Steel-concrete composite structures(SCCS)have been widely used as primary load-bearing components in large-scale civil infrastructures.As the basis of the co-working ability of steel plate and concrete,the bonding sta...Steel-concrete composite structures(SCCS)have been widely used as primary load-bearing components in large-scale civil infrastructures.As the basis of the co-working ability of steel plate and concrete,the bonding status plays an essential role in guaranteeing the structural performance of SCCS.Accordingly,efficient non-destructive testing(NDT)on interfacial debondings in SCCS has become a prominent research area.Multi-channel analysis of surface waves(MASW)has been validated as an effective NDT technique for interfacial debonding detection for SCCS.However,the feasibility of MASW must be validated using experimental measurements.This study establishes a high-frequency data synchronous acquisition system with 32 channels to perform comparative verification experiments in depth.First,the current sensing approaches for high-frequency vibration and stress waves are summarized.Secondly,three types of contact sensors,namely,piezoelectric lead-zirconate-titanate(PZT)patches,accelerometers,and ultrasonic transducers,are selected for MASW measurement.Then,the selection and optimization of the force hammer head are performed.Comparative experiments are carried out for the optimal selection of ultrasonic transducers,PZT patches,and accelerometers for MASW measurement.In addition,the influence of different pasting methods on the output signal of the sensor array is discussed.Experimental results indicate that optimized PZT patches,acceleration sensors,and ultrasonic transducers can provide efficient data acquisition for MASW-based non-destructive experiments.The research findings in this study lay a solid foundation for analyzing the recognition accuracy of contact MASW measurement using different sensor arrays.展开更多
2015年11月6-8日,学生保护科学大会（Student Conference on Conservation Sciences,SCCS）北京分会在北京大学召开.SCCS由英国剑桥大学于2000年创立,是世界上为数不多的以学生和年轻人为主角的保护科学年会.首次SCCS会议在剑桥大学举行...2015年11月6-8日,学生保护科学大会（Student Conference on Conservation Sciences,SCCS）北京分会在北京大学召开.SCCS由英国剑桥大学于2000年创立,是世界上为数不多的以学生和年轻人为主角的保护科学年会.首次SCCS会议在剑桥大学举行,目前已经发展了北京、班加罗尔、纽约和布里斯班4个分会场.展开更多
The Chinese government promotes smoking cessation through smoking cessation clinics(SCCs).This study aimed to identify factors associated with relapse and provide evidence to inform interventions that reduce relapse r...The Chinese government promotes smoking cessation through smoking cessation clinics(SCCs).This study aimed to identify factors associated with relapse and provide evidence to inform interventions that reduce relapse risk.Participants were SCC patients aged≥18 years who enrolled between June 2019 and December 2021,completed follow-up assessments at one and three months,and reported abstinence at one month.Short-term relapse was defined as self-reported smoking at the three-month follow-up.Treatments included counseling,first-line cessation medications,and traditional Chinese medicine(TCM).Logistic regression was used to identify factors associated with short-term relapse.Among 10,724 eligible SCC patients,11.6%experienced short-term relapse.Factors positively associated with relapse included the number of previous quit attempts(1–5 attempts:OR=1.422,95%CI:1.254–1.613,>5 attempts:OR=1.382,95%CI:1.057–1.808),high perceived difficulty in quitting(OR=1.297,95%CI:1.061–1.586),and moderate(OR=1.383,95%CI:1.174–1.629)or weak(OR=1.517,95%CI:1.251–1.841)willingness to quit.Factors negatively associated with relapse included having a college degree or higher(OR=0.796;95%CI:0.650–0.973),high confidence in quitting(OR=0.786;95%CI:0.629–0.983),and use of TCM(OR=0.276;95%CI:0.158–0.482).Enhancing self-efficacy in quitting appears crucial for preventing short-term relapse.The use of TCM may reduce relapse risk and warrants further investigation.展开更多
唇癌是一种影响口腔颌面部外观和功能的非常见肿瘤,90%以上发生在下唇。唇癌的首选治疗方法是手术切除。然而,使用扇形皮瓣修复唇癌术后缺损的方法很难统一且难以掌握。本研究选择了2008年1月至2023年12月在我院口腔颌面外科治疗的16例...唇癌是一种影响口腔颌面部外观和功能的非常见肿瘤,90%以上发生在下唇。唇癌的首选治疗方法是手术切除。然而,使用扇形皮瓣修复唇癌术后缺损的方法很难统一且难以掌握。本研究选择了2008年1月至2023年12月在我院口腔颌面外科治疗的16例下唇鳞状细胞癌患者。所有患者均接受了根治性肿瘤切除术,并采用改良双侧扇形瓣重建缺损。所有患者出院时均有较为严重的张口受限,有2名患者在为期两年的随访期间因自觉张口受限影响日常生活而接受了小口畸形开大手术,其余患者均恢复至中度或轻度张口受限,所有患者均获得了满意的功能及美观疗效。因此,本研究采用的改良双侧扇形瓣修复下唇鳞状细胞癌切除术后缺损能最大限度地修复唇部的美学和功能,是一种在精确算法下可靠的手术方法。但这种改良皮瓣的疗效和适应证还需要更多的数据来验证,以最大限度地改善术后口腔的美观和功能。Lip cancer is a rare tumor that affects the appearance and function of the oral and maxillofacial region, with over 90% of cases occurring on the lower lip. The preferred treatment for lip cancer is surgical resection. However, the method of using fan-shaped flaps to repair the postoperative defect of lip cancer is difficult to standardize and master. This study selected 16 patients with squamous cell carcinoma of the lower lip who were treated in the Department of Oral and Maxillofacial Surgery of our hospital from January 2008 to December 2023. All patients underwent radical tumor resection, and the defect was reconstructed using an improved bilateral fan-shaped flap. All patients had severe trismus at discharge. 2 patients underwent microstomia dilation surgery during the two-year follow-up period due to self-perceived limited mouth opening that affected their daily life, the remaining patients recovered to moderate or mild trismus. All patients achieved satisfactory functional and aesthetic outcomes. Therefore, the improved bilateral fan-shaped flap used in this study to repair the defect after resection of squamous cell carcinoma of the lower lip can restore the aesthetics and function of the lip to the greatest extent and is a reliable surgical method under precise algorithm. However, the efficacy and indications of this improved flap still require more data for verification to maximize the improvement of postoperative oral aesthetics and function.展开更多
基金National Natural Science Foundation of China under Grant (Nos.52192662,52020105005,51908320)the Beijing Nova Program under Grant No.20220484012+1 种基金the Interdisciplinary Research Project for Young Teachers of USTB (Fundamental Research Funds for the Central Universities,FRF-IDRY-22-013)the Key Laboratory for Intelligent Infrastructure and Monitoring of Fujian Province (Huaqiao University,IIM-01-05)。
文摘Steel-concrete composite structures(SCCS)have been widely used as primary load-bearing components in large-scale civil infrastructures.As the basis of the co-working ability of steel plate and concrete,the bonding status plays an essential role in guaranteeing the structural performance of SCCS.Accordingly,efficient non-destructive testing(NDT)on interfacial debondings in SCCS has become a prominent research area.Multi-channel analysis of surface waves(MASW)has been validated as an effective NDT technique for interfacial debonding detection for SCCS.However,the feasibility of MASW must be validated using experimental measurements.This study establishes a high-frequency data synchronous acquisition system with 32 channels to perform comparative verification experiments in depth.First,the current sensing approaches for high-frequency vibration and stress waves are summarized.Secondly,three types of contact sensors,namely,piezoelectric lead-zirconate-titanate(PZT)patches,accelerometers,and ultrasonic transducers,are selected for MASW measurement.Then,the selection and optimization of the force hammer head are performed.Comparative experiments are carried out for the optimal selection of ultrasonic transducers,PZT patches,and accelerometers for MASW measurement.In addition,the influence of different pasting methods on the output signal of the sensor array is discussed.Experimental results indicate that optimized PZT patches,acceleration sensors,and ultrasonic transducers can provide efficient data acquisition for MASW-based non-destructive experiments.The research findings in this study lay a solid foundation for analyzing the recognition accuracy of contact MASW measurement using different sensor arrays.
文摘2015年11月6-8日,学生保护科学大会（Student Conference on Conservation Sciences,SCCS）北京分会在北京大学召开.SCCS由英国剑桥大学于2000年创立,是世界上为数不多的以学生和年轻人为主角的保护科学年会.首次SCCS会议在剑桥大学举行,目前已经发展了北京、班加罗尔、纽约和布里斯班4个分会场.
文摘The Chinese government promotes smoking cessation through smoking cessation clinics(SCCs).This study aimed to identify factors associated with relapse and provide evidence to inform interventions that reduce relapse risk.Participants were SCC patients aged≥18 years who enrolled between June 2019 and December 2021,completed follow-up assessments at one and three months,and reported abstinence at one month.Short-term relapse was defined as self-reported smoking at the three-month follow-up.Treatments included counseling,first-line cessation medications,and traditional Chinese medicine(TCM).Logistic regression was used to identify factors associated with short-term relapse.Among 10,724 eligible SCC patients,11.6%experienced short-term relapse.Factors positively associated with relapse included the number of previous quit attempts(1–5 attempts:OR=1.422,95%CI:1.254–1.613,>5 attempts:OR=1.382,95%CI:1.057–1.808),high perceived difficulty in quitting(OR=1.297,95%CI:1.061–1.586),and moderate(OR=1.383,95%CI:1.174–1.629)or weak(OR=1.517,95%CI:1.251–1.841)willingness to quit.Factors negatively associated with relapse included having a college degree or higher(OR=0.796;95%CI:0.650–0.973),high confidence in quitting(OR=0.786;95%CI:0.629–0.983),and use of TCM(OR=0.276;95%CI:0.158–0.482).Enhancing self-efficacy in quitting appears crucial for preventing short-term relapse.The use of TCM may reduce relapse risk and warrants further investigation.
文摘唇癌是一种影响口腔颌面部外观和功能的非常见肿瘤,90%以上发生在下唇。唇癌的首选治疗方法是手术切除。然而,使用扇形皮瓣修复唇癌术后缺损的方法很难统一且难以掌握。本研究选择了2008年1月至2023年12月在我院口腔颌面外科治疗的16例下唇鳞状细胞癌患者。所有患者均接受了根治性肿瘤切除术,并采用改良双侧扇形瓣重建缺损。所有患者出院时均有较为严重的张口受限,有2名患者在为期两年的随访期间因自觉张口受限影响日常生活而接受了小口畸形开大手术,其余患者均恢复至中度或轻度张口受限,所有患者均获得了满意的功能及美观疗效。因此,本研究采用的改良双侧扇形瓣修复下唇鳞状细胞癌切除术后缺损能最大限度地修复唇部的美学和功能,是一种在精确算法下可靠的手术方法。但这种改良皮瓣的疗效和适应证还需要更多的数据来验证,以最大限度地改善术后口腔的美观和功能。Lip cancer is a rare tumor that affects the appearance and function of the oral and maxillofacial region, with over 90% of cases occurring on the lower lip. The preferred treatment for lip cancer is surgical resection. However, the method of using fan-shaped flaps to repair the postoperative defect of lip cancer is difficult to standardize and master. This study selected 16 patients with squamous cell carcinoma of the lower lip who were treated in the Department of Oral and Maxillofacial Surgery of our hospital from January 2008 to December 2023. All patients underwent radical tumor resection, and the defect was reconstructed using an improved bilateral fan-shaped flap. All patients had severe trismus at discharge. 2 patients underwent microstomia dilation surgery during the two-year follow-up period due to self-perceived limited mouth opening that affected their daily life, the remaining patients recovered to moderate or mild trismus. All patients achieved satisfactory functional and aesthetic outcomes. Therefore, the improved bilateral fan-shaped flap used in this study to repair the defect after resection of squamous cell carcinoma of the lower lip can restore the aesthetics and function of the lip to the greatest extent and is a reliable surgical method under precise algorithm. However, the efficacy and indications of this improved flap still require more data for verification to maximize the improvement of postoperative oral aesthetics and function.
