The Relationship between Tensile Strain and Residual Stress of High Strength Dual Phase Steel Sheet

The relation between residual stress and tensile strain is an important factor for evaluating plastic formation grade of steel sheet. The degree of plastic deformation (Δl) and elastic recovery (δ) were obtained by measuring the length of DP600 steel sheet sample under different tensile test conditions, i.e. five tensile strains (ε). Furthermore, the average residual stress value in the surface middle (the diameter of 10 mm) region of above tensile samples was analyzed by x-ray diffraction (XRD) in the crystal plane of (211). By processing the diffraction peak angle (2θ) with half width high method (FWHM), the relationship between sin2(ψ) and diffraction angle is attained by least squares method. On this basis, a mathematical model was established to correlate the tensile strain with the residual stress in the present study. The results show that the residual stress decreases and the elastic recovery increases with the increase of tensile strain (ε≤0.205). The relation between residual stress and tensile strain can be described with an exponential function . Finally, a function of tensile strain, elastic recovery and surface residual stress is established, by which a reasonable forming condition, viz. ε=0.205, δ=2.65 mm is determined for achieving the smallest σψ

Simultaneous Removal of NOx and SO2 by MgO Combined with O-3 Oxidation: The Influencing Factors and O-3 Consumption Distributions

Simultaneous removal of NOx and SO2 by MgO combined with O-3 oxidation was studied. The effects of the O-3/NO molar ratio, oxidation temperature, and oxidation residence time on N2O5 decomposition and O-3 consumption distributions were systematically illustrated, which is of great significance for improving NOx removal efficiency and reducing O-3 consumption in practical application. When the O-3/NO molar ratio was greater than 1.0, the highest N2O5 yield was achieved at 90 degrees C. The NOx removal efficiency reached 96.5% at an O-3/NO molar ratio of 1.8. The oxidation temperature increased from 90 to 130 degrees C, resulting in the decrease of N2O5 yield, the improvement of O-3-ICC (O-3 invalid cycle consumption) caused by N2O5 decomposition, and the decrease of NOx removal efficiency from 96.5 to 76%. Besides, the effects of pH, SO2 concentration, and MgSO3 addition on NOx removal efficiency were also investigated. The results showed that the removal efficiency of NO(x )decreased with the increase of SO2 concentration, while MgSO3 addition into MgO slurry could promote the absorption of NO2 due to the reaction between NO2 and SO32-

Giant thoracic hematoma post-transradial coronary angiography: a case report and review of the literature

Abstract Background Although there are cardiac interventional procedures, certain transradial access complications might be life-threatening. Case presentation A 67-year-old male was admitted for coronary angiography due to chest tightness and shortness of breath on exertion. Hours after the right transradial access angiography, the patients complained the right side of chest pain. Emergent chest X-ray revealed a giant mass in the right chest. The right radial artery was reaccessed and subsequent arteriograms confirmed that the presence of a rupture of the branch of right internal mammary artery. Simultaneously, a microcoil was implanted to seal the perforation. The perforation caused a thoracic hematoma measuring 13.8 cm × 6.7 cm, along with a decrease in hemoglobin concentration from 14.1 g/dL to a minimum of 7.8 g/dL. Additionally, the drainage of the hematoma and red blood cells transfusion were carried out. Further, the patient underwent ascending aortic replacement, aortic valve replacement, mitral valve replacement, and thoracic hematoma removal. Postoperative echocardiography showed that the prosthetic valves were properly positioned and functioning normally. The patient recovered well after the surgery and remained event-free during the latest 14moth follow-up period. Conclusions Vascular perforation and subsequent hematoma might occur due to guidewire maneuvering during transradial approach. Awareness of prevention, early recognition and management of access complications may help reduce the occurrence and severity of complications related to the transradial approach

Effect of Magnetic Field Technology on Preservation Quality of Fresh-cut Apple

[Objectives]The paper was to study the effect of magnetic field technology on physicochemical properties of fresh-cut apple during storage. [Methods]Using fresh-cut apples as materials, magnetic field assisted refrigeration and conventional refrigeration control groups were set up, and the preservation effects of magnetic field assisted refrigeration on fresh-cut apples were tested by measuring the changes of microorganisms and physicochemical indicators. In this experiment, the conditions of magnetic field assisted refrigeration group was set as follows: temperature 4 ℃, magnetic field intensity 5 mT, static magnetic field, and storage for 6 d. [Results]At 6 d post storage, the weight loss rate, total number of colonies and total number of fungi of fresh-cut apples increased; the L*value and hardness showed a downward trend; the soluble solid content first increased and then decreased; and the total acid decreased first and then increased. The above indicators in magnetic field assisted refrigeration group changed more gently than that in conventional refrigeration group. Compared with conventional assisted refrigeration, the weight loss rate of fresh-cut apples treated by magnetic field combined with 4 ℃ refrigeration was reduced by 68.00%; the hardness was increased by 12.23%; the total number of colonies and total number of fungi were reduced by 64.15% and 37.50%; and the L*value did not change much. High content of soluble solids and total acid was maintained. [Conclusions]Magnetic field assisted refrigeration delays quality deterioration of fresh-cut apples during storage, prolongs shelf life, and further improves their edible quality and commodity value

Effect of Magnetic Field Technology on Preservation Quality of Fresh-cut Apple

[Objectives]The paper was to study the effect of magnetic field technology on physicochemical properties of fresh-cut apple during storage. [Methods]Using fresh-cut apples as materials, magnetic field assisted refrigeration and conventional refrigeration control groups were set up, and the preservation effects of magnetic field assisted refrigeration on fresh-cut apples were tested by measuring the changes of microorganisms and physicochemical indicators. In this experiment, the conditions of magnetic field assisted refrigeration group was set as follows: temperature 4 ℃, magnetic field intensity 5 mT, static magnetic field, and storage for 6 d. [Results]At 6 d post storage, the weight loss rate, total number of colonies and total number of fungi of fresh-cut apples increased; the L*value and hardness showed a downward trend; the soluble solid content first increased and then decreased; and the total acid decreased first and then increased. The above indicators in magnetic field assisted refrigeration group changed more gently than that in conventional refrigeration group. Compared with conventional assisted refrigeration, the weight loss rate of fresh-cut apples treated by magnetic field combined with 4 ℃ refrigeration was reduced by 68.00%; the hardness was increased by 12.23%; the total number of colonies and total number of fungi were reduced by 64.15% and 37.50%; and the L*value did not change much. High content of soluble solids and total acid was maintained. [Conclusions]Magnetic field assisted refrigeration delays quality deterioration of fresh-cut apples during storage, prolongs shelf life, and further improves their edible quality and commodity value