检索结果-南通市图书馆

Feedback analysis and design of inductive power links driven by Class-E amplifiers with variable coupling coefficients

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第8期11卷 629-636页

作者： Tian-liang YANG chun-yu zhao Da-yue CHEN Institute of Intelligent Mechatronics Research School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

The efficiency of inductive power links driven by Class-E amplifiers may deteriorate due to variation in the coupling coefficient when the relative position of the radio frequency (RF) coils *** solve this problem,a new design methodology of power links is presented in this *** aim of the new design is to use the feedback signal,which is a phase difference between the driving signal and the output current of the Class-E amplifier,to adjust the duty cycle and angular frequency of the driving signal to maintain the optimum state of the inductive power link,and to adjust the supply voltage to keep the output power constant when the coupling coefficient of the RF coils *** parameter adjustments with respect to the coupling coefficient and the feedback signal are derived from the design equation of the inductive power *** validate the feedback control rules,a prototype of the inductive power link was constructed,and its performance validated with the coupling coefficient set at 0.2 and a duty cycle of *** experimental results showed that,by adjusting the duty cycle,the angular frequency,and the supply voltage,the power link can be kept in optimal operation with a constant output power when the coupling coefficient changes from 0.2 to 0.1 to 0.25.

关键词： Inductive power link Closed-loop Class-E amplifier High efficient Variable coupling coefficient

Improved switching based filter for protecting thin lines of color images

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第1期11卷 36-44页

作者： Chang-cheng WU chun-yu zhao Da-yue CHEN School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China

The classical vector median filter (VMF) has been widely used to remove impulse noise from color images. However, since the VMF cannot identify thin lines during the denoising process, many thin lines may be removed out as noise. This serious problem can be solved by a newly proposed filter that uses a noise detector to find these thin lines and then keep them unchanged. In this new approach, the noise detection scheme applied on a current processed pixel is realized through counting the close pixels in its eight neighbor positions and the expanded window to see whether the current pixel is corrupted by impulse noise. Based on the previous outputs, our algorithm can increase the performance in detecting and canceling the impulse noise. Extensive ex- periments indicate that this approach can be used to remove the impulse noise from a color image without distorting the useful information.

关键词： Vector median filter (VMF) Thin lines Impulse noise Color image

Intermittent abdominal pain accompanied by defecation difficulties caused by Chilaiditi syndrome: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2018年第15期6卷 1042-1046页

作者： Xia-Gang Luo Jing Wang Wu-Lin Wang chun-zhao yu Department of General Surgery the Second Affiliated Hospital of Nanjing Medical University

We report a case of intermittent lower abdominal pain and distension accompanied by defecation difficulties for 3 years due to Chilaiditi syndrome in a 59-yearold male. Before admission to our hospital, the patient had undergone gastroscopy, which showed gastritis and duodenitis, and colonoscopy, which showed cecum deformation and cicatricial changes of the mucous membrane in the colon hepatic flexure. A computed tomography(CT) scan of the abdomen at our hospital confirmed right hepatic atrophy and interposition of the colon. Moreover, CT simulation endoscopy identified cystic dilatation in the colon hepatic flexure with the widest diameter of 8.2 cm. The patient was diagnosed with Chilaiditi syndrome. As the patient was unable to endure his defecation difficulties, he underwent a laparoscope-assisted right hemicolectomy. The patient had a good recovery. During the follow-up period of 9 mo, the patient remained symptom-free.

关键词： Abdominal pain Diagnosis Management Laparoscope-assisted right hemicolectomy Chilaiditi sign Chilaiditi syndrome Case report

Giant ventral hernia simultaneously containing the spleen, a portion of the pancreas and the left hepatic lobe: A case report

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2020年第9期8卷 1721-1728页

作者： Xia-Gang Luo Chen Lu Wu-Lin Wang Fei Zhou chun-zhao yu Department of General Surgery the Second Affiliated Hospital of Nanjing Medical UniversityNanjing 2l0011Jiangsu ProvinceChina

BACKGROUND Ventral hernia,also known as incisional hernia,is a common complication of previous *** contents of ventral hernia may include omentum,preperitoneal fat,small intestine or ***,ventral hernia with protrusion of more than two parenchymal organs simultaneously is extremely rare,and its repair is very complex and *** should make a comprehensive assessment based on their own experience and the individual characteristics of the *** addition,psychological therapy should be emphasized in the whole treatment *** SUMMARY We report a rare case of asymptomatic giant ventral hernia for 15 years in a 21-year-old *** patient underwent umbilical hernia repair at the age of 1 *** 5 years later,ventral hernia recurred and repair with Mesh was performed,but the operation failed due to postoperative infection,and a huge mass appeared in the left abdominal *** mass increased gradually with the development and maturity of the *** tomography scan demonstrated that the patient's total spleen,part of the pancreas and left lobe of the liver were simultaneously herniated through the abdominal incisional *** the patient was unable to endure the inconvenience of life and the potential risk of spleen or liver rupture,she underwent a ventral hernia repair with Mesh at our *** operation was successful and the patient had a good *** a 3-mo follow-up,the patient remained asymptomatic and the appearance of the surgical incision was greatly *** Ventral hernia is a common complication of abdominal *** hernia with protrusion of more than two parenchymal organs simultaneously is extremely *** should pay attention to the psychological treatment while restoring the abdominal physiological function in ventral hernia patients.

关键词： Giant ventral hernia Spleen Pancreas Liver Mesh Case report

Periods and Energy Dissipations of a Novel TLD Rectangular Tank with Angle-adjustable Baffles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2008年第2期13卷 139-144页

作者：尚春雨赵金城 Department of Civil Engineering Shanghai Jiaotong University

A novel tuned liquid damper (TLD) rectangular tank with two angle-adjustable baffles was pre- *** numerical analysis was performed using the commercial code *** standard kinetic energy and dissipation rate turbulent model was employed,which was solved using volume of fluid (VOF) method able to treat both the free surface motion and the viscous stresses over the rigid walls *** relationship between the natural periods of water and the angles of its baffles was studied by numerical sim- ulating of a case,and the changes of energy dissipations were *** natural periods and dampers of the novel TLD can be changed in a wide range by adjusting the baffles' angle,thus it is more effective in controlling the vibration of structures in a wide frequency range.

关键词： tuned liquid damper angle-adjustable baffle turbulent eddies energy dissipation

在线全文

学校读者我要写书评

暂无评论

损伤控制性手术在胰腺外伤中的应用

中国实用外科杂志 2007年第1期27卷 36-37页

作者：苗毅喻春钊南京医科大学第一附属医院普外科江苏南京210029

损伤控制性手术(damage control surgery,DCS)是近年来倍受关注的外科治疗原则,是一种复杂外科问题应急分期处理的理念。临床实践业已证明,DCS的合理应用可以有效降低复杂创伤病人的病死率。本文就近年来国内外相关进展结合笔者的临床实... 详细信息

损伤控制性手术(damage control surgery,DCS)是近年来倍受关注的外科治疗原则,是一种复杂外科问题应急分期处理的理念。临床实践业已证明,DCS的合理应用可以有效降低复杂创伤病人的病死率。本文就近年来国内外相关进展结合笔者的临床实践,对DCS在胰腺外伤中的应用作一介绍。[第一段]

关键词：损伤控制性手术胰腺外伤 surgery 外科治疗原则临床实践外科问题创伤病人 DCS

Research and application of absorbable screw in orthopedics： a clinical review comparing PDLLA screw with metal screw in patients with simple medial malleolus fracture

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Traumatology 2013年第1期16卷 27-30页

作者： TANG Jin HU Jin-feng GUO Wei-chun yu Ling zhao Sheng-hao Foxconn Clinic Renmin Hospital of Wuhan UniversityWuhan 430060 China

Objective： To observe the therapeutic effect of absorbable screw in medial malleolus fracture and discuss its clinical application in orthopedics. Methods： A total of 129 patients with simple medial malleolus fracture were studied. Among them, 64 patients were treated with poly-D, L-lactic acid （PDLLA） absorbable screws, while the others were treated with metal screws. All the patients were followed up for 12-20 months （averaged 18.4 months） and the therapeutic effect was evaluated according to the American Orthopaedic Foot and Ankle Society clinical rating systems. Results： In absorbable screw group, we obtained excel- lent and good results in 62 cases （96.88%）; in steel screw group, 61 cases （93.85%） achieved excellent and good results. There was no significant difference between the two groups. Conclusion： In the treatment of malleolus fracture, absorbable screw can achieve the same result compared with metal screw fixation. Absorbable screw is preferred due to its advantages of safety, cleanliness and avoiding the removal procedure associated with metallic implants.

关键词： Ankle Bone screws Fractures, bone

Ideal Bi‑Based Hybrid Anode Material for Ultrafast Charging of Sodium‑Ion Batteries at Extremely Low Temperatures

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 152-167页

作者： Jie Bai Jian Hui Jia yu Wang chun Cheng Yang Qing Jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022People’s Republic of China

Sodium-ion batteries have emerged as competitive substitutes for low-temperature applications due to severe capacity loss and safety concerns of lithium-ion batteries at−20°C or ***,the key capability of ultrafast charging at ultralow temperature for SIBs is rarely ***,a hybrid of Bi nanoparticles embedded in carbon nanorods is demonstrated as an ideal material to address this issue,which is synthesized via a high temperature shock *** a hybrid shows an unprecedented rate performance(237.9 mAh g^(−1)at 2 A g^(−1))at−60℃,outperforming all reported SIB anode *** with a Na_(3)V_(2)(PO_(4))_(3)cathode,the energy density of the full cell can reach to 181.9 Wh kg^(−1)at−40°*** on this work,a novel strategy of high-rate activation is proposed to enhance performances of Bi-based materials in cryogenic conditions by creating new active sites for interfacial reaction under large current.

关键词： Bi nanoparticles High temperature shock High-rate activation Ultrafast charging Low-temperature sodium-ion batteries

A new horizon for neuroscience:terahertz biotechnology in brain research

维普期刊数据库评论

在线全文

维普期刊数据库

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