https://scholar.ptuk.edu.ps/handle/123456789/40 2026-04-29T15:34:50Z 2026-04-29T15:34:50Z Abu-Asad, Ata Asad, Jihad https://scholar.ptuk.edu.ps/handle/123456789/1068 2023-08-13T08:11:10Z 2023-07-28T00:00:00Z

Title: Power series approach to nonlinear oscillators Authors: Abu-Asad, Ata; Asad, Jihad Abstract: In this article, we introduce a nonlinear oscillator equation containing two strong linear terms. An approximate solution was obtained using power series approach. Furthermore, by introducing a parameter to the original equation, we fined the fixed points of the modified nonlinear oscillator equation and study stability analysis of these fixed points. On the other hand, we simulate the solution of the nonlinear oscillator equation and introduced many plots for different initial conditions. Finally, we make some plots concerning the phase portrait for different cases.

2023-07-28T00:00:00Z Khal, Sahar Affoni, ida Iter, Nuha https://scholar.ptuk.edu.ps/handle/123456789/1065 2023-07-24T07:23:45Z 2022-07-07T00:00:00Z

Title: مشكلات مدارس التعليم المهني في محافظات شمال فلسطين وسبل التغلب عليها Authors: Khal, Sahar; Affoni, ida; Iter, Nuha Abstract: Abstract: The study aimed to identify the problems of vocational education schools in the northern governorates of Palestine and ways to overcome them, and to achieve the objectives of the study, the researchers used the qualitative approach, and used focus groups and interviews as tools for the study. With equipment and devices, the inferior view of vocational education by society, lack of awareness, lack of experience, low student achievement, inconsistency of curricula with modern developments and student levels, and for the development of vocational education schools, the results recommended the necessity of providing a budget, providing equipment, increasing the number of schools, providing equipment and devices, activating the role of educational media in educating the community about the importance of vocational education, and sending missions of teachers abroad. The study recommended providing concerns, developing curricula and enhancing the role of educational media Keywords: problems; vocational education schools; northern governorates.

2022-07-07T00:00:00Z Samara, Rana Qubbaj, Tawfiq Scott, Ian Mcdowell, Tim https://scholar.ptuk.edu.ps/handle/123456789/983 2022-07-20T07:34:59Z 2021-07-02T00:00:00Z

Title: Effect of plant essential oils on the growth of Botrytis cinerea Pers.: Fr., Penicillium italicum Wehmer, and P. digitatum (Pers.) Sacc., diseases Authors: Samara, Rana; Qubbaj, Tawfiq; Scott, Ian; Mcdowell, Tim Abstract: The current study was conducted to evaluate the effect of eight Palestinian indigenous plant essential oils (EOs) under in vitro and in vivo conditions against Botrytis cinerea Pers.: Fr., Penicillium italicum Wehmer, and Penicillium digitatum (Pers.) Sacc., three common postharvest pathogens of tomato and strawberry fruits. In vivo tests showed that thyme, sesame and sage EOs exhibited high antifungal activity against B. cinerea on strawberry and tomato fruits, compared with rosemary, mint and eucalyptus. In vitro agar, disk-diffusion tests showed that B. cinerea, P. digitatum and P. italicum mycelium growth was completely inhibited when treated with clove and sage EOs caused 50% inhibition of B. cinerea and P. italicum mycelium growth. Fruit decay and fruit quality index values measured in total soluble solids and fruit flesh firmness showed that EO coated strawberries had significantly less fruit decaying and ripping compared to control, while EO coated tomatoes showed no significant difference compared to control. EO constituents fall into different chemical classes, including sterols, caffeoylquinic acids, flavonoids, terpenoids, coumarins, and acetylenes. Chemical analysis of the EO preparations using gas chromatography-mass spectrometry determined that the main components in sesame oil were octadecenoic acid-(56%) and hexadecanoic acid (26%), while clove oil consisted of eugenol (53%). In the other EOs, the principal compounds were: menthol (44% in mint oil), eucalyptol (37% in sage oil), while bornanone (18% in rosemary oil) and γ-terpinene (21% in thyme oil) were present at lower concentrations. The EO of sage plants could potentially be a useful alternative to synthetic pesticides to control post-harvest diseases and prolong the shelf life of fruit products.

2021-07-02T00:00:00Z Samara, Rana https://scholar.ptuk.edu.ps/handle/123456789/982 2022-07-20T07:34:36Z 2021-05-21T00:00:00Z

Title: Biological activity and chemical characteristics of essential oils from the indigenous plant in Palestine Authors: Samara, Rana Abstract: New pesticides based on plant extracts and essential oils (EO) are the modern approach to control insect pests and diseases and replacing synthetic pesticides. Therefore, a preliminary screening of nine indigenous plants containing essential oil for antifungal and insecticidal impacts on selected microorganisms and insect pests was evaluated during 2018-19 at Kadoorie Agricultural Research Center (KARC), Palestine Technical University. The biological properties of the plant extracts and EO were tested in vitro. Results showed that clove, thyme and eucalyptus oil significantly inhibited the growth of A. niger, B. cinerea, A. flavus, P. ultimum, P. digitatum and F. oxysporum 24 and 48 hr post-application. EC50 and EC90 values were significantly the lowest for eucalyptus, thyme then clove. LC50 and LC90 values against green peach aphid and two-spotted red spider mite were calculated from log-dose probit mortality regression. EO bioassay on aphid showed no significant impact of aphid mortality among all the EO, but a significant effect on the two-spotted red spider mites mortality. Mustard, sage and bitter-cucumber oil applications have high mortality on aphid, while mustard, mint and sesame oil application have high mortality on the two-spotted red spider mite. EO showed no significant impact on plant enzyme activities as in expression values of PPO and POX. The biological activity of the EO investigated on several microorganisms, and insect pests suggested that clove, eucalyptus and thyme showed the highest antifungal activities, while mint, mustard and sesame have the highest insecticidal and acaricidal activities.

2021-05-21T00:00:00Z