Tishreen University Journal -Basic Sciences Series

Study of rational points on the elliptic curve

2024-02-04T04:39:28+00:00

This research focused on studying of a special type of curves given by non-singular weierstrass equation which called elliptic curves, the study of elliptic curves had answered many of purely theoretical questions asked by mathematicians , and it has great importance at the presenttime for its use inencryption,which depends on the algebraic structure of these curves ,so it has been the focus of attention of many recent studies.

One of the most important theorems is Nagell-lutz theorem which used in the studying of elliptic curves since it is a practical tool in finding all rational points of finite order on an elliptic curve over the rationals , the fundamental concepts were employed in the theory of projective geometry including the theorem of bezout to get the consequences of this study, this paper have focused on finding the rank of elliptic curves which has at least rational point of order two .

in addition to obtaining some important results related to these curves.

Inclusion properties of the generalized homogeneous Herz-Morrey spaces

2024-02-27T05:29:32+00:00

In this paper, we study a problem at functional analysis, it is the inclusion of functional spaces, in the beginning we defined the generalized homogeneous Herz - Morrey space , which is a generalization of the homogeneous Herz- Morrey space, then we studied some of its basic properties, where we proved that it is linear, normed and complete space, then we studied its inclusion properties for different cases of the parameters , then we studied the inclusion between the generalized homogeneous Herz- Morrey space and the weak generalized homogeneous Herz – Morrey space, finally we studied the inclusion between the weak generalized homogeneous Herz – Morrey space.

Study of carbonate system variations with depth in the marine waters off the coast of Latakia city

2024-01-15T05:08:22+00:00

This research focuses on the study of seasonal variations in both Total Alkalinity (AT) and Total Dissolved Inorganic Carbon (CT) in the marine waters of Latakia city between the summer and winter of 2022, and how they are affected by certain hydrological factors of the waters (temperature and salinity), and the impact of all this on the pH values in the marine water column (5-200m). This study is the first to take samples at this depth. The values of alkalinity ranged between 2618.7-2725.5 μmol/kg and the CT values between 2256.8-2453.7 μmol/kg, with pH values of 7.84-8.16 in the summer, coinciding with changes in temperature (26.92-27.12°C) and salinity (37.53- 37.21‰). In winter, the temperature values decreased between 18.92°C at the surface and 18.47°C at a depth of 200m, accompanied by changes in salinity from 35.32‰ at a depth of 5m to 34.65‰ at 200m, leading to a decrease in alkalinity values between 2560.7-2660.5 μmol/kg and an increase in CT values between 2365.8-2435.7 μmol/kg.

As a result, climate change due to the increased concentration of CO2 in the atmosphere has affected the increase in atmospheric temperature, accompanied by changes in the temperature of marine waters and changes in carbonate system values and pH. This will negatively reflect on biodiversity and threaten many living organisms, especially those that use carbonate ions to build their shells, and generally affect marine currents.

Studying effect of Magnesium and Aluminum ions on structural properties of M- type Barium Hexaferrite

2023-12-20T07:54:52+00:00

It was prepared ferrite hexagonal BaFe₁₂O₁₉ pure and ferrite substitutes BaFe_12-2xMg_xAl_xO₁₉ with (x=0,0.5,1,2) using ceramic method .It was sintered BaFe₁₂O₁₉ at 1150°c for two hours .The structural characterization of the composites are investigated by x_ray diffraction device.The results obtained using XRD technology revealed the formation of the hexa-ferrite M-type hexagon with average crystal lattice constants (a=5.871,c=23,119)A°,it was found the replacement rate increased ,peak shift occurs at (114) plane to the large 2θ angle.The distance between the crystal planes d for undoped samples (2.620_2.621)A°,after it doped with aluminium and magnesium oxides decreased (2.615_2.611)A°.After sample was sintered and the sintering process causes the increasing of intensity,but decreases the FWHM value,it shows that sintering process influences the grain growth of barium hexaferrite crystals from 34.291nm to 39.902nm and it was noticed when ferrite substitutes increase the values of the crystal lattice constants decrease.

Some characterization of glauconite in Syrian coastal phosphate

2024-01-15T05:10:12+00:00

The aim of the present study is to characterize the glauconite grains associated with the coastal chain phosphate that distinguish them from Palmyra phosphate, and to compare them between the three sites where it is spread: Ain al-Tineh, Ain Lillon (south of the Haffa area), and Qalaat al-Muhalaba (north of Qardaha.

To achieve the objective of the study, a group of samples were collected from the study sites and microscopic thin sections were prepared, that were studied with polarizing microscopy in the laboratories of the Department of Geology at the Faculty of Science, Tishreen University. The shape and color of the glauconite grains were compared at the three sites. The potassium ratios were compared between the studied sites, which was analyzed in the laboratories of the Atomic Energy Commission – Damascus.

The sedimentary medium in the coastal phosphate environment was suitable for the living of microbes and bacteria, working to stabilize the trivalent iron, aluminum and magnesium forming the characteristic green slurry of these grains in the first stage, then the microbes work to introduce potassium into the crystalline structure of metals and organic matter.

Sedimentalogical Evolution of the northern Baer-Bassit during upper Cretaceous

2023-11-29T20:24:23+00:00

The sedimentological study of five geological sections in the Upper Cretaceous deposits, exposed in northern Al-Baer-Basit which located beneath the ophiolitic cover, revealed the presence of four intermediate sedimentary sequences in the Turonian-Senonian deposits: regressive, transgressive-neutral, regressive-regressive and transgressive. These sedimentary sequences are related to sea level changes and the uplift of the bottom of the sedimentary basin because of ophiolitic obduction in northwestern of Syria. During the Turonian-Senonian, the sedimentation environments ranged from subtidal in the open sea to supratidal to even continental environments, in which sediments are rich in detrital were dominant

Synthesis two crystalline compoundsSr2-xSmxCoO4 belonging to the RUDDLESDEN-POPPER series by partial sustention of strontium (Sr) with samarium (Sm) and study their crystal structure and some physical properties.

2023-11-27T12:19:53+00:00

The oxides of Sr2-xSmxCoO4 (X=1 ,1.25) were Synthesised using the ceramic method and the effect of partial sustention of Sr with Sm in crystal lattice of compound Sr2CoO4has been studied. The phases and structures were studied using powder x-ray diffraction and HRTEM(High Resolution Transmission Electron Microscopy). The compounds found to be of the 214 crystal system at n=1 of the tetragonal system of the I4/mmm space group of K2NiF4 crystal model. It was observed that the value of the parameter c decreased while the value of the parameters a,b and the volume of the cell of crystal structure increased with the increasing of the value of X. Magnetic properties were measured and curie temperature was observed between 160-200 k for sample of x=1, while antiferromagnetic behaviour was observed at 35 K for sample X = 1.25.

The influence of alumina ratio on the properties of the Al-MCM-41 mesoporous structure

2023-10-24T21:56:57+00:00

Three samples of the mesoporous structure Al-MCM-41 were prepared by hydrothermal treatment method using silica and a structure-oriented agent (CTRB), with a molar ratio of Silica:CTAB is 1: 0.5 with a chang in the aluminum ratio so that it was (0-10-20)% . The results showed that the changing of alumina ratio was affected notely on the prepared structures. Whereas, the specific surface area was decreased from 874.0 to 329.7 and 88.9 m²/g when the alumina ratio 0,10,and 20% respectively, and the total pore volume decreased from 0.63 to 0.35 and 0.24 ml/g according to alumina ratio 0,10,and 20% respectively. The pore radius increased from 14.4 to 21.5 and 53.7 ºA for alumina ratio 0,10,and 20%, while . The pore volume distribution was decreased from 28 for alumina ratio 0% to 12% for both alumina ratio 10 and 20%. While a convergence was observed in the spectra of XRD diffraction, and infrared spectra (FT-IR) with a slight difference as the shift of the peak or disappearance of the other with the increase in the molar ratio of aluminum..

The Effect of Harmonic Distortion in Capacitive and Inductive Loads on the Performance of Electrical Grids in Huge Projects (FADEN Spectrum Phenomenon - an example)

2023-09-15T20:17:26+00:00

This research deals with the study, analysis and treatment of a strange phenomenon that suddenly appeared during the installation of a huge screen belonging to FADEN Spectrum Company on one of the huge towers in the city of Al-Khobar in the Kingdom of Saudi Arabia with area of 2000 m2, consisting of 2000 cabins and feeding 2000 cells, each cell having an area of 1 m2.

This phenomenon includes two things: The first is the appearance of an annoying noise emanating from the main feed box (MDB), and the noise increases exponentially with the increase in lighting intensity to become a noise of 90 dB at 60% illumination and 155 dB at 100% illumination.

As for the second, most surprising thing, it is the cables getting hot at a point that exiting from the panel ceiling only, where the temperature reached #83C, noting that the cables before and after this point were not affected by this temperature at all, so that temperature was #28C before the entry point, and the same temperature after the exit point, while the iron metal of the panel ceiling was clearly affected, that also recorded #83C.

Preparation and study of the common oxide system Al2O3/Fe2O3 and the effect of the directing agent (polyethylene glycol) on the properties of the tissue structure

2024-02-04T04:09:22+00:00

In this work, the mixed oxide was prepared in reactive proportions by hydrothermal method. The samples have been treated at temperature 110 ^oC for 7 hours. The effect of the amount of directing agent (polyethylene glycol) on the specific surface area value of the prepared samples was studied. The highest value of the specific surface area was 378.0 m²/g at molar ratio without directing agent. when prepared by the dry method at a ratio of without directing agent using ammonium bicarbonate as a precipitating agent.

Using amount of directing agent(g) the specific surface area decreased to 132.9 m2/g for the sample ,p(0.10g). when The amount of directing agent was increased the size of the mesoporous was increased, and the specific surface area ( increased to maximum 325.9 m²/g for the sample ,p(0.4g(

A study of the effect of Mueller matrices and Stokes vectors on calculating the polarization parameters of the linear, circular, and elliptical light field.

2023-09-30T23:09:44+00:00

In this research, the polarization equation was extracted, the Stokes vectors were defined, and we performed the appropriate transformations of the optical field components in a form consistent with the Mueller matrices for polarization. We determined how to calculate the components of the matrix, which in turn determine the state and type of polarization. We demonstrated the importance of this study in calculating and knowing the optical properties such as photo activity and refractive index. The theoretical results were compared with the available and recent experimental results

A Study of the Geological & Geo – Engineering Environments to Balouta Dam in Tartous

2023-12-17T08:54:30+00:00

The research shows the lithological and geo – engineering properties of the dam axis
and the penetration along this axis, and the dam lake. The research also localizes the geological units, which differ in its geo – engineering properties, during rocks cors study and surface samples therefore have shaped non- penetrating, thus, these units were classified according to their influence in two basic ranges:

Penetrating strip on the right shoulder of the dam, the thickness is 5 m and at depth 10 m, thickness decreases in the direction of the dam axis. Under this strip there is un-penetrating dolomite marl limestone.

Moreover, as a result of the study of the physical and lithological properties of the
rocks forming the dam shoulders, don’t allow large water loss.

Conversion of Apricot Kernel Oil into Biodiesel Using Alkaline Catalysts

2023-10-05T06:59:58+00:00

Biodiesel is a clean - burning alternative fuel source that can be produced from animal fats, vegetable oils, and algae oil. This research deals with the production of biodiesel from apricot seeds oil, which is a rich source of oil. The oil was extracted from apricot seeds by maceration using n-hexane as a solvent. Biodiesel was prepared by the alkaline catalyzed transesterification method, and the reaction yield reached 86.3 % at the reaction conditions: molar ratio of oil: methanol ( 1:6 mol/mol), the amount of catalyst (0.5 wt % of the weight of the oil), reaction temperature 65 °C over 90 minutes. the physical and chemical properties of the prepared biodiesel were studied , and they confirmed the American (ASTM) and European (EN) Standards. In addition, The combustion test of the prepared biodiesel was carried out and the results were discussed.

An Investigation In The Inclucion Theorem Which Related To Lorentz Spaces

2023-09-11T12:01:58+00:00

In this paper, we studied a problem at functional analysis, it is the inclusion of function spaces, especially we studied the inclusion between Lorentz space type (r,p,q), In the beginning, we introduced this space and then, we studied some of its basic properties where we proved that it is non-empty, linear, quasi-normed and complete space, then we proved the inclusion of this space for different cases of the parameters, First for1≤q_1≤q_2<∞ , then for 0≤r_2≤r_1<∞ ,
after that for 0≤r_2≤r_1<∞ & و1≤q_1≤q_2<∞ at the same time.
In addition to some other inclusion cases.
Then, we proved one of the cases of inclusion between these spaces and bounded stummel modulus classes type (r, q,α).

Estimation of the Peak Discharge in the Arab River basin in Lattakia, Syria by the modified experimental Talbot method TMT

2023-11-12T04:05:25+00:00

The lack of continuous hydrological records is one of the biggest challenges in managing surface basin water resources, especially when studying floods and the water installations. Therefore, many hydrological researchers applied experimental equations to estimate the peak flow values, as a basic parameter that plays a key role when establishing water projects in the absence of hydrological measurement stations. The modified experimental Talbot method TMT is one of the most famous of these equations, which was applied in this study to estimate the peak flow values in the Arab River basin using GIS software and building purpose maps (geomorphological coefficient, slope, shape, drainage …) and processed to obtain a map of the distribution of the estimated peak flow values, It was found that it ranged on average between (2.5 m³/s) with a return period (5 years) and a maximum of (30 m³/s) with a return period (100 years), The study also showed that the higher values of the estimated flow peak are concentrated in the recharge area in the Arab River Basin, while the lower values are concentrated in the drainage area, which reduces the possibility of flooding.

A study of using stable alpha distributions to denoising images (stable Gaussian distribution for α =2)

2024-03-25T04:31:39+00:00

In this work, we study the stable Alpha distributions, which are a rich class of probability distributions and for their importance entered into denoising images with the Daul-tree complex Wavelet Transform DT_CWT.

We present the wavelet transform method of characteristic functions of stable distributions for α=2 (Gaussian distribution) and moreover the maximum a posteriori estimator(MAP)method applied to estimate the parameters resulting of the Wavelet Transform of the characteristic function.

The function resulting from the wavelet transform , parameters and images were added to the noise which were implemented in MATLAB using the Peak Signal to Noise Ratio(PSNR). The test showed the effectiveness of our method by denoising of the resulting images, and the results of numerical comparisons with Cauchy distribution[9] and Bivariate distribution by Sendur and selesnick [11] and BM3D to the importance of our results in terms of their approach to the results of BM3D.

Effect of the hydrothermal treatment and amount of structure directing agent on the surface properties for SBA-15 mesostructure

2023-07-30T14:24:41+00:00

Six samples of SBA-15 mesostructure were prepared. Process was proceeded with constant amount of TEOS, at different temperatures (70,100 and 130 Cº) using different amounts of P123 as structure directing agent (SDA).

Results showed that both, the temperature of the hydrothermal treatment and the amount of (SDA) clearly affect on isothermal adsorption curves and the all pore structure factors. When the mass of SDA was 23 m.mol at different temperature (70,100,130 Cº) the specific surface area was 640,734 and 382 m²/g respectively.

Where at constant temperature 100 Cº and different mass of SDA (23, 46, 69 m.mol ) the surface area was 734,852,832 m²/g respectively .The distribution of pore volume also was changed.

Extraction of lanthanum (III) ion from aqueous solutions using Formazan reagent by liquid-liquid method

2023-07-30T14:22:13+00:00

The current study included a liquid-liquid extraction of the trivalent lanthanum ion by means of the reagent ((3,1-diphenyl-5-(p-nitrophenyl)formazane)), and the effect of various factors was studied on the percentage of extraction and the extraction coefficient, including the pH of the medium. , Mixing the two phases, the concentration of the studied ion, and also the effect of the presence of some competitive positive ions, and the effect of the extraction process in batches, in addition to studying the effect of the ratio of the organic phase to the aqueous phase.

The results of this research showed that the best equilibrium time was at 90 minutes, and the best PH degree was at PH = 5. As for the extraction process in batches, the results showed that it was not very effective, so it was better to extract in one batch to save effort and time.

The value of the distribution coefficient and the transition ratio increased with the increase in the concentration of the lanthanium ion in the aqueous phase, and this behavior was expected due to the continuous interaction between the ions and the formazan. As for the effect of the presence of some positive ions competing for the lanthanium ion, the greatest effect was the triple chromium ion (Cr³⁺).

In general, and through the results of the research, it is noted that the formazan reagent can be used effectively in the process of extracting ternary lanthanum from aqueous solutions, and later used in extracting it from real samples such as solutions resulting from phosphates and phosphogypsum

Preparation and Characterization of high surface area material from natural Syrian zeolite TS-7

2023-07-30T14:13:38+00:00

The porous silica Si- TS-7 has been prepared from Syrian natural zeolite TS-7. Natural zeolite was treated with hydrochloric acid 10%wt for 24h at 20^oC. The product was filtered to remove the precipitate. Filtrate has been used to produce solid base in previous work. The precipitate has washed with distilled water and dried at 110^oC for 24h and calcined at 500^oC for 4h. The resulted material Si-TS-7 was characterized by TG-DTA and FTTR, XRD BET methods. The results showed that the Si-TS-7 consist of silica mainly. Textural properties study showed that the adsorption isotherm belongs to type IV according to the classification of Singh and colleagues, which is characterized by the presence of a hysteresis loop that indicates the presence of the phenomenon of capillary condensation and presence of high specific surface area of 412m²/g compared to crude zeolite.

Determination of the concentrations of some organophosphorus pesticides in the muscle tissue of exotic fish (Siganus rivlatus) spread on the beach of Latakia city

2023-09-30T22:26:33+00:00

This research focused on determining the concentrations of some organophosphorus pesticides in the muscle tissue of exotic fish (Siganus rivlatus) in five different areas of the coast of Latakia city (northern estuary of the Kabir River, Marfa, Afamia, Sports City and Sakiet Musa) in winter 2023.

A significant increase in the total concentrations of organophosphorus pesticides was observed in fact significantly affected by wastewater and agricultural activities, commercial activity at the port site (6895 ± 35.12ng/g), the northern estuary of the Kabir River (3243.71 ± 32.1ng/g), the Apamea site (1161.62±34.67ng/g) and the Sakiet Moussa estuary site (774.41 ± 33.75ng/g) in increasing their concentrations in the muscle tissues of sandy exotic fish compared to the Sports City site (169.75 ± 29.38ng/g) relatively far from sources Direct pollution.

The results showed a high values of the standard deviation coefficient between the fish of each site on the one hand, and between the fish of different sites on the other hand, which can be attributed to the effect of both the feeding pattern (herbivorous fish), in addition to the different morphological characteristics of the studied fish (height and weight) and the age of the fish in the different concentrations of these pesticides, This was confirmed by the strong correlations between concentrations and the length and weight of the fish studied.

The accumulation of organophosphorus pesticides across the food chain in the muscle tissue of the sand exotic fish (Siganus rivlatus) being lipophilic has negative consequences on fish on the one hand, in addition to the negative effects on the top of the pyramid in this food chain, which is human, which leads to serious diseases and significant negative effects on it.

Studing the luminescence and excitation of Calcium Fluoride and matching it with computer.

2023-08-19T19:06:05+00:00

Calcium fluoride was prepared using the chemical precipitation method, The absorption spectrum was taken with a methanol dispersion

The oscillator strength of the vibrator was calculated for the possible transitions by matching the experimental absorption spectrum with the theoretical spectrum, assuming that the spectral line shape is Gaussian and the number of spectral lines of the absorption spectrum is seven lines, a decoupling of the experimental absorption curve was made, and then the wavelengths corresponding to the most probable transitions were found.

The emission spectrum of the prepared sample was taken at an excitation length of 300 nm and an emission peak was observed at the wavelength of 400 nm.

Studying the Nature of Recent Marine Sediments on the Accumulation of Cadmium and Lead in Latakia and Baniyas Shore

2023-11-12T04:08:41+00:00

This research based on the determination of some trace heavy metals (Lead (Pb), cadmium (Cd)), in different types of recent marine sediments and studying their grained isolation along different zones of Latakia and Baniyas shore area during summer period of 2022 using (Atomic Absorption Spectrometry: AAS).

Moreover this research aimed to determine the correlation between The following factors, quality and nature of the sediment also the effect of the grained particle diameter on the change of these concentrations. The results indicate that there is a significant correlation between the change in the concentrations of the studied metal elements (lead (Pb) and cadmium (Cd)) and the nature and quality of the sediment, where it was observed almost complete dominance of sands, moderate isolation, and with a very negative slope in the shore of Latakia city, which indicates relatively moderate energy conditions compared to the predominance of gravel sands, with poor sorting, excessive and with a very negative slope, which indicates high energy conditions in Baniyas beach.

Study of the Effect of Various Human Activities on the Distribution of some Organophosphorus Pesticides in the Marine Waters of the Coast of Lattakia ity

2023-06-26T13:56:00+00:00

This research focused on the determination of the concentrations of some organophosphorus pesticides in five different areas of the coast of Latakia city (northern estuary of Nahr al-Kabir, Al-Marfa, Afamia, Sports City and Sakiet Moussa) using gas chromatography technology related to spectrometry gaschromatography/MS (GC/MS).

The results showed that the total concentrations of organophosphorus pesticides were significantly higher in the marine waters of the port site (111.115μg/l) and the northern mouth of the Kabir River (39.899μg/l), with the lowest values recorded at the Sports City site (1.158μg/l). Diazinon recorded the highest values in the harbor area (71.802μg/l), and Dimethoat in the northern estuary of the Kabir (26.592μg/l).

It was noted that the Sports City area is the least studied area of concentrations of these pollutants compared to various other studied sites, while the diversity is great in the number of vehicles.

Study the effect of temperature and shear stresses on flow behavior Polylactic acid - polystyrene (PLA/PS) molten mixture

2023-06-26T14:45:53+00:00

In this research, we have studied the rheological properties of samples of PLA / PS mixtures under the influence of high shear stress and different temperatures, where mixtures were prepared in proportions ranging from 10% to 100%. The mixtures (mixtures) were prepared in preparation for the tests in the viscometer Then study the viscous properties by determining the viscosity and viscous activation energy (E) at constant shear stress, constant shear rate and through Newton's index (n).

The real viscosity transformations were also studied in terms of the inverse of temperature to determine the activation energy at constant shear stresses and constant shear speed, as the activation energy is useful in determining the sensitivity of the polymer's viscosity to temperature change.

The elastic properties of the studied mixtures were also studied using Barus technology, and it was found that the rate of swelling increases with the increase in shear stress, and it was found that there is no significant effect on the swelling coefficient B.

Quantum mechanical investigation of the Mechanism of Nickel-Catalyzed Cycloaddition Reaction of 3-azetidinone with Alkynes

2023-08-19T19:04:23+00:00

The reaction mechanism of the 3-azetidinone with nickel-catalyzed alkenes was studied using the function M06-2X with two basis sets: def2-TSVP and LANL2DZ for the nickel atom with two basis sets def2-SVP and 6-31G(d) for the main elements atoms. The computational results indicate that the reaction takes place through two independent pathways, one of which is linked by the coordination of 1-Boc-3-azetidinone on the Ni(0) center to form an intermediate state that includes the Ni–C(O) bond, then the insertion of the alkyne to the Ni–CO bond (pathway 1), As for pathway 2, it is related to the coordination of the 1-Boc-3-azetidinone on the Ni(0) center to form an intermediate state that includes the Ni–C(sp3) bond, and then the insertion of the alkyne to the Ni–C(sp3) bond.
Analysis of the global nucleophilic and electrophilic indices of the reagents indicates that the nickel complex shows a strong nucleophilic role, while the compound 3-azetidinone shows an electrophilic role, and that the reaction is polar in its nature. In addition, the local electrophilic and nucleophile indices of the reactants indicate that the nickel atom in the complex is the most nucleophilic center, while the carbon atom C(=O) in the compound 3-azetidinone is the most electrophilic center, and thus, pathway 1 More likely than Pathawy 2. The computational results of our studies are consistent with previous research with the exception that the mechanism proceeds through two independent pathways; That is, there are no common transitional or intermediate states in the two pathways, and this contradicts what was indicated in previous computer studies