النشر العلمي

  • Screening of guava genotypes for natural infestation of fruit flies (Diptera : Tephritidae) in River nile, Sennar and North Kordofan States, Sudan

The infesting species and their infestation indices of fruit flies were determined  for  guava  genotypes (Psidium guajava L.), grown  in  River Nile, Sennar  and North Kordofan  States  during the period from June to August 2010. Twenty genotypes were selected from each state to be evaluated, where ten  mature  fruits from each  genotypes   were harvested randomly  from insecticide unsprayed trees.  Fruits were brought to the laboratory and placed in individual plastic vials containing sand at the bottom to obtain the pupae. Infestation indices were estimated by means of total number of pupae/fruit. Pupal viability was then calculated based on the percentage of pupae resulted in fly emergence. Data was analyzed using analysis of variance and Duncan multiple range test for mean separations. Results showed that Guava fruits were infested by four fruit fly species Ceratitis cosyra, C.quinaira, C capitata and  Bactrocera dorsalis constitute (82.2), (0.8), (16.7), (0.3% ) and 28.35 ,0.01 ,10.1 and 61.56% in River Nile and Sennar States respectively. While in North Kordofan State guava fruits were infested by C.cosyra, C.capitat and B.dorsalis 98.4, 0.4 and 1.2% respectively. All the evaluated genotypes in River Nile and Sennar States were infested by the fruit fly with varying degrees only two genotypes 15 red flesh fruit and 19 white flesh fruit in Kordofan State were found free from fruit fly infestation. Infestation was much higher in Sennar and River Nile states (32 and 29 pupae/fruit) respectively compared to North Kordofan (1.6 pupae/fruit).The higher infestation rate occurred in ripe guava fruits (33) compared to 18 and 6 pupae/fruit in mature green and immature green fruit respectively.

Key words: Fruit fly- Guava, Screening-Sudan.

published in International Journal of Environment Agriculture and Biotechnology (IJEAB)

  • Mechanical Properties of Poly (ε-caprolactone)/Polyethylene Terephthalate Composite Prototype Small Diameter Vascular Graft

The purpose of the vascular grafts or implantation is not only to keep a patient alive, but for the patient to continue with their normal lives. Polyethylene terephthalate (PET) has been successfully used in large diameter grafts; unfortunately, small diameter grafts were failures. Due to surface forces, blood plasma proteins are adsorbed by the graft, resulting vessel reclosure. Poly (e-caprolactone) (PCL) is a promising biodegradable polymer with a longer degradation time. The mechanical properties of the pure PCL membrane cannot meet the requirement. The aim of this study is to develop new vascular graft from PCL reinforced with PET monofilament weft-knitted tube fabric. The PET fabrics were knitted using small single jersey knitting machine. Then PCL solution was coated outside and inside of the weft-knitted fabric with a PTFE rod, and the pure PCL tube was taken as a control. The samples were dried by freeze drying method. The results have shown that the new vascular grafts have good porosity. In addition the tensile properties, elastic recovery and the suture retention strength of the new prototype vascular grafts were improved compared with pure PCL vascular graft, which could be used in clinical application.

published in 2012 INTERNATIONAL FORUM ON BIOMEDICAL TEXTILE MATERIALS, PROCEEDINGS

  • Introducing Existing Research Collaboration Anethesiology & Emergency Medicine: Joint Talk with Halle-Wittenberg University

published in COSIMENA

  • Influence of High Mud Volume On Vacuum Filter Performance A case Study- Elguneid Sugar Factory, Sudan

Influence of High Mud Volume On Vacuum Filter Performance A case Study- Elguneid Sugar Factory, Sudan

Salma B. Mohammed, kamal S. Hassn, Elamin A. Elkhalifa

 

Abstract

 

Elguneid Sugar Factory is designed for manual harvesting cane but the field labor has become scarce and wages for field work is very high. For this reason, Elguneid Sugar Factory has introduced mechanical harvesting; therefore there was an increase in the ratio of mud which enters to Elguneid Sugar Factory. This study aimed to know the influence of high mud level which resulted from mechanical harvesting on the efficiency of Rotary Vacuum Filters. The experimental tests were carried out on the Rotary Vacuum Filters of Elguneid Sugar Factory. The filter dimensions were calculated and found to be 6096 mm length, 3658mm Radius and 174m2 total filtering surface areas. The Rotary Vacuum Filters were tested under different speeds varied from 7.5-12cycle/hr.The low vacuum was 361.2mm Hg, and 412.8mm Hg for high vacuum. Washing water temperature was found to be 81oC and quantity of bagacillo for each crushed tone of cane was found 13Kg/hr. The thickness of filter cake ranged between 3.5-5.2mm which decreased with the Rotary Vacuum Filter Speed (RVFS). In this research work it was found that sucrose in filter cake ranged between 1.39-2.21%, which increased with RVFS. Also it was found, that moisture content of filter cake ranged between 60.8-62%. The increase in moisture was dependent on RVFS increase. The mud quantity was calculated and found to be 133.63-147.87Kg/hr.The filter retention was calculated and found to be 7.2% and this considered very low when compared to the international standard which was 70% as average. All these results showed that the rotary vacuum filters in Elguneid Sugar Factory has a bad performance for removal of the increasing mud level.

 

published in Gezira Journal of Engineering and Applied Sciences

  • Investigation into The Filterability of Raw Sugars from Different Geographical Regions of The World

Investigation into The Filterability of Raw Sugars from Different Geographical Regions of The World

Kanada . T. Korea, Kamal Suleiman, Amin Yousif Mohammed, Omer Ahmed Elobeid

 

Abstract

 

This  study  was  carried  out  at  Al khaleej  Sugar  Refinery  in  Dubai, United   Arab   Emirates.  The  study  aimed  to  find  out  the  correlation  between  the  filterability  and  slurry  resistance  values  of   raw  melt  liquor  in  the  carbonation sugar  refinery  and   the  raw  sugar  quality.

The investigation utilized 5 raw sugar samples collected from various regions of the world comprising three quality groups namely; Low Pol sugar (LP) from Thailand, Very High Pol sugar (VHP)   from  Brazil , South-Africa , Sudan , India , and  Very  Very High Pol  sugar ( VVHP )    from  Brazil.

published in Gezira Journal of Engineering and Applied Sciences

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