Abstract The contamination of soil and plants with heavy metals, which has detrimental influences on plant growth, water purification, food safety, emerged as a serious global issue. To better understand the spatial variations metals associated city development land use types, we collected samples Magnolia grandiflora branches to quantify lead (Pb) cadmium (Cd) contents roadside, industrial, residential, park greenbelts in Hefei City, China. We found that Pb content was highest roadside...

Background Forest and plantation intercropping are efficient agroforestry systems that optimize land use promote around the world. However, diverse on same upper-plantation differently affect physical chemical properties of soil. Methods The treatments for this study included a single cultivation (CK) pecan control three (pecan + Paeonia suffruticosa Hemerocallis citrina , lactiflora ). Soil samples were categorized according to sampling depth (0–20 cm, 20–40 40–60 cm). Results results...

The operational performance of high-speed railway bridges is controlled by stiffness, and the reduction in bridge stiffness leads to a decline ride comfort. Therefore, it very important periodically evaluate bridges. To reasonably without operation interference, evaluation method proposed this paper based on regularly solving deflection limit most unfavorable monitoring data. First, analytical solution any that meets comfort requirements derived using real displacement train wheelset. Then,...

The dynamic behaviors of the bridge structures have great effects on comfortability and safety running high-speed trains, which can also reflect structural degradation. This paper aims to reveal characteristics induced by train loadings for a combined highway railway bridge. Monitoring-based analysis acceleration displacement girder is carried out. vertical are analyzed; spatial variability train-induced lateral studied; statistical has been performed daily extreme values deflections. It...

Abstract Background There are several types of tenodesis reconstruction designed for subtalar instability. However, no comprehensive comparison has been conducted among these procedures in terms their correcting power so far. The objective this study is to evaluate the biomechanical behaviors 5 representative through finite element analysis. Methods Finite models were established and validated based on one our previous studies. Pisani interosseous talocalcaneal ligament (ITCL)...

The present work is concerned with the dynamic behavior of a circular ring loaded between wedge-shaped indenter and rigid plate. First, an analytical model using rigid-plastic theory established. effects strain-hardening strain-rate are incorporated. history displacement, velocity reaction force energy absorbed by obtained. Further, to verify proposed model, numerical simulations experiments performed compared predictions. It found that solutions compare well experiments. This study provides...

The lightning trip-out accidents of Shiyan transmission lines occur frequently. parameters, faults and geography 220kV shi-xuan line have been collected. striking simulation model has built by using electromagnetic transient calculation software ATP-EMTP multi-wave impedance model. withstanding level tower the rate calculated. actual operation considered in order to evaluate risk trip-out. results can provide guidance for protection linewhich locates mountains.

Sag is an important indicator of the operational health a transmission line, and its timely measurement great significance to maintain stability reliability power systems. However, traditional contact measurements may be affected by electromagnetic interference conductors. In contrast, methods without direct electrical with subject provide greater portability flexibility. This paper presents study line sag simulation based on non-contact electric field sensing. The finite element method was...

The paper presents a developed design and simulation software package of switched reluctance motor drives for Windows 9x in Chinese. main interfaces such as the start interface, 2-D finite element electromagnetic field calculation power converter circuit networks interface are given. functions introduced, seven structure SRM, nonlinear ten circuits with four variable speed control strategies, display printing pictures.

For high-performance concrete (HPC) beams reinforced with hybrid Carbon Fiber Reinforced Polymer/Glass Polymer (CFRP/GFRP) tendons, the nonlinear shell beam mixed element is studied and whole mechanical process analyzed. The CFRP/CFRP tendons are simulated spatial HPC modeled layered element. With coordination of nodal linear displacement rotational CFRP/GFRP element, contribution to stiffness matrix deduced. Then, Jiang’s yielding criterion, Hinton’s crushing so on, used describe material...

High-temperature heat pumps (HTHP) can play an extremely important role in reducing carbon emissions industry heating. At the same time, with low global warming potential (GWP) refrigerants need to be developed and promoted urgently, especially after Kigali amendment entering into force. Therefore, advanced high-temperature pump green refrigerant R1233zd(E) is evaluated under 50 ℃ temperature lift conditions this study. The HTHP unit equipped high-efficiency centrifugal compressor enhanced...