Uncertainty Calculator vs Scratch启蒙

Uncertainty Calculator evaluates the error propagation throughout the mathematical expressions comprised of variables of uncertain value. The application allows input of up to three value-error pairs (A, B and C), that can be used as a parameters in the final expression. Error values should be provided in absolute (100 +/- 5) or in relative format, the latter should appear in percent format (100 +/- 5%). The evaluated expression can include numerous functions, that provided by row of the appropriate buttons. Components and functions can be added directly to the expression field by pressing the corresponding buttons. To encompass expression into the preset formula, select the expression and press the corresponding formula button. Particular attention should be paid to placing brackets to avoid equation ambiguity. The application deals with independent, random errors. So if this is a case never use A + A, but rather 2*A and never A*A*A but rather A^3! Obviously, different parameters can be combined in any way (A+B or C *A^2 .. is perfectly fine). Angles for trigonometric functions can be provided in degrees or radians, and that should be reflected by setting a yellow button to "DEG" or "RAD". Bear in mind the importance of units in any of calculations! Implementation Examples: 1.The charge passing through an electrical circuit is defined by: Q = I * t, where I is the current and t is the time. Calculate the total charge value when a current of 0.15 ± 0.01 A passes through the circuit for 120 ± 1 s: Input: A = 0.15 ± 0.01, B = 120 ± 1 The final expression will be A*B, and press Calculate: The final value will be: 18 ± 1.2 Thus, it can be reported the total charge as 18 C ± 1 C. Important! One should only report as many significant figures as are consistent with estimated error! So the value should be rounded to the rightmost decimal place at which error applies. 2. A ball is tossed straight up into the air with initial speed vo = (4.0± 0.2) m/s. After a time t = (0.60 ± 10%) s, the height of the ball is h = vo*t - 0.5gt^2 = 0.636 m (g = 9.80 m/s^2). What is the value and uncertainty of height? Input: A = vo = 4.0 ± 0.2, and B = t = 0.60 ± 10%, then the final expression should be: A*B – 0.5*9.8*B^2 The final value will be: 0.6 ± 0.4 (meters).

绘编程是一个入门级的编程语言，它的核心理念是基于情景化编程，情境主要来自于孩子身边科学、来自孩子绘本阅读的素材中。它可以让幼儿 ( 5-7岁 ) 创建互动的故事和游戏，孩子利用图形化的程序积木让角色移动、跳跃、舞蹈、唱歌。孩子也可以利用绘图编辑器绘制自己的角色、用麦克风录制自己声音、用照相机加入自己拍摄的照片。最后用拼积木的方法组合成程序，让他们心中的角色动起来。 绘编程这个软件的创作灵感来自于 Scratch。在全球有数以百万计的年轻人 ( 8 岁以上 ) 使用 Scratch，是个非常受欢迎的编程语言。而绘编程 则重新设计操作界面及编程语言，让它更适合幼儿，尤其专注将功能设计地更符合他们的认知、个人、社会、情感发展。 编码 ( 或电脑编程 ) 是新世代的必备素养，就像写作能帮助你组织思路、表达观点，编程也是一样。在过去，编程很难普及，但我们认为每个人都该具备这样的能力，就像写作能力一样。