自监督非等距三维模型簇对应关系计算方法

针对现有非等距三维模型簇对应关系计算方法准确率较低且泛化能力较差的问题,文中提出采用深度内外特征对齐算法的自监督非等距三维模型簇对应关系计算方法.首先,利用DiffusionNet直接学习原始的三维模型特征,获取具有鉴别力的特征描述符.然后,使用深度内外特征对齐算法计算非等距模型对之间的对应关系,采用局部流形调和基作为模型本征信息,并结合笛卡尔坐标等外部信息,实现内外部信息对齐一致,以无监督的方式自动生成对应结果.最后,构建非等距模型簇的加权无向图,根据相似几何模型存在内在相关性的原则,设计自监督多模型匹配算法,不断增强模型图最短路径的循环一致性,获得最优的非等距三维模型簇对应关系.实验表明,文中方法对应关系测地误差较小,结果较准确,能处理模型自身对称性影响对应关系计算的问题,具有良好的泛化能力.

高中生愿望的潜在剖面分析及其预测因子

目的 对高中生愿望进行人群划分,并分析性别、年级、上学方式、体像烦恼和社会媒体压力对高中生愿望潜在类别的预测效应。方法 采用方便抽样,抽取广东省与云南省共4所中学881名高中生,进行愿望指数、体像烦恼及社会媒体压力量表的测评,使用独立样本t检验、单因素方差分析、潜在剖面分析及多因素Logistic回归分析方法进行统计学处理。结果 (1)高中生愿望可划分为2个类型:类别1“低外部-中内部目标”(21.9%)与类别2“中外部-高内部目标”(78.1%)。(2)性别与年龄对愿望的潜在类别具有预测效应(β=0.623,P<0.01;β=0.407,P<0.05)。(3)媒体社会压力对愿望类别具有预测效应(β=0.056,P<0.01)。结论 高中生愿望具有显著的个体差异性与群体异质性。女生、年龄越大以及感知媒体压力越大的高中生,越有可能形成类别2型愿望--“中外部-高内部目标”。两类愿望的具体特征提示,内部、外部目标并不是“非此即彼”的关系,教育者可重点关注与引导两者之间的转化。

新时代海外侨胞参与中国式现代化的动因探析

海外侨胞作为中华民族的重要成员,他们是中国式现代化的参与者、贡献者和见证者。新时代海外侨胞参与中国式现代化,促进经济增长、追求自我利益是其基于生理需要产生的利益动机,铸牢中华民族共同体意识是其基于安全和归属需要产生的情感动机,道义经济约束下履行道德责任是其基于归属和爱的需要产生的道德动机,经济科技实力增强下实现人生价值是其基于尊重和自我实现需要产生的心理动机。此外,当今世情和中国国情的变化、中国侨务政策的吸引、五缘文化的推动是其参与中国式现代化的外部诱因。

小学生英语学习动机与学习成效关系研究

文章通过对小学生进行问卷调查和英语成绩分析,旨在探讨英语学习动机与学习成效的关系,研究发现学习动机对英语学习成效的影响显著。具体而言,内在动机比外在动机更能促进小学生的英语学习成效。同时发现,英语学习动机与学习策略的运用也密切相关,具有高度学习动机的学生更可能采用有效的学习策略。因此,教师在教学过程中应注重激发学生的内在学习动机,并教导他们有效使用学习策略。

Extrinsic and intrinsic mechanisms of axon regeneration:the need for spinal cord injury treatment strategies to address both

Spinal cord injury（SCI）causes disturbances in motor and sensory functions leading to paralysis,the severity of which depends on the spinal level of the injury.Traumatic lesions of spinal cord axon projection tracts are untreatable in human patients,although numerous research groupsworldwide are studying putative treatment strategies.

Characteristics of anomalous Hall effect in spin-polarized two-dimensional electron gases in the presence of both intrinsic,extrinsic,and external electric-field induced spin-orbit couplings

The various competing contributions to the anomalous Hall effect in spin-polarized two-dimensional electron gases in the presence of both intrinsic, extrinsic and external electric-field induced spin-orbit coupling were investigated theoretically. Based on a unified semiclassical theoretical approach, it is shown that the total anomalous Hall conductivity can be expressed as the sum of three distinct contributions in the presence of these competing spin-orbit interactions, namely an intrinsic contribution determined by the Berry curvature in the momentum space, an extrinsic contribution determined by the modified Bloch band group velocity and an extrinsic contribution determined by spin-orbit-dependent impurity scattering. The characteristics of these competing contributions are discussed in detail in the paper.

Small-signal modeling of GaN HEMT switch with a new intrinsic elements extraction method

A novel and accurate method is proposed to extract the intrinsic elements of the GaN high-electron-mobility transistor（HEMT） switch.The new extraction method is verified by comparing the simulated S-parameters with the measured data over the 5-40 GHz frequency range.The percentage errors E（ij） within 3.83% show the great agreement between the simulated S-parameters and the measured data.

Gatifloxacin inducing apoptosis of stromal fibroblasts through cross-talk between caspase-dependent extrinsic and intrinsic pathways

AIM: To reveal the cytotoxicity and related mechanisms of gatifloxacin(GFX) to stromal fibroblasts(SFs) in vitro.METHODS: SFs were treated with GFX at different concentrations(0.009375%-0.3%), and their viability was detected by MTT method. The cell morphology was observed using light/transmission electron microscope. The plasma membrane permeability was measured by AO/EB double-staining. Then cell cycle, phosphatidylserine(PS) externalization, and mitochondrial transmembrane potential(MTP) were analyzed by flow cytometry. DNA damage was analyzed by electrophoresis and immunostaining. ELISA was used to evaluate the caspase-3/-8/-9 activation. Finally, Western blotting was applied for detecting the expressions of apoptosis-related proteins.RESULTS: Morphological changes and reduced viability of GFX-treated SFs demonstrated that GFX above 0.009375% had cytotoxicity to SFs with dependence of concentration and time. GFX-treating cells also showed G1 phase arrest, increased membrane permeability, PS externalization and DNA damage, which indicated that GFX induced apoptosis of SFs. Additionally, GFX could activate the caspase-8, caspase-9, and caspase-3, induce MTP disruption, downregulate B-cell leukemia-2(Bcl-2) and B-cell leukemiaXL(Bcl-XL), and upregulate Bcl-2 assaciated X protein(Bax), Bcl-2-associated death promoter(Bad), Bcl-2 interacting domain(Bid) and cytoplasmic cytochrome C in SFs, suggesting that caspase-dependent extrinsic and intrinsic pathways were related to GFX-contributed apoptosis of SFs.CONCLUSION: The cytotoxicity of GFX induces apoptosis of SFs through triggering the caspase-dependent extrinsic and intrinsic pathways.

Robust visual tracking for manipulators withunknown intrinsic and extrinsic parameters

This paper addresses the robust visual tracking of multi-feature points for a 3D manipulator with unknown intrinsic and extrinsic parameters of the vision system. This class of control systems are highly nonlinear control systems characterized as time-varying and strong coupling in states and unknown parameters. It is first pointed out that not only is the Jacobian image matrix nonsingular, but also its minimum singular value has a positive limit. This provides the foundation of kinematics and dynamics control of manipulators with visual feedback. Second, the Euler angle expressed rotation transformation is employed to estimate a subspace of the parameter space of the vision system. Based on the two results above, and arbitrarily chosen parameters in this subspace, the tracking controllers are proposed so that the image errors can be made as small as desired so long as the control gain is allowed to be large. The controller does not use visual velocity to achieve high and robust performance with low sampling rate of the vision system. The obtained results are proved by Lyapunov direct method. Experiments are included to demonstrate the effectiveness of the proposed controller.

Intrinsic and Extrinsic Automatic Evaluation Strategies for Paraphrase Generation Systems

Paraphrase is an expression of a text with alternative words and orders to achieve a better clarity. Paraphrases have been found vital for augmenting training dataset, which aid to enhance performance of machine learning models that intended for various natural language processing (NLP) tasks. Thus, recently, automatic paraphrase generation has received increasing attention. However, evaluating quality of generated paraphrases is technically challenging. In the literature, the importance of generated paraphrases is tended to be determined by their impact on the performance of other NLP tasks. This kind of evaluation is referred as extrinsic evaluation, which requires high computational resources to train and test the models. So far, very little attention has been paid to the role of intrinsic evaluation in which quality of generated paraphrase is judged against predefined ground truth (reference paraphrases). In fact, it is also very challenging to find ideal and complete reference paraphrases. Therefore, in this study, we propose semantic or meaning oriented automatic evaluation metric that helps to evaluate quality of generated paraphrases against the original text, which is an intrinsic evaluation approach. Further, we evaluate quality of the paraphrases by assessing their impact on other NLP tasks, which is an extrinsic evaluation method. The goal is to explore the relationship between intrinsic and extrinsic evaluation methods. To ensure the effectiveness of proposed evaluation methods, extensive experiments are done on different publicly available datasets. The experimental results demonstrate that our proposed intrinsic and extrinsic evaluation strategies are promising. The results further reveal that there is a significant correlation between intrinsic and extrinsic evaluation approaches.

Manipulating extrinsic and intrinsic obstacles to axonal regeneration after spinal cord injury

Spinal cord injury（SCI）is a traumatic event that can lead to permanent motor and sensory deficits.After the initial trauma,axons of surviving neurons rapidly retract.While there may be a small degree of abortive sprouting,virtually all attempts at robust regrowth across the lesion site ultimately fail.Thus,neurons below the level of the injury are permanently disconnected from their normal input,resulting in persistent loss of function.

Generational Gap： Intrinsic （Non-monetary） Versus Extrinsic （Monetary） Rewards in the Workforce

Traditionally, organizations assume that compensation/pay and monetary benefits are what all employees need to work harder, be productive, or remain with the company. According to Abraham Maslow, within every person is a hierarchy of five needs： physiological needs, safety needs, social needs, esteem needs, and self-actualization needs Organizations must be able to identify what employees desire to secure optimum performance and to meet the needs of both employees and employers. This research focuses on the generational gap and the significance of intrinsic and extrinsic rewards in the workforce. The purpose and objective of this research are to test the significance of monetary versus non-monetary rewards among the different generations in the organization. A self-designed questionnaire distributed to a multi-generational group of employees of selected organizations was used to collect the analyzed data. Sixty-five （65%） responses were obtained. Secondary data were used to elucidate the needs in this area of study. Because the workforce is predicted to become more diverse in terms of age, organizations will be unlikely to implement one set of rewards for the multiple generations. This is due to the differing expectations and requirements among the generations. However, the results indicate no significant difference in monetary versus non-monetary rewards among the different generations in the workforce.

Intrinsic Value of the Natural Environment： An Ethical Roadmap to Protect the Environment

The environment in the sense of all the ecosystems on Earth, has been polluted, harmed, and put at risk of degradation to some extent. Nevertheless, the mainstream ethical philosophies have found it difficult to assign an intrinsic value to the environment itself, and most environmental ethics is based on an ＂enlightened＂ anthropocentrism which values environmental protection for the sake of other humans including the future generations. Philosophically speaking, the concept of moral obligations towards generations, who have not been born yet, can be challenged. This vicious circle is a fundamental issue for ＂environmental ethics.＂ The current paper is an attempt to help correct this broken cycle of arguments using three lines of argument： （1） The harmful impact of human activity on the environment does not benefit all humans; the question is not over the selfishness and short-sightedness of humankind regarding the environment as much as it is regarding ＂environmental＂ justice among humans. The pursuit of self-interest and wealth by some humans, but not all, should not lead philosophers to ignore the insufficiencies of our economic and capitalist systems in the delineation of morally correct human-environment interaction. The right to a livable environment is a universal human right and morality has to support it. （2） The moral obligation of humankind toward the environment is similar to any situation where a party, such as a child, does not have the ability to protect itself or defend its rights; this is the principle of ＂due care.＂ Humans have the knowledge to understand the complexity of ecosystem interrelationships and the harm which industrial activity has caused. Therefore they have a moral obligation to exercise due care to prevent it from being harmed irreversibly. （3） The third argument is concerned with human morality and the spirituality of the environment. It can be argued that the natural instinct of the love of the environment, biophilia, is not a cause but a symptom of the grand spiritual value in the environment, even though this spiritual value may not be confined to humans, but be accrued to all life forms that have and/or show a genuine interest in the environment.

基于三维标定板的相机-激光雷达联合标定方法

相机内参及相机与激光雷达外参标定是两者融合感知的前提,为解决平面标定方法存在的过拟合问题,并提高相机与低线束激光雷达的外参标定精度,提出一种基于三维标定板的相机内参及相机/激光雷达外参的联合标定方法。首先通过三维标定板校准相机内参以解决内参标定过程中的过拟合问题;然后设计了一种基于线曲率的平面提取方法来提高单帧点云的平面提取精度;最后通过图像与激光点云中对应的平面特征计算两个传感器之间的外参。实验结果表明,所提方法相比平面标定方法能得到更精确相机内参,与velo2cam_calibration算法相比,外参标定的平均平移误差减少了39.4%,平均旋转误差减少了37.1%。

“数智”背景下高校图书馆特藏资源库的建设与利用

特藏资源的本质特征是稀缺性和独特性。高校图书馆特藏资源获取途径有四种:馆藏资源挖掘、院系资源收集、校友及社会捐赠和外购。其中,馆藏资源挖掘是基础,其他三种是补充。三者中,院系资源收集常被忽视,捐赠和外购则利用不充分。对特藏资源的利用,就是挖掘其内在与外赋的价值:内在价值是资源载体所携带的内容、数据、意义等价值,通过利用数字与智能技术,深入挖掘特藏内在价值;外赋价值是资源载体在其形成、使用、流转、保存、收藏过程中获得的历史的、人文的情感与精神价值,通过主题展览等方式,将其展示、传承下去。文章分别介绍了人大文库、浙大文库、北航航空航天史料展,论述了高校特藏资源库在建设与利用的过程中产生的问题与成果,以期为高校图书馆特藏资源的建设与利用提供借鉴。

内外特征一致性对齐的非等距三维模型对应关系计算

针对非等距三维模型对应关系计算准确率低且难以自动化的问题,提出一种基于局部流形调和基与内外积空间对齐的三维模型对应关系计算算法.首先利用局部流形调和基作为模型本征信息,并结合笛卡儿坐标等外部信息嵌入内外积空间,实现本征信息和外部信息对齐;其次将计算对齐的目标函数与一致性点偏移算法融合,提高结果的稳定性和准确性;最后利用基于交替方向乘子法的交替优化算法来求解目标函数,构建最终的对应关系结果.与已有算法的对比实验结果表明,所提算法在SMAL,SHERC’19,TOSCA和SHERC’16 Topology数据集上构建的对应关系测地误差最小,全局对应关系准确率最高,同时能够处理拓扑噪声和模型自身对称性影响对应关系计算的问题.

内外动机对青少年记忆的影响及其神经机制

动机是一切行为的核心,动机可分为外在和内在动机。青少年时期既是记忆的关键期,也是动机发展的特殊时期。然而,目前关于内外动机影响青少年记忆的研究才刚刚起步,尚不清楚外在和内在动机影响青少年记忆的规律和机制是否一致,也不清楚二者如何交互影响记忆。本研究将结合认知范式和脑成像技术,考察外在和内在动机如何分别影响以及交互影响青少年记忆。这将有助于更加全面、深刻理解内外动机影响青少年记忆的独特规律和机制,为科学提升青少年动机和记忆效果提供研究证据。

面向工程化的高压直流GIL绝缘子表面电荷主动消散与检测方法探讨

绝缘子表面电荷积聚是高压直流GIS/GIL需要重点关注的绝缘问题,近年来关于绝缘子表面电荷积聚机理、消散、检测等方面的研究工作取得了很大进步。论文对面向工程化的直流GIL绝缘子表面电荷主动消散和检测方法进行探讨;提出表面电荷本征积聚和外诱积聚的概念,为直流GIL在设计、运行、维护阶段减少电荷积累铺平了道路;对基于X射线辐照的绝缘子表面电荷GIS/GIL罐体外的主动消散方法进行讨论,提出基于嵌入式静电传感器的绝缘子表面电荷积聚严重程度的评估方法,为直流GIL工程化提供理论和技术支撑。

烘干温度和时间对灰枣品质特征的影响

为考察不同干燥条件下灰枣品质差异,筛选合适的制干温度、时间,为灰枣热风干燥提供基础理论数据和技术参考,研究以采后灰枣为试材,测定不同干燥温度(45℃、55℃、65℃、75℃)、不同干燥时间(4 h、6 h、8 h)下灰枣外观品质及内在品质等相关指标,并综合评价制干果实的品质。结果表明,(1)在45℃、55℃、65℃处理4~6 h下灰枣表皮颜色较亮、内部褐变不明显、感官评价得分较高、果实纵横径差异不大,而随着干燥温度升高和时间延长,灰枣果实的表皮颜色慢慢由明到暗,红色褪去,黄色变深及皱缩现象明显、内部褐变较严重。(2)在65℃、75℃持续处理6~8 h条件下,灰枣制干黄酮、总酚、可溶性糖、可滴定酸含量较高,但65℃/8 h、75℃/6 h、75℃/8 h处理下表皮颜色、内部褐变、感官评价、果形指数指标表现较差。(3)通过主成分分析综合得出采后灰枣最佳烘干温度和时间为45℃/4 h。

智能型自修复材料的研究进展

自修复材料由于能够像人类的皮肤一样损伤后自行愈合,恢复材料原有的结构和功能,从而延长材料的使用寿命、提高材料的使用安全性、降低材料的维护成本。自修复材料根据其愈合机理可分为本征型和外援型两大类。文中详细介绍了两类自修复材料的愈合机理,以及自修复材料在生物医药领域、柔性电子产品领域和皮革涂层领域的应用,并指出了目前存在的问题和今后的发展方向。