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《汽车维修与保养》 2002年第12期12-12,共1页
一位客户开着1992年产Chevy S—10 Blazer车(车辆识别代码:W,4.3L发动机)到我们维修站检修。该车行驶里程约12万km,故障症状为启动困难。该客户说,有时发动机启动困难,有时他必须打开点火器并保持曲轴运转数秒后方能启动发动机。我猜想... 一位客户开着1992年产Chevy S—10 Blazer车(车辆识别代码:W,4.3L发动机)到我们维修站检修。该车行驶里程约12万km,故障症状为启动困难。该客户说,有时发动机启动困难,有时他必须打开点火器并保持曲轴运转数秒后方能启动发动机。我猜想难以启动发动机正是驱使他急于维修的真实原因。 基于先前对这种车辆中央多点燃油喷射系统(CMFI)的维修经验,我拆下发动机上进气歧管,同时发现下进气歧管粘满了燃油污垢。在更换一只新CMFI单元及分电器盖、马达、火花塞、火花塞导线、PCV阀、空气及燃油过滤器和清洗线性EGR阀等之后,该故障并没有得到排除。 燃油泵的正常压力应该是55~61psi(1psi=6.89kPa)。考虑到该发动机燃油泵的压力(54psi)已经低于正常压力,于是我按照制造商维修公告(TSB 56—63—05A)的建议更换了燃油泵及燃油泵继电器。同时我还按照维修公告TSB 99—06—01—022及TSB 57—01—02的建议清洗了燃油喷射系统。然而,还是与事无补! 我决定接着检查接地线路。我拆下动力制动增压器以便触及左列汽缸缸盖的后部及清洁位于该处的接地连接。我还发现并清洁了其它八个接地连接。接着安装燃油压力测试仪。当打开点火开关时,该测试仪的读数十有九次都是60psi,此时该车能够立即启动并运转良好。 展开更多
关键词 CMFI系统 汽车维修 故障分析 多点燃油喷射系统 发动机
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Next-generation craniomaxillofacial implants for reconstructive surgery: balancing biomechanics,biocompatibility,and bioactivity
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作者 Bozhi Hou Yuehua Li Raymond Chung Wen Wong 《International Journal of Oral Science》 2026年第1期1-17,共17页
Next-generation craniomaxillofacial implants(CMFIs) are redefining personalized bone reconstruction by balancing and optimizing biomechanics,biocompatibility,and bioactivity—the "3Bs".This review highlights... Next-generation craniomaxillofacial implants(CMFIs) are redefining personalized bone reconstruction by balancing and optimizing biomechanics,biocompatibility,and bioactivity—the "3Bs".This review highlights recent progress in implant design,material development,additive manufacturing,and preclinical evaluation.Emerging biomaterials,including bioresorbable polymers,magnesium alloys,and composites with bioactive ceramics,enable patient-specific solutions with improved safety and functionality.Triply periodic minimal surface(TPMS) architectures exemplify how structural design can enhance both mechanical performance and biological integration.Additive manufacturing technologies further allow the fabrication of geometrically complex,customized impla nts that meet individual anatomical and pathological needs.In parallel,multiscale evaluation techniques—from mechanical testing to in vitro and in vivo models—provide comprehensive insights into implant performance and safety.Looking ahead,the field is poised to benefit from several transformative trends:the development of smart and multifunctional biomaterials;Al-driven design frameworks that leverage patient-specific data and computational modeling;predictive additive manufacturing with real-time quality control;and advanced biological testing platforms for preclinical evaluation.Together,these advances form the foundation of a data-informed,translational pipeline from bench to bedside.Realizing the full potential of nextgene ration CMFIs will require close interdisciplina ry collaboration across mate rials science,computational engineering,and clinical medicine. 展开更多
关键词 bioresorbable polymersmagnesium alloysand biocompatibility next generation craniomaxillofacial implants craniomaxillofacial implants cmfis periodic mini balancing optimizing biomechanics bioactive ceramicsenable
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