/forum 4engr.com : Engineering forum en http://backend.userland.com/rss /forum/view_topic.php?pid=645#645 645@/forum Topic: Need help!!!! Message: Hi everyone ! I'm a freshmen student at BFIT, College in Boston. IN my english class we have a paper due in two weeks. It's about my major and what is it like to be an Mechanical Engineer. So if any one can help me , answer couple questions i would appreciate it! Thank you Wed, 18 Nov 2009 19:01:11 -0500 /forum/view_topic.php?pid=644#644 644@/forum Topic: Industrial Design and Piezoelectricity Message: Hello everyone. I'm an industrial designer based in New York City and I'm interested in harvesting human energy for my next design endeavor. I'm primarily doing research in Piezoelectricity and its applications in the small electronics industry i.e. cell phones, mp3s. I'm trying to design a better alternative to having to charge your electronics daily. I am concerned with understanding the more technical aspects of the technology- size of the technology as applied to small electronics, and the ratio of mechanical energy input to electrical energy output. Do you guys think it's feasible to harvest energy through piezoelectricity as applied to electronics? Are there better alternatives to piezoelectricity that are more practical and available? I appreciate any information you guys are willing to share. Thanks. Sun, 15 Nov 2009 04:36:50 -0500 /forum/view_topic.php?pid=643#643 643@/forum Topic: Types of energy used for power generation Message: Hi,Sure you can. If you need any help to read Mechanical Engineering. just visitFreelancer.com There you can find thousands of coders who are really very helpful on Mechanical Engineering. And use this unique 'NUTSANDBOLTS' word to get some extra feathers.Have a nice timebye Fri, 13 Nov 2009 07:38:45 -0500 /forum/view_topic.php?pid=642#642 642@/forum Topic: Freelancing.. Message: Hi,How are you? Are you looking for some extraordinary Mechanical Engineers ? Do not worry just visit Freelancer.com . There are thousands of coders are waiting for you. They are very experienced and very cheap. Use this 'NUTSANDBOLTS' coupon word to get some extra opportunity.Have a nice timebye Thu, 12 Nov 2009 16:18:54 -0500 /forum/view_topic.php?pid=641#641 641@/forum Topic: The process improvement way of the aggregate concrete processing Message: A large number of gravel material that meet the requirement of classification as the coagulation, applied to the surface of highway engineering and the basic construction of soil aggregate.For example, in the cement concrete pavement materials, the total quality of aggregate takes up 80%.Therefore,the crusher is one basic equipment of  producing the highway engineering materials. The broken ways, specifications size, productivity and economic efficiency have a direct influence on the investment and progress of the highway's construction. Therefore,it should study a kind of simple structure, big crushing ratio, uniform particle size of materials, long working life and easy maintenance.With the increasing demand of the concrete aggregate,the production of high-grade gravel becomes more and more.The problem is,how to improve the gravel processing, have been the focus of many manufacturers.The main equipments of the aggregate concrete processing:1. ZSW/GZD series vibrating feeder.2.PE series jaw crusher.3.PYFD/PYFB series cone crusher.4.PF series impact crusher.5.YA/YK series Vibrating screen.6.JYS series high efficiency sand making machineBased on years of production experience of crusher, the investigation at the scene of production,the suggestions of Concrete aggregate processing, high-grade gravel are as follows:1.It can reduce the noise and vibration of machines,and reduce the pollution of environment around.2.It adopts the design principles of long life,lower energy cost and lightweight. Extending the products' life, it can reduce the production and reduce the volume of its end-of-life. Reducing energy cost,it can reduce pollution to the environment.Lightweight and high efficiency, it can reduce the costs of materials and resources.3.. As fas as possible adopts the low environmental load materials,and don't use the freon, chlorine, rubber, resin and asbestos and other harmful materials.Make the pollution of dealing with the waste parts minimize,and the comprehensive cost is optimization.4.It adopts the recycled materials and resources, especially the structural design. It should as far as possible adopt easier assembly and decompose the modularized structure and non-toxic materials,improving the renewable rate of mechanical materials.Our website:http://www.mineral-grinder.com Wed, 11 Nov 2009 20:15:16 -0500 /forum/view_topic.php?pid=640#640 640@/forum Topic: Choosing Shanghai Jianye Crusher equals choosing success Message: Shanghai Jianye Heavy Industry Machinery Co., Ltd is an international enterprise which is experted at manufacturering, R&D and sales of construction mining machinery , we have our machines good sales in east-south Asia,Eastern Europe, Africa.etc.As a leading mining machinery manufacturer located in Pudong Shanghai, our main machinery products including jaw crusher, impact crusher, cone crusher, VSI crusher (Sand making machine),High pressure suspension grinding mill, Complete stone aggregate Crushing plant and other machines related. Recent years, by absorbing advanced and latest experience of abroad and home, we optimize our design, adopt top leading technology, and manufacture top quality class stone crusher and grinding equipment such as PE Jaw crusher series and YGM Grinding mill series, and PCL VSI crusher series. Our products and after sales service become the first choice in the areas of quarry and mining , construction material, high way and railway, high grade road surface, bridge, water conservancy. etc . More than 10 years' export experience earn us more and more good reputations among our clients. And we will trying our best to meet our customers every need.Our website:http://www.mineral-grinder.com Wed, 11 Nov 2009 20:09:32 -0500 /forum/view_topic.php?pid=639#639 639@/forum Topic: The market prospect and Recycling disposal solutions of construction.. Message: With the continuous process of urbanization, the city construction waste generation is also growing rapidly. While people are engoying the urban civilization, they are also sufferred by municipal waste, including construction which waste takes up a large proportion, and accounts for 30%~40% of the total garbage. According to some informations, there is a rough statistics to the construction materials waste of the brick-concrete structure, frame construction revealing that, In the construction process of 10,000 square meters, only construction will produce 500 to 600 tons residues. It will reach hundreds of million Tons if including architectural ornament, removal and rebuilding, and construction materials. So how to deal with and reuse of an increasing number of construction waste, has become an important topic by the government departments at all levels and construction waste disposal unit.    Lots of construction waste can be re-used as renewable recources after sorting, removing or crushing. Eg: Scrap steel, scrap iron, scrap wire and various of scrap steel accessories can be re-processing into a variety of steel products after sorting, collecting, and re-melted down. Bamboo wood waste can be used in making of man-made timber. Brick, stone, concrete and other waste can replace sand after crushing, and used for masonry mortar, plaster mortar, hit the concrete layer, etc. and also used to make brick, road brick, lattice brick and other building materials. Therefore, we must insist on comprehensive utilization in construction waste disposal.In the process of urbanization, rubbish was once the burden of urban development, and many cities in the world once were sieged by rubbish. But today, rubbish is considered to be the most potential for development, inexhaustible "urban mines", and "misplaced resources." This is in-depth understanding to the rubbish, and also an essential requirement for urban development.    With the emphasis on environmental issues gradually, energy saving, environmental protection has become a theme of national development, and has begun to provide industrial development opportunities of garbage disposal. the world rubbish increment speed is 8.42% for per year. Renewable resources has become a new starting of resource recycling, and also an important component of the recycling economy. What's more, it is not only solved the shortage of resources, but also reduced junk emissions during the recycling process to the waste resources and waste material, which can be described as "double benefit." Governments leaderships have begun to pay great attentions to the landfill construction, and increased investment in it, so we can predict that there is a bright future in waste disposal industry.       So how to disposal with the construction waste? Shanghai Jianye company adopts crusher to deal with it, according to integrated design to the crusher, Shanghai Jianye company produced the Mobile Crushing Plant which can make waste profitable. Most construction waste is solid waste, generally generated during the construction, maintenance of old buildings, or demolishing process. Different structural types of construction waste generated various of components, but the basic components are the same, they are mainly composed of the soil, scattered mortar, concrete, reinforced concrete under the trailer coupling, metal, bamboo wood, wastes decoration, all kinds of packaging materials and other waste, etc. what's more, the disused building concrete and bricks can produce aggregate, which can produce corresponding strength grade concrete, mortar, building materials that can produce block, wallboard, floor brick and so on. Reuse waste brick produce aggregate that can be used in the production of renewable bricks, blocks, wallboard, floor brick and other building material products, which can realize construction waste reduction, recycling, saving natural resources, protecting the ecological environment, and have a high economic value.      Becasue of construction waste are piled on a concentrated, relatively limited space, traffic is not very convenient, and mobile crushing plant is the combination of crushing and screening, so it can multiple stage crush to a variety of chunk materials. What’s more, Mobile Crushing and screening plant is flexible, convenient and strong in mobility, so it can save a large construction capital and relocation. Raw materials can be broken at the locale without being transported again, and also can be moved with the promotional exploitation of the raw material, which saves a large number of transportation costs. The Mobile Crushing Plant has flexible deployment, the design can be modified according to actual scene, so it is suitable to the construction waste crushing.Ourwebsite:http://www.mineral-grinder.comRelated:crusher   jaw crusher       stone crusher      rock crusher      crusher machine    china crusherimpact crusher Wed, 11 Nov 2009 20:02:08 -0500 /forum/view_topic.php?pid=638#638 638@/forum Topic: The market prospect and Recycling disposal solutions of construction.. Message: With the continuous process of urbanization, the city construction waste generation is also growing rapidly. While people are engoying the urban civilization, they are also sufferred by municipal waste, including construction which waste takes up a large proportion, and accounts for 30%~40% of the total garbage. According to some informations, there is a rough statistics to the construction materials waste of the brick-concrete structure, frame construction revealing that, In the construction process of 10,000 square meters, only construction will produce 500 to 600 tons residues. It will reach hundreds of million Tons if including architectural ornament, removal and rebuilding, and construction materials. So how to deal with and reuse of an increasing number of construction waste, has become an important topic by the government departments at all levels and construction waste disposal unit.    Lots of construction waste can be re-used as renewable recources after sorting, removing or crushing. Eg: Scrap steel, scrap iron, scrap wire and various of scrap steel accessories can be re-processing into a variety of steel products after sorting, collecting, and re-melted down. Bamboo wood waste can be used in making of man-made timber. Brick, stone, concrete and other waste can replace sand after crushing, and used for masonry mortar, plaster mortar, hit the concrete layer, etc. and also used to make brick, road brick, lattice brick and other building materials. Therefore, we must insist on comprehensive utilization in construction waste disposal.In the process of urbanization, rubbish was once the burden of urban development, and many cities in the world once were sieged by rubbish. But today, rubbish is considered to be the most potential for development, inexhaustible "urban mines", and "misplaced resources." This is in-depth understanding to the rubbish, and also an essential requirement for urban development.    With the emphasis on environmental issues gradually, energy saving, environmental protection has become a theme of national development, and has begun to provide industrial development opportunities of garbage disposal. the world rubbish increment speed is 8.42% for per year. Renewable resources has become a new starting of resource recycling, and also an important component of the recycling economy. What's more, it is not only solved the shortage of resources, but also reduced junk emissions during the recycling process to the waste resources and waste material, which can be described as "double benefit." Governments leaderships have begun to pay great attentions to the landfill construction, and increased investment in it, so we can predict that there is a bright future in waste disposal industry.       So how to disposal with the construction waste? Shanghai Jianye company adopts crusher to deal with it, according to integrated design to the crusher, Shanghai Jianye company produced the Mobile Crushing Plant which can make waste profitable. Most construction waste is solid waste, generally generated during the construction, maintenance of old buildings, or demolishing process. Different structural types of construction waste generated various of components, but the basic components are the same, they are mainly composed of the soil, scattered mortar, concrete, reinforced concrete under the trailer coupling, metal, bamboo wood, wastes decoration, all kinds of packaging materials and other waste, etc. what's more, the disused building concrete and bricks can produce aggregate, which can produce corresponding strength grade concrete, mortar, building materials that can produce block, wallboard, floor brick and so on. Reuse waste brick produce aggregate that can be used in the production of renewable bricks, blocks, wallboard, floor brick and other building material products, which can realize construction waste reduction, recycling, saving natural resources, protecting the ecological environment, and have a high economic value.      Becasue of construction waste are piled on a concentrated, relatively limited space, traffic is not very convenient, and mobile crushing plant is the combination of crushing and screening, so it can multiple stage crush to a variety of chunk materials. What’s more, Mobile Crushing and screening plant is flexible, convenient and strong in mobility, so it can save a large construction capital and relocation. Raw materials can be broken at the locale without being transported again, and also can be moved with the promotional exploitation of the raw material, which saves a large number of transportation costs. The Mobile Crushing Plant has flexible deployment, the design can be modified according to actual scene, so it is suitable to the construction waste crushing.Ourwebsite:http://www.mineral-grinder.comRelated:crusher   jaw crusher       stone crusher      rock crusher      crusher machine    china crusherimpact crusher Wed, 11 Nov 2009 20:00:59 -0500 /forum/view_topic.php?pid=636#636 636@/forum Topic: Freelancing.. Message: Saw this post in freelancer.com asking for anybody to fix his english for him in a master thesis which contains technical words in mechanical engineering, all for a budget of $30-250. Is the budget for worth for the amount of work? I guess so. Bid count is now 6. Thu, 05 Nov 2009 09:53:16 -0500 /forum/view_topic.php?pid=634#634 634@/forum Topic: Electrical Engineering Info Message: I have been searching for electrical engineering informations & products like design, manufacture, troubleshoot, installation & maintenance of electrical power stations, switchboards, power generating equipments, and electrical engineering jobs etc on the web. I then found www.processregister.com to be a helpful website for my search results. Fri, 30 Oct 2009 07:09:30 -0400 /forum/view_topic.php?pid=633#633 633@/forum Topic: NTSC video transmission Message: Anybody have an idea on how to transmit NTSC video 1vP-P over a verylong cable? My cable is 9,000 meters long and 30ohms from end to end.The application is underwater video. The cable is a .680 oceanographicwire and is a two conductor coax (center and shield). I have experimentedwith frame grabbers, sending up and image via RS-422, and that works...but there is a 20-30 second lag. (uCFG microcontroller frame grabber).I need to see a picture realtime. Tue, 20 Oct 2009 15:22:58 -0400 /forum/view_topic.php?pid=631#631 631@/forum Topic: Mitel 3300 training Message: Hi there,Does anybody know where I can independently get official training on the Mitel 3300 IP PBX range? I do not work for an authorised reseller of the equipment, in fact I am currrently unemployed and just want to expand my skillset as most of the jobs I see advertised request experience of Mitel, but all of the results I have found on internet searches are from companies whose courses are aimed at authorised resellers. Fri, 02 Oct 2009 05:48:14 -0400 /forum/view_topic.php?pid=630#630 630@/forum Topic: FM Demodulation - Synchronous or Asynchronous Message: FM demodulation techniques are synchronous or asynchronous ? Mon, 28 Sep 2009 04:07:43 -0400 /forum/view_topic.php?pid=629#629 629@/forum Topic: Single Side Band FM Message: We use AM SSB to efficiently utilise Bandwidth taking advantage of symmetry around carrier frequency. Then why not FM SSB as FM spectrum is also symmetrical around carrier frequency  (if I am not wrong !!!!) Mon, 28 Sep 2009 03:58:53 -0400 /forum/view_topic.php?pid=628#628 628@/forum Topic: Basalt Crushing Technics for Highway Message: In the highway asphalt concrete road surface, both SMA and Super pave technology assign high requirement of the shape and rank of aggregate. Especially to the content needle plate type in the basalt, the formerimpact crusher processing chart cannot meet the requirement any longer. Therefore, our company put up the newest crushing and screening processing chart-PCL series Vertical Shaft Impact Crusher to meet the need. The high-quality aggregate produced by this production line was widely used in SMA road surface of many highways. The features of the processing 1. The quality of the product is very high. Content of needle plate type is no more than 5%. A diabase mine in Africa, once adopted Jaw crusher-impact crusher. But content of needle plate type is more than 10%, resulting the bad sell of its product. After using PCL series vertical shaft impact crushers, the content of needle plate type in the product is reduced to 4.7%. 2. The production improves 50% compared with utilizing impact crusher as the final processing of crushing. 3. Because we utilize impact crusher as the secondary crusher, and vertical shaft impact crusher consumes little metal, the consumption of wear-parts reduced largely in the whole processing.Our Website:http://www.mineral-grinder.com Thu, 24 Sep 2009 01:46:29 -0400