检索结果-南通市图书馆

Novel method of improving the alignment accuracy of SINS on revolving mounting base

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2009年第5期20卷 1052-1057页

作者： Qian weixing Liu Jianye zhao wei zhu Yanhua Navigation Research Center Nanjing Univ. of Aeronautics ~z Astronautics Nanjing 210016 P. R. China

In the process of initial alignment for a strapdown inertial navigation system （SINS） on a stationary base, the east gyro drift rate is an important factor affecting the alignment accuracy of the azimuth misalignment angle. When the Kalman filtering algorithm is adopted in initial alignment, it yields a constant error in the estimation of the azimuth misalignment angle because the east gyro drift rate cannot be estimated. To improve the alignment accuracy, a novel alignment method on revolving mounting base is proposed. The Kalman filtering algorithm of extending the measured values is studied. The theory of spectral condition number is utilized to analyze the degrees of observability of states. Simulation results show that the estimation accuracy of the azimuth misalignment angle is greatly improved through revolving mounting base, and the proposed method is efficient in initial alignment for a medium accurate SINS.

关键词： inertial navigation initial alignment observability analysis Kalman filter spectral condition number.

Evaluation of sensory function and recovery after replantation of fingertips at ZoneⅠin children

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2017年第11期12卷 1911-1917页

作者： zhao-wei zhu Xiao-yan Zou Yong-jun Huang Jiang-hui Liu Xi-jun Huang Bo He Zeng-tao Wang Department of Plastic Surgery the First Affiliated Hospital of Sun Yat-sen University Guangzhou Guangdong ProvinceChina Department of Orthopedics and Microsurgery the First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Department of Neurology the First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Department of Orthopedics Guangdong Second Provincial General HospitalGuangzhouGuangdong ProvinceChina Department of Emergency the First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Department of Hand and Foot Surgery Provincial Hospital Affiliated to Shandong UniversitylinanShandong ProvinceChina

Sensory function is the most significant criterion when evaluating the prognosis of replanted fingers. Current clinical research has focused on surgical techniques and indications for finger replantation; however, few studies have focused on recovery of finger sensory function af- ter replantation. This study retrospectively assessed data of eight patients who had undergone nine Zone I replantations of the fingertips in the First Affiliated Hospital of Sun Yat-sen University of China from July 2014 to January 2016. Variations in the extent of damage, with the residual vessels or nerves in some fingers being too short or even missing, prevented tension-free suture repair in some patients. Thus, re- pair of four of the nine fingertips included arteriovenous anastomosis, the remaining five undergoing arterial anastomosis during replanta- tion of the amputated fingers. Three patients underwent nerve repair, whereas the remaining six cases did not. Fingertip replantations were successful in all eight patients. Compared with the patients without vascular anastomosis, no obvious atrophy was visible in the fingertips of patients who did undergo vascular anastomosis during replantation and their sensory function did recover. Fingertip replantation pro- vides good sensory function and cosmetic outcomes when good artery and vein anastomoses have been created, even when digital nerves have not been repaired.

关键词： nerve regeneration fingertip replantation neurological function microsurgery hand surgery anatomy plastic surgery blood vessels neural regeneration

Analysis of transcriptome sequencing of sciatic nerves in Sprague-Dawley rats of different ages

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2018年第12期13卷 2182-2190页

作者： Jiang-Hui Liu Qing Tang Xiang-Xia Liu Jian Qi Rui-Xi Zeng zhao-wei zhu Bo He Yang-Bin Xu Department of Emergency First Affiliated Hospital of Sun Yat-sen University Department of Plastic Surgery First Affiliated Hospital of Sun Yat-sen University Department of Orthopedics and Microsurgery First Affiliated Hospital of Sun Yat-sen University Department of Orthopedics Third Affiliated Hospital of Sun Yat-sen University

An aging-induced decrease in Schwann cell viability can affect regeneration following peripheral nerve injury in mammals. It is therefore necessary to investigate possible age-related changes in gene expression that may affect the biological function of peripheral nerves. Ten 1-week-old and ten 12-month-old healthy male Sprague-Dawley rats were divided into young（1 week old） and adult（12 months old） groups according to their ages. mRNA expression in the sciatic nerve was compared between young and adult rats using next-generation sequencing（NGS） and bioinformatics（n = 4/group）. The 18 groups of differentially expressed mRNA（DEmRNAs） were also tested by quantitative reverse transcription polymerase chain reaction（n = 6/group）. Results revealed that（1） compared with young rats, adult rats had 3608 groups of DEmRNAs. Of these, 2684 were groups of upregulated genes, and 924 were groups of downregulated genes. Their functions mainly involved cell viability, proliferation, differentiation, regeneration, and myelination.（2） The gene with the most obvious increase of all DEmRNAs in adult rats was Thrsp（log2 FC = 9.01, P 〈 0.05）, and the gene with the most obvious reduction was Col2 a1（log2 FC = -8.89, P 〈 0.05）.（3） Gene Ontology analysis showed that DEmRNAs were mainly concentrated in oligosaccharide binding, nucleotide-binding oligomerization domain containing one signaling pathway, and peptide-transporting ATPase activity.（4） Analysis using the Kyoto Encyclopedia of Genes and Genomes showed that, with increased age, DEmRNAs were mainly enriched in steroid biosynthesis, Staphylococcus aureus infection, and graft-versus-host disease.（5） Spearman＇s correlation coefficient method for evaluating NGS accuracy showed that the NGS results and quantitative reverse transcription polymerase chain reaction results were positively correlated（rs = 0.74, P 〈 0.05）. These findings confirm a difference in sciatic nerve gene expression between adult and young rats, suggesting that, in peri

关键词： peripheral nerve injury aging Sprague-Dawley rat transcriptome sequencing mRNA rat age Schwann cells neural regeneration

Various changes in cryopreserved acellular nerve allografts at-80°C

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2018年第9期13卷 1643-1649页

作者： Yan-Yan Huang Xiao-Lu Xu Xi-Jun Huang Jiang-Hui Liu Jian Qi Shuang zhu zhao-wei zhu Bo He Qing-Tang zhu Yang-Bin Xu Li-Qiang Gu Xiao-Lin Liu Department of Plastic Surgery The First Affiliated Hospital of Sun Yat-sen University Yale School of Medicine New HavenCT Department of Orthopedic and Microsurgery the First Affiliated Hospital of Sun Yat-sen University Department of Emergency the First Affiliated Hospital of Sun Yat-sen University Department of Joint and Orthopedic Orthopedic CenterZhujiang Hospital of Southern Medical University

The experimental design evaluated histological,mechanical,and biological properties of allogeneic decellularized nerves after cryopreservation in a multi-angle,multi-directional manner to provide evidence for long-term *** nerve allografts from human and rats were cryopreserved in a cryoprotectant（10% fetal bovine serum,10% dimethyl sulfoxide,and 5% sucrose in RPMI1640 medium） at-80°C for 1 year,followed by thawing at 40°C or 37°C for 8 *** breaking force of acellular nerve allografts was measured using a tensile *** survival was determined using L-929 cell *** nerve allografts were transplanted into a rat model with loss of a 15-mm segment of the left sciatic *** staining was used to measure neurofilament 200 ***-eosin staining was utilized to detect relative muscle area in gastrocnemius *** microscopy was applied to observe changes in allograft *** was no obvious change in morphological appearance or ultrastructure,breaking force,or cytotoxicity of human acellular nerve allografts after cryopreservation at-80°***,there was no remarkable change in neurofilament 200 expression,myelin sheath thickness,or muscle atrophy when fresh or cryopreserved rat acellular nerve allografts were applied to repair nerve injury in *** results suggest that cryopreservation can greatly extend the storage duration of acellular nerve tissue allografts without concomitant alteration of the physiochemical and biological properties of the engineered tissue to be used for transplantation.

关键词： nerve regeneration acellular nerve allografts cryopreservation storage transplantation nerve neural regeneration

高温后HSC粘结滑移基础参数测量与3D有限元数值模拟

在线全文

学校读者我要写书评

暂无评论

工程力学 2017年第4期34卷 177-186页

作者：赵卫平朱彬荣中国矿业大学力学与建筑工程学院北京100083 中国电力科学研究院北京100192

通过自行设计的装置测量了高温后粘结问题中的化学胶结力和摩擦系数,得出了它们随温度经历的变化规律。利用测得的基础参数定义了钢筋与混凝土界面的弹塑性库仑摩擦准则并将其植入有限元模型;采用面-面接触的接触单元模拟混凝土与钢筋... 详细信息

通过自行设计的装置测量了高温后粘结问题中的化学胶结力和摩擦系数,得出了它们随温度经历的变化规律。利用测得的基础参数定义了钢筋与混凝土界面的弹塑性库仑摩擦准则并将其植入有限元模型;采用面-面接触的接触单元模拟混凝土与钢筋界面的力学行为。模型通过对钢筋肋的显式离散实现了钢筋肋与混凝土间机械咬合作用的模拟。数值结果和试验数据的对比表明,该文提出的模型可以较好的模拟高温后带肋钢筋和混凝土之间的粘结滑移。最后,利用有限元模型对400℃温度经历拔出过程中的应力分布及裂缝的扩展进行了细致的研究。

关键词：粘结有限元分析高温拔出试验界面

Three-dimensional scanning technique in the congenital microtia reconstruction with tissue expander

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2021年第7期134卷 842-844页

作者： Shu-Qia Xu Xian-Lei Jia Yoonho Choi zhao-wei zhu Yang-Bin Xu Ram Velamuri Xiang-Xia Liu Division of Plastic Surgery First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong 510080China Department of Orthopedic Surgery Guangdong Hospital of Chinese Traditional MedicineZhuhai HospitalZhuhaiGuangdong 519000China Department of Plastic Surgery University of Tennessee Health Science CenterMemphisTN 38163USA.

To solve the problems of the color,texture mismatch and lack of sensory after skin graft,Brent applied tissue expansion technique in microtia reconstruction in *** recently,several groups from China and Korea reported their successful experiences of soft tissue expansion technique in microtia reconstruction with excellent results and low complication rate.[1]One of the critical questions is whether there is enough skin or not after the ***,this question may only be answered by an empirical judgment from the experienced *** this article,the authors introduced the preliminary results of a new objective and quantitative measuring system by using three-dimensional(3D)surface scanning technique to help the surgeons in microtia reconstruction with tissue expansion technique.

关键词： expansion dimensional enough

提高活塞式单机双级制冷压缩机K_e值及可靠性研究

在线全文

学校读者我要写书评

暂无评论

沈阳建筑大学学报（自然科学版） 2016年第5期32卷 914-921页

作者：王子彪赵巍熊伟朱立李刚沈阳建筑大学市政与环境工程学院辽宁沈阳110168 沈阳弘熙源科贸有限公司辽宁沈阳110004 武汉商业服务学院机电工程系湖北武汉430050

目的研究提高活塞式单机双级制冷压缩机在低温工况下的单位功率制冷量Ke值.方法采用数值计算及试验的方法对制冷压缩机的性能进行分析研究,优化气阀结构,用有限元法进行结构强度设计.结果在工质为R717、缸径100 mm、缸数比2/6、行程100... 详细信息

目的研究提高活塞式单机双级制冷压缩机在低温工况下的单位功率制冷量Ke值.方法采用数值计算及试验的方法对制冷压缩机的性能进行分析研究,优化气阀结构,用有限元法进行结构强度设计.结果在工质为R717、缸径100 mm、缸数比2/6、行程100 mm、转速1 485 r/min、名义工况35℃/-40℃条件下,研制的新型单机双级制冷压缩机S810AC的Ke实测值达1.77 k W/k W,此类型单机双级制冷压缩机国际上单位功率制冷量Ke实测值仅达1.69 k W/k W.结论通过对比气阀运动规律的实验数据和模拟结果,显示出两者具有较高的吻合度,模型单机双级制冷压缩机能较真实地反映气阀实际运动规律,证明所建立的模型准确可靠.气阀运动规律的试验测定值可以用模拟计算代替,提出了压缩机部件的结构参数,压缩机的计算机辅助设计模型也能对压缩机的合理设计有一定的指导作用.

关键词：单机双级制冷压缩机计算机模拟气阀系统结构优化综合性能指标

A new horizon for neuroscience:terahertz biotechnology in brain research

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 309-325页

作者： Zhengping Pu Yu Wu Zhongjie zhu Hongwei zhao Donghong Cui Shanghai Key Laboratory of Psychotic Disorders Shanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghaiChina Department of Psychiatry Kangci Hospital of JiaxingTongxiangZhejiang ProvinceChina Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of ScienceShanghaiChina National Facility for Protein Science in Shanghai Shanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina

Terahertz biotechnology has been increasingly applied in various biomedical fields and has especially shown great potential for application in brain *** this article,we review the development of terahertz biotechnology and its applications in the field of *** evidence indicates promising prospects for the use of terahertz spectroscopy and terahertz imaging techniques in the diagnosis of amyloid disease,cerebrovascular disease,glioma,psychiatric disease,traumatic brain injury,and myelin *** vitro and animal experiments have also demonstrated the potential therapeutic value of terahertz technology in some neuropsychiatric *** the precise underlying mechanism of the interactions between terahertz electromagnetic waves and the biosystem is not yet fully understood,the research progress in this field shows great potential for biomedical noninvasive diagnostic and therapeutic ***,the biosafety of terahertz radiation requires further exploration regarding its two-sided efficacy in practical *** review demonstrates that terahertz biotechnology has the potential to be a promising method in the field of neuropsychiatry based on its unique advantages.

关键词： biological effect brain neuron neuropsychiatry neuroscience non-thermal effect terahertz imaging terahertz radiation terahertz spectroscopy terahertz technology

Magnetic resonance imaging evaluation and nuclear receptor binding SET domain protein 1 mutation in the Sotos syndrome with attention-deficit/hyperactivity disorder

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第2期13卷 5-9页

作者： wei zhu Shanghai XiRong Information Science and Technology Co. LtdNational Science and Technology ParkSchool of Life Sciences and TechnologyTongji UniversityShanghai 200092China

Sotos syndrome is characterized by overgrowth features and is caused by alterations in the nuclear receptor binding SET domain protein 1 ***/hyperactivity disorder(ADHD)is considered a neurodevelopment and psychiatric disorder in *** characteristics and clinical presentation could play an important role in the diagnosis of Sotos syndrome and *** resonance imaging(MRI)has been used to assess medical images in Sotos syndrome and *** images process is considered to display in MRI while wavelet fusion has been used to integrate distinct images for achieving more complete information in single image in this *** the future,genetic mechanisms and artificial intelligence related to medical images could be used in the clinical diagnosis of Sotos syndrome and ADHD.

关键词： Sotos syndrome Attention-deficit/hyperactivity disorder Genetic mutation Magnetic resonance imaging Wavelet fusion