Getting help with Math problems

Posted by: admin  :  Category: Internet

In these days of ever-increasing demand for knowledge, it has become more than obvious that education is of keen importance, in all aspects of our lives and especially in teens who are “creating” themselves and their place in society. That is why they must try to get education on all subjects, in order to get a complete understanding of history, Math, Sciences, etc.

Education, however, should not be misunderstood as the act of taking formal courses, where students sit, listen and then go home with all the knowledge already grasped. It takes effort to understand and assimilate all the information we receive at school and that’s when problems begin.

One of the subjects that students should really focus on is Mathematics, as it has deep implications on the understanding of many other subjects. However, many people feel lost when it comes to learning Math. Fractions and Algebra and the ability to solve Math problems can haunt many of us, if we don’t take matter into our own hands and get some Math help.

One of the simplest ways of doing this is by taking online courses, where students can get Math help whenever they want, 24×7.  If you are having problems with the subjects at school, there is a way.  TutorVista is the one that I’d recommend, based on its online reputation and on my experience with the site. Use this online service as much as you want. It can be very useful when you need Homework help and really need those “A’s”.

What’s best, you don’t have to risk a dime. If you need Algebra help,  you can get Free algebra help (free for first-time users),  where you can try their service without spending money. Who knows? It might give you the push you need to get your homework done (and perhaps, some awards?).

Another Beyond CMOS Candidate

Posted by: admin  :  Category: Technology
H. J. De Los Santos is with NanoMEMS Research and they have proposed a new beyond CMOS computer architecture called Nano-electron-fluidic logic.

Theory of Nano-Electron-Fluidic Logic (NFL): A New Digital “Electronics” Concept

A new digital “electronics” concept is introduced. The concept, called nano-electron-fluidic logic (NFL), is based on the generation, propagation and manipulation of plasmons in a two-dimensional electron gas behaving as an electron fluid. NFL gates are projected to exhibit femtojoule power dissipations and femtosecond switching speeds at finite temperatures. NFL represents a paradigm shift in digital technology, and is poised as a strong candidate for “beyond- CMOS” digital logic.

* Operates with far less heat and more efficient energies (femtojoules)
* Faster switching speeds (femtosecond)
* higher density potential for devices
* Terahertz operating speeds for chips
* Propogation velocity of electron fluid is hundreds of times faster than electrons in current CMOS
* Device construction is compatible with current lithography

Nano-Electron Fluidic Logic (NFL) Device patent application 2009026764

A nano-electron fluidic logic (NFL) device for controlling launching and propagation of at least one surface plasma wave (SPW) is disclosed. The NFL device comprises a metallic gate patterned with a plurality of terminals at which SPWs may be launched and a plurality of drain terminals at which the SPWs may be detected. A wave guiding structure such as a 2 DEG EF facilitates propagation of the SPW within the structure so as to scatter/steer the SPW in a direction different from a pre-scattering direction. A bias SPW is excited by an application of a control SPW with a momentum vector at an angle to the bias SPW and a control current with a wavevector which scatters the bias SPW in the direction of at least one output SPW, towards a drain terminal. The NFL device being rendered with device speed as a function of SPW propagation velocity.

* speed of the device is a function of SPW propagation velocity in terahertz switching frequencies.

A previous paper from 2004 by Héctor J. De Los Santos: NanoMEMS SYSTEMS ON CHIP

NanoMEMS exploits the convergence between nanotechnology and microelectromechanical systems (MEMS) brought about by advances in the ability to fabricate nanometer-scale electronic and mechanical device structures. While the “nano” aspect of this field is in its infancy, and is not expected to reach maturity until well into the 21st century, its “MEMS” aspect is a topic of much current and near-term impact in, for instance, RF/Wireless communications. In this context, we discuss the fundamentals of NanoMEMS, in particular, as it relates to its most speculative and futuristic paradigms and applications, and then focus on the RF/Wireless MEMS aspect, specifically in its role as enabler of ubiquitous wireless connectivity.

 

 


Legislative update – Sept. 2009 — REACH, RoHS2

Posted by: admin  :  Category: Semiconductor Industry
Guest post by Gary Nevison, Farnell

Summary
The legal obligations within the REACH Regulations and the potential impact of the so called “RoHS2” proposals dominate the legislative scene at present. Also, obligations are starting to filter through as part of the eco design/energy using Products Directive that monitors energy efficiency throughout a products life cycle. Going-forward, the scope of this directive will become more diverse to encompass energy related products.

Industry, and the design engineer, needs to be aware of developments and the potential impact on their companies.

REACH
Regulation 1907/2006, the Regulation, Evaluation, Authorisation -and restriction-of Chemicals (REACH) entered into force on 1 June 2007 after almost 8 years of debate and covering some 849 pages of regulation.

The only census on chemicals, taken in 1981, highlighted that 100,106 substances were placed on the market. Of those used, manufactured or imported at levels of 1000 tonnes or more, 21 percent had no safety data at all while a further 65 percent provided insufficient safe use data. Only 3 percent had been fully tested.

At the same time, instances of allergies, asthma, certain types of cancer and reproductive disorders were on the increase in Europe. Skin diseases alone resulted in the loss of 3 million working days per year.

Driven by the obligatory flow of safety data throughout the supply chain, REACH seeks to provide protection to health and the environment.

The biggest challenge to industry to date has been around the collection of data advising where a so called Substance of Very High Concern (SVHC) is present in a product, known as an article in the regulations, at a level of 0.1% by weight of the total article.

As a minimum obligation the name of the substance along with supporting safe use data must flow downstream through the supply chain.

Substances that are categorised as SVHC include those that are carcinogenic, mutagenic or toxic for reproduction. Also, substances that are persistent, liable to bio-accumulate and toxic, and finally “others” such as endocrine disrupters that can have a particular impact on aquatic life.

Back in October 2008, the first batch of 15 substances of very high concern was published by the European Chemicals Agency and, the following January, seven of these were earmarked for a consultation on whether or not they should be subject to a very costly “authorisation of use” requirement. These seven were approved and the European Commission will determine the date when these will be added to Annex XIV.

These obligations will then enter into force some 42-48 months later on what is known as the sunset date. Where such an authorisation is approved, downstream users can only use these substances for the use that they have been authorised for and they can only be purchased from the company granted the authorisation.

The REACH data collection has resulted in the circulation of hundreds of “standard letters” in a multitude of formats. Many manufacturers have refused to reply to the ad-hoc requests they receive preferring to promote websites or central databases (these have been slow to develop).

Guidance on the regulation encourages a more pro-active approach rather than simply providing a link to a website. Likewise, there have been many random requests for information that is not obligatory such as pre-registration details and RoHS style certificates of compliance.

Future batches of SVHCs will be published on an on-going basis, with the next expected early 2010, so REACH will not be a box that can be ticked as complete for several years to come.

“RoHS2”
Looking back the Restriction of Hazardous Substances (RoHS) Directive 2002/95 entered into force on 1 July 2006. It featured six restricted substances across eight broad categories of product pulled from the 10 categories in the Waste Electrical and Electronic Equipment (WEEE) Directive. There were 29 exemptions to assist manufacturers and design engineers where no viable alternative was available and a whole raft of “grey” definitions that required clarity.

“RoHS2” proposals look to move the directive forward and provide greater clarity. However, some of its provisions will potentially have cost and resource issues for industry.

The proposals recommend that the two remaining categories from the original WEEE categories, namely medical devices and monitoring and control instruments be added to the scope from 2014 (in-vitro diagnostics from 2016 and industrial “test” equipment in 2017). These were originally omitted from the directive due to reliability concerns over the use of lead-free solder.

While there are no substances actually restricted under the proposals, four are recommended for priority assessment. Three plasticisers used in a variety of applications and a flame retardant may well be restricted. Ironically, the substances, BBP, DBP, DEHP and HBCDD are four of the seven subject to authorisation of use under the REACH Regulations.

The fate of these substances under RoHS will be open to consultation after the revised directive comes into scope sometime in 2011-2012. Either way, any restriction under RoHS will probably be sooner than under the REACH process and the analysis is unlikely to be done twice.

Under a separate review by European Commission consultants, 29 exemptions will continue under the proposals, many with amended wording for clarity, 6 will be withdrawn and one new one will be granted. These could come into force next year and that will be followed by a transposition period of, on average, 18 months allowing manufacturers the time to comply.

In addition, a further six exemptions were added in June 2009 that had been proposed a year earlier.

RoHS2 also clarifies definitions such as equipment within out of scope equipment, spare parts and military where the latter clearly does not include dual use equipment.

A standard, and rigid declaration of conformity appears in annex 7 and will replace the multitude of different certificates, statements and compliance documents under the original legislation.

There now appears to be no scope for qualifying statements such as “so far as we are aware” and “to the best of our knowledge”.

It is proposed that RoHS will become a CE mark directive placing responsibilities on manufacturers, importers and distributors. There are many requirements including building technical files and keeping for 10 years, ensuring products comply, that they are supplied with the CE mark and the manufacturer or importer is identified on the product. Sample testing should also be carried out where appropriate, and corrective action is undertaken where product is found to be non compliant.

Finally under the proposals, the broad product categories and list of indicative products move from the WEEE Directive and sit in annex 1 and 2 of the RoHS Directive.

The terminology “RoHS2” is unofficial and is used simply to highlight the proposed changes to the original directive.

Energy using Products
Directive 2005/32/EC, Energy using Products, entered into force on 11 August 2007.

The main aim is to monitor energy efficiency throughout the life cycle of a product from the mining of raw material right through to recycling at end-of-life.

The focus is clearly on the design phase of the product since it is considered that this is the determining stage affecting the resources used in a product.

The directive does not apply to means of transport (planes, cars etc) but, apart from this, the scope is deliberately broad covering, in principle, any product which when in use depends on, generates, transfers or measures energy (electricity, fossil fuel or renewable).

Obligations on manufacturers will result from a series of specific “implementing measures” the first of which was adopted in January 2009.

The criteria required before a product can be considered for assessment is that is that it must sell more than 200,000 units per year in the European Union, have a significant environmental impact and present considerable potential for improvement. The latter is important as the target is for a 20% improvement in energy efficiency by 2020.

During phase one, studies were commission on 20 broad product categories ranging from water heaters, televisions and lighting, through to imaging equipment and personal computers.

Beyond that, a further 17 categories have been highlighted from ovens and hobs, machine tools and air-conditioning equipment through to transformers and networking equipment.

Among the first obligations to come in to force were energy efficiency improvements covering standby and off-mode losses, simple converter boxes for digital television, external power supplies and office, street and domestic lighting.

However, the European Parliament has now adopted the European Commission’s (EC) proposal to widen the scope of the directive to include energy related products. Until now the Energy using Products Directive was limited to products that consume energy during use such as boilers, computers, televisions, industrial fans and light bulbs.

However, many products have an indirect impact on the energy in use such as water using devices, taps and showerheads for example, and double glazing windows or insulating material.

Improvement in design could clearly result in the significant saving of energy.

For example, water saving taps and shower heads reduce water consumption and therefore the amount of energy used for hot water.

Under the EuP Directive studies had to set requirements for individual products where, in fact, it is the performance of the whole system that often needs to be optimised not just a single component or products.

The new directive will repeal the existing 2005/32/EC.

Lunar lander, Space elevator and space towers progress

Posted by: admin  :  Category: Technology
Armadillo Aerospace have officially completed the 2009 Northrop Grumman Lunar Lander Challenge Level 2, on a rainy day at Caddo Mills, Texas

Level 2 requires the rocket to fly for 180 seconds before landing precisely on a simulated lunar surface constructed with craters and boulders. The minimum flight times are calculated so that the Level 2 mission closely simulates the power needed to perform a real descent from lunar orbit down to the surface of the Moon. First place is a prize of $1 million while second is $500,000.

Space Elevator Games Inching Ahead
Good progress is being made on the setup of a helicopter supported cable for the space elevator climbing/beaming contest.

I just spoke to Ben Shelef, CEO of the Spaceward Foundation and the driving force behind the Space Elevator Games. As I indicated in my previous post, Ben was coordinating another test of the Space Elevator ‘race course’ this weekend and he tells me that everything went as well as could have been hoped for. They didn’t do a full-height test on the helicopter (that will be about 5,000 feet), but they did do multiple ascents / descents of the helicopter and steel cable raceway up to 1,000 feet. All went well, everything remained under control.

This is great news and means that a second test, scheduled for sometime in the next couple of weeks can now take place. This will be a test of the system to it’s full, 5,000 foot height. If that works (and now we have great optimism that it will), then the Cliimber / Power-Beaming competition will be a “go”.

A Tall Tower Instead of a Space Elevator
A tall tower instead of a space elevator

Space tethers have been investigated widely as a means to provide easy access to space. However, the design and construction of such a device presents significant unsolved technological challenges. We propose an alternative approach to the construction of a space elevator that utilizes a free-standing core structure to provide access to near space regions and to reduce the cost of space launch. The structure is comprised of pneumatically inflated sections that are actively controlled and stabilized to balance external disturbances and support the structure. Such an approach avoids problems associated with a space tether including material strength constraints, the need for in-space construction, the fabrication of a cable at least 50,000 km in length, and the ageing and meteorite-damage effects associated with a thin tether or cable in Low Earth Orbit. An example structure constructed at 5 km altitude and extending to 20 km above sea level is described. The stability and control of the structure, methods for construction and its utility for space launch and other applications are discussed.

The Free standing space elevator paper is available here. (27 page pdf)

 
 


element14 invites engineers to ‘RoadTest’ new technologies

Posted by: admin  :  Category: Semiconductor Industry
UK: element14 has launched a RoadTest Group on its site, providing users the opportunity to trial and review the newest technologies from a variety of industryleading manufacturers. The initial offer is for 50 Freescale RD3803MMA7660FC evaluation kits and 5 Altera Niois II embedded evaluation kits.

element14 will continually update the RoadTest Group, in line with its continued commitment providing electronic design engineers with the latest innovations and new technologies.

Engineers interested in this complimentary offer can sign up to test the product of their choice at http://www.element-14.com/community/groups/roadtest through December 31, 2009. Importantly the group will also offer members a platform to discuss their own experiences with the products on test.

Freescales’ RD3803MMA7660FC is designed to provide the user with a complete out of the box experience to evaluate the MMA7660FC, a low power, 3-axis linear accelerometer with 12C digital output. The kit contains the evaluation board, plus the daughter board, PC application and corresponding device collateral.

Altera’s Cyclone III Edition Nios II kit is a feature-rich, low cost platform that provides a fast and simple hands-on way for embedded designers to assess the Nios II processor, SOPC Builder system design software and custom applications. The kit includes the Nios II Embedded Design Suite, a complete design suite for embedded software development, several tutorials and 10 design examples with full source code.

element14 will be leveraging the power of its Community to highlight the kits from Freescale and Altera, both of whom have their own interactive groups within the web 2.0 site.

element14 is a natural platform for this offering as the website creates a unique online environment, providing the global electronic design engineering community with a vast array of product data, design tools, technology information and the capabilities for public or private collaboration with peers and experts.

“Freescale is excited that the MMA7660 will be promoted in element14’s RoadTest Group, because it’s a great way to let design engineers test drive our new products,” said Michelle Kelsey, Marketing Manager, Inertial Sensors, Freescale.

“Freescale’s cost-effective, low-power MMA7660 accelerometer integrates a number of smart motion features such as orientation, shake and tap detection with auto wake-up/sleep detection, in a compact 3x3x0.9mm package.”