Questões Militares

         Chagas disease, also known as American trypanosomiasis, is a potentially life-threatening illness caused by the protozoan parasite Trypanosoma cruzi. About 6-7 million people worldwide are estimated to be infected with T. cruzi. The disease is found mainly in endemic areas of 21 continental Latin American countries, where it has been mostly transmitted to humans and other mammals by contact with feces or urine of triatomine bugs (vector-borne), known as kissing bugs, among many other popular names, depending on the geographical area.

        Chagas disease is named after Carlos Ribeiro Justiniano Chagas, a Brazilian physician and researcher who discovered the disease in 1909. Chagas disease was once entirely confined to continental rural areas of the Region of the Americas (excluding the Caribbean islands). Due to increased population mobility over previous decades, most infected people now live in urban settings and the infection has been increasingly detected in the United States of America, Canada, and many European and some African, Eastern Mediterranean and Western Pacific countries.

           Chagas disease’s transmission is caused by T. cruzi parasites, which are mainly transmitted by contact with feces/urine of infected blood-sucking triatomine bugs. Normally they hide during the day and become active at night when they feed on animal blood, including human blood. They usually bite an exposed area of skin such as the face (hence its common name, kissing bug), and the bug defecates or urinates close to the bite. The parasites enter the body when the person instinctively smears the bug’s feces or urine into the bite, other skin breaks, the eyes, or the mouth. T. cruzi can also be transmitted by consumption of food or beverages contaminated with T. cruzi through, for example, contact with feces or urine of infected triatomine bugs or common opossums. This kind of transmission typically causes outbreaks with more severe cases and mortality; passage from an infected mother to her newborn during pregnancy or childbirth; blood or blood product transfusion from infected donors; some organ transplants using organs from infected donors; and laboratory accidents.

Internet: <who.int>  (adapted). 

    No one enjoys a delayed flight, but as our weather gets warmer, we can expect more of them.

   That's according to experts, who say that the heat of the summer might cause more delays.

    Bloomberg looked at US data for flight delays at airports in Chicago and New York from June to August in 2022 and from January to March in 2023. It found that there were more delayed flights in the summer months at both airports.

    When the temperature rises above 39 degrees Celsius, things get very difficult for airlines, Bijan Vasigh, a professor at Embry-Riddle Aeronautical University in the US, told Bloomberg.

    The air is thinner when it gets hot and that makes it harder for planes to take off. In thinner air there is not as much lift, so more power is needed.

     When they need more power, it helps to have a lighter airplane.

    That might mean pilots have to make last-minute decisions to reduce the weight on board by dumping fuel, passengers or baggage — meaning the plane will probably be delayed.

    The problem gets worse at airports that are at a higher altitude where the air is already thinner, and at airports with short runways, since planes need more space to get up to a high speed.

   But thin air is not the only problem. Smoke from wildfires — that have been happening all around the world in the summer of 2023 —can also cause flights to be delayed and canceled.

    Of course, the summer is also a busy time when millions of people fly, and weather is not the only cause of delays — but our hotter climate doesn't seem to be helping.

Internet: Engoo

     Fricatives are consonants with the characteristic that air escapes through a narrow passage and makes a hissing sound. The dental fricatives are sometimes described as if the tongue were placed between the front teeth, and it is common for teachers to make their students do this when they are trying to teach them the sound. The thing is, however, that the tongue is normally placed behind the teeth; the air escapes through the gaps between the tongue and the teeth. There is a distiction between fortis (unvoiced) fricatives, as in the word “thin”, and lenis (voiced) fricatives, as in “thus”. (Roach 2003)

(Mark Roach,. English Phonetics and Phonology.

Cambridge: CUP, 2003. Adaptado)

        Most teachers recognise the need for the students’ awareness about the potential relevance and utility of the language and skills they are teaching. And researchers have confirmed the importance of this need.

        In ESP (English for specific purposes) materials, for example, it is relatively easy to convince the learners that the teaching points are relevant and useful by relating them to known learner interests and to ‘real-life’ tasks, which the learners need or might need to perform in the target language. In general English materials this is obviously more difficult; but it can be achieved by researching what the target learners are interested in and what they really want to learn the language for. An interesting example of such research was a questionnaire in Namibia which revealed that two of the most important reasons for secondary school students to wish to learn English were so they would be able to write love letters in English and so that they would be able to write letters of complaint for villagers to the village headman and from the village headman to local authorities.

        Perception of relevance and utility can also be achieved by relating teaching points to challenging classroom tasks and by presenting them in ways which could facilitate the achievement of the task outcomes desired by the learners. The ‘new’ learning points are not relevant and useful because they will help the learners to achieve longterm academic or career objectives, but because they could help the learners to achieve short-term task objectives now. Of course, this only works if the tasks are begun first and the teaching is then provided in response to discovered needs. This is much more difficult for the materials writer than the conventional approach of teaching a predetermined point first and then getting the learners to practise and then produce it.