منصة إيفاد العلمية

الأمين الهادي الأمين أحمد

إرسال رسالة

التخصص: الغابات والمراعي

الجامعة: مركز بحوث الغابات والصمغ العربي / السودان

النقاط:

معامل الإنتاج البحثي

الخبرات العلمية

،العمل في مجال بحوث الغابات والصمغ العربي منذ العام 2003، 15ورقة علمية منشورة،التعاون مع الجامعات السودانية التعاون مع المجلات العلمية كمصحح

الأبحاث المنشورة

Anatomical Structure of Three Species of Lannea

المجلة: Acta Scientific Agriculture

سنة النشر: 2018

تاريخ النشر: 2018-03-06

The aim of this study was to examine the wood anatomical structures ofwood from three Lannea species grown in Sudan. Samples of wood were collected from different areas. Microscopic slides of wood samples were prepared to measure the size and percentage of wood cells. Analysis of variance was used to determine the differences in wood cells between different species. The results showed similarity timber from genus Lannea and there is not a big differences in quantitative structure of the three species of Lannea and it is got a medium wooden substance therefore it classified generally light wood.

Effect of Air Drying, Solar-Assisted Air Drying and Sticker Thickness on Mahogany (Khaya senegalensis) Wood

المجلة: Forest Research Open Access

سنة النشر: 2015

تاريخ النشر: 2015-05-11

This study was conducted at Elfaid Um Abdalla saw-mill in Southern Kordofan State to improve Mahogany timber quality by improving air drying process. 6.25 cm thickness lumber boards of 210 cm length were prepared and stacked using three thicknesses of stickers (2.5, 3.75, 5 cm) and replicated three times for each sticker under shade and under direct sun light. This was done to determine the effect of stickers and shading on drying rate and magnitude of defects that occurred during the drying process. Moisture loss was recorded every two days by weighting sample boards inserted in the center side of each stack. Data analysis was done using JMP statistical package. The study showed that there was no effect of the three kinds of stickers and shading on moisture loss during the drying process, while there was effect of shading and stickers on number of defects that are caused with the drying process. The study recommends using 2.5 cm sticker thickness and shading to decrease defects that are caused by drying

Effect of Different Rainfall Levels on Wood Structure of Acacia senegal (L.) Willd in Clay Plain

المجلة: Acta Scientific Agriculture

سنة النشر: 2017

تاريخ النشر: 2017-08-07

The aim of this study was to examine the effect of rainfall on wood anatomical structures of Acacia senegal (L.) Willd located in the clay soil. Samples of wood were collected from sites representing three rainfall (low, medium and high) conditions throughout the gum belt of Sienar and Blue Nile States. Microscopic slides of wood samples were prepared to measure the size and percentage of wood cells. Analysis of variance was used to determine the differences between wood cells from different sites affected by rainfall. The differences in rainfall isohyets in clay soil did not significantly affect the wood anatomical structures.

Effectiveness of Timber Solar Dryers in Reducing Drying Time and Drying Defects in Comparison to Air Drying

المجلة: Journal of Agricultural and Veterinary Sciences

سنة النشر: 2013

تاريخ النشر: 2013-08-16

An air drying shed and two green-house type of solar dryers of different designs were constructed at the Forest National Corporation sawmill at Suki town, Sennar State. Timber stacks in all three dryers consisted of 120 sunt (Acacia nilotica ) boards each stacked in 15 rows with 8 boards in each row..Three sample boards were selected in each stack for periodic measurement of moisture content (M.C.) and following the progress of drying in the three dryers. The three sample boards were placed at different levels of each stack. Each sample board was taken out at two days interval, weighed and returned to the stack. The dryblub and wet-bulb thermometer readings were recoded and relative humidity worked out for each dryer. The moisture content was also calculated at two days interval. The results obtained showed that the average temperatures in the two solar dryers were significantly higher than that of the air dryer (ambient temperature). This resulted in a lower average final M.C. and lower equilibrium M.C. in solar dryers than in the air dryer. Solar dryer with high collector (SH) was the most efficient of the three dryers, with average final M.C. of 10.7% and equilibrium M.C. of 6.7%. This was followed by the solar dryer with low collector (SL) with average final M.C. of 11.9% and equilibrium M.C. of 7.5%, and lastly the air dryer with average final M.C. of 13.8% and equilibrium M.C. of 9.2%... The drying defects observed included minor warping incidents in the form of bowing which was more pronounced in air drying than in the solar dryers.

Effect of soil type and rainfall on Acacia senegal (L.) Willd. Gum viscosity

المجلة: JOUR. OF NAT. RESOURCES & ENVIRON. STU

سنة النشر: 2013

تاريخ النشر: 2013-08-10

The aim of this study was to investigate the effects of site factors namely; soil types and rainfall on viscosity of gum Arabic from (Acacia senegal). Samples of gum arabic were collected from sites representing three main soil types viz (sand, clay and sandy clay or “gardud” under three rainfall (low, medium and high) conditions throughout the gum belt of North, South Kordofan and Blue Nile States. Gum viscosity was measured using a Brookfield Viscometer (MYR Viscometer – version L spindle 3 speed 200 RPM) and pHmeter. Analysis of variance was used to determine the differences in viscosity and pH of gums from different as sites affected by soils type and rainfall. Correlation and regression analysis revealed high average viscosity for gums produced under low rainfall conditions in sand and clay soils, as well as also in gardud soil under medium rainfall. Sand in medium rainfall, gardud in high rainfall and clay in medium and high rainfall produced low average viscosity gum with significant differences between them and the above mentioned main factors. The results also showed that there were no significant differences in pH for all gum samples obtained from different soil types and different rainfall levels. Regression analysis showed a linear relationship (R² = 0.87-0.99) between viscosity and concentration of gum Arabic from the different sites. According to the results of this study gum Arabic could be classified according to viscosity into high (80-85 cps) medium (69-70 cps) and low (<60 cps) viscosity.

Grade (Design) Stresses for Boswellia papyrifera (Gafal) Wood Grown in Blue Nile State. Sudan

المجلة: International Journal of Research Publications

سنة النشر: 2018

تاريخ النشر: 2018-11-08

Timber is a natural and very variable material affected by many factors. This makes it important to determine mechanical properties by standard methods using small clear specimens. As clear wood is not available for use, it is important to apply all the necessary reduction factors to reach design stresses for structural sizes and the appropriate duration of load. Unlike other Man-made materials wood is also an anisotropic material, ie properties differ in the different directions to the grain. Both static bending and compression parallel to the grain tests were carried out according to standard procedures. Test results gave short duration ultimate stresses for clear wood (without defects). The basic stresses for the two properties were derived first by using two reduction factors to the mean ultimate stresses from test results to cater for wood variability, safety and duration of load. The Factors influencing strength were studied for grading the timber according to the size of strength reducing defects. This was followed by assigning a strength ratio to each grade. Grade (or design) stresses were then calculated by multiplying basic stress by the strength ratio for each grade. These Results revealed that the basic stress for bending for gafal wood was 10.8 MPa and 13.6 MPa for compression parallel to the grain. Grade (design) stresses in MPa, for the two properties were as follows: Grade 1 For Bending For compression 8.64 10.53 Grade 2 Grade 3 Grade 4 7.02 8.55 5.40 6.58 4.32 5.26 These results indicate that gafal wood with its low density and low strength values can only be used for light constructions as columns and non-load bearing members in wood frame buildings. This procedure will be followed for structural timbers with higher strength which can be used for heavy constructions.

Gum Arabic (Acacia Senegal (L.) Willd) Viscosity in Relation to Rainfall and Soil Metal Ions

المجلة: JOURNAL OF FOREST PRODUCTS & INDUSTRIES

سنة النشر: 2013

تاريخ النشر: 2013-11-15

The aim of this study was to investigate the effects of site factors namely; soil types and rainfall on viscosity of gum arabic from (Acacia senegal) and relationship between gum viscosity and soil metal ions.. Samples of Gum Arabic and soils were collected from sites representing three main soil types viz (sand, clay and sandy clay or “gardud” under three rainfall (low, medium and high) conditions throughout the gum belt of North, South Kordofan and Blue Nile States. Gum viscosity and pH were measured. The soil samples analyzed to determined metal ions. Analysis of variance was used to determine the differences in metal ions, viscosity and pH of gums from different as sites affected by soils type and rainfall. Correlation analysis revealed high average viscosity for gums produced under low rainfall conditions in sand and clay soils, as well as also in gardud soil under medium rainfall. Sand in medium rainfall, gardud in high rainfall and clay in medium and high rainfall produced low average viscosity gum with significant differences between them and the above mentioned main factors. The results also showed that there were no significant differences in pH for all gum samples obtained from different soil types and different rainfall levels

Influences of Short Term Storability on Gum Arabic Properties

المجلة: ACTA SCIENTIFIC AGRICULTURE

سنة النشر: 2018

تاريخ النشر: 2018-12-14

Gum Arabic is valuable commodity. It could be affected by the different ways and conditions of handling such as extracting, cleaning and storing. So, this study aimed to explore the effect of storing on some gum Arabic properties (moisture content, ash, crude protein, polysaccharides, fibers, fats, viscosity and pH). The results showed there is no differences between the A. senegal and A. seyal gum properties during the different normal storage periods. There are further studies need in the effect of long term under different storage conditions and other properties.

Mechanical properties (bending and Compression stress) as a tool for grading stress of Acacai nilotica wood

المجلة: International Journal of Research Publications

سنة النشر: 2018

تاريخ النشر: 2018-09-23

The aim of this study was to determine the mechanical properties of Acacia nilotica (L.) Willd wood and classified the grades according to basic stress. Samples of wood were collected from Damazin which located in the Blue Nile States. Wood samples were prepared to measure the static bending and compression values. The Results showed that the ultimate basic stress for bending for Acacia nilotica wood was 234.86 MPa, 102.62 MPa for ultimate compression parallel to the grain. From the results obtained during this study, Acacia nilotica wood has higher average of bending stress and Compression stress and this property is recommend for using it for heavy construction, flooring, furniture, veneer, plywood, tool handles and railway sleeper production.

Physicochemical Investigation of Exudates of Albizia Amara Tree from South Kordufan State-Sudan

المجلة: Journal of Forest Research

سنة النشر: 2024

تاريخ النشر: 2024-01-05

The aim of this study was to investigate the physico-chemical properties of Albizia Amara gum. The gum samples used in the present study were obtained from South Kordufan State. The values obtained for the various physical and chemical properties were: Moisture content 7.81%, soluble fibre 0.13%, fat 0.197%, ash content 3.94% and protein 5.68%. The metal ions were determined (K, Na, Ca, Mg, Cd, Co, Pb and Zn), and the values are (1198.9 mg/kg), (22.97 mg/kg), (120.05 mg/kg), (1481.6 mg/kg), (0 mg/kg), (0.81 mg/kg), (0 mg/kg) and (0.9 mg/kg). The determination of the polysaccharides of the gum samples showed that the proportion of rhamnose (0.5541%), the proportion of arabinose (0.75075%), the proportion of galactose (0.65%) and the proportion of xylose and mannose (0%). The viscosity of the solution of 10% Albizia Amara gum is 25 cps at room temperature and a pH value of 4.18.

Relationship between Metal Ions in Gum Arabic (Acacia senegal) and the Mineral Contents in the Soil under Tree Stands in Different Rainfall Zones in Sudan

المجلة: International Journal of Recent Research in Life Sciences

سنة النشر: 2015

تاريخ النشر: 2015-12-01

The aim of this study was to determine the relationship between metal ions in the gum polymer and those present in the soil under the tree stands. Samples of gum arabic and soils were collected from sites representing three main soil types viz (sand, clay and sandy clay or “gardud” under three rainfall (low, medium and high) conditions throughout the gum belt of North, South Kordofan and Blue Nile States. Gum and soil samples were analyzed to determine metal ions. Analysis of variance was used to determine the differences in metal ions of gums from different sites under different soils types and rainfall. The differences in rainfall isohyets in different soil types significantly affected calcium, potassium and magnesium contents and there was no significant effect on sodium content. From gum analysis the soil types were not significantly different in magnesium and sodium content. The difference exists only on calcium and potassium content in sandy soil, while clay soils contain higher potassium ions. Rainfall levels gave no significant difference on gum minerals in different soils except magnesium in sandy soil and calcium in sand and clay soils.

Variation in Wood Structure of Acacia senegal (L.) Willd Under Different Rainfall Levels in Western Sudan

المجلة: Forest Research Research Open Access

سنة النشر: 2015

تاريخ النشر: 2015-04-10

The aim of this study was to examine the effect of rainfall on wood anatomical structures of Acacia senegal (L.) Willd located in the sandy soil. Samples of wood were collected from sites representing three rainfall (low, medium and high) conditions throughout the gum belt of North, West Kordofan States. Microscopic slides of wood samples were prepared to measure the size and percentage of wood cells. Analysis of variance was used to determine the differences in wood cells from different sites affected by rainfall. The differences in rainfall isohyets in sandy soil did not significantly affect the wood anatomical structures.

VISCOSITY OF SOME ACACIAS GUM AND RELATIONSHIP TO POTASSIUM CHLORIDE AND CALCIUM CHLORIDE

المجلة: J. Environ. Agric.

سنة النشر: 2020

تاريخ النشر: 2020-05-01

Background Gum arabic is a complex polysaccharide that has food, pharmaceutical and technical applications; its known uses go back about 5,000 years. The development of the processing industry over the last three years has resulted in increased domestic competition for raw gum, and in turn better prices paid to farmers as well as more value added captured in Sudan. This positive development comes at a propitious time as increased consumption of soft drinks and confectionary products, as well as rapid development of health and dietetic products is boosting the world demand for gum arabic. Methodology Brookfield viscometer was used to investigate the viscosity of gum solutions Acacia senegal, Acacia seyal and Acacia polycantha with potassium chloride (KCl) and calcium chloride (CaCl2) at different gum concentrations i.e. 10, 15, 20, 25, 30 and 35%, respectively. Results Interaction was found between salts and gum solutions for three species. As the gum concentration increased, a significant increase in viscosity values was observed for all gum mixtures. The addition of KCl and CaCl2 increased the viscosity of gum arabic solution. Conclusion Gum viscosity could be increased significantly by adding salt, particularly KCl.

Variation in wood structure of six Ficus species in Sudan

المجلة: Acta Scientific AGRICULTURE

سنة النشر: 2022

تاريخ النشر: 2022-07-07

The aim of this study was to investigate the anatomical structure wood of six species of the genus Ficus, which grown in Sudan, (Ficu sycomorus, Ficus glumosa, Ficus capensis, Ficus nitida, Ficus benghalensis and Ficus benjamina) and currently used for decorative purposes and shade. The stereological method was used for the quantitative description of cells wood. The study proved the great similarity in the anatomical structure of the wood among the species under study, Ficus. nitida has the largest diameter of the vessels, which differs significantly from the rest of the species except Ficus sycomorus. There are also significant differences between species on the fiber diameters, a horizontal mean free path between the vessel and the double cell walls thickness of the vessel and fiber, while there are no significant differences in the rest of the anatomical structures. From the results, the differences in wood anatomical can be used to determine the quality of wood for Ficus species grown in Sudan.