Research on Online-Offline Hybrid Teaching Mode of College English in the Context of New Liberal Arts

English is an important course in colleges,and students’proficiency in the language can significantly affect their learning in multiple disciplines.At present,offline classroom teaching is still the primary mode of college English teaching,and online teaching has not been widely used.Under the background of new liberal arts,the teaching tasks and objectives of college English have changed,and it is imperative to carry out online-offline hybrid teaching mode.This paper analyzes the feasibility of the online-offline hybrid teaching mode of college English,summarizes its problems,and explores its implementation strategies in the context of the new liberal arts,to provide references for teachers.

A New Classification Method of Stress Modes in Hybrid Stress Finite Element

The paper presents a new method for classifying the stress modes in hybrid stress finite element in terms of natural stress modes in finite element and the rank analysis of matrix G in forming element It reveals the relation among the different assumed stress field, and gives the general method in forming stress field Comparing with the method of eigenvalue analysis, the new method is more efficient

Effect of irrigation modes on the senescence of hybrid rice after heading

The pot experiment was designed to investigate therelationship between the senescence of hybrid riceand the irrigation mode and conducted during1984-1985.There were 30 pots for each treatmentand each pot contained 17.5 kg soil.Hybrid riceShanyou 6 was sown on 10 Jun ahd transplanted

Enhanced near-field radiative heat transfer between core-shell nanoparticles through surface modes hybridization

Core-shell nanoparticles(CSNPs)are widely used in energy harvesting,conversion,and thermal management due to the excellent physical properties of different components.Because of the synergistic interaction between the core and the shell,the thermal radiative properties are expected to be further enhanced.In this work,we achieve near-field radiative heat transfer(NFRHT)enhancement between SiC@Drude CSNPs.Numerical results show that the total heat flux between NPs is 1.47 times and 9.98 times higher than homogeneous SiC and Drude NPs at the same radius when the core volume fraction is 0.76.Surface modes hybridization arising from the interfaces of the shell-core and shell-air contributes to the improved thermal radiation.The effect of shift frequency on the NFRHT between SiC@Drude CSNPs is studied,showing that the enhancement ratio of NFRHT between CSNPs can reach 4.34 at a shift frequency of 1×10^(14) rad/s,which is 38.34 times higher than the previous work.This study demonstrates that surface modes hybridization in CSNPs can significantly improve NFRHT and open a novel path for high-efficiency energy transport at the nanoscale.

A Single Mode Hybrid Ⅲ-Ⅴ/Silicon On-Chip Laser Based on Flip-Chip Bonding Technology for Optical Interconnection

A single mode hybrid Ⅲ-Ⅴ/silicon on-chip laser based on the flip-chip bonding technology for on-chip optical interconnection is demonstrated. A single mode Fabry-Perot laser structure with micro-structures on an InP ridge waveguide is designed and fabricated on an InP/AIGaInAs multiple quantum well epitaxial layer structure wafer by using i-line lithography. Then, a silicon waveguide platform including a laser mounting stage is designed and fabricated on a silicon-on-insulator substrate. The single mode laser is flip-chip bonded on the laser mounting stage. The lasing light is butt-coupling to the silicon waveguide. The laser power output from a silicon waveguide is 1.3roW, and the threshold is 37mA at room temperature and continuous wave operation.

Research on Online and Offline Hybrid Teaching Mode under the Concept of OBE ——A Case Study for Software Engineering

With the support of the Ministry of Education’s Industry-Academia Collaborative Education Project and the critical project of Shandong Province’s education and teaching reform,we explore student-centered education reform positively to learn outcome-driven,which have the characteristics of a solid foundation,intense practice,strict process,and innovation.Under the technical support of the“Internet+”smart education,our practice has formed an online and offline hybrid teaching mode based on the effective interaction of teaching total factor under the OBE concept.Based on Bloom’s Taxonomy and Outcomes-based Education(OBE),this model formulates the overall objectives of the curriculum and the detailed objectives of each teaching step,plans the online and offline teaching design as a whole,and implements the target teaching by classification.Based on Laurillard’s scientific model of designing teaching sessions,we continuously iterate over the teaching steps like teacher communication,teacher demonstration,peer communication,and peer demonstration following the agile education concept.In the meantime,comprehensive application of SPOC online platform,Mu classroom,smart classroom offline carrier,WeChat/QQ social software,and other technical means facilitates the design for student-student interaction,teacher-student interaction,student-student discussion,teacher-student discussion,and other scenarios,realizing the combination of online and offline environment,of study independently and in the group,of flipped classroom and seminars.

MOOC construction of major core course and reform of Hybrid Teaching Mode Taking "principle of embedded system" as an example

The development of MOOC directly promotes the reform of physical classroom teaching,and leads to the reform of teaching mode and teaching method in the direction of improving teachers’teaching quality and students’learning effect and innovation ability.In order to meet the needs of MOOC teaching reform,based on the MOOC built by ourselves and running on the MOOC platform,this paper puts forward the hybrid teaching mode reform of the core courses of an computer specialty,which combines online and offline in depth.Sort out the knowledge system of an embedded system,build MOOC and put it online on domestic well-known MOOC platform,compile supporting teaching materials,and form an organic combination of online and offline teaching resources;proposing a hybrid teaching mode of online and offline combination,which focuses on interactive classroom teaching reform.On the basis of organizing students to carry out online autonomous learning,online and offline entity classroom carries out interactive classroom teaching reform;Using intelligent teaching tools to promote students to use mobile phones to participate in classroom learning,improve the universality of interactive teaching,carry out flipped classroom teaching,and improve the depth of interactive teaching.Based on the independent construction of MOOC,the hybrid teaching is carried out,which improves the pertinence of online teaching organization.The information-based teaching and flipped classroom teaching in the physical classroom improve the students’ability to solve problems,and lay a solid foundation for the improvement of teaching quality and learning effect.

Exploration and Practice of Database System Course Based on KAPI Teaching Modality Under the Emerging Engineering Education

Nowadays,it is extremely urgent for the software engineering education to cultivate the knowledge and ability of database talents in the era of big data.To this end,this paper proposes a talent training teaching modality that integrates knowledge,ability,practice,and innovation(KAPI)for Database System Course.The teaching modality contains three parts:top-level design,course learning process,and course assurance and evaluation.The top-level design sorts out the core knowledge of the course and determines a mixed online and offline teaching platform.The course learning process emphasizes the correspondence transformation relationship between core knowledge points and ability enhancement,and the course is practiced in the form of experimental projects to finally enhance students’innovation consciousness and ability.The assurance and evaluation of the course are based on the outcome-based education(OBE)orientation,which realizes the objective evaluation of students’learning process and final performance.The teaching results of the course in the past 2 years show that the KAPI-based teaching modality has achieved better results.Meanwhile,students are satisfied with the evaluation of the modality.The teaching modality in this paper helps to stimulate students’initiatives,and improve their knowledge vision and practical ability,and thus helps to cultivate innovative and high-quality engineering talents required by the emerging engineering education.

Theoretical Analysis on Propagation of Electromagnetic Wave in Preformed Narrow Plasma Channel

In the plasma sheath a narrow plasma channel generated by ultraintense laser pulses is simplified as a special cylindrical and hollow plasma waveguide with the infinite thickness of the plasma cladding. The electromagnetic wave （EM） propagation properties of the plasma channel near the cutoff and far from the cutoff are considered. Theoretical analysis shows that TE0m and TM0m and hybrid modes emerge in the plasma channel, which is influenced by the normalized frequency parameter B and numerical aperture NA. The cutoffs of the various modes are approximated. Single-mode operation is possible without a high-frequency limitation in the channel.

The Integration of Distance Learning and Classroom Teaching

The COVID-19 has not only changed people’s life-style,but also has changed our teaching concepts and methods.It causes sudden transition from classroom teaching to virtual teaching and then hybrid teaching.This presents a special challenge to language instruction which requires mutual communication between instructor and students as well as communication among students.First,by tracing the history of distance learning,this paper introduces the developmental stages of distance education,and the communication technology conditions behind them.Second,the background and current situation of Chinese language distance education is introduced.Third,after discussing the advantages and disadvantages of distance learning,the complementary relationship between virtual and face-to-face Chinese instruction,the ideal teaching mode and corresponding teaching strategies are discussed.

Mode Ⅲ fracture analysis by Trefftz boundary element method

This paper presents a hybrid Trefftz （HT） boundary element method （BEM） by using two indirect techniques for mode III fracture problems. Two Trefftz complete functions of Laplace equation for normal elements and a special purpose Trefftz function for crack elements are proposed in deriving the Galerkin and the collocation techniques of HT BEM. Then two auxiliary functions are introduced to improve the accuracy of the displacement field near the crack tips, and stress intensity factor （SIF） is evaluated by local crack elements as well. Furthermore, numerical examples are given, including comparisons of the present results with the analytical solution and the other numerical methods, to demonstrate the efficiency for different boundary conditions and to illustrate the convergence influenced by several parameters. It shows that HT BEM by usingthe Galerkin and the collocation techniques is effective for mode III fracture problems.

New progress of the miniaturized microwave ion source at Peking University

The generation of plasma in a microwave ion source involves confining electrons using a static magnetic field and energizing them with an electromagnetic field that transmitted into the plasma chamber.However,according to electromagnetics theory,there is always a cut-off size in circular wave guides for a given frequency.For a 2.45 GHz microwave,this dimension is 72 mm,which should theoretically prevent transmission of the microwave into the discharge chamber and no plasma can be generated.Since 2006 Peking University(PKU)has successfully developed a series of permanent magnet 2.45 GHz microwave ion sources(PKU PMECRs)with a discharge chamber less than 50 mm,capable of delivering tens of mA beams for accelerators.To explain this anomalous phenomenon,a hybrid discharge heating(HDH)mode that combines surface wave plasma and electron cyclotron heating has been proposed.This HDH mode not only successfully explains PKU PMECRs,but also predicts that the optimized inner diameter of the plasma chamber is 24 mm,which is confirmed by experiments involving different liners in the miniaturized microwave ion source.