Method of fabricating artificial rock specimens based on extrusion free forming(EFF)3D printing

Three-dimensional(3D)printing technology has been widely used to create artificial rock samples in rock mechanics.While 3D printing can create complex fractures,the material still lacks sufficient similarity to natural rock.Extrusion free forming(EFF)is a 3D printing technique that uses clay as the printing material and cures the specimens through high-temperature sintering.In this study,we attempted to use the EFF technology to fabricate artificial rock specimens.The results show the physico-mechanical properties of the specimens are significantly affected by the sintering temperature,while the nozzle diameter and layer thickness also have a certain impact.The specimens are primarily composed of SiO_(2),with mineral compositions similar to that of natural rocks.The density,uniaxial compressive strength(UCS),elastic modulus,and tensile strength of the printed specimens fall in the range of 1.65–2.54 g/cm3,16.46–50.49 MPa,2.17–13.35 GPa,and 0.82–17.18 MPa,respectively.It is capable of simulating different types of rocks,especially mudstone,sandstone,limestone,and gneiss.However,the simulation of hard rocks with UCS exceeding 50 MPa still requires validation.

Active video games in fully immersive virtual reality elicit moderate-to-vigorous physical activity and improve cognitive performance in sedentary college students

Background:Active video games are a new method for increasing physical activity(PA).Fully immersive virtual reality(VR)is a hardware device on which an active video game can run.Active(video games in)VR(AVR),might increase immersion,game engagement,and moderate-to-vigorous PA(MVPA),thereby yielding greater exercise-related benefits,e.g.,cognitive performance.Methods:We examined the induction of MVPA via an AVR and a sedentary VR(SVR)as well as the effects of VR play on cognitive performance,which was monitored using 2 different methods.Each of 29 sedentary college students attended three 20-min laboratory sessions(AVR,SVR,or control)in a randomized order;during the control session,they sat quietly doing nothing.A fully immersive headset was used for the 2 video game sessions.We monitored and computed participants’PA using hip-wom accelerometers(wGT3 x-bt;ActiGraph,Pensacola,FL,USA)and a heart rate band(Polar H7;Polar,Kempele,Finland).After each session,the participants completed a mnemonic similarity test(MST)to measure recognition memory.They also filled out a motion sickness questionnaire and an abbreviated game experience questionnaire.Results:The AVR session induced a significantly greater heart rate and more time spent in MVPA than did either of the other 2 sessions regardless of the PA monitoring method.AVR elicited greater game experience questionnaire-assessed sensory and imaginative immersion,challenge,and positive affect than did SVR.The mnemonic similarity test recognition score was marginally higher post-AVR session than it was post-SVR session.Conclusion:AVR elicited MVPA without a significant increase in motion sickness and induced a better game experience and better borderline cognitive performance than did SVR.

A Comparison of Address Forms in American English and Chinese

As one of the most frequently used language forms in people's daily communication,the address form carries many different social semantic meanings. This paper aims to compare western and eastern cultures through a tentative study of address forms in American English and Chinese. By finding their similarities and differences it will explore the deep structures of each culture.

Influence of “Conception Forming” in Traditional Chinese Landscape Painting on Landscape Art

"Conception forming" in traditional Chinese landscape painting is created by artists to describe mental state, but not images, so it is also called "virtual environment". In the construction of Chinese gardens, participation of literati and artists successfully transformed the "virtual environment" of traditional Chinese landscape painting into "real environment". This paper explored the inf luence of "form and spirit" in "conception forming" of traditional Chinese landscape painting on landscape art from 4 perspectives, so as to figure out the relationship between "form and spirit" and "virtuality and reality", and that the most artistic part of the relationship between "form and spirit" is the natural transformation between "virtuality and reality".

The Substantive Reform of Court Trials: A Transformation of Logic in the Methods of Evidence Investigation——Summary of the Reform Pilot Project in Chengdu

In the pilot project of the substantive reform of court trials,“unexpected” judgments appeared constantly because the traditional documentary investigation mode has been replaced by an investigation mode under the principle of directness and verbalism. This change in the logic of factual judgments has caused a change in the methods of evidence examination. In traditional evidence examination, evidence obtained from investigations is supposed to be genuine and reliable. In the substantive reform of court trials, it is presumed that evidence obtained from investigations cannot be fully trusted and it is easier to ascertain the facts of the case by investigating using the principles of directness, verbalism and individualized judging methods for evidence examinations. In practice, there are three main factors affecting the genuineness of evidence: the cognitive rules of testifiers, the motivation of the subjects who provide evidence, and the methods used by investigators to obtain evidence. Based on any one of these three factors, it cannot be concluded that evidence obtained from investigations is superior to evidence presented in court. The substantive court investigation is more advantageous to establishing the facts of a case than the traditional court investigation. The essential characteristics of the substantive reform of court trials are pursuing reality in essence instead of in form, and using the files of the court trials instead of the files of the investigation to avoid the evidence obtained through investigations from playing a decisive role in the adjudication thus making criminal procedures trial-centered rather than investigation-centered.

The Skin Deformation of a 3D Virtual Human

This paper presents a skin deformation algorithm for creating 3D characters or virtual human models. The algorithm can be applied to rigid deformation, joint dependent localized deformation, skeleton driven deformation, cross contour deformation, and free-form deformation （FFD）. These deformations are computed and demonstrated with examples and the algorithm is applied to overcome the difficulties in mechanically simulating the motion of the human body by club-shape models. The techniques described in this article enables the reconstruction of dynamic human models that can be used in defining and representing the geometrical and kinematical characteristics of human motion.

一种图像morphing效果的客观度量方法

给出了评价图像morphing效果的新方法。该方法分两步:首先,计算中间帧之间的相似度,由这些相似度值生成一条曲线;然后,在图像计算机动画领域首次提出图像morphing真实感度的概念(IMRD)。它通过计算曲线与坐标轴、曲线插值点处的曲率和其它一些衡量标准得到。试验表明,IMRD是一有效的度量图像morphing效果的客观方法,也是一种强有力的计算机动画的自动分析工具。

基于Internet虚拟产品开发设计系统流程

传统的产品设计流程是逻辑的、串行的开发过程.在设计中的某一环节如果出现问题,可能会中断或直接殃及整个设计的正常进行.本文利用VPD(虚拟产品的开发设计)技术的并行协同设计,解决以往传统设计的不足;并提出虚拟产品开发设计(VPD)的概念和体系结构关键技术,通过虚拟产品开发设计流程的分析,充分证实VPD技术的先进性.

基于Train2Vec的消防培训数据分类

为提高消防培训效果,提出一种基于深度神经网络的对混合现实消防培训数据分类的模型。通过Train2Vec将受训人员在混合现实火灾场景中进行消防培训时所产生的过程数据、生理数据构建为多维培训向量;通过对生成的多维培训向量进行相似度求解,实现将受训人员进行分类的功能,即归为专业消防人员、应对火灾经验丰富人员、未经历过火灾心理素质良好人员和未经历过火灾心理素质较差人员中的某类,为其生成个性化的应对火灾建议和消防培训任务,达到提升培训效果的目的。实验结果表明,该Train2Vec模型预测的身份信息的准确率为92.00%,可以实现受训人员的正确分类,从而实现个性化消防培训。

HARMONIC MAPPINGS OF THE HEXAGASKET TO THE CIRCLE

Harmonic mappings from the hexagasket to the circle are described in terms of boundary values and topological data. Explicit formulas are also given for the energy of the mapping. We have generalized the results in [10].

Rotating Squeezed Vacua as Time Machines

Squeezed quantum vacua seems to violate the averaged null energy conditions (ANEC’s), because they have a negative energy density. When treated as a perfect fluid, rapidly rotating Casimir plates will create vorticity in the vacuum bounded by them. The geometry resulting from an arbitrarily extended Casimir plates along their axis of rotation is similar to van Stockum spacetime. We observe closed timelike curves (CTC’s) forming in the exterior of the system resulting from frame dragging. The exterior geometry of this system is similar to Kerr geometry, but because of violation of ANEC, the Cauchy horizon lies outside the system unlike Kerr blackholes, giving more emphasis on whether spacetime is multiply connected at the microscopic level.

The “3 Genomic Numbers” Discovery: How Our Genome Single-Stranded DNA Sequence Is “Self-Designed” as a Numerical Whole

This article proves the existence of a hyper-precise global numerical meta-architecture unifying, structuring, binding and controlling the billion triplet codons constituting the sequence of single-stranded DNA of the entire human genome. Beyond the evolution and erratic mutations like transposons within the genome, it’s as if the memory of a fossil genome with multiple symmetries persists. This recalls the “intermingling” of information characterizing the fractal universe of chaos theory. The result leads to a balanced and perfect tuning between the masses of the two strands of the huge DNA molecule that constitute our genome. We show here how codon populations forming the single-stranded DNA sequences can constitute a critical approach to the understanding of junk DNA function. Then, we suggest revisiting certain methods published in our 2009 book “Codex Biogenesis”. In fact, we demonstrate here how the universal genetic code table is a powerful analytical filter to characterize single-stranded DNA sequences constituting chromosomes and genomes. We can then show that any genomic DNA sequence is featured by three numbers, which characterize it and its 64 codon populations with correlations greater than 99%. The number “1” is common to all sequences, expressing the second law of Chargaff. The other 2 numbers are related to each specific DNA sequence case characterizing life species. For example, the entire human genome is characterized by three remarkable numbers 1, 2, and Phi = 1.618 the golden ratio. Associated with each of these three numbers, we can match three axes of symmetry, then “imagine” a kind of hyperspace formed by these codon populations. Then we revisit the value (3-Phi)/2 which is probably universal and common to both the scale of quarks and atomic levels, balancing and tuning the whole human genome codon population. Finally, we demonstrate a new kind of duality between “form and substance” overlapping the whole human genome: we will show that—simultaneously with the duality between genes and junk DNA—there is a second layer of embedded hidden structure overlapping all the DNA of the whole human genome, dividing it into a second type of duality information/redundancy involving golden ratio proportions.

名中医王国华从“虚、毒、瘀”辨治高危型人乳头瘤病毒感染经验

高危型人乳头瘤病毒(HR-HPV)持续感染可造成癌前病变、宫颈癌、宫颈上皮内瘤变等疾病,是目前妇科常见疾病之一。西医治疗HR-HPV感染效果有一定局限性。王国华教授临证发现HR-HPV感染多与“虚、毒、瘀”互结有关,认为虚实错杂是其病机本质。紧扣“虚”为HR-HPV感染之发病基础,“毒”为HR-HPV感染之致病关键,“瘀”为HR-HPV感染之病情转枢,认为“虚、瘀、毒”贯穿HR-HPV感染发病始终,自拟益气解毒化瘀汤加减以扶正祛邪,巧用经验对药,灵活加减,治疗同时注重形神同调,身心合治,疗效显著。

Emotional evaluation of architectural interior forms based on personality differences using virtual reality

Recent studies have shown that architectural interior forms could impact the affective state of inhabitants.However,the direct relation of specific forms with specific affective states is difficult to determine.In addition,no systematic categorization of architectural forms and their relation to emotional states exists.The investigation of the impact of architectural features on inhabitants'emotions is further complicated by the use of two-dimensional images of forms in laboratory investigations,which cannot perceive real-world architecture.Furthermore,the interior form consists of a combination of different forms rather than only pure forms,which was considered in previous studies.This study aimed to rill these gaps by evaluating interior forms on the basis of clustering different images of built living rooms throughout history as well as their impact on emotions.This study used pleasure,arousal,and dominance ratings with an emphasis on individual differences in personality.Virtual sample rooms were created based on formal clusters of architectural forms.Results showed a relationship between forms and emotional states for different personality traits.This work provided a novel approach on the influence of architecture on emotion by considering systematic form categorization and combinations,personality differences,and a virtual reality setup.

Similarity Analysis-based Component Standardization for Product Family Design

During the product family design, it is necessary to reduce the variety of components and share common components among many products. The major benefits are lessened design efforts and reduced costs. Therefore, this paper presents an approach to standardize components of a product family. Form feature modeling for components is discussed. Based on the similarity analysis, a step by step method to standardize the feature architectures of components is described. The algorithms for standardization are identified as well. A case for standardizing components of an auto-body family is used to demonstrate the validity of this approach.

产教融合共同体建设:形态演进、现实审视与路径优化

打造产教融合共同体是深化现代职业教育体系建设改革、推动产业结构调整升级、促进经济社会发展的重要途径。通过分析产教融合组织形态演进历程发现,产教融合共同体形态从初级阶段的项目合作式向着未来阶段的生态圈型共同体演进。针对产教融合共同体建设中的现实问题,需要在加强产教融合共同体建设的政策供给和财政支持、鼓励和引导产教融合共同体的组织变革、建立高效的信息交流平台和沟通协调机制、推进实体化运行和市场化运作等方面积极行动,促进产教融合共同体的健康发展,实现建设职教强国的战略目标。

两岸术语求同化异路径初探

语言文字的统一是促进和维护国家统一的标志。术语是各领域知识和信息传播的核心和灵魂。现有研究发现,两岸多个领域的术语差异高达30%以上。从语言学角度看,同实同形术语包含两岸共同的语言表述规律性,“同实异形”的差异术语存在共性规律和微观可协调性;从术语使用现状看,异形术语有两岸融合的情形。学界已建设了大量的术语对照资源,据此本研究提出两岸术语研究应以“求同化异”为理念。本着同中求规律、异中找共性的研究思路,文章以社科领域两岸对照术语为研究基础,以英语对照术语含system的一组术语为例,对两岸同实同形、同实异形术语进行了分类研究,归纳了两岸同实同形术语的共同表述规律,分析了同实异形术语的差异类型和共性特征,讨论了相应的协调策略,期待为之后的术语生成、翻译提供参照,从而服务于两岸统一大业。

建设中华民族现代文明的三重依据、使命耦合、进路落点

建设中华民族现代文明,是在马克思主义科学理论的旗帜引领、中华民族文明历史的演进积淀、中国特色社会主义的实践探索中酝酿而来的新的文化使命。它的出场,紧密关联着“两个结合”理念、“中国式现代化”愿景、“中华民族伟大复兴”使命以及“人类文明新形态”蓝图,是势之所趋、使命所向。新的历史起点,要从赓续中华文明“历史文脉”、构筑意识形态“精神家园”、谱写中华民族“文明华章”、承托全球“文明倡议”四大落点,推陈出新地实现中华文明的生命更新与现代转型,以建设中华民族现代文明。

数字时代百年大学优秀教育遗产多维价值的数字化赋能路径

百年大学因其历经上百年积累、扬弃和沉淀,拥有特色鲜明、不可替代的优秀教育遗产,包括物质类和非物质类两大类型。虽然不同类型教育遗产特征存在差异,但其具有共同价值体系,既存在普遍的历史、科学和艺术价值,又可形成特殊的市场、教育、精神和社会价值。在当前数字革命背景下,百年大学作为教育遗产的主要归属权主体,对其自身教育遗产多维价值的数字化保护、开发和应用还处于初级阶段,亟须结合新型数字技术以重构数字化赋能路径:从现实载体到数字资源形态,在时间维度实现本体价值的延续;从数字资源到数字文化资本,在空间维度实现衍生价值的扩展;创设教育遗产虚实融合空间,以探索本体价值和衍生价值的互动。

松嫩草甸草原植物群落物种组成和多样性对刈割和长期放牧的响应

为明晰不同利用方式对松嫩草甸草原不同植物群落物种组成和多样性的影响,本研究通过对松嫩平原西部地带性植被草甸草原在刈割和长期放牧利用下两种典型群落-羊草(Leymus chinensis)群落和野古草(Arundinella hirta)群落的调查与分析,探究了两种利用方式对群落植物物种组成、重要值、生活型、数量特征及多样性等指标的影响。结果表明:刈割和长期放牧下羊草群落物种数为18种和21种,禾本科植物占比最高,分别为33.3%和45.45%;野古草群落物种数分别为39种和32种,禾本科植物占比为23.1%和21.9%。长期放牧增加羊草群落地面芽植物和野古草群落一年生植物占比,降低野古草群落地面芽植物占比。两种利用方式下两个群落饲用价值类型均以优良牧草的种类最多,占比分别为58.76%(刈割羊草群落)、53.33%(长期放牧羊草群落)、46.56%(刈割野古草群落)和46.63%(长期放牧野古草群落)。长期放牧显著降低了两个植物群落的盖度、高度和生物量(P <0.05)。与刈割相比,长期放牧下植物群落的Shannon-Wiener多样性指数和Simpson多样性指数均呈增加趋势。长期放牧下羊草群落和野古草群落S?rensen相似性指数更高,两个群落植物物种相似度更高;而Cody指数在刈割利用下更高,两个群落物种组成在刈割利用下的变化幅度更大。刈割和放牧对松嫩草甸草原不同植物群落的组成和多样性能够产生不同程度的影响,合理适度的利用方式和保护措施将更有利于对草原资源的可持续利用。