مجله المنتدي بسرعه الحق حط موضوع وشارك وتميز

بسم الله الرحمن الرحيم

كما عودناكم دائما بالجديد والمزيد

والتطور السريع للمنتدي

الان سوف نشق طريقنا الي عالم الواقع

ونخترق كل حدود الشبكه العنكبوتيه

لنصل الي يد وعقل كل من له عين تقرأ

اليوم والحمدلله اعلن افتتاح التجهيزات

لاول مجله لموقعنا المنطلق بسرعه الصاروخ

حيث قد جائنا البيان التالي

تم الاتفاق مع قسم الجيوفيزياء بكليه العلوم جامعه عين شمس

عن دعم مجله الموقع

والان سوف اعلن لكم عن شروط الاشتراك بها

اولا المجله سوف تكون مختصه بالجيوسينس كما عهدنا دائما

ولكن نظرا لان الراعي الرسمي لها هو قسم الجيوفيزياء فسوف تفضل الموضوعات

المختصه والمتعلقه بالجيوفيزياء عن الجيولوجيا نوعا ما

مثال علي ذلك يفضل في الجيولوجيا مثلا الصخور الرسوبيه لما لها من اهميه لكل الجيوفيزيائين في دراستهم

عن الحفريات

وطبعا الطرق السيزميه والمغناطيسيه والبتروفيزيائيه وغيرها

يجب الا تزيد الموضوعات عن صفحتين والا تقل عن صفحه

وذلك لوضع اكبر عدد ممكن من الموضوعات

مع اختيار موضوع رئيسي سيكون موضوع العدد

سوف يناول باستفاضه

وعند كتابه موضوع يجب كتباته في شكل شيق وبسيط وجميل

وينتهي عند نقطه معينه مشوقه بحيث من يريد الاستزياد منه

يذهب الي الموقع (وهذا هو ما يهمنا طبعا)

طبعا المواضيع يفضل ان تكون بالانجليزيه

وتسلم في موعد اقصاه من 7-10 ايام

وذلك طبعا كي نستطيع تخليصها قبل الانشغال بالامتحانات العمليه والنظريه

وسوف نحاول عمل نسخه الكترونيه ترسل الي ايميلات الاعضاء ان شاء الله

وتوضع المواضيع في هذا الموضوع منعا للتكرار بين الاعضاء

بالتوفيق يا شباب وياريت الهمه في ارسال المواضيع مبكرا

وكل من يريد المشاركه يرسل لي الاسم بالكامل والجامعه والقسم والايميل

لكي توضع اسفل موضوعه

اعتقد ان اللى هيكتب موضوع هيستفاد كتير برده

حتي نخرج المجله في احسن شكل يليق بنا ويشرفنا

ودمتم في رعايه الله جميعا

يا شباب

عايزين يوم الجمعه بعد الصلاه مثلا

بسم الله نفتتح اول موضوع في المجله

الموضوع مقدم من العضو

!!!!!!!!!

جميل أوي الحماس و انا حكون ان شاء الله أول المشاركين

اتمنى لكم التوفيق و النجاح

ان شاء الله النهارده انا حكون موجود

source from this site

ماشي يا عبدو

بس ياريت تحط المصدر بتاعك او لينك الموضوع وبياناتك بالظبط

المواضيع فين يا شباب

النهارده اخر يوم لتسليمها زي ما اتفقنا

we know that age of universe is 13.7 billion years

now , scientists found star of 13.2 billion years

How old are the oldest stars? Using ESO's VLT, astronomers recently measured the age of a star located in our Galaxy. The star, a real fossil, is found to be 13.2 billion years old, not very far from the 13.7 billion years age of the Universe. The star, HE 1523-0901, was clearly born at the dawn of time

This technique is analogous to the carbon-14 dating method that has been so successful in archaeology over time spans of up to a few tens of thousands of years. In astronomy, however, this technique must obviously be applied to vastly longer timescales

the abundance of a radioactive (unstable) isotope decreases all the time. The faster the decay, the less there will be left of the radioactive isotope after a certain time, so the greater will be the abundance difference when compared to a stable isotope, and the more accurate is the resulting age.

Yet, for the clock to remain useful, the radioactive element must not decay too fast - there must still be enough left of it to allow an accurate measurement, even after several billion years.

Large amounts of these elements have been found in the star HE 1523-0901, an old, relatively bright star that was discovered within the Hamburg/ESO survey

The star was then observed with UVES on the Very Large Telescope (VLT) for a total of 7.5 hours

use 6 elements

they use vlt to measure radioactive elements

Ever since the star was born, these "clocks" have ticked away over the eons, unaffected by the turbulent history of the Milky Way. They now read 13.2 billion years.

The Universe being 13.7 billion years old, this star clearly formed very early in the life of our own Galaxy, which must also formed very soon after the Big Bang.

this resarch was done by

McDonald Observatory, Texas

Department of Astronomy and Space Physics, Uppsala University, Sweden

source

European Organisation
for Astronomical
Research in the
Southern Hemisphere

eso

طبعا اكيد لسه هتظبط المواضيع دي ، يعني حرف ناقص

تربط الجمل ف بعض

كده

بس الموضوع استرفيزكس

بسم الله الرحمن الرحيم

هذا الموضوع ان شاء الله سوف أشارك به في المجلة يا رب يعجبك يا صالحين

هو عن 4D seismic technology

http://mihd.net/7oln20

name: hosny hassan moussa

4th year geophysics

faculty of science

alexandria university

hosny_diab@yahoo.com

موضوع الاخ والمشرف العزيز darsh

موضوع اكثر من رائع وفكره جديده

Seismic Data Applied to Subsurface Interpretation
Introduction
On a fundamental level, seismic data can provide two major benefits. First, seismic data can be acquired over areas that do not have any well data. The scond benefit is that seismic data can provide explicity 2D data as opposed to the 1D nature of wellbore.The data on the seismic line (seismic section) may actually represent a very complex 3D subsurface geologic world.
Assumptions and Limitationsg
to make a clear interpretation for an area, data used must be properly acquired and processed appropriately. some possible major problems include severe horizontal velocity gradient, high noise area, or an extremely complex geologic subsurface. all of which may invalidate many assumptions necessary for the acquisition of good data. If these problems are present, they may present a challenge for even the best geophysict. In such instances, the expertise of geophysict may be absolutely necessary to solve the complxities. Before totally discarding the use of geophysics in these areas, you should recognize that if geology is complex enough to cause these severe problems, it it is not going to be a trivial exercise to find the solution on well data alone. Even in these complex areas, seismic data may contain valuable information that can be used in creating a reasonable subsurface interpretation.
The process
The procedure for making subsurface maps using seismic data is very similar to the sequence of steps used in constructing interpretations from subsurface well log information. The first step is one of the DATA VALIDATION, i.e.. analysis of what the seismic data represent. Do the seismic data actually have some relationship to the geology in the subsurface? This procedure is similar to the checking one does when a log is first used. In the case of log data, desisions about the validity and meaning of the log response must be made before the data can be used to form an interpretation.
The second step is the actual INTERPRETATION of the seismic section. This step is analogous to the correlation of well logs when using just subsurface well log information. Because the validity of the remaining work rests on having an accurate and geologically correct interpretation of the seismic data. this is the most important part of the process.
The third step involves EXTRACTING THE INFORMATION from the seismic data and transferring it onto the map so that it can be used effectively. Usually, transferring the data to a map is referred to as posting. This procedure is practically indentical to that used when recording subsurface well log data. Since seismic sections have 2D aspect that well log data do not possess, there are some unique aspects to this step when using seismic data. This step also represents the merger of the subsurface and the seismic information. Both types of data should be posted and used to construct the final interpretation.
An appeal is made to geophysicts as well as geologists. Very often, there are two sets of maps: the geological map and the geophysical map. A subsurface map should accurately represent the geology and both well logs and seismic data represent physical measurements of the subsurface. There is only one configuration of tdhe subsurface, and it is the job of the mapper to create an integrated and reconciled interpretation using all the data available.
The last step is the CONSTRUCTION OF THE SUBSURFACE GEOLOGICAL MPAS. This step represents the culmination of the previously work, and in many instances will be the result by which your work is measured. It is only as good as the information it contains, so do not rush to begin this step before th previous steps are completely finished.
In practice, though, this is never the last step. Several iterations of validation, interpretation, posting, and mapping are typically necessary before a satisfactory subsurface map is completed.
At some point it will become apparent that most of the major questions have been resolved and a satisfactory map has been made. While pride and satisfaction in the result is deserved, always keep in mind that additional data from either drilling or addiltional seismic shooting will almost always change some of your ideas. These changes may be small, but subsurface mappping can never perfectly represent the structural configuration of the earth. The more your ideas are actually tested, the more obvious it becomes that mapping is both art and science. Ideally, you will asymptotically approch the truth as more data become available. The measure of an interpreter is his or her ability to approch the truth quickly with the limited data available.