“晶体”课程及教师理解能力研究

通过对西方课程思潮的研究并在此基础上,提出了"晶体"课程理念,该课程理念以第二代系统论"自组织"为核心依据,"晶体"课程理念是一种课程隐喻,其隐喻表现为四个维度,其主要主张表现为七个方面。该课程的实施对教师的理解能力提出了新的要求,具体包括三个方面。要求教师转变课程身份、重构新的知识观和灵活运用"晶体"教学策略。与此同时,教师所面临的核心工作,具体表现为教师对"晶体"课程资源的设计与应用、教师对"晶体"课程中"学习设计"的应用、教师对"潜结构"课程模体的理解与促成。

小学媒介素养“晶体”课程资源设计及应用研究

该文在大量课程资源研究的基础之上,设计和开发了小学媒介素养"晶体"课程资源,并对其"晶体"课程资源的实施方法进行研究。该文主要从三个方面展开论述,首先,阐述"晶体"课程资源的含义及其意义。其次,论述小学媒介素养"晶体"课程资源的开发和设计。在"晶体"课程资源的开发中,提出了小学媒介素养"晶体"课程资源的设计理念和设计标准,并在此基础上开发了小学媒介素养"课程资源包"和"教材资源"的具体内容,"课程资源包"和"教材资源"二者同时构成了小学媒介素养"晶体"课程资源的有机部分。最后,在小学媒介素养"晶体"课程资源的实施方法上,分别从课程物理环境和课程心理环境两个层面给予探讨并提出新的要求。

小学媒介素养“晶体”课程评价及实践研究

通过大量的媒介素养课程理论研究,在此基础之上提出了小学媒介素养"晶体"课程评价及其评价设计,并对其"晶体"课程实践过程及结果进行评价问题及文化研究。该研究主要运用质化研究方法,以吉林省靖宇县某小学为实验基地进行课程实践。文章共从四个方面展开论述。首先,"晶体"课程评价的提出及其依据;其次,从课程评价的视域、参加者、评价方式和评价标准来阐释"晶体"课程评价的设计;再次,从微观层面上探讨"晶体"课程评价的问题设计及实施方法;最后,以小学媒介素养课程中的"摄影"课程为例,对其进行课程评价的实践及其文化研究,并在此研究基础上提出"教室风险""文化惰性"的概念。总之,全文对小学媒介素养课程进行评价问题及实践研究,旨在完善小学媒介素养课程实践的同时,也为我国小学媒介素养课程实践及评价问题提供可能参考框架。

“晶体”课程及“潜结构”课程模体的实施路径研究

在网络信息时代与后现代课程转向的研究背景下,通过对大量课程思潮的研究,进而提出了"晶体"课程理念。该课程理念以第二代系统论"自组织"为核心依据,具体表现为四个维度的隐喻和七个方面的主张。为实现该课程理念,进一步构建了"潜结构"课程模体。"潜结构"课程模体是"晶体"课程的核心实施方法和路径,分别从不同维度进行阐释并以具体案例加以分析。总之,"晶体"课程在大数据库下具有一定的应用性和创新性,为自组织理论在网络学习中的应用,提供一种可能的参考路径。

“晶体”课程理念及其实施路径研究

该研究在大量课程理念的研究基础之上,在哲学家吉尔·德勒兹"时间—晶体"影像的启发下,提出一种新的课程理念——"晶体"课程理念,其"晶体"课程理念以自组织作为核心隐喻,并通过构建"潜结构"课程模体来探讨"晶体"课程的实施路径。该研究从三个方面进行论述:首先,"晶体"课程理念的提出及相关论述,具体包括"晶体"课程理念的含义及主张、"晶体"课程理念的依据和研究基础、"晶体"课程理念的知识观和教育目的;其次,"潜结构"课程模体的建构,具体从"潜结构"课程模体的提出及其内部诉求两个维度来展开"潜结构"课程模体的建构;最后,对"晶体"课程实施的可能性加以分析。全文通过"晶体"课程理念的构建,旨在为课程理念的理论研究提供可能的参考框架。

“晶体光学”课程改革的探索与思考

针对"晶体光学"的原理抽象不易掌握,内容连贯性强,为方法性和实践性课程等特点,在教学思想体系、教学方法与手段、考试方式与考试内容、教学效果检查等方面做了一些探索和改革,形成了一个比较完整的课程体系.

Experimental and numerical investigations on acoustic damping of monoclinic crystalline wideband sound absorbing structures

In order to overcome the limitations of traditional microperforated plate with narrow sound absorption bandwidth and a single structure,two multi-cavity composite sound-absorbing materials were designed based on the shape of monoclinic crystals:uniaxial oblique structure(UOS)and biaxial oblique structure(BOS).Through finite element simulation and experimental research,the theoretical models of UOS and BOS were verified,and their sound absorption mechanisms were revealed.At the same time,the influence of multi-cavity composites on sound absorption performance was analyzed based on the theoretical model,and the influence of structural parameters on sound absorption performance was discussed.The research results show that,in the range of 100-2000 Hz,UOS has three sound absorption peaks and BOS has five sound absorption peaks.The frequency range of the half-absorption bandwidth(α>0.5)of UOS and BOS increases by 242% and 229%,respectively.Compared with traditional microperforated sound-absorbing structures,the series and parallel hybrid methods significantly increase the sound-absorbing bandwidth of the sound-absorbing structure.This research has guiding significance for noise control and has broad application prospects in the fields of transportation,construction,and mechanical design.

论超星学习通在教学中的应用——以东华理工大学“晶体光学”课程为例

传统教学模式已经不能完全适应当下高校课程数字化、网络化的飞速发展,因此高校部分课程必须改变教学模式。以“晶体光学”课程为例,介绍了该课程在超星移动教学平台上构建和实施过程,并将该课程线上和线下交互式结合,实现了教学模式的转换。学生可以通过超星学习通手机APP客服终端实现线上线下课程学习,有效提高了晶体光学教学质量和教学效果。研究结果可为其他课程移动教学平台构建提供一定的参考。

“晶体光学”课程教学改革研究

文章首先概述了“晶体光学”课程性质,然后分析了“晶体光学”课程教学现状,最后从课程设置、理论教学、实践教学、师资培养四个方面论述了“晶体光学”课程教学改革。

熔化·凝固·沸腾（初二、初三）

物质存在一般有三种形态：固态、液态、气态．在一定条件下，三种状态可以发生相互转化．这里，有三个特殊的温度我们必须注意．它们是：晶体的熔点、凝固点和液体的沸点．它们对应着三个变化过程：熔化、凝固和沸腾．

Pulse-width compression based on photonic crystal fiber

According to the characteristics of high-order solitons,compressed picosecond pulses are numerically simulated in the photonic crystal fiber (PCF),by means of split-step Fourier method. The results show that,PCF enables input pulse with lower peak power to form high-order solitons for the purpose of femtosecond pulse-width compression. For example,60- femtosecond pulse width was made for 1-ps initial pulse width only over the distance of 2.2 m.Besides,shorter optimum fiber length for compression and higher compression ratio could be obtained on the premise of pre-chirp technique.

离子色谱法测定蚀刻槽废氢氟酸中的六氟硅酸

建立了一种新的检测蚀刻槽废氢氟酸中六氟硅酸的离子色谱方法.色谱柱为Metrosep A Supp 7 阴离子交 换柱,流动相为3. 2 mmol/L 碳酸钠-1. 0 mmol/L 碳酸氢钠,流速为0. 7 mL/min.六氟桂酸经过抑制型电导检测 器后进行衍生化反应,在360 nm波长下用紫外检测器检测.六氟硅酸的线性范围为2. 4- 120 mg/L ,相关系数r 2 大于0. 999,定量限为0. 24 mg/L ,平均加标回收率为97. 2%.本方法还可以同时利用电导检测器检测废氢氟酸中 的氢氟酸、醋酸、盐酸、硝酸、磷酸和硫酸的含量.该方法快速、准确,适用于蚀刻槽液中六氟硅酸的检测.

环维黄杨星D-甲醇结晶体对大鼠心室肌细胞内向整流钾电流的影响

目的:观察环维黄杨星D(Cyclovirobuxine D,CVB-D)-甲醇结晶体溶液对大鼠单个心室肌细胞内向整流钾电流(in-ward rectifier current,IK1)的影响。方法:Langendorff灌流系统灌流大鼠离体心脏,急性酶解法获得单个心室肌细胞;全细胞膜片钳技术分别记录对照组、药物组及洗脱组的IK1曲线。结果:对于大鼠心肌细胞,在钳制电位-100 mV时,给予低浓度(4×10-4g/L)、高浓度(4×10-3g/L)CVB-D-甲醇结晶体溶液后,IK1内向电流峰值和内向电流稳态值与给药前相比均明显降低,IK1外向电流峰值也明显受到抑制。使用细胞外液灌流洗脱药液后,与给药后相比IK1内向电流峰值和内向电流稳态值均升高,IK1外向电流峰值升高显著。结论:4×10-4g/L组和4×10-3g/L组CVB-D-甲醇结晶体溶液对IK1内向电流成分和外向电流成分均具有可逆性抑制效应,这可能是其具有延长动作电位时间与抗心律失常作用的药理机制之一。

Construction of three high-nuclearity heterometallic cluster organic frameworks by introducing a bifunctional tripodal alcohol ligand

Three new metal organic frameworks,[Mn^(Ⅲ)_(4)Mn^(Ⅱ)_(8)O_(2)(4-thmpy)_(4)(O_(2)CPh)_(10)(OMe)_(2)(H_(2)O)_(2)]·3CH_(3)OH·4H_(2)O(1),[Mn^(Ⅱ)_(4)Co^(Ⅱ)_(6)O(4-thmpy)_(4)(O_(2)CPh)_(6)(H_(2)O)_(4)]·CH_(3)OH·3H_(2)O(2),and[Mn^(Ⅱ)_(4)Ni^(Ⅱ)_(6)O(4-thmpy)_(4)(O_(2)CPh)_(6)(H_(2)O)_(4)]·2CH_(3)OH·2H_(2)O(3),have been successfully synthesized by using 4-[tri-(hydroxymethyl)methyl]pyridine(4-thmpyH_(3))as ligand.Crystal structure analyses show that compound 1 is a disk-like twelve nuclear[Mn^(Ⅲ)_(4)Mn^(Ⅱ)_(8)]0D cluster.Compounds 2 and 3 are isomorphic,and the decanuclear heteronuclear cluster[Mn^(Ⅱ)_(4)Co^(Ⅱ)_(6)]node in compound 2 can be seen as a hyper-tetrahedron of four coboundary cubic alkanes[Mn^(Ⅱ)Co^(Ⅱ)_(3)O_(4)],then each ten-nuclear heteronuclear cluster[Mn^(Ⅱ)_(4)Co^(Ⅱ)_(6)]is connected by six 4-thmpy^(3-)with six adjacent decanuclear clusters[Mn^(Ⅱ)_(4)Co^(Ⅱ)_(6)],forming the NaCl-type 3D topological structure.Magnetic studies showed that there exist antiferromagnetic interactions between metal ions in 1-3.

Effect of wire diameter compression ratio on drawing deformation of micro copper wire

A crystal plasticity finite element model was developed for the drawing deformation of pure copper micro wire,based on rate-dependent crystal plasticity theory.The impact of wire diameter compression ratio on the micro-mechanical deformation behavior during the wire drawing process was investigated.Results indicate that the internal deformation and slip of the drawn wire are unevenly distributed,forming distinct slip and non-slip zones.Additionally,horizontal strain concentration bands develop within the drawn wire.As the wire diameter compression ratio increases,the strength of the slip systems and the extent of slip zones inside the deformation zone also increase.However,the fluctuating stress state,induced by contact pressure and frictional stress,results in a rough and uneven wire surface and diminishes the stability of the drawing process.

Polycrystalline ZSM-5 Aggregates Induced by Seed and Catalytic Performance in Methanol to Hydrocarbon

Synthesis of ZSM-5 zeolite typically utilizes small molecule polyamines or quaternary ammonium salts as organic structure guiding agent(OSDA).By contrast,the OSDA-free hydrothermal synthesis system eliminates the use of organic templates and the subsequent calcination procedure.This not only reduces the cost of synthesis,but also prevents environmental pollution from the combustion of organic templates,representing an eco-friendly approach.Despite this,literature suggests that even so-called template-free synthesis systems often involve trace amount of organic substances like alcohol.In the present work,a calcined commercial ZSM-5 zeolite was served as seed,with sodium aluminate as aluminum source and silica sol as silicon source,ensuring an entirely template-free synthesis system.Polycrystalline ZSM-5 aggregates consisted of rod-like nanocrystals were successfully prepared in the completely OSDA-free system.Effects of the Si/Al ratio in ZSM-5 seed,dosage and crystallization conditions such as crystallization temperature and crystallization time on ZSM-5 synthesis were investigated.The results show that a highly crystallinity ZSM-5 aggregate consisting of primary nano-sized crystals less than 100 nm is produced from a gel precursor with 5.6%(in mass)seed after hydrothermal treatment for 48 h.Furthermore,the Si/Al ratio in ZSM-5 seed has little effect on the topological structure and pore structure of the synthesized samples.However,the seeds with a low Si/Al ratio facilitate faster crystallization of zeolite and enhance the acidity,especially the strong acid centers,of the catalyst.The catalytic performance of the synthesized polycrystalline ZSM-5 was evaluated during dehydration of methanol and compared with a commercial reference ZSM-5r.The results exhibit that as compared with the reference catalyst,the fabricated sample has a longer catalytic lifetime(16 h vs 8 h)attributed to its hierarchical pores derived from the loosely packed primary nanoparticles.Additionally,the prepared polycrystalline catalyst also exhibits a higher aromatics selectivity(28.1%-29.8%vs 26.5%).

Application and optimization design of non-obstructive particle damping-phononic crystal vibration isolator in viaduct structure-borne noise reduction

The problems associated with vibrations of viaducts and low-frequency structural noise radiation caused by train excitation continue to increase in importance.A new floating-slab track vibration isolator-non-obstructive particle damping-phononic crystal vibration isolator is proposed herein,which uses the particle damping vibration absorption technology and bandgap vibration control theory.The vibration reduction performance of the NOPD-PCVI was analyzed from the perspective of vibration control.The paper explores the structure-borne noise reduction performance of the NOPD-PCVIs installed on different bridge structures under varying service conditions encountered in practical engineering applications.The load transferred to the bridge is obtained from a coupled train-FST-bridge analytical model considering the different structural parameters of bridges.The vibration responses are obtained using the finite element method,while the structural noise radiation is simulated using the frequency-domain boundary element method.Using the particle swarm optimization algorithm,the parameters of the NOPD-PCVI are optimized so that its frequency bandgap matches the dominant bridge structural noise frequency range.The noise reduction performance of the NOPD-PCVIs is compared to the steel-spring isolation under different service conditions.

Regulating crystal phase of TiO_(2) to enhance catalytic activity of Ni/TiO_(2) for solar-driven dry reforming of methane

Ni/TiO_(2) catalyst is widely employed for photo-driven DRM reaction while the influence of crystal structure of TiO_(2) remains unclear.In this work,the rutile/anatase ratio in supports was successfully controlled by varying the calcination temperature of anatase-TiO_(2).Structural characterizations revealed that a distinct TiO_(x) coating on the Ni nanoparticles(NPs)was evident for Ni/TiO_(2)-700 catalyst due to strong metal-support interaction.It is observed that the TiOx overlayer gradually disappeared as the ratio of rutile/anatase increased,thereby enhancing the exposure of Ni active sites.The exposed Ni sites enhanced visible light absorption and boosted the dissociation capability of CH4,which led to the much elevated catalytic activity for Ni/TiO_(2)-950 in which rutile dominated.Therefore,the catalytic activity of solar-driven DRM reaction was significantly influenced by the rutile/anatase ratio.Ni/TiO_(2)-950,characterized by a predominant rutile phase,exhibited the highest DRM reactivity,with remarkable H_(2) and CO production rates reaching as high as 87.4 and 220.2 mmol/(g·h),respectively.These rates were approximately 257 and 130 times higher,respectively,compared to those obtained on Ni/TiO_(2)-700 with anatase.This study suggests that the optimization of crystal structure of TiO_(2) support can effectively enhance the performance of photothermal DRM reaction.