How High School Mathematics Teachers Use New Textbook : A Case Study from China

( Zhuo Li ),( Jiansheng Bao ) 한국수학교육학회 2023 수학교육연구 Vol.26 No.4

In this paper, we propose a theoretical framework for Chinese high school mathematics teachers use new textbooks based on the work of Remillard (1999) and Chau (2014). Based on this framework, a multiple case approach was used to investigate how two high school mathematics teachers from Shanghai use new textbooks. The results suggest that in the curriculum mapping arena, both the novice teacher and the expert teacher often planned to appropriate the unit content, and sometimes planned to add supplemental content. When organizing the unit content, novice teacher always planned to follow the new textbook in sequence, while expert teacher often would follow the new textbook in sequence, but sometimes planned to rearrange the unit content. In the design arena, both the novice teacher and the expert teacher tended to appropriate the introduced tasks and definitions. The novice teacher often planned to appropriate the example problems and exercise problems, while the expert teacher often intended to flexibly use the example problems and exercise problems. In the construction arena, the novice teacher seldom adjusted the planned tasks; in contrast, the expert teacher adjusted the planned tasks more frequently. In the reflection arena, the novice teacher often thought she should improve the mathematics tasks, while the expert teacher almost always thought he needed to improve the mathematics tasks. The framework shown in this paper provides a tool to investigate how mathematics teachers use textbooks.

Examining the Day-of-the-Week Effects in Chinese Stock Markets: New Evidence from a Stochastic Dominance Approach

ZHUO QIAO,WEIWEI QIAO,Wing-Keung Wong 연세대학교 동서문제연구원 2011 Global economic review Vol.40 No.3

Many researchers have investigated the existence of day-of-the-week effects in different financial markets. However, they have usually adopted a parametric approach, which is known to have a few limitations. This paper adopts a non-parametric stochastic dominance (SD) approach to examine the day-of-the-week effects in Chinese stock markets. In contrast to the extensive evidence of day-of-the-week effects disclosed by a parametric mean-variance (MV) approach, our SD tests show that the day-of-the-week effect is much weaker. We find that there are only Wednesday effects in Chinese A-share and B-share stock markets.

A Rapidly New-typed Detection of Norovirus Based on F0F1-ATPase Molecular Motor Biosensor

Zhuo Zhao,Jie Zhang,Mei-Ling Xu,Zhi-Peng Liu,Hua Wang,Ming Liu,Yan-Yan Yu,Li Sun,Hui Zhang,Hai-Yan Wu 한국생물공학회 2016 Biotechnology and Bioprocess Engineering Vol.21 No.1

In order to adapt port rapid detection of food borne norovirus, presently we developed a new typed detection method based on F0F1-ATPase molecular motor biosensor. A specific probe was encompassed the conservative region of norovirus and F0F1-ATPase within chromatophore was constructed as a molecular motor biosensor through the “ε-subunit antibody-streptomycinbiotin- probe” system. Norovirus was captured based on probe-RNA specific binding. Our results demonstrated that the Limit of Quantification (LOQ) is 0.005 ng/mL for NV RNA and also demonstrated that this method possesses specificity and none cross-reaction for food borne virus. What’s more, the experiment used this method could be accomplished in 1 h. We detected 10 samples by using this method and the results were consistent with RT-PCR results. Overall, based on F0F1-ATPase molecular motors biosensor system we firstly established a new typed detection method for norovirus detection and demonstrated that this method is sensitive and specific and can be used in the rapid detection for food borne virus.

A lightweight and flexible CNT/Fe3O4 composite with high electromagnetic interference shielding performance

Zhuo Chao,Yingying Yu,Fang Lei,Dongmei Hu 한국탄소학회 2021 Carbon Letters Vol.31 No.1

Lightweight and flexible electromagnetic interference (EMI) shielding materials are in great demand for wearable EMI device. In the present work, lightweight and flexible carbon nanotube (CNT)/ferroferric oxide ( Fe3O4) composite film was made through a feasible chemical vapor deposition process for CNT film synthesis, followed by a hydrothermal reduction process for Fe3O4 coating. In the as-prepared composite, CNT film and Fe3O4 particles work as conductive skeleton and strong magnetic particle, respectively. The as-prepared composite film shows a novel EMI shielding effectiveness (SE) of 91 dB in the X-band, a small thickness of 0.09 mm and a low density of 0.86 g/cm3, which is superior to most of the carbonbased EMI materials.

The Navigated Oblique Lumbar Interbody Fusion: Accuracy Rate, Effect on Surgical Time, and Complications

Zhuo Xi,Dean Chou,Praveen V. Mummaneni,Shane Burch 대한척추신경외과학회 2020 Neurospine Vol.17 No.1

Objective: The oblique lumbar interbody fusion (OLIF) can be done with either fluoroscopy or navigation. However, it is unclear how navigation affects the overall flow of the procedure. We wished to report on the accuracy of this technique using navigation and on how navigation affects surgical time and complications. Methods: A retrospective review was undertaken to evaluate patients who underwent OLIF using spinal navigation at University of California San Francisco. Data collected were demographic variables, perioperative variables, and radiographic images. Postoperative lateral radiographs were analyzed for accuracy of cage placement. The disc space was divided into 4 quadrants from anterior to posterior, zone 1 being anterior, and zone 4 being posterior. The accuracy of cage placement was assessed by placement. Results: There were 214 patients who met the inclusion criteria. A total of 350 levels were instrumented from L1 to L5 using navigation. The mean follow-up time was 17.42 months. The mean surgical time was 211 minutes, and the average surgical time per level was 129.01 minutes. After radiographic analysis, 94.86% of cages were placed within quartiles 1 to 3. One patient (0.47%) underwent revision surgery because of suboptimal cage placement. For approach-related complications, transient neurological symptoms were 10.28%, there was no vascular injury. Conclusion: The use of navigation to perform OLIF from L1 to L5 resulted in a cage placement accuracy rate of 94.86% in 214 patients.

Suspension Footbridge Form-Finding with Laplacian Smoothing Algorithm

Zhuo-ju Huang,Jie-min Ding,Sheng-yi Xiang 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.6

In this paper, Laplacian smoothing, which is an algorithm originally used to smooth polygon meshes in computer graphics (CG), is applied to solve a structural form-fi nding problem with the proof that the result of such algorithm is equivalent to force density method. Such CG algorithm is used on the design of a new-built suspension footbridge in Shaoxing, China and the algorithm works well. Since Laplacian smoothing is a pure geometric algorithm without any mechanical concept, the algorithm shows the inner relationship between force and shape, more structural applicable CG algorithms are expected to be found in the future.

Size-dependent torsional deformation of silicon nanowires

Zhuo, Xiao Ru,Beom, Hyeon Gyu Elsevier 2018 Materials letters Vol.213 No.-

<P><B>Abstract</B></P> <P>The effect of size on the torsional deformation of [1 1 0]-oriented silicon nanowires is examined via molecular dynamics simulations. The plastic deformation mechanism of silicon nanowires depends on the nanowire diameter. Sub-5.7-nm-diameter silicon nanowires yield by means of a crystal-to-amorphous transition, which nucleates at the outer surface and propagates along the cross-section of the wires. On the other hand, perfect dislocations nucleate at the outer surface of wires whose diameter equals or exceeds 7.7 nm, initiating plastic deformation. These dislocations have a Burgers vector of 1/2 ⟨1 1 0⟩ and slip along the {1 1 1} planes. These findings may enhance our understanding of plasticity of silicon nanowires.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Torsional deformation of [1 1 0]-oriented silicon nanowires is size-dependent. </LI> <LI> Sub-5.7-nm-diameter silicon nanowires yield by a crystal-to-amorphous transition. </LI> <LI> Coaxial dislocations form in nanowires whose diameter equals or exceeds 7.7 nm. </LI> </UL> </P>

Atomistic study of the bending properties of silicon nanowires

Zhuo, X.R.,Beom, H.G. Elsevier 2018 Computational materials science Vol.152 No.-

<P><B>Abstract</B></P> <P>Molecular dynamics simulations are conducted to investigate the mechanical properties and deformation mechanism of silicon nanowires (SiNWs) under pure bending, with a focus on the effects of nanowire diameter, orientation, and cross-sectional shape. The results show that the nanowire diameter and cross-sectional shape do not influence the yield mechanism but the orientation does. In contrast to [1 0 0] and [1 1 0] SiNWs whose yield mechanism is dislocation nucleation, [1 1 1] SiNWs yield by a direct crystal-to-amorphous transition. Moreover, the activated slip plane for [1 0 0] and [1 1 0] SiNWs is different, i.e., {1 1 0} and {1 1 1} plane for [1 0 0] and [1 1 0] SiNWs, respectively. The Young’s modulus of [1 0 0] and [1 1 1] SiNWs is dependent on the nanowire diameter and cross-sectional shape, whereas that of [1 1 0] SiNWs is insensitive to these factors. Furthermore, only the nanowire orientation and cross-sectional shape influence the critical bending strain of [1 0 0] and [1 1 1] SiNWs. The results presented in this work may provide valuable information for the design of nano-devices based on SiNWs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The yield mechanism of silicon nanowires depends on nanowire orientation. </LI> <LI> [1 1 1] silicon nanowires yield by a crystal-to-amorphous transition under bending. </LI> <LI> Effects of several factors on Young’s modulus are investigated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Size-dependent fracture properties of cracked silicon nanofilms

Zhuo, X.R.,Beom, H.G. Elsevier 2015 Materials science & engineering. properties, micro Vol.636 No.-

<P><B>Abstract</B></P> <P>We evaluate the applicability of the critical energy release rate as a crack propagation criterion with a focus on the effect of the material size. Cracked silicon nanofilms of various thicknesses under uniaxial tensile loading are simulated to examine the influence of film thickness on the critical energy release rate. Tensile stress–strain curves in addition to the atomic configurations corresponding to different strain levels are presented to elucidate the deformation mechanism. The cracked silicon nanofilms subjected to mode I loading deform nonlinearly to some extent. The critical energy release rates are calculated by three approaches: a molecular statics simulation, the Griffith criterion, and linear elastic fracture mechanics. Results obtained from these three methods are compared with each other and the differences between them are discussed. The critical energy release rate may be capable of predicting crack propagation when the silicon nanofilms are thicker than approximately 18nm.</P>

Water temperature and salinity tolerance of embryos and spat of the mussel, Musculista senhousia

Zhuo Liang Liang,김영훈,임상민,강경호,Zhi-Fang Zhang 한국패류학회 2009 The Korean Journal of Malacology Vol.25 No.3

The effects of water temperature and salinity on embryonic development and spat survival of mussel Musculista senhousia were investigated. Embryos were incubated in water ranging from 0 to 35℃ and with salinity from 5‰ to 40‰. Mussel spat were tested in water from 0 to 40℃ and with salinity from 0‰ to 100‰. The optimal conditions for mussel embryos were 20-25℃ and salinity from 25‰ to 35‰, based on Within this temperature range, higher temperatures correponded to a shorter duration of the embryonic period. Optimisation of mussel spat survival was at 25-35℃ and salinity from 30‰ to 40‰; both values are higher than those for embryo, which hinted M. senhousia embryos are more vulnerable than spat. Temperatures below 15℃ were lethal for embryos, making temperature a feasible method with which to control the large population of M. senhousia in ark-shell farm during its spawning period.