目的对针刺治疗膝骨关节炎系统评价的方法学质量和证据质量进行再评价。方法通过计算机检索PubMed、Web of Science、Cochrane Library、Ovid、中国知识资源总库(CNKI)、中国学术期刊数据库(万方数据)、中文科技期刊数据库(维普网)自建...目的对针刺治疗膝骨关节炎系统评价的方法学质量和证据质量进行再评价。方法通过计算机检索PubMed、Web of Science、Cochrane Library、Ovid、中国知识资源总库(CNKI)、中国学术期刊数据库(万方数据)、中文科技期刊数据库(维普网)自建库至2020年4月16日针刺治疗膝骨关节炎的系统评价/Meta分析,筛选后提取相关信息,分别采用AMSTAR 2和GRADE系统评价纳入文献的方法学质量,并对结局指标进行证据质量分级。结果共纳入10篇系统评价/Meta分析文献,涉及23个结局指标。AMSTAR 2质量评价表明,10篇文献方法学质量均为极低,所有文献均未提前注册和报告研究计划(条目2)、未说明纳入研究类型的原因(条目3)、未提供排除文献的清单和理由(条目7);此外,研究者未重视资金来源和利益冲突对研究结果的影响(条目10、条目16)。23个指标中20个为低级或极低级证据,大多数指标因不精确性和存在发表偏倚而降级。结论目前,针刺治疗膝骨关节炎系统评价方法学和证据质量较低,难以科学指导临床应用和决策,尚需更高质量的循证证据。展开更多
Powder charges of micron-size Ni and Al2O3were utilized to deposit nano-structured Ni-Al2O3composite coatings on analuminum plate fixed at the top end of a milling vial using a planetary ball mill.Composite coatings w...Powder charges of micron-size Ni and Al2O3were utilized to deposit nano-structured Ni-Al2O3composite coatings on analuminum plate fixed at the top end of a milling vial using a planetary ball mill.Composite coatings were fabricated using powdermixtures with a wide range of Ni/Al2O3mass ratio varying from1:1to plain Ni.XRD,SEM and TEM techniques were employed tostudy the structural characteristics of the coatings.It was found that the composition of the starting mixture strongly affects the Al2O3content and the microstructure of the final coating.Mixtures containing higher contents of Al2O3yield higher volume fractions of theAl2O3particles in the coating.Though Ni-Al2O3composite coatings with about50%of Al2O3particles were successfully deposited,well-compacted and free of cracks and/or voids coatings included less than20%(volume fraction)of Al2O3particles which weredeposited from powder mixtures with Ni/Al2O3mass ratios of4:1or higher.Moreover,mechanical and metallurgical bondings arethe main mechanisms of the adhesion of the coating to the Al substrate.Finally,functionally graded composite coatings withnoticeable compaction and integrity were produced by deposition of two separate layers under identical coating conditions.展开更多
Objective:To evaluate the methodological quality of the systematic reviews(SRs)of acupuncture and moxibustion for chronic constipation and rate the evidence bodies of their Meta-analysis.Methods:We searched MEDLINE,EM...Objective:To evaluate the methodological quality of the systematic reviews(SRs)of acupuncture and moxibustion for chronic constipation and rate the evidence bodies of their Meta-analysis.Methods:We searched MEDLINE,EMBASE,Chinese Biomedical Literature Database(CBM),the China National Knowledge Infrastructure(CNKI),the VIP Database and the WanFang Database.Systematic Aseviews and Meta-analysis of all Randomized Controlled Trials(RCTs)of acupuncture and moxibustion for chronic constipation were included.Data from the included studies were extracted by two independent reviewers and were re-evaluated with AMSTAR 2 and Grades of Recommendation,Assessment,Development,and Evaluation(GRADE).Results:We included 12 SRs/Meta-analysis with only one conducted outside China.Evaluated with AMSTAR 2,methodology of one SR was of medium quality,methodologies of 7 SRs were of low quality,and methodologies of 4 SRs were of critical low quality.Among 54 outcome measures screened from included SRs,7 outcome measures introduced evidence bodies of moderate quality,22 outcome measures were of low quality and 25 outcome measures were of very low quality.No high level of quality was awarded to any evidence body.Conclusion:Overall,the quality level of SR/Meta-analysis of acupuncture/moxibustion for chronic constipation is low.The SRs/Meta-analysis of acupuncture/moxibustion for chronic constipation can be used for guideline formulation and clinical decision making by taking into account the experience of clinical experts,patients'preference,medical policies and other factors.展开更多
One of the challenges for bimetal manufacturing is the joining process.Hence,transient liquid phase(TLP)bonding was performed between 304L stainless steel and Cp-Ti using an Ag-Cu interlayer with a thickness of 75μm ...One of the challenges for bimetal manufacturing is the joining process.Hence,transient liquid phase(TLP)bonding was performed between 304L stainless steel and Cp-Ti using an Ag-Cu interlayer with a thickness of 75μm for bonding time of 20,40,60,and 90 min.The bonding temperature of 860℃ was considered,which is under the β transus temperature of Cp-Ti.During TLP bonding,various intermetallic compounds(IMCs),including Ti_(5)Cr_(7)Fe_(17),(Cr,Fe)_(2)Ti,Ti(Cu,Fe),Ti_(2)(Cu,Ag),and Ti_(2)Cu from 304L toward Cp-Ti formed in the joint.Also,on the one side,with the increase in time,further diffusion of elements decreases the blocky IMCs such as Ti_(5)Cr_(7)Fe_(17),(Cr,Fe)_(2)Ti,Ti(Cu,Fe)in the 304L diffusion-affected zone(DAZ)and reaction zone,and on the other side,Ti_(2)(Cu,Ag)IMC transformed into fine morphology toward Cp-Ti DAZ.The microhardness test also demonstrated that the(Cr,Fe)_(2)Ti+Ti_(5)Cr_(7)Fe_(17) IMCs in the DAZ on the side of 304L have a hardness value of HV 564,making it the hardest phase.The maximum and minimum shear strength values are equal to 78.84 and 29.0 MPa,respectively.The cleavage pattern dominated fracture surfaces due to the formation of brittle phases in dissimilar joints.展开更多
文摘Powder charges of micron-size Ni and Al2O3were utilized to deposit nano-structured Ni-Al2O3composite coatings on analuminum plate fixed at the top end of a milling vial using a planetary ball mill.Composite coatings were fabricated using powdermixtures with a wide range of Ni/Al2O3mass ratio varying from1:1to plain Ni.XRD,SEM and TEM techniques were employed tostudy the structural characteristics of the coatings.It was found that the composition of the starting mixture strongly affects the Al2O3content and the microstructure of the final coating.Mixtures containing higher contents of Al2O3yield higher volume fractions of theAl2O3particles in the coating.Though Ni-Al2O3composite coatings with about50%of Al2O3particles were successfully deposited,well-compacted and free of cracks and/or voids coatings included less than20%(volume fraction)of Al2O3particles which weredeposited from powder mixtures with Ni/Al2O3mass ratios of4:1or higher.Moreover,mechanical and metallurgical bondings arethe main mechanisms of the adhesion of the coating to the Al substrate.Finally,functionally graded composite coatings withnoticeable compaction and integrity were produced by deposition of two separate layers under identical coating conditions.
基金Ministry of Science and Technology of the People's Republic of China,"Development of International Clinical Practice Guideline,Technical Operation Standard and Service Standard of Acupuncture and Moxibustion".Granting number:2019YFC1712200。
文摘Objective:To evaluate the methodological quality of the systematic reviews(SRs)of acupuncture and moxibustion for chronic constipation and rate the evidence bodies of their Meta-analysis.Methods:We searched MEDLINE,EMBASE,Chinese Biomedical Literature Database(CBM),the China National Knowledge Infrastructure(CNKI),the VIP Database and the WanFang Database.Systematic Aseviews and Meta-analysis of all Randomized Controlled Trials(RCTs)of acupuncture and moxibustion for chronic constipation were included.Data from the included studies were extracted by two independent reviewers and were re-evaluated with AMSTAR 2 and Grades of Recommendation,Assessment,Development,and Evaluation(GRADE).Results:We included 12 SRs/Meta-analysis with only one conducted outside China.Evaluated with AMSTAR 2,methodology of one SR was of medium quality,methodologies of 7 SRs were of low quality,and methodologies of 4 SRs were of critical low quality.Among 54 outcome measures screened from included SRs,7 outcome measures introduced evidence bodies of moderate quality,22 outcome measures were of low quality and 25 outcome measures were of very low quality.No high level of quality was awarded to any evidence body.Conclusion:Overall,the quality level of SR/Meta-analysis of acupuncture/moxibustion for chronic constipation is low.The SRs/Meta-analysis of acupuncture/moxibustion for chronic constipation can be used for guideline formulation and clinical decision making by taking into account the experience of clinical experts,patients'preference,medical policies and other factors.
文摘One of the challenges for bimetal manufacturing is the joining process.Hence,transient liquid phase(TLP)bonding was performed between 304L stainless steel and Cp-Ti using an Ag-Cu interlayer with a thickness of 75μm for bonding time of 20,40,60,and 90 min.The bonding temperature of 860℃ was considered,which is under the β transus temperature of Cp-Ti.During TLP bonding,various intermetallic compounds(IMCs),including Ti_(5)Cr_(7)Fe_(17),(Cr,Fe)_(2)Ti,Ti(Cu,Fe),Ti_(2)(Cu,Ag),and Ti_(2)Cu from 304L toward Cp-Ti formed in the joint.Also,on the one side,with the increase in time,further diffusion of elements decreases the blocky IMCs such as Ti_(5)Cr_(7)Fe_(17),(Cr,Fe)_(2)Ti,Ti(Cu,Fe)in the 304L diffusion-affected zone(DAZ)and reaction zone,and on the other side,Ti_(2)(Cu,Ag)IMC transformed into fine morphology toward Cp-Ti DAZ.The microhardness test also demonstrated that the(Cr,Fe)_(2)Ti+Ti_(5)Cr_(7)Fe_(17) IMCs in the DAZ on the side of 304L have a hardness value of HV 564,making it the hardest phase.The maximum and minimum shear strength values are equal to 78.84 and 29.0 MPa,respectively.The cleavage pattern dominated fracture surfaces due to the formation of brittle phases in dissimilar joints.
