The risk factors associated with strangulated ovarian hernia (SOH)in female patients (<1 year old)were identified.A retrospective analysis was conducted regarding the data from 2006 to 2017.The patients were divide...The risk factors associated with strangulated ovarian hernia (SOH)in female patients (<1 year old)were identified.A retrospective analysis was conducted regarding the data from 2006 to 2017.The patients were divided into 2groups:SOH group (n=9)and non-SOH group (n=23). Patient demographics,clinical signs,preoperative examinations and intraoperative findings were compared between the two groups,and risk factors for SOH were tested using a binary logistic regression model.To explore whether greater ovary was more likely to be twisted,leading to SOH, all the patients were divided into ovary volume <5cm^3 and ≥5cm^3 groups and the association between ovarian volume and ovary torsion was assessed.Among a total of 32 female patients (<1year old)with incarcerated ovarian herniation,9 patients developed SOH.The single variate analysis revealed that times of manual reduction,ovarian volume,ovary with or without multiple cysts,ovary torsion or not and angle of ovary torsion were found to be significant factors associated with SOH.The multivariate analysis showed ovarian volume was evidenced as an independent risk factor for SOH.Furthermore,the incidence of ovary torsion was significantly higher in ovarian volume ≥5cm^3 group than in ovarian volume <5cm^3 group,indicating that larger ovary was more likely to result in ovary torsion,leading to SOH.Our study demonstrated that the odds of SOH increased with increasing ovarian volume in female patients (<1 year old)because the relatively greater ovary at this age was more likely to be incarcerated and twisted,leading to SOH.展开更多
Two kinds of CoCrNi composite coatings,CoCrNiMo and CoCrNiMoBC,were prepared by laser cladding on the base metal of 304 stainless steel.The wear and corrosion properties of the coatings were studied by wear tests and ...Two kinds of CoCrNi composite coatings,CoCrNiMo and CoCrNiMoBC,were prepared by laser cladding on the base metal of 304 stainless steel.The wear and corrosion properties of the coatings were studied by wear tests and electrochemical tests.Results show that the addition of B_(4)C promotes the generation of the ceramic phase,and therefore improving the microhardness of the coating and enhancing its wear resistance,while simutaneously keeps its excellent corrosion resistance.Energy dispersive X-ray spectrometry analysis shows that the chromium distribution in the two coatings is relatively uniform,which is beneficial for corrosion resistance.Scanning Kelvin probe microscopy results reveal that the potential difference between dendrites and interdendrites is only 20 mV,which leads to a relatively low driving force for galvanic corrosion.Observation through the atomic-scale high-resolution transmission electron microscopy shows that the fundamental reason for the high wear and corrosion resistance of the coating is the excellent coherent interface between the two phases,which reduces the interface energy and potential difference and thus improving its corrosion resistance.展开更多
Porous Zn2 Ti04-ZnO microtubes have been successfully fabricated using chemical precipitation followed by a calcination process using a carbon fiber template.The porous Zn_(2)TiO_(4)-ZnO micro tubes with a diameter o...Porous Zn2 Ti04-ZnO microtubes have been successfully fabricated using chemical precipitation followed by a calcination process using a carbon fiber template.The porous Zn_(2)TiO_(4)-ZnO micro tubes with a diameter of~4μm consisted of Zn_(2)TiO_(4) and ZnO nanoparticles.These displayed worm-like pore structures.Carbon fibers played an important role during the porous Zn_(2)TiO_(4)-ZnO microtube formation process.The porous and hollow structure of Zn_(2)TiO_(4)-ZnO provided abundant active sensing sites and channels for gas adsorption and diffusion.The porous Zn_(2)TiO_(4)-ZnO microtubes exhibited improved gas sensing properties for acetone when compared with pure ZnO.The Zn_(2)TiO_(4)-ZnO sensor response was 33.4 for 100μg·ml^(-1) acetone at the optimum operating temperature(370℃).This was~2.7 times higher than that of pure ZnO.Additionally,the as-prepared porous Zn_(2)TiO_(4)-ZnO microtubes displayed sufficient long-term acetone stability and selectivity.This showed the potential application for acetone detection.The enhanced Zn_(2)TiO_(4)-ZnO gas sensing properties are due to the unique heterogeneous and porous structure,which was analyzed using the porous and band structure.展开更多
Open-celled porous （TiB2-Al2O3）/NiAl composites were successfully fabricated by using spherical carbamide as space holders via self-propagating high-temperature synthesis （SHS）. Effects of 10Al-3B2O3-3TiO2 conten...Open-celled porous （TiB2-Al2O3）/NiAl composites were successfully fabricated by using spherical carbamide as space holders via self-propagating high-temperature synthesis （SHS）. Effects of 10Al-3B2O3-3TiO2 contents （0-20 wt%） on the pore structures and the quasi-static compressive behaviors of the resultant materials were investigated. The porous （TiBE-Al2O3）/NiAl composites exhibit composite pore structure consisting of homogeneously distributed and interconnected millimeter pores and micropores. The millimeter pores virtually inherit the shape and size of carbamide particles, while the pore size of micropores increases with increasing the 10Al-3BEO3-3TiO2 content. Depending on the volume fraction of the carbamide, the porosity of the porous materials can be easily controlled in a range of 55%-85%. When the porosity is about 72%, the compressive strengths of porous NiAl and porous （TiBE-Al203）/NiAl composite with 15% 10Al-3B2O3-3TiO2 in green compact are 19 and 32 MPa, and the corresponding strains are 2.9% and 5.7%, respectively. Furthermore, the quasi-static compressive behavior of porous （TiB2-AlEO3）/NiAl composites can be estimated by Gibson-Ashby model.展开更多
文摘The risk factors associated with strangulated ovarian hernia (SOH)in female patients (<1 year old)were identified.A retrospective analysis was conducted regarding the data from 2006 to 2017.The patients were divided into 2groups:SOH group (n=9)and non-SOH group (n=23). Patient demographics,clinical signs,preoperative examinations and intraoperative findings were compared between the two groups,and risk factors for SOH were tested using a binary logistic regression model.To explore whether greater ovary was more likely to be twisted,leading to SOH, all the patients were divided into ovary volume <5cm^3 and ≥5cm^3 groups and the association between ovarian volume and ovary torsion was assessed.Among a total of 32 female patients (<1year old)with incarcerated ovarian herniation,9 patients developed SOH.The single variate analysis revealed that times of manual reduction,ovarian volume,ovary with or without multiple cysts,ovary torsion or not and angle of ovary torsion were found to be significant factors associated with SOH.The multivariate analysis showed ovarian volume was evidenced as an independent risk factor for SOH.Furthermore,the incidence of ovary torsion was significantly higher in ovarian volume ≥5cm^3 group than in ovarian volume <5cm^3 group,indicating that larger ovary was more likely to result in ovary torsion,leading to SOH.Our study demonstrated that the odds of SOH increased with increasing ovarian volume in female patients (<1 year old)because the relatively greater ovary at this age was more likely to be incarcerated and twisted,leading to SOH.
基金support of the National Natural Science Foundation of China(No.51971121)the National Natural Science Foundation of China-Shandong Joint Fund for Marine Science Research Centers(CN)(No.U2106216)+1 种基金the Taishan Scholarship of Climbing Plan(No.tspd20161006)the Major Special Science and Technology Projects in Shandong Province(Nos.2019JZZY010303,2019JZZY010360).
文摘Two kinds of CoCrNi composite coatings,CoCrNiMo and CoCrNiMoBC,were prepared by laser cladding on the base metal of 304 stainless steel.The wear and corrosion properties of the coatings were studied by wear tests and electrochemical tests.Results show that the addition of B_(4)C promotes the generation of the ceramic phase,and therefore improving the microhardness of the coating and enhancing its wear resistance,while simutaneously keeps its excellent corrosion resistance.Energy dispersive X-ray spectrometry analysis shows that the chromium distribution in the two coatings is relatively uniform,which is beneficial for corrosion resistance.Scanning Kelvin probe microscopy results reveal that the potential difference between dendrites and interdendrites is only 20 mV,which leads to a relatively low driving force for galvanic corrosion.Observation through the atomic-scale high-resolution transmission electron microscopy shows that the fundamental reason for the high wear and corrosion resistance of the coating is the excellent coherent interface between the two phases,which reduces the interface energy and potential difference and thus improving its corrosion resistance.
基金financially supported by the Distinguished Taishan Scholars in Climbing Plan(No.tspd20161006)Shandong Provincial Natural Science Foundation(No.ZR2019MEM049)+1 种基金the National Natural Science Foundation of China(Nos.51772176 and 51971121)Shandong Province Key Laboratory of Mine Mechanical Engineering(No.2019KLMM101)。
文摘Porous Zn2 Ti04-ZnO microtubes have been successfully fabricated using chemical precipitation followed by a calcination process using a carbon fiber template.The porous Zn_(2)TiO_(4)-ZnO micro tubes with a diameter of~4μm consisted of Zn_(2)TiO_(4) and ZnO nanoparticles.These displayed worm-like pore structures.Carbon fibers played an important role during the porous Zn_(2)TiO_(4)-ZnO microtube formation process.The porous and hollow structure of Zn_(2)TiO_(4)-ZnO provided abundant active sensing sites and channels for gas adsorption and diffusion.The porous Zn_(2)TiO_(4)-ZnO microtubes exhibited improved gas sensing properties for acetone when compared with pure ZnO.The Zn_(2)TiO_(4)-ZnO sensor response was 33.4 for 100μg·ml^(-1) acetone at the optimum operating temperature(370℃).This was~2.7 times higher than that of pure ZnO.Additionally,the as-prepared porous Zn_(2)TiO_(4)-ZnO microtubes displayed sufficient long-term acetone stability and selectivity.This showed the potential application for acetone detection.The enhanced Zn_(2)TiO_(4)-ZnO gas sensing properties are due to the unique heterogeneous and porous structure,which was analyzed using the porous and band structure.
基金financially supported by the Natural Science Foundation of Shandong Province (No.ZR2014EMM009)the Public School Visiting Fund of Shandong University of Science and Technology
文摘Open-celled porous （TiB2-Al2O3）/NiAl composites were successfully fabricated by using spherical carbamide as space holders via self-propagating high-temperature synthesis （SHS）. Effects of 10Al-3B2O3-3TiO2 contents （0-20 wt%） on the pore structures and the quasi-static compressive behaviors of the resultant materials were investigated. The porous （TiBE-Al2O3）/NiAl composites exhibit composite pore structure consisting of homogeneously distributed and interconnected millimeter pores and micropores. The millimeter pores virtually inherit the shape and size of carbamide particles, while the pore size of micropores increases with increasing the 10Al-3BEO3-3TiO2 content. Depending on the volume fraction of the carbamide, the porosity of the porous materials can be easily controlled in a range of 55%-85%. When the porosity is about 72%, the compressive strengths of porous NiAl and porous （TiBE-Al203）/NiAl composite with 15% 10Al-3B2O3-3TiO2 in green compact are 19 and 32 MPa, and the corresponding strains are 2.9% and 5.7%, respectively. Furthermore, the quasi-static compressive behavior of porous （TiB2-AlEO3）/NiAl composites can be estimated by Gibson-Ashby model.
