The Flipping-Free Full-Parallax Tabletop Integral Imaging with Enhanced Viewing Angle Based on Space-Multiplexed Voxel Screen and Compound Lens Array

Tabletop integral imaging display with a more realistic and immersive experience has always been a hot spot in three-dimensional imaging technology,widely used in biomedical imaging and visualization to enhance medical diagnosis.However,the traditional structural characteristics of integral imaging display inevitably introduce the flipping effect outside the effective viewing angle.Here,a full-parallax tabletop integral imaging display without the flipping effect based on space-multiplexed voxel screen and compound lens array is demonstrated,and two holographic functional screens with different parameters are optically designed and fabricated.To eliminate the flipping effect in the reconstruction process,the space-multiplexed voxel screen consisting of a projector array and the holographic functional screen is presented to constrain light beams passing through the corresponding lens.To greatly promote imaging quality within the viewing area,the aspherical structure of the compound lens is optimized to balance the aberrations.It cooperates with the holographic functional screen to modulate the light field spatial distribution.Compared with the simulation results,the distortion rate of the imaging display is reduced to less than 9%from more than 30%.In the experiment,the floating high-quality reconstructed three-dimensional image without the flipping effect can be observed with the correct 3D perception at 96°×96°viewing angle,where 44,100 viewpoints are employed.

Transmutation Scheme of Coin Flipping Protocol and Utilization

Coin flipping by telephone protocol（CFP） is utilized in a system to exchange a binary sequence at random between two person apart far from each other. However, CFP cannot he used in a system with many users like in a group environment system. A transmutation of CFP named T-CFP is proposed in this paper. The precondition of T-CFP is the system＇s user trusts the system center and center＇s cheating is meaningless at the same time. The significant difference between CFP and T-CFP is that CFP supports only two users while T-CFP can support many users to exchange special information. The security and efficiency of T-CFP are discussed with a detailed example on T-CFP utilization is demonstrated in this paper.

The Exploration on the Effectiveness of English Grammar Teaching Based on Flipping Classroom for English Majors in Colleges

At present grammar teaching is one of the most difficult points because of the limited teaching time and emphasizing on terminology memory and rules of understanding, therefore, students think learning grammar is boring and ineffective. For the reason, the effectiveness of college English grammar teaching based on flipping classroom is analyzed.

具有猎物避难所和HollingⅡ型功能反应函数的离散捕食者-食饵模型的分岔分析

考虑一类具有猎物避难所和HollingⅡ型功能反应函数的离散模型.选取参数,利用中心流形定理和分岔理论,阐述模型在正平衡点处存在Flip分岔和Neimark-Sacker分岔,展示模型的动力学行为.最后进行数值模拟验证理论结果的有效性.

A novel conformationally adaptive macrocyclic tetramaleimide with flipping pyrene sidewalls

The synthesis,structure,and properties of pyrene-based conformationally adaptive macrocycles are described.This new type of conformationally adaptive macrocycle was constructed through Perkin reaction,followed by imidization.By changing the condensation partner as the linking unit,a family of conjugated macrocycles with different sizes of the cavity was synthesized,which provide a simple and modular synthetic strategy towards the conformationally adaptive macrocycles.Furthermore,the macrocycles provide two well-defined conformations through flipping pyrene subunit,which were unambiguously determined by single-crystal X-ray diffraction analysis.The conformational interconversion barrier was determined by density functional theory(DFT)calculations.This new macrocycle also demonstrated unique properties,such as vapochromic behavior and aggregation emission enhancement effect.Furthermore,we have also investigated the effect of the linker on the shape and photophysical properties of the resulting macrocyclic products.

Achieving a high magnetization in sub-nanostructured magnetite films by spin-flipping of tetrahedral Fe3. cations

Magnetite Fe304 （ferrite） has attracted considerable interest for its exceptional physical properties： It is predicted to be a semimetallic ferromagnetic with a high Curie temperature, it displays a metal-insulator transition, and has potential oxide-electronics applications. Here, we fabricate a high-magnetization （〉 1 Tesla） high-resistance （-0.1 Ωcm） sub-nanostructured （grain size 〈 3 nm） Fe304 film via grain-size control and nano-engineering. We report a new phenomenon of spin- flipping of the valence-spin tetrahedral FeB＊ in the sub-nanostructured Fe304 film, which produces the high magnetization. Using soft X-ray magnetic circular dichroism and soft X-ray absorption, both at the Fe L3,2- and O K-edges, and supported by first-principles and charge-transfer multiple calculations, we observe an anomalous enhancement of double exchange, accompanied by a suppression of the superexchange interactions because of the spin-flipping mechanism via oxygen at the grain boundaries. Our result may open avenues for developing spin- manipulated giant magnetic Fe304-based compounds via nano-grain size control.

Examining Electrostatic Influences on Base-Flipping:A Comparison of TIP3P and GB Solvent Models

Recently,it was demonstrated that implicit solvent models were capable of generating stable B-form DNA structures.Specifically,generalized Born(GB)implicit solvent models have improved regarding the solvation of conformational sampling of DNA[1,2].Here,we examine the performance of the GBSW and GBMV models in CHARMM for characterizing base flipping free energy profiles of undamaged and damaged DNA bases.Umbrella sampling of the base flipping process was performed for the bases cytosine,uracil and xanthine.The umbrella sampling simulations were carried-out with both explicit(TIP3P)and implicit(GB)solvent in order to establish the impact of the solvent model on base flipping.Overall,base flipping potential of mean force(PMF)profiles generated with GB solvent resulted in a greater free energy difference of flipping than profiles generated with TIP3P.One of the significant differences between implicit and explicit solvent models is the approximation of solute-solvent interactions in implicit solvent models.We calculated electrostatic interaction energies between explicit water molecules and the base targeted for flipping.These interaction energies were calculated over the base flipping reaction coordinate to illustrate the stabilizing effect of the explicit water molecules on the flipped-out state.It is known that nucleic base pair hydrogen bonds also influenced the free energy of flipping since these favorable interactions must be broken in order for a base to flip-out of the helix.The Watson-Crick base pair hydrogen bond fractions were calculated over the umbrella sampling simulation windows in order to determine the effect of base pair interactions on the base flipping free energy.It is shown that interaction energies between the flipping base and explicit water molecules are responsible for the lower base flipping free energy difference in the explicit solvent PMF profiles.

曝小米15 Pro搭载骁龙8 Gen4:正在测试卫星通信

继华为Mate 50系列首发卫星通信技术后,荣耀Magic6系列、OPPO Find X7系列等旗舰相继支持卫星通信。接下来要发布的小米14 Ultra、小米MIX Flip折叠屏等新品也将支持卫星通信,手机行业即将在旗舰产品线上全面普及卫星通信方案。博主数码闲聊站今天发微博暗示,小米15 Pro也在测试卫星通信技术,此前数码闲聊站透露,小米14 Pro曾经测试过卫星通信,但是因成本问题最后拿掉了这个功能,卫星通信将会出现在小米14 Ultra上。

Research and Discussion on Flipped Classroom Combined with Case-Based Learning in Pharmacoeconomics Teaching

Objective:To explore the application effect of flipped classroom combined with case-based learning teaching methods in pharmacoeconomics teaching.Methods:The students majoring in clinical pharmacy in 2019 were selected as the study subjects,and the cost-effectiveness analysis of different dosage forms of Yinzhihuang in the treatment of neonatal jaundice was selected as the teaching case.The flipped classroom combined with case-based learning teaching method was used to carry out theoretical teaching to the students.After the course,questionnaires were distributed through the Sojump platform to evaluate the teaching effect.Results:The results of the questionnaire showed that 85.71%of the students believed that the flipped classroom combined with case-based learning teaching method was helpful in mobilizing the learning enthusiasm and initiative,and improving the comprehensive application ability of the knowledge of pharmacoeconomics.92.86%of the students think that it is conducive to the understanding and memorization of learning content,as well as the cultivation of teamwork,communication,etc.Conclusion:Flipped classroom combined with case-based learning teaching method can improve students’knowledge mastery,thinking skills,and practical application skills,as well as optimize and improve teachers’teaching levels.

Analysis of the Application Value of Virtual Reality Combined with Flipped Classroom Teaching Mode in Cardiopulmonary Resuscitation Teaching

Objective:To analyze the value of using virtual reality combined with the flipped classroom teaching model in teaching cardiopulmonary resuscitation(CPR).Methods:Two classes of our nursing program were randomly selected for the study from September 2022 to September 2023,Class A(52 students,conventional teaching method)and Class B(52 students,virtual reality combined with flipped classroom teaching mode).The assessment scores and independent learning ability scores of the students in the two classes were compared.Results:CPR theory and operation scores,passing rate,and independent learning ability scores of Class B were higher than those of Class A(P<0.05).Conclusion:the use of virtual reality combined with the flipped classroom teaching mode in CPR teaching is conducive to the improvement of students’assessment scores and independent learning ability.

Flip Chip技术在集成电路封装中的应用

阐述从集成电路封装发展现状、Flip Chip技术内涵、Flip Chip技术在集成电路封装中的应用剖析、市场发展展望等多个角度,探讨在集成电路封装中,应用Flip Chip技术的必要性和重要性。

Thermodynamic Insights of Base Flipping in TNA Duplex: Force Fields, Salt Concentrations, and Free-Energy Simulation Methods

Threofuranosyl nucleic acid(TNA)is an analogue of DNA with a shift in the internucleotide linkages from the wild-type 5’-to-3’direction to 3’-to-2.’This alteration leads to higher chemical stability,less reactive groups,and lower conformational flexibility.Experimental observations indicate that these characteristic changes are attributable to a minimal perturbation of the interaction network,but the thermodynamic stability of the duplex remains unaltered in the TNA mutation.We applied the equilibrium and nonequilibrium free-energy simulations employing three popular assisted model building with energy refinement(AMBER)force fields for nucleotides to investigate this mutation-dependent behavior in the base flipping from T(DNA)residue to the T-to-TFT mutation(TNA)computationally.The force fields were performed similarly,as described in the base-paired state.However,after exploring the high-energy regions with free-energy simulations,we observed that these three force fields behaved differently.Previous reports conclude that the net-neutral and excess-salt simulations provided similar results.Nonetheless,our free-energy simulation indicated that the presence of excess salt affected the thermodynamic stability.The free-energy barrier along the base-flipping pathway was generally elevated upon the addition of excess salts,but the relative height of the free-energy barriers in DNA and TNA duplexes did not change significantly.This phenomenon emphasizes the importance of adding sufficient salts in the simulation scheme to reproduce the experimental condition.

FLIPPING THE SCRIPT

A former factory worker and car mechanic from Hong Kong,world-renowned artist Fung Ming Chip(冯明秋)is credited with creating over 100 new Chinese calligraphic scripts.Fresh off his solo exhibition in New York City’s QM Fine Art gallery,the experimental calligrapher sits down with TWOC to discuss his unusual career trajectory and how it inspires his art.

一类离散不可逆平面映射的分支

本文主要研究的是一类离散的不可逆平面映射,当参数变化时,该映射动态的变化情况。首先,对不可逆平面映射的不动点的存在性及稳定性进行了分析,得到不可逆平面映射有两个不动点,通过对参数a,b进行分析,分别得出两个不动点稳定性的条件;其次,通过对参数b进行控制,从而导出flip分支、transcritical分支及Hopf分支存在的充分条件;最后通过数值模拟,验证了这些分支存在条件的理论结果。

Flipped classroom approach to global outreach:cross-cultural teaching of horizontal strabismus to Chinese ophthalmology residents

AIM:To evaluate the flipped classroom model for teaching horizontal strabismus didactics in an ophthalmology residency program in China as part of a visiting professorship from the United States.METHODS:Residents from an ophthalmology residency program in China were invited to participate in flipped classroom sessions taught by an experienced American ophthalmology faculty in 2018.Residents were instructed to watch a pre-class video lecture prior to the in-class-casebased activity.Content tests(5 Ophthalmic Knowledge Assessment Program style questions)and surveys were administered before and after the classroom sessions(100%response rate).These results were compared to that of an American cohort who were taught the same content.RESULTS:The Chinese cohort of 12 residents preferred the flipped classroom to the traditional classroom at higher rates than the American cohort of 40 residents(92%vs 55%,P=0.04)and felt that all ophthalmology topics would be appropriate for the flipped classroom teaching style(P-values between 0.008 and<0.001).In both Chinese and American cohorts,we found that the exotropia curriculum saw a small but significant improvement in performance following the flipped classroom session(P=0.025 for Chinese residents;P=0.001 for US residents),whereas scores in both groups for the esotropia course did not significantly improve.CONCLUSION:This is the first study to evaluate the flipped classroom model implemented by a visiting ophthalmology professor in a global outreach setting.The flipped classroom sessions are viewed favorably by the Chinese residents relative to the US cohort with a modest impact on knowledge.Decreased in-person interpreter requirement and increased student engagement make this model valuable in cross-cultural visiting professorship settings.Finally,the flipped classroom may lend itself well to a virtual format to prevent the transmission of COVID-19,although such a format requires further study.

一类具有恐惧效应的离散捕食系统的稳定性分析

为了研究恐惧效应和捕食者之间的合作狩猎对捕食系统的影响,建立了一类具有恐惧效应和合作狩猎的离散捕食者-食饵模型。利用笛卡尔符号法则讨论了系统平衡点的存在性,分析了平衡点的稳定性;运用中心流形定理和分岔理论分析了Flip和Neimark-Sacker分岔的存在性条件。数值模拟验证了理论结果的有效性,并且表明系统会呈现双稳状态。

仅食饵染病的离散捕食系统的分支分析

研究了食饵具有双线性疾病发生率的染病捕食者-食饵离散系统的分支分析与混沌控制。通过前向欧拉法对系统离散化,获得了离散系统平衡点的存在性和正平衡点的稳定性条件。应用n维离散系统发生分支的显式判据,得到了系统正平衡点处Neimark-Sacker分支和Flip分支产生的条件。采用状态反馈和参数扰动的混合控制策略来控制分支和混沌行为。利用数值模拟验证支持了理论结果和控制策略的有效性。

具有弱Allee效应的离散染病捕食系统的分支分析

建立了食饵具有双线性疾病发生率、捕食者具有寻求配偶的弱Allee效应的食饵捕食者模型,使用前向欧拉法对系统离散化,并进行了分支分析。首先,通过平衡态分析,获得了离散系统平衡点的存在性,并得到了正平衡点稳定性的充分必要条件;然后,应用n维离散系统发生分支的显式判据,证明了系统正平衡点处发生Neimark-Sacker分支和Flip分支;最后,利用数值模拟验证支持了理论结果。结果表明,Allee效应能够恢复系统的稳定。

Flip Chip结构的IC信号完整性仿真分析

针对Flip Chip封装型芯片设计过程中存在的传输线阻抗不连续与串扰过大等问题,从层叠设置与板材介质厚度两个角度提出了一种基于阻抗、串扰的仿真分析设计方法,主要涉及两个方面:对于由信号参考平面被分割而造成的阻抗突变问题,通过添加参考平面而使信号具有完整的回流路径,使得传输线的阻抗在平面分割处由167.5Ω降至52.5Ω;对于因布线密度过大而造成的走线之间的串扰系数偏高的问题,通过减小板材的介质厚度使传输线间串扰系数的最大值从17.26%降至14.01%。仿真结果表明,此设计方法有效降低了芯片设计中潜在的信号完整性风险,提高了芯片的可靠性和稳定性。

The impact of ChatGPT on foreign language teaching and learning:Opportunities in education and research

The revolutionary online application ChatGPT has brought immense concerns to the education field.Foreign language teachers being some of those most reliant on writing assessments were among the most anxious,exacerbated by the extensive media coverage about the much-fantasized functionality of the chatbot.Hence,the article starts by elucidating the mechanisms,functions and common misconceptions about ChatGPT.Issues and risks associated with its usage are discussed,followed by an in-depth discussion of how the chatbot can be harnessed by learners and teachers.It is argued that ChatGPT offers major opportunities for teachers and education institutes to improve second/foreign language teaching and assessments,which similarly provided researchers with an array of research opportunities,especially towards a more personalized learning experience.