المنشورات العلمية لـجامعة طرابلس

احصائيات منشورات جامعة طرابلس

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Residual Bromate Assessment in Bread Samples from Tajoura city bakeries, Libya

A total of 25 randomly purchased bread samples were analyzed in this study from 25 different bakeries in Tajoura city. Bread in Libya is highly consumed among all socioeconomic groups; it is mainly consumed in breakfast, dinner and school meals. Potassium bromate is the most popular additive used in bakery industry worldwide. Bakeries in the US used Potassium bromate as bread improver since 1914 to increase bread volume and texture and improve bread production. The main aim of this study is to assess the safety of bread by the measurement of residual potassium bromate using a rapid and reliable method and to investigate the level of compliance to the ban fourteen years later. This method is based on the reaction between bromate and iodide in acidic medium to produce iodine (I2). The absorbance of I2 was measured spectrophotometrically at 488nm. The calibration curve was linear (R2=0.9996) over the range 1.0 – 5.0mg/L of potassium bromate. Despite the ban of potassium bromate in Libya since 2005 due to its classification as a potential carcinogen it is still detected in local bread loaves. All samples showed high levels of potassium bromate to be 300 to 1333 more than the permissible level set by the American Food and Drug Administration (FDA) which is highly toxic for consumers and could threaten their health over prolonged regular consumption. A continuous pursuance and implementation of the ban on use of potassium bromate in baking industry in Libya is recommended. arabic 11 English 67
RAGIAB ALI MOKHTAR ISSA(1-2020)
موقع المنشور

Growth measures of Libyan goat breeds and their crosses

Egyptian Journal of Sheep and Goat Sciences, (2010) 5(1): 93-100 Growth measures of Libyan goat breeds and their crosses Hermas, S.A.; Ahtash, A.E. and Majid, A. This study was conducted at Bier-Alghanem Experiment Station, 80 km. south west Tripoli. The aim was to assess the growth traits of local breeds ; Mahali (M), Targhi (T), Tibawy (Tb); imported breeds; Cyprus Damascus (D) , Murciano Granadina (S), reciprocal crosses of Local Breeds and crosses of Mahali breed with imported breeds. Traits studied included birth weight (BW), weaning weight (WW), yearling weight (YW) and daily gain until weaning (DGW). Analysis of variance (SAS GLM) was used to analyse the data. The model included: year, type of birth, sex and breed or type of crossing where all managed as fixed effects. The results indicated significant effect of year,sex and type of birth (P< 0.05). Local breeds showed no significant differences in preweaning traits but post weaning traits were significantly different (P< 0.05). The reciprocal crosses of local breeds and those of Mahali with imported breeds showed differences indicating maternal and genetic and maternal effects. Large variation within the crosses indicated differences within each breed and that selection within pure breeds could improve the crosses. Key words: goat breeds, crossing, improvement. arabic 8 English 47
Hermas S.A., Abdulkarim E. Ahtash, Majid A. F.(10-2010)
موقع المنشور

Goat production in Libya

Desert Research Center Ministry of Agriculture, Egypt (DRC) Proceeding workshop on Recent Advances in Goat Production under Arid Condition. Cairo, April 10-13 (2006)/ p.p. 303-308 United Nations Food and Agriculture Organization (FAO) Goat Production in Libya Ahtash, A.E. Libya is located in middle north of Africa; their area estimation was about 1.6 million km2. Mediterranean climate characterize the coastal region; however, the climate will changed to desert condition as we go to the south. Great variation in climate temperature between winter and summer which ranged from 0 to 40 C°. Libya is considered to be within arid and semi-arid region which characterized by shortage and fluctuation of feed availability that is required to provide the feed requirement for the existence number of livestock. This resulted in low growth performance of animal production in this country. Goat population in Libya ranged between 1.5-2 million heads, 90% of this number represents the local goat breed (Mahali) and were wide spread on the coast region. The rest 10% were concentrated in the south area and called Tebawi, Targi and Kurdi. Libyan goats were distributed in three different regions, 44% in the west region, 21% in the middle region, 33% 33% in the east region and 2% in the south region. arabic 3 English 21
Abdulkarim E. Ahtash(4-2006)
عرض موقع المنشور

Carcass Characteristics of the Libyan Purebred Mahali Goat and their crosses with Damascus and Morcia Granada Goat

Agricultural and Marine Sciences, 15: 21-27 (2010) 2010 Sultan Qaboos University Carcass characteristics of the Libyan purebred Mahali goat and their crosses with Damascus and Morcia Granada Goats. Ahtash A.E., Biala A.s., Magid M.F. and Marhoun H.M. This study was conducted to evaluate the Carcass characteristics of Mahali (M), Damascus (D) and Morcia Granada goats and their crosses. Live weght, carcass weight, dressing-out %, rib eye muscle area, non-carcass component and kidney fat were measured. The results showed significant superiority of Damascus goats in live weight (65.8 kg), carcass weight (34.3 kg), dressing-out % (52.1 %), rib eye muscle areas (22.7 cm2) over the Mahali and Morcia Granada goats. The crossbred group ( ½ M x ½ D) was superior in live weight (50 kg), carcass weight (24.2 kg), dressing-out % (48.4%) and rib eye muscle area (21.2 cm2) over other crossbreds. The crossbred group (¾ D x ¼ M) was superior in live weight (61.7 kg) carcass weight (31 kg) and rib eye muscle area (21.3 cm2) over the other ¾ crossbreds. This study indicated that crossing between Mahali x Damascus breed was beneficial for increasing live weight and meat production. Key words: Breeds, crossbreeding, carcass. arabic 16 English 98
Abdelkareem E. Ahtash, Abdulla S. Biala , Aiad F. Magid , Hamed M. Marhoun(5-2010)
عرض موقع المنشور

Climate Variability and Crop Production in Libya (North West Region)

Climate variability is considered as the most serious challenge threatens the ecosystem, whether in developing or developed countries. Climate variability affects the agro ecological and growing conditions of crops and livestock that may add significantly to the development challenges of ensuring food security and reducing poverty. In this study, the climate data for the period (1945-2010) was investigated to determine the manifestation of climate variability in the northwest of Libya and its effect on agriculture. The results indicate that the drop in rainfall volumes and irregular distributed over the season and temperature increasing over the study period are the most important consequences of climate variability in Libya, which has a negative influence on the country’s agriculture sector. Time trend of rainfall and temperature were analyzed and the impacts of climate change on agriculture were discussed. Moreover, Pairwise Granger causality test analysis were used to examine the causal relationship between climatic conditions in Libya. The results further indicate that there is an unidirectional relationship existed between changes in temperature and the production of dates and tomatoes, and unidirectional causality runs from rainfall to onion, potatoes olive and ground peanut.
Nagib M. said Froja, Khaled R. Elbeydi(12-2016)
عرض موقع المنشور

biometrics:standing throughout emerging technologies

Biometrics technologies have been around for quite some time and many have been deployed for different applications all around the world, ranging from small companies' time and attendance systems to access control systems for nuclear facilities. Biometrics offer a reliable solution for the establishment of the distinctiveness of identity based on "who an individual is", rather than what he or she knows or carries. Biometric Systems automatically verify a person's identity based on his/her anatomical and behavioral characteristics. Biometric traits represent a strong and undeviating link between a person and his/her identity, these traits cannot be easily lost or forgotten or faked, since biometric systems require the user to be present at the time of authentication. Some biometric systems are more reliable than others, yet they are neither secure nor accurate, all biometrics have their strengths and weaknesses. Although some of these systems have shown reliability and solidarity, work still has to be done to improve the quality of service they provide. Presented is the available standing biometric systems showing their strengths and weaknesses and also emerging technologies which may have great benefits for security applications in the near future.
Abdulmonam Omar Ahmed Alaswad(1-2020)
موقع المنشور

Vulnerabilities of Biometric Authentication “Threats and Countermeasures”

Biometric systems have a powerful potential to provide security for a variety of applications, systems are nowadays being introduced in many applications and have already been deployed to protect personal computers, Banking machines, credit cards, electronic transactions, airports, high security institutions like nuclear facilities, Military Bases and other applications like borders control, access control, sensitive data protection and on-line tracking systems. While biometrics may improve security in different environments and serve many purposes, biometric systems, like any other security system, have vulnerabilities and are susceptible to threats. they are susceptible to external vulnerabilities of biometric systems so that their weaknesses can be found and useful countermeasures against foreseeable attacks can be developed The increasingly high profile use of biometrics for security purposes has provoked new interest in researching and exploring methods of attacking biometric systems.
Abdulmonam Omar Ahmed Alaswad(1-2020)
موقع المنشور

Most Common and Reliable Traits for Fusion of Biometrics

Biometrics technologies have been around for quite some time and many have been deployed for different applications all around the world, ranging from small companies' time and attendance systems to access control systems for nuclear facilities. Biometrics offer a reliable solution for the establishment of the distinctiveness of identity based on "who an individual is", rather than what he or she knows or carries. Biometric Systems automatically verify a person's identity based on his anatomical and behavioral characteristics. Biometric traits represent a strong and undeviating link between a person and his identity, these traits cannot be easily lost or forgotten or faked. Since biometric systems require the user to be present at the time of authentication. Some biometric systems are more reliable than others, yet biometric systems are neither secure nor accurate, all biometrics have their strengths and weaknesses. Although some of these systems have shown reliability and solidarity, work still has to be done to improve the quality of service they provide. In this paper we present the most common and reliable known biometric systems suitable for Multimodal Biometrics Fusion, providing highly efficient and secure systems, showing their strengths and weaknesses and also presenting technologies in which may have great benefits for security applications in the near future.
Abdulmonam Omar Ahmed Alaswad(1-2020)
موقع المنشور