Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userدراسة طيفية بالأشعة تحت الحمراء للكوك البترولي السوري و أشكاله المحدثة و استخدامها كمصافٍ جزيئية لفصل مكونات المحاليل القطبية و اللاقطبية
942
1 0
0
(
0
)
Added by
Damascus University ورقة بحثية
Publication date
2003
fields
Chemistry
and research's language is
العربية
Created by
Shamra Editor
Ask ChatGPT about the research
عولج فحم الكوك البترولي السوري الحاوي على نسبة كبيرة من الكبريت بعدة طرائق ثـم درسـت بنيته الكيميائية و التغيرات الحاصلة عليها نتيجة المعالجات المختلفة، و من ثم اُستخدم فحم الكوك المعالج و غير المعالج في فصل المحاليل القطبية و اللاقطبية. و قد اُختير مزيج من رباعي كلوريد الكربون CCl4 و الميتانول CH3OH لدراسة قدرة هـذه الفحـوم على الفصل، ممثلة بامتزاز جيبس على هذه الفحوم، و من ثم قُورنت النتائج التي تـم الحـصول عليهـا بتحاليل الأشعة تحت الحمراء، حيث تبين وجود علاقة وثيقة بـين الخـواص الامتزازيـة للفحـم و بـين المجموعات الوظيفية الموجودة على سطح الفحم.
No English abstract
References used
CONCAWE,s Petroleum Products and Health Management Group, Petroleum coke, Bruussels, October 1993
Osypov, O.A., Minkin, V. E., Havad Book of diplole momenuts, vishaya Shcola, 1965 Moscou.PP.64
Artificial intelligence review:
Research summary
تتناول هذه الدراسة معالجة الفحم الكوك البترولي السوري الذي يحتوي على نسبة عالية من الكبريت. يتم تحليل التركيب الكيميائي والتغيرات الناتجة عن المعالجة باستخدام الأشعة تحت الحمراء لدراسة قدرة الفحم المعالج على فصل المحاليل القطبية وغير القطبية. تم اختيار CCl4 و CH3OH لدراسة قدرة الفصل. تقارن النتائج مع تحليلات الأشعة تحت الحمراء لتحديد فعالية الفحم كمنخل جزيئي في عملية الفصل.
Critical review
دراسة نقدية: الدراسة تقدم مساهمة قيمة في مجال معالجة الفحم الكوك البترولي واستخدامه كمنخل جزيئي. ومع ذلك، يمكن أن تكون هناك بعض النقاط التي تحتاج إلى مزيد من التوضيح. على سبيل المثال، لم يتم توضيح بشكل كافٍ كيفية تأثير نسبة الكبريت العالية على فعالية الفصل. كما أن الدراسة قد تستفيد من مقارنة أوسع مع أنواع أخرى من الفحم أو المواد المماثلة لتحسين فهم الفعالية النسبية للفحم الكوك البترولي السوري.
Questions related to the research
-
ما الهدف الرئيسي من الدراسة؟
الهدف الرئيسي هو دراسة تأثير معالجة الفحم الكوك البترولي السوري على قدرته على فصل المحاليل القطبية وغير القطبية باستخدام الأشعة تحت الحمراء.
-
ما هي المواد المستخدمة في الدراسة لفصل المحاليل؟
تم استخدام CCl4 و CH3OH لدراسة قدرة الفحم المعالج على فصل المحاليل القطبية وغير القطبية.
-
ما هي التقنية المستخدمة لتحليل التغيرات الكيميائية في الفحم المعالج؟
تم استخدام الأشعة تحت الحمراء لتحليل التغيرات الكيميائية في الفحم المعالج.
-
ما هي النقطة التي يمكن تحسينها في الدراسة؟
يمكن تحسين الدراسة من خلال توضيح كيفية تأثير نسبة الكبريت العالية على فعالية الفصل ومقارنة نتائجها مع أنواع أخرى من الفحم أو المواد المماثلة.
rate research
Read More
A new ion exchanger has been prepared from syrian petroleum coke (S. P.
C) of high sulphur content. Preparation of this ion exchanger was carried out
by simple treatment of S. P. C with oleum at room temperature followed with
statical ion exchange
in aqueous sodium chloride solutions.
The First, SPC ion exchanger with granular structure resulted from
reacting 20 gr of the SPC granules with 20 ml of oleum. Where as a friable ion
exchanger was produced when 40 ml of oleum were used in the process.
The adsorption capacity of the two SPC ion exchangers was found out to be
100 mgeq and 170 mgeq respectively.
The nanocrystals of semi-conductive metal oxides attracted great attention because of their interesting properties. Therefore, our study of some physical properties of the pure and Sb doping Tin Oxide compound. The measurement of the infrared spectru
m of pure tin oxide compound shows vibrational frequencies which has two energy (415.585, 574.683) cm-1 and the Sb doping Tin Oxide with a rate of (4wt%) shows vibration frequencies and the most prominent is which has two energy (417.513, 669.178) cm-1. the study showed that the largest value of the absorbance, absorption coefficient was in the sample Sb doping Tin Oxide compound respectively are A=0.7560, α=17.389 cm-1, at the vibrational frequency 3447.13 cm-1, and the refractive index for pure tin oxide ranged from (1.832 - 2.371). As for the Sb doping Tin Oxide compound, the refractive index value was between (1.709-2.643).
Terfenadine reacts with mixed anhydriedes (Malonic and acetic anhydrides)
producing a yellow-coulored product with intense fluorescence. Based on this
fact, a spectrophotometric method was developed for the determination of
terfendaine in dosage f
orms. The relation between the absorbance at 395 nm and
the concentration is rectilinear over the range 0.5-5 μg.ml-1. The reaction product
was also measured spectrofluorimetrically at 435 nm after excitation at 395 nm.
The fluorescence intensity was directly proportional to the concentration over the
range 0.5-4 ng.ml-1. The different parameters affecting the development and
stability of the reaction product were carefully studied and incorporated into the
procedure. The proposed spectrophotometric method was successfully applied to
the determination of terfenadine in tablets and suspensions; the % recoveries
were 99.83 ± 0.75 and 99.65 ± 0.83, respectively. The proposed
spectrofluorimetric method was applied to the determination of terfenadine in
spiked human plasma. the % recovery was 99.35 ± 2.19. The method is highly
sensitive and specific. No interference was noticed from co-formulated drugs,
such as pseudoephedrine and ibuprofen.
The recycling of debris, is considered as one of the most important resources for
constructing base &subbase road layers in many countries.
There are two problems for RCA: first, the considerable size it takes up when
collected and second, its low
technical properties. The second problem appears in
countries which don't have natural quarries and they have to use RCA in certain fields
(concrete mixes, asphalt mixes, granular road layers).
This research discuses preparing RCA aggregates, by recycling the concrete waste,
which comes from Al-Sallima landfill, near to Damascus city. Then many tests are carried
out to study the effect of changing the aggregate's size on their mechanical & physical
properties, and also to study the possibility of using these aggregates in constructing base
&subbase road layers.
As a result, it has been found that we can use RCA for constructing unbound base
&subbase road layers, and the mechanical & physical properties of these RCA get better
when the aggregate's size gets smaller, except in Proctor test. In this test, Proctor density
and optimum moisture content get better when aggregate's size gets bigger.
With the advent of contextualized embeddings, attention towards neural ranking approaches for Information Retrieval increased considerably. However, two aspects have remained largely neglected: i) queries usually consist of few keywords only, which i
ncreases ambiguity and makes their contextualization harder, and ii) performing neural ranking on non-English documents is still cumbersome due to shortage of labeled datasets. In this paper we present SIR (Sense-enhanced Information Retrieval) to mitigate both problems by leveraging word sense information. At the core of our approach lies a novel multilingual query expansion mechanism based on Word Sense Disambiguation that provides sense definitions as additional semantic information for the query. Importantly, we use senses as a bridge across languages, thus allowing our model to perform considerably better than its supervised and unsupervised alternatives across French, German, Italian and Spanish languages on several CLEF benchmarks, while being trained on English Robust04 data only. We release SIR at https://github.com/SapienzaNLP/sir.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
