• LED

    تعداد صفحه : 42بررسی راه انداز «لد» [LED] بسیاری از دستگاه های الکتریکی قابل حمل امروزی به راهکارهای راه انداز «لد» با نور پشتی نیاز دارند. این راه انداز، باید دارای ویژگی های زیر باشد. کنترل مستقیم جریان، بازدهی بالا، نور ضعیف pwm، حفاظت اضافه- ولتاژ، قطع بار، کوچکی اندازه و سهولت کاربری. این مقاله به بررسی هر کدام از این ...

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  • koolmoogari(gav)

    تعداد صفحه : 14كولموگري نژاد كولموگري در بخش هاي كولموگري و آركانژيل ناحية آركانژيل شكل گرفت. يكي از بهترين و قديمي ترين نژادها در روسيه است. حتي در قرن 17، گله هاي كولموگري به خاطر سرعت سريع رشد و توليد شير زياد، مورد توجه بودند. توسعة پرورش گله در جلگه هاي آبرفتي رودخانة "سِوِرنا يا دوينا" به خاطر چمنزارها و چراگاه هاي دشت سيلابي كه ...

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  • kolmogory

    تعداد صفحه : 8Kholmogory The Kholmogory breed was formed in Kholmogory and Archangel districts of Archangel region. It is the oldest and one of the best breeds in the country. Even in the 17th century Kholmogory cattle were noted for their fast rate of growth and high milk production. The development of cattle breeding in the alluvial plain of the Severnaya Dvina river was aided by the available flood plain meadows and pastures with legume-grass mixtures. Excellent pastures in the summer and liberal feeding with high quality hay in winter were the bases for developing such valuable ...

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  • Joint stock company

    تعداد صفحه : 20Joint stock company A joint stock company (JSC) is a type of business partnership. Certificates of ownership or stocks are issued by the company in return for each contribution, and the shareholders are free to transfer their ownership interest at any time by selling their stockholding to others. In Britain, and elsewhere, there are two kinds of joint stock company. The private company (sometimes called an unlisted company) is one in which the shares are not offered for sale on the open market. The shares are usually only held by the directors and Company Secretary. ...

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  • January 25

    تعداد صفحه : 10 January 25, 2008   By Bruce Cameron If you want some exposure to equity markets but also want security of income, with-profit products smooth out the stock market roller coaster and guarantee your capital. But an investigation by Personal Finance finds they are not for everyone (Note: this is a three-part story). In recent years, with-profit products have increasingly come under the spotlight and have fallen into disfavour with many financial advisers and retirement fund consultants. This has been a result of market volatility, the implosion of ...

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  • Hybrid Soft Computing Systems

    تعداد صفحه : 50Hybrid Soft Computing Systems: Where Are We Going Piero P. Bonissone1 Abstract. Soft computing is an association of computing methodologies that includes fuzzy logic, neuro-computing, evolutionary computing,and probabilistic computing. After a brief overview of Soft Computing components, we will analyze some of its most synergistic combinations. We will emphasize the development of smart algorithm-controllers, such as the use of fuzzy logic to control the parameters of evolutionary computing and, conversely, the application of evolutionary algorithms to tune fuzzy ...

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  • Gholamreza Takhti

    تعداد صفحه : 7Gholamreza Takhti Gholamreza Takhti (Persian: غلامرضا تختی, August 27, 1930 – January 7, 1968), sometimes Gholam-Reza, Gholam Reza, or Qolam Reza, is the most famous wrestler in Iranian history. He was most famous for his chivalrous behaviour and sportsmanship, and he continues to symbolize the essence of sports to the Iranian people.Contents [hide] 1 His Early Life 2 His Character 3 His Death 4 External links 5 References His Early Life Takhti was born in Tehran, Iran (Persia) on August 27, 1930. Takhtis family was poor, leaving Takhti with only 9 ...

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  • gharardadane proxihaye veb

    تعداد صفحه : 30قرار دادن پروكسي هاي وب داراي محدودكنندة ظرفيت سرور خلاصه اين مقاله، مسألة يافتن يك مجموعة محل اسكان با حداقل هزينه كه هزينة خدمات دهي به درخواستهاي دستيابي در يك محيط فقط خواندني را بررسي كرده و محدوديتهاي ظرفيتي گره ها را مدنظر قرار مي دهد. مجموع هر بار تحميل شده بر هر پروكسي نبايد از ظرفيت آن بيشتر شود. نتايج حاصل ...

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  • Geography and Climate

    تعداد صفحه : 19Geography and Climate Situated in Northern Europe, Sweden lies west of the Baltic Sea and Gulf of Bothnia, providing a long coastline, and forms the eastern part of the Scandinavian Peninsula. To the west is the Scandinavian mountain chain (Skanderna), a range that separates Sweden from Norway. Sweden is surrounded by Norway (west), Finland (northeast), the Skagerrak, Kattegat and Öresund straits (southwest) and the Baltic Sea (east). It has maritime borders with Denmark, Germany, Poland, Russia, Lithuania, Latvia, and Estonia, and it is also linked to Denmark ...

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  • file_4635

    تعداد صفحه : 9TAP 416- 4: Building up a transformer Producing flux, linking flux In a transformer a primary coil produces flux: an electric circuit of varying current driven through a coil (current-turns) drives a changing flux through a magnetic circuit. The magnetic circuit interacts with a second electric circuit. The changing flux through this second electric circuit produces an emf in the circuit.  You will need: gimballed bar magnet (Magnaprobe) signal generator 240-turn coil 1100-turn coil digital multimeter microvoltmeter iron rod aluminium rod search coil oscilloscope power ...

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  • Example LED Driver Circuit

    تعداد صفحه : 2Example LED Driver Circuit Running an LED with pulses to get maximum brightness    To give maximum brightness an LED needs to be driven by a pulse circuit. In this way, it is possible to put 0.5 Amp current pulses through an LED at a frequency of around 100Hz which fools the eye into thinking that it sees a continuous light. If the LED is run at 0.5 Amps for very long, it will burn out (usually within a fraction of a second). By keeping the pulse duration relatively short, we can avoid overheating the LED. This circuit allows adjust ment of the pulse width so that ...

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  • electronic memory

    تعداد صفحه : 5حافظه های الکترونیکی در انواع گوناگون و برای مصارف مختلف ساخته شده اند . حافظه های فلش به دلیل سرعت بالای آنها در ثبت اطلاعات و همچنین استفاده فوق العاده آسان بسیار پر فروش و پر طرف دار می باشند . از این رو در دوربین های دیجیتالی ، تلفن همراه و سایر دستگاه ها شاهد استفاده روز افزون از آنها هستیم . شیوه ذخیره اطلاعات در ...

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  • Dry Cow and Transition Cow Nutrition

    تعداد صفحه : 18Dry Cow and Transition Cow Nutrition  Mary Beth de Ondarza, Ph.D    Published: March 03, 2004    Fresh cows need to calve in with few metabolic problems. Fresh cows also need to eat aggressively as soon as possible and have few sub-clinical metabolic problems. Goals of the far-off dry period include maintaining body condition, maintaining protein and muscle reserves, rejuvenation of the rumen wall, and provision of needed minerals and vitamins. During the pre-fresh period, nutrient requirements increase while dry matter intake decreases. Ration nutrient ...

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  • Decorative concrete

    تعداد صفحه : 4Decorative concrete Decorative concrete involves concrete structures being used in roles that are not strictly related to concretes functional elements. Concrete has long been prized for its great strength, especially when combined with steel rebar. Concrete can be used for, among other things, decorative walls, floors and countertops that are both structurally sound but also provide a decorative finish that resembles polished stone and has an extremely low cost for materials. Forms of Decorative Concrete Concrete Countertops Concretes versatility lends ideally to ...

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  • Computer memory types

    تعداد صفحه : 36Computer memory types  Volatile  DRAM, e.g. DDR SDRAM SRAM Upcoming Z-RAM TTRAM Historical Williams tube Delay line memory  Non-Volatile  ROM PROM EAROM EPROM EEPROM Flash memory Upcoming FeRAM MRAM PRAM SONOS RRAM NRAM Historical Drum memory Magnetic core memory Bubble memory   A USB flash drive. The chip on the left is the flash memory. The microcontroller is on the right. Flash memory is non-volatile computer memory that can be electrically erased and reprogrammed. It is a technology that is primarily used in memory cards, and USB flash drives (thumb ...

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  • Cache memory

    تعداد صفحه : 4Cache memory Cache memory is special memory that operates much faster than SDRAM memory. It is also more expensive. It would be impractical to use this memory for the entire system both for reasons of expense and physical board and bus channel design requirements. Cache memory lies between the microprocessor and the system RAM. It is used as a buffer to reduce the time of memory access. Cache memory Cache memory is special memory that operates much faster than SDRAM memory. It is also more expensive. It would be impractical to use this memory for the entire system both ...

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  • Brahman

    تعداد صفحه : 9Brahman inadequate food supplies, insect pests, parasites, diseases and the weather extremes of tropical India, the native cattle developed some remarkable adaptations for survival. These are the "sacred cattle of India," and many of the Hindu faith will not eat meat from them, will not permit them to be slaughtered, and will not sell them. These facts, in conjunction with he quarantine regulations of the United States, have made it difficult to import cattle from India into this country. All the Bos indicus cattle are characterized by a large hump over the top of the ...

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  • biography of imam khomeini

    تعداد صفحه : 17In The Name Of Allah Tittle : Biography of Imam Khomeini Teacher : Mis.Zareii Student : Maryam fathi Winter 86 Biography of Imam Khomeini Childhood and Parents Imam Khomeini was born in the town of Khomein, about 350 kms south of Tehran in the central province, on the 20th of Jamadi-Al-Thani, the year 1320 L.H.,(September 24, 1902). Also the birth anniversary of Fatima Zahra, the daughter of Prophet Mohammea (peace be upon him). He was named Ruhollah. The sprit of God. His father, Ayatollah Seyyed Mostafa Musavi, assumed the religious leadership of the people of ...

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