|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Research and Development of Indoor Positioning显示文摘Indoor positioning systems have been sufficiently researched to provide location information of persons and devices.This paper is focused on the current research and further development of indoor positioning.The standard evolution and industry development are summarized.There are various positioning systems according to the scenarios,cost and accuracy.However,there is a basic positioning system framework including information extraction,measurement and calculation.In particular,the detailed positioning technologies mainly including cellular positioning and Local Area Network(LAN) positioning are listed and compared to provide a reference for practical applications.Finally,we summarize the challenges of indoor positioning and give a3-phase evolution route. | Qi Liu Jiahui Qiu Yi Chen | 2016 | China Communications2016，13，S2： | 5 |
| 2 | Tranexamic acid for acute intracerebral haemorrhage growth based on imaging assessment (TRAIGE): a multicentre, randomised, placebo- controlled trial显示文摘Background Studies show tranexamic acid can reduce the risk of death and early neurological deterioration after intracranial haemorrhage.We aimed to assess whether tranexamic acid reduces haematoma expansion and improves outcome in intracerebral haemorrhage patients susceptible to haemorrhage expansion.Methods We did a prospective,double-blind,randomised,placebo-controlled trial at 10 stroke centres in China.Acute supratentorial intracerebral haemorrhage patients were eligible if they had indication of haemorrhage expansion on admission imaging(eg,spot sign,black hole sign or blend sign),and were treatable within 8 hours of symptom onset.Patients were randomly assigned(1:1)to receive either tranexamic acid or a matching placebo.The primary outcome was intracerebral haematoma growth(>33% relative or>6 mL absolute)at 24 hours.Clinical outcomes were assessed at 90 days.Results Of the 171 included patients,124(72.5%)were male,and the mean age was 55.9±11.6 years.89 patients received tranexamic acid and 82 received placebo.The primary outcome did not differ significantly between the groups:36(40.4%)patients in the tranexamic acid group and 34(41.5%)patients in the placebo group had intracranial haemorrhage growth(OR 0.96,95% CI 0.52 to 1.77,p=0.89).The proportion of death was lower in the tranexamic acid treatment group than placebo group(8.1%vs 10.0%),but there were no significant differences in secondary outcomes including absolute intracranial haemorrhage growth,death and dependency.Conclusions Among patients susceptible to haemorrhage expansion treated within 8 hours of stroke onset,tranexamic acid did not significantly prevent intracerebral haemorrhage growth.Larger studies are needed to assess safety and efficacy of tranexamic acid in intracerebral haemorrhage patients. | Jingyi Liu Ximing Nie Hongqiu Gu Qi Zhou Haixin Sun Ying Tan Dacheng Liu Lina Zheng Jiahui Zhao Yan Wang Yibin Cao Haomeng Zhu Yunpeng Zhang Lijin Yi Yuehua Pu Miao Wen Zhonghua Yang Shengjun Sun Wenzhi Wang Xingquan Zhao Liping Liu Yongjun Wang | 2021 | Stroke & Vascular Neurology2021，6，2： | 3 |
| 3 | Human activities and elevational constraints restrict ranging patterns of snub-nosed monkeys in a mountainous refuge显示文摘Both natural conditions and anthropogenic factors affect the survivability,distribution,and population density of wildlife.To understand the extent and how these factors drive species distributions,a detailed description of animal movement patterns in natural habitats is needed.In this study,we used satellite telemetry to monitor elevational ranges favored by endangered golden snub-nosed monkeys(Rhinopithecus roxellana),in the Qinling Mountains,central China.We investigated the abundance and distribution of food resources through sampling vegetation quadrats at different elevations and sampled anthropogenic activities using field surveys.Our results indicated that although there was no significant variation in food resources between low-(<1500 m)and middle-elevations(1500–2200 m),monkeys were found most often in areas above 1500 m,where there was less anthropogenic development(e.g.houses and roads);however,monkeys rarely ranged above 2200 m and had limited food availability at this altitude.There was limited human disturbance at this elevation.We suggest that both human activity and ecological constraints(i.e.food resources)have considerable effects on elevational use of R.roxellana in the Qinling Mountains.This study highlights the critical roles these factors can play in shaping the vertical distribution of high-altitude primates.This research provides useful insights for habitat-based conservation plans in which human disturbance management and habitat restoration should be prioritized. | Pengzhen HUANG Kun BIAN Zhipang HUANG Qi Li Derek WDUNN Gu FANG Jiahui LIU Mengyao WANG Xianfeng YANG Ruliang PAN Cunlao GAO Kaichuang SI Baoguo LI Xiaoguang QI | 2021 | Integrative Zoology2021，16，2： | 3 |
| 4 | PbMC1a/1b regulates lignification during stone cell development in pear(Pyrus bretschneideri)fruit显示文摘Programmed cell death(PCD)and secondary cell wall(SCW)thickening in pear fruit are accompanied by the deposition of cellulose and lignin to form stone cells.Metacaspase is an important protease for development,tissue renewal and PCD.The understanding of the molecular mechanism whereby pear(Pyrus)metacaspase promotes PCD and cell wall lignification is still limited.In this study,the Metacaspases gene family(PbMCs)from P.bretschneideri was identified.PbMC1a/1b was associated with lignin deposition and stone cell formation by physiological data,semiquantitative real-time polymerase chain reaction(RT-PCR)and quantitative RT-PCR(qRT-PCR).Relative to wildtype(WT)Arabidopsis,the overexpression of PbMC1a/1b increased lignin deposition and delayed growth,thickened the cell walls of vessels,xylary fibers and interfascicular fibers,and increased the expression of lignin biosynthetic genes.Yeast two-hybrid(Y2H),bimolecular fluorescence complementation(BiFC)and GST pull-down assays indicated that the PbMC1a/1b protein physically interacted with PbRD21.Simultaneously,the transient expression of PbMC1a/1b and PbRD21 led to significant changes in the expression of genes and lignin contents in pear fruits and flesh calli.These results indicate that PbMC1a/1b plays an important role in cell wall lignification,possibly by interacting with PbRD21 to increase the mRNA levels of some lignin synthesis-associated genes and promote the formation of stone cells in pear fruit. | Xin Gong Zhihua Xie Kaijie Qi Liangyi Zhao Yazhou Yuan Jiahui Xu Weikang Rui Katsuhiro Shiratake Jianping Bao Shahrokh Khanizadeh Shaoling Zhang Shutian Tao | 2020 | Horticulture Research2020，7，1： | 3 |
| 5 | Achieving higher performances without an external curing agent in natural magnolol-based epoxy resin显示文摘Bio-based epoxy thermoset prepared from renewable biomass raw materials can alleviate fossil energy crisis and reduce environmental pollution,which satisfies the needs of sustainable social development.In this study,a bio-based epoxy thermoset precursor(MGOL-EP) was synthesized from a naturally occurring magnolol through a facile and efficient one-step process.And the fully bio-based epoxy thermoset(MGOL-EP-SC) was obtained by self-curing without adding any other hardener.MGOL-EP-SC revealed an extremely high glass-transition temperature(T_(g)) of 265℃ and char yield of 53.2%(in N;),which were at the highest level among the fully bio-based epoxy thermosets reported so far.In addition,when the MGOL-EP was cured with 4,4’-methylenedianiline(DDM),T_(g)of the MGOL-EP/DDM was decreased by 61℃ and the other comprehensive performance had also been decreased,which was due to a reduction in biphenyl structure content and cross-linking density by adding the external curing agents.Moreover,the MGOL-EP-SC presented certain killing rate(48.4%) to Staphylococcus aureus.These findings provide a new design strategy for engineering high-performance and functional epoxy thermoset with high biomass content. | Qi Cao Zhihuan Weng Yu Qi Jiahui Li Wentao Liu Chengde Liu Shouhai Zhang Zhiyong Wei Yousi Chen Xigao Jian | 2022 | Chinese Chemical Letters2022，33，4： | 2 |
| 6 | 颜色和物候表明46种温带落叶木本植物衰老叶片的养分变异显示文摘不同共生植物的叶片养分含量差异显著,反映了不同的叶片养分利用策略。然而,衰老叶片养分的种间变异及其驱动因素尚不清楚。本研究旨在探讨衰老叶片养分的种间变异及其驱动因素。我们在中国东北的帽儿山森林生态系统研究站测定了46种共存温带落叶木本植物新鲜落叶的碳、氮、磷浓度。采用随机森林模型量化10个生物因素(菌根类型、固氮类型、生长形态、耐阴性、叶片质地、变色程度、变色类型、叶片变色峰期、落叶峰期和落叶末期)的相对重要性。研究结果表明,落叶氮浓度种间变化为4倍,磷浓度变化达9倍。较高的氮和磷平均浓度(15.38和1.24 mg·g^(−1))表明该森林氮和磷限制较弱。功能群仅对特定养分及其比值有显著影响。磷浓度、氮磷比与外生菌根树种的落叶高峰日和落叶结束日呈负相关。颜色鲜艳的叶片(红色>棕色>黄色>黄绿色>绿色)倾向于比绿色叶片氮和磷浓度更低而碳氮比和碳磷比较高。随机森林模型表明,秋季叶变色和落叶物候贡献了80%的种间变异解释量。这些结果增加了我们对温带森林木本植物营养策略之衰老叶片养分变异性的理解。 | Xingchang Wang Qi Wang Yue Chen Rui Zhao Jiahui Zhang Xiankui Quan Fan Liu Chuankuan Wang | 2022 | Journal of Plant Ecology2022，15，4： | 1 |
| 7 | Application of cross-hole radar tomography in karst area显示文摘 | TAN Hanhua HUANG Jiahui QI Shengwen | 2011 | Environmental Earth Sciences2011，66，1： | 1 |
| 8 | Effect of barrier thickness of Polytetrafluoroethylene on the Direct Current breakdown characteristics of liquid nitrogen显示文摘When high-temperature superconducting(HTS)tapes in high voltage DC HTS devices are quenched,amounts of thermal bubbles are generated in liquid nitrogen(LN_(2))that will reduce the insulation strength greatly.Especially when resistive-type superconducting fault current limiters meet a short-circuit fault,the insulation strength of the LN_(2)decreased significantly due to the thermal bubbles and electrothermal pressure.Solid insulating barriers can improve the insulation strength of the LN_(2).The objective of this study is to obtain the effect of barrier thickness on the DC dielectric breakdown characteristics of LN_(2).Insulating barrier Polytetrafluoroethylene with three different thicknesses were tested.Three types of electrodes such as rod-plane,needle-plane,and planeplane were applied.The results showed that the barriers can increase the negative and positive breakdown voltage both with and without thermal bubbles in a slightly nonuniform field(SNF)and non-uniform field(NF).For the SNF,the DC breakdown voltage is higher when the barrier is thinner.The effect of the barrier thickness in the NF is lower than that in the SNF field.For the NF,the positive breakdown voltage is higher when the barrier is thicker. | Bin Xiang Lei Gao Jiahui Zhang Qi Zhang Zhiyuan Liu Yingsan Geng Jianhua Wang Youping Tu | 2022 | High Voltage2022，7，5： | 1 |
| 9 | Extracellular RNAs-TLR3 signaling contributes to cognitive impairment after chronic neuropathic pain in mice显示文摘Chronic pain is often associated with cognitive decline,which could influence the quality of the patient’s life.Recent studies have suggested that Toll-like receptor 3(TLR3)is crucial for memory and learning.Nonetheless,the contribution of TLR3 to the pathogenesis of cognitive decline after chronic pain remains unclear.The level of TLR3 in hippocampal neurons increased in the chronic constriction injury(CCI)group than in the sham group in this study.Importantly,compared to the wild-type(WT)mice,TLR3 knockout(KO)mice and TLR3-specific neuronal knockdown mice both displayed improved cognitive function,reduced levels of inflammatory cytokines and neuronal apoptosis and attenuated injury to hippocampal neuroplasticity.Notably,extracellular RNAs(exRNAs),specifically double-stranded RNAs(dsRNAs),were increased in the sciatic nerve,serum,and hippocampus after CCI.The co-localization of dsRNA with TLR3 was also increased in hippocampal neurons.And the administration of poly(I:C),a dsRNA analog,elevated the levels of dsRNAs and TLR3 in the hippocampus,exacerbating hippocampus-dependent memory.In additon,the dsRNA/TLR3 inhibitor improved cognitive function after CCI.Together,our findings suggested that exRNAs,particularly dsRNAs,that were present in the condition of chronic neuropathic pain,activated TLR3,initiated downstream inflammatory and apoptotic signaling,caused damage to synaptic plasticity,and contributed to the etiology of cognitive impairment after chronic neuropathic pain. | Xueying Zhang Rui Gao Changteng Zhang Yi Teng Hai Chen Qi Li Changliang Liu Jiahui Wu Liuxing Wei Liyun Deng Lining Wu Shixin Ye-Lehmann Xiaobo Mao Jin Liu Tao Zhu Chan Chen | 2023 | Signal Transduction and Targeted Therapy2023，8，9： | 0 |
| 10 | Neural stem cell-derived exosomes promote mitochondrial biogenesis and restore abnormal protein distribution in a mouse model of Alzheimer's disease显示文摘Mitochondrial dysfunction is a hallmark of Alzheimer’s disease.We previously showed that neural stem cell-derived extracellular vesicles improved mitochondrial function in the cortex of AP P/PS1 mice.Because Alzheimer’s disease affects the entire brain,further research is needed to elucidate alterations in mitochondrial metabolism in the brain as a whole.Here,we investigated the expression of several important mitochondrial biogenesis-related cytokines in multiple brain regions after treatment with neural stem cell-derived exosomes and used a combination of whole brain clearing,immunostaining,and lightsheet imaging to clarify their spatial distribution.Additionally,to clarify whether the sirtuin 1(SIRT1)-related pathway plays a regulatory role in neural stem cell-de rived exosomes interfering with mitochondrial functional changes,we generated a novel nervous system-SIRT1 conditional knoc kout AP P/PS1mouse model.Our findings demonstrate that neural stem cell-de rived exosomes significantly increase SIRT1 levels,enhance the production of mitochondrial biogenesis-related fa ctors,and inhibit astrocyte activation,but do not suppress amyloid-βproduction.Thus,neural stem cell-derived exosomes may be a useful therapeutic strategy for Alzheimer’s disease that activates the SIRT1-PGC1αsignaling pathway and increases NRF1 and COXIV synthesis to improve mitochondrial biogenesis.In addition,we showed that the spatial distribution of mitochondrial biogenesis-related factors is disrupted in Alzheimer’s disease,and that neural stem cell-derived exosome treatment can reverse this effect,indicating that neural stem cell-derived exosomes promote mitochondrial biogenesis. | Bo Li Yujie Chen Yan Zhou Xuanran Feng Guojun Gu Shuang Han Nianhao Cheng Yawen Sun Yiming Zhang Jiahui Cheng Qi Zhang Wei Zhang Jianhui Liu | 2024 | Neural Regeneration Research2024，19，7： | 0 |
| 11 | Mechanisms and applications of antitumor immunotherapy of responsive drug-loaded nanoparticles in breast cancer显示文摘During the chemotherapy of tumors,the cytotoxic effect of drugs is vital to kill tumor cells,and the delivery of a chemotherapeutic agent is of great importance for optimal therapeutic effects.The high in vivo clearance rate and low delivery efficiency of conventional chemotherapeutic agents affect the therapeutic effect.In recent years,the responsive drug delivery nanosystem has received increasing concern owing to its excellent biocompatibility,stable delivery performance,and controlled drug release strategies.To lucidly explain the cytocidal and immunotherapeutic effects of such responsive nanosystems in breast cancer,this review discusses the various stimuli and responses of drug-loaded liposomal nanosystems.The light/magnetic response of drug-loaded bionic membranes nanosystems and the heat/magnetic response of drug-loaded iron oxide nanosystems are also elaborated.Their cancer cell-killing efficacy and antitumor immunotherapeutic effects are also scrutinized. | LETIAN JIN HETING CHEN QI RUAN RUI LIU YIFENG FAN XIUFANG XU DAJIANG WANG JIAHUI LU | 2023 | BIOCELL2023，47，7： | 0 |
| 12 | Facile recycling of anhydride-cured epoxy thermoset under mild conditions with multifunctional hydrazine hydrate显示文摘Environmental economics is accelerating the urgency to develop recycling technologies for the ever-growing quantity of discarded thermoset polymers.Herein,we developed a mild and energy-saving pro-cess for high-eficiency degradation and reuse of anhydride-cured epoxy thermoset with the aid of hy-drazine hydrate.The degradation degree of the epoxy resin reached 99.6%at 120℃ within a short time of 60min.During the reaction,the ester bonds in the cross-linked network were selectively cleaved by the amination of hydrazine hydrate,and the epoxy resin was fully converted to new monomers that con-tained hydrazide and hydroxyl groups,respectively.Moreover,the degradation mechanism of the epoxy resin in hydrazine hydrate was studied and a nucleation model was utilized to predict the actual degra-dation behavior of the system.Finally,the degradation products can be directly mixed with epoxy precur-sor to prepare a new waterborne epoxy coating with good comprehensive properties.This work not only demonstrates a new way to realize the efficient degradation of epoxy resins,but also provides a facile and efficient recycling protocol for thermosets. | Beitao Liu Qi Cao Jiahui Li Xigao Jian Zhihuan Weng | 2023 | Chinese Chemical Letters2023，34，12： | 0 |
| 13 | Joint inversion of magnetotelluric and fullwaveform seismic data based on alternating cross-gradient structural constraints显示文摘Magnetotelluric(MT)inversion and seismic inversion are important methods for the interpretation of subsurface exploration data,but separate inversion of MT and seismic produces ambiguous and non-unique results due to various factors.In order to achieve accurate results,the authors propose a joint inversion method of two-dimensional MT and seismic data in the frequency domain.The finite element method is used for numerical simulation of electromagnetic data in the forward modelling,and the Gauss-Newton method is used for the inversion.The 9-point-finite-difference method is used to solve the seismic wave field in the acoustic wave equation,and the inverse problem of seismic data is solved by full waveform inversion with a conjugate gradient,a simple and fast method.Cross gradient functions are used to provide constraint structure between resistivity and velocity parameters to carry out the joint inversion.The joint inversion algorithm is tested by double-rectangular model synthesis data,and the accuracy of the algorithm is verified.The results show that the joint inversion results are better than those from separate inversion.The algorithm is applied to a geophysical model of a metalliferous deposit in Jinchuan and is compared with the separate inversion results.It shows that the results obtained with joint inversion are much closer to the real model. | QI Jiahui FENG Xuan Enhedelihai Nilot LI Xiaodan | 2020 | Global Geology2020，23，2： | 0 |
| 14 | Atomic-resolution characterization on the structure of strontium doped barium titanate nanoparticles显示文摘Ferroelectric barium titanate nanoparticles(BTO NPs)may play critical roles in miniaturized passive electronic devices such as multi-layered ceramic capacitors.While increasing experimental and theoretical understandings on the structure of BTO and doped BTO have been developed over the past decade,the majority of the investigation was carried out in thin-film materials;therefore,the doping effect on nanoparticles remains unclear.Especially,doping-induced local composition and structure fluctuation across single nanoparticles have yet to be unveiled.In this work,we use electron microscopy-based techniques including high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM),integrated differential phase contrast(iDPC)-STEM,and energy dispersive X-ray spectroscopy(EDX)mapping to reveal atomically resolved chemical and crystal structure of BTO and strontium doped BTO nanoparticles.Powder X-ray diffraction(PXRD)results indicate that the increasing strontium doping causes a structural transition from tetragonal to cubic phase,but the microscopic data validate substantial compositional and microstructural inhomogeneities in strontium doped BTO nanoparticles.Our work provides new insights into the structure of doped BTO NPs and will facilitate the materials design for next-generation high-density nano-dielectric devices. | Haoyu Jiang Jizhen Qi Dongchang Wu Wei Lu Jiahui Qian Haifeng Qu Yixiao Zhang Pei Liu Xi Liu Liwei Chen | 2021 | Nano Research2021，14，12： | 0 |
| 15 | The distinct morphological phenotypes of Southeast Asian aborigines are shaped by novel mechanisms for adaptation to tropical rainforests显示文摘Southeast Asian aborigines, the hunter-gatherer populations living in tropical rainforests, exhibit distinct morphological phenotypes, including short stature, dark skin, curly hair and a wide and snub nose. The underlying genetic architecture and evolutionary mechanism of these phenotypes remain a long-term mystery. We conducted whole genome deep sequencing of 81 Cambodian aborigines from eight ethnic groups. Through a genome-wide scan of selective sweeps, we discovered key genes harboring Cambodian-enriched mutations that may contribute to their phenotypes, including two hair morphogenesis genes(TCHH and TCHHL1), one nasal morphology gene(PAX3) and a set of genes(such as ENTPD1-AS1) associated with short stature. The identified new genes and novel mutations suggest an independent origin of the distinct phenotypes in Cambodian aborigines through parallel evolution, refuting the long-standing argument on the common ancestry of these phenotypes among the worldwide rainforest hunter-gatherers. Notably, our discovery reveals that various types of molecular mechanisms, including antisense transcription and epigenetic regulation, contribute to human morphogenesis, providing novel insights into the genetics of human environmental adaptation. | Xiaoming Zhang Qi Liu Hui Zhang Shilei Zhao Jiahui Huang Tuot Sovannary Long Bunnath Hong Seang Aun Ham Samnom Bing Su Hua Chen | 2022 | National Science Review2022，9，3： | 0 |
| 16 | Preparation of CeO_(2) abrasives by reducing atmosphere-assisted molten salt method for enhancing their chemical mechanical polishing performance on SiO_(2)substrates显示文摘Ce^(3+)as the active site on the CeO_(2)abrasive surface is the key to enhancing the material removal rate(MRR).The CeO_(2)abrasives with high chemical activity were prepared by the molten salt method under a reducing atmosphere.The crystal structure and morphology of CeO_(2)abrasive s were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FT-IR),ultraviolet—visible diffuse reflectance spectroscopy(UV-Vis DRS),and X-ray photoelectron spectroscopy(XPS).The CeO_(2)abrasives were obtained under different atmospheres(Air,Ar,and Ar/H_(2)).With the enhancement of the reducing atmosphere,the morphology of the abrasives transforms from spherical to octahedral,while more oxygen vacancies and Ce^(3+)are generated on the surface of CeO_(2)abrasives.The CMP experiments show that the MRRs of the CeO_(2)-Air,CeO_(2)-Ar,and CeO_(2)-Ar/H_(2)abrasives on SiO_(2)substrates are 337.60,578.74,and 691.28 nm/min,respectively.Moreover,as confirmed by atomic force microscopy(AFM),the substrate surfaces exhibit low roughness(20.5 nm)after being polished using all of the prepared samples.Especially,the MRR of CeO_(2)-Ar/H_(2)abrasives is increased by 104.76%compared with CeO_(2)-air abrasives.The improved CMP performance is attributed to the increased Ce^(3+)concentration and the octahedral morphology of the abrasives enhancing the chemical reaction and mechanical removal at the abrasive-substrate interface. | Ning Xu Jiahui Ma Qi Liu Yuxin Luo Yongping Pu | 2023 | Journal of Rare Earths2023，41，10： | 0 |
| 17 | A Novel System for Recognizing Recording Devices from Recorded Speech Signals显示文摘The field of digital audio forensics aims to detect threats and fraud in audio signals.Contemporary audio forensic techniques use digital signal processing to detect the authenticity of recorded speech,recognize speakers,and recognize recording devices.User-generated audio recordings from mobile phones are very helpful in a number of forensic applications.This article proposed a novel method for recognizing recording devices based on recorded audio signals.First,a database of the features of various recording devices was constructed using 32 recording devices(20 mobile phones of different brands and 12 kinds of recording pens)in various environments.Second,the audio features of each recording device,such as the Mel-frequency cepstral coefficients(MFCC),were extracted from the audio signals and used as model inputs.Finally,support vector machines(SVM)with fractional Gaussian kernel were used to recognize the recording devices from their audio features.Experiments demonstrated that the proposed method had a 93.4%accuracy in recognizing recording devices. | Yongqiang Bao Qi Shao Xuxu Zhang Jiahui Jiang Yue Xie Tingting Liu Weiye Xu | 2020 | Computers, Materials & Continua2020，，12： | 0 |
| 18 | Dynamic traveling time forecasting based on spatial-temporal graph convolutional networks显示文摘1 Introduction Traveling time forecasting,the core component in GPS navigation systems and taxi-hailing apps,has attracted widespread attention.Existing research mostly focuses on independent points like traffic flow prediction[1,2]or route planning[3,4],which ignore globality and lack satisfactory dynamic progress to adopt sophisticated traffic conditions.To facilitate this line of research,we propose a novel Dynamic Traveling Time forecasting framework based on the Spatial and Temporal Graph convolution(DTT-STG)integrated with map-matching,road speed forecasting,and route planning with full consideration of the dynamic spatial and temporal dependency.DTT-STG designs an angle-based map-matching algorithm to describe the direction of vehicles and explores a self-adaptive adjacency matrix combined with diffusion convolution and attention mechanisms to capture the dynamically changing spatial-temporal dependencies.Afterward,the progressive method is exploited to calculate the traveling time and plan the shortest route dynamically in continuously changing traffic states. | Fangshu CHEN Yufei ZHANG Lu CHEN Xiankai MENG Yanqiang QI Jiahui WANG | 2023 | Frontiers of Computer Science2023，17，6： | 0 |
| 19 | Measurement Analysis of an Indoor Positioning System Based on LTE显示文摘Location information is playing an increasing important role in people's life. Specially, indoor positioning systems have been sufficiently researched to provide location information for persons and devices. This paper focuses on the research and development of the indoor positioning system based on LTE uplink signal, which consists of transmitter,Location Measurement Unit (LMU) and server. The Sounding Reference Signal (SRS) is employed as the excitation signal for the estimation of TDOA because of its good autocorrelation. The LMU is used for signal processing and Time-Difference of Arrival (TDOA) calculation,which is connected with four segregate received antennas. Synchronization is not necessary between any two LMUs. Therefore, they can be flexibly deployed on Base Stations (BSs). Additionally, a spatial filtering algorithm without the prior information is proposed to optimize the route tracking. The test results demonstrate that the fixed point positioning error is less than 3m, and the estimated trajectory is basically accordant with the real path in the dynamic test. | Jiahui Qiu Qi Liu Wenhao Zhang Yi Chen | 2017 | 国际计算机前沿大会会议论文集2017，，2： | 0 |
| 20 | Study on polyurethane-based porous materials and their adsorption properties显示文摘The flexible superhydrophobic thermoplastic polyurethane(TPU)porous material was prepared by heat-induced phase separation method with two cooling steps.The influence of the preparation process on the microstructure of the material was discussed in depth.The microstructure,hydrophobicity and specific surface area of porous TPU materials were analyzed in detail.The surface wettability,separation selectivity,saturated adsorption capacity and adsorption rate,mechanical properties,environmental adaptability and cyclic properties of porous TPU materials were studied.The results show that the TPU-8%porous monolithic material prepared by heat-induced phase separation method shows good performance when the polymer concentration is 8%,the phase separation temperature is 0℃,the phase separation time is 30min,and the mixing solvent ratio is 9:1. | Jiajia LI Jiahui ZHU Jialin GU Zhenhao ZHOU Qi SUN Guangcan GUO Yibin ZHOU Shujun CHEN Xinggang SHAN Gangqiang WANG | 2022 | Research and Application of Materials Science2022，4，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员