检索结果-南通市图书馆

Rare Metals 2022年第4期41卷 1380-1384页

作者： zhen-dong wang zhen-Quan Lai Department of Physics Nanchang UniversityNanchang 330031China

Single(200)-oriented TiN thin films were deposited on quartz substrate by direct current(DC) magnetron reactive sputtering process at a wide range of substrate temperature from 200 to 600 ℃.The effects of sputtering pressure and substrate temperature on the crystalline nature,morphology,electrical and optical properties of the deposited thin films were analyzed by X-ray diffraction(XRD),atomic force microscopy(AFM),four-point resistivity test system and ultraviolet visible near-infrared(UV-Vis-NIR) spectroscopy,*** results show that single(200)-oriented TiN thin films can be obtained at a wide range of substrate temperature from 200 to 600 ℃ with the grain size increasing from 35.9 to 64.5 *** resistivity of the product is as low as95 μΩ·cm,and the value of the optical reflectance is above68 % in the near-infrared(NIR) range of 760-1500 nm.

关键词： TiN thin film DC magnetron reactive sputtering Crystal orientation Optical property

Broadband Source Ranging in Shallow Water Using the Ω-Interference Spectrum

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第6期27卷 110-113页

作者： ZHAO zhen-dong wang Ning GAO Da-Zhi wang Hao-Zhong College of Information Science and Engineering Ocean University of China Qingdao 266100

The concept of the waveguide invariant is revisited and a simple relationship between the range of source and the quasi-period of the acoustic interference spectrum in the frequency domain （Ω-interference spectrum） is derived. Then a method for a broadband source ranging in shallow water using a single receiver and a broadband guide source, requiring no modeling and no knowledge about the ocean environment, is proposed. The method is validated by simulation and verified with the experimental data.

关键词： Methods Broadband Source Ranging Ω-Interference Spectrum

Robotic-assisted surgery for pediatric choledochal cyst: Case report and literature review

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 2018年第7期6卷 143-149页

作者： Xian-Qiang wang Shu-Juan Xu zheng wang Yuan-Hong Xiao Jing Xu zhen-dong wang Di-Xiang Chen Department of Pediatrics PLA General Hospital Center of Anesthesia and Operation PLA General Hospital

Our paper describes the key surgical points of pediatric choledochocystectomy performed completely by Da Vinci robotic system. A choledochocystectomy was safely carried out for a girl at our hospital, and without any complication. Then systematic literature review was done to discuss the methods of intestine surgery and intestinal anastomosis, the use of 3 rd robotic arm, the surgical safety and advantages comparing open and laparoscopic surgery. We systematically reviewed choledochocystectomy for children performed by robotic surgery. We included a total of eight domestic and foreign reports and included a total of 86 patients, whose average age was 6.3(0.3-15.9) years; the maleto-female ratio was 1:3.5(19:67). Seven patients experienced conversion to open surgery, and the surgery success rate was 91.9%(79/86). The average total operation time was 426(180-520) min, the operation time on the machine was 302(120-418) min, 11 cases used the number 3 arm, and the remaining mainly used the hitch-stitch technique to suspend the stomach wall and liver. Forty-seven patients underwent pull-through intestine and intestinal anastomosis, and 39 patients underwent complete robotic intestine surgery and intestinal anastomosis. The hospitalization time of roboticassisted choledochocystectomy was 8.8 d. Eight patientshad biliary fistula and were all cured by conservative treatment and continuous observation. One patient had anastomotic stenosis, and one patient had wound dehiscence, both cured by surgery. Choledochocystectomy for children performed by completely robotic surgery and Roux-en-Y hepaticojejunostomy is safe and feasible. The initial experience shows that this surgical approach has a clearer field than the traditional endoscopy, and its operation is more flexible, the surgery is more accurate, and the injury is smaller. With the advancement of technology and the accumulation of surgeons' experience, robotic surgery may become a new trend in this surgical procedure.

关键词： Choledochocystectomy Robotic surgery Pediatrics Congenital choledochal cysts

Krüppel-like factor 7 attenuates hippocampal neuronal injury after traumatic brain injury

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 2022年第3期17卷 661-672页

作者： Wen-Yuan Li Xiu-Mei Fu zhen-dong wang Zhi-Gang Li Duo Ma Ping Sun Gui-Bo Liu Xiao-Feng Zhu Ying wang Institute of Neural Tissue Engineering Mudanjiang Medical UniversityMudanjiangHeilongjiang ProvinceChina Department of Anatomy College of Basic Medical SciencesChengde Medical UniversityChengdeHebei ProvinceChina Hebei Key Laboratory of Nerve Injury and Repair Chengde Medical UniversityChengdeHebei ProvinceChina Department of Otorhinolaryngology Mudanjiang City Second People’s HospitalMudanjiangHeilongjiang ProvinceChina The First Department of General Surgery Hongqi HospitalMudanjiang Medical UniversityMudanjiangHeilongjiang ProvinceChina

Our previous study has shown that the transcription factor Krüppel-like factor 7(KLF7) promotes peripheral nerve regeneration and motor function recovery after spinal cord ***7 also participates in traumatic brain injury,but its regulatory mechanisms remain poorly *** the present study,an HT22 cell model of traumatic brain injury was established by stretch injury and oxygenglucose *** cells were then transfected with an adeno-associated virus carrying KLF7(AAV-KLF7).The results revealed that,after stretch injury and oxygen-glucose deprivation,KLF7 greatly reduced apoptosis,activated caspase-3 and lactate dehydrogenase,downregulated the expression of the apoptotic markers B-cell lymphoma 2(Bcl-2)-associated X protein(Bax) and cleaved caspase-3,and increased the expression of βIII-tubulin and the antiapoptotic marker ***,KLF7 overexpression upregulated Janus kinase 2(JAK2) and signal transducer and activator of transcription 3(STAT3) phosphorylation in HT22 cells treated by stretch injury and oxygenglucose *** assays revealed that KLF7 directly participated in the phosphorylation of *** addition,treatment with AG490,a selective inhibitor of JAK2/STAT3,weakened the protective effects of KLF7.A mouse controlled cortical impact model of traumatic brain injury was then *** 30 minutes before modeling,AAV-KLF7 was injected into the ipsilateral lateral *** protein and m RNA levels of KLF7 in the hippocampus were increased at 1 day after injury and recovered to normal levels at 3 days after ***7 reduced ipsilateral hippocampal atrophy,decreased the injured cortex volume,downregulated Bax and cleaved caspase-3 expression,and increased the number of 5-bromo-2'-deoxyuridine-positive neurons and Bcl-2 protein ***,KLF7 transfection greatly enhanced the phosphorylation of JAK2 and STAT3 in the ipsilateral *** results suggest that KLF7 may protect h

关键词： apoptosis hippocampus JAK2/STAT3 Kruppel-like factor 7 neuroprotection oxygen-glucose deprivation stretch traumatic brain injury

Application and progress of medical imaging in total mesopancreas excision for pancreatic head carcinoma

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2021年第11期13卷 1315-1326页

作者： Pei Feng Bo Cheng zhen-dong wang Jun-Gui Liu Wei Fan Heng Liu Chao-Ying Qi Jing-Jing Pan Department of Radiology PLA Rocket Force Characteristic Medical CenterBeijing 100088China Department of Pathology PLA Rocket Force Characteristic Medical CenterBeijing 100088China Department of Ultrasound Beijing Sihui Hospital of Traditional Chinese MedicineBeijing 100022China Department of Hepatobiliary Surgery PLA Rocket Force Characteristic Medical CenterBeijing 100088China

Pancreatic head carcinoma(PHC)is one of the common gastrointestinal malignancies with a high morbidity and poor *** present,radical surgery is still the curative treatment for ***,in clinical practice,the actual R0 resection rate,the local recurrence rate,and the prognosis of PHC are ***,the concept of total mesopancreas excision(TMpE)is proposed to achieve R0 *** there have various controversies and discussions on the definition,the range of excision,and clinical prognosis of TMpE,the concept of TMpE can effectively increase the R0 resection rate,reduce the local recurrence rate,and improve the prognosis of *** is of importance in preoperative examination for PHC;however,traditional imaging assessment of PHC does not focus on *** review discusses the application of medical imaging in TMpE for PHC,to provide more accurate preoperative evaluation,range of excision,and more valuable postoperative follow-up evaluation for TMpE through *** is believed that with further extensive research and exploratory application of TMpE for PHC,large-sample and multicenter studies will be realized,thus providing reliable evidence for imaging evaluation.

关键词： Pancreatic head carcinoma Mesopancreas Total mesopancreas excision Imaging Computed tomography Magnetic resonance imaging

Effect of Different Amendments on Ryegrass Growth in Copper Mine Tailings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2003年第4期13卷 299-308页

作者： HAO Xiu-zhen, ZHOU dong-Mei, wang Yu-Jun, CANG Long and CHEN Huai-ManInstitute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China). E-mail: xzhao@issas. *** Institute of Soil Science the Chinese Academy of Sciences Nanjing 210008 (China)

Montmorillonite, rice straw, organic manure and chemical fertilizer were usedas amendment materials for copper mine tailings, and their effects on mine tailing pH, nutrientsarid metal availability to ryegrass were investigated. Chemical fertilization was the most effectiveone in improving ryegrass growth in mine tailings among the amendment materials examined. It wasfound that montmorillonite raised biomass of ryegrass at the 1st and 2nd cuts, but it did not givefurther positive effects at the3rd and 4th cuts. The effect of organic materials on ryegrass growthwas not so good as expected, mainly due to their slow decomposition in mine tailings with less soilmicroorganisms. Available Cu and Zn contents in mine tailings decreased in the presence ofmontmorillonite but increased when rice straw and organic manure were used as amendments. Cu and Zncontents in ryegrass decreased with increasing the rate of montmorillonite application but increasedwith the rate of rice straw. Zn showed much stronger mobility from soil lo ryegrass than Cu, andalmost all the available N and P in mine tailings, except for the treatments with organic manure,were completely consumed after ryegrass had grown in mine tailings for more than four months andbeen harvested for four times. Owing to its large biomass and high metal uptake, ryegrass is apotential plant for remediation of metal contaminated soils in practice.

关键词： amendment metal availability mine tailings remediation ryegrass

在线全文

学校读者我要写书评

暂无评论

链式平滑切换变体飞行器LPV鲁棒跟踪控制

北京航空航天大学学报 2017年第4期43卷 831-841页

作者：贾臻董朝阳王青北京航空航天大学航空科学与工程学院北京100083 北京航空航天大学自动化科学与电气工程学院北京100083

针对后掠角可变的变体飞行器,研究了一类变体飞行器的建模与控制问题。拟合气动参数与后掠角变化的关系,利用Jacobian线性化的方法得到线性变参数(LPV)模型。进一步建立一类平滑切换系统,同时引入切换序列受限的链式切换,推导了链式平... 详细信息

针对后掠角可变的变体飞行器,研究了一类变体飞行器的建模与控制问题。拟合气动参数与后掠角变化的关系,利用Jacobian线性化的方法得到线性变参数(LPV)模型。进一步建立一类平滑切换系统,同时引入切换序列受限的链式切换,推导了链式平滑切换系统在有限时间有界且具有鲁棒性能指标的充分条件。设计了一种平滑切换镇定控制器的求解算法,并给出控制增益的求解步骤。基于广义系统理论提出了保证变体飞行器姿态跟踪系统鲁棒稳定的充分条件,并通过算例验证所提方法有效性。

关键词：鲁棒控制平滑切换切换系统变体飞行器链式切换

Diagnostic advances of artificial intelligence and radiomics in gastroenterology

在线全文

学校读者我要写书评

暂无评论

Artificial Intelligence in Gastroenterology 2020年第2期1卷 37-50页

作者： Pei Feng zhen-dong wang Wei Fan Heng Liu Jing-Jing Pan Department of Radiology PLA Rocket Force Characteristic Medical CenterBeijing 100088China Department of Ultrasound Beijing Sihui Hospital of Traditional Chinese MedicineBeijing 100022China

Traditional medical imaging,including ultrasound,computed tomography,magnetic resonance imaging,or positron emission tomography,remains widely used diagnostic modalities for gastrointestinal diseases at *** modalities are used to assess changes in morphology,attenuation,signal intensity,and enhancement *** tumors,especially malignant tumors,are commonly seen in clinical practice with an increasing number of deaths each *** the imaging manifestations of different diseases usually overlap,accurate early diagnosis of tumor lesions,noninvasive and effective evaluation of tumor staging,and prediction of prognosis remain ***,traditional medical images contain a great deal of important information that cannot be recognized by human eyes but can be extracted by artificial intelligence(AI)technology,which can quantitatively assess the heterogeneity of lesions and provide valuable information,including therapeutic effects and patient *** the development of computer technology,the combination of medical imaging and AI technology is considered to represent a promising field in medical image *** new emerging field is called“radiomics”,which makes big data mining and extraction from medical imagery possible and can help clinicians make effective decisions and develop personalized treatment ***,AI and radiomics have been gradually applied to lesion detection,qualitative and quantitative diagnosis,histopathological grading and staging of tumors,therapeutic efficacy assessment,and prognosis *** this minireview,we briefly introduce the basic principles and technology of ***,we review the research and application of AI and radiomics in gastrointestinal diseases,especially diagnostic advancements of radiomics in the differential diagnosis,treatment option,assessment of therapeutic efficacy,and prognosis evaluation of esophageal,gastric,hepatic,pancreatic,and colorect

关键词： Artificial intelligence Radiomics Texture analysis Gastroenterology Esophageal disease Gastric diseases Hepatic disease

Prognostic factors and staging systems of multiple myeloma:a single centre study in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2007年第19期120卷 1655-1658页

作者： TAO Zhong-fei FU Wei-jun YUAN zhen-gang wang dong-xing CHEN Yu-bao HOU Jian Department of Haematology Shanghai Changzheng Hospital Second Military Medical University Shanghai 200003 China

Background Previous studies found a range of prognostic factors but no consensus about the proper staging system for multiple myeloma has been achieved. This study explored the prognostic factors to find a staging system for multiple myeloma most suitable for Chinese patients. Methods Between February 1990 to August 2004, 206 patients （138 men and 68 women, mean aged （59±11） years） who were initially diagnosed as multiple myeloma in Changzheng Hospital （Shanghai, China） and had followup records were enrolled in this study. Potential prognostic factors were evaluated by univariate and multivariate analyses. Four staging systems were applied to compare their suitability for the patients. Results The median survival time of the patients was 33 months. The 1-, 3- and 5-year survival rates were 80.18%, 48.08% and 33.7% respectively. Factors identified as adversely affecting survival were older age, severe bone lesions, low haemoglobin, low platelet, low serum calcium, low serum albumin, high proportion of plasma cells in marrow, high serum creatinine, high serum β2 microglobulin and high C-reactive protein. Among these, only C-reactive protein, β2 microglobulin, albumin and age were the independent prognostic factors. There were statistically significant survival differences among the three groups in Durie Salmon staging system and Bataille staging system, but not in British Medical Research Council staging system or International Staging System. Conclusions High β2 microglobulin, high C-reactive protein, low albumin and old age are independent prognostic factors of multiple myeloma. Bataille staging system appears to be optimal for Chinese multiple myeloma patients.

关键词： multiple myeloma prognosis survival analysis clinical staging system

在线全文

学校读者我要写书评

暂无评论

新闻事件的分布式混合推荐算法

北京理工大学学报 2017年第7期37卷 721-726页

作者：牛振东王帅王诗航陈杰北京理工大学计算机学院北京100081 北京市海量语言信息处理与云计算应用工程技术研究中心北京100081

针对新闻的个性化服务差及推荐效率低的问题,提出了一种新闻事件的分布式混合推荐算法.该算法改进了传统的层次聚类算法用于新闻事件发现,通过协调簇中心距离和簇间最远距离的权重解决了传统层次聚类中的大簇问题;使用混合推荐算法进行... 详细信息

针对新闻的个性化服务差及推荐效率低的问题,提出了一种新闻事件的分布式混合推荐算法.该算法改进了传统的层次聚类算法用于新闻事件发现,通过协调簇中心距离和簇间最远距离的权重解决了传统层次聚类中的大簇问题;使用混合推荐算法进行事件推荐,引入了事件的多重特征来计算用户兴趣模型,更准确地表示用户的兴趣偏好;采用Spark分布式计算平台实现该算法,可处理大数据的个性化推荐问题.在公开数据集上的实验结果表明本文方法有效.

关键词： Spark 分布式层次聚类用户兴趣模型混合推荐