استانداردهای طراحی خوابگاه دانشجویی

نویز noise در سیتمهای رادیویی
 RF  و مهار آن

نویز به سیگنال ناخواسته میگویند که بر روی امواج منتشر شده از سیستمهای رادیویی سوار شده و باعث تغییر شکل امواج و دگرگونی هدایت آنان میشود

نویزها سه دسته اند

نویز های زمینه

نویزهای نوسانی

نویزهای مزاحم

در سیستمهای رادیویی بیشتر نویزهای مزاحم باعث اختلال میگردد نویز مزاحم نویزی است که بصورت سیگنال های پراکنده بر روی سیگنال اصلی نشسته و باعث کندی سرعت سیگنال یا تغییر مسیر میشود بدلیل عدم رویت کلیه سیگنالهای رادیویی مهار و دفع آن به آسانی صورت پذیر نمیباشد در صنعت نصب و راه اندازی دزدگیرهای فروشگاهی غالبا از دستگاههای مخصوص جهت تشخیص نویز مزاحم استفاده میگردد مانند اوسیلوسکوپ البته استفاده از این دستگاه امروز رایج نیست و امروزه بردهای تولید شده در این صنعت بگونه طراحی و تولید میشوند که قابلیت مهار یا هدایت نویزهای مزاحم را داشته باشند

امروزه برای رفع نویز اقدامهای گوناگون صورت میگیرد در سیستمهای رادیویی و دزدگیرهای فروشگاهی غالبا از بردهایی استفاده میشود که قابلیت دفع نویزهای سطحی را دارند در زمینه دزدگیرهای فروشگاهی در اغلب موارد با دونوع نویز مزاحم برخورد میشود

یک .نویزهای فعال

این نوع نویز را نویز های جاری در پیرامون بصورت فراوان و مستمر وجود دارند در خصوص نحوه رفع نویز معمولا در بردهای استفاده شده پورتی جهت هدایت امواج مزاحم تعبیه گردیده است که توسط یک سیم از قسمت نول GND این امر رفع و دفع میگردد البته در بعضی از بردها پتانسیومترهایی تعبیه میگردد که در صورت وجود نویز گیری دزدگیر با تغییراتی  میزان اختلال در سیستم های دزدگیر را به حداقل میرساند لذا دفع و هدایت نویزهای فعال بدلیل جاری بودنشان قابل کنترل میباشند

دو .نویزهای غیرفعال یا ترکیبی این نوع نویز ها معمولا در خطوط تلفن و کابلهای برق فشار قوی و سیم کشی ساختمان می نشینند و با توجه به نوسانات برق یا افزایش و کاهش ولتاژ ضعیف و قوی میگردند حجم نویزهای مزاحم بر روی سیگنالها زیاد بود و بهمین خاطر گاهی توسط سیم کشی ساختمان یا خطوط تلفن پراکنده میشوند این نوع نویزها در ابعاد کوچکتر در ترانزهای لامپ های تولیده شده مانند SUV و غیره بسیار شدید میباشد بطوریکه در بعضی موارد باعث عدم انتقال امواج و سیگنالهای دزدگیر به محیط دورو برش میگردد جهت رفع یا کنترل یا دفع این نویزها راههای مختلف وجود دارد و در مواردی دفع این نویزها بطور کامل امکان پذیر نیست و جهت  کنترل آن و یا حتی نصب دزدگیرهای فروشگاهی نیازمند تعبیه ریپ گیرهای الکتریکی در کنتورهای برق میباشد

لذا بصورت تجربی و همینطور عدم رویت امواج و سیگنالهای مزاحم  با تغییر  محل آنتن ها یا جابجایی SRNDER  با TRANSFER تا حدی به جواب مطلوب میرسیم در بعضی موارد با استفاده از خروجی نول از کنتور و هدایت آن به GND  مهار میگردد لذا بدلیل غیر فعال بودن این نویزها در بعضی موارد موقع نصب دزدگیر فروشگاهی از تداخل امواج یا نویز مزاحم خبری نیست

اما بعد از اندک زمانی و حتی در بعضی مواقع بعد از سپری شدن یک یا چند روز نمایان میگردد لذا داشتن تجربه تخصص در زمینه برق و مخابرات میتواند در هدایت و رفع نویزهای غیرفعال بسیار کارآمد باشد

history of rental car in the world and iran

In the past many years, because not all people had a car, those who had a horse or carriage and a chariot rented them to others. But the history of car rental dates back to 1912 when a German company first started operating a lease of its three cars, but after that, a person named  Ohoma in the United States in 1916 bought his Ford Motor car in . When he rent his car, he could buy 18 cars from Ford for a very short period of time, he rented a car for each mile 10 cents  . Then, in the following years, a man named Walter Jacobs with 12  cars was a competitor for Ohama. The two are the founders of car rentals and gave cars to people. And in 1920, Gadfree began to operate in the United Kingdom, which, about 60 years later, in the early 80’s, could sell his stock to a company called Europcar. During the Second World War car rental flourished so much that most car rental companies were established in those years.i want tell you about history of car rentals iran, rental car in iran is a new and modern industrial that started from 1930 in Tehran but we can find so many company in Shiraz, Isfahan, Shiraz and so many of tourist cities.

Today in iran many car rental offices use a wide variety of cars in terms of budget and space requirements, and some also use specialized cars based on their location such as converters, valid models, hybrid / electric vehicles or SUVs. And travelers. In large airports or in larger cities, some independent rental car agencies provide rental cars. Some of the specialized companies like Rent-a-Wreck offer cars – car rentals and foreign cars – older cars at lower prices for car rental rates.

To enable a consistent classification and easy comparison of car rental rates, the Association of Car Rental Industry Systems (ACRISS) has developed the ACRISS Code Machine Code System. This description of the size, the number of doors, the type of gearbox (manual / automatic), and whether the car is air-conditioned, is encoded in four letters. The first letter in the Acriss code represents the general classification of the vehicle (eg, mini, economy, compact, etc.). The second name suggests the type of vehicle (eg 4 doors, estate, conversion, SUV, etc.). The third name is generally used to specify the type of transmission, although it can also be used to describe a multi-wheel car, and the fourth name specifies the type of fuel, and whether the car is air-conditioned.

Additional classifications based on the number of seats and trunk volume are also set up by the Real-Time Car Rental Association to provide an integrated system for evaluating types of cars on online booking systems such as Amadeus, Galileo GDS, Worldspan or Saber.

So Rental car Iran is so graceful to give better and best services to customers and got they satisfaction. We try to do the best and  work hard to give better services to our customers and prepare high quality services for our loyalty customesrs.

هتل پانسیون چیست ؟

Why rental car and car rental?

In today’s world economy, human  are looking for lower cost, saving and optimizing their time so that they can continuously be more prosperous in their life and make their life beautiful and use facilities. With the financial situation and income of individuals, facilities are far from reachable, yet for Getting these features is a great way to get tested. In the same way, we offer you a way that you can save on your expenses, and enjoy the benefits of living in comfort. Car rental agencies like rentalcariran.com are trying to provide the modern and comfortable cars with the best  services that you can do your business and have a good travel then  you can enjoy your life.  the progress of the car industrial in the 21st century, the cars  are not  use only for driving of the vehicle we can use for other human requirements and demands, but also a car are used for comfort, comfort and even for recreation. Most people get this important by driving. The journey is always from the needs of the human being from the old to the present, which for some time distances humans from the difficulties and problems of life and brings a relative calm. For a comfortable, safe and memorable journey to happen, using your car and moving to another location is the best way to help you enjoy your journey as well as preventing huge fares. Time during the day is the important things of all people that a person tries to make it excellent. In order not to miss the time and do not waste time or lose time, one way is to use a car that brings you to Do all your goals at home and do not be late with public transport . Also, stay safe from costs that you pay for transportation. The stress and fear of accidents, financial losses, and damage to action are always in the minds of the car crews and rider of the car, which is responsible for car. insurance in car rental companies will pay for any damage costa or accident costs also all its costs. By enjoying a car without a driver, you enjoy driving, going on a journey and doing things yourself, and with the resolve your problems to use a personal car for less depreciation and for longer life, as well as maximum benefit from time and at least the cost to your goal, which is our wish. Do it the best way.

What are the documents and conditions for car rent?

Obviously, car rentals are worried about getting their car safely and fully, so they are asking for a guarantee.

in this way  and in a variety of ways. Usually, rental cars have full bodywork insurance .

Documents required to rent a car without a driver:

Valid National ID (Certificates like passport).

Deposit or expensive cars

Signing the contract.

Conditions for car rental:

Determine the number of rental days in the contract.

Determine the maximum mileage by car per day.

Giving a percentage of the cash value of the car as a deposit to the car rental company until the end.

Car Rental Bid:

Inspection of the bodywork and inside of the car when delivered.

In case of car insurance, be sure to ask the car rental.

Car card and third party insurance.

The fact that the technical problems of the car, which is due to the normal use of the car, is not the responsibility of the renter.

Insert the hours and days of delivery for the wrongful inquiry.

It is even more likely that the car’s life is less than 2 years old to be covered by the manufacturer’s warranty.

It is not even possible to rent a car for someone else; the responsibility and personal concerns of the signing and guarantee of the contract will differ greatly from the person who is not informed and responsible.