• MIT Engineers Show How Hairy Tongues Help Bats Drink
    Animals have evolved all manner of adaptations to get the nutrients they need. For nectar-feeding bats, long snouts and tongues let them dip in and out of flowers while hovering in mid-air. To help the cause, their tongues are covered in tiny hairs that serve as miniature spoons to scoop and drag up the tasty ...
  • 07-12
    蓝冠注册 超过围观 0条评论
    蓝冠注册《Q374919》该电路可分为逆变器和充电器两部分。逆变器部分建立在定时器NE555,蓝冠 而充电器部分建立在3端可调调节器LM317。在逆变器部分,NE555被接线为一个产生15kHz方波的不稳定多谐振荡器。IC 555的输出引脚3通过电阻R4连接到由晶体管SL...