检索结果-南通市图书馆

Face Detection under Complex Background and Illumination

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2015年第1期13卷 78-82页

作者： Shao-Dong Lv yong-duan song Mei Xu Cong-Ying Huang School of Energy Science and Engineering University of Electronic Science and Technology

For face detection under complex background and illumination, a detection method that combines the skin color segmentation and cost-sensitive Adaboost algorithm is proposed in this paper. First, by using the characteristic of human skin color clustering in the color space, the skin color area in YC b C r color space is extracted and a large number of irrelevant backgrounds are excluded; then for remedying the deficiencies of Adaboost algorithm, the cost-sensitive function is introduced into the Adaboost algorithm; finally the skin color segmentation and cost-sensitive Adaboost algorithm are combined for the face detection. Experimental results show that the proposed detection method has a higher detection rate and detection speed, which can more adapt to the actual field environment.

关键词： Adaboost cost-sensitive learning face detection skin color segmentation

Role of interventional endovascular therapy for delayed hemorrhage after pancreaticoduodenectomy

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2010年第21期123卷 3110-3117页

作者： WANG Zhi-jun WANG Mao-qiang LIU Feng-yong duan Feng song Peng FAN Qing-sheng Department of Interventional Radiology Chinese People's Liberation Army General Hospital Beijing 100853 China

Background Delayed massive hemorrhage （DMH） after pancreaticoduodenectomy （PD） is a sedous complication and one of the most common causes of mortality after PD. Its ideal management remains unclear. This paper is to present our experience in the endovascular treatment of patients with DMH after PD using different techniques and *** During a seven years period, 19 patients （fifteen men, four women） with DMH arter PD were treated with endovascular procedures, including transcatheter arterial embolization （TAE） with coils embolization in eight cases, with coils plus N-butyl-2-cyanoacrylate （NBCA）-Lipiodol mixture in six cases, and stent-graft placement in five cases. The mean age of the patients was 58.2 years. Follow-up, including clinical condition, liver function tests, and Doppler ultrasound examinations, was *** The immediate technical success rate was 84.2% （16/19）. There were no significant procedure-related complications. Hemostasis was not achieved with interventional procedures in three patients： one died of uncontrolled bleeding four days after the second TAE, and two patients required emergency laparotomy without re-angiography because of worsening clinical status. Among the 16 patients with successfully stopped bleeding who became hemodynamically stable after the procedure without evidence of further bleeding, two patients died during the peri-interventional procedure period because of multiple organ failure, and fourteen patients survived to hospital discharge. The mean length of follow-up was 14.6 months. Recurrent bleeding after discharge did not occur in any of these cases. Clinical and laboratory follow-up findings were unremarkable. Doppler ultrasound examinatation verified patency of the hepatic artery in the four patients with stent-graft placement during the follow-up period （5 months-29 months; mean, 15.3 months）.Conclusions Interventional endovascular procedure is a safe and technically feasible solution to control D

关键词： pancreaticoduodenectomy delayed massive hemorrhage hepatic artery pseudoaneurysm interventional radiology

Recent Advances in Fibrous Materials for Hydroelectricity Generation

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 109-133页

作者： Can Ge Duo Xu Xiao Feng Xing Yang Zheheng song Yuhang song Jingyu Chen Yingcun Liu Chong Gao yong Du Zhe Sun Weilin Xu Jian Fang College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123People’s Republic of China National Engineering Laboratory for Modern Silk Soochow UniversitySuzhou 215123People’s Republic of China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200People’s Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123People’s Republic of China Department of Electrical and Computer Engineering University of MassachusettsAmherstMA 01003USA Department of Materials Imperial College LondonSouth Kensington CampusLondon SW72AZUK College of Textile Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China School of Materials Science and Engineering Shanghai Institute of Technology100 Haiquan RoadShanghai 201418People’s Republic of China

Depleting fossil energy sources and conventional polluting power generation pose a threat to sustainable *** generation from ubiquitous and spontaneous phase transitions between liquid and gaseous water has been considered a promising strategy for mitigating the energy *** materials with unique flexibility,processability,multifunctionality,and practicability have been widely applied for fibrous materials-based hydroelectricity generation(FHG).In this review,the power generation mechanisms,design principles,and electricity enhancement factors of FHG are first ***,the fabrication strategies and characteristics of varied constructions including 1D fiber,1D yarn,2D fabric,2D membrane,3D fibrous framework,and 3D fibrous gel are ***,the advanced functions of FHG during water harvesting,proton dissociation,ion separation,and charge accumulation processes are analyzed in ***,the potential applications including power supply,energy storage,electrical sensor,and information expression are also ***,some existing challenges are considered and prospects for future development are sincerely proposed.

关键词： Hydroelectricity Fibrous material Streaming potential Ion diffusion

马铃薯转录因子StFBH3对非生物逆境胁迫的响应分析

在线全文

学校读者我要写书评

暂无评论

作物学报 2025年第1期51卷 247-259页

作者：宋倩娜宋慧洋李京昊段永红梅超冯瑞云山西农业大学农学院山西太谷030801 山西省农业科学院作物科学研究所山西太原030031

bHLH (basic helix-loop-helix)作为植物界第二大类转录因子,在植物应对环境胁迫响应中起着重要的调控作用。探究马铃薯(Solanum tuberosum L.) bHLH家族基因功能将为马铃薯改良和育种提供一定的理论依据。本研究克隆了马铃薯StFBH3基因... 详细信息

bHLH (basic helix-loop-helix)作为植物界第二大类转录因子,在植物应对环境胁迫响应中起着重要的调控作用。探究马铃薯(Solanum tuberosum L.) bHLH家族基因功能将为马铃薯改良和育种提供一定的理论依据。本研究克隆了马铃薯StFBH3基因(Gene ID:102582309),利用qPCR技术分析了不同逆境胁迫下StFBH3基因表达模式,结果表明, StFBH3基因在马铃薯根和叶中的表达量较高,且该基因的表达受渗透、高盐和脱落酸(abscisic acid, ABA)诱导;以过表达StFBH3基因的马铃薯试管苗为材料,在分别含有不同浓度甘露醇(mannitol)、NaCl和ABA的MS培养基中,过表达StFBH3马铃薯株系的叶绿素含量显著高于野生型,根长显著长于野生型。在干旱和高盐处理下,土壤栽培的过表达马铃薯株系较野生型表现较强的耐受性,叶片相对含水量、叶绿素含量和过氧化物歧化酶(SOD)活性显著高于野生型。qPCR分析发现,干旱和盐胁迫处理下相关基因(KAT1)的表达量在过表达马铃薯株系中较野生型显著降低。以上结果表明, StFBH3基因可能在马铃薯对渗透、干旱和高盐等胁迫响应中起正向调控作用。本研究也为StFBH3基因在马铃薯中的生物学功能深入理解提供一定的参考依据。

关键词：马铃薯 StFBH3 转录因子逆境胁迫

De novo synthesis of atropisomeric benzofurans via Cu/SPDO complex catalyzed asymmetric formal [3 + 2] annulation

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第01期 174-180页

作者： Fan-Xiao Meng Xing-Yu Wang Ka Lu Ju-song Yang Fu-Min Zhang Ai-Jun Ma Bao Du yong-Qiang Tu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University School of Biotechnology and Health Sciences Wuyi University

Herein, the de novo synthesis of atropisomeric benzofurans through the Cu/spirocyclic-pyrrolidine-oxazoline(SPDO) complex catalyze asymmetric formal [3 + 2] cycloaddition between quinones and ynamides is explored, producing a range of structurally diverse axially chiral benzofurans in satisfactory yields with good to excellent enantioselectivities. Furthermore, density functional theory calculations were applied to explain the possible reaction mechanism.

关键词：

Heuristic Expanding Disconnected Graph:A Rapid Path Planning Method for Mobile Robots

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2024年第2期37卷 68-82页

作者： yong Tao Lian duan He Gao Yufan Zhang Yian song Tianmiao Wang School of Mechanical Engineering&Automation Beihang UniversityBeijing 100191China Aero-Engine Research Institute Beihang UniversityBeijing 102206China School of Large Aircraft Engineering Beihang UniversityBeijing 100191China

Existing mobile robots mostly use graph search algorithms for path planning,which suffer from relatively low planning efficiency owing to high redundancy and large computational *** to the limitations of the neighborhood search strategy,the robots could hardly obtain the most optimal global path.A global path planning algorithm,denoted as EDG*,is proposed by expanding nodes using a well-designed expanding disconnected graph operator(EDG)in this ***,all obstacles are marked and their corners are located through the map ***,the EDG operator is designed to find points in non-obstruction areas to complete the rapid expansion of disconnected ***,the EDG*heuristic iterative algorithm is *** selects the candidate node through a specific valuation function and realizes the node expansion while avoiding collision with a minimum *** planning experiments were conducted in a typical indoor environment and on the public dataset *** result shows that the proposed EDG*reduced the planning time by more than 90%and total length of paths reduced by more than 4.6%.Compared to A*,Dijkstra and JPS,EDG*does not show an exponential explosion effect in map *** EDG*showed better performance in terms of path smoothness,and collision *** shows that the EDG*algorithm proposed in this paper can improve the efficiency of path planning and enhance path quality.

关键词： Global path planning Mobile robot Expanding disconnected graph Edge node Offset

Deciphering the molecular mechanisms of Simiaowan in the treatment of hyperuricemia: in vivo and in silico approaches

在线全文

学校读者我要写书评

暂无评论

Traditional Medicine Research 2025年第2期10卷 37-54页

作者： yong-Chang Zeng Jun-Hong Wu Dan-Dan Xu Kang He Chang-Qing Liu Li-Fei song Zheng-Zhi Wu Qian-Qian Jiang Shao-Yu Liang Department of Neurology The First Affiliated Hospital of Shenzhen UniversityShenzhen 518020China Pharmaceutical Department The Affiliated TCM Hospital of Guangzhou Medical UniversityGuangzhou 510000China School of Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China Guangzhou Zeli Medical Technology Co. Ltd.Guangzhou 510700China

Background:Simiaowan(SMW),a well-known traditional Chinese medicine,has been employed to treat hyperuricemia(HUA)and gout for ***,the bioactive components and underlying mechanisms have not been *** objective of this study was to identify the active components and potential mechanisms of SMW by integrating pharmacological experimentation,serum pharmacochemistry,network pharmacology and molecular ***:HUA rats modelling by high-fat/high-sugar diet and potassium oxonate/adenine oral administration were used to evaluate the pharmacodynamic effects of ***-Q-Exactive-MS/MS was employed to detect the bioactive components present in SMW-containing *** pharmacology and molecular docking were utilized to elucidate the potential targets and underlying ***:SMW effectively ameliorated HUA rats via the inhibition of uric acid(UA)production,promotion of UA excretion,improvement of lipid and glucose metabolic abnormalities,antioxidant,anti-inflammatory and anti-insulin resistance effects.A total of 73 compounds detected in SMW-containing serum were identified as potential active components,with alkaloids,flavonoids,organic acids,and terpenoids emerging as the primary active *** 203 corresponding targets were obtained as SMW anti-HUA/gout targets,which mainly participated in apoptosis,insulin resistance,TNF,PI3K-Akt,HIF-1,NF-κB,MAPK,IL-17 and TLR signaling *** docking indicated that active compounds(***,phellodendrine,quercetin,formononetin,ferulic acid)had superior binding abilities to the key targets(*** carrier family 22 member 12(URAT1),solute carrier family 22 member 6(OAT1),ATP-binding cassette sub-family G member 2(ABCG2),solute carrier family 2,facilitated glucose transporter member 9(GLUT9),xanthine dehydrogenase/oxidase(XDH),transcription factor p65(RELA),toll-like receptor 4(TLR4),prostaglandin G/H synthase 2(PTGS2),caspase-3(CASP3),insulin(INS)).Conclusion:S

关键词： hyperuricemia network pharmacology serum pharmacochemistry Simiaowan UPLC-Q-Exactive-MS/MS

First-principles calculations of optical properties of Mg_2Pb

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

Science China(Physics,Mechanics & Astronomy) 2014年第2期57卷 233-238页

作者： duan yongHua SUN yong School of Material Science and Technology Kunming University of Science and Technology Key Lab of Advanced Materials of Yunnan Province Kunming University of Science and Technology

Based on the density functional theory （DFT）, the electronic structures and optical properties of Mg2Pb are calculated by using the local density approximation （LDA） and plane wave pseudo-potential method. The calculation results show that the indirect band gap width of Mg2Pb is 0.02796 eV. The optical properties of MgzPb have isotropic characteristics, the static dielectric function of Mg2Pb is ε1（0） = 10.33 and the refractive index is n0 = 3.5075. The maximum absorption coefficient is 4.8060×10^5 cm-1. The absorption in the photon energy range of 25-40 eV approaches to zero, shows the optical colorless and transparent behaviors.

关键词： first-principles Mg2Pb electronic structure optical properties

Thermodynamics properties and thermal conductivity of Mg_2Pb at high pressure

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2013年第10期56卷 1854-1860页

作者： duan yongHua SUN yong Faculty of Material Science and Technology Kunming University of Science and Technology Key Lab of Advanced Materials of Yunnan Province Kunming University of Science and Technology

The thermodynamics properties and thermal conductivity of Mg2Pb at high pressures have been calculated by *** enthalpy of formation and heat capacity obtained at 0 GPa are in good agreement with the experiments and other theoretical *** thermal conductivity and coefficient of thermal expansion of Mg2 Pb at high pressure were *** thermal conductivity presents a second-order polynomial with *** calculated thermal conductivity of Mg2Pb indicates that it is suitable to be used as thermal conductor at 0 K.

关键词： thermodynamics properties thermal conductivity first-principles Mg2Pb