This research presents an experimental study of analysis of stress strain state SSS of X-60 pipe weld joints employing magnetic anisotropy indicator of mechanical stresses Stress Vision (IMS) using of “before and af...This research presents an experimental study of analysis of stress strain state SSS of X-60 pipe weld joints employing magnetic anisotropy indicator of mechanical stresses Stress Vision (IMS) using of “before and after” comparison approach taking readings on pipe base metal, weld area and heat affected zone (HAZ) before and after hydrotest. Test results were compared with X-ray testing results for welded joints and with metallographic testing. Test results demonstrate the relevance of applied test conditions and redistribution of residual stresses. A new equation was established for estimating the residual (technological) and operating stresses in other pipelines with a tolerance of 15% in the field of elastic deformation (up to the yield point), according to Hooke law.展开更多
BACKGROUND Severe pneumonia is a common severe respiratory infection worldwide,and its treatment is challenging,especially for patients in the intensive care unit(ICU).AIM To explore the effect of communication and co...BACKGROUND Severe pneumonia is a common severe respiratory infection worldwide,and its treatment is challenging,especially for patients in the intensive care unit(ICU).AIM To explore the effect of communication and collaboration between nursing teams on the treatment outcomes of patients with severe pneumonia in ICU.METHODS We retrospectively analyzed 60 patients with severe pneumonia who were treated at the ICU of the hospital between January 1,2021 and December 31,2023.We compared and analyzed the respiratory mechanical indexes[airway resistance(Raw),mean airway pressure(mPaw),peak pressure(PIP)],blood gas analysis indexes(arterial oxygen saturation,arterial oxygen partial pressure,and oxygenation index),and serum inflammatory factor levels[C-reactive protein(CRP),procalcitonin(PCT),cortisol(COR),and high mobility group protein B1(HMGB1)]of all patients before and after treatment.RESULTS Before treatment,there was no significant difference in respiratory mechanics index and blood gas analysis index between 2 groups(P>0.05).However,after treatment,the respiratory mechanical indexes of patients in both groups were significantly improved,and the improvement of Raw,mPaw,plateau pressure,PIP and other indexes in the combined group after communication and collaboration with the nursing team was significantly better than that in the single care group(P<0.05).The serum CRP and PCT levels of patients were significantly decreased,and the difference was statistically significant compared with that of nursing group alone(P<0.05).The levels of serum COR and HMGB1 before and after treatment were also significantly decreased between the two groups.CONCLUSION The communication and collaboration of the nursing team have a significant positive impact on respiratory mechanics indicators,blood gas analysis indicators and serum inflammatory factor levels in the treatment of severe pneumonia patients in ICU.展开更多
A geometrically characteristic and thermodynamically consistent theory is proposed to describe the full-life mechanics of metallic solids undergoing large deformation.The theory is geometrically characteristic in the ...A geometrically characteristic and thermodynamically consistent theory is proposed to describe the full-life mechanics of metallic solids undergoing large deformation.The theory is geometrically characteristic in the sense that the inelastic deformation caused by various crystalline defects is decomposed into a deviatoric part,a volumetric part,and a geometrically insensitive part,and the system thermodynamics is then formulated.The theory reaches its closure by including a finite-strain plastic flow rule originating from the postulate of maximum dissipation,and a set of thermodynamically consistent kinetic equations for the geometrically characteristic field quantities.The present theory is distinguished from existing ductile damage models in the following aspects.Firstly,the proposed geometrically characteristic measure of plasticity is conceptually valid throughout the whole deformation stage,enabling the calibration of the present theory simply against uniaxial loading data.Secondly,the stress calculation here is shown to be unconditionally convergent,and this is in contrast to the use of incremental tangent stiffness matrices whose eigenvalues inevitably turn negative in the softening stage.Thirdly,the anisotropic hardening behaviour can be modelled with low calibration requirements.展开更多
文摘This research presents an experimental study of analysis of stress strain state SSS of X-60 pipe weld joints employing magnetic anisotropy indicator of mechanical stresses Stress Vision (IMS) using of “before and after” comparison approach taking readings on pipe base metal, weld area and heat affected zone (HAZ) before and after hydrotest. Test results were compared with X-ray testing results for welded joints and with metallographic testing. Test results demonstrate the relevance of applied test conditions and redistribution of residual stresses. A new equation was established for estimating the residual (technological) and operating stresses in other pipelines with a tolerance of 15% in the field of elastic deformation (up to the yield point), according to Hooke law.
文摘BACKGROUND Severe pneumonia is a common severe respiratory infection worldwide,and its treatment is challenging,especially for patients in the intensive care unit(ICU).AIM To explore the effect of communication and collaboration between nursing teams on the treatment outcomes of patients with severe pneumonia in ICU.METHODS We retrospectively analyzed 60 patients with severe pneumonia who were treated at the ICU of the hospital between January 1,2021 and December 31,2023.We compared and analyzed the respiratory mechanical indexes[airway resistance(Raw),mean airway pressure(mPaw),peak pressure(PIP)],blood gas analysis indexes(arterial oxygen saturation,arterial oxygen partial pressure,and oxygenation index),and serum inflammatory factor levels[C-reactive protein(CRP),procalcitonin(PCT),cortisol(COR),and high mobility group protein B1(HMGB1)]of all patients before and after treatment.RESULTS Before treatment,there was no significant difference in respiratory mechanics index and blood gas analysis index between 2 groups(P>0.05).However,after treatment,the respiratory mechanical indexes of patients in both groups were significantly improved,and the improvement of Raw,mPaw,plateau pressure,PIP and other indexes in the combined group after communication and collaboration with the nursing team was significantly better than that in the single care group(P<0.05).The serum CRP and PCT levels of patients were significantly decreased,and the difference was statistically significant compared with that of nursing group alone(P<0.05).The levels of serum COR and HMGB1 before and after treatment were also significantly decreased between the two groups.CONCLUSION The communication and collaboration of the nursing team have a significant positive impact on respiratory mechanics indicators,blood gas analysis indicators and serum inflammatory factor levels in the treatment of severe pneumonia patients in ICU.
基金supported by the National Natural Science Foundation of China (Grant Nos.12172074,and 12150001)Liaoning Key Science and Innovation Program (Grant No.2024JH1/11700046)。
文摘A geometrically characteristic and thermodynamically consistent theory is proposed to describe the full-life mechanics of metallic solids undergoing large deformation.The theory is geometrically characteristic in the sense that the inelastic deformation caused by various crystalline defects is decomposed into a deviatoric part,a volumetric part,and a geometrically insensitive part,and the system thermodynamics is then formulated.The theory reaches its closure by including a finite-strain plastic flow rule originating from the postulate of maximum dissipation,and a set of thermodynamically consistent kinetic equations for the geometrically characteristic field quantities.The present theory is distinguished from existing ductile damage models in the following aspects.Firstly,the proposed geometrically characteristic measure of plasticity is conceptually valid throughout the whole deformation stage,enabling the calibration of the present theory simply against uniaxial loading data.Secondly,the stress calculation here is shown to be unconditionally convergent,and this is in contrast to the use of incremental tangent stiffness matrices whose eigenvalues inevitably turn negative in the softening stage.Thirdly,the anisotropic hardening behaviour can be modelled with low calibration requirements.
