检索结果-南通市图书馆

同方期刊数据库

不同Gd_2O_3含量的UO_2芯块工艺研究

在线全文

学校读者我要写书评

暂无评论

核动力工程 1989年第3期10卷 79-83页

作者：戴受惠李继生邱邦臣朱树明卢怀昌西南反应堆工程研究设计院

本文研究了混料条件对 UO_2-Cd_2O_3弥散均匀性的影响;在 UO_2中加入0—10Wt% Gd_2O_3对UO_2芯块的生坯密度、烧结密度、晶粒尺寸及组织结构的影响,为生产各种不同 Gd_2O_3含量的可燃毒物燃料芯块提供了较系统的工艺参数。

关键词：三氧化二钆芯块弥散均匀性工艺

New insights into the life history of Monochamus saltuarius(Cerambycidae:Coleoptera)can enhance surveillance strategies for pine wilt disease

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2021年第6期32卷 2699-2707页

作者： Min Li Yun dai Yang Wang Lichao Wang shouhui Sun Fengmao Chen Co-Innovation Center for Sustainable Forestry in Southern China College of ForestryNanjing Forestry UniversityNanjing 210037China College of Forestry Shenyang Agricultural UniversityShenyang 110866China

Pine wilt disease was first discovered in Dongtang town,Liaoning Province,China,in *** saltuarius Gebler is a new vector of pinewood nematode and the only known vector in Liaoning *** biology of this pest has not been reported thus far;therefore,it is necessary to study its life *** 2018 and 2019,we collected 138 and 491 adult *** beetles,respectively,to analyze their eclosion from larva to adult *** mid-March,overwintering larvae began to feed(on xylem)and seek nutrition in preparation for pupation and *** adults began to appear in mid-April,and the population reached its peak in late *** life span of the adults was 28-76 *** approximately 1 week of supplemental nutrition(feeding on twigs),adults began to mate and lay *** egg stage of *** lasted 4-8 *** larvae in Dongtang town have 4 instars and overwinter in tunnels as 3rd-4th *** 1st-instar stage lasted 3-9 days,the 2nd-instar stage lasted 11-23 days,the 3rd-instar stage lasted 30-130 days,and the 4th-instar stage lasted 44-180 *** pupal stage lasted 7-12 days,and the life span of the adults was 28-76 *** this study we systematically monitored the life history of *** for the first *** objective was to lay a foundation for improving control of this pinewood nematode vector.

关键词： Bursaphelenchus xylophilus China Pine sawyer Life cycle Vector

High-performance supercapacitor based on ultralight and elastic three-dimensional carbon foam/reduced graphene/polyaniline nanocomposites

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第6期30卷 1137-1140页

作者： Canwei Peng Jie Yu shouhui Chen Li Wang Key Laboratory of Functional Small Organic Molecule Key Laboratory of Chemical BiologyCollege of Chemistry and Chemical Engineering Jiangxi Normal University

A novel supercapacitor based on ultralight and elastic three-dimensional (3D) porous melamine foam (MF)-derived macroporous carbon (3DPMFDMC)/reduced graphene oxide (rGO)/polyaniline (PANI) nanocomposites (denoted as 3DPMFDMC/rGO/PANI) were fabricated. By high temperature carboniza-tion, the commercial MF soaked in GO solution was prepared into ultralight and elastic 3DPMFDMC, the rGO were uniformly distributed into 3DPMFDMC to obtain 3DPMFDMC/rGO, and finally PANI was grown on the 3DPMFDMC/rGO by using in situ chemical oxidation polymerization method. The obtained 3DPMFDMC/rGO/PANI nanocomposites were characterized by SEM, FT-IR and Raman. The results showed the uniform distribution of rGO connected the broken fibers of 3DPMFDMC produced in the high temperature carbonization to improve the electrical conductivity and also enlarged the specific surface area of nanocomposites greatly. Lots of PANI were vertically arrayed on the surface of 3DPMFDMC/rGO. 3DPMFDMC/rGO/PANI exhibited a rapid electron/mass transport. Owing to its special structures and nanocomposites, the supercapacitor showed good electrical performance with a specific capacitance of 1870 F/g at the current density of 1 A/g. Moreover, the specific capacitance remained 95.4%after 1000 charging/discharging cycles at a current density of 5 A/g.

关键词： Polyaniline Supercapacitors Melamine foam Macroporous carbon Reduced graphene oxide

Dynamic ensemble selection of convolutional neural networks and its application in flower classification

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2022年第1期15卷 216-223页

作者： Zhibin Wang Kaiyi Wang Xiaofeng Wang shouhui Pan Xiaojun Qiao Information Technology Research Center Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China National Engineering Research Center for Information Technology in Agriculture Beijing 100097China

In recent years,convolutional neural networks(CNNs)have achieved great success in image ***,CNN models usually have complex network structures that tend to cause some related problems,such as redundancy of network parameters,low training efficiency,overfitting,and weak generalization *** solve these problems and improve the accuracy of flower classification,the advantages of CNNs were combined with those of ensemble learning and a method was developed for the dynamic ensemble selection of ***,MobileNet models pre-trained on a public dataset were transferred to flower datasets to train thirteen different MobileNet classifiers,and a resampling strategy was used to enhance the diversity of individual ***,the thirteen classifiers were sorted by a classifier sorting algorithm,before ensemble selection,to avoid an exhaustive ***,with the credibility of recognition results,a classifier subset was dynamically selected and integrated to identify the flower species from their *** verify the effectiveness,the proposed method was used to classify the images of five flower *** accuracy of the proposed method was 95.50%,an improvement of 1.62%,3.94%,22.04%,13.77%,and 0.44%,over those of MobileNet,Inception-v1,ResNet-50,Inception-ResNet-v2,and the linear ensemble method,*** addition,the performance of the proposed method was compared with five other methods for flower *** experimental results demonstrated the accuracy and robustness of the proposed method.

关键词： flowers classification convolutional neural network dynamic ensemble selection

Image segmentation of overlapping leaves based on Chan–Vese model and Sobel operator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2018年第1期5卷 1-10页

作者： Zhibin Wang Kaiyi Wang Feng Yang shouhui Pan Yanyun Han Beijing Research Center for Information Technology in Agriculture Beijing 100097China National Engineering Research Center for Information Technology in Agriculture Beijing 100097China Key Laboratory of Agri-informatics Ministry of Agriculture of ChinaBeijing 100097China School of Economics&Management China Agricultural UniversityBeijing 100083China

To improve the segmentation precision of overlapping crop leaves,this paper presents an effective image segmentation method based on the Chan–Vese model and Sobel *** approach consists of three ***,a feature that identifies hues with relatively high levels of green is used to extract the region of leaves and remove the ***,the Chan–Vese model and improved Sobel operator are implemented to extract the leaf contours and detect the edges,***,a target leaf with a complex background and overlapping is extracted by combining the results obtained by the Chan–Vese model and Sobel *** verify the effectiveness of the proposed algorithm,a segmentation experiment was performed on 30 images of cucumber *** mean error rate of the proposed method is 0.0428,which is a decrease of 6.54%compared with the mean error rate of the level set *** results show that the proposed method can accurately extract the target leaf from cucumber leaf images with complex backgrounds and overlapping regions.

关键词： Leaf segmentation Sobel operator Overlapping leaves Chan–Vese model Image fusion

Image enhancement for crop trait information acquisition system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2018年第4期5卷 433-442页

作者： Zhibin Wang Kaiyi Wang Feng Yang shouhui Pan Yanyun Han Xiangyu Zhao Beijing Research Center for Information Technology in Agriculture Beijing 100097China National Engineering Research Center for Information Technology in Agriculture Beijing 100097China School of Economics&Management China Agricultural UniversityBeijing 100083China

Collecting images using portable devices is an effective and convenient method for acquiring crop trait *** of uncertain environmental conditions in the field,enhancement is necessary to improve the visual quality of *** this aim,here we propose an adaptive image enhancement method based on guided *** method automatically calculates the enhancement weights of the detail in an image according to the distribution characteristics of the illumination intensity of a crop image,so as to adaptively adjust the contrast of the *** verify the effectiveness of the proposed algorithm,we performed enhancement experiments on 50 images of four kinds of cucumber leaf tissues,namely,leaves infected with target spot,powdery mildew,and downy mildew,and healthy *** results showed that our proposed method substantially improved the visual quality of the ***,the mean ratios of the contrast to color difference obtained using the proposed method were higher than the mean ratios obtained using five conventional enhancement *** consider the proposed method for image enhancement will be a valuable addition to the crop trait information acquisition system(http://***/).

关键词： Cucumber leaves Uneven illumination Detail enhancement Adaptive Guided filtering Breeding

Au@Ag-labeled SERS lateral flow assay for highly sensitive detection of allergens in milk

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2023年第3期12卷 912-919页

作者： Jing Li Jia Xu Yi Pan Yongzhi Zhu Yuanfeng Wang shouhui Chen Xinlin Wei Department of Food Science and Technology School of Agriculture and BiologyShanghai Jiao Tong UniversityShanghai 200240China Institute of Food Engineering College of Life ScienceShanghai Normal UniversityShanghai 200234China

Casein andα-lactalbumin(α-LA)are the main allergens in cow's milk,which can affect the skin,respiratory system,and gastrointestinal tract,even cause anaphylactic *** a rapid and sensitive detection method of casein andα-LA is still ***,a surface-enhanced Raman scattering based lateral flow assay(SERS-LFA)method for rapid and highly sensitive detection of milk allergens in food was established for effectively preventing allergic ***@silver nanoparticles(Au@Ag NPs)were synthesized as SERS active substrate to prepare the antibody-modified SERS Probe and SERS-LFA strips toward casein andα-LA were assembled according to the sandwich *** detection results were calculated according to colorimetric and Raman *** introduction of SRES signal significantly increased the sensitivity of detection with the limit of detection(LOD)of 0.19 ng/mL and 1.74 pg/mL,and exhibited an excellent linear relationship within the range of 0.55-791.50 ng/mL and 0.1 pg/mL-100.0 ng/mL for casein andα-LA,***,SERS-LFA strips was highly specific with the recovery rates for corresponding80.36%-105.12%and 85.73%-118.22%for casein andα-LA,***,the SERS-LFA could be in great potential to develop a unique allergen detection method.

关键词： Casein α-Lactalbumin Au@AgNPs SERS-LFA

Effect of long-term cyclic compression loading on the structural evolution of trabecular bone

在线全文

学校读者我要写书评

暂无评论

Medicine in Novel Technology and Devices 2021年第4期12卷 69-76页

作者： Yan Gao Feixiang Lu shouhui Wang Lianwen Sun Huijie Leng Bo Huo Biomechanics Lab Department of MechanicsSchool of Aerospace EngineeringBeijing Institute of TechnologyChina Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical EngineeringBeihang UniversityChina Department of Orthopaedics Peking University Third HospitalChina

Dynamic remodeling of bone tissue is mediated by the synergistic effects of osteoblast-driven bone formation and Osteoclast-dominated bone ***,how bone cells perceive the mechanical stimuli and regulate bone remodeling have not been fully *** study aims to evaluate the effect of cyclic compression loading on trabecular microstructure for 42 days and identify the relationship between the evolution of trabecular microstructure and cell *** eighth caudal vertebrae of rats were subjected to long-term cyclic compression loading with different *** compression displacement is 1 *** vivo micro-computed tomography was performed at 0,14,28 and 42 days to determine the structural *** bone volume fraction(BV/TV)in the 1 Hz cyclic compression loading group was significantly higher than that in the control and 10 Hz groups,whereas the trabecular separation(***)was significantly *** 10 Hz cyclic compression group had the lowest BV/TV and highest *** 14 days of loading,the BV/TV values of 1 Hz group were 29.62%and 41.6%higher than those of the control and 10 Hz groups,***,the *** of 1 Hz group was approximately 12.33%and 16.52%lower than that of the control and 10 Hz group,*** bone formation and less bone resorption were observed in the 1 Hz group than the control *** addition,more osteoblasts were attached to the area of bone formation,while more osteoclasts were located in the area of bone *** findings may provide a basis for further understanding mechanical stimulation-regulated bone remodeling.

关键词： Bone remodeling Osteoclast Osteoblast Cyclic compression loading Micro-computed tomography

Changes of cortical bone pores structure and their effects on mechanical properties in tail-suspended rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Medicine in Novel Technology and Devices 2022年第4期16卷 220-227页

作者： shouhui Wang Xiao Yang Zhuang Han Xintong Wu Yu-Bo Fan Lian-Wen Sun Key Laboratory for Biomechanics and Mechanobiology(Beihang University) Ministry of EducationBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100083China

Cortical bone is the main mechanical bearing structure of bone,and the mechanical properties of materials are not only related to bone mineral density,but also largely depend on its pores microstructure which affected by blood ***,the change of pores structure in cortical bone under microgravity was still *** this study,in order to clear the changes of pore structure with cortical vascular pores and its effect on bone mechanical properties,rat tail-suspension was used to simulate microgravity and the changes of the microstructure in rat tibia cortices were investigated by high-resolution micro-CT(3μm)while the bone mechanical properties were measured via three point bending *** results showed the bone mineral density of cortical bone didn't change in tail-suspended ***,the pore structure of cortical bone in tail-suspended rats changed significantly,the proportion of pores greater than 15μm(cortical vascular pores)increased while that less than 15μm *** mechanical properties of bone(such as maximum load and maximum stress)in tail-suspended rats *** the volume ratio of pore vessels(vessel volume/tissue volume)was negatively correlated with the mechanical *** conclusion,the increase of cortical vascular pores in rats caused by the simulated microgravity contributes to the decrease of mechanical properties.

关键词： Pores microstructure Cortical vascular pores Bone loss Microgravity