都市村庄:南景——一个学术名村的人类学追踪研究

追踪研究了南景这个因杨庆先生的著作而在海外中国研究中颇具影响的学术名村 ,描述了它半世纪以来从深受广州影响的近郊聚落到都市村庄的演进过程。作为珠江三角洲地区乡村都市化的代表 ,在当代背景下对南景的再研究不仅延续了名村的学术生命 ,也使我们目睹了华南乡村社会“农民终结”的动态历程     

从区域史研究重新解读中国历史

2005年12月17～18日，由广东历史学会中国社会经济史专业委员会、香港科技大学华南研究中心、香港华南研究会、中山大学历史系及中山大学历史人类学研究中心联合主办的“中国区域社会之建构”学术研讨会暨2005年华南研究年会在广州中山大学永芳堂召开。本次会议的主题是“中国区域社会之建构”，共有来自全国各地的22位学者提交了报告。会议开幕式由中山大学历史人类学研究中心主任陈春声教授主持，广东历史学会中国社会经济史专业委员会会长叶显恩先生、香港华南研究会会长张瑞威先生在开幕式上作了发言，发言回顾了10年来华南研究会的发展情况，也表达了他们对今后年会发展的期望。     

一种基于像素标记的二值图像区域围线追踪方法

在研究了多种二值图像连通区域围线追踪算法的基础上,提出了一种改进型的二值图像连通区域围线追踪算法。该算法在已有围线追踪算法的基础上,通过定义特定追踪方向,使得追踪过程始终按照逆时针或顺时针方向沿着连通区域边缘进行。在追踪过程中对像素点进行多次标记,通过在按照追踪方向确定的像素点基础上判断像素标记值来确定下一次待追踪像素点的选取。由于对像素点进行多次标记,有效区分了一次追踪像素点和二次追踪像素点,解决了追踪过程中出现的追踪间断现象,使得追踪结果呈现一条完整围线。实验结果表明,此方法可以快速有效地完成二值图像连通区域的围线追踪和提取。     

华南早燕山中晚期挤压构造事件识别及其成矿效应

华南是中国重要的钨、锡、铋、铜、银、锑、汞、稀有、重稀土、金和铅锌多金属重要成矿省,成矿时代以中-新生代为主。众多学者通过野外调查、构造变形解析、科学深钻、年代学研究等方法对华南各个区域进行构造地质学研究,并取得重要成果。但对整个华南中生代构造演化过程的认识依然存在分歧,这主要归咎于不同学者根据局部研究成果或单一地质要素对华南构造演化进行讨论。系统总结前人在华南研究的成果,对华南早燕山期古地层产出状态、古地理变化、古构造应力场、构造变形样式、岩浆记录等多种地质要素进行归纳。初步认为华南早燕山中晚期处于SEE-NWW或近EW向挤压构造背景下,时间界限大致为170~135 Ma,推测挤压事件可能是成矿大爆发开始的前奏,挤压作用将成矿物质预富集,形成矿化区域,为后期成矿作用提供物质基础及成矿有利空间。     

多客体追踪范式下的客体表征连续性模型研究述评

Pylyshyn提出的多客体追踪是探索人类视觉认知领域时空连续性表征的重要研究范式之一.重点回顾了动态情景下对多客体追踪的知觉组织模型、注意焦点转换模型、索引模型、多焦点模型以及多身份-位置捆绑序列模型.最后,分别从注意在追踪过程中的作用、追踪中的信息编码、焦点个数和追踪客体容量四个方面对以往模型进行比较并作简要评价并对这一范式下未来的研究设想提出展望.     

MATLAB在智能监控中的应用

以MATLAB的计算机视觉工具箱为基础,分析了其在视频监控系统中人脸追踪的应用。对静态人脸定位、移动人脸追踪进行研究。人脸追踪采用了CAMShift算法,通过实验发现此算法对简单背景时的追踪效果良好,但存在着一定的局限性,需进一步改进。     

基于门限的广播加密算法改进

为解决数字媒体上的版权问题.对广播加密方案以及能够有效剔除泄密者的泄密者追踪方案做出了深入的研究.采用基于身份的广播加密方案中加入基于门限的泄密者追踪机制的理论分析和实验方法,引入多个密码学哈希函数,并对私钥进行分组处理,实现了基于门限的广播加密及泄密者追踪方案算法的改进.研究结果表明:该算法降低了密文头的大小,压缩了公钥大小,减少了服务器开销,实现了优化叛徒追踪机制,能够推动广播加密技术在实际生活中的使用.     

新冠肺炎疫情下接触者追踪的隐私风险及保护

许多国家政府都发布了抗击新冠肺炎(covid-19)传播的联系人追踪应用程序,旨在帮助卫生官员发现感染者后追踪接触情况.然而,位置追踪应用程序会对用户隐私造成泄露.因此,为了解决接触者追踪对用户隐私影响,分析、讨论、综述了当前接触者追踪中的隐私风险和保护问题,保证在不降低对公共健康有用性的情况下改善隐私泄露问题.希望通过此研究结果,确保移动联系人追踪应用程序的用户隐私,并鼓励政府努力开发有效的替代解决方案,为用户提供更强的隐私保护.     

华南珍稀濒危植物的野外回归研究与应用:先进保育模式 保全珍稀植物

正由华南植物园5个研究组通过8年的多学科联合攻关的"华南珍稀濒危植物的野外回归研究与应用"项目获2012年度广东省科学技术奖一等奖。该成果系统开展了华南地区28种珍稀濒危植物的生态生物学研究及繁殖技术研究,实现了对珍稀濒危植物的有效保护,同时通过区域生态规划及国家战略咨询,建立了珍稀濒危植物野生种群生态恢复的点面结合的产     

网络攻击源追踪技术的分类和展望

网络攻击源追踪技术在实时阻断或隔离攻击、追究相关责任、提供法律举证、威慑攻击者等方面具有非常积极的意义.该文对现有的多种网络攻击源追踪技术进行了系统分类,归纳比较了各种方法的优缺点,并探讨了网络攻击源追踪的进一步研究方向,包括建立量化的评估指标体系、建立网络攻击源追踪的理论模型、考虑诸如多播、移动性、 IPV6、数据加密、结合管理上的特点解决网络攻击源追踪等问题.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.