関連する実験動画

Updated: Jul 8, 2026

Research and Development of High-performance Explosives
10:33

Research and Development of High-performance Explosives

Published on: February 20, 2016

軍事研究:研究者は,弾道ミサイル防衛計画における欠陥をターゲットにしています

D Malakoff, A Cho

    Science (New York, N.Y.)
    |September 11, 2007
    PubMed
    まとめ

    提案された米国のミサイル防衛システムは,本物の弾頭と偽物の弾頭を区別する技術的な欠陥のため,科学者の批判に直面している. これにより,システムの有効性や導入の遅延の可能性に関する懸念が高まっています.

    さらに関連する動画

    Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction08:14

    Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction

    Published on: September 16, 2016

    Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation11:41

    Evaluation of an Exclusive Spur Dike U-Turn Design with Radar-Collected Data and Simulation

    Published on: February 1, 2020

    関連する概念動画

    Projectile Motion: Example01:18

    Projectile Motion: Example

    The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
    When we speak of the range (R) of a projectile on level...
    Two-Dimensional Force System01:20

    Two-Dimensional Force System

    A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
    Design Consideration01:22

    Design Consideration

    Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
    The factor of safety is another key aspect...
    Deflection of a Beam01:19

    Deflection of a Beam

    Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
    Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
    Maximum Deflection01:13

    Maximum Deflection

    When analyzing beams under unsymmetrical loads, such as a train moving on a bridge, it is crucial to accurately determine the points of maximum stress and deflection. The process involves identifying the maximum deflection of the beam, which may not always occur at its midpoint due to the uneven distribution of the load.
    The maximum deflection occurs at a specific point, known as point O, where the tangent to the deflection curve is horizontal. To find point O, the slope of the tangent at any...
    Real-World Applications of Space Curves01:29

    Real-World Applications of Space Curves

    Modern aerospace navigation depends on the accurate prediction of motion in three-dimensional space. In defense applications, radar systems continuously track both interceptors and moving aerial targets to find whether their flight paths will result in a collision. These motions are modeled mathematically as space curves, which represent paths that change continuously with time. Each object’s position is described by a vector function that specifies its location in terms of time-dependent...