elements in stellar populations. Their behavior refers to the formation history of C O abundances would also obviously influence opacities overall metal abundance $Z$. With observed high-quality spectroscopic properties, we construct models with elements, give more accurate ages for 70 metal-poor dwarfs, which have been determined be high-$\alpha$ halo, low-$\alpha$ halo thick-disk stars. Our results show that stars relatively older than by around 2.0 Gyr. The...

In order to estimate the mass and age of stars, we construct a grid stellar models for eight solar-analog stars including diffusion rotation-induced mixing given ranges mass, metallicity, rotational rate. By combining with observational data lithium abundance, obtain more accurate estimations stars. The results indicate that HIP 56948, 73815, 78399 are three possible solar twins. Furthermore, find depletion due extra-mixing in analogs strongly depends on history. Therefore, abundance can be...

To study the effects of magnetic fields on lithium depletion and to explain characteristics evolution in F- G-type stars open clusters, we construct a stellar model that includes Tayler–Spruit dynamo-type field. Through examining features extra-mixing caused by interiors relationship between input parameters (i.e., mass, metallicity, initial rotational condition), find produces processes different from other models. During pre-main sequence, exhibits very efficient extra-mixing, resulting...

A time-domain numerical method to achieve reconstruction of conductor cylinders was considered in this paper. And the obstacle is characterized by discrete points. The electric field and magnetic on extrapolated boundary are solved Time-Domain Finite Element Method (TD-FEM), than far-field value obtained from it. Genetic Algorithm (GA) real differential evolution strategy adopted as optimization method. Norm point's radius vector set independent variables for fitness function. perimeter...

The aim of this paper is to determinate the fundamental parameters six exoplanet host (EH) stars and their planets. Because techniques for detecting exo-planets yield properties planet only as a function star, we must accurately determine EH first. For reason, constructed grid stellar models including diffusion rotation-induced extra-mixing with given ranges input (i.e. mass, metallicity initial rotation rate). In addition commonly used observational constraints such effective temperature...

The time-domain finite element method is used extensively in areas of microwave engineering. However, TD-FEM runs too slow for some simulations to be practical, especially when run on standard personal computers. propriety hardware the acceleration computations has been investigated. It well known that key matrix operation. There always an obstacle speedup dense matrices operations Graphics Processor Units fields. This situation will improved next generation. Even though presence obstacle,...

Aims. The lithium abundances of KIC 11395018 and 10920273 are not compatible with the age these stars, which is deduced by asteroseismology. To explain this phenomenon, we investigated possible evolutionary status performed a seismological analysis three stars 11395018, 10273246, 10920273.

The valve-side bushing of UHV converter transformer carries a large multi-frequency superimposed current, and it is prone to local overheating faults such as the copper-aluminum transition zone contact finger ablation strap. In order verify temperature rise characteristics transformer, thermal performance test system DC established in this paper. method with high ambient temperatures current was put forward, carried out. results show that axial radial inside core are unevenly distributed,...

When the MEI coefficients are found by traditional method, accuracy of 5-points or 7-points not better, and even worse than that 3-points [1]. The results very depressing. However, this paper expend self-metron discuss 7-points. simulation show is much better 3-points, method. advantage could be replaced 5-points.

High-frequency (HF) oil-immersed transformers with small size and light weight, have been paid widely attention by researchers at home abroad. The oil-paper insulation of HF frequently withstands high-frequency overvoltages frequencies several kHz above caused the development power electronic devices towards high frequency power, resulting in too early failure due to partial discharge (PD). In this study, we try analyse PD characteristics voltages using pulse current method. experimental...