检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

基于心率变异性的飞行员脑力负荷特征

科学技术与工程 2024年第13期24卷 5634-5641页

作者：张宁宁陈飒沈阳航空航天大学设计艺术学院沈阳110136

为了探索五边飞行不同阶段飞行员脑力负荷水平,寻找表征脑力负荷的心电指标,对飞行学员展开五边飞行任务的六自由度模拟飞行实验,测量飞行过程中的脑力负荷水平,采集不同飞行阶段飞行员心电各指标数据,利用因子分析构建飞行员脑力负荷模... 详细信息

为了探索五边飞行不同阶段飞行员脑力负荷水平,寻找表征脑力负荷的心电指标,对飞行学员展开五边飞行任务的六自由度模拟飞行实验,测量飞行过程中的脑力负荷水平,采集不同飞行阶段飞行员心电各指标数据,利用因子分析构建飞行员脑力负荷模型,分析和验证不同飞行阶段飞行员脑力负荷的变化特征。结果表明:相比心率指标,心率变异性指标在测量飞行员脑力负荷时具有更高的信度和效度;起飞和上升阶段的脑力负荷处于较低水平并呈下降趋势;巡航阶段的脑力负荷水平较低且变化趋势平滑;进近着陆阶段的脑力负荷水平最高。此外,突发事件会显著影响脑力负荷,引起飞行员脑力负荷的显著增加。

关键词：飞行员五边飞行心率变异性脑力负荷因子分析

Modeling the Spatio-Temporal dynamics of Local Context for a Contextualized diffusion of Agroecological Intensification Options in Niger

在线全文

学校读者我要写书评

暂无评论

International Journal of Geosciences 2024年第3期15卷 270-301页

作者： Nouhou salifou Jangorzo Maud Loireau Abou-Souﬁanou sadda Ousmane sami Mari Abdoul-Aziz saïdou Hassane Bil-Assanou Issoufou département des Sciences du Sol et Télédétection Université Dan Dicko Dankoulodo de Maradi UMR DAP Maradi Niger Unité mixte de recherche diversité et Adaptation des Plantes (UMr dAP) Université Dan Dicko Dankoulodo de Maradi Maradi Niger Institut de recherche pour le développement UMR Espace-DEV Université de Perpignan Via Domitia (UPVD) Perpignan France Institut de recherche pour le développement Représentation Niamey Niger Centre Imaan de Support en recherche Transdisciplinaire UMR DAP/UDDM Niamey Niger département des Sciences et Techniques de Productions Végétales Université Dan Dicko Dankoulodo de Maradi UMR DAP Maradi Niger

Spatio-temporal variability and dynamics in sahelian agro-pastoral zones make each local situation a special case. These specificities must be considered to guide the dissemination of agricultural options with a view to sustainable development. The territorial scale of municipalities is not sufficient for this necessary contextualization;the scale of the “village terroir” seems to be a better option. This is the hypothesis we put forward in the framework of the Global Collaboration for resilient Food Systems program (CrFS), i.e. local context is spatially defined by village terroir. The study is based on data collected through participatory mapping and surveys in “village terroirs” in three regions of Niger (Maradi, dosso and Tillabéri). Then the links between farm managers and their cultivated land, as well as the spatio-temporal dynamics of local context are analyzed. This study provides evidence of the existence and functional usefulness of the village terroir for farmers, their land management and their activities. It demonstrates the usefulness of contextualizing agricultural options at this scale. Their analysis elucidates the links between “terroirs village” and the specific functioning of the agrosocio-ecosystems acting on each of them, thus laying the systemic and geographical foundations for a model of the spatio- temporal dynamics of “village terroirs”. This initial work has opened up new perspectives in modeling and sustainable development.

关键词： Niger Option by Context Local Condition Complex System Multiscale Conceptual Modeling

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

空间分布系列球壳声场耦合与辐射特性研究

船舶力学 2024年第1期28卷 129-143页

作者：李凯俞白兮俞孟萨白振国中国船舶科学研究中心江苏无锡214082 深海技术科学太湖实验室江苏无锡214082 船舶振动噪声重点实验室江苏无锡214082

针对大深度载人潜器的多球壳组合结构,以水介质中任意空间分布的系列弹性球壳为研究对象,利用球函数平移加法定理,建立计及球壳间声场相互作用的多球壳系统声振耦合模型,计算分析空间分布系列球壳的声场耦合特性及其影响因素。结果表明... 详细信息

针对大深度载人潜器的多球壳组合结构,以水介质中任意空间分布的系列弹性球壳为研究对象,利用球函数平移加法定理,建立计及球壳间声场相互作用的多球壳系统声振耦合模型,计算分析空间分布系列球壳的声场耦合特性及其影响因素。结果表明:声场相互作用将改变球壳模态间耦合关系,使得单阶模态对球壳振动的贡献不再限于单个峰值,进而影响声辐射频谱特征;双球壳系统受激球壳和非受激球壳都产生声辐射,轴向激励情况下,两球壳间存在强声场耦合效应,激励力偏离轴向时,声场耦合效应逐渐减弱;不同尺度球壳组成的双球壳系统扩展了声场有效耦合的频率范围,辐射声场兼具两个球壳的模态特征;多球壳串列布置时,声场耦合效应具有传递作用,多球壳按不同角度分散布置时,辐射声场空间分布则更趋复杂。

关键词：球壳组合结构空间声场分布声场相互作用辐射声功率

Analysis and optimal synthesis of single loop spatial mechanisms

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第9期12卷 665-679页

作者： Med Amine LArIBI Lotfi rOMdHANE sad ZEGHLOUL Laboratoire de Génie Mécanique LAB-MA-05 Ecole Nationale d'Ingénieurs de Sousse Institut Pprime-UPr 3346 CNRS-Université de Poitiers-ENSMA Département Génie Mécanique et Systémes Complexes SP2MIBP30179 86962 Futuroscope France

In this work, a systematic approach is presented to obtain the input-output equations of a single loop 4-bar spatial mechanisms. The dialytic method along with denavit-Hartenberg parameters can be used to obtain these equations efficiently. A genetic algorithm （GA） has been used to solve the problem of spatial mechanisms synthesis. Two types of mechanisms, e.g., rSCr and rSPC （r： revolute; S： spherical; C： cylindrical; P： prismatic）, have illustrated the application of the GA to solve the problem of function generation and path generation. In some cases, the GA method becomes trapped in a local minimum. A combined GA-fuzzy logic （GA-FL） method is then used to improve the final result. The results show that GAs, combined with an adequate description of the mechanism, are well suited for spatial mechanism synthesis problems and have neither difficulties inherent to the choice of the initial feasible guess, nor a problem of convergence, as it is the case for deterministic methods.

关键词： Spatial mechanisms Genetic algorithm-fuzzy logic (GA-FL) method denevit-Hartenberg parameters Mechanism synthesis

信迪利单抗联合dA-EPOCH-r方案治疗弥漫大B细胞淋巴瘤的效果分析

在线全文

学校读者我要写书评

暂无评论

临床研究 2024年第9期32卷 11-14页

作者：刘飒南阳市中心医院肿瘤内科三病区河南南阳473000

目的探究弥漫大B细胞淋巴瘤(dLBCL)联合应用环磷酰胺+表柔比星+依托泊苷+长春新碱+泼尼松+利妥昔单抗(dA-EPOCH-r)方案与信迪利单抗的具体效果。方法选取2020年1月至2023年12月南阳市中心医院肿瘤内科收入诊治的82例dLBCL病例,以治疗方... 详细信息

目的探究弥漫大B细胞淋巴瘤(dLBCL)联合应用环磷酰胺+表柔比星+依托泊苷+长春新碱+泼尼松+利妥昔单抗(dA-EPOCH-r)方案与信迪利单抗的具体效果。方法选取2020年1月至2023年12月南阳市中心医院肿瘤内科收入诊治的82例dLBCL病例,以治疗方案的不同,将其分为研究组(n=41,信迪利单抗+dA-EPOCH-r方案),对照组(n=41,单纯应用dA-EPOCH-r方案),分析其疗效、血清标志物、免疫指标及并发症差异。结果研究组客观缓解率(Orr),疾病控制率(dCr)均高于对照组,差异均有统计学意义(P0.05),治疗后,两组血清标志物、免疫指标指标均降低,且研究组低于对照组,差异均有统计学意义(P0.05)。结论dLBCL治疗期间,联合应用dA-EPOCH-r方案与信迪利单抗能够取得较为理想的临床疗效,改善血清标志物以及免疫指标,不会额外增加并发症发生率,具有临床应用意义。

关键词：信迪利 dA-EPOCH-r方案弥漫大B细胞淋巴瘤疗效

探讨健康教育联合心理护理对更年期综合征患者生活质量、焦虑及抑郁情绪的影响

在线全文

学校读者我要写书评

暂无评论

实用妇科内分泌电子杂志 2024年第1期11卷 112-114页

作者：张飒陕西财经职业技术学院陕西咸阳712000

目的探讨健康教育联合心理护理对女性更年期综合征患者生活质量、焦虑及抑郁情绪的影响。方法选取100例更年期综合征患者,采用随机数字表法将其分为观察组与对照组,每组50例。对照组患者应用常规护理,观察组患者应用健康教育联合心理护... 详细信息

目的探讨健康教育联合心理护理对女性更年期综合征患者生活质量、焦虑及抑郁情绪的影响。方法选取100例更年期综合征患者,采用随机数字表法将其分为观察组与对照组,每组50例。对照组患者应用常规护理,观察组患者应用健康教育联合心理护理干预。比较两组患者干预前后临床效果。结果观察组患者干预后盗汗、失眠、健忘、烦躁评分均低于对照组(P<0.05)。两组患者干预后焦虑、抑郁评分均较干预前降低,观察组各项评分低于对照组(P<0.05)。观察组患者干预后生活质量评分(2.57±1.13)分明显低于对照组的(5.21±2.04)分(P<0.05)。结论更年期综合征患者采用健康教育联合心理护理进行干预,有助于改善患者焦虑、抑郁的负性情绪,提高生活质量,具有临床应用价值。

关键词：健康教育更年期综合征生活质量

Analysing the Potential Impact of Climate Change on the Hydrological regime of the Upper Benue river Basin (North Cameroon)

在线全文

学校读者我要写书评

暂无评论

Journal of Water resource and Protection 2024年第8期16卷 569-583页

作者： Elisabeth dassou Fita Auguste Ombolo thierry C. Fotso-Nguemo daniel Bogno saïdou Augustin daïka Steven Chouto Felix Abbo Mbele department of Meteorology and Hydrology The National Advanced School of Engineering of Maroua The University of Maroua Maroua Cameroon Higher Institute of Agriculture Wood Water and Environment The University of Ebolowa Ebolowa Cameroun department of Hydraulics and Water Management The National Advanced School of Engineering of Maroua The University of Maroua Maroua Cameroon Climate Change research Laboratory (CCrL) National Institute of Cartography Yaoundé Cameroon department of Geography Faculty of Arts Letters and Social Sciences University of Maroua Maroua Cameroon

In this study, we analyse the climate variability in the Upper Benue basin and assess its potential impact on the hydrology regime under two different greenhouse gas emission scenarios. The hydrological regime of the basin is more vulnerable to climate variability, especially precipitation and temperature. Observed hydroclimatic data (1950-2015) was analysed using a statistical approach. The potential impact of future climate change on the hydrological regime is quantified using the Gr2M model and two climate models: HadGEM2-ES and MIrOC5 from CMIP5 under rCP 4.5 and rCP 8.5 greenhouse gas emission scenarios. The main result shows that precipitation varies significantly according to the geographical location and time in the Upper Benue basin. The trend analysis of climatic parameters shows a decrease in annual average precipitation across the study area at a rate of -0.568 mm/year which represents about 37 mm/year over the time 1950-2015 compared to the 1961-1990 reference period. An increase of 0.7°C in mean temperature and 14% of PET are also observed according to the same reference period. The two climate models predict a warming of the basin of about 2°C for both rCP 4.5 and 8.5 scenarios and an increase in precipitation between 1% and 10% between 2015 and 2100. Similarly, the average annual flow is projected to increase by about +2% to +10% in the future for both rCP 4.5 and 8.5 scenarios between 2015 and 2100. Therefore, it is primordial to develop adaptation and mitigation measures to manage efficiently the availability of water resources.

关键词： Climate Variability Hydrological Modelling Climate Models Upper Benue Basin Northern Cameroon

Identification of origin of insulating polymer maneuvered photoredox catalysis

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

Chinese Journal of Catalysis 2024年第8期63卷 109-123页

作者： Qiao-Ling Mo rui Xiong Jun-Hao dong Bai-Sheng sa Jing-Ying Zheng Qing Chen Yue Wu Fang-Xing Xiao College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108FujianChina

Solid non-conjugated polymers have long been regarded as insulators due to deficiency of delocalizedπelectrons along the molecular chain *** to date,origin of insulating polymer regulated charge transfer has not yet been *** this work,we unleash the root origin of charge transport capability of insulating polymer in *** ascertain that insulating polymer plays crucial roles in fine tuning of electronic structure of transition metal chalcogenides(TMCs),which mainly include altering surface electron density of TMCs for accelerating charge transport kinetics,triggering the generation of defect over TMCs for prolonging carrier lifetime,and acting as hole-trapping mediator for retarding charge *** synergistic roles contribute to the charge transfer of insulating *** work opens a new vista of utilizing solid insulating polymers for maneuvering charge transfer toward solar energy conversion.

关键词： Insulating polymer Charge transfer Photoredox catalysis Polyelectrolyte Self-assembly

Hepatocellular carcinoma-the role of the underlying liver disease in clinical practice

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第19期30卷 2488-2495页

作者： Angelo Zambam de Mattos Isadora Zanotelli Bombassaro Arndt Vogel Jose d debes department of Internal Medicine Universidade Federal de Ciências da Saúde de Porto AlegreRSPorto Alegre 90020090Brazil Graduate Program in Medicine:Hepatology Federal University of Health Sciences of Porto AlegreRSPorto Alegre 90050-170Brazil division of Gastroenterology Hepatology University of TorontoHannover M5R 0A3Canada department of Medicine University of MinnesotaMinneapolisMN 55455United States

Hepatocellular carcinoma(HCC)is one of the most common causes of cancerrelated *** particular type of cancer has the distinctive characteristic of mostly happening in individuals with an underlying liver *** makes the management of patients more challenging,since physicians must take into consideration two different conditions,the chronic liver disease and the *** underlying liver disease has several implications in clinical practice,because different kinds of chronic liver disease can lead to varying degrees of risk of developing HCC,obstacles in surveillance,and differences in the efficacy of the treatment against HCC.A shift in the prevalence of liver diseases has been evident over the last few years,with viral hepatitis gradually losing the leading position as cause of HCC and metabolic dysfunction-associated steatotic liver disease gaining ***,in an era of personalized medicine,it is imperative that physicians are aware of the underlying liver disease of individuals with HCC and its impact in the management of their tumors.

关键词： Hepatocellular carcinoma Etiology Epidemiology Surveillance Therapy