The study described here is aimed at illuminating deformation mechanism involved in Twin-roll Thin Strip Casting Process (TRSC) with respect to high-permeability 6.5 wt.% Si electrical strip ...(6.5 wt.% Si strip) in terms of crystal plasticity (CP) theory, and a Visco-plastic Self-consistent model (VPSC) was utilized to explore the deformation mechanism by applying crystallographic orientation (OR) analysis. Results underscore that the activation of overall potential single slip system with regard to studied 6.5 wt.% Si strip including {110} , {112} as well as {123} can contribute to the OR conversion from Cube texture to Rotated-Cube texture, α-fiber texture as well as γ-fiber texture, while with different evolution rate during deformation. The potential multi-slip system of {112} +{123} with average number of activated slip system per grain ~9.1–9.4, and multi-slip system of {110} +{112} +{123} with average number of activated slip system per grain ~10.4–10.8 are identified to be the predominant slip systems during deformation by comparing to the actual OR features obtained from TRSC-processed 6.5 wt.% Si strip. The CP-based method proposed in present study is deemed as a reference to investigate deformation behavior involved in the other semi-solid forming process.
Deep learning algorithms have gained widespread usage in defect detection systems. However, existing methods are not satisfied for large-scale applications on surface defect detection of strip steel. ...In this paper, we propose a precise and efficient detection model, named CABF-YOLO, based on the YOLOX for strip steel surface defects. Firstly, we introduce the Triplet Convolutional Coordinate Attention (TCCA) module in the backbone of the YOLOX. By factorizing the pooling operation, the TCCA module can accurately capture cross-channel features to identify the location information of defects. Secondly, we design a novel Bidirectional Fusion (BF) strategy in the neck of the YOLOX. The BF strategy enhances the fusion of low-level and high-level semantic information to obtain fine-grained information. Lastly, the original bounding box loss function is replaced by the EIoU loss function. In the EIoU loss function, the penalty term is redefined to consider the overlap area, central point, and side length of the required regressions to accelerate the convergence rate and localization accuracy. On the benchmark NEU-DET dataset and GC10-DET dataset, the experimental results show that the CABF-YOLO achieves superior performance compared with other comparison models and satisfies the real-time detection requirement of industrial production.
Rolling is the main process in steel production. There are some problems in the rolling process, such as insufficient ability of abnormal detection and evaluation, low accuracy of process monitoring, ...and fault diagnosis. To improve the accuracy of quality-related fault diagnosis, this paper proposes a quality-related process monitoring and diagnosis method for hot-rolled strip based on weighted statistical feature KPLS. Firstly, the process-monitoring and diagnosis model of strip thickness and quality based on the KPLS method is introduced. Then, considering that the KPLS diagnosis method ignores the contribution of process variables to quality, it is easy to misjudge the root cause of quality in the diagnosis process. Based on the rolling mechanism model, the influence weight of strip thickness is constructed. By weighing the statistical data features, a quality diagnosis framework of series structure data fusion is constructed. Finally, the method is applied to the 1580 mm hot-rolling process for industrial verification. The verification results show that the proposed method has higher diagnostic accuracy than PLS, KPLS, and other methods. The results show that the diagnostic model based on weighted statistical feature KPLS has a diagnostic accuracy of more than 96% for strip thickness and quality-related faults.
Avian leukemia is an infectious tumorous disease of chickens caused by subgroup A of the avian leukemia virus (ALV-A), which mainly causes long-term viremia, slow growth, immune suppression, ...decreased production performance, multi-tissue tumors, and even death. The infection rate of this disease is very high in chicken herds in China, causing huge economic losses to the poultry industry every year. We successfully expressed the specific antigen protein of ALV (P27) through recombinant protein technology and screened a pair of highly sensitive monoclonal antibodies (mAbs) through mouse immunity, cell fusion, and antibody pairing. Based on this pair of antibodies, we established a dual antibody sandwich ELISA and gold nanoparticle immunochromatographic strip (AuNP-ICS) detection method. In addition, the parameters of the dual antibody sandwich ELISA and AuNP-ICS were optimized under different reaction conditions, which resulted in the minimum detection limits of 0.2 ng mL
−1
and 1.53 ng ml
−1
, respectively. Commonly available ELISA and AuNP-ICS products on the market were compared, and we found that our established immune rapid chromatography had higher sensitivity. This established AuNP-ICS had no cross-reactivity with Influenza A (H1N1), Influenza A (H9N2), respiratory syncytial virus (RSV), varicella-zoster virus (VZV),
Listeria monocytogenes
listeriolysin (LLO), and
Staphylococcal enterotoxin
SED or SEC. Finally, the established AuNP-ICS was used to analyze 35 egg samples, and the results showed 5 positive samples and 30 negative samples. The AuNP-ICS rapid detection method established by our group had good specificity, high sensitivity, and convenience, and could be applied to the clinical sample detection of ALV-A.
A gold nanoparticle-based immunochromatographic test strip for the detection of avian leukosis virus P27 antigen in egg white samples.
•Flat tube compact heat exchangers with offset strip fins in a very short flow depth is investigated.•Offset strip fins are composed of non-uniform uninterrupted fin length on varying ...intermediates.•The effect of flow direction on the thermal and hydraulic performance with non-uniform uninterrupted fin length is presented.
In this particular work, the flat tube with mini-channel compact heat exchangers with offset strip fins by non-uniform uninterrupted fin length are investigated experimentally. The tests are performed by four different types of flat tube compact heat exchangers. The tests are conducted in the range of 600 < Rea < 2000, while water as the heat transfer fluid is circulated at the inlet of the heat exchanger and regulated by a water bath at a temperature of 42 °C. The performance of the heat exchangers is assessed by using Colburn j-factor, friction factor f, area goodness factor j / f and volume goodness factor j / f1/3. According to the obtained outcomes, the compact heat exchanger with bigger pass number provides better heat transfer. Two different types of strip fins with non-uniform uninterrupted fin length have been tested. The heat exchanger group with 1.55 m length of flat tube shows almost 40% higher performance than the heat exchanger group with 1.20 m length of flat tube.
The rapid reinforcement of reinforced concrete members is one of the research hotspots in the field of structural reinforcement. In this paper, the packaging technology is applied to the field of ...reinforced concrete structure reinforcement, and new technology of composite reinforcement of prestressed plastic steel strips and angle steel is proposed. Furthermore, in this work, axial compression tests of three prestressed plastic steel strips‐angle steel composite reinforced concrete columns and one unreinforced reinforced concrete column were carried out and studied the prestressed plastic steel strips‐clad steel composite reinforcement and plastic steel strips. Furthermore, the effect of different reinforcement spacings on the failure characteristics, bearing capacity, and ductility of components were studied. The test results show that the failure characteristics of the reinforced concrete columns reinforced with prestressed plastic‐steel strips and angle steels were the same as those of unreinforced specimens. However, the initial cracking load of the reinforced specimens was found to be greater and as the spacing of plastic‐steel strips increased, the bearing capacity also increased. Moreover, their values were found to be 36.6%, 13.6%, and 8.2%, and the maximum increase in the limit displacement was 92.9%, 52.7%, and 22.6%, respectively. From the results, it was observed that the composite reinforcement technology could improve the ultimate bearing capacity and the ductility of components and has a good application value.
•Push-out tests on 26 local full-scale encased PBL specimens are conducted to examine the shear performance of UHPC-based PBL groups in the steel–concrete joints of hybrid structures.•Influences of ...the concrete type, row number and row spacing on the shear behavior of UHPC-based PBL shear connector groups are identified experimentally, and the mechanism is discussed in detail.•With a reduction coefficient accounting for the group effect introduced, a simplified and reliable equation for the ultimate capacity of multirow PBLs embedded in ordinary concrete or UHPC is proposed and verified.•A simplified evaluation of the shear safety of PBLs encased in UHPC is performed based on the existing design codes and the proposed equations, and certain suggestions for the structural design of steel–concrete joints using the UHPC are provided.
The group effect on the shear capacity of perfobond strip (PBL) connector group embedded in ultrahigh performance concrete (UHPC) in the steel–concrete joints of hybrid structures was studied experimentally. Push-out tests were performed on 26 encased PBL specimens parameterized by the concrete type, row (or hole) number, and row spacing of connectors. The test results revealed that the failures of all the connections were characterized by the shear fracture of the reinforced concrete dowels. The average ultimate capacities per row of shear connectors in UHPC without steel fibers and with 2% volume fraction of steel fibers were approximately 19% and 42% higher, respectively, than those in C55 normal concrete, owing to the high shear strength of the matrix in UHPC and further enhancement by steel fibers. The effect of increasing the row number from 1 to 3 was a decrease of approximately 17% in the average ultimate load per row of connectors. Similarly, a decrease in row spacing from 3.85 to 2.0 times the hole diameter caused an approximately 14% decrease in the average ultimate load per row. With a reduction coefficient accounting for the group effect introduced, an alternative equation for the ultimate capacity of multirow PBLs was proposed, verified, and adopted in the simplified shear safety evaluation.
Electrodynamic characteristics of a multigap loop antenna immersed in a homogeneous magnetoplasma are studied using the integral equation method. The antenna has the form of a perfectly conducting, ...infinitesimally thin, narrow strip coiled into a ring with its axis parallel to an external static magnetic field. The antenna current is excited by appropriately phased external voltages applied across the gaps of the strip. A closed-form solution for the current distribution of the antenna is obtained, and the elements of its input admittance matrix are found. Based on this solution, conditions are determined under which such an antenna with phased excitation is capable of selectively exciting waves with given azimuthal indices in the surrounding magnetoplasma.
A portable fluorescence biosensor with rapid and ultrasensitive response for Clenbuterol (CL) has been built up with fluorescent nanosilica and a lateral flow test strip. Quantitative detection of CL ...was realized by recording the fluorescence intensity of fluorescent nanosilica captured on the test line. The sensing results indicated that the sensitivity of the fluorescent nanosilica-based strip was better than that of conventional colloidal gold-based strips. The visual limit of detection of the strip for qualitative detection was 0.1ng/mL while the LOD for quantitative detection could down to 0.037ng/mL by using fluorescence biosensor. The recoveries of test samples were from 89.3% to 97.7%. The assay time for CL detection was less than 8min, suitable for rapid testing on-site.
•Rapid and sensitive detection of CL using a portable fluorescence biosensor is achieved.•Lanthanide chelate Eu(III)–BHHCT is introduced into porous silica nanoparticles to form the stable fluorescent organosilica with desirable luminescence properties.•Fluorescent organosilica labeled antibody is designed as the probe of the one-step optical-based competitive immunochromatographic strip sensor.•Determination of CL in swine urine samples is studied.•The sensing strategy provides a promising approach for on-site applications.
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