Implementing Parental Involvement in Infants' Rooms: Explore Infant Teachers' Perspectives and Practices

Liu, Yanhui,Sulaimani, Mona F. International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.7

Researchers had theorized that the earliest years' experiences were extremely critical to a child's future development (Jung, 2008; Liu et al., 2020), and parental involvement was a key character (Lamb et al., 2002; Liu, 2020). Though the critical role of parental involvement in education has been confirmed, less attention has been paid to its influence on infants' development. For the sake of infants' appropriate development, infant teachers always met barriers to finding, designing, and implementing age-appropriate activities. This case study aims at exploring the role of parental involvement in the development in infancy by surveying one director, four infant teachers, and six early childhood pre-service teachers' perspectives and practices regarding parental involvement in infant rooms within a Reggio Emilia-inspired child development center. Findings revealed that all participants: (1) thought parental involvement was essential to their decision-making process; (2) were aware of the benefits of implementing parental involvement in infants' rooms; (3) gained an opportunity to reflect on their practices regarding parental in-volvement and reprocess their previous perspectives. This study recommends that, in order to facilitate infants' development appropriately, child-care centers need to take into account parental involvement and work with parents collaboratively.

Viscosity evaluation of Fe–Ni–Co ternary alloy from the measured binary systems

Yanhui Liu,Xuewei Lv,Chenguang Bai,Pingsheng Lai,JinSheng Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-

The iso-viscosity curves of liquid Fe–Ni–Co ternary alloys at 1600 8C were investigated with consideringthe excess viscosity of ternary alloy by the means of three models (Kohler, Toop and Chou) from themeasured sub-binary data in this work. Excess viscosities were used instead of excess thermodynamicproperties in geometrical models, and the excess viscosities of the sub-binary systems were fit by usingthe 3rd degree (n = 3) Redlich–Kister polynomial. The increase of Ni content results in the decrease of theviscosity of the ternary alloy, while Fe has opposite effect. When the molar content of Ni within the alloydoes not exceed 50%, the increase of Co lowers the viscosity. Once its content is above 50%, Co canpromote the increase of the viscosity of the ternary alloy. Similarity coefficients of the Fe–Ni, Fe–Co andNi–Co three binary systems mentioned in the Chou model have been calculated and their values are 0.82,0.20 and 0.47, respectively, showing that the Fe–Ni–Co ternary system is not exactly the ‘‘Kohler model’’or ‘‘Toop model’’, so both Kohler model and Toop model cannot obtain the accurate predicted values. Thepredicted iso-viscosity curves calculated by the Chou model should be recommended. Some activationenergies of the ternary alloy were calculated by the three models and compared with three sub-binarysystems, and the evaluated activation energies calculated by the Chou model should be recommended. Except the sample AE3 and AE6, other activation energy values predicted by three different models aresimilar by a narrow margin. The activation energies for AE3 and AE6 are the lowest and highest,respectively, because of the mix effect of the ternary alloy.

Electrochemical codeposition of graphene/polypyrrole composites on carbon paper for electrochemical capacitors

Yanhui Liu,Ke Xu,Xiaochen Zhang,Chunhua Qi,Qingchun Lv,Houjun Feng 한국물리학회 2016 Current Applied Physics Vol.16 No.5

A simple electrochemical codeposition technique has been introduced to fabricate graphene oxide/ polypyrrole (GO/PPy) composites. To increase the adsorption of colloidal GOs at the liquideliquid interface, the organic supporting electrolyte like benzenesulfonate sodium (BS) is added in GO/pyrrole micelle solution, which does not induce the flocculation sedimentation of GO at elevated ionic strength. The narrow size distribution of GO/pyrrole/BS micelles is benefit for uniform codeposition of GO/PPy on the carbon fiber surface. Moreover, the GO nanosheets and benzensulfonate have been incorporated into composites as mixture dopants, which increased the growth orientation of PPy in electropolymerization process and result in more loose structure for ionic transportation. The composites electrodes exhibit high specific capacitance, good cyclic stability after electrochemical reduction of graphene oxide (RGO). The specific capacitance of composite electrode with low mass density still reaches 358 F/g at scan rate of 10 mV/s within an electrochemical windows of 1.0 V. The strong interaction effect between two components resists the mechanical deformation effect and exhibits only 7.1% decay at a charge/discharge current of 3 A/g after 1000 cycles. At increasing the mass density of composites to 8.4 mg/cm2, the areal capacitance of electrode almost grow linearly to 1.286 F/cm2, which is more than triple that of BS-doped PPy with the same mass density. The high capacity of the composite electrode exerts the potential applications in capacitive deionization, microbial fuel cell or even capacitive energy storage.

Design and application of a novel eddy current damper for a high-rise sightseeing tower

Kaifang Liu,Yanhui Liu,Chia-Ming Chang,Ping Tan 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.4

A conventional tuned mass damper (TMD) provides a passive control option to suppress the structures’ wind- or earthquake-induced vibrations. However, excessive displacements of the TMD raise concerns in the practical implementation. Therefore, this study proposes a novel TMD designed for and deployed on a high-rise sightseeing tower. The device consists of an integrated two-way slide rail mount and an eddy current damper (ECD) with a stroke control mechanism. This stroke control mechanism allows the damping coefficient to automatically increase when the stroke reaches a predetermined value, preventing excessive damper displacements during large earthquakes. The corresponding two-stage damping parameters are designed with a variable-thickness copper plate to enable the TMD stroke within a specified range. Thus, this study discusses the detailed design schemes of the device components in TMD. The designed two-stage damping parameters are also numerically verified, and the structural responses with/without the TMD are compared. As seen in the results, the proposed TMD yields effective control authority to limit the acceleration response within a comfort level. In addition, this TMD resolves the spatial availability for the damper movement in high-rise buildings by the controllable damping mechanism.

Repair Decision Based on Sensitivity Analysis for Aero-Engine Assembly

Yanhui Sun,Junkang Guo,Jun Hong,Guanghui Liu,Wenwu Wu,Cong Yue 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.3

Strict requirements for concentricity of the multistage high pressure rotor of an aero-engine are employed to guarantee performances such as vibration. Tedious and time-wasting trial assembly by adjusting the installation angles of stages is needed to meet the requirements due to the lack of effective analysis methods. Furthermore, there is no quick way to find out where the problem is and how to repair the parts when the installation-angle-adjusting method fails. This article focuses on a solution to optimize the installation angle of each stage and to make repair decisions in the assembly process. The run-out data are processed by least square method to get the spatial positions and attitudes of flanges and a deviation propagation analysis model is built by virtue of homogeneous coordinate transformation theory to predict the accumulative errors of each stage. The eccentricities of stages are evaluated with reference to the common axis and the installation angles of stages are optimized by minimizing the sum of eccentricities. Sensitivities of eccentricity, eccentric angle and parallelism of each stage are analyzed and repair decisions for parts are made to meet more strict requirements. An example of a three-stage subassembly is presented to demonstrate the solution.

Enhanced Ultra‑violet Photodetection Based on a Heterojunction Consisted of ZnO Nanowires and Single‑Layer Graphene on Silicon Substrate

Yu Liu,Zengcai Song,Sheng Yuan,Lei Xu,Yanhui Xin,Meixia Duan,Shuxia Yao,Yangrui Yang,Zhenwei Xia 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.1

In this study, heterojunction photoelectric devices based ZnO nanowires were fabricated on p-Si substrate with and without single-layer graphene as insert layer. ZnO nanowires and graphene were prepared by hydrothermal method and chemical vapor deposition respectively. The efect of insert layer on the morphology of ZnO nanowires was very weak as can be seen from scanning electron microscope and X-ray difraction. Raman scattering showed that the graphene prepared was a singlelayer structure. The ultraviolet detection performance of photodetectors with single graphene insert layer was much better than that of photodetectors without single graphene insert layer. The ultraviolet irradiation sensitivity of photodetectors with single graphene insert layer was up to 1071 which was improved 7 times than that of photodetectors without single graphene insert layer. Moreover, photodetectors with single graphene insert layer had faster response time (1.02 s) and recovery time (0.34 s).

Combinatorial development of bulk metallic glasses

Ding, Shiyan,Liu, Yanhui,Li, Yanglin,Liu, Ze,Sohn, Sungwoo,Walker, Fred J.,Schroers, Jan Nature Publishing Group, a division of Macmillan P 2014 NATURE MATERIALS Vol.13 No.5

The identification of multicomponent alloys out of a vast compositional space is a daunting task, especially for bulk metallic glasses composed of three or more elements. Despite an increasing theoretical understanding of glass formation, bulk metallic glasses are predominantly developed through a sequential and time-consuming trial-and-error approach. Even for binary systems, accurate quantum mechanical approaches are still many orders of magnitude away from being able to simulate the relatively slow kinetics of glass formation. Here, we present a high-throughput strategy where ∼3,000 alloy compositions are fabricated simultaneously and characterized for thermoplastic formability through parallel blow forming. Using this approach, we identified the composition with the highest thermoplastic formability in the glass-forming system Mg–Cu–Y. The method provides a versatile toolbox for unveiling complex correlations of material properties and glass formation, and should facilitate a drastic increase in the discovery rate of metallic glasses.

Generalized complex mode superposition approach for non-classically damped systems

Huating Chen,Yanhui Liu,Ping Tan 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.73 No.3

Passive control technologies are commonly used in several areas to suppress structural vibrations by the addition of supplementary damping, and some modal damping may be heavy beyond critical damping even for regular structures with energy dissipation devices. The design of passive control structures is typically based on (complex) mode superposition approaches. However, the conventional mode superposition approach is predominantly applied to cases of under-critical damping. Moreover, when any modal damping ratio is equal or close to 1.0, the system becomes defective, i.e., a complete set of eigenvectors cannot be obtained such that some well-known algorithms for the quadratic eigenvalue problem are invalid. In this paper, a generalized complex mode superposition method that is suitable for under-critical, critical and over-critical damping is proposed and expressed in a unified form for structural displacement, velocity and acceleration responses. In the new method, the conventional algorithm for the eigenvalue problem is still valid, even though the system becomes defective due to critical modal damping. Based on the modal truncation error analysis, modal corrected methods for displacement and acceleration responses are developed to approximately consider the contribution of the truncated higher modes. Finally, the implementation of the proposed methods is presented through two numerical examples, and the effectiveness is investigated. The results also show that over-critically damped modes have a significant impact on structural responses. This study is a development of the original complex mode superposition method and can be applied well to dynamic analyses of non-classically damped systems.

Tensile Properties and Corrosion Behavior of a Dilute Mg–0.5Sn–0.7Al–0.8Zn Alloy Applied for Biomaterials

Weili Cheng,Yanhui Liu,Yao Zhang,Shuaiju Meng,Srinivasan Arthanari,Hong‑xia Wang,Lifei Wang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11

A novel dilute Mg–0.5Sn–0.7Al–0.8Zn alloy was developed and directly extruded after casting process. The extrudedalloy consisted of fine bimodal grained microstructure, local nano-precipitates micro-region and typical extrusion direction(ED)-tilted texture. A great balance between tensile properties (YS = 262.7 MPa, EL = 26.0%) and corrosion resistance(Pi = 1.57 mm/a) was achieved and discussed in terms of grain size, structure, orientation as well as precipitates and/or corrosionproduct film. As a result, this dilute alloy system shows the great potential to be developed as a biomaterial.

Bridge-edges Mining in Complex Power Optical Cable Network based on Minimum Connected Chain Attenuation Topological Potential

( Wanchang Jiang ),( Yanhui Liu ),( Shengda Wang ),( Jian Guo ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.3

The edges with “bridge characteristic” play the role of connecting the communication between regions in power optical cable network. To solve the problem of mining edges with “bridge characteristic” in provincial power optical cable network, the complex power optical cable network model is constructed. Firstly, to measure the generated potential energy of all nodes in n-level neighborhood local structure for one edge, the n-level neighborhood local structure topological potential is designed. And the minimum connected chain attenuation is designed to measure the attenuation degree caused by substituted edges. On the basis of that, the minimum connected chain attenuation topological potential based measurement is designed. By using the designed measurement, a bridge-edges mining algorithm is proposed to mine edges with “bridge characteristic”. The experiments are conducted on the physical topology of the power optical cable network in Jilin Province. Compared with that of other three typical methods, the network efficiency and connectivity of the proposed method are decreased by 3.58% and 28.79% on average respectively. And the proposed method can not only mine optical cable connection with typical “bridge characteristic” but also can mine optical cables without obvious characteristics of city or voltage, but it have “bridge characteristic” in the topology structure.