关注课堂“生成” 激发学生智慧

"动态生成"是新课程改革的核心理念之一。针对传统教学的弊病,新课程改革要求从生命的高度,用"动态生成"的观点看待课堂教学,课堂教学不只是一种特殊的认识过程,而且是师生人生中的一次重要的生命经历,它必须是真实的,体现学生主体地位的。课程内容、课程的具体实施以及学生对课程的理解也是"动态生成"的。本文先谈"生成性"问题的重要性到巧妙捕捉"生成"为教学服务的创造性处理的积极心态,接着从上课、备课、练习等方面如何激发"生成"为教学服务提出了自己的观点。

Enhanced recovery programme in colorectal surgery:Does one size fit all?

Enhanced recovery after surgery(ERAS) employs a multimodal perioperative care pathway with the aim of attenuating the stress response to surgery and accelerating recovery.It has been difficult to determine the relative importance of some of the individual components of these pathways such as epidural analgesia and laparoscopic colorectal surgery.Some argue that only a rigid adherence to the published ERAS protocol can achieve the proposed benefits of fast-track surgery.In this article,we explore some of the areas where the evidence base may be changing and ask whether a more flexible and individualised approach should be considered.

Calculation model and mechanism analysis for rain-wind-induced vibration of stay cable

Rain-wind-induced vibration of cable was studied based on previous research achievements. According to the quasi-steady assumption, the governing equation of vertical motion of the cable was derived and the criterion for unstable motion and occurrence mechanism was studied. A comparison was performed between the oscillation responses of the stay cable obtained from calculated model and previous results. The results indicate that the analysis model can reflect the main characteristics of wind-rain-induced vibrationt of the cable which is amplitude- and velocity-restricted, and it is probably related with the periodic vortex shedding of wake flow. It is essential for the occurrence of rain-wind-induced or wind-induced vibration of cable that the derivative of lift coefficient with respect to transient angle of attack is less than zero. When rain-wind-induced vibration occurs, the aerodynamic force has a dual function for the vibration, and the maximum amplitude of stayed-cable is determined by the relative value of aerodynamic exciting force and aerodynamic damping force.

The Difference of Lemma Activation Between Native Speakers of English and L2 Speakers of English With L1 Chinese:Evidence From the Semantic and Phonological Priming Effects on L2 Speech Planning

This study examined the influence of semantic and phonological priming on L2 speech planning,as well as the difference between native and non-native speakers of English in terms of lemma activation.Two potential explanations for the contrast between the performance of L2 speakers and native controls were considered.The first of which was that L2 speakers’ phonological forms are activated before selection of syntactic frame occurred,whereas the reverse is true for native speakers.The second explanation posits that the organisation of the speech production procedure is fundamentally similar in native and L2 speakers,and the disparity in performance arises from difference in the levels of activation of stored items.The results of the present experiment suggest that lemma selection is indeed what drives syntactic frame selection.However,lemmas in L2 speakers can be primed through a chain of connections demonstrated as:L2 phonological form →L1 phonological form → L1 lemma.

Metal complexes of a novel bis-β-diketone-type ligand and its copper(Ⅱ) complexes of two-photon biological imaging

A curcumin derivative ligand,1,7-bis(3-methoxyl-4-acetoxyl)phenyl-1,6-heptadiene-3,5-diketone (diacetylcurcumin,abbreviated as HL),and its Cu and Ni complexes have been synthesized and fully characterized by elemental analyses,IR,1 HNMR and molar conductivity.The resulting complexes exhibit two-photon excited fluorescence (TPEF) in DMF,and have been proven to be potentially useful for two-photon microscopy imaging in living cells.In addition,cytotoxicity tests showed that the low-micromolar concentrations of ML 2 did not cause significant reduction in cell viability over a period of at least 24 h and should be safe for further biological studies.