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Reflection and transmission of electromagnetic slow-waves by a uniformly moving dielectric slab

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Chinese Science Bulletin 2010年第34期55卷 3875-3879页

作者： XIA dan dong TianLin Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan 430074 China

The reflection and transmission problem of an electromagnetic slow-wave by a uniformly moving dielectric slab was investigated *** relationships among the field vectors of the incident,reflected and transmitted waves,and the reflection and transmission coefficients were derived based on the electromagnetic theory and the principle of special *** numerical analysis shows that at a small mechanical velocity the reflection coefficient of the electromagnetic slow-wave can be close to unit by choosing an appropriate period and mode-order;this is obviously different from that of a fast *** results are significant for research on electromagnetics and electrodynamics,and may have applicability to other fields.

关键词：电磁理论平板理论波传输介质移动均匀狭义相对论波反射

Fluorescence Emission from Small Molecules Containing Amino Group

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Chinese Chemical Letters 2006年第4期17卷 502-504页

作者： dong Jun WANG dan dan JIA Yong Guang ZHAO Xi Hai SHEN Yue dong YANG Hebei Normal University of Science and Technology Department of Chemistry Qinhuangdao 066600

After the treatment of oxygen gas, the small molecules containing amine group could emit fluorescence. Oxidation was believed to play an important role in the formation of fluorescence centers. Compared to previous re... 详细信息

关键词： Fluorescence amine oxidation oxygen.

Thermodynamic Calculations of Melt in Melt Pool During Laser Cladding High Silicon Coatings

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Journal of Iron and Steel Research International 2008年第3期15卷 5-10页

作者： dong dan-yang LIU Chang-sheng ZHANG Bin Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern UniversityShenyang 110004 Liaoning China

Based on the Miedema＇s formation heat model for binary alloys and the Toop＇s asymmetric model for ternary alloys, the formation heat, excess entropy, and activity coefficients of silicon ranging from 1 900 K to 4 100 K in the Fe-Si-C melt formed during the laser cladding high silicon coatings process were calculated. The results indicated that all values of lnγ^0Si, ε^CSi,ρ^SiSi and ρ^CSi are negative in the temperature range and these values increase as the temperature increases. And all values of ε^SiSi and ρ^Si-CSi are positive and these values decrease with increasing temperature. The iso-activity lines of silicon are distributed axisymmetrically to the incident laser beam in the melt pool vertical to the laser scanning direction. And the iso-activity lines of silicon in the front of the melt pool along the laser scanning direction are more intensive than those in the back of the melt pool. The activity of silicon on the bottom of the melt pool is lower than that in the effecting center of laser beam on the top surface of the melt pool and it may be the important reason for the formation of the silicides and excellent metallurgical bonding between the laser cladding coating and the substrate.

关键词： laser cladding silicon steel high silicon content coating thermodynamic calculation Miedema's formation heat model

Successful treatment of pyogenic ventriculitis caused by extensively drug-resistant Acinetobacter baumannii with multi-route tigecycline: A case report

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World Journal of Clinical Cases 2021年第3期9卷 651-658页

作者： Wei Li dan-dong Li Bo Yin dong-dong Lin Han-Song Sheng Nu Zhang Department of Neurosurgery The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina

BACKGROUND Pyogenic ventriculitis caused by extensively drug-resistant Acinetobacter baumannii(***)is one of the most severe complications associated with ***,limited therapeutic options exist for the treatment of *** ventriculitis due to the poor penetration rate of most antibiotics through the blood-brain *** SUMMARY A 68-year-old male patient with severe traumatic brain injury developed pyogenic ventriculitis on postoperative day 24 caused by extensively drug-resistant *** susceptible to tigecycline *** treatment was accomplished through multi-route administration of tigecycline,including intravenous combined with continuous ventricular irrigation plus intraventricular *** pus was cleared on the 3rd day post-irrigation,and cerebrospinal fluid cultures were negative after 12 *** Our findings suggest that multi-route administration of tigecycline can be a therapeutic option against pyogenic ventriculitis caused by extensively drugresistant ***.

关键词： Pyogenic ventriculitis Acinetobacter baumannii Extensively drug-resistant Tigecycline Ventricular irrigation Case report

Tailoring Carbon Distribution inα/γPhase of Ductile Iron and Its Effects on Thermal Conductivity

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Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 645-651页

作者：刘琛杜玉洲 YING Tao ZHANG Liandong ZHANG Xinyu dong dan JIANG Bailing School of Materials Science and Engineering Xi'an University of TechnologyXi'an 710048China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China The Second Afflated Hospital of Xi'an Jiaotong University Xi'an 710004China

The effects of carbon distribution on the microstructure and thermal conductivity of ductile iron were investigated in the present *** microstructure of as-cast and quenched ductile iron were characterized by OM and *** showed that the microstructure of as-cast ductile iron was composed of spheroidal graphite,ferrite with the volume of 80%,and a small amount of pearlite,and quenched ductile iron was composed of spheroidal graphite,coarse/fine acicular martensite(α_(M)phase)and high-carbon retained austenite(γphase).The volume fraction of retained austensite and its carbon content for direct quenched ductile iron and tepmered ductile iron were quantitatively analysed by *** revealed that carbon atoms diffused fromα_(M)phase toγphase during tempering at low temperatures,which resulted in carbon content in retainedγphase increasing from 1.2 wt%for the direct quenched sample to about 1.9 wt%for the tempered ***,the lattice distortion was significantly reduced and gave rise to an increase of thermal conductivity for ductile iron.

关键词： ductile iron carbon distribution retained austenite thermal conductivity lattice distortion

An infrared and visible image fusion method based upon multi-scale and top-hat transforms

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Chinese Physics B 2018年第11期27卷 340-348页

作者： Gui-Qing He Qi-Qi Zhang Hai-Xi Zhang Jia-Qi Ji dan-dan dong Jun Wang School of Electronics and Information Northwestern Polytechnical University Xi'an 710072 China School of Information Technology Northwestern University Xi'an 710072 China

The high-frequency components in the traditional multi-scale transform method are approximately sparse, which can represent different information of the details. But in the low-frequency component, the coefficients around the zero value are very few, so we cannot sparsely represent low-frequency image information. The low-frequency component contains the main energy of the image and depicts the profile of the image. Direct fusion of the low-frequency component will not be conducive to obtain highly accurate fusion result. Therefore, this paper presents an infrared and visible image fusion method combining the multi-scale and top-hat transforms. On one hand, the new top-hat-transform can effectively extract the salient features of the low-frequency component. On the other hand, the multi-scale transform can extract highfrequency detailed information in multiple scales and from diverse directions. The combination of the two methods is conducive to the acquisition of more characteristics and more accurate fusion results. Among them, for the low-frequency component, a new type of top-hat transform is used to extract low-frequency features, and then different fusion rules are applied to fuse the low-frequency features and low-frequency background; for high-frequency components, the product of characteristics method is used to integrate the detailed information in high-frequency. Experimental results show that the proposed algorithm can obtain more detailed information and clearer infrared target fusion results than the traditional multiscale transform methods. Compared with the state-of-the-art fusion methods based on sparse representation, the proposed algorithm is simple and efficacious, and the time consumption is significantly reduced.

关键词： infrared and visible image fusion multi-scale transform mathematical morphology top-hat trans- form

LLMs in medicine:The need for advanced evaluation systems for disruptive technologies

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The Innovation 2024年第3期5卷 1-2页

作者： Yi-Da Tang Er-dan dong Wen Gao Department of Cardiology and Institute of Vascular Medicine Peking University Third HospitalBeijing 100191China State Key Laboratory of Vascular Homeostasis and Remodeling Peking UniversityBeijing 100191China University of Health and Rehabilitation Sciences Qingdao 266000China Peking University Beijing 100871China

In an era of rapid advancements in artificial intelligence(AI),the potential role of large language models(LLMs)in the medical field is receiving increasing *** progression of this technology not only highlights upcoming revolutionary changes in medical services but also offers unprecedented opportunities for the health care sector.1 LLMs’formidable capability to process natural language opens vast prospects for application in the medical field,including in the contexts of emergency triage,geriatric care,and digital medical workflows.

关键词： dis highlights services

Expression and location of α-fetoprotein during rat colon development

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World Journal of Gastroenterology 2009年第14期15卷 1738-1743页

作者： Xiao-Yan Liu dan dong Peng Sun Jun Du Luo Gu Ying-Bin Ge Department of Physiology Nanjing Medical University Nanjing 210029 Jiangsu Province China

AIM： To investigate the expression of α-fetoprotein （AFP）, a cancer-associated fetal glycoprotein, and its involvement during rat colon development. METHODS： Colons from Sprague-Dawley rat fetuses, young and adult （8 wk old） animals were used in this study. Expression levels of AFP in colons of different development stage were detected by reversetranscriptase PCR （RT-PCR） and Western blotting. To identify the cell location of AFP in the developing rat colons, double-immunofluorescent staining was performed using antibodies to specific cell markers and AFP, respectively. RESULTS： The highest levels of AFP mRNA were detected in colons of rats at embryonic day 18.5 （e18.5）. Compared to e18.5 d, the AFP expression was significantly decreased during rat development （85% for e20.5, P 〈 0.05, 58% for postnatal day 0.5 （P〈0.5）, P 〈 0.05, 37% for P7, P 〈 0.05, 24% for P14, P 〈 0.05, and 11% for P21, P 〈 0.05） and undetected in adult rats. Only the 72-kDa isoform of AFP was detected by Western blotting, the expression pattern was similar to AFP mRNA and conformed to the results of mRNA expression. The AFP positive staining was identical to different distribution patterns in fetuses, young and adult animals and positive staining for both AFP and vimentin was overlapped in mesenchymal cells at each stage tested. CONCLUSION： This study has for the first time demonstrated that AFP is localized in the mesenchyme of rat colon from the embryo to the weaning stage by immunofluorescence and presents 72-kDa isoform in the developing rat colons by Western blotting. The dynamic expression of AFP in the various developmental stages of the colon indicates that AFP might be involved in many aspects of colon development.

关键词： Alpha-fetoprotein Development Mesenchyme Colon Rat

Small intestinal lipomas:Diagnostic value of multi-slice CT enterography

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World Journal of Gastroenterology 2010年第21期16卷 2677-2681页

作者： Fang, Song-Hua dong, dan-Jun Chen, Fang-Hong Jin, Mei Zhong, Bai-Shu Zhejiang Univ Sir Run Run Shaw Inst Clin Med Sir Run Run Shaw Hosp Dept Radiol Hangzhou 310016 Zhejiang Peoples R China Zhejiang Prov Peoples Hosp Dept Radiol Hangzhou 310017 Zhejiang Peoples R China Zhejiang Univ Sir Run Run Shaw Inst Clin Med Sir Run Run Shaw Hosp Dept Pathol Hangzhou 310016 Zhejiang Peoples R China Zhejiang Univ Affiliated Hosp 1 Sch Med Dept Radiol Hangzhou 310013 Zhejiang Peoples R China

AIM:To analyze the clinical and imaging features of the small intestinal lipomas and to evaluate the diagnostic value of multi-slice computed tomography(CT) ***:Fourteen cases(one had two intestinal lesions) of surgically confirmed lipomas of the small intestine were retrospectively *** location,size,clinical and radiological aspects were ***:Twelve patients presented with abdominal pain,of whom three complained of paroxysmal *** or bloody stools was mentioned in five *** lesion was detected incidentally during routine physical *** lesion was found unexpectedly during the preoperational evaluation for *** of the abdomen revealed palpable masses in four *** CT scan showed round or oval well-defined hypo-intense intraluminal masses with the attenuation ranging from-130 HU to-60 *** contrast enhancement CT scan,no striking enhancement was ***:The small intestinal lipomas are rare and difficult to diagnose merely based on clinical manifestations,while the characteristic features at small intestinal CT enterography can help establish reliable prospective diagnoses.

关键词： Lipoma Small bowel Computed tomography X-ray Enterography