检索结果-南通市图书馆

Burrow Characteristics and Microhabitat Use of the Turpan Wonder Gecko Teratoscincus roborowskii (Squamata, Gekkonidae)

在线全文

学校读者我要写书评

暂无评论

Asian Herpetological Research 2017年第1期18卷 61-69页

作者： yucheng song Yang LIU Yingying LIN Tao LIANG Lei SHI College of Animal Science Xinjiang Agricultural University Urumqi 830052 Xinjiang China Hunan East Dongting Lake National Nature Reserve Yueyang 414000 Hunan China Chengdu Zoo Chengdu 610081 Sichuan China

Burrow structural charactersitcs and microhabitat use of the Turpan wonder gecko Teratoscincus roborowskii （Gekkonidae） were studied between April and September of 2013 in the Turpan Eremophytes Botanic Garden, in the Turpan Depression of Western China. Burrow depth, entrance orientation, entrance height and width were observed. We assessed microhabitat selection and noted differences in microhabitat use among males, females, and juveniles. The magnitude of selection was measured using Jacobs＇ index of selectivity. Entrance height and width of the burrows of adults were significantly larger than those of juveniles, but the difference in burrow depth was not significant. The directional orientation of the burrow entrance showed a preference for the north-northeast and south-southeast, which were likely influenced by local prevailing winds and sunlight. Both the adult and juvenile geckos prefer to construct their burrows in sandy soil within a layer of loose soil whose thickness is greater than 30 cm. A majority of the burrows were located within 20 m of the nearest plant. Nearly half （48%） of the entrances of juveniles were located within 5 m of the nearest vegetation, significantly different from those of the adults. Results showed that the Turpan wonder gecko did not utilize microhabitats according to their availability, but rather that it preferred rnicrohabitats which contained dead wood or the caper bush. Our results suggested that burrow characteristics and microhabitat selection were important factors in T. roborowskii adaptation to harsh and arid desert habitats.

关键词： arid desert habitat burrow depth entrance height entrance orientation entrance width microhabitatselection retreat site

Back in time:digital restoration techniques for the millennium Dunhuang murals

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2022年第2期29卷 13-23页

作者： Tao Yifeng song yucheng Xu Mengqiu Zhang Chuang Wu Ming Bai Sule School of Artificial Intelligence Beijing University of Posts and TelecommunicationsBeijing 100876China School of Computer Science(National Pilot Software Engineering School) Beijing University of Posts and TelecommunicationsBeijing 100876China

In the long history of more than 1 500 years,Dunhuang murals suffered from various deteriorations causing irreversible damage such as falling off,fading,and so ***,the existing Dunhuang mural restoration methods are time-consuming and not feasible to facilitate cultural dissemination and permanent *** by cultural computing using artificial intelligence,gated-convolution-based dehaze net(GD-Net) was proposed for Dunhuang mural refurbishment and comprehensive ***,a neural network with gated convolution was applied to restore the falling off areas of the mural to ensure the integrity of the mural ***,a dehaze network was applied to enhance image quality to cope with the fading of the ***,a Dunhuang mural dataset was presented to meet the needs of deep learning approach,containing 1 180 images from the Cave 290 and Cave 112 of the Mogao *** experimental results demonstrate the effectiveness and superiority of GD-Net.

关键词： image inpainting image enhancement mural restoration

Hollow Zn/Co zeolitic imidazolate framework-implanted composite hydrogel for highly efficient uranium extraction from seawater

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 10451-10461页

作者： yucheng song Xin Ma Huanhuan Tan Zhong Liu Chuntai Liu Changyu Shen Peipei Yang songwei Li National Engineering Research Center for Advanced Polymer Processing Technology Key Laboratory of Materials Processing and Mold(Ministry of Education)Zhengzhou UniversityZhengzhou 450002China Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Henan Tuoren Medical Device Co. Ltd.Weiyuan Industrial ParkChangyuan 453400China

Efficient capture of uranium(VI)(U(VI))from seawater is of great significance to the sustainable development of nuclear energy and environmental protection,which is also a serious challenge at *** this study,hollow Zn/Co zeolitic imidazolate framework(H-ZIF)was decorated on polyacrylamide/sodium alginate(PAM/SA)hydrogel by chelating and covalently crosslinking,and a new type of PAM/SA/H-ZIF hydrogel was *** combination of PAM/SA and H-ZIF gives PAM/SA/H-ZIF hydrogel excellent mechanical properties,good stability,and abundant surface functional groups,which is beneficial to improving the adsorption *** extraction amount of U(VI)by PAM/SA/H-ZIF is 171.14 mg·g^(-1)at C_(0)=99.52 mg·L^(-1)and pH=*** adsorption equilibrium is reached in 120 min and the adsorption process fits well with Langmuir isotherm model and pseudo-second-order rate *** PAM/SA/H-ZIF also showed good recyclability and stability after 10 cycles of *** importantly,the rate of uranium adsorption is 0.196 mg·g^(-1)·day^(-1)after 30 days,which implies that the PAM/SA/H-ZIF could serve as a potential adsorbent for the development of uranium capture from seawater.

关键词： hydrogel hollow metal-organic framework uranium capture seawater

Assembly of a core–shell MOF with stability into polyacrylamide hydrogel for boosting extraction of uranium from seawater

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

Nano Research 2024年第4期17卷 3398-3406页

作者： yucheng song Huanhuan Tan Shiliang Qin Zhong Liu Chuntai Liu Changyu Shen Peipei Yang songwei Li National Engineering Research Center for Advanced Polymer Processing Technology Key Laboratory of Materials Processing and Mold(Ministry of Education)Zhengzhou UniversityZhengzhou 450002China Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China

Efficient and selective extraction of uranium(U(VI))from seawater is essential for sustainable nuclear power *** study reports a novel adsorbent zeolitic imidazolate framework(ZIF)-67@SiO_(2)-A/polyacrylamide(PAM)which was synthesized by grafting the core–shell metal–organic frameworks(MOFs)-based nanostructures coated with the 3-aminopropyl triethoxysilane(APTES)functionalized SiO_(2)(SiO_(2)-A)onto PAM *** SiO_(2) shell was grown on the surface of MOF,which improved the acid-base resistance of *** introduction of ZIF-67@SiO_(2)-A enhances the specific surface area and adsorption efficiency of the *** ZIF-67@SiO_(2)-A/PAM shows remarkable adsorption capacity,fast adsorption kinetics,and good reusability for *** has excellent adsorption property(6.33 mg·g^(-1),30 d)in natural *** X-ray photoelectron spectroscopy(XPS),Fourier transform infrared(FTIR),energy dispersive spectroscopy(EDS)mappings,and density functional theory reveal that the coordination by N and O in ZIF-67@SiO_(2)-A/PAM with uranium is the main mechanism of uranium ***,ZIF-67@SiO_(2)-A/PAM has great potential to capture uranium from natural seawater.

关键词： hydrogel metal–organic frameworks core–shelled nanostructures uranium extraction from seawater

Synergistic effects of brain-derived neurotrophic factor and retinoic acid on inducing the differentiation of bone marrow stromal cells into neuron-like cells in adult rats in vitro

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

Neural Regeneration Research 2006年第4期1卷 301-303页

作者： Yonghai Liu yucheng song Zunsheng Zhang Xia Shen Department of Neurology Affiliated Hospital of Xuzhou MedicalCollege Xuzhou 221002Jiangsu Province China

BACKGROUND： Under induction of retinoic acid （RA）, bone marrow stromal cells （BMSCs） can differentiate into nerve cells or neuron-like cells, which do not survive for a long time, so those are restricted to an application. Other neurotrophic factors can also differentiate into neuronal cells through inducing BMSCs; especially, brain-derived neurotrophic factor （BDNF） can delay natural death of neurons and play a key role in survival and growth of neurons. The combination of them is beneficial for differentiation of BMSCs. OBJECTIVE： To investigate the effects of BDNF combining with RA on inducing differentiation of BMSCs to nerve cells of adult rats and compare the results between common medium group and single BDNF group. DESIGN： Randomized controlled animal study SETTING： Department of Neurology, Affiliated Hospital of Xuzhou Medical College MATERIALS： The experiment was carried out in the Clinical Neurological Laboratory of Xuzhou Medical College from September 2003 to April 2005. A total of 24 SD rats, of either gender, 2 months old, weighing 130-150 g, were provided by Experimental Animal Center of Xuzhou Medical College [certification： SYXK （su） 2002-0038]. Materials and reagents： low-glucose DMEM medium, bovine serum, BDNF, RA, trypsin, separating medium of lymphocyte, monoclonal antibody of mouse-anti-nestin, neuro-specific enolase, glial fibrillary acidic protein （GFAP） antibody, SABC kit, and diaminobenzidine （DAB） color agent. All these mentioned above were mainly provided by SIGMA Company, GIBCO Company and Boshide Company. METHODS： Bone marrow of SD rats was selected for density gradient centrifugation. BMSCs were undertaken primary culture and subculture; and then, those cells were induced respectively in various mediums in total of 3 groups, including control group （primary culture）, BDNF group （20 μg/L BDNF） and BDNF＋RA group （20 μg/L BDNF plus 20 μg/L RA）. On the 3^rd and the 7^th days after induction, BMSCs were stained immunocytochemically

关键词： cell bone Synergistic effects of brain-derived neurotrophic factor and retinoic acid on inducing the differentiation of bone marrow stromal cells into neuron-like cells in adult rats in vitro BMSCs BDNF acid

Unequal Error Protection Based on Expanding Window Fountain for Object-Based 3D Audio

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2017年第4期22卷 323-328页

作者： YANG Cheng HU Ruimin song yucheng SU Liuyue WANG Xiaochen CHEN Wei National Engineering Research Center for Multimedia Software/School of Computer Science Wuhan UniversityWuhan 430072HubeiChina Hubei Key Laboratory of Multimedia and Network Communication Engineering(Wuhan University) Wuhan 430072HubeiChina Research Institute of Wuhan University in Shenzhen Shenzhen 518000GuangdongChina School of Physics and Electronic Science Guizhou Normal UniversityGuiyang 550001GuizhouChina

This paper proposes an unequal error protection（UEP）coding method to improve the transmission performance of three-dimensional（3D）audio based on expanding window fountain（EWF）.Different from other transmissions with equal error protection（EEP）when transmitting the 3D audio *** approach of extracting the important audio object is presented,and more protection is given to more important audio object and comparatively less protection is given to the normal audio *** and subjective experiments have shown that the proposed UEP method achieves better performance than equal error protection method,while the bits error rates（BER）of the important audio object can decrease from 10^（–3） to 10^（–4）,and the subjective quality of UEP is better than that of EEP by 14%.

关键词： object-based 3D audio unequal error protection equal error protection

WT-FCTGN:A wavelet-enhanced fully connected time-gated neural network for complex noisy traffic flow modeling

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第7期33卷 652-664页

作者：廖志芳孙轲刘文龙余志武刘承光宋禹成 School of Computer Science and Engineering Central South UniversityChangsha 410083China National Engineering Research Center of High-speed Railway Construction Technology Changsha 410075China School of Civil Engineering Central South UniversityChangsha 410075China School of Traffic&Transportation Engineering Central South UniversityChangsha 410083China

Accurate forecasting of traffic flow provides a powerful traffic decision-making basis for an intelligent transportation system. However, the traffic data's complexity and fluctuation, as well as the noise produced during collecting information and summarizing original data of traffic flow, cause large errors in the traffic flow forecasting results. This article suggests a solution to the above mentioned issues and proposes a fully connected time-gated neural network based on wavelet reconstruction(WT-FCTGN). To eliminate the potential noise and strengthen the potential traffic trend in the data, we adopt the methods of wavelet reconstruction and periodic data introduction to preprocess the data. The model introduces fully connected time-series blocks to model all the information including time sequence information and fluctuation information in the flow of traffic, and establishes the time gate block to comprehend the periodic characteristics of the flow of traffic and predict its flow. The performance of the WT-FCTGN model is validated on the public Pe MS data set. The experimental results show that the WT-FCTGN model has higher accuracy, and its mean absolute error(MAE), mean absolute percentage error(MAPE) and root mean square error(RMSE) are obviously lower than those of the other algorithms. The robust experimental results prove that the WT-FCTGN model has good anti-noise ability.

关键词： traffic flow modeling time-series wavelet reconstruction

在线全文

学校读者我要写书评

暂无评论

资本市场周期结构特征的识别与制度解释

新金融 2020年第8期 34-39页

作者：张晗宋玉臣北京大学国家发展研究院博士后流动站吉林大学数量经济研究中心暨商学院

资本市场注册制的渐进推行,不仅会引起社会融资结构进一步向以资本市场为主导的直接融资方式转型,更是多年来资本市场制度改革成果累积的体现。回顾历史,与其他外生因素相比,我国资本市场的演进更多驱动于制度变迁,而资本市场的周期运... 详细信息

资本市场注册制的渐进推行,不仅会引起社会融资结构进一步向以资本市场为主导的直接融资方式转型,更是多年来资本市场制度改革成果累积的体现。回顾历史,与其他外生因素相比,我国资本市场的演进更多驱动于制度变迁,而资本市场的周期运转则直接反映出这一进程。为此,本文基于MS-AR模型对我国资本市场周期的结构特征进行识别发现,我国资本市场结构特征的演进出现了资本市场周期长度缩短、波动幅度减弱以及非对称性减弱的特征,而繁荣区制的出现其实对应于我国资本市场改革的三个关键时期,即资本市场制度探索期、资本市场市场化改革期和资本市场国际化期。

关键词：资本市场周期结构特征制度解释 MS-AR

在线全文

学校读者我要写书评

暂无评论

跨模态域自适应SAR图像舰船检测与识别

华中科技大学学报（自然科学版） 2022年第11期50卷 107-113页

作者：宋玉成李景润田甜田金文华中科技大学人工智能与自动化学院湖北武汉430074 华中科技大学多谱信息处理技术国家级重点实验室湖北武汉430074

针对合成孔径雷达(SAR)数据成像质量差和标注不足的问题,提出一种跨模态域自适应端到端的SAR图像舰船目标检测与识别方法.首先,针对SAR舰船检测中目标特征辨识度低和背景信息复杂度高的问题,设计了融合多尺度特征和局部上下文信息及背... 详细信息

针对合成孔径雷达(SAR)数据成像质量差和标注不足的问题,提出一种跨模态域自适应端到端的SAR图像舰船目标检测与识别方法.首先,针对SAR舰船检测中目标特征辨识度低和背景信息复杂度高的问题,设计了融合多尺度特征和局部上下文信息及背景抑制来改进兴趣区域变换网络(RoITransformer)的特征表达能力;然后,针对SAR数据属性标签标注困难及样本缺乏的问题,设计了域适应模块在全局和实例级别实现对齐特征,将属性知识从光学数据跨模态迁移到SAR数据上.自建了近岸区域高分辨率SAR舰船数据集(HRSSRD),结果表明:所提方法在HRSSRD上实现了88.5%的检测精度,在舰船检测和军民识别任务上具有良好的性能.

关键词：舰船检测军民舰船识别合成孔径雷达(SAR)图像迁移学习域自适应