i guar these once you visit, you never forget it. i caught between transformation and exploitation between education and tradition between cosmopolitan flare and captivating wilderness. the portrait of a desert state full of contradictions. katara starts november 11th on d. w, enjoying the view, and come take a look at this tv highlight school every week in your in box. subscribe now. ah, noise is everywhere, and noise is making a sick. premise under all i can hear are the trans. we can sound proof as much as we like your voice. many people can't get away from the clamor is would

emission, i'd also like to see cheaper rental units making use of good solutions like pays. mm hm. come. the natural world can also inspire effective solutions. i can hear guns guns where we can really see here is that the entire bird is covered with down . and that also makes the system really quiet. all flies of our world has gotten too loud, but what can we do about it? again my dad and i called christian pop could be described as a noise whisper. he and his colleague honor the read won't to free cities from noise. they work on behalf of local authorities and property developers. dunker for thanks, that's now calibrated to p level,

etc. street noise in hamburg is part of daily life. more than 70 decibels of the norm. on the main roads, tens of thousands of residents were exposed to excessive noise levels, leaving here his stressful dilemma. now 2 article of the ball at the noise reverberated the vacant building lots. that means you can't sleep with the window open. if you want to stay healthy here, you only do have to keep the window shut. the sound pin shades deep between the rows of houses. noise is measured in decibels. the medical recommendations are a maximum of 65 decimals during the day and 55 at night. here it's 71. well beyond levels considered healthy that's because noise makes us sick too much noise leads to insomnia,

high blood pressure and cardiovascular disease. acoustics, expert christian pop, wants to help reduce noise levels on main roads. but in the 150. but in as far as noise goes, yet in the case of people who have less money to go to live in places where rents and property prices are lower, these people are stuck and can't get out on miss tried. i want to make their situation more bearable and also get that message across to policymakers in a way that understand to come on its ear after all. sessions hold the purse strings because it's experts are also helping to reduce the clamor at this junction. emerson will need to see if we can close this gap to quiet and things down in the rear courtyard of the building a discharge. looking out onto the street that just one day. they would really benefit resident photo. presumably the trees will have to go, but we'll managers, let's work out some castings. yes. ok. the noise reserve rates between 2

apartment blocks and the re court yard. for 30 years christian pop and his company lamp contour have been developing solutions for quite a life. his idea then gone to the floor plan of the adjacent building allows for it . we can erect a structure in betraying. that'll also incorporate apartments one apartments, the face, the interior courtyard, the quiet side to logins, either sound insulation and new apartments. cheer, noise prevention could deliver to benefits at once. christian pop is called in as a consultant to advise on similar problems elsewhere in series. for example, here, cargo trains rumble directly past times. how can these palmer blocks be protected from rail noise?

flats loud it will. yeah, very loud, a lot under his boss odd is an internationally recognized acoustics expert from siri. he's us christian pop for some help. now they're joining forces to fight the noise. zurich is a key transport hub. there's a lot of movement and lots of noise primarily in the industrial zone to the west of the city. hello. did you hear it as it? sure did. it was loud enough from there to there and all the way up until his 1st heart has been working for the count on a zurich for years. his job is to protect residents from rail noise and i'll do it again. oh, what i knew was surfaces. i see around here, those are surfaces to flash. they reflect, you can hear it. a cargo train is approaching soft and 2 passenger trains. yeah, that's crazy. other signs, almost within touching distance,

whom listen to how these low frequencies coming from this monster so close by, dominate the scene like a sy fy movie stain abashed. f, as in yes, it goes a low frequencies that can't be absorbed anywhere they reverberate along. these was invented and returned from behind like a store from the side that from the noise. and the minute every minute is the 17 meter train sides create waves of sound. it's like a wave puller mountains of noise coming through and building up again in this passage. i get even louder back there than they are hear loud noise is a registered, subjectively felicity, lighter sound, the more intrusive it's going to be more so at night when you're sleeping, then during the day building modifications may help you to but what about the trains themselves?

as it was adequately withdrawn, i must take a closer look at the source. yes. and there are many options there. the we'll track noise, for example, can really important as a nash. in other words, on the tracks i need to have wheels that are perfectly round tracks that are really smooth and drive systems that are well soundproofed, there's potential that out of and quieter trains are already a reality. and up in it, things are changing to when planes take off, the noise is deafening. but when an owl, if source silence, what are the al fly?

so slowly and quietly that his prey are taken completely by surprise. ross as a yonder in his colleague michelin here, want to know why otto is able to fly so quietly the, to work at the gym and aerospace center in branch like they're involved in a project to make planes quieter. and new inspiration comes from nature running in hunter life, an unseen a lot of holes marketing. i can't hear guns got what we can see very well here is that the entire bird is covered with down loud. it's really, really soft all over of the sound under the wings as well. went out and he's such a charmer, i'm from her. and then a here when he lets his feathers hang down like this on it. we can make out

a front edge structure with tiny little teeth. that's wouldn't be, that's something we aerodynamic engineers would call turbulence generators. it means we can fly extremely slowly and to prevent stall. and that also makes the system really quiet, outlined feathers and down. the researches are also particularly interested in the soft trailing edge of the als, when i sticking on a brush like edge research is try and softened the reassign of an airplane link. previous experiments with the surrounded edge like this, produced a similar effect. he'll evacuate kennedy that we're familiar with the serrated edge solution must come. what more can we expect from the brush hoffman? therefore, the advantage of the brush is that it's actually directly aligned with the direction of flow, which more or less, eliminates the edge. in the wind tunnel is blown over the prepared edge. it 14

meters per 2nd. the microphones record the exact points where noise is created on the wing. the difference between the wing with and without the brushes calculated in the monitoring lab colors make the noise differential visible bread. his lout, his in him any count what his foolish on and i had to come. what we're seeing here is the contour of the wing and on the rear edge, the source of the sound in the original, where we've not yet applied a bra shotzel. and now the difference when we apply the bratia, we should see a clear reduction. and indeed you see that everything that was read before has gone away, or in other words, we've significantly reduced this sound source. you can see it very clearly. the brush itself has been very effective. some of the brush on the wing edge reduces sound by a 3rd research breakthroughs like this brought to life in the hanging of the

aerospace center together with his team. professor delves is found way to apply the soft trailing edge principal to the landing flap of a plane wing. yet some via gallon toys this vice. now we've learned by softening the transition from trailing edge to free flow. we can reduce the sound. in this instance, we haven't used brushes, or other things, we've implemented it with a material that's permeable to air flow blessing natalie are sort of sponge, but made of metal that significantly reduces noise creation on this trailing edge. so as long as i found against, oddly enough, this modification alone reduces noise by 20 percent with the potential for much more across the entire plane. there are many coolies. an edge is to research is, can target islam, then via alamos, now we think if we took all the measures together, we'd reach between $4.00 and $5.00 decimals for the entire plane. i and that's

a considerable amount as a sean anesthetic ocean a plane taking off without moore's reduction. and in comparison, assimilated takeoff with all the juice measures. class a plains ah possible. ah, cargo trains are also extremely loud. the noise is making people in the middle, ryan valley sick. why can schmidt's nice on his wife brita? a sound proofing? the house? it again is shawn explain here. hello chair gail volume is really quite extreme here or mostly at night. when you get those ancient cargo trains going past that, squeak and rumbles, you know, it's really unpleasant. they said sit,

we're not gonna slide as i've had insomnia for years. when i'm lying awake in bed, all i can hear are the trains that we can sound proof as much as we like. it doesn't make any difference or your voice. boy part in the middle, ryan valley lies on the north south axis between rotterdam and genoa. the picturesque middle ryan valley is the eye of the needle on this rail. freight corridor every day, full 100 trains. speed through villages on both sides of the rhine, residence the demanding of 50 kilometer per hour. speed limit and night time, ban and quiet at freight trains nearly impossible targets for germany's national railway company. deutsch urban high speed, passenger trains run on the same tracks as the cargo trains. and freight volumes is set to increase its slope so called wister brighton provide some relief over the past 2 decades deutscher bond has invested 220000000 euros in retrofit. thanks to

the whisper break the running surfaces of the we'll stay smooth before that become rough with every break application. this means that the wheel and the track, the quieter train research is in switzerland are already a step ahead and developing innovations beyond the whisper break. here research is being carried out on the train. we'll the future with laces and computers using data from the actual will. research is designed digital models, simulations of new quiet wheels created on the computer. what acoustics expert christian pop is a frequent guest here. the project to develop

a new super train will is happening at a swiss lab known as emp. located music does the jaws it looks like a loud speak of it moves. and that's essentially what it is. what you starting with . we want to make models of the wheel vibrations that are as precise as possible. what's a base of up to now further development tended to follow the trial and error principle . and it was really time consuming on the basis of our models. we're aiming for precisely targeted optimization to be able to market the advantage of this purely virtual method. it helps researchers save time and money in their quest to invent the quiet train wheel of the future. mess. you can only measure what already exists level and we want to develop something that doesn't exist yet to see the vibrating . now, that's a disc, is it? yes. versus what if you put spokes on it? that's the molar. it certainly be better, but not as robust. good guy. yes,

there are a few other constraints that sure a spoke will would be better than a full surface deflection away from that yet. i'm sure we'll get there and we'll be back in 2 years with pleasure. before a stout wheel makes its way to the track, this much want to be done. but already there are effective ways to further reduce rail noise. the whisper break has been the standard for years in switzerland. but for some people here, that doesn't go far enough at this factory sight, just over the board room, the northern italian town of booster cicio, thousands of we'll set a service repaired and stored. here work is underway to further improve the interplay of wheel and brake solution. disc brakes for freight trains. director leonardo for go explains people toyota device. how does that work and left breaking

the carriages with the latest innovation. avelo nick, we've got a set of wheels, but with an access it has to disc brakes. honda there and the carriage brakes on these desks with the brake pads need the the blanks beleaguered. the described wheel is currently the best and above all the quietest available on the market. this is because the wheel isn't break on the trade by a brake block, but on the extra discs, this is jennifer on the wheels, keeping them smooth with disc brakes. noise is reduced by another 30 to 40 percent compared with the so called whisper break. the following simulation shows the audible difference between whisper and disparate the noise reduction is clear. refitting cargo trains, yet again, this time,

changing, whisper, brakes to disgrace would be the best solution right now. but it's expensive. hope from the e. u is needed and she'll all railway companies get on board, nor meet their high me. you will be she. this is only going to benefit the railway if we have a european solution by law. otherwise it'll just be nice and small scale, not a europe wide solution. and that's a shame of that this child disgrace, the quietest solution fits a day. that is, until the eventual development of the even quieter spoke. we'll come by the button behind us. the simplest nice cause to hamburg students to come up with a completely different approach to reducing noise is up a lift above the fish market, and it was always loud. come to british, i grew up in a village and i just wanted to st. the windows open and that didn't work full time

yet the fish market got on my nerves every sunday. while at hamburg technical university, the 2 worked on further developing a system to reduce noise and founded a starter full years ago from elling is an electrical engineer. he wants to make construction vehicles quieter for the people who work in them. his partner is c, e o. lucas hinkle. as grandma gloved. to invent his experiment with what's known as active noise cancellation. guns analog simply explained, we're cancelling out noise with counter noise. i imagine it is 2 waves in the ocean hitting each other, not at that precise point where they made a particular frequencies. it's quiet until their noise cancelling system and to

protect construction workers from noise without headphones. one of her baby usually cries now her 3rd exactly canal the um i guess its my lot critical to loudspeakers in each of the chambers. several microphones here on the surface behind the grid or that and on the reverse. and we've got the processing unit which calculates the noise reduction signal volition in milli seconds. the unhealthy noise is altered less industry in essentially way creating a quiet zone around here where the drivers left and right is are. and within this quiet zone, we're able to reduce low frequencies and since a little see on the system aims to juice noise by 50 percent which could make his life easier. michael shipment operates this kind of machinery . often 8 hours a day that the ears take a real beating on a evening, you're toast,

top floor. it's time to try out the device at a testing site for construction machinery. instruct that i'm run most reduction without head fights, which are practical on construction sites. wherein too often can result in ear infections. machine operator marco stigma, is going to test the prototype under normal conditions on, on. and then i just like you to go for it just do what you always do was did some nice big holes and use the bucket a bit. ok, we'll do about super of you go have fun. can the pounding ra produced by this 25 ton machine? really be cancelled out the answer at the push of a button at the moment. this is also the shot. so it switched off at the moment. you can hear

the muffled droning of the engine. i saw that as soon as you switch it on. that's why the droning has gone gone. you can still hear a bit of background noise, but this invasive droning that's gone. the sil, significantly quieter. ah, well, on monday you can hear the difference. that muffled droning? yes, that humming? that's exactly what we're trying for. the low frequencies under $500.00 hertz a canceled out because this machineworks at very low frequencies, the spherical radius is especially large at 30 centimeters. that means if you lean forward slightly, you should still feel in effect if you lean this far forward, you won't be able to hear it any more. if you lean back again, you'll notice how the frequencies gradually fall away

on better with or without the device. with the device you can leave it installed. great, and thank you very much. take care julian that we've been able to help the driver like that's not, that's exactly what we're aiming for. genuine feedback from the people who be using the device. the test was a success next to you, the to entrepreneurs plan to sell their 1st noise cancelling systems at $4000.00 euro apiece. what is the best solution for reducing traffic? noise is become a reality for christian pop, a residential noise berry at this major intersection in hamburg. because the expert and his colleague oliver rick assist the new glass wall. it closes off the corridor between the old and new buildings. the wall keeps

noise out in the interior court yard quiet or does face a special camera as a monitor. how well it works to your model. little one of them are coming up. let's see if we can capture it with the camera. oh yeah, we can hear it, especially when cars drive past the acoustic camera makes sound visible. it's used to test whether the wall is properly sealed. yellow and purple spots signal gaps in the sound barrier. the wall largely does its job with a few weeks spots. it chills the courtyard from noise coming from both main roads. here we're, we're this structure now stance on this side. that used to be the street with sidewalk parks and such. the older building was unprotected

of just far sir. the building on that street now protects this old buildings and these walls on create a tranquil in a courtyard. and so the noise barrier has also created living space. 62 tenants have moved in kitchens and bathrooms faced the road with living rooms, bedrooms at the rear a quiet time, even for those who live on land, city street, and can't afford a house in the country. that's one of christian pops main goals. so lancaster hasn't, i cares a lot with traffic as loud as we're experiencing it currently along as in depth. while we do have good solutions here on these are privately funded and not cheap. this chance. i'd also like to see cheaper rental units making use of good solutions, like these are, wouldn't rows on that for medical more piece at last,

something many people are looking for. then to make it happen there a whole host of innovative ideas. we can make the world a quieter place. ah ah ah ah, with

who is the end of the pandemic in site. we show what it could look like will return to normal. and we visit those who are finding it difficult

with successes, a weekly copays 19 special in 30 minutes on d w. what secrets lie behind these walls? discover new adventures in 360 degrees. and explore fascinating world heritage sites. d w world heritage is 316. get the app now closely. ah. listen carefully. don't know how to do it. go. ah, feel the magic discover the world around you

subscribe to d w documentary on youtube. mm hm . anyone ever man knows of the chinese food that food can do nothing. before movies, news can we had a lot of programs. they drop over this food because they were eating nothing when it came from home. that could have easily been us. any one of us here? ah,

ah, ah, ah ah, this is the w. news ly, from berlin. the 1st thing you, leader to visit china's since the pandemic broke out and the war in ukraine, germany's all af sholtes tries rekindling ties with begging, but other e. u officials frowned on the diplomatically delicate.