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可控源音频大地电磁法若干方法技术问题的探讨 被引量:14
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作者 张国鸿 李仁和 张良敏 《安徽地质》 2009年第2期119-123,共5页
通过用可控源音频大地电磁法在已知隐伏矿体上的方法实验结果;探讨了可控源音频大地电磁法在实际应用中若干方法技术问题。
关键词 可控源 电磁法 方法技术 二维反演
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磁性纳米材料在样品前处理中的应用进展与展望 被引量:13
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作者 丁青青 张文敏 张兰 《色谱》 CAS CSCD 北大核心 2020年第1期14-21,共8页
在样品前处理技术中,吸附剂材料起关键作用。随着纳米材料的发展,越来越多的纳米材料被用作吸附剂以提高对目标物的萃取效率。磁性纳米材料因其具有易于分离、表面可修饰、吸附能力强和良好的生物相容性等优异性能,已广泛应用于分析方... 在样品前处理技术中,吸附剂材料起关键作用。随着纳米材料的发展,越来越多的纳米材料被用作吸附剂以提高对目标物的萃取效率。磁性纳米材料因其具有易于分离、表面可修饰、吸附能力强和良好的生物相容性等优异性能,已广泛应用于分析方法的样品前处理技术中。该文通过对磁性纳米材料在磁性固相萃取和在其他样品前处理技术中的研究与应用展开总结和论述,对磁性纳米材料的稳定性、作用力、比表面积及孔径调控的制备进行了阐述,展望了磁性纳米材料在分离科学中的应用前景,为进一步研究磁性纳米材料的应用提供了参考。 展开更多
关键词 磁性纳米材料 前处理技术 综述
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Fe-6.5%Si高硅钢的性能及制备技术 被引量:13
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作者 郑鑫 严彪 《材料导报(纳米与新材料专辑)》 EI CAS 2012年第1期392-396,共5页
Fe-6.5%Si高硅钢是一种具有高磁导率、低矫顽力和低铁损等优异软磁性能的合金,但是其室温脆性和低的热加工性能严重影响了其在工业领域的应用。综述了Fe-6.5%Si高硅钢的性能,评述了合金的改性法、特殊轧制法、快速凝固法、沉积扩散法、... Fe-6.5%Si高硅钢是一种具有高磁导率、低矫顽力和低铁损等优异软磁性能的合金,但是其室温脆性和低的热加工性能严重影响了其在工业领域的应用。综述了Fe-6.5%Si高硅钢的性能,评述了合金的改性法、特殊轧制法、快速凝固法、沉积扩散法、粉末冶金法等制备工艺。 展开更多
关键词 Fe-6.5%Si高硅钢 磁性能 制备技术
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磁共振成像技术探讨 被引量:9
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作者 张平寅 钱英 《医疗卫生装备》 CAS 2005年第2期19-21,共3页
介绍了磁共振各种成像技术的原理和临床应用,展示了目前磁共振成像技术发展的水平。
关键词 磁共振 成像技术 临床应用
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Double-target neural circuit-magnetic stimulation improves motor function in spinal cord injury by attenuating astrocyte activation 被引量:4
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作者 Dan Zhao Ye Zhang +5 位作者 Ya Zheng Xu-Tong Li Cheng-Cheng Sun Qi Yang Qing Xie Dong-Sheng Xu 《Neural Regeneration Research》 SCIE CAS CSCD 2023年第5期1062-1066,共5页
Multi-target neural circuit-magnetic stimulation has been clinically shown to improve rehabilitation of lower limb motor function after spinal cord injury. However, the precise underlying mechanism remains unclear. In... Multi-target neural circuit-magnetic stimulation has been clinically shown to improve rehabilitation of lower limb motor function after spinal cord injury. However, the precise underlying mechanism remains unclear. In this study, we performed double-target neural circuit-magnetic stimulation on the left motor cortex and bilateral L5 nerve root for 3 successive weeks in a rat model of incomplete spinal cord injury caused by compression at T10. Results showed that in the injured spinal cord, the expression of the astrocyte marker glial fibrillary acidic protein and inflammatory factors interleukin 1β, interleukin-6, and tumor necrosis factor-α had decreased, whereas that of neuronal survival marker microtubule-associated protein 2 and synaptic plasticity markers postsynaptic densification protein 95 and synaptophysin protein had increased. Additionally, neural signaling of the descending corticospinal tract was markedly improved and rat locomotor function recovered significantly. These findings suggest that double-target neural circuit-magnetic stimulation improves rat motor function by attenuating astrocyte activation, thus providing a theoretical basis for application of double-target neural circuit-magnetic stimulation in the clinical treatment of spinal cord injury. 展开更多
关键词 ASTROCYTE inflammatory response microtubule-associated protein 2 motor function motor-evoked potential neural circuit-magnetic stimulation neural repair neuromodulation technique spinal cord injury synaptic plasticity
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某难选白钨矿磁化浮选工艺研究 被引量:8
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作者 邓湘湘 廖德华 《矿业研究与开发》 CAS 北大核心 2015年第12期55-59,共5页
某矽卡岩型白钨矿属含钙矿物量高的难选白钨矿石。为了提高白钨精矿质量,在浮选回收白钨矿时采用水系磁处理浮选工艺进行试验,试验研究结果表明:在不改变常规浮选工艺流程的条件下,水系磁处理浮选工艺可提高药剂与矿物的作用效果,减少... 某矽卡岩型白钨矿属含钙矿物量高的难选白钨矿石。为了提高白钨精矿质量,在浮选回收白钨矿时采用水系磁处理浮选工艺进行试验,试验研究结果表明:在不改变常规浮选工艺流程的条件下,水系磁处理浮选工艺可提高药剂与矿物的作用效果,减少浮选时调整剂、捕收剂的用量,且可提高分选指标。矿石经全浮脱硫后,在水系磁处理条件下,进行了白钨常温粗选,白钨粗精矿经一粗五精三扫闭路流程加温精选,最终获得了钨品位65.94%、回收率79.12%的合格白钨精矿。 展开更多
关键词 白钨矿 含钙类脉石矿物 磁化浮选 浮选工艺
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Treatment of anastomotic stricture after rectal cancer operation by magnetic compression technique:A case report
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作者 Miao-Miao Zhang Huan-Chen Sha +5 位作者 Hai-Rong Xue Yuan-Fa Qin Fang-Fang Dong Li Zhang Yi Lyu Xiao-Peng Yan 《World Journal of Gastrointestinal Surgery》 SCIE 2024年第5期1443-1448,共6页
BACKGROUNDThe treatment of postoperative anastomotic stenosis(AS)after resection of colorectalcancer is challenging.Endoscopic balloon dilation is used to treat stenosisin such cases,but some patients do not show impr... BACKGROUNDThe treatment of postoperative anastomotic stenosis(AS)after resection of colorectalcancer is challenging.Endoscopic balloon dilation is used to treat stenosisin such cases,but some patients do not show improvement even after multipleballoon dilations.Magnetic compression technique(MCT)has been used for gastrointestinalanastomosis,but its use for the treatment of postoperative AS aftercolorectal cancer surgery has rarely been reported.CASE SUMMARYWe report a 72-year-old man who underwent radical resection of colorectal cancerand ileostomy one year ago.An ileostomy closure was prepared six months ago,but colonoscopy revealed a narrowing of the rectal anastomosis.Endoscopic balloondilation was performed three times,but colonoscopy showed no significantimprovement in stenosis.The AS was successfully treated using MCT.CONCLUSIONMCT is a minimally invasive method that can be used for the treatment of postoperativeAS after colorectal cancer surgery. 展开更多
关键词 Rectostenosis magnetic surgery magnetic Surgery Clinic Rectal cancer magnetic compression technique Case report
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Integrated gravity and magnetic study on patterns of petroleum basin occurrence in the China seas and adjacent areas 被引量:3
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作者 Tao He Wanyin Wang +3 位作者 Zhizhao Bai Xingang Luo Jing Ma Yimi Zhang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2023年第3期201-214,共14页
The China seas and adjacent areas contain numerous petroleum basins.One of the main challenges for future oil and gas exploration is to identify the inherent patterns of petroleum basin distribution.The formation and ... The China seas and adjacent areas contain numerous petroleum basins.One of the main challenges for future oil and gas exploration is to identify the inherent patterns of petroleum basin distribution.The formation and evolution of petroleum basins along with the migration and accumulation of oil and gas are often closely related to the tectonic environment.The gravity and magnetic fields with high lateral resolution and wide coverage provide important data for regional tectonic research.Based on the gravity data in the Global Satellite Gravity Anomaly Database(V31.1)and magnetic data from the Earth Magnetic Anomaly Grid(2-arc-minute resolution)(V2),this study uses integrated gravity and magnetic field technique to obtain integrated gravity and magnetic field result for the China seas and adjacent areas,and then adopts the normalized vertical derivative of the total horizontal derivative technique to conduct partition.Finally,it identifies the relationship between the partition characteristics and tectonics as well as the patterns of petroleum basin occurrence.The research shows that the partition of gravity and magnetic field integrated result has a good correlation with the Neo-Cathaysian tectonic system and tectonic units.The petroleum basins are characterized according to three blocks arranged from north to south and four zones arranged from east to west.The north-south block structure causes the uneven distribution of oil and gas resources in the mainland area and the differences in the hydrocarbon-bearing strata.Petroleum basins are more abundant in the north than in the south.The ages of the main oil-and gas-bearing strata are“Paleozoic–Mesozoic,Paleozoic–Mesozoic–Cenozoic,and Paleozoic–Mesozoic”,in order from north to south.The difference in the overall type of oil and gas resources in all basins is controlled by the east–west zonation.From east to west,the oil and gas resource type exhibits a wave-like pattern of“oil and gas,gas,oil and gas,gas”.The vertical distribution is characterized 展开更多
关键词 China seas petroleum basins integrated gravity and magnetic field technique partition characteristics three blocks four zones
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One-Dimensional Magnetic FeCoNi Alloy Toward Low-Frequency Electromagnetic Wave Absorption 被引量:6
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作者 Bintong Yang Jiefeng Fang +7 位作者 Chunyang Xu Hui Cao Ruixuan Zhang Biao Zhao Mengqiu Huang Xiangyu Wang Hualiang Lv Renchao Che 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第10期260-272,共13页
Rational designing of one-dimensional(1D)magnetic alloy to facilitate electromagnetic(EM)wave attenuation capability in low-frequency(2-6 GHz)microwave absorption field is highly desired but remains a significant chal... Rational designing of one-dimensional(1D)magnetic alloy to facilitate electromagnetic(EM)wave attenuation capability in low-frequency(2-6 GHz)microwave absorption field is highly desired but remains a significant challenge.In this study,a composite EM wave absorber made of a FeCoNi medium-entropy alloy embedded in a 1D carbon matrix framework is rationally designed through an improved electrospinning method.The 1D-shaped FeCoNi alloy embedded composite demonstrates the high-density and continuous magnetic network using off-axis electronic holography technique,indicating the excellent magnetic loss ability under an external EM field.Then,the in-depth analysis shows that many factors,including 1D anisotropy and intrinsic physical features of the magnetic medium-entropy alloy,primarily contribute to the enhanced EM wave absorption performance.Therefore,the fabricated EM wave absorber shows an increasing effective absorption band of 1.3 GHz in the low-frequency electromagnetic field at an ultrathin thickness of 2 mm.Thus,this study opens up a new method for the design and preparation of high-performance 1D magnetic EM absorbers. 展开更多
关键词 Medium-entropy magnetic alloy ONE-DIMENSION Off-axis electronic holography technique Improved electrospinning Lower-frequency electromagnetic wave absorption
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电动汽车电磁辐射骚扰测量技术研究与实践 被引量:6
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作者 徐立 武建刚 《汽车工程》 EI CSCD 北大核心 2006年第5期427-429,442,共4页
论述电动汽车的电磁场辐射骚扰的测量技术,重点论述频率范围为9kHz^30MHz的辐射骚扰测量方法中的难点问题,并对2种实验样车的电场和磁场骚扰分别进行了测量验证。
关键词 电动汽车 电场 磁场 辐射骚扰 测量技术
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湖泊(水库)沉积物分析在土壤侵蚀研究中的运用 被引量:7
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作者 薛天翼 王红亚 《地理科学进展》 CSSCI CSCD 北大核心 2018年第7期890-900,共11页
土壤侵蚀研究对于防治自然灾害,实现土地的可持续利用具有重要的现实意义。由于一些地区长期以来水文观测资料较为匮乏,针对过去时间段内的土壤侵蚀研究通常需要寻找替代指标。湖泊(水库)作为流域内侵蚀产物的"汇",其沉积物... 土壤侵蚀研究对于防治自然灾害,实现土地的可持续利用具有重要的现实意义。由于一些地区长期以来水文观测资料较为匮乏,针对过去时间段内的土壤侵蚀研究通常需要寻找替代指标。湖泊(水库)作为流域内侵蚀产物的"汇",其沉积物可不同程度地记录较长时期土壤侵蚀的具体特征,因此,基于湖泊(水库)沉积物分析的土壤侵蚀研究具有较强的应用价值和发展潜力。本文主要围绕确定土壤侵蚀年代,反演侵蚀过程,探寻沉积物来源的研究主线,详细论述了湖泊(水库)沉积物中放射性同位素、矿物磁性、粒度以及地球化学指标的应用原理和方法,分别总结了国内外学者利用湖泊(水库)沉积物在上述3个领域所取得的研究成果,在此基础上讨论了目前研究中存在的不确定性,并对未来的研究方向进行了展望。 展开更多
关键词 湖泊(水库)沉积物 土壤侵蚀 磁性特征 指纹示踪
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Optimization of tracheoesophageal fistula model established with Tshaped magnet system based on magnetic compression technique
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作者 Miao-Miao Zhang Jian-Qi Mao +5 位作者 Lin-Xin Shen Ai-Hua Shi Xin Lyu Jia Ma Yi Lyu Xiao-Peng Yan 《World Journal of Gastroenterology》 SCIE CAS 2024年第16期2272-2280,共9页
BACKGROUND The magnetic compression technique has been used to establish an animal model of tracheoesophageal fistula(TEF),but the commonly shaped magnets present limitations of poor homogeneity of TEF and poor model ... BACKGROUND The magnetic compression technique has been used to establish an animal model of tracheoesophageal fistula(TEF),but the commonly shaped magnets present limitations of poor homogeneity of TEF and poor model control.We designed a Tshaped magnet system to overcome these problems and verified its effectiveness via animal experiments.AIM To investigate the effectiveness of a T-shaped magnet system for establishing a TEF model in beagle dogs.METHODS Twelve beagles were randomly assigned to groups in which magnets of the Tshaped scheme(study group,n=6)or normal magnets(control group,n=6)were implanted into the trachea and esophagus separately under gastroscopy.Operation time,operation success rate,and accidental injury were recorded.After operation,the presence and timing of cough and the time of magnet shedding were observed.Dogs in the control group were euthanized after X-ray and gastroscopy to confirm establishment of TEFs after coughing,and gross specimens of TEFs were obtained.Dogs in the study group were euthanized after X-ray and gastroscopy 2 wk after surgery,and gross specimens were obtained.Fistula size was measured in all animals,and then harvested fistula specimens were examined by hematoxylin and eosin(HE)and Masson trichrome staining.RESULTS The operation success rate was 100%for both groups.Operation time did not differ between the study group(5.25 min±1.29 min)and the control group(4.75 min±1.70 min;P=0.331).No bleeding,perforation,or unplanned magnet attraction occurred in any animal during the operation.In the early postoperative period,all dogs ate freely and were generally in good condition.Dogs in the control group had severe cough after drinking water at 6-9 d after surgery.X-ray indicated that the magnets had entered the stomach,and gastroscopy showed TEF formation.Gross specimens of TEFs from the control group showed the formation of fistulas with a diameter of 4.94 mm±1.29 mm(range,3.52-6.56 mm).HE and Masson trichrome staining showed scar tissue formation and hierarchical structu 展开更多
关键词 magnetic surgery magnetic compression technique Tracheoesophageal fistula magnet Animal model Beagles
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Novel magnetic compression technique for the treatment of postoperative anastomotic stenosis in rectal cancer:A case report
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作者 Miao-Miao Zhang Huan-Chen Sha +9 位作者 Hai-Rong Xue Yuan-Fa Qin Xiao-Gang Song Yun Li Yu Li Zheng-Wu Deng Yu-Lin Gao Fang-Fang Dong Yi Lyu Xiao-Peng Yan 《World Journal of Gastrointestinal Surgery》 SCIE 2024年第6期1926-1932,共7页
BACKGROUND The treatment of postoperative anastomotic stenosis after excision of rectal cancer is challenging.Endoscopic balloon dilation and radial incision are not effective in all patients.We present a new endoscop... BACKGROUND The treatment of postoperative anastomotic stenosis after excision of rectal cancer is challenging.Endoscopic balloon dilation and radial incision are not effective in all patients.We present a new endoscopy-assisted magnetic compression technique(MCT)for the treatment of rectal anastomotic stenosis.We successfully applied this MCT to a patient who developed an anastomotic stricture after radical resection of rectal cancer.A 50-year-old man had undergone laparoscopic radical rectal cancer surgery at a local hospital 5 months ago.A colonoscopy performed 2 months ago indicated that the rectal anastomosis was narrow due to which ileostomy closure could not be performed.The patient came to the Magnetic Surgery Clinic of the First Affiliated Hospital of Xi'an Jiaotong University after learning that we had successfully treated patients with colorectal stenosis using MCT.We performed endoscopy-assisted magnetic compression surgery for rectal stenosis.The magnets were removed 16 d later.A follow-up colonoscopy performed after 4 months showed good anastomotic patency,following which,ileostomy closure surgery was performed.CONCLUSION MCT is a simple,non-invasive technique for the treatment of anastomotic stricture after radical resection of rectal cancer.The technique can be widely used in clinical settings. 展开更多
关键词 Rectal cancer magnetic compression technique magnetosurgery Anastomotic stricture magnetic surgery clinic Case report
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Clinical feasibility of laparoscopic left lateral segment liver resection with magnetic anchor technique:The first clinical study from China
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作者 Miao-Miao Zhang Ji-Gang Bai +7 位作者 Dong Zhang Jie Tao Zhi-Min Geng Zhuo-Qun Li Yu-Xiang Ren Yu-HanZhang Yi Lyu Xiao-Peng Yan 《World Journal of Gastrointestinal Surgery》 SCIE 2024年第5期1336-1343,共8页
BACKGROUND Magnetic anchor technique(MAT)has been applied in laparoscopic cholecystectomy and laparoscopic appendectomy,but has not been reported in laparoscopic partial hepatectomy.AIM To evaluate the feasibility of ... BACKGROUND Magnetic anchor technique(MAT)has been applied in laparoscopic cholecystectomy and laparoscopic appendectomy,but has not been reported in laparoscopic partial hepatectomy.AIM To evaluate the feasibility of the MAT in laparoscopic left lateral segment liver resection.METHODS Retrospective analysis was conducted on the clinical data of eight patients who underwent laparoscopic left lateral segment liver resection assisted by MAT in our department from July 2020 to November 2021.The Y-Z magnetic anchor devices(Y-Z MADs)was independently designed and developed by the author of this paper,which consists of the anchor magnet and magnetic grasping apparatus.Surgical time,intraoperative blood loss,intraoperative accidents,operator experience,postoperative incision pain score,postoperative complications,and other indicators were evaluated and analyzed.RESULTS All eight patients underwent a MAT-assisted laparoscopic left lateral segment liver resection,including three patients undertaking conventional 5-port and five patients having a transumbilical single-port operation.The mean operation time was 138±34.32 min(range 95-185 min)and the mean intraoperative blood loss was 123±88.60 mL(range 20-300 mL).No adverse events occurred during the operation.The Y-Z MADs showed good workability and maneuverability in both tissue and organ exposure.In particular,the operators did not experience either a“chopstick”or“sword-fight”effect in the single-port laparoscopic operation.CONCLUSION The results show that the MAT is safe and feasible for laparoscopic left lateral segment liver resection,especially,exhibits its unique abettance for transumbilical single-port laparoscopic left lateral segment liver resection. 展开更多
关键词 magnetosurgery/magnetic surgery magnetic anchor technique Laparoscopic hepatectomy Transumbilical singleport laparoscopy magnet
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Y–Z deformable magnetic ring for the treatment of rectal stricture: A case report and review of literature
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作者 Miao-Miao Zhang Huan-Chen Sha +2 位作者 Yuan-Fa Qin Yi Lyu Xiao-Peng Yan 《World Journal of Gastroenterology》 SCIE CAS 2024年第6期599-606,共8页
BACKGROUND Treatment of postoperative anastomotic stenosis for colorectal cancer is often challenging,especially for patients who do not respond well to endoscopy.In cases where patients have undergone an enterostomy,... BACKGROUND Treatment of postoperative anastomotic stenosis for colorectal cancer is often challenging,especially for patients who do not respond well to endoscopy.In cases where patients have undergone an enterostomy,the stenosis can be easily resolved through magnetic compression.However,common magnetic compre-ssion techniques cannot be performed on those without enterostomy.We design-ed a novel Y–Z deformable magnetic ring(Y–Z DMR)and successfully applied it to a patient with a stenosis rectal anastomosis and without enterostomy after rectal cancer surgery.CASE SUMMARY We here report the case of a 57-year-old woman who had undergone a laparo-scopic radical rectum resection(Dixon)for rectal cancer.However,she started facing difficulty in defecation 6 months after surgery.Her colonoscopy indicated stenosis of the rectal anastomosis.Endoscopic balloon dilation was performed six times on her.However,the stenosis still showed a trend of gradual aggravation.Because the patient did not undergo an enterostomy,the conventional endoscopic magnetic compression technique could not be performed.Hence,we imple-mented a Y–Z DMR implemented through the anus under single channel.The magnetic ring fell off nine days after the operation and the rectal stenosis was relieved.The patient was followed up for six months and reported good defeca-tion.CONCLUSION The Y–Z DMR deformable magnetic ring is an excellent treatment strategy for patients with rectal stenosis and without enterostomy. 展开更多
关键词 Anastomotic stenosis Colorectal cancer magnetosurgery magnetic compression technique magnetic surgery clinic Case report
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Animal experimental study on magnetic anchor technique-assisted endoscopic submucosal dissection of early gastric cancer 被引量:1
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作者 Min Pan Miao-Miao Zhang +2 位作者 Lin Zhao Yi Lyu Xiao-Peng Yan 《World Journal of Gastrointestinal Endoscopy》 2023年第11期658-665,共8页
BACKGROUND Gastric cancer(GC)has high morbidity and mortality.Moreover,because GC has no typical symptoms in the early stages,most cases are already in the advanced stages by the time the symptoms appear,thus resultin... BACKGROUND Gastric cancer(GC)has high morbidity and mortality.Moreover,because GC has no typical symptoms in the early stages,most cases are already in the advanced stages by the time the symptoms appear,thus resulting in poor prognosis and a low survival rate.Endoscopic submucosal dissection(ESD)can realize the early detection and diagnosis of GC and become the main surgical method for early GC.However,ESD has a steep learning curve and high technical skill requirements for endoscopists,which is not conducive to its widespread implementation and advancement.Therefore,a series of auxiliary techniques have been derived.AIM To evaluate the safety and efficacy of magnetic anchor technique(MAT)-assisted ESD in early GC.METHODS This was an ex vivo animal experiment.The experimental models were the isolated stomachs of pigs,which were divided into two groups,namely the study group(n=6)with MAT-assisted ESD and the control group(n=6)with traditional ESD.Comparing the total surgical time,incidence of surgical complications,complete mucosal resection rate,specimen size,and the scores of endoscopist’s satisfaction with the procedure reflected their feelings about convenience during the surgical procedure between the two groups.The magnetic anchor device for auxiliary ESD in the study group comprised three parts,an anchor magnet(AM),a target magnet(TM),and a soft tissue clip.Under gastroscopic guidance,the soft tissue clip and the TM were delivered to the pre-marked mucosal lesion through the gastroscopic operating hole.The soft tissue clip and the TM were connected by a thin wire through the TM tail structure.The soft tissue clip was released by manipulating the operating handle of the soft tissue clip in a way that the soft tissue clip and the TM were fixed to the lesion mucosa.In vitro,ESD is aided by maneuvering the AM such that the mucosal dissection surface is exposed.RESULTS The total surgical time was shorter in the study group than in the control group(26.57±0.19 vs 29.97±0.28,P<0.001),and the scores of endosco 展开更多
关键词 Endoscopic submucosal dissection Gastric cancer Digestive disease magnetic anchor technique magnetic surgery magnetic anchor device
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Pt/Co/Au多层膜中磁斯格明子的密度调控
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作者 徐琦 张宇中 +9 位作者 胡玥 李泽林 姜泽 王楠 蒙萱 邓霞 关超帅 朱柳 张军伟 彭勇 《电子显微学报》 CAS CSCD 北大核心 2024年第2期155-163,共9页
磁斯格明子是一种拓扑自旋结构,凭借其尺寸小、结构稳定和驱动电流密度低等特性,有望成为新一代赛道磁存储器件的信息存储单元。在存有磁斯格明子的材料体系中,具有界面Dzyaloshinskii-Moriya Interaction(DMI)的铁磁多层膜可与现代纳... 磁斯格明子是一种拓扑自旋结构,凭借其尺寸小、结构稳定和驱动电流密度低等特性,有望成为新一代赛道磁存储器件的信息存储单元。在存有磁斯格明子的材料体系中,具有界面Dzyaloshinskii-Moriya Interaction(DMI)的铁磁多层膜可与现代纳米制造工艺兼容,并且这种铁磁多层膜产生的磁斯格明子在室温下可稳定存在,这为基于磁斯格明子研发的电子器件提供了材料基础。然而磁性多层膜中界面DM相互作用、交换相互作用和偶极相互作用等各种作用之间的竞争,导致了磁斯格明子密度的随机变化,降低了磁斯格明子器件的可控性。因此,系统的研究材料参数对磁斯格明子密度的调控具有重要的意义。本文通过改变磁性层Co层的厚度调控了磁性多层膜中磁斯格明子的密度。实验结果表明,随着Co层厚度的增加,磁斯格明子的密度先增加后减少,其中Co层为2.1 nm时磁斯格明子密度最大。理论计算表明,磁性层厚度的变化会引起磁各向异性的转变和内禀属性DM相互作用的改变,进而影响磁斯格明子密度的变化。 展开更多
关键词 磁斯格明子 球差电镜 洛伦兹技术 磁性层厚度
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Magnetic resonance imaging-based deep learning model to predict multiple firings in double-stapled colorectal anastomosis 被引量:2
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作者 Zheng-Hao Cai Qun Zhang +7 位作者 Zhan-Wei Fu Abraham Fingerhut Jing-Wen Tan Lu Zang Feng Dong Shu-Chun Li Shi-Lin Wang Jun-Jun Ma 《World Journal of Gastroenterology》 SCIE CAS 2023年第3期536-548,共13页
BACKGROUND Multiple linear stapler firings during double stapling technique(DST)after laparoscopic low anterior resection(LAR)are associated with an increased risk of anastomotic leakage(AL).However,it is difficult to... BACKGROUND Multiple linear stapler firings during double stapling technique(DST)after laparoscopic low anterior resection(LAR)are associated with an increased risk of anastomotic leakage(AL).However,it is difficult to predict preoperatively the need for multiple linear stapler cartridges during DST anastomosis.AIM To develop a deep learning model to predict multiple firings during DST anastomosis based on pelvic magnetic resonance imaging(MRI).METHODS We collected 9476 MR images from 328 mid-low rectal cancer patients undergoing LAR with DST anastomosis,which were randomly divided into a training set(n=260)and testing set(n=68).Binary logistic regression was adopted to create a clinical model using six factors.The sequence of fast spin-echo T2-weighted MRI of the entire pelvis was segmented and analyzed.Pure-image and clinical-image integrated deep learning models were constructed using the mask region-based convolutional neural network segmentation tool and three-dimensional convolutional networks.Sensitivity,specificity,accuracy,positive predictive value(PPV),and area under the receiver operating characteristic curve(AUC)was calculated for each model.RESULTS The prevalence of≥3 linear stapler cartridges was 17.7%(58/328).The prevalence of AL was statistically significantly higher in patients with≥3 cartridges compared to those with≤2 cartridges(25.0%vs 11.8%,P=0.018).Preoperative carcinoembryonic antigen level>5 ng/mL(OR=2.11,95%CI 1.08-4.12,P=0.028)and tumor size≥5 cm(OR=3.57,95%CI 1.61-7.89,P=0.002)were recognized as independent risk factors for use of≥3 linear stapler cartridges.Diagnostic performance was better with the integrated model(accuracy=94.1%,PPV=87.5%,and AUC=0.88)compared with the clinical model(accuracy=86.7%,PPV=38.9%,and AUC=0.72)and the image model(accuracy=91.2%,PPV=83.3%,and AUC=0.81).CONCLUSION MRI-based deep learning model can predict the use of≥3 linear stapler cartridges during DST anastomosis in laparoscopic LAR surgery.This model might help determine the best anastomosis s 展开更多
关键词 Deep learning Image-reading artificial intelligence magnetic resonance imaging Predictive model Double stapling technique Linear stapler Rectal cancer Laparoscopic surgery Low anterior resection Anastomotic leakage
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Establishment of acquired tracheoesophageal fistula using a modified magnetic compression technique in rabbits and its postmodeling evaluation
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作者 Han Meng Fu-Yao Nan +7 位作者 Na Kou Qin-Yan Hong Ming-Sheng Lv Ju-Bo Li Bao-Jie Zhang Hang Zou Lei Li Hong-Wu Wang 《World Journal of Gastrointestinal Surgery》 SCIE 2024年第5期1385-1394,共10页
BACKGROUND Previous studies have validated the efficacy of both magnetic compression and surgical techniques in creating rabbit tracheoesophageal fistula(TEF)models.Magnetic compression achieves a 100%success rate but... BACKGROUND Previous studies have validated the efficacy of both magnetic compression and surgical techniques in creating rabbit tracheoesophageal fistula(TEF)models.Magnetic compression achieves a 100%success rate but requires more time,while surgery,though less frequently successful,offers rapid model establishment and technical maturity in larger animal models.AIM To determine the optimal approach for rabbit disease modeling and refine the process.METHODS TEF models were created in 12 rabbits using both the modified magnetic compression technique and surgery.Comparisons of the time to model establishment,success rate,food and water intake,weight changes,activity levels,bronchoscopy findings,white blood cell counts,and biopsies were performed.In response to the failures encountered during modified magnetic compression modeling,we increased the sample size to 15 rabbit models and assessed the repeatability and stability of the models,comparing them with the original magnetic compression technique.RESULTS The modified magnetic compression technique achieved a 66.7%success rate,whereas the success rate of the surgery technique was 33.3%.Surviving surgical rabbits might not meet subsequent experimental requirements due to TEF-related inflammation.In the modified magnetic compression group,one rabbit died,possibly due to magnet corrosion,and another died from tracheal magnet obstruction.Similar events occurred during the second round of modified magnetic compression modeling,with one rabbit possibly succumbing to aggravated lung infection.The operation time of the first round of modified magnetic compression was 3.2±0.6 min,which was significantly reduced to 2.1±0.4 min in the second round,compared to both the first round and that of the original technique.CONCLUSION The modified magnetic compression technique exhibits lower stress responses,a simple procedure,a high success rate,and lower modeling costs,making it a more appropriate choice for constructing TEF models in rabbits. 展开更多
关键词 Tracheoesophageal fistula Modified magnetic compression technique Post-modeling evaluation Pneumonia MALNUTRITION
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Primary animal experiment to test the feasibility of a novel Y-Z magnetic hepatic portal blocking band
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作者 Miao-Miao Zhang Chen-Guang Li +7 位作者 Shu-Qin Xu Jian-Qi Mao Yu-Xiang Ren Yu-Han Zhang Jia Ma Ai-Hua Shi Yi Lyu Xiao-Peng Yan 《World Journal of Gastrointestinal Surgery》 SCIE 2023年第7期1286-1293,共8页
BACKGROUND Hepatic portal blood flow occlusion is a common technique for reducing hepatic hemorrhage during hepatectomy.We designed a novel Y-Z magnetic hepatic portal blocking band(Y-Z MHPBB)based on the principle of... BACKGROUND Hepatic portal blood flow occlusion is a common technique for reducing hepatic hemorrhage during hepatectomy.We designed a novel Y-Z magnetic hepatic portal blocking band(Y-Z MHPBB)based on the principle of magnetic compression technique.AIM To introduce the Y-Z MHPBB device and verify the feasibility of this device for hepatic portal blood flow occlusion in dogs.METHODS Ten beagles were randomly divided into the experimental group and control group.The operation time,intraoperative blood loss,the number of portal blood flow occlusions,the total time spent on adjusting the blocking band,and the average time spent on adjusting the blocking band were recorded.The surgeons evaluated the feasibility and flexibility of the two portal occlusion devices.RESULTS Laparoscopic hepatectomy was successfully performed in both the experimental group and control group.There was no statistical difference between the two groups in the operation time,intraoperative blood loss,and the number of hepatic portal blood flow occlusions.With respect to the total time spent on adjusting the blocking band and the average time spent on adjusting the blocking band,the experimental group showed significantly better outcomes than the control group,with a statistical difference(P<0.05).The operators found that the Y-Z MHPBB was superior to the modified T-tube in terms of operational flexibility.CONCLUSION The Y-Z MHPBB seems to be an ingenious design,accurate blood flow occlusion effect,and good flexibility;and it can be used for hepatic portal blood flow occlusion during laparoscopic hepatectomy. 展开更多
关键词 Hepatic portal blood flow occlusion Laparoscopic hepatectomy Novel Y-Z magnetic hepatic portal blocking band magnetic surgery magnetic compression technique Beagles
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