检索结果-南通市图书馆

Study of the Transport Behavior of Multispherical Proppant in Intersecting Fracture Based on Discrete Element Method

在线全文

学校读者我要写书评

暂无评论

Energy Engineering 2025年第1期122卷 185-201页

作者： Chengyong Peng JianshuWu Mao Jiang Biao yin yishan lou CnOOC Research Institute Company Limited Beijing100028China School of Petroleum Engineering Yangtze UniversityWuhan430100China Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering(yangtze University) Wuhan430100China

To analyze the differences in the transport and distribution of different types of proppants and to address issues such as the short effective support of proppant and poor placement in hydraulically intersecting fractures,this study considered the combined impact of geological-engineering factors on *** reservoir production parameters and the discrete elementmethod,multispherical proppants were ***,a 3D fracture model,based on the specified conditions of the L block,employed coupled(Computational Fluid Dynamics)CFD-DEM(Discrete ElementMethod)for joint simulations to quantitatively analyze the transport and placement patterns of multispherical proppants in intersecting *** indicate that turbulent kinetic energy is an intrinsic factor affecting proppant ***,the efficiency of placement and migration distance of low-sphericity quartz sand constructed by the DEM in the main fracture are significantly reduced compared to spherical ceramic proppants,with a 27.7%decrease in the volume fraction of the fracture surface,subsequently affecting the placement concentration and damaging fracture *** to small-angle fractures,controlling artificial and natural fractures to expand at angles of 45°to 60°increases the effective support length by approximately 20.6%.During hydraulic fracturing of gas wells,ensuring the fracture support area and post-closure conductivity can be achieved by controlling the sphericity of proppants and adjusting the perforation direction to control the direction of artificial fractures.

关键词： Hydraulic fracturing discrete element method proppant sphericity CFD-DEM

Smart Cellulose‑Based Janus Fabrics with Switchable Liquid Transportation for Personal Moisture and Thermal Management

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-Micro Letters 2025年第1期17卷 333-347页

作者： Jianfeng Xi yanling lou Liucheng Meng Chao Deng youlu Chu Zhaoyang Xu Huining Xiao Weibing Wu Jiangsu Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsJiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass MaterialsNanjing Forestry UniversityNanjing 210037People’s Republic of China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China Department of Chemical Engineering University of New BrunswickFrederictonNB E3B 5A3Canada Macromolecular Chemistry and Bavarian Polymer Institute University of BayreuthBayreuth 95440Germany

The Janus fabrics designed for personal moisture/thermal regulation have garnered significant attention for their potential to enhance human ***,the development of smart and dynamic fabrics capable of managing personal moisture/thermal comfort in response to changing external environments remains a ***,a smart cellulose-based Janus fabric was designed to dynamically manage personal moisture/*** cotton fabric was grafted with n-isopropylacrylamide to construct a temperature-stimulated transport ***,hydrophobic ethyl cellulose and hydrophilic cellulose nanofiber were sprayed on the bottom and top sides of the fabric to obtain wettability *** fabric exhibits anti-gravity directional liquid transportation from hydrophobic side to hydrophilic side,and can dynamically and continuously control the transportation time in a wide range of 3–66 s as the temperature increases from 10 to 40℃.This smart fabric can quickly dissipate heat at high temperatures,while at low temperatures,it can slow down the heat dissipation rate and prevent the human from becoming too *** addition,the fabric has UV shielding and photodynamic antibacterial properties through depositing graphitic carbon nitride nanosheets on the hydrophilic *** smart fabric offers an innovative approach to maximizing personal comfort in environments with significant temperature variations.

关键词： Directional water transport Cotton fabric Anti-gravity directional liquid transportation Janus wettability

Multiple dynamic bonds enable high mechanical strength and efficient room-temperature self-healable polyurethane for triboelectric nanogenerators

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Wenwen Zhang Huixia Xuan Xiaofei Xu Jiaming lou Qingbao Guan Zhengwei you State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional Materials College of Materials Science and Engineering Shanghai Key Laboratory of Lightweight Composite Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine Donghua University

For room temperature self-healing triboelectric nanogenerators（TEnGs）, the inherent contradiction between mechanical strength and self-healing properties was an urgent problem to be solved. Based on the phenol-carbamate bond, this paper proposed a strategy to design a new molecular structure and coordinate the triple dynamic bonds, which provided a feasible strategy to solve this contradiction. With polytetramethylene ether glycol（M_n= 1,000） as the soft segment in the main chain of polyurethane（PU）, meanwhile methylene diphenyl diisocyanate and 4,4′-dihydroxybiphenyl（BP） as the hard segment and chain extension agent, respectively, the combination of tetrad benzene ring endowed the resultant 4BP-PU with π-π interaction. The effective reversible dissociation and association with hydrogen bond not only bestowed 4BP-PU with high mechanical strength（16.14 MPa）, but also promoted high self-healing efficiency（94.8%） at room temperature. 4BP-PU was selected as the elastic substrate between polydimethylsiloxane and copper sheet to prepare a self-healing TEnG to collect energy from natural ***, the rational molecular structure design provided new ideas for developing self-healing materials and fabricating energy harvest electronics.

关键词：

Preparation of silver nanoparticles through the reduction of straw-extracted lignin and its antibacterial hydrogel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 504-514页

作者： lou Zhang Shuo Li Fu Tang Jingkai Zhang yuetong Kang Hean Zhang Lidong Li State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Silver nanoparticles(Ag nPs)have attracted attention in the field of biomaterials due to their excellent antibacterial ***,the reducing and stabilizing agents used for the chemical reduction of Ag nPs are usually toxic and may cause water *** this work,Ag nPs(31.2 nm in diameter)were prepared using the extract of straw,an agricultural waste,as the reducing and stabilizing *** analysis revealed that the straw extract contained lignin,the structure of which possesses phenolic hydroxyl and methoxy groups that facilitate the reduction of silver salts into Ag *** surfaces of Ag nPs were negatively charged due to the encapsulation of a thin layer of lignin molecules that prevented their *** the prepared Ag nPs were added to the precursor solution of acrylamide,free radical polymerization was triggered without the need for extra heating or light irradiation,resulting in the rapid formation of an Ag nP-polyacrylamide composite *** inhibition zone test proved that the composite hydrogel possessed excellent antibacterial ability due to the presence of Ag *** prepared hydrogel may have potential applications in the fabrication of biomedical materials,such as antibacterial dressings.

关键词： silver nanoparticles hydrogel straw extraction antibacterial

Role of the globus pallidus in motor and non-motor symptoms of Parkinson's disease

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第6期20卷 1628-1643页

作者： yimiao Jiang Zengxin Qi Huixian Zhu Kangli Shen Ruiqi Liu Chenxin Fang Weiwei lou yifan Jiang Wangrui yuan Xin Cao Liang Chen Qianxing Zhuang Department of Physiology School of MedicineNantong UniversityNantongJiangsu ProvinceChina Department of neurosurgery Huashan HospitalShanghai Medical CollegeFudan UniversityShanghaiChina national Center for neurological Disorders ShanghaiChina Shanghai Key Laboratory of Brain Function Restoration and neural Regeneration ShanghaiChina State Key Laboratory of Medical neurobiology and MOE Frontiers Center for Brain Science Institute of Brain ScienceFudan UniversityShanghaiChina

The globus pallidus plays a pivotal role in the basal ganglia circuit. Parkinson's disease is characterized by degeneration of dopamine-producing cells in the substantia nigra, which leads to dopamine deficiency in the brain that subsequently manifests as various motor and non-motor symptoms. This review aims to summarize the involvement of the globus pallidus in both motor and non-motor manifestations of Parkinson's disease. The firing activities of parvalbumin neurons in the medial globus pallidus, including both the firing rate and pattern, exhibit strong correlations with the bradykinesia and rigidity associated with Parkinson's disease. Increased beta oscillations, which are highly correlated with bradykinesia and rigidity, are regulated by the lateral globus pallidus. Furthermore,bradykinesia and rigidity are strongly linked to the loss of dopaminergic projections within the cortical-basal ganglia-thalamocortical loop. Resting tremors are attributed to the transmission of pathological signals from the basal ganglia through the motor cortex to the cerebellum-ventral intermediate nucleus circuit. The cortico–striato–pallidal loop is responsible for mediating pallidi-associated sleep disorders. Medication and deep brain stimulation are the primary therapeutic strategies addressing the globus pallidus in Parkinson's disease. Medication is the primary treatment for motor symptoms in the early stages of Parkinson's disease, while deep brain stimulation has been clinically proven to be effective in alleviating symptoms in patients with advanced Parkinson's disease,particularly for the movement disorders caused by levodopa. Deep brain stimulation targeting the globus pallidus internus can improve motor function in patients with tremordominant and non-tremor-dominant Parkinson's disease, while deep brain stimulation targeting the globus pallidus externus can alter the temporal pattern of neural activity throughout the basal ganglia–thalamus network. Therefore, the comp

关键词： anxiety basal ganglia bradykinesia deep brain stimulation depression globus pallidus externus globus pallidus internus lateral globus pallidus medial globus pallidus neural circuit Parkinson's disease

Cortical hem signaling center: functions, development, and potential implications for evolution and brain disorders

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第4期20卷 1079-1080页

作者： Victor V.Chizhikov Igor y.Iskusnykh Department of Anatomy and neurobiology University of Tennessee Health Science CenterMemphisTNUSA

Development of the telencephalon relies upon several signaling centers-localized cellular populations that supply secreted factors to pattern the cortical *** such signaling center is the cortical hem,which arises during embryonic development at the telencephalic dorsal midline,adjacent to the choroid plexus and hippocampal primordium(Figure 1A).While the cortical hem has also been described in reptiles and birds,most of our knowledge about the developmental roles of the cortical hem is derived from the analysis in *** cortical hem produces several types of secreted molecules,including wingless-related integration site(Wnt)and bone morphogenetic(Bmp)*** cortical hem is particularly important for the development of the hippocampus,which is involved in learning and memory,and the neocortex,which is the most complex brain region that mediates multiple types of behavior and higher cognitive functions(Mangale et al.,2008;Dal-Valle-Anton and Borrell,2022).

关键词： epithelium Figure center

nucleoside modified mRnA-lipid nanoparticles as a new delivery platform for the repair of the injured spinal cord

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第8期20卷 2311-2312页

作者： Krisztián Pajer Tamás Bellák Antal nógrádi Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary

Spinal cord injury and treatment opportunities:The adult mammalian spinal cord has a very limited capacity for spontaneous regeneration due to various intrinsic molecular and cellular *** the spinal cord neurons have the capacity to regenerate their axons,the expression of growth inhibitory factors,lack or suppression of proper guidance cues,and profound inflammatory responses do not permit successful regeneration(Khyeam et al.,2021).

关键词： injured capacity modified

Ren-integrable and ren-symmetric integrable systems

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第3期76卷 62-69页

作者： S y lou School of Physical Science and Technology Ningbo UniversityNingbo315211China

A new type of symmetry,ren-symmetry,describing anyon physics and corresponding topological physics,is ***-symmetry is a generalization of super-symmetry which is widely applied in super-symmetric physics such as super-symmetric quantum mechanics,super-symmetric gravity,super-symmetric string theory,super-symmetric integrable systems and so *** and Grassmann numbers are,in some sense,dual conceptions,and it turns out that these conceptions coincide for the ren situation,that is,a similar conception of ren-number(R-number)is devised for *** particular,some basic results of the R-number and ren-symmetry are exposed which allow one to derive,in principle,some new types of integrable systems including ren-integrable models and ren-symmetric integrable *** examples of ren-integrable KdV-type systems and ren-symmetric KdV equations are explicitly given.

关键词： symmetries integrable systems anyon physics extended supersymmetry ren-symmetry

在线全文

学校读者我要写书评

暂无评论

小学英语阅读教学中跨学科素材的关联策略

教学与管理 2025年第2期 56-59页

作者：娄甜江苏省淮安市天津路小学

当前，推动课程综合化实施，加强学科交融，促进学科关联性学习已然成为课程改革的重要内容，这就要求教师在英语教学中树立跨学科意识，培育学生的跨学科素养。在英语阅读教学中积极融合跨学科素材，能够有效促进儿童阅读的深度与广度... 详细信息

当前，推动课程综合化实施，加强学科交融，促进学科关联性学习已然成为课程改革的重要内容，这就要求教师在英语教学中树立跨学科意识，培育学生的跨学科素养。在英语阅读教学中积极融合跨学科素材，能够有效促进儿童阅读的深度与广度，提高儿童阅读的主动性与积极性，彰显跨学科学习的的功能与价值。结合具体的小学英语阅读教学案例，提出建立关联、指向关联、审视关联的跨学科素材融合策略，以期发挥跨学科素材的学科价值与育人价值。

关键词：跨学科素材阅读教学关联性学习小学英语