Classes which are arranged in a circle make quite a strong statement about what the teacher and the students believe in. With all the people in the room sitting in a circle, there is a far greater feeling of equality than when the teacher stays out at the front. This may not be quite so true of the horseshoe shape, where the teacher is often located in a commanding position, but, even here, the rigidity that comes with orderly rows, for example, is lessened.

      With the horseshoe and circle seating, the classroom is a more intimate place and the potential for students to share feelings and information through talking, eye contact or expressive body movements (eyebrow-raising, shouldershrugging, etc.) is far greater than when they are sitting in rows.

                                      (Harmer, J. The practice of English language teaching. 2007)

1. What is an analog-digital converter?

An Analog-Digital Converter (ADC) is a widely used electronic component that converts an analog electric signal (usually a voltage) into a digital representation. The ADCs are at the front-end of any digital circuit that needs to process signals coming from the exterior world. Its schematic symbol is:

The output of a microphone, the voltage at a photodiode or the signal of an accelerometer are examples of analog values that need to be converted so that a microprocessor can work with them.

2. How does the ADC convert a signal?

Many ways have been developed to convert an analog signal, each with its strengths and weaknesses. The choice of the ADC for a given application is usually defined by the requirements you have: if you need speed, use a fast ADC; if you need precision, use an accurate ADC; if you are constrained in space, use a compact ADC.

All ADCs work under the same principle: they need to convert a signal to a certain number of bits N. The sequence of bits represents the number and each bit has the double of the weight of the next, starting from the Most Significant Bit (MSB) up to the Least Significant Bit (LSB). In a nutshell, we want to find the sequence of bits bN−1, bN−2, ..., b0 that represents the analog value Vin as Vin=∑n=0N−1bn2nVref2N.

                                (www.onmyphd.com/?p=analog.digital.converter. Adaptado)

                                         Knowledge and the library

      It was not until the development of monastic libraries in Europe around 1200 that humanity amassed in a single place what approached the collective wisdom and knowledge of the age. Libraries may be exchanges of information and market places for ideas but they are also the buildings which contain the bulk of human knowledge. Or, at least they were until the electronic digitally stored information revolution of the 1980s.

      Now knowledge is virtually everywhere; it has broken free of the constraint of buildings. Today if you were today to destroy all the world’s libraries, it is unlikely that more than 20% of human knowledge would be lost. Certainly, a large amount of archival material would disappear forever, but a substantial volume of knowledge would survive. If a library is a repository of knowledge, this is now just one of its functions. The library’s prime function is now making that knowledge available and encouraging exchange and reflection upon it.

      Electronic knowledge is nowadays available to everybody – in the home, workplace, airport terminal, school, and so on. The Internet has liberated the library; nevertheless, it has not removed the justification for library facilities.

                 (www.sciencedirect.com/science/article/pii/B978185617619410017X. Adaptado)

Schools of thought: can mindfulness lessons boost child mental health?

      Children are taking 10 minutes out from the hurly burly school day to reflect on their thoughts and their feelings. Some ground themselves by thinking about their feet on the floor, while others concentrate on their breathing.

      This is mindfulness, the lessons quickly growing in popularity as an antidote to the stress of being a young person in the 21st century, be it pressure to perform in exams, social media, or the obsession with body image that is reported to even affect primary age children.

      Children are learning about their brains and how to deal with unruly thoughts – to control emotions such as anger and fear. It is no longer head, shoulders, knees and toes, but amygdala, hippocampus and pre-frontal cortex.

      The most recent NHS survey of young people’s mental health in 2017 shows one-in-eight 5- to 19-year-olds in England has a diagnosable mental health condition. Hospital admissions for anorexia alone more than doubled in the eight years to 2017/18.

      Stress is a known barrier to learning and a growing number of schools are targeting the emotional health of pupils through schemes such as meditation, mindfulness and the provision of mental health first aiders and buddies.

      The Mental Health Foundation charity wants emotional wellbeing to be at the heart of the school curriculum, and has chosen body image as the key theme of this year’s Mental Health Awareness Week. Dr Antonis Kousoulis, its assistant director, said its survey last year found 47% of people aged 18-24 had experienced stress over their body image to the extent of being overwhelmed or unable to cope. “Social media has certainly played a part,” he says. “Historically, it was the mirror that was the main driver of perception of our image and how we thought others perceived us. Nowadays, young people are exposed almost on a 24/7 basis to manipulated and heavily edited images, whether that’s in advertising or photos of their friends.”

      Over the past five years there has been a proliferation of mindfulness organisations and companies selling lesson plans and staff training to schools. But does it work?

      Secondary school teacher Richard Burnett, who founded the Mindfulness in Schools Project 10 years ago, warns against “quick fix” approaches. “We are a charity started by teachers who wanted to teach children how best to manage their thoughts and feelings and deal with the rollercoaster of being a young person,” he says.

      It has two training courses for teachers – one aimed at secondary students and another for younger classes. “It’s about training your attention to notice what is going on. If you are aware of that, you can choose how to respond, for example to manage the amygdala, the part of the brain that detects fear and prepares a response,” he says.

      Emotional disorders are on the rise, and we should instil something in our children and young people about coping with stress, advises Lee Hudson, the Royal College of Paediatrics and Child Health’s mental health lead. But should it be mindfulness? There is evidence that the process can bring benefits to adults, he says. “[But] the evidence for its effectiveness with children is not yet sufficiently robust and we need more research. However, some schools are rolling it out and children seem to enjoy it – and it unlikely to cause harm.”

(Available in: https://www.theguardian.com/society/2019/may/16/mindfulness-lessons-child-mental-health. Accessed on May 17th, 2019. Adapted.) 

TOURISM IN TURKEY

Turkey's Tourism Took a Hit in 2016

by Isabel von Kessel,

Jul 13, 2017  

Several major terrorist attacks in(1)____ Ankara, Istanbul and Diyarbakir, as well as an attempted coup d'état one year ago, made 2016 one of the worst years for (2)_____ Turkish tourism industry. After a ten-year-high of nearly 36,8 million visitors arriving in 2014, Turkey is facing a severe backlash that is hitting its tourism sector the hardest. Following the coup on 15 July 2016 and subsequent purges in Turkey, foreign visitor numbers have dropped dramatically (70 percent). By the end of last year visitor numbers fell to 25,4 million. While European holidaymakers and business people (notably the British and Germans) are still reluctant to pay a visit to Turkey, visitor numbers nevertheless increased from January to May 2017 by 16.3 percent when compared to the same time frame of the previous year. However, Russian citizens are increasingly making up for the declining tourist numbers from other countries: with more than 928,000 visitors coming from Russia up until the end of May, Germany was displaced as (3)_____ largest source of tourism for Turkey. (…)  

Source:https://www.statista.com/chart/10270/tourism-in-turkey/(adapted)

Access:22^nd April, 2019  

How can you stop your kids viewing harmful web content?

As concerns grow about the effect of harmful social media content on our children, we look at what tools are available for parents to regulate what kids see and how long they spend online.  

The struggle to prise them away from a life spent online is a familiar one for many beleaguered parents. Our youngsters spend hours on Instagram chasing "likes" - and often coming up against cyber-bullying - or playing games, obsessing about YouTube influencers or surfing between different "friendship groups" on WhatsApp. 

So how can we keep them safe from harmful content?

Content filtering software has been around for many years, but parents have often been too tech-shy to work it properly. And it often required children to hand over their passwords - a potential cause of family rows. 

 But now a new generation of digital parental controls has arrived on the market, promising to help parents take back control more easily.

• • UK plans social media and internet watchdog 

Circle with Disney, Koala Safe and Ikydz, for example, are systems that claim to be able to control every digital device in your home with a few taps on a smartphone app. use, but is ? 

The new products work by connecting to your existing household wi-fi router. In the case of Circle you plug in the white cube - clearly inspired by the Apple school of design - and it immediately lists every connected phone, laptop, tablet, and so on in your home, and offers a variety of ways to control them. (…) 

 (…) Anne Longfield, the Children's Commissioner for England, thinks it is good parenting to set limits.

"The internet can be a great resource, but it can also be the wild west for children. We wouldn't think it was OK to drop our children off in the park at night if they were younger," she says. 

"In the same way we shouldn't think it is OK for them to roam the internet without any guidance or restrictions." 

There are disadvantages with these latest filtering devices, though. Some don't work once your child's phone leaves the home and is no longer on home wi-fi. And they won't all work if the wi-fi is switched off and the internet is accessed via mobile data. Other products are also incompatible with some UK routers.

Source: https://www.bbc.com/news/business-47853554(adapted) Access: APRIL 18th,,2019 

What is Alzheimer’s disease?

There are many types and causes of dementia, but Alzheimer’s disease is the most common form, accounting for between 60 and 70 per cent of all cases.  

Common early symptoms of Alzheimer’s include short-term memory loss, apathy and depressed mood, but these symptoms are often just seen as being a part of normal ageing, making early diagnosis difficult. 

Doctors diagnose Alzheimer’s on the basis of medical examination, patient history and cognitive tests, and can use imaging to rule out other forms of dementia. However, a definitive diagnosis of Alzheimer’s is only possible after death, when examination of brain tissue can reveal whether a person had the deposits of amyloid and tau proteins that are characteristic of the condition. 

            Source http://advances.sciencemag.org/content/5/1/eaau3333(adapted)

            Journal reference: Science Advances, DOI: 10.1126/sciadv.aau3333

            This article was updated on 30 January 2019 to add more detail and comment

            Access: April 20th, 2019

Planet’s ocean-plastics problem detailed in 60-year data set

Researchers find evidence of rising plastic pollution in an accidental source: log books for planktonmonitoring instruments. Matthew Warren 

Scientists have uncovered the first strong evidence that the amount of plastic polluting the oceans has risen vastly in recent decades — by analysing 60 years of log books for plankton-tracking vessels. 

Data recorded by instruments known as continuous plankton recorders (CPRs) — which ships have collectively towed millions of kilometres across the Atlantic Ocean — show that the trackers have become entangled in large plastic objects, such as bags and fishing lines, roughly three times more often since 2000 than in preceding decades.

This is the first time that researchers have demonstrated the rise in ocean plastics using a single, longterm data set, says Erik van Sebille, an oceanographer at Utrecht University in the Netherlands. “I’m excited that this has been finally done,” he says. The analysis was published on 16 April in Nature Communications. 

 Although the findings are unsurprising, long-term data on ocean plastics had been scant: previous studies looked mainly at the ingestion of plastic by sea creatures over shorter timescales, the researchers say.

Fishing for data

CPRs are torpedo-like devices that have been used since 1931 to survey plankton populations, by filtering the organisms from the water using bands of silk. Today, volunteer ships such as ferries and container ships tow a fleet of CPRs around the world’s oceans. 

(…)Each time a ship tows a CPR, the crew fills in a log book and notes any problems with the device. So Ostle and her colleagues looked through all tow logs from the North Atlantic between 1957 and 2016, to determine whether plastic entanglements have become more common.

Evidence analysis

(…)Van Sebille says that because the study focused on large plastic items, it doesn’t reveal much about the quantity of microplastics — fragments fewer than 5 millimetres long — in the oceans. These tiny contaminants come from sources such as disposable plastic packaging, rather than from fishing gear.

Nevertheless, he adds, the study demonstrates that fisheries play a major part in plastic pollution, and will provide useful baseline data for tracking whether policy changes affect the levels of plastic in the oceans. “As fisheries become more professional, especially in the North Sea, hopefully we might see a decrease,” he says.

Source: https://www.nature.com/articles/d41586-019-01252-0 (adapted).

Access: April 20th, 2019