检索结果-南通市图书馆

Encoding syntactic representations with a neural network for sentiment collocation extraction

Science China(Information Sciences) 2017年第11期60卷 7-18页

作者： yanyan zhao Bing QIN Ting LIU Department of Media Technology and Art Harbin Institute of Technology Department of Computer Science and Technology Harbin Institute of Technology

Sentiment collocation refers to the collocation of a target word and a polarity word. Sentiment collocation extraction aims to extract the targets and their modifying polarity words by analyzing the relationships between them. This can be regarded as a basic sentiment analysis task and is relevant in many practical applications. Previous studies relied mainly on the syntactic path, which is used to connect the target word and the polarity word. To deeply exploit the semantic information of the syntactic path, we propose two types of syntactic representation, namely, relation embedding and subtree embedding, to capture the latent semantic features. Relation embedding is used to represent the latent semantics between targets and their corresponding polarity words, and subtree embedding is used to explore the rich syntactic information for each word on the path. To combine the two types of syntactic representations, a neural network is constructed. We use a recursive neural network(RNN) to model the subtree embeddings, and then the subtree embedding and the word embedding are combined as the enhanced word representation for each word in the syntactic path. Finally,a convolutional neural network(CNN) is adopted to integrate the two types of syntactic representations to extract the sentiment collocations from reviews. Our experiments were conducted on six types of reviews, which included product domains(such as cameras and phones) and service domains(such as hotels and restaurants).The experimental results show that our proposed method can accurately capture the latent semantic features hidden behind the syntactic paths that neither the common feature-based methods nor the syntactic-path-based method can handle, and, further, that it significantly outperforms numerous baselines and previous methods.

关键词： sentiment collocation extraction sentiment analysis syntactic representation neural network re cursive neural network(RNN) convolutional neural network(CNN)

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rational design and synthesis of upconversion luminescence-based optomagnetic multifunctional nanorattles for drug delivery

引用

Chinese Journal of Chemical Engineering 2021年第10期34卷 286-293页

作者： Xuhua Liang yanyan zhao Min Cheng Fei Zhang College of Biology Pharmacy and Food Engineering Shangluo UniversityShangluo 726000China Shaanxi Qinling Industrial Technology Research Institute of Special Biological Resources Shangluo 726000China Shaanxi Tasly Plants Pharmaceutical Co. LtdShangluo 726000China

Optomagnetic multifunctional composite based on upconversion luminescence nanomaterial is regarded as a promising strategy for bioimaging,disease diagnosis and targeted delivery of *** explore a mesoporous nanostructure with excellent water dispersibility and high drug-loading capacity,a novel nanorattle-structured Fe3O4@SiO2@NaYF4:Yb,Er magnetic upconversion nanorattle(MUCNR)was successfully designed by using Fe3O4 as core and NaYF4:Yb,Er nanocrystals as *** microstructures and crystal phase of the as-prepared MUCNRs were evaluated by transmission electron microscopy,Xray powder diffraction and N2 adsorption/desorption *** Kirkendall effect was adapted to explain the formation mechanism of the *** loading content and encapsulation efficiency of doxorubicin hydrochloride(DOX)could reach as high as 18.2%and 60.7%,***,the DOX loading MUCNR(DOX-MUCNR)system showed excellent sustained drug release and strong p Hdependent performance,which was conducive to drug release at the slightly acidic microenvironment of *** was used to quantify the interactions between the carrier structure and drug release rate *** heat release rates in the heat-flow diagrams are basically consistent with the DOX release rate,thereby showing that microcalorimetry assay not only provides a unique thermodynamic explanation for the structure–activity relationship of Fe3O4@SiO2@NaYF4:Yb,Er MUCNRs but also provides powerful guidance to avoid the blind selection or design of drug ***,our work firmly provided a comprehensive perspective for using Fe3O4@SiO2@NaYF4:Yb,Er MUCNRs as a remarkable magnetic targeted drug carrier.

关键词： Optomagnetic nanocomposite Nanorattle Upconversion luminescence Iron oxide Drug delivery

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of NaYF_(4):Yb,Er upconversion nanoparticle-based optomagnetic multifunctional composite for drug delivery system

引用

Journal of Rare Earths 2021年第5期39卷 579-586页

作者： Xuhua Liang Jun Fan yanyan zhao Ruyi Jin College of Biology Pharmacy and Food Engineering Shangluo UniversityShangluo 726000China Shaanxi Qinling Industrial Technology Research Institute of Special Biological Resources Shangluo 726000China College of Food Science and Technology Northwest UniversityXi'an 710069China College of Pharmacy Shaanxi University of Chinese MedicineXianyang 712046China

Optomagnetic multifunctional composite has attracted much attention in recent years because of its promising application prospect in bioimaging,analysis,detection,disease diagnosis,and targeted drug *** explore a dual-targeted therapy for cancer,a novel class of optomagnetic multifunctional composite(UCNP-Fe_(3)O_(4)@MSNs-FA)was successfully synthesized by using upconversion nanoparticles(UCNPs)as nucleus,embedding Fe_(3)O_(4)nanoparticles into the SiO_(2)coating layer,and modifying the surface with folic acid(FA)to strengthen its tumor targeting *** properties of the composite were extensively *** obtained composite possesses excellent upconversion fluorescence,good dispersion,high specific surface area(229.347 m^(2)/g),and saturation magnetization value(10.9 A m^(2)/g).Its drug loading co ntent and encapsulation efficiency can reach as high as 14.2%and 47.3%,respectively,using doxorubicin hydrochloride(DOX)as model *** DOX-UCNP-Fe_(3)O_(4)@MSNs-FA system shows excellent sustained drug release and strong pH-dependent performance,in which the drug release would be accelerated at the slightly acidic microenvironment in the tumor;thus,the system can realize the targeted treatment of *** viability of L929 cells demonstrates the good biocompatibility of the ***,DOX-UCNP-Fe_(3)O_(4)@MSNs-FA exhibits specific cytotoxicity to folate receptor(FR)positive tumor cells,whereas DOX has weak toxicity to FR-negative ***,the as-prepared UCNP-Fe_(3)O_(4)@MSNs-FA can potentially be used as an anti-cancer targeted drug delivery system and enhance the therapeutic efficacy against FR-positive tumor cells.

关键词： Optomagnetic composite Targeted drug delivery system pH-responsive Upconversion luminescence Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Knowledge Argument against Physicalism： Its Proponents and Its Opponents

引用

Frontiers of Philosophy in China 2012年第2期7卷 304-316页

作者： zhao yanyan Department of Philosophy Fujian Academy of Social SciencesFuzhou 350001China

The knowledge argument usually takes the form of a thought experiment where the subject, having some psychological deficiency, lacks any introspective data to derive the knowledge of her experience. Most defenders of the knowledge argument see the argument as both a support of dualism and an objection to any full-blooded form of physicalism. However, this paper argues that the knowledge argument against physicalism may be directed, in an exactly parallel form, against reductive dualism; moreover, although most physicalists who are the opponents of the knowledge argument do not give any convincing response to the knowledge argument, some kinds ofphysicalism can live with the knowledge argument.

关键词： knowledge argument physicalism dualism

来源：

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

Trichosanthin Induced Th2 Polarization Status

引用

Cellular & Molecular Immunology 2006年第4期3卷 297-301页

作者： Shuying zhao yanyan Wang Haiming Wei School of Life Sciences University of Science and Technology of China Hefei 230027 Anhui China

Trichosanthin is extracted from the root tuber of Chinese medicinal herb Trichosanthes kirilowii maximowicz （Tian Hua Fen）. TCS has abortifacient, anti-tumor, anti-HIV and immunoregulatory functions. It has been proved that it could inhibit immune response and arouse a T helper 2 response in the draining lymph node. In the current study the effect of TCS on mouse splenocytes was investigated. We stimulated C57BL/6 mice with TCS both in vivo and in vitro and analyzed the change of type 1 and type 2 cytokines in mouse splenocytes. The results showed that TCS could induce the expression of IL-4, one of the major T helper 2 （Th2） cytokines, and inhibit the expression of IFN-γ, an important Thl cytokine in spleen lymphocytes both in vivo and in vitro. It is also shown the kinetics of Thl-to-Th2 transition after TCS stimulation in vivo in C57BL/6 mice. We found that type 2 cytokines, such as IL-10, TGF-β and IL-4 were increased regularly but IFN-γ, was decreased at day 3 and then increased. However the mechanism for cytokine change is not clear.

关键词： trichosanthin IL-4 IFN-γ Th

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Using light-level geolocations to monitor incubation behaviour of a cavity-nesting bird Apus apus pekinensis

引用

Avian Research 2021年第1期12卷 124-129页

作者： Xiao Huang yanyan zhao Yang Liu State Key Laboratory of Biocontrol School of Ecology/School of Life SciencesSun Yat-Sen UniversityGuangzhou 510275China

The Beijing Swift(Apus apus pekinensis)is a typical cavity-nesting bird that often nests inside holes and crevices in old *** observation of their breeding behaviour is challenging and their breeding ecology is thus poorly *** this study,we analysed light-level geolocation data collected from six Beijing Swifts for the first *** results showed that geolocators can make comprehensive inference of their incubation period and *** a cost-effective and non-invasive method,geolocators can not only facilitate discovering migration routes,but also can be widely applied in the study of avian reproductive behaviour,especially in cavity-nesting bird *** further discussed the characteristics and merits of this method and compared with other conventional nest-monitoring methods in recording birds.

关键词： Using light-level geolocations to monitor incubation behaviour of a cavity-nesting bird Apus apus pekinensis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Low-dimensional non-metal catalysts:principles for regulating p-orbital-dominated reactivity

引用

npj Computational Materials 2021年第1期7卷 1699-1732页

作者： Si Zhou Wei Pei yanyan zhao Xiaowei Yang Nanshu Liu Jijun zhao Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024China

Activation of p-block elements to replace the rare and precious transition metals for renewable energy applications is highly *** this review,we go over recent experimental and theoretical progress on the low-dimensional non-metal materials for clean energy production,including carbon,silicon,oxide,boron,and phosphorus-based nanostructures,with the p-block elements serving as active *** aim to elucidate the mechanism for triggering activity in different kinds of non-metal systems,and extract general principles for controlling the p-orbital-mediated reactivity from a theoretical point of *** perspectives and challenges for developing high-efficiency non-metal catalysts are provided in the end.

关键词： reactivity orbital principles

来源：

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

A syntactic path-based hybrid neural network for negation scope detection

引用

Frontiers of Computer Science 2020年第1期14卷 84-94页

作者： Lydia LAZIB Bing QIN yanyan zhao Weinan ZHANG Ting LIU Research Center for Social Computing and Information Retrieval Harbin Institute of TechnologyHarbin 150001China

The automatic detection of negation is a crucial task in a wide-range of natural language processing(NLP)applications,including medical data mining,relation extraction,question answering,and sentiment *** this paper,we present a syntactic path-based hybrid neural network architecture,a novel approach to identify the scope of negation in a *** hybrid architecture has the particularity to capture salient information to determine whether a token is in the scope or not,without relying on any human *** approach combines a bidirectional long shortterm memory(Bi-LSTM)network and a convolutional neural network(CNN).The CNN model captures relevant syntactic features between the token and the cue within the shortest syntactic path in both constituency and dependency parse *** Bi-LSTM learns the context representation along the sentence in both forward and backward *** evaluate our model on the Bioscope corpus,and get 90.82%F-score(78.31%PCS)on the abstract sub-corpus,outperforming features-dependent approaches.

关键词： natural language processing negation scope detection convolutional neural network recurrent neural network syntactic path

来源：

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

High molecular karyotype variation revealed in indigenous Elymus nutans in the Qinghai Plateau

引用

Plant Diversity 2017年第3期39卷 117-122页

作者： Quanwen Dou Feng Yu Yuan Li yanyan zhao Ruijuan Liu Laboratory of Adaptation and Evolution of Plateau Biota Northwest Plateau Institute of BiologyChinese Academy of Sciences Xining 810001 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The karyotypes of 27 individuals of Elymus nutans from eight wild populations in the Qinghai Plateau were analyzed using sequential FISH and GISH. High FISH pattern polymorphism and karyotype variation were detected within and among populations. The chromosome variations were mainly characterized as repeat deletions and amplifications along with inter-genomic translocations. The chromosomes of the St and Y genomes demonstrated higher polymorphism than those of the H genome. Six different intergenomic translocations were identified in 33.3% of individuals; type Ⅰ and Ⅱ translocations were detected with higher frequency. Further analysis revealed that type Ⅰ and Ⅱ translocations were distributed in different geographic regions. The origin of high karyotype variation of E. nutans in the Qinghai plateau is further discussed.

关键词： Elymus nutans Karyotype variation Inter-genomic translocation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of phase transition during roasting of Mountain Pass rare earth concentrate on leaching efficiency of rare earths

引用

Journal of Rare Earths 2024年第2期42卷 409-414,I0006页

作者： yanyan zhao Xu Sun Deliang Meng Xiangsheng Liu Qiang Zhong Zongyu Feng National Engineering Research Center for Rare Earth Grirem Advanced Materials Co.Ltd.Beijing0088China Rare Earth Functional Materials(Xiong'an)Innovation Center Co. Ltd.Xiongan071700China General Research Institute for Nonferrous Metals Beijing100088China

To find a greener and more economical approach for treating the Mountain Pass rare earth concentrate(MPREC),a novel "Combination Method",including the processes of oxidizing roasting,HCI leaching and sulfuric acid roasting,is proposed in this *** this paper,the effect of phase transition behavior in hydrochloric acid leaching during oxidative roasting at 450-600℃ was *** roasting,the bastnasite in MPREC is decomposed into CeLa_(2)O_(3)F_(3) and(Ce_(0.33),La_(0.33),Ca_(0.33))O_(1.5).As the CeLa_(2)O_(3)F_(3) phase has the fluorine-fixation effect,the generated CeLa_(2)O_(3)F_(3) phase can not be dissolved by HCI after roasting at 500 and 550℃,but it can be decomposed by HCI after roasting at over 600℃,resulting in the improvement of the leaching rate of total F *** maximum leaching efficiency of rare earth elements(REEs) can reach 70.32 wt% at the roasting temperature of 550℃.After roasting at over 600℃,some F^-ions in the solution combined with RE^(3+) to form REF_(3) precipitate and enter the leaching residue,and the others are in the form of [CeF_(3)]^+ in the leaching solution during leaching,therefore,the leaching efficiency of non-ce rium REEs decreases while that of cerium element *** work provides basic research for optimizing the actual production process of MPREC.

关键词： Mountain pass rare earth mine Roasting Phase change Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：