2 March 2007A team of South African students have won an international award for developing an online, cellphone version of the traditional African board game Morabaraba.David Vannucci, Teddy Mwakabaga and Rolan Christian from the University of the Witwatersrand’s school of electrical and information engineering received a silver medal for their entry, “Mobiraba”, at the SIMagine Awards in Barcelona last month.“Mobiraba the cellphone game was tested at the 2006 National Morabaraba Trials and received excellent reviews from experts,” said Professor Barry Dwolatzky, the team’s supervisor.Cellphone users can play Mobiraba online by logging on to a game server and chosing between two gaming options. A quick game allows the user to be automatically matched up against another quick game player of a similar skill level, while an organised games allows the user to send out invitations to a chosen opponent.The online server maintains the results of all the players, as well as rankings and a record of each game.Dwolatzky said the invention could be used to develop Morabaraba further in the country, as it would be possible to organise online tournaments. According to Dwolatzky, over 16-million South Africans play the game.“Players could play for communities and clubs in online Mobiraba forums and purchase additional game play credits by simply sending an SMS to a premium rated number,” he said.SIMagine awardsThe annual SIMagine awards, sponsored by SIM card manufacturer Gemalto, aim to stimulate the development of Java-based SIM card applications.The winner of this year’s event was a team from Poland who entered an application called SIMKey, which allows the user to replace all kinds of electronic keys with a single key stored on their cellphone.A Chinese team came in third with their entry “Google SIM”, which enables most of Google’s services – including e-mail, online messaging, calendars and maps – on a user’s SIM card.The competition drew more than 315 entries from companies and universities around the world, of which only eight were selected as finalists.“This is an honour for the School of Electrical and Information Engineering, the university, South Africa and the students,” said Dwolatzky. “They managed to beat competitors from countries with advanced software development and developed information systems.”Source: BuaNews
Editor’s Note: This post is one of a series by Chris Stratton and Wen Lee, a husband-and-wife team living in the Los Angeles area who are turning their 1963 suburban house into an all-electric, zero-net energy home. They chronicle their attempts at a low-carbon, low-cost, and joyful lifestyle on their blog Frugal Happy. This post was written by Chris. When considering what materials to use for the interior of the common area, we wanted at least one surface to have some character. Drywall is great in many ways. It’s durable, inexpensive, fire-resistant, versatile, and you can cover walls and ceilings quickly, especially if you know what you’re doing.RELATED ARTICLESReclaimed Wood is Beautiful and GreenSelling Reclaimed Snow Fence Boards For SidingUsing Reclaimed Wood for Porch DeckingThe ‘Wally’ Bed: Accessorizing with Salvage But drywall can be a little boring. When discussing this project at the outset with my construction-experienced friend Sunil, I asked him about using tongue-and-groove (T&G) pine paneling for the ceiling, and he suggested the possibility of using reclaimed flooring. At the time I tucked the idea away, since I was then far away from the interior ceiling surface stage and had no ready prospect of where to get reclaimed flooring. The first step is to salvage the wood Fast forward a year or so, and it was finally time to think about what to use for the ceiling. Wen asked around and discovered that her friend Henry from high school is now a real estate developer who would soon be gutting a home in a nearby city! I must say, Wen’s social capital really is incredible. We approached Henry asking if he would be removing the oak floor, and if so, could we salvage it? After checking with his contractor, he very generously agreed to let us take up the old flooring as long we cleaned up after ourselves and didn’t damage the subfloor. Deal! The salvaging process involved prying up each piece with small pry bars and a mini sledgehammer, assisted occasionally by an oscillating multitool for the more recalcitrant pieces. After the pieces were removed, all the nails had to be pulled out by hand. My brother-in-law Bin helped a lot with the harvesting. Even Wen came out for a day to do some labor! After the flooring was removed from its first home, it had to be prepped for its second. That included removing nails. [Image credit: Chris Stratton] I was very grateful, but was wondering why the developer was taking out a perfectly intact hardwood floor. We soon discovered one possible explanation: cats! In particular, cat pee. Some significant fraction — maybe 20% — of the pieces were saturated with cat urine and emanated its most distinctive odor. If we wanted our newly renovated ceiling not to smell like cat piss we would need to sort out the offending 20%. And that would have to be done by individually sniffing each redolent piece and determining its fate. Since my sense of smell is considerably better than Wen’s or Bin’s, the tedious olfactory task unenviably fell to me and my soon-saturated nostrils. Ew. [Note: the ceiling has been installed for several months now, and no hint of any cat smell. So “sniff sorting” was successful!] Estimating quantities We had to estimate how much wood we would need to cover the ceiling. It was important to have enough, because there would be some time between when we harvested the wood and when it would be used. If we underestimated, it might not be possible to get more wood, because it might not be available. To calculate the amount needed, I measured the area of the ceiling: about 600 square feet. I then determined how much each square foot of T&G flooring weighed: about 1.4 lbs. I then multiplied the two to determine the total weight needed: about 850 lb. I rounded up to 900 lb. to account for losses. It turns out I should have rounded up even more, to perhaps 1000 lb., but — oh well. The process of salvaging 900 lb. of wood needed took about 10 days spread over the course of three weeks. I almost always had a helper. It was a lot of work! Calculating the amount of flooring we had by weight: Each square foot weighed about 1.4 pounds. I weighed the wood in 25-pound bundles, and laid it out, marking each increment with blue masking tape. Soon much of the available floor and interior wall space of our house was covered in T&G flooring laid on end. Reclaimed oak flooring soon filled the living space. Preparing the flooring Now that we had the wood needed, we had to prep it. I wanted a light-colored ceiling and the flooring was stained a rather dark brown. I decided to remove the top layer of the wood to expose the natural oak color and then pre-finish it (as opposed to finishing it once it’s installed) with a clear varnish. But how do you efficiently remove the stain on 900 lb. of oak flooring? Any kind of manual sanding or planing would be out of the question. When I was at my friend John’s workshop some weeks earlier, I noticed that he had a self-feeding power planer. This tool came to mind as a potential solution to my problem. I asked John about borrowing his planer and he generously agreed, provided that I return it in the same condition I found it. Deal! Social capital to the rescue, yet again. By the way, southern California really needs to have a tool library for these kinds of expensive tools. They are really great to have when you need them, but you don’t need them very often and you can’t justify buying them or just can’t afford them. In the Bay Area, we lived between two such tool libraries (one in Oakland, one in Berkeley) and we used them all the time. Tool libraries should be everywhere! If you want to learn how to start your own, watch this video of a webinar that Wen helped organize. A piece of flooring before and after planing. We just fed the brown wood in one end of the planer and it magically came out a light natural oak color from the other. Even with a fancy planer, planing over 3800 linear feet of flooring took a long time, but it took much less time than it would have using almost any other method. After the flooring was planed, it needed to be varnished. This would be much easier to do before it was up on the ceiling, because gravity would be on our side. We laid the flooring outside on the patio and driveway and brushed on two coats of varnish. We initially tried using a paint sprayer, but the area we could spray at one time didn’t justify it, and we were going through the expensive varnish too quickly, so we just went back to the brush. Brushing varnish on the flooring while it was on the ground proved much easier than trying to finish it in place. Installing the ceiling Finally the prep work was done and it was time to begin installing our new oak ceiling. This T&G paneling has to be installed bottom to top, left to right, so that the tongue from the last piece would support the next piece. At first I tried installing a few partial rows at once in the same area, but soon found that to be unworkable because the lengths of the pieces varied. I ended up taking down those first few partial trial rows and switched instead to installing one complete row — all the way from the wall to the ridge — at a time. This worked much better, so this was how I proceeded from then on, even though it meant constantly moving the ladders and myself as the roof sloped upward. Each piece of paneling had to be tapped into place with a rubber mallet before being fastened to the 2×3-inch furring strips spaced every 2 feet. I used a pneumatic nailer to drive 16 gauge brads into the corner of the tongues at a 45(ish) degree angle. The pressure on the air compressor has to be set high enough that the brad head did not protrude at all once driven in, but not so high that the brad went all the way through the paneling. It’s crucial that the brad head not protrude, because it otherwise it will create an unsightly gap for the next row of paneling — and innumerable headaches. If everything goes smoothly, you’ll end up with a gap-less surface with no visible fasteners holding down (er, up) the paneling. This process is called “blind nailing.” I did a fair amount of the installation alone, but it was noticeably more than twice as fast when I had an assistant because it meant I didn’t have to climb up and down the ladders so often. Bin and our friend Sang helped out a lot with both the varnishing and the installation. We sorted all the salvaged pieces into four categories, depending on which of the T&G ends were still intact: tops, bottoms, middles, alternates. Each T&G piece is not supported just from the side by the previously installed row, but also from the piece below it. The bottom pieces went next to the walls, the tops went at the ridge, the middles went in between, and the alternate pieces were set aside in case we ran out. [Spoiler: we did run out and had to use them.] Installing the ceiling required a good deal of running up and down ladders. The major downside of the alternate pieces is that they have to end in the middle of a furring strip. The intact pieces (tops, bottoms, middles) can end in between furring strips because the tongue from the piece below supports them (keeping them from moving in and out relative to the plane of the ceiling). But alternate pieces, having neither the tongue nor the groove end intact, have to be supported from behind by one of the 2×3 furring strips. This meant every single alternate piece had to be custom cut to fall in the middle of a furring strip. What a pain in the ass. Because of several factors — the non-uniformity of the planing, the furring strips perhaps not being perfectly in the same plane, and the difficulty of working overhead — it was impossible to avoid some gaps in the paneling. By necessity, I began to regard these irregularities as a feature, not a bug. “It has character” became our refrain. This layer is not part of the thermal envelope, so it doesn’t have to be airtight, so gaps weren’t a functional problem either. Whether or not gaps are an aesthetic problem depends on your perspective. Gradually we started to get the hang of it and slowly the new ceiling began taking shape. Best of all, given the amount of effort involved, it looked pretty good! Eventually we got into a decent rhythm, and were installing up to 20 or so rows a day by the end. Below is a time lapse video of Sang and me. Finally we got to the last row and the ceiling was done. It was the end of a long journey. All told, the preparation and installation of the ceiling took about a month. A month! Conclusions Was it worth it? I suppose there are differing ways to think about the “worth” of using salvaged oak flooring for our ceiling. I definitely prefer the distinctive look of it to a drywall ceiling. A purchased pine T&G ceiling with wider, longer pieces would have gone up much more quickly and looked more uniform. The smaller, varied pieces of our ceiling give it its character, but they are also what made it so incredibly labor-intensive. It’s not perfectly uniform, but the ceiling has character, and it kept a lot of oak out of the landfill. From a broader perspective, surely there is some value to all of us collectively when we are able to repurpose perfectly functional oak flooring that would have otherwise gone to a landfill. The small stand of trees that would have been cut down to supply new paneling can instead keep doing their beautiful thing, regulating temperature, providing habitat, absorbing CO2, and releasing oxygen — in short, helping to keep us and other living creatures alive. A thing that helps keep us alive surely has value, right? What about from a strictly financial perspective? The price of lower end pre-finished T&G pine paneling is about $3/square foot, including tax and delivery. Our ceiling ended up at around 660 square feet, so materials cost would have been around $2,000. My approximation is that 135 person-hours were spent harvesting sorting, planing, and varnishing the wood. The zero VOC varnish that we used to seal the wood cost about $250. So at $1,750/135 person-hours, our time is valued at about $13/hour. If our time is worth more than that (and it definitely is), then it’s not a great deal. This number would decrease further if I factored in how much less time it would take to cover the same area with uniform 6-inch-wide pieces rather than non-uniform 2-inch-wide pieces. But, but! We’re not comparing it to a pine ceiling, we’re comparing it to an oak ceiling (something that no one in their right mind would install, but still!). That would make materials closer to $5/square foot, making our labor worth more like $22.50/hour. Still not great, but better. The return would have been marginally better had I used a cheaper varnish. Another point to consider: now I know how to salvage, prep, and install T&G flooring. What is acquiring that skill worth? In thinking about this I’m reminding myself of the priorities for the project I established at the beginning. The number-one priority was (and is) to learn, and in this case that goal was definitely achieved. I think it’s a beautiful ceiling. I’m glad we did it. I learned a ton in the process of salvaging, prepping, and installing the wood. But one of the things I learned is that I’m not sure if I would do this again. If I did do another salvaged floor-ceiling, at least I now have a good sense of what I’d be getting into. A footnote It’s been a few months now since we finished the ceiling, and other progress has been made on the space, including walls that have been sheetrocked and painted. Installing drywall was yet another learning curve for me, but I probably won’t do a dedicated write-up of that process. Suffice it to say that instead of the usual three-stage drywall process, mine was more like five or so. The end result looks fine, it just took me a long time. Noticing a trend? My great fear that our new ceiling would smell of cat piss has proven mercifully unfounded. And beyond that the end result turned out — dare I say it — lovely. It’s definitely quirky and eye-catching, and it’s nearly always the first thing people comment on when entering the space for the first time. I see its flaws, but I’m happy with it. Not a bad approach for life in general, I suppose. Other posts by Chris Stratton and Wen Lee An Introduction A Car-Free Experiment Demolition Our House Becomes a Giant Foam Box, Part 1 Giant Foam Box, Part 2 Let’s Kill the Lawn Vaulting the Ceiling Our First Year With Solar Panels Introducing the Share Shed
A few hours after Bangladesh Prime Minister Sheikh Hasina returned to her country, arrived another Hasina, in her middle years, with 58 others. They are all “stateless” and “persona non grata”, two phrases used by the police to describe Ms. Hasina and her compatriots. They are all “Bangladeshi citizens”, said the officials escorting the group of 59 from Bengaluru to Howrah Railway Station, a journey of about 36 hours.Ms. Hasina did not deny that she was from the neighbouring country, and had been living for many years in Bengaluru, working as a rag picker. “I am from Bagherhat in Khulna,” said Ms. Hasina, surrounded by at least 20 women and about a dozen children, a few as young as three, mostly from Bagherhat. “We were working in Bangalore for four years and used to earn about [₹] four to five thousand a month,” she said. Another woman, in her twenties, said: “[We] even have Aadhar card.” Karnataka Police was in a quandary with the group, which is the largest in recent years to be brought to Bengal from southern India.‘Awaiting orders’“We do not know what to do with them. We are awaiting orders,” said Guruprasad, the Sub-Inspector leading a team of 28 Karnataka Police personnel late on Saturday. Later, the children and women were shifted to a hotel in the Howrah district, monitored by the Railway Police under the State Police. The group, whose citizenship is yet to be ascertained, acknowledged that the Karnataka Police had treated them “very well”.“They gave us good food, tea, plus snacks,” said Komal Mistry, the only Hindu among the 58 Muslims. Mr. Mistry, also in his 60s, had a story. His family, wife, son, daughter-in-law and brothers were all settled in either Nadia or North 24 Paraganas district of south Bengal. “But I stayed in Bangladesh, as I decided not to leave my father’s land,” he said, sobbing. He had been working as a waste seggregator for four years in Bengaluru, and his son did not come to his rescue fearing his own arrest, Mr. Mistry, a member of Matua sect, said. “We were arrested about a month back and kept in a police station in Bangalore,” he added. ‘Pushback’ begunA senior official of the Railway Police said they were “awaiting orders” to deal with the situation. The Bangladesh Deputy High Commission in Kolkata has not been intimated by the State or Central government. Civil rights activists, however, claimed that the “process of ‘pushback’ has already begun” on Sunday. Why the government is transferring alleged immigrants to Bengal remains a question — two other batches reportedly arrived before this one.