2084,你好!

2084年:见信好。我估计不能活着见到你了,所以写封信给你,聊聊我希望的你的样子。到时候这封信能见到你,你也能读到这封信,也算你我神会。第一,希望你有足够干净的食物、水、和空气。到了2084年,除了雨雪雷电的日子,天基本是蓝     

化学能与热能、盖斯定律的综合应用

最新《考试大纲》要求考生能正确理解化学反应中物质变化和能量变化的关系.根据考纲的这一要求将化学反应中的物质变化和能量变化综合起来考查将成为一种热门的题型,同时注意到由于能源日益匮乏,因此有关燃烧     

从高考题看两个守恒定律的综合应用

动量守恒定律与能量守恒定律是高中物理中两个最重要的基本规律,在力学中能量守恒定律则表现为机械能守恒定律,它们在物理学中得到广泛应用.历年的高考物理试题对动量和能量的考查都占有较大比重,并且经常是考查一些常见的模型,要用动量和能量的观点解决,题目综合性强、灵活性大、分析能力要求较高.因此,在高考物理总复习中,必须引起高度重视.     

炸弹，炸弹，快显形

植物在整个生物界中是最基础的一类生物,它们为人类提供了食物和能量来源,装点并美化了人类的生存环境。最近,美国科学家又发现了植物的新用途,即可以经过基因改造后用来反恐,发现那些隐蔽的炸弹。     

3DV quality model based depth maps for view synthesis in FTV system

Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems.When depth maps are derived using existing depth estimation methods,the depth distortions will cause undesirable artifacts in the synthesized views.To solve this problem,a 3D video quality model base depth maps (D-3DV) for virtual view synthesis and depth map coding in the FTV applications is proposed.First,the relationships between distortions in coded depth map and rendered view are derived.Then,a precisely 3DV quali...     

Extraction of novel features for emotion recognition

Hilbert-Huang transform method has been widely utilized from its inception because of the superiority in varieties of areas. The Hilbert spectrum thus obtained is able to reflect the distribution of the signal energy in a number of scales accurately. In this paper, a novel feature called ECC is proposed via feature extraction of the Hilbert energy spectrum which describes the distribution of the instantaneous energy. The experimental results conspicuously demonstrate that ECC outperforms the traditional short-term average energy. Combination of the ECC with mel frequency cepstral coefficients (MFCC) delineates the distribution of energy in the time domain and frequency domain, and the features of this group achieve a better recognition effect compared with the feature combination of the short-term average energy, pitch and MFCC. Afterwards, further improvements of ECC are developed. TECC is gained by combining ECC with the teager energy operator, and EFCC is obtained by introducing the instantaneous frequency to the energy. In the experiments, seven status of emotion are selected to be recognized and the highest recognition rate 83.57% is achieved within the classification accuracy of boredom reaching 100%. The numerical results indicate that the proposed features ECC, TECC and EFCC can improve the performance of speech emotion recognition substantially.     

Adaptive early termination of fast mode decision in MVC based on inter-view correlation

Variable size motion estimation (ME) and disparity estimation (DE) are employed to select the best coding mode for each macroblock (MB) in the current joint multiview video model (JMVM).This technique achieves the highest possible coding efficiency,but it results in extremely large computation complexity which obstructs the multiview video coding (MVC) from practical application.This paper proposes an adaptive early termination of fast mode decision algorithm for MVC.It makes use of the coding information o...     

变3,霸气外露

会变形的不一定是被奥特曼打的小怪兽,叫金刚的也不一定就爱爬帝国大厦。总之,无论和"变形",还是和"金刚"有关系的,听起来都不怎么善良。还记得那年夏天有一个叫萨姆(Sam)的高中生吗?他唯一的愿望是拥有一辆属于自己的车。为了筹集买车的费用,他决定变卖祖父的一副古董眼镜。谁知,这副眼镜招来了一群     

科学预设，动态生成

随着科学探究活动的不断深入,学生在对生命领域内容的科学研究中,会发现一些有深度和具有科学意义的问题,如何引导学生通过自主探究、亲身体验并有效解决这些问题呢？我们以《谁吃谁》一课为载体,不断探究实践,在课前进行合理科学的预设,指导学生进行有效探究与体验,通过一系列探究、体验、感悟活动,让学生认识到生物之间的复杂的食物能量交换关系,在课堂上实时生成属于孩子自己的科学概念。     

火柴头爆炸实验改进

为了说明化学反应中伴随着能量的释放,沪教版《义务教育课程标准实验教科书·化学》上册中安排了“加热试管中的火柴头”实验。笔者利用生活中的素材做如下设计：