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4/10/2009 • Kategori: Bitkiler

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34- TRACERCO Diagnostics

6/3/2009 • Kategori: Teknoloji

Do you want an installed method of regularly assessing the operation of your distillation tower, reducing operating costs and reducing shutdown time?

To meet the changing needs of our customers the Tracerco research and development team has designed an alternative technique to conventional tower scanning. The TRACERCO Diagnostics™ RapidScan technology combines sophisticated wireless detector capability with an easy to install permanent scanning guide wire system.

The TRACERCO Diagnostics™ Tower Scan method has been used for over 20 years by many major chemical and refining companies around the world. The combined data acquisition software from these techniques coupled with TRACERCO Diagnostics™ RapidScan hardware increases efficiency and reliability of scan data by providing fast, consistent data acquisition from fixed orientations. The service allows repeatable tower scanning that can quickly evaluate mechanical or process related problems offering plant personnel a cost effective process diagnostics solution to optimize or troubleshoot tower performance. Even columns with limited or zero ladder access do not pose an obstacle following installation of a TRACERCO Diagnostics™ RapidScan system.

  • Improved Accuracy - the scans will use a fixed orientation so repeat scans are guaranteed to utilise identical geometries
  • Better Data Reliability – data will not be affected by weather conditions (wind)
  • Increased Safety – all scanning operations will be from ground level with no need to climb the tower, eliminating workingfrom heights
  • Greater Cost Savings – after initial setup, the high costs of scaffolding or cranes for columns that have inadequate or no access is eliminated
  • Enhanced Efficiency – reduces time needed to conduct a scan lessening the burden on operations to hold column at set conditions

The capabilities of conventional tower scanning are not lost. In fact, the TRACERCO Diagnostics™ RapidScan system potentially improves our ability to diagnose more subtle process changes by stringently controlling and eliminating variability in scan line orientations and paths.

Features Identified

  • Tray damage
  • Liquid maldistribution/blockages in packed beds
  • Tray liquid loading
  • Jet and liquid stack flooding
  • Packing damage
  • Distributor performance
  • Presence and density of foam

All of the stainless steel pulleys and bracket work will be attached to the existing structure using insulation bands utilising the ‘band-it’ system. No welding or direct attachment to the column walls is required; hence the vessel pressure envelope will not be affected.

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33- High Flow Range Mass Coriolis Flow Meter

23/2/2009 • Kategori: Teknoloji



Ideal for the measurement of flow, density and temperature of liquids and slurries, such as aggressive or contaminated, sanitary or particle-filled fluids.

Features:

  • Flow ranges from 60 to 
    60K Kg/Hr (2.2 to 1650 lb/min) 
  • Accuracy up to 0.25% of reading
  • Materials: flow tubes -
    316 L, splitter flanges -
    316 Ti, housing - cast iron
  • Process temperature
    -40°F to 356°F
     
  • Ambient temperature
    -40°F to 140°F
  • Wide flow ranges
ACCURATE AND RELIABLE
This meter has the ability to
maintain high accuracy,
despite changing
viscosity conditions, with accuracy of +0.25% of reading.
 
EASY CLEANING
The ACM series has smooth stainless steel tubes and no moving parts, and is therefore very easy to flush and clean.
 
MULTI-TASKING
The ACM series of mass coriolis flow meters measure flow, density and temperature.
 
MATERIAL COMPATIBILITY
Because of the meter's 316 stainless steel flow tubes, the ACM series can measure a wide range of materials.
 
VARIETY OF ELECTRONICS
Electronics available for the ACM series include a local, hazardous rated display and a remote, panel-mount digital display.

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32- FOREX EDUCATION | FOREX TRAINING

23/2/2009 • Kategori: Faydali Bilgiler

Do you have what it takes to become a successful Forex Trader?Forex trading, or any trading for that matter, is an occupation that requires experience and the accumulation of proficiency not unlike any other highly skilled profession. Whether you are a leading executive at a major publically traded company, a professional golfer or trading from your kitchen table, there are 5 key ingredients that one must possess in order to become successful.1. You must be Passionate about what you do.As Forex traders we all face one unique set of circumstances that does not exist in any other profession. We get rewarded for when we succeed and equally punished when we don’t! Could you image a corporate worker ne quarter receiving a significant accomplishment bonus and the next quarter actually getting  money taken from their paycheck for missing performance targets? Not on your life!We do as Forex traders and that is why passion for what you do will carry you through the tough times that are part of your trading business. Asked yourself why you trade currencies and would you still do it if Forex were not potentially lucrative? Your answers will be quite revealing. You’ve got to feel your passion for trading!2. You have to Apply Yourself and work hard at it.I talk to so many people that enter into Forex trading with the aspiration of getting rich quick. Without putting the time and energy into really getting good at trading I see them jump from strategy to strategy looking for the goose that will lay the golden egg and eventually quitting while blaming everything else, except the true cause.I got news for you you are the goose and your Forex education is the golden egg. The magic has always resided with the magician and not some strategy. Work hard at trading and the rewards will ventually come your way. Remember what Tiger Woods said, “Funny, the harder I work the luckier I get.” Apply yourself as a trader and it will be no accident when your account begins to lossom.3. You must Focus to really get good at what you do.Now here is the hurdle most Forex traders struggle to get over. You have the passion and you are applying yourself to your trade, now focus and really get good at just at what you are doing. Be the expert to the experts at just that one thing. Become the master of a strategy or risk management ethodologies. Really focus on getting good at it. Stop jumping around or getting pulled from the last “latest and greatest” into the next “latest and greatest” and focus on one aspect of forex trading and know it inside out. Know it strengths and weakness. Set your sights on becoming expert on just one aspect of trading and watch it spill over in all other aspects for
your currency trading. This is the time to fail forward fast, use every setback as a learning opportunity that will propel you 3-steps ahead!4. You must Push Yourself beyond the point everyone else might have quite.In Forex Trading this is simple. Assume there is someone on the other side of your trade that is pushing themselves and sharpening their edge. To be successful you must you must do the same thing. Now is the time to examine your mental edge. Do you know the single most critical factor in any currency trade? It is you, the trader!
Sharpening you mental edge is the most difficult aspect of trading, but also the most ewarding.Start with your Forex education and gain the self-awareness necessary to maximize your strengths and suppress your weaknesses. Any expert will tell you that trading is 80% mental. It’s time to sharpen your trading to the razor’s edge and you do this through Forex education. A constant and never ending process that will become the cornerstone of your Forex experience.5. You must, without wavering, be Determined and Persist to your objective.You will fail. I can state that emphatically. However, you will not be defeated unless
you allow your failures to control your trading. It is the old adage; failure is not falling of your horse, failure is refusing to get back on. Your success depends on your ability to dismiss the criticism, rejection, self-doubt and pressures associated with Forex trading.Defining what is a winning trade, losing trade and bad trade will go a long way into developing you as a successful trader. Without the determination and persistence in all aspects of your trading life, obstacle will definitely appear closer and larger than they actually are.Take a moment and assess yourself and your trading. Do you have the key elements to succeed? Which areas are presents development opportunities? When conducting a self-evaluation it is critical to be totally upfront and honest with yourself. After all, you will only be dishonest with yourself. One of the most interesting observations you can make is that all key success factors are interwoven. One factor supports the other. This is why your Forex education is a continuous journey of forex strategy, money management and self-mastery. Set these factors as your Forex education goals and take your currency trading to new heights.

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31- The RTOS Motto: On Time And On Budget

21/2/2009 • Kategori: Teknoloji

But is an RTOS always necessary? The answer is application-specific, so understanding what one will deliver is key to determining whether it becomes a requirement or an extravagance.

In general, an RTOS can be used anywhere a non-RTOS is employed. However, it’s rare to find an operating system with a matching RTOS that has exactly the same application programming interface (API). Many of them, though, embed an RTOS within a conventional operating system. For example, Lynux- Works LynxOS and Bluecat Linux share a Linux API. LynxOS is a hard RTOS, while Bluecat inherits its base from Linux.

Linux continues to improve its real-time performance, but its worst-case interrupt latency still doesn’t meet what would be considered hard real time for an RTOS. It all comes down to quality of service (QoS). Platforms like RTLinux Free augment Linux, providing hard real-time class QoS.

It’s important to note that this type of addition often incorporates an RTOS programming environment that’s distinct from the original operating system. An RTOS is typically small compared to a conventional desktop or server OS. They often target more smaller, resource-constrained microcontrollers. For instance, CMX’s CMX-RTX and CMX-Tiny+ can run on 8-bit MCUs up through 64-bit processors.

The increased power and memory capacity of 8-bit processors is making an RTOS more desirable for these platforms. But, an OS or RTOS is usually a requirement in 16-bit platforms and up with RTOS products like Express Logic’s ThreadX, Wind River’s VxWorks, Micrium’s uCOS-II, and Green Hills Software’s velOSity being common selections. Depending on requirements, MontaVista’s Linux meets 16- and 32-bit platform requirements in the low microsecond range.

THE RTOS CORE: SCHEDULING AND PARTITIONING
Most programmers aren’t familiar with RTOS constraints and requirements. Most usually opt for an RTOS due to its performance. Most RTOS products are small and fast, yet an RTOS also adds consistency. Beyond the fact that an RTOS gets the job done quickly, it can guarantee a job will get done.

In many applications, a late result can be catastrophic. Thus, a poor result within the proper timeframe is preferable. These applications are generally called hard real-time systems. Hard real time doesn’t indicate how fast the system may be or how quickly a system may respond. Rather, it refers to how reliably a system can meet the specified requirements.

A hard real-time system may have a fixed cycle time of one minute with a response time of one second. In theory, it’s something almost any operating system could handle. This isn’t always the case, though, as anyone can attest to when waiting for a desktop application to respond within a minute.

Hard real-time systems typically have shorter cycle times and tighter response requirements. Faster processors always help, and multicore platforms can improve response time, too. The trick for developers is to match system requirements to the hardware and software, hence the importance of an RTOS in embedded applications.

An RTOS can implement a range of scheduling policies, and the application will often restrict a programmer’s choices (see the table). Non-preemptive scheduling is trivial to implement but useful in some applications. On the other hand, non-preemptive scheduling within a task can be implemented on top of a preemptive system.

Non-preemptive should not be overlooked, especially in light of new multicore processors. Here, hardware may be tuned to handle an event-based operation in which a thread will wait for an external event to occur. This approach is usually unsuitable for a single-core processor handling multiple threads. On multicore systems with many cores, though, it’s often typical to dedicate one core to handle one peripheral. It then makes sense to have that core idle while waiting for an event to occur.

As a result, preemptive, interrupt-driven RTOS architectures make up the majority of platforms deployed. These platforms have a range of requirements, issues, and solutions (see the figure). Interrupt latency is always an issue, although hardware— multiple register sets, hardware scheduling and task switching, and hierarchical priority interrupt systems—can significantly reduce this overhead.

Several issues coincide with preemption. Most are timing-related, like race conditions, deadlock, starvation, and priority inversion, which occurs when a low-priority task A owns a synchronization resource of a higher-priority task B, and a task C with priority higher than A is running.

Without a feature like priority ceilings, task C can prevent task A and C from running. A priority-ceiling feature changes the priority of task A to that of task C, allowing it to run and eventually release the resource needed by C. At this point, task A’s priority returns to normal and task C can run.

The other timing-related issues, which the programmer must address, are often the sources of bugs that are difficult to locate and correct. Trace tools become valuable assets in locating these kinds of bugs, since symptoms such as blocked tasks are the only indication of the problem

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