Case Study: CUP between L1 and L2

This case study project explores the English language learning process of a student named Abby*(name changed for confidentiality),an adult beginning learner studied at Abram Friedman Occupational Center(AFOC).[1]The paper focuses on analyzing under the theoretical concept of Common Underlying Proficiency model(CUP),especially the language transfer with the data collected from ten weeks of observation,interview with the case study student and her teacher,the chat with her classmates,and the samples of the student’s work.Data is acquired from the community,school,and classroom,to include all related factor that may influence and reflect the relationship between the student’s first language(L1)-Spanish and her second language(L2)-English.The paper intends to analyze the L1 of the case study student plays a positive role during the process of learning English via three sub-claims.Finally,the paper provides recommendations to support the student to use her L1 to promote English learning comprehensively and end with reflections on the case study process.

Intrinsically Stretchable Electroluminescent Materials and Devices

Intrinsically stretchable electroluminescent(EL)devices have emerged as pivotal components with transformative potential in various domains,including wearable technology,medical devices,human-machine interfaces,and communications.This mini-review focuses on the recent progress in the development of intrinsically stretchable EL materials,highlighting milestones and breakthroughs in the field.The article discusses the basic principles,advantages,and disadvantages associated with various EL mechanisms and materials.Specific material design strategies,particularly focusing on light-emitting layers,are thoroughly examined,detailing their implementation in EL devices and the resultant EL performance.We also provide perspectives on the active challenges and future research needs for each type of EL material and devices for achieving stretchable designs,together with some insights into the future trajectory of stretchable EL technology.

Dipole-moment-induced effect on contact electrification for triboelectric nanogenerators

Triboelectric nanogenerators （TENGs） have been demonstrated as an effective way to harvest mechanical energy to drive small electronics. The density of triboelectric charges generated on contact surfaces between two distinct materials is a critical factor for dictating the output power. We demonstrate an approach to effectively tune the triboelectric properties of materials by taking advantage of the dipole moment in polarized polyvinylidene fluoride （PVDF）, leading to substantial enhancement of the output power density of the TENG. The output voltage ranged from 72 V to 215 V under a constant contact force of 50 N. This work not only provides a new method of enhancing output power of TENGs, but also offers an insight into charge transfer in contact electrification by investigating dipole-moment-induced effects on the electrical output of TENGs.