Tag: paper

Ebooks worse than paper

kindle-waterBad news for readers of ebooks, a team of boffins have worked out that if you read information on a tablet you are less likely to take it in.

A new study which found that readers using a Kindle were “significantly” worse than paperback readers at recalling when events occurred in a mystery story.

The study gave 50 readers the same short story by Elizabeth George to read. Half read the 28-page story on a Kindle, and half in a paperback, with readers then tested on aspects of the story including objects, characters and settings.

Anne Mangen of Norway’s Stavanger University, a lead researcher on the study, was looking for differences in the immersion facilitated by the device, and in emotional responses.

What she found was that Kindle readers performed significantly worse they were asked to place 14 events in the correct order.

The researchers think that “the haptic and tactile feedback of a Kindle does not provide the same support for mental reconstruction of a story as a print pocket book does”.

Mangen said that When you read a paper book, it is possible to make sense of the flow of the book because your fingers feel a pile of pages on the left growing, and shrinking on the right.  This gives the reader a tactile sense of progress.

A similar test in Norway gave kids texts to read in print, or in PDF on a computer screen, followed by comprehension tests. She and her fellow researchers found that “students who read texts in print scored significantly better on the reading comprehension test than students who read the texts digitally.”

What is worrying is that “research shows that the amount of time spent reading long-form texts is in decline, and due to digitisation, reading is becoming more intermittent and fragmented”, with evidence indicating that the use of devices might negatively impact cognitive and emotional aspects of reading..

Mangen said that there needed to be research and evidence-based knowledge provided to publishers on what kind of devices should be used for what kind of content; what kinds of texts are likely to be less hampered by being read digitally, and which might require the support of paper.

 

 

Boffins print memory onto paper

postitA group of researchers from Taiwan has emerged from smoke filled labs with a method that uses ink-jet technology to print working memory on an ordinary piece of paper.

If the invention takes off then electronics printed on paper could could lead to applications such as smart labels on foods and pharmaceuticals or as wearable medical sensors.

While engineers have managed to print transistors and solar cells on paper, in the past, they have been unable to do memory.

Paper is made of fibre making it difficult to lay down the thin, uniform layers of materials that typical memory technologies need.

To get around this problem, the team, led by Ying-Chih Liao, Si-Chen Lee, and Jr-Hau He of National Taiwan University decided to build resistive random access memory (RRAM), a relatively new type of memory with a structure simple enough to cope with such surface variations.

In an RRAM device, an insulator can be set to different levels of electrical resistance by applying a voltage across it; one level of resistance corresponds to the 1s of digital logic, the other to the 0s. So each bit in RRAM consists of an insulator sandwiched by two electrodes.

The device was built with silver, titanium dioxide, and carbon, although other combinations of a metal, an insulator, and a conductor could be used. They started by using a screen-printing process to coat a carbon paste onto the paper to form the bottom electrode. The process was repeated 10 times to reduce roughness, then the coated paper was cured at 100 °C for 10 minutes in a vacuum.

Ink was made by mixing TiO2 nanoparticles in acetyl acetone and used an ink-jet printer to deposit a layer of the particles on top of the carbon, where it would act as the insulator. Once that dried, the researchers used a solution of ethylene glycol and water containing silver nanoparticles, and they printed silver dots on top of the TiO2 layer to serve as top electrodes.

The memory paper was robust and could be bent at least 1,000 times with no degradation in performance.