Ağu 162016
 
813 views

Toz zerresi büyüklüğünde kablosuz algılayıcılar

Bilim-kurgu filmleri veya öykülerinde görmeye alışık olduğumuz araç gereçleri gündelik yaşamımızın içinde görmeye giderek daha fazla alışıyoruz. Bir toz zerresi boyutundaki kablosuz algılayıcılar da bunlardan biri. Bu cihazlara “neuronal dust” (sinirsel toz) adı veriliyor ve insan vücuduna kolayca yerleştirilebiliyor.

Sinirsel tozların enerji gereksinimi dışarıdan kolayca temin edilebiliyor. Ayrı bir pil veya batarya sistemine gerek yok. Hatta bu cihazlar, sinir ve kasları uyarma potansiyeline de sahip.

Deneyler halen kobaylar üzerinde sürdürülüyor. Kaslara ve periferik sinirlere yerleştirilen bu aygıtlar ultraseslere duyarlı. Bu sayede hem gereken enerjiyi sağlıyor, hem de gerekli okumaları yapabiliyorlar.

Science News Journal‘de yayınlanan bir makale konuya ilişkin pek çok ayrıntıya sahip.
Okumanızı öneriyorum. Sayfada, sinirsel tozların boyutlarını kavramanıza yarayacak bir de video var.

Toz zerresi büyüklüğünde kablosuz algılayıcılar

Image Credits: ScienceNewsJournal

Alıntı: http://sciencenewsjournal.com/engineers-create-first-dust-sized-wireless-sensors-can-implanted-human-body/

Kas 222015
 
3.740 views

History of bike

First known bikes are invented in 19th century. However there are some unverified claims about “bicycle-like machines” from 15th century. (See details in wikipedia).

Crazy bikes

Photo credits: en.wikipedia.org

The first known bicycle was invented by German Baron Kar von Drais. It was called Draisine and patented in 1818.

The first “pedal-operated bicycle” was invented by a French metalworker in 1863.

Ball bearings are started being used in 1877.

“In 1885, British inventor John Kemp Starley designed the first ‘safety bicycle’ with a steerable front wheel, two equally-sized wheels, and a chain drive to the rear wheel.”

Inflatable tubes are invented in 1888.

Back-pedal brakes are invented in 1889.

“Paul de Vivie invents a two speed rear derailleur gear” in 1905.

Disk brakes are invented in 1994.

There are lots of different designs in bicycle history. However the main concept remained the same: two wheels, man-power, pedals, and a power transmission system.

Crazy bikes

Photo credits: en.wikipedia.org

In the following video bike’s history is summarized:

References:

Kas 192015
 
3.549 views

Foldable wireless keyboard

Foldable wireless keyboard

Photo credits: www.gizmag.com

Do you have problems with your touch-screen smartphone or tablet keyboard because of its ultra small size?

Then, LG serves a solution for you: Rolly. It is a foldable, wireless mini-size keyboard that can be transported easily. When you fold it, it becomes a stick.

Rolly maintains its connection via Bluetooth 3.0. As a power source, it uses a single AAA size battery. The battery is operational for three months without a need to recharge.

You can connect Rolly to two devices at the same time, and you can switch between these devices pressing a button.

If you don’t prefer virtual keyboard alternatives, you can purchase an LG Rolly.

Ahmet Aksoy

References: