检索结果-南通市图书馆

Exploring Challenges in Developing a Smart and Effective Assistive System for Improving the Experience of the Elderly Drivers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2017年第5期30卷 1133-1149页

作者： Sebin Jung Hong-ying Meng Sheng-feng Qin Department of Electronic and Computer Engineering Brunel University London Electrical QRD PM UX SBT Division General Motors Korea Northumbria School of Design Northumbria University

As the overall population ages, driving-related accidents and injuries, associated with elderly drivers, have risen. Existing research about elderly drivers mainly focuses on factual data collection and analysis, indicating the elderly＇s growing fatal accident rates and their different behaviours compared to younger drivers. However, few research has focused on design-led practical solutions to mitigate the elderly＇s growing fatal accidents, by consid- ering their usability and body conditions, afflicting the elderly, such as decreased vision, hearing, and reaction times. In this paper, first, current worldwide situations on growing fatal accident rates for elderly drivers is reviewed and the key impact factors are identified and discussed with regarding to usability and design trend in the automotive technology for elderly. Second, existing smart vehicle technology-based solutions to promote safe driving are explored and their pros and cons are discussed and anal- ysed. Most of solutions are not created by people with driving difficulties, which are caused by health problems most commonly afflicting the elderly. Thirdly, diverse design-led research activities are taken, such as a survey, observation, and interviews to gain new understanding of what kinds of driving problems elderly drivers have and demonstrate how new system concepts could be developed for the elderly＇s benefits. Finally, it is found that the elderly＇s low vision and late reaction are main factors causing their driving difficulties. Based on this finding, usable vehicle system design ideas have been proposed, by utilising facial expression sensing technology as a solution. The proposed solutions would ensure reducing both the elderly＇s driving problems and high fatal accident rates and provide a more enjoyable driving environment for the elderly population.

关键词： Elderly drivers Aging health conditionsDriving behaviours Vision impairment Cognitiveimpairment. Hearing loss Reflexes Fatal collision

Electroacupuncture inhibits hippocampal oxidative stress and autophagy in sleep-deprived rats through the protein kinase B and mechanistic target of rapamycin signaling pathway

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2024年第5期44卷 974-980页

作者： zhENG Peng MENG ying LIU Meijun YU Di LIU Huiying WANG Fuchun XU xiaohong Department of Neurology The Third Affiliated Clinical Hospital of Changchun University of Chinese MedicineChangchun 130000China Rehabilitation Medicine Academy Changchun University of Chinese MedicineChangchun 130117China

OBJECTIVE:To investigate the effects of acupuncture on learning and memory impairment,oxidative stress and autophagy induced by sleep depriv ation in rats,and to analyze the related ***:Thirty Wistar rats were randomly divided into a normal group,sleep deprivation group and acupuncture *** rat model of sleep deprivation was established by a modified multiplatform sleep deprivation *** Baihui(GV20),Shenmen(HT7)and Sanyinjiao(SP6)acupoints of rats were located to give electroacupuncture(density wave,frequency 20 Hz,intensity 1 mA)to maintain the needle feeling,and to keep the needle for 15min and continuous acupuncture for 7 *** spatial learning and memory abilities of the rats were detected by the water maze *** content of malondialdehyde(MDA)and the activities of superoxide dismutase(SOD)and glutathione peroxidase(GPX)in the brain were detected by an assay kit,and the autophagy related proteins light chain 3 alpha(LC3A),light chain 3 beta(LC3B)and Beclin 1 and the activation of the protein kinase B(PKB/AKT)and mechanistic target of rapamycin(mTOR)signaling pathway in the rat's brain were detected by Western ***:Compared with the normal group,the time spent in the target quadrant(P<0.05)and the number of times entering the target quadrant(P<0.05)in the rats of sleep deprivation group were significantly reduced,and the content of MDA was significantly increased(P<0.01),while the activities of SOD and GPX(P<0.01)in the brain were significantly decreased,and LC3AⅡ/Ⅰ,LC3BⅡ/Ⅰand Beclin 1 increased significantly(P<0.01),while pAKT(ser473)/AKT,p-mTOR(ser2448)/mTOR and pp70s6K(thr389)/p70S6 decreased significantly(P<0.01).Compared with the sleep deprivation group,the time spent in the target quadrant and the times of entering the target quadrant(P<0.05)in the rats of acupuncture group after 7 d of treatment were significantly increased,Additionally,the content of MDA was significantly decreased(P<0.05),while the activities of SO

关键词： acupuncture sleep deprivation memory and learning tests oxidative stress autophagySupporting information

Changes of heating and cooling degree days over China in response toglobal warming of 1.5℃, 2℃, 3℃ and 4℃

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2018年第3期9卷 192-200页

作者： SHI ying zhANG Dong-feng XU ying zhOU Bo-Tao National Climate Center China Meteorological Administration Beijing 100081 China Shanxi Climate Center Shanxi Meteorological Service Taiyuan 030006 China

Future changes of heating degree days （HDD） and cooling degree days （CDD） in the 21st century with and without considering populationfactor are investigated based on four sets of climate change simulations over East Asia using the regional climate model version 4.4 （RegCM4.4）driven by the global models of CSIRO-Mk3-6-0, EC-EARTH, HadGEM2-ES, and MPI-ESM-MR. Under global warming of 1.5℃, 2℃, 3℃,and 4℃, significant decrease of HDD can be found over China without considering population factor, with greater decrease over high elevationand high latitude regions, including the Tibetan Plateau, the northern part of Northeast China, and Northwest China; while population-weightedHDD increased in areas where population will increase in the future, such as Beijing, Tianjin, parts of southern Hebei, northern Shandong andHenan provinces. Similarly, the CDD projections with and without considering population factor are largely different. Specifically, withoutconsidering population, increase of CDD were observed over most parts of China except the Tibetan Plateau where the CDD remained zerobecause of the cold climate even under global warming; while considering population factor, the future CDD decreases in South China andincreases in North China, the Sichuan Basin, and the southeastern coastal areas, which is directly related to the population changes. The differentfuture changes of HDD and CDD when considering and disregarding the effects of population show that population distribution plays animportant role in energy consumption, which should be considered in future research.

关键词： Regional climate model Global warming of 1.5 ℃ 2℃ 3℃ and 4℃ Heating degree days Cooling degree days China

Phase-mediated controllable intramolecular and intermolecular photocycloadditions assisted by supramolecular templates

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

Science China Chemistry 2022年第6期65卷 1129-1133页

作者： Yi-Shou Wang Li-ying Sun Yao-Yu Wang ying-feng Han Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education Xi’an Key Laboratory of Functional Supramolecular Structure and MaterialsCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an710127China

Understanding and controlling supramolecular template effect assembly via a photochemical reaction in different solid and solution phases is one of the main topics in photochemistry. Here, an interesting case of phase-mediated controllable intramolecular/intermolecular photochemical [2+2] cycloadditions assisted by supramolecular templates was demonstrated. Direct irradiation of the complexes in solution yields intramolecular photoproducts exclusively, whereas exposure of the solid powder sample under the same conditions yields intermolecular dinuclear species quantitatively. The nature of the phase and supramolecular interaction affects the geometrical arrangements of the metallacycles, leading to different cycloaddition products under photoirradiation. The crystal structures of different products were investigated by single-crystal X-ray diffraction, nuclear magnetic resonance(NMR) spectrometry, and electrospray ionization mass spectrometry(ESI-MS).

关键词： N-heterocyclic carbene photochemical cycloaddition template synthesis topochemistry stacking interactions

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

共价有机框架材料在金属分离富集中的应用

分析测试学报 2025年第1期44卷 51-60页

作者：李松涛董少锋林月琳孙颖林子俺福州大学化学学院食品安全与生物分析教育部重点实验室福建福州350108

随着工业的发展,重金属及放射性物质的污染加剧,同时对稀有金属的需求上升,因此对金属进行分离富集非常必要。共价有机框架材料(COFs)具有比表面积大、孔隙率高、结晶度高和孔径可调等特点,在金属分离富集领域展现出巨大潜力。通过结合... 详细信息

随着工业的发展,重金属及放射性物质的污染加剧,同时对稀有金属的需求上升,因此对金属进行分离富集非常必要。共价有机框架材料(COFs)具有比表面积大、孔隙率高、结晶度高和孔径可调等特点,在金属分离富集领域展现出巨大潜力。通过结合特定官能团,能够提高COFs对某些金属离子的选择性,COFs材料稳定的共价键连接方式也增强了其在恶劣环境中的稳定性。鉴于此,该文对近年来COFs在金属分离富集中的应用进行了综述,重点对COFs的不同连接方式,及其在贵金属、重金属、稀土元素和放射性元素中的分离富集以及吸附机理进行介绍。最后对COFs在金属分离富集中存在的挑战进行分析,并对未来的研究趋势进行了展望。

关键词：共价有机框架分离富集金属

Microstructure Recrystallization and Mechanical Properties of a Cold-Rolled TiNbZrTaHf Refractory High-Entropy Alloy

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 633-647页

作者： Chuan Rong Jieren Yang Xiaoliang zhao Ke Huang ying Liu xiaohong Wang Dongdong zhu Ruirun Chen College of Materials Science and Engineering Sichuan UniversityChengdu610065China Key Laboratory of Air-Driven Equipment Technology of zhejiang Province Quzhou UniversityQuzhou324000China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China

The equiatomic TiNbZrTaHf alloy was successfully rolled at room temperature with the reduction of ~ 85%. The microstructure and tensile properties were investigated after cold working and annealing. It was determined that the recrystallization temperature of the TiNbZrTaHf alloy between 850 and 900 ℃. Complete recrystallization and normal grain growth occurred, the high stability of single phase was maintained after annealing at 1000, 1200, and 1400 ℃. But the precipitated phase appeared after long term annealing, as seen after 500 h at 1000 ℃. After cold working, the tensile strength and the elongation of TiNbZrTaHf were 1137 MPa and 25.1%, respectively. The annealed alloy has a high tensile strength (σ_(b )= 863 MPa) and ductility (ε_(e )= 28.5%). Moreover, the oxidation of TiNbZrTaHf alloy at elevated temperatures has a significant impact on its mechanical properties. The poor oxidation resistance of TiNbZrTaHf can accelerate tensile failure by inducing fractures at grain boundaries.

关键词： Refractory high entropy alloy Cold rolling Recrystallization Oxidation resistance Mechanical properties

Threshold Selection and Resource Allocation for Quantized Identification

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

Journal of Systems Science & Complexity 2024年第1期37卷 204-229页

作者： WANG ying LI Xin zhAO Yanlong zhANG Ji-feng Key Laboratory of Systems and Control Institute of Systems ScienceAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

This paper is concerned with the optimal threshold selection and resource allocation problems of quantized identification, whose aims are improving identification efficiency under limited resources. Firstly, the first-order asymptotically optimal quantized identification theory is extended to the weak persistent excitation condition. Secondly, the characteristics of time and space complexities are established based on the Cramér-Rao lower bound of quantized systems. On these basis, the optimal selection methods of fixed thresholds and adaptive thresholds are established under aperiodic signals, which answer how to achieve the best efficiency of quantized identification under the same time and space complexity. In addition, based on the principle of maximizing the identification efficiency under a given resource, the optimal resource allocation methods of quantized identification are given for the cases of fixed thresholds and adaptive thresholds, respectively, which show how to balance time and space complexity to realize the best identification efficiency of quantized identification.

关键词： Quantized output resource allocation system identification threshold selection.

Background dominant colors extraction method based on color image quick fuzzy c-means clustering algorithm

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第5期17卷 1782-1790页

作者： Zun-yang Liu feng Ding ying Xu Xu Han College of Electronic Engineering National University of Defense TechnologyNo.460Huangshan RoadShushan DistrictHefeiAnhui230037China

A quick and accurate extraction of dominant colors of background images is the basis of adaptive camouflage *** paper proposes a Color Image Quick Fuzzy C-Means(CIQFCM)clustering algorithm based on clustering spatial ***,the clustering sample space was mapped from the image pixels to the quantized color space,and several methods were adopted to compress the amount of clustering ***,an improved pedigree clustering algorithm was applied to obtain the initial class ***,CIQFCM clustering algorithm was used for quick extraction of dominant colors of background *** theoretical analysis of the effect and efficiency of the CIQFCM algorithm,several experiments were carried out to discuss the selection of proper quantization intervals and to verify the effect and efficiency of the CIQFCM *** results indicated that the value of quantization intervals should be set to 4,and the proposed algorithm could improve the clustering efficiency while maintaining the clustering *** addition,as the image size increased from 128×128 to 1024×1024,the efficiency improvement of CIQFCM algorithm was increased from 6.44 times to 36.42 times,which demonstrated the significant advantage of CIQFCM algorithm in dominant colors extraction of large-size images.

关键词： Dominant colors extraction Quick clustering algorithm Clustering spatial mapping Background image Camouflage design

Numerical analysis for the effcacy of nasal surgery in obstructive sleep apnea hypopnea syndrome

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2014年第2期30卷 250-258页

作者： Shen Yu ying-Xi Liu Xiu-zhen Sun ying-feng Su ying Wang Yin-zhe Gai State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Department of Otorhinalaryngology The Second Affiliated Hospital of Dalian Medical University

In the present study, we reconstructed upper airway and soft palate models of 3 obstructive sleep apnea-hypopnea syndrome（OSAHS） patients with nasal obstruction. The airflow distribution and movement of the soft palate before and after surgery were described by a numerical simulation method. The curative effect of nasal surgery was evaluated for the three patients with OSAHS. The degree of nasal obstruction in the 3 patients was improved after surgery. For 2 patients with mild OSAHS, the upper airway resistance and soft palate displacement were reduced after surgery. These changes contributed to the mitigation of respiratory airflow limitation. For the patient with severe OSAHS, the upper airway resistance and soft palate displacement increased after surgery, which aggravated the airway obstruction. The effcacy of nasal surgery for patients with OSAHS is determined by the degree of improvement in nasal obstruction and whether the effects on the pharynx are beneficial. Numerical simulation results are consistent with the polysomnogram（PSG） test results, chief complaints, and clinical findings, and can indirectly reflect the degree of nasal patency and improvement of snoring symptoms, and further,provide a theoretical basis to solve relevant clinical problems.

关键词： Nasal surgery Obstructive sleep apnea hypop-nea syndrome Fluid-solid interaction Numerical analysis