期刊文献+
共找到1,912篇文章
< 1 2 96 >
每页显示 20 50 100
Progesterone regulates tissue non-specific alkaline phosphatase(TNSALP)expression and activity in ovine utero-placental tissues
1
作者 Claire Stenhouse Katherine M.Halloran +7 位作者 Emily C.Hoskins Robyn M.Moses Guoyao Wu Heewon Seo Gregory A.Johnson Larry J.Suva Dana Gaddy Fuller W.Bazer 《Journal of Animal Science and Biotechnology》 CSCD 2024年第6期2262-2275,共14页
Background Tissue non-specific alkaline phosphatase(TNSALP;encoded by the ALPL gene)has a critical role in the postnatal regulation of p hospliate homeostasis,yet how TNSALP activity and expression are regulated durin... Background Tissue non-specific alkaline phosphatase(TNSALP;encoded by the ALPL gene)has a critical role in the postnatal regulation of p hospliate homeostasis,yet how TNSALP activity and expression are regulated during pregnancy remain largely unknown.This study tested the hypothesis that progesterone(P4)and/or interferon tau(IFNT)regulate TNSALP activity during pregnancy in sheep.Methods In Exp.1,ewes were bred and received daily intramuscular injections of either corn oil vehicle(CO)or 25 mg progesterone in CO(P4)for the first 8 days of pregnancy and were hysterectomized on either Day 9,12,or 125 of gestation.In Exp.2,ewes were fitted with intrauterine catheters on Day 7 of the estrous cycle and received daily intramuscular injections of 50 mg P4 in CO and/or 75 mg progesterone receptor antagonist(RU486)in CO from Days 8 to 15,and twice daily intrauterine injections of either control proteins(CX)or IFNT(25μg/uterine horn/d)from Days 11 to 15(treatment groups:P4+CX;P4+IFNT;RU486+P4+CX;and RU486+P4+IFNT)and were hysterectomized on Day 16.Results In Exp.1,endometria from ewes administered P4 had greater expression of ALPL mRNA than ewes administered CO on Day 12.TNSALP activity appeared greater in the epithelia,stratum compactum stroma,and endothelium of the blood vessels in the endometrium and myometrium from ewes administered P4 than ewes administered CO on Day 12.On Day 125,TNSALP activity localized to uterine epithelial and endothelial cells,independent of P4 treatment.TNSALP activity in placentomes appeared greater in P4 treated ewes and was detected in endothelial cells and caruncular tissue in P4 treated but not CO treated ewes.In Exp.2,endometrial homogenates from ewes administered RU486+P4+CX had lower TNSALP activity those for P4+CX and P4+IFNT ewes.Immunoreactive TNSALP protein appeared greater in the mid-and deep-glandular epithelia in RU486+P4+CX treated ewes as compared to the other treatment groups.Enzymatic activity appeared greater on the apical surface of the deep glandular epithelia in endometria from ewes treated with RU486+P4+CX compared to the other treatment groups.Conclusions These results suggest that P4,but not IFNT,regulates the expression and activity of TNSALP in uteroplacental tissues and has the potential to contribute to the regulation of phosphate availability that is critical for conceptus development during pregnancy. 展开更多
关键词 Alkaline phosphatase Phosphate PLACENTA Sheep UTERUS
下载PDF
TNS公布全球企业声誉研究结果
2
《市场研究》 2005年第2期8-8,共1页
关键词 全球企业 企业声誉 公布 关系管理 供应商 市场信息 看法 研究结果 调查 四季
下载PDF
TONY COWLING出任TNS总裁并被授予MRS金牌勋章
3
《市场研究》 2006年第2期64-64,共1页
关键词 总裁 MRS 勋章 金牌 授予 首席执行官 公司发展 信息产业 主席 伦敦
下载PDF
TNS全球创新中心推出“顾客价值优化系统”
4
《市场研究》 2007年第7期61-61,共1页
全球领先的市场研究公司TNS近日宣布在全球推广“顾客价值优化系统”,这是TNS在2007年推出的一项全新调查工具。“顾客价值优化系统”可以帮助市场决策人员对营销投资方案进行评估,确定如何投资能够获取最大利润。“顾客价值优化系统”... 全球领先的市场研究公司TNS近日宣布在全球推广“顾客价值优化系统”,这是TNS在2007年推出的一项全新调查工具。“顾客价值优化系统”可以帮助市场决策人员对营销投资方案进行评估,确定如何投资能够获取最大利润。“顾客价值优化系统”可以将客户信息与消费者的品牌概念、品牌转换和购物行为等调查资料结合起来, 展开更多
关键词 优化系统 顾客价值 创新中心 市场研究公司 投资方案 品牌概念 决策人员 最大利润
下载PDF
BARB正式改签TNS,为其提供6年电视受众研究服务
5
《市场研究》 2008年第1期63-63,共1页
BARB(英国广播受众研究委员会)近日宣布全球领先的市场研究与资讯集团TNS(中国CSM媒介研究外方股东)赢得了英国电视受众研究的两个重要合约,合约自2010年起生效。
关键词 电视受众研究 服务 媒介研究 市场研究 CSM 委员会 合约 英国
下载PDF
“危”中有“机”——TNS研究揭示消费者金融理财新需求
6
《市场研究》 2009年第4期61-61,共1页
萧条、破产、失业……面对金融危机带来的一系列负面影响,欧美的消费者们现在也不得不变着法儿在危机中“明哲保身”。全球领先市场研究公司TNS近日推出的《金融危机研究》指出,57%的欧美消费者正在逐渐改变自己的理财方式,他们或... 萧条、破产、失业……面对金融危机带来的一系列负面影响,欧美的消费者们现在也不得不变着法儿在危机中“明哲保身”。全球领先市场研究公司TNS近日推出的《金融危机研究》指出,57%的欧美消费者正在逐渐改变自己的理财方式,他们或者将钱存入不同的银行,或者把存款统统兑现.或者干脆“炒掉”自己原来一直使用的银行,重新寻觅能够帮助他们更好规避风险的投资机构…… 展开更多
关键词 消费者 金融理财 “明哲保身” 市场研究公司 金融危机 负面影响 理财方式 投资机构
下载PDF
TNS中国与CTR市场研究合并双方的固定样本组连续研究服务
7
《市场研究》 2008年第2期63-63,共1页
世界领先的市场研究公司TNS 2008年1月18日宣布.TNS中国的连续研究服务部门“TNS Worldpanel中国”与TNS合资公司CTR市场研究的“固定样本组连续研究服务”已经合并。此次整合产生了中国地区同类业务的新霸主。
关键词 市场研究公司 中国地区 连续研究 服务部门 固定样本 合并 合资公司 同类
下载PDF
Women in visual neural regeneration research
8
作者 Tonia S.Rex David J.Calkins 《Neural Regeneration Research》 SCIE CAS 2025年第2期489-490,共2页
The year 2024 marks the 60^(th)anniversary of Title IX and 25 years since the New York Times revealed bias against female faculty members at the Massachusetts Institute of Technology.We take an opportunity here to exa... The year 2024 marks the 60^(th)anniversary of Title IX and 25 years since the New York Times revealed bias against female faculty members at the Massachusetts Institute of Technology.We take an opportunity here to examine the state of gender bias in a relatively new yet already prominent field,neural regeneration in the visual system,for which there is a well-defined context useful for this purpose.The National Eye Institute(NEI)provided the first round of research funding for its Audacious Goals Initiative(AGI)on visual neural regeneration in 2013 and the last round in 2021.Therefore,we focus on this timespan.Data sources included PubMed,the National Science Foundation(NSF),the NEI,the Blue Ridge Institute for Medical Research and data from the major professional organization for eye and vision research,the Association for Research in Vision and Ophthalmology(ARVO). 展开更多
关键词 NEURAL VISUAL TIMES
下载PDF
Cortical hem signaling center: functions, development, and potential implications for evolution and brain disorders
9
作者 Victor V.Chizhikov Igor Y.Iskusnykh 《Neural Regeneration Research》 SCIE CAS 2025年第4期1079-1080,共2页
Development of the telencephalon relies upon several signaling centers-localized cellular populations that supply secreted factors to pattern the cortical neuroepithelium.One such signaling center is the cortical hem,... Development of the telencephalon relies upon several signaling centers-localized cellular populations that supply secreted factors to pattern the cortical neuroepithelium.One 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 mice.The cortical hem produces several types of secreted molecules,including wingless-related integration site(Wnt)and bone morphogenetic(Bmp)proteins.The 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). 展开更多
关键词 EPITHELIUM FIGURE CENTER
下载PDF
Voices that matter:The impact of patient-reported outcome measures on clinical decision-making
10
作者 Naveen Jeyaraman Madhan Jeyaraman +2 位作者 Swaminathan Ramasubramanian Sangeetha Balaji Sathish Muthu 《World Journal of Methodology》 2025年第2期54-61,共8页
The critical role of patient-reported outcome measures(PROMs)in enhancing clinical decision-making and promoting patient-centered care has gained a profound significance in scientific research.PROMs encapsulate a pati... The critical role of patient-reported outcome measures(PROMs)in enhancing clinical decision-making and promoting patient-centered care has gained a profound significance in scientific research.PROMs encapsulate a patient's health status directly from their perspective,encompassing various domains such as symptom severity,functional status,and overall quality of life.By integrating PROMs into routine clinical practice and research,healthcare providers can achieve a more nuanced understanding of patient experiences and tailor treatments accordingly.The deployment of PROMs supports dynamic patient-provider interactions,fostering better patient engagement and adherence to tre-atment plans.Moreover,PROMs are pivotal in clinical settings for monitoring disease progression and treatment efficacy,particularly in chronic and mental health conditions.However,challenges in implementing PROMs include data collection and management,integration into existing health systems,and acceptance by patients and providers.Overcoming these barriers necessitates technological advancements,policy development,and continuous education to enhance the acceptability and effectiveness of PROMs.The paper concludes with recommendations for future research and policy-making aimed at optimizing the use and impact of PROMs across healthcare settings. 展开更多
关键词 Patient-reported outcome measures Clinical decision-making Patient-centered care Healthcare technology Data management Policy development
下载PDF
A Multi-Task Learning Framework for Joint Sub-Nyquist Wideband Spectrum Sensing and Modulation Recognition
11
作者 Dong Xin Stefanos Bakirtzis +1 位作者 Zhang Jiliang Zhang Jie 《China Communications》 2025年第1期128-138,共11页
The utilization of millimeter-wave frequencies and cognitive radio(CR)are promising ways to increase the spectral efficiency of wireless communication systems.However,conventional CR spectrum sensing techniques entail... The utilization of millimeter-wave frequencies and cognitive radio(CR)are promising ways to increase the spectral efficiency of wireless communication systems.However,conventional CR spectrum sensing techniques entail sampling the received signal at a Nyquist rate,and they are not viable for wideband signals due to their high cost.This paper expounds on how sub-Nyquist sampling in conjunction with deep learning can be leveraged to remove this limitation.To this end,we propose a multi-task learning(MTL)framework using convolutional neural networks for the joint inference of the underlying narrowband signal number,their modulation scheme,and their location in a wideband spectrum.We demonstrate the effectiveness of the proposed framework for real-world millimeter-wave wideband signals collected by physical devices,exhibiting a 91.7% accuracy in the joint inference task when considering up to two narrowband signals over a wideband spectrum.Ultimately,the proposed data-driven approach enables on-the-fly wideband spectrum sensing,combining accuracy,and computational efficiency,which are indispensable for CR and opportunistic networking. 展开更多
关键词 automated modulation classification cognitive radio convolutional neural networks deep learning spectrum sensing sub-Nyquist sampling
下载PDF
Insights into gastrointestinal manifestation of human immunodeficiency virus:A narrative review
12
作者 Pratiksha Moliya Anmol Singh +2 位作者 Navdeep Singh Vikash Kumar Aalam Sohal 《World Journal of Virology》 2025年第1期51-62,共12页
Human immunodeficiency virus(HIV)modifies CD4-positive cells,resulting in immunodeficiency and a wide range of gastrointestinal(GI)manifestations.The burden of HIV-related GI illnesses has significantly evolved with t... Human immunodeficiency virus(HIV)modifies CD4-positive cells,resulting in immunodeficiency and a wide range of gastrointestinal(GI)manifestations.The burden of HIV-related GI illnesses has significantly evolved with the widespread use of antiretroviral therapy(ART).While ART has effectively reduced the occurrence of opportunistic infections,it has led to an increase in therapy-related GI illnesses.Common esophageal conditions in HIV patients include gastroesophageal reflux disease,idiopathic esophageal ulcers,herpes simplex virus,cytomegalovirus(CMV),and candidal esophagitis.Kaposi’s sarcoma,a hallmark of acquired immunodeficiency syndrome,may affect the entire GI system.Gastritis and peptic ulcer disease are also frequently seen in patients with HIV.Diarrhea,often linked to both opportunistic infections and ART,requires careful evaluation.Bloody diarrhea,often a sign of colitis caused by bacterial infections such as Shigella or Clostridium difficile,is prevalent.Small bowel lymphoma,although rare,is increasing in prevalence.Anorectal disorders,including proctitis,fissures,and anal squamous cell carcinoma,are particularly relevant in homosexual men,underlining the importance of timely diagnosis.This review comprehensively explores the epidemiology,pathogenesis,and treatment considerations for the various GI disorders associated with HIV,highlighting the importance of accurate diagnosis and effective treatment to improve outcomes for HIV-infected patients. 展开更多
关键词 Human immunodeficiency virus Opportunistic infections Antiretroviral treatment GASTROINTESTINAL
下载PDF
Limited evidence to support demineralized bone matrix in foot and ankle surgical procedures:A systematic review
13
作者 Hayden Hartman James J Butler +6 位作者 Megan Calton Charles C Lin Samantha Rettig Jared C Tishelman Sebastian Krebsbach Grace W Randall John G Kennedy 《World Journal of Orthopedics》 2025年第1期57-67,共11页
BACKGROUND Demineralized bone matrix(DBM)is a commonly utilized allogenic bone graft substitute to promote osseous union.However,little is known regarding outcomes following DBM utilization in foot and ankle surgical ... BACKGROUND Demineralized bone matrix(DBM)is a commonly utilized allogenic bone graft substitute to promote osseous union.However,little is known regarding outcomes following DBM utilization in foot and ankle surgical procedures.AIM To evaluate the clinical and radiographic outcomes following DBM as a biological adjunct in foot and ankle surgical procedures.METHODS During May 2023,the PubMed,EMBASE and Cochrane library databases were systematically reviewed to identify clinical studies examining outcomes following DBM for the management of various foot and ankle pathologies.Data regarding study characteristics,patient demographics,subjective clinical outcomes,radiological outcomes,complications,and failure rates were extracted and analyzed.In addition,the level of evidence(LOE)and quality of evidence(QOE)for each individual study was also assessed.Thirteen studies were included in this review.RESULTS In total,363 patients(397 ankles and feet)received DBM as part of their surgical procedure at a weighted mean follow-up time of 20.8±9.2 months.The most common procedure performed was ankle arthrodesis in 94 patients(25.9%).Other procedures performed included hindfoot fusion,1st metatarsophalangeal joint arthrodesis,5th metatarsal intramedullary screw fixation,hallux valgus correction,osteochondral lesion of the talus repair and unicameral talar cyst resection.The osseous union rate in the ankle and hindfoot arthrodesis cohort,base of the 5th metatarsal cohort,and calcaneal fracture cohort was 85.6%,100%,and 100%,respectively.The weighted mean visual analog scale in the osteochondral lesions of the talus cohort improved from a pre-operative score of 7.6±0.1 to a post-operative score of 0.4±0.1.The overall complication rate was 27.2%,the most common of which was non-union(8.8%).There were 43 failures(10.8%)all of which warranted a further surgical procedure.CONCLUSION This current systematic review demonstrated that the utilization of DBM in foot and ankle surgical procedures led to satisfactory osseous union rates with favorable wound complication rates.Excellent outcomes were observed in patients undergoing fracture fixation augmented with DBM,with mixed evidence supporting the routine use of DBM in fusion procedures of the ankle and hindfoot.However,the low LOE together with the low QOE and significant heterogeneity between the included studies reinforces the need for randomized control trials to be conducted to identify the optimal role of DBM in the setting of foot and ankle surgical procedures. 展开更多
关键词 Demineralized bone matrix Allogenic bone graft osseous union Biological adjunct Systematic review Bone morphogenetic proteins Lower limb fusion ARTHRODESIS
下载PDF
Altered microRNA composition in the uterine lumen fluid in cattle(Bos taurus)pregnancies initiated by artificial insemination or transfer of an in vitro produced embryo
14
作者 Fernando H.Biase Sarah E.Moorey +3 位作者 Julie G.Schnuelle Soren Rodning Martha Sofia Ortega Thomas E.Spencer 《Journal of Animal Science and Biotechnology》 2025年第1期76-91,共16页
Background MicroRNAs(miRNAs)are presented in the uterine lumen of many mammals,and in vitro experiments have determined that several miRNAs are important for the regulation of endometrial and trophoblast functions.Our... Background MicroRNAs(miRNAs)are presented in the uterine lumen of many mammals,and in vitro experiments have determined that several miRNAs are important for the regulation of endometrial and trophoblast functions.Our aim was to identify and contrast the miRNAs present in extracellular vesicles(EVs)in the uterine lumen fluid(ULF)at the onset of attachment in cattle pregnancies(gestation d 18)initiated by artificial insemination(AI)or by the trans-fer of an in vitro-produced blastocyst(IVP-ET).A third group had no conceptus after the transfer of an IVP embryo.Results The abundance of 263 annotated miRNAs was quantified in the EVs collected from ULF.There was an increase in the transcript abundance of 20 miRNAs in the ULF EVs from the AI pregnant group,while 4 miRNAs had a lower abundance relative to the group not containing a conceptus.Additionally,4 miRNAs were more abun-dant in ULF EVs in the AI pregnant group relative to IVP-ET group(bta-mir-17,bta-mir-7-3,MIR7-1,MIR18A).Specific miRNAs in the ULF EVs were co-expressed with messenger RNAs expressed in extra-embryonic tissues and endome-trium,including genes that are known to be their targets.Conclusions The results provide biological insights into the participation of miRNAs in the regulation of trophoblast proliferation and differentiation,as well as in endometrium receptivity.The knowledge that in vitro cultured embryos can contribute to the altered abundance of specific miRNAs in the uterine lumen can lead to the development of cor-rective approaches to reduce conceptus losses during the first month of pregnancy in cattle. 展开更多
关键词 Artificial reproductive technology CATTLE CONCEPTUS Embryos ENDOMETRIUM Small RNA
下载PDF
TNS:揭秘八大品牌引力之源 被引量:1
15
作者 Nitin Nishandar 《中国广告》 2014年第7期86-88,共3页
有一个高IQ值的品牌,就有几百个低IQ值的品牌,那么,怎么成为那个NO.1?2014年5月,来自TNS突破性的新研究揭示品牌引力的真正源泉,并告诉我们究竟为什么全世界都喜欢欧莱雅,红牛和奥迪——以及为何大多数其他品牌几乎从未赢得如此高的欢... 有一个高IQ值的品牌,就有几百个低IQ值的品牌,那么,怎么成为那个NO.1?2014年5月,来自TNS突破性的新研究揭示品牌引力的真正源泉,并告诉我们究竟为什么全世界都喜欢欧莱雅,红牛和奥迪——以及为何大多数其他品牌几乎从未赢得如此高的欢迎度。 展开更多
关键词 品牌 引力 突破性 欧莱雅 Q值 红牛
原文传递
日记的教育价值——朱永新与剑桥大学社会人类学系艾伦•麦克法兰教授的对话 被引量:2
16
作者 朱永新 《华东师范大学学报(教育科学版)》 CSSCI 北大核心 2024年第2期119-126,共8页
作为人们日常生活的重要组成部分,日记不仅是教育生活的记录方式,它也在历史研究和文化塑造中扮演至关重要的角色,但是,有关日记在个人成长、家庭传承、历史研究等方面的教育价值还没有得到充分挖掘。本文通过朱永新与剑桥大学社会人类... 作为人们日常生活的重要组成部分,日记不仅是教育生活的记录方式,它也在历史研究和文化塑造中扮演至关重要的角色,但是,有关日记在个人成长、家庭传承、历史研究等方面的教育价值还没有得到充分挖掘。本文通过朱永新与剑桥大学社会人类学系教授艾伦·麦克法兰进行的对话,重申了日记在作为教育生活的记录方式、作为历史人类学的研究方法、作为促进师生成长的行动路径等方面所具有的重要教育价值,并解释了撰写日记的主要原因以及介绍了周记、月记、书信等日记的其他补充形式,最后结合新教育实验共读共写共同生活的理念提出了共同体写作的日记写作形式。 展开更多
关键词 日记 教育价值 社会人类学 共同体写作
下载PDF
微多普勒辅助的城市环境无人机编队检测方法
17
作者 张杰 朱宇 王洋 《电子与信息学报》 EI CAS CSCD 北大核心 2024年第9期3583-3591,共9页
针对城市复杂环境下电磁环境复杂、多径杂波和干扰信号密集等现象,传统的无人机(UAV)检测方法通过获取回波信号提取目标多普勒信息进行检测,易受到环境影响导致检测效果不理想。该文提出微多普勒辅助的城市环境无人机编队检测方法,充分... 针对城市复杂环境下电磁环境复杂、多径杂波和干扰信号密集等现象,传统的无人机(UAV)检测方法通过获取回波信号提取目标多普勒信息进行检测,易受到环境影响导致检测效果不理想。该文提出微多普勒辅助的城市环境无人机编队检测方法,充分利用无人机的微动特征,能够在复杂环境下提高检测精度。首先,参数化建模表征城市复杂环境下无人机旋翼的雷达回波微多普勒信号,利用YOLOv5s检测微多普勒闪烁脉冲,有效提取位置信息;然后,引入雷达信号分选方法的脉冲重复间隔(PRI)变换,分类获得无人机编队数量;最后,利用Kmeans算法验证无人机编队检测方法的准确性。结果表明,所提方法在信噪比2 dB时7架无人机的检测精度高于90%,能够用于城市复杂环境存在干扰脉冲、多径效应、局部脉冲丢失的无人机编队检测。 展开更多
关键词 无人机编队 编队检测 城市复杂环境 YOLOV5s 微多普勒提取
下载PDF
基于皮肤-脂肪模型的太赫兹体内多输入多输出信道特性分析与建模
18
作者 张杰 尹镜涵 +3 位作者 邵羽 廖希 王洋 余子明 《电子与信息学报》 EI CAS CSCD 北大核心 2024年第4期1276-1285,共10页
为探究太赫兹(THz)频段体内多输入多输出(MIMO)通信系统的传输特性,该文在0.8~1.2 THz下构建了精确的皮肤-脂肪模型,对皮肤-脂肪模型中垂直方向和水平方向的链路进行全波电磁仿真,分析太赫兹体内信道特性,建立路径损耗模型。首先,结合... 为探究太赫兹(THz)频段体内多输入多输出(MIMO)通信系统的传输特性,该文在0.8~1.2 THz下构建了精确的皮肤-脂肪模型,对皮肤-脂肪模型中垂直方向和水平方向的链路进行全波电磁仿真,分析太赫兹体内信道特性,建立路径损耗模型。首先,结合太赫兹频段人体组织的介电特性和人体皮肤的解剖学结构构建皮肤-脂肪模型。其次,对比分析了3条链路的路径损耗和阴影衰落,提出带有等效吸收因子的太赫兹体内路径损耗模型。最后,对3条链路的莱斯K因子、均方根时延扩展、MIMO容量进行分析。仿真分析表明,带有等效吸收因子的太赫兹体内路径损耗模型可以更准确地描述加长距离垂直链路2的路径损耗,发射端在体表可以增强MIMO容量。该文的工作可以为太赫兹体内通信系统的设计和优化提供参考。 展开更多
关键词 太赫兹 体内通信 多输入多输出 信道特性
下载PDF
使用虚拟现实技术提高冰川地貌表达维度的研究
19
作者 刘强 刘金花 +4 位作者 王磊斌 陈鑫 赵志斌 赵晓艳 李英奎 《冰川冻土》 CSCD 2024年第3期1087-1098,共12页
冰川侵蚀与堆积地貌含有重要的古气候、古环境信息,是鉴别冰川作用范围和性质的标志,也是冰川动力学研究的基础。冰川地貌的表达研究经过150多年的发展,已经形成了较完备的冰川地貌制图方案,为冰川形成过程、冰川类型及冰川作用的动力... 冰川侵蚀与堆积地貌含有重要的古气候、古环境信息,是鉴别冰川作用范围和性质的标志,也是冰川动力学研究的基础。冰川地貌的表达研究经过150多年的发展,已经形成了较完备的冰川地貌制图方案,为冰川形成过程、冰川类型及冰川作用的动力学特征判断提供了重要依据。然而,冰川地貌专题图的专业性为古冰川重建和古环境研究提供支撑的同时,也提高了非专业人士的解读难度。以虚拟现实/增强现实地图、混合现实地图、微地图、语义地图和隐喻地图等的泛地图表达机制提供了更多维度的表达方案,在传统的空间几何维度的基础上增加了状态和读图者视角等维度,为冰川地貌表达提供了新的视角。本文使用虚拟现实(virtual reality,VR)技术构建了卡若拉冰川西沟的交互式三维冰川地貌场景,增加了三维、动态和读图者视角等表达维度。通过前期研究工作基础(沉积物特征、测年等工作)对场景内典型的冰川地貌进行标注,将前期冰川地貌的研究认识与VR场景进行较好的对应。该场景可以720°自由变换,包含末次冰盛期-晚冰期、早全新世、新冰期、小冰期和现代冰川共40个分场景,可以激发读图者的沉浸感、交互感和构想感。VR等技术对冰川地貌进行泛地图式的更多维度表达,可以为冰川地貌教学、科普及学术交流提供良好的交互式三维冰川地貌素材,也可以辅助读者更加准确地判别冰川遗迹和认知冰川发育条件。 展开更多
关键词 冰川地貌 虚拟现实 读图者视角 可视化维度 卡若拉冰川
下载PDF
从基础智能到通用智能:基于大模型的GenAI和AGI之现状与展望 被引量:8
20
作者 缪青海 王兴霞 +10 位作者 杨静 赵勇 王雨桐 陈圆圆 田永林 俞怡 林懿伦 鄢然 马嘉琪 那晓翔 王飞跃 《自动化学报》 EI CAS CSCD 北大核心 2024年第4期674-687,共14页
本文对生成式AI(Generative artificial intelligence,GenAI)的国内外发展现状进行了概述,重点分析了中美之间在算力、数据、算法、生态等方面存在的差距.为改变我国在生成式AI领域的落后现状,提出高能效算力建设、联邦数据、专业领域... 本文对生成式AI(Generative artificial intelligence,GenAI)的国内外发展现状进行了概述,重点分析了中美之间在算力、数据、算法、生态等方面存在的差距.为改变我国在生成式AI领域的落后现状,提出高能效算力建设、联邦数据、专业领域模型、基于TAO的联邦生态等应对策略,对大模型时代AI安全治理进行了论述,对通用人工智能(Artificial general intelligence,AGI)的未来发展进行了展望. 展开更多
关键词 生成式人工智能 大语言模型 基础模型 通用人工智能 基础智能 平行智能 SORA
下载PDF
上一页 1 2 96 下一页 到第
使用帮助 返回顶部