目的 探究导乐陪伴分娩对初产妇自然分娩产程时间及产后生活质量的影响。方法 选取的80例产妇均为厦门市中医院2020年2月—2021年2月所收治,以随机数字表法将其分为观察组(导乐陪伴分娩)与对照组(常规护理)各40例,探讨实施不同护理对产...目的 探究导乐陪伴分娩对初产妇自然分娩产程时间及产后生活质量的影响。方法 选取的80例产妇均为厦门市中医院2020年2月—2021年2月所收治,以随机数字表法将其分为观察组(导乐陪伴分娩)与对照组(常规护理)各40例,探讨实施不同护理对产程时间及产后生活质量的影响。结果 观察组第一产程时间(339.50±33.11)min、第二产程时间(18.73±1.85)min、第三产程时间(9.75±0.95)min及总产程时间(371.98±37.92)min均比对照组[(373.25±37.89)min、(26.89±2.52)min、(12.25±1.51)min、(412.30±41.86)min]短,差异有统计学意义(P <0.05);两组在镇痛前以及镇痛后15 min VAS得分对比,差异无统计学意义(P>0.05)。观察组在宫颈扩张7~8 cm时VAS得分(3.40±1.12)分显著低于对照组(5.06±1.30)分,差异有统计学意义(P <0.05);观察组产妇出院后8周、16周女性性功能指数量表(female sexual function index,FSFI)评分[(24.82±2.73)分、(25.73±2.52)分]显著高于对照组[(20.45±2.69)分、(21.89±2.86)分],差异有统计学意义(P <0.05);观察组产妇出院后8周、16周性苦恼量表(female sexual distress scale,FSDS-R)评分[(26.75±2.67)分、(22.07±1.37)分]低于对照组[(29.58±2.92)分、(26.12±1.51)分],差异有统计学意义(P <0.05)。结论 对自然分娩的初产妇采取导乐陪伴分娩后,可显著缩短产程时间,改善产后生活质量,此方法值得应用与推广。展开更多
Existing Metal Additive Manufacturing processes are fast approaching a matured stage in which a wide range of possibilities are available for the incorporation of the rapid fabrication technology to current industrial...Existing Metal Additive Manufacturing processes are fast approaching a matured stage in which a wide range of possibilities are available for the incorporation of the rapid fabrication technology to current industrial practices. In terms of design conventions, the limitless geometrical freedom allows complex structures including cellular internal grids and lattices to be formed without additional tooling. Repair parts and leveraging components can also be produced on demand when required especially for military assets where large volume of inventory is constantly maintained to ensure operational readiness. In this exemplary work, a feasibility study on using stainless steel material with integrated cellular design to manufacture a guide bracket found on a military vehicle via Selective Laser Melting process was conducted. The results showed appreciably better mechanical performance in using a stainless steel honeycomb as compared to the aluminum alloy used for the original component together with a faster production route through SLM.展开更多
Laser powder bed fusion(LPBF),like many other additive manufacturing techniques,offers flexibility in design expected to become a disruption to the manufacturing industry.The current cost of LPBF process does not favo...Laser powder bed fusion(LPBF),like many other additive manufacturing techniques,offers flexibility in design expected to become a disruption to the manufacturing industry.The current cost of LPBF process does not favor a try-anderror way of research,which makes modelling and simulation a field of superior importance in that area of engineering.In this work,various methods used to overcome challenges in modeling at different levels of approximation of LPBF process are reviewed.Recent efforts made towards a reliable and computationally effective model to simulate LPBF process using finite element(FE)codes are presented.A combination of ray-tracing technique,the solution of the radiation transfer equation and absorption measurements has been used to establish an analytical equation,which gives a more accurate approximation of laser energy deposition in powder-substrate configuration.When this new analytical energy deposition model is used in in FE simulation,with other physics carefully set,it enables us to get reliable cooling curves and melt track morphology that agree well with experimental observations.The use of more computationally effective approximation,without explicit topological changes,allows to simulate wider geometries and longer scanning time leading to many applications in real engineering world.Different applications are herein presented including:prediction of printing quality through the simulated overlapping of consecutive melt tracks,simulation of LPBF of a mixture of materials and estimation of martensite inclusion in printed steel.展开更多
文摘目的 探究导乐陪伴分娩对初产妇自然分娩产程时间及产后生活质量的影响。方法 选取的80例产妇均为厦门市中医院2020年2月—2021年2月所收治,以随机数字表法将其分为观察组(导乐陪伴分娩)与对照组(常规护理)各40例,探讨实施不同护理对产程时间及产后生活质量的影响。结果 观察组第一产程时间(339.50±33.11)min、第二产程时间(18.73±1.85)min、第三产程时间(9.75±0.95)min及总产程时间(371.98±37.92)min均比对照组[(373.25±37.89)min、(26.89±2.52)min、(12.25±1.51)min、(412.30±41.86)min]短,差异有统计学意义(P <0.05);两组在镇痛前以及镇痛后15 min VAS得分对比,差异无统计学意义(P>0.05)。观察组在宫颈扩张7~8 cm时VAS得分(3.40±1.12)分显著低于对照组(5.06±1.30)分,差异有统计学意义(P <0.05);观察组产妇出院后8周、16周女性性功能指数量表(female sexual function index,FSFI)评分[(24.82±2.73)分、(25.73±2.52)分]显著高于对照组[(20.45±2.69)分、(21.89±2.86)分],差异有统计学意义(P <0.05);观察组产妇出院后8周、16周性苦恼量表(female sexual distress scale,FSDS-R)评分[(26.75±2.67)分、(22.07±1.37)分]低于对照组[(29.58±2.92)分、(26.12±1.51)分],差异有统计学意义(P <0.05)。结论 对自然分娩的初产妇采取导乐陪伴分娩后,可显著缩短产程时间,改善产后生活质量,此方法值得应用与推广。
文摘Existing Metal Additive Manufacturing processes are fast approaching a matured stage in which a wide range of possibilities are available for the incorporation of the rapid fabrication technology to current industrial practices. In terms of design conventions, the limitless geometrical freedom allows complex structures including cellular internal grids and lattices to be formed without additional tooling. Repair parts and leveraging components can also be produced on demand when required especially for military assets where large volume of inventory is constantly maintained to ensure operational readiness. In this exemplary work, a feasibility study on using stainless steel material with integrated cellular design to manufacture a guide bracket found on a military vehicle via Selective Laser Melting process was conducted. The results showed appreciably better mechanical performance in using a stainless steel honeycomb as compared to the aluminum alloy used for the original component together with a faster production route through SLM.
基金Project supported by Singapore Maritime Institute and the Advanced Material&Manufacturing R&D Program(Grant Nos.SMI-2016-OF-04 and R261502032592)。
文摘Laser powder bed fusion(LPBF),like many other additive manufacturing techniques,offers flexibility in design expected to become a disruption to the manufacturing industry.The current cost of LPBF process does not favor a try-anderror way of research,which makes modelling and simulation a field of superior importance in that area of engineering.In this work,various methods used to overcome challenges in modeling at different levels of approximation of LPBF process are reviewed.Recent efforts made towards a reliable and computationally effective model to simulate LPBF process using finite element(FE)codes are presented.A combination of ray-tracing technique,the solution of the radiation transfer equation and absorption measurements has been used to establish an analytical equation,which gives a more accurate approximation of laser energy deposition in powder-substrate configuration.When this new analytical energy deposition model is used in in FE simulation,with other physics carefully set,it enables us to get reliable cooling curves and melt track morphology that agree well with experimental observations.The use of more computationally effective approximation,without explicit topological changes,allows to simulate wider geometries and longer scanning time leading to many applications in real engineering world.Different applications are herein presented including:prediction of printing quality through the simulated overlapping of consecutive melt tracks,simulation of LPBF of a mixture of materials and estimation of martensite inclusion in printed steel.
基金supported by the Jiangsu Province Industry–University–Research Project,China(No.BY20221160)the Postgraduate Research and Practice Innovation Program of Jiangsu Province,China(No.KYCX22_3798)+2 种基金the National Natural Science Foundation of China(No.52275339)the Key Research and Development Plan of the Ministry of Science and Technology,China(No.2023YFE0200400)the Science and Technology Project of Jiangsu Province,China(No.BZ2021053)。
