A floristic survey of Sedrores Al-Qawasim mountains in Gharyan district - Libya was conducted in two consecutive growing seasons from 01/04/2018 to 01/6/2019. In this study area, a total number of 320 plant species belonging to 214 genera were collected representing 44 families, of which 39 families and 276 species belonging to dicotyledons, and 5 families and 44 species are belonging to monocotyledons. The results showed the dominance of the family Asteraceae with 60 species, followed by the family Fabaceae with 32 species, then the family Poaceae with 29 species. The results showed the dominance of the (Euphorbia genus) with 7 species, followed by Helianthenum, Plantago and Erodium with 6 species each. Moreover, life-form spectrum analysis showed the predominance of therophytes with 210, followed by Hemicryptophytes with 59 species, while chorotype spectrum analysis showed the dominance of Mediterranian species with 151 species, followed by Mediterrean/Iranu-Turanean with 72 species. 

A novel geothermal heat pump (GHP) system with an integrated low- to moderate-temperature salt hydrate phase change material (PCM) storage tank for buildings in cold climates is proposed in this study. The purpose of the PCM storage tank is to dampen peak heating loads and to remove annual ground thermal load imbalances on the ground heat exchanger (GHX) to assist in achieving an optimally-sized GHX. As heat is extracted from the closed-loop system by heat pumps in heating mode, a significant portion of this heat is used to solidify a salt hydrate PCM. This heat of fusion is later released back into the heat transfer fluid, storing it in the PCM tank and GHX for later diurnal and seasonal use. To examine the merits of the proposed concept, electric utility meter data on 15-minute time intervals were mined from an actual apartment building and used to estimate space heating, cooling, and hot water heating loads. Those data were used in an hourly, dynamic 20-year life-cycle simulation model in TRNSYS to design an optimum combination of GHX and PCM storage, where each component was sized to balance the annual ground thermal loads. The system simulation results show significant potential for GHX size reduction with a PCM storage tank, but the system is quite sensitive to the PCM melt temperature due to significant hysteretic nature of the salt hydrate PCM heating and cooling curves. We also find that there is no unique optimum unless other factors are considered such as installation cost and physical constraints; many combinations of GHX size and PCM mass are capable of achieving the design goal with similar annual electric energy consumption. For the cases examined here, a PCM melt temperature of 27 °C yields the most favorable economic results, and a preliminary economic analysis suggests that with typical drilling cost and PCM tank cost values, the GHX size can be reduced by over 50 %.

Abstract

Background:Acne vulgaris is the most common skin condition affecting the pilosebaceoussystemin adolescents and young age and characterized bydifferentskinlesionsand might result in permanent scars. Chemical peeling is an effective option in the management of active acne. The mechanism of action lies in causing desquamation by targeting the corneosomes and keratinocytes, enhancing breakdown and decreasing cohesiveness. It also increases epidermal activity of enzymes, leading to epidermolysis and exfoliation and induces improvement of skin texture , pore size and reduces sebum production. Proper and successful treatment of acne involves choosing the right medication. Objectives:This study aims to evaluate the clinical efficacy and safety of using topical 25% Salicylic acid alone, in comparison with a combination of systemic Azithromycin and topical 25% salicylic acid, Zinc sulphate, and Benzoyl peroxide gel, in treatment of mild to moderate acne lesions. Subjects and methods:This study is a prospective, randomized clinical trial included a hundred patients diagnosed with mild-to-moderate facial acne vulgaris and randomly divided into two equal groups Group A, treated by25% Salicylic Acid peeling in combination with systemic Azithromycin in addition to Zinc sulphate and topical Benzoyl peroxide gel. Group B, treated by 25% salicylic peeling only.All patients received at least 6 peeling sessions performed 2 weeks apart in 12-weeks duration. Results:Number of peeling sessions was significantly lower in group A than group Bp= 0.03. Improvement rate (92%) 46 cases in group A vs. (20%) 10 cases in group B.Improvement score after 6th session was 4.71 in group A vs 2.67in group Bp<0.001.Also, there was a highly significant improvement after each session in group A as 15 cases (30%) needed only 4 sessions for complete improvement. group B showed only significant improvement after 2nd,3rd, and 4th sessions, while there was no improvement in score after 5th and 6thsessions.There were no statistically significant differences regarding risk factors of acne such as; psychological distress, family history, dairy product consumption, fast food, cosmetics, regular exercise and special diet habits p>0.05. Disease duration were matched in both groups as mean duration in group A was 26.8 versus 27.5 months in group B. Back & shoulder lesion were found in 34 cases in group A while they present in 31 cases in group B. There were no differences regarding lesions characteristics between both studied groups except for pustules that were predominant in group A in 34/50 cases (68%) whereas, they found in 24/50 cases (48%) in group Bp=0.04. Conclusion:Topical 25 % of salicylic acid is more efficient to treat mild to moderate acne vulgaris andincombinationwith systemic Azithromycin in addition to Zinc sulphate and topical Benzoyl peroxide gel is significant than alone and both protocols equal in safety and tolerability. Keywords:Acne Vulgaris, Salicylic Acid,Chemical Peeling, Benzoyl Peroxide.

The purpose of this paper is to minimize the total cost of raw material inventory for

water desalination and bottling plant resulting in a more profitable approach in

accordance with the production needs. The classical application of Economic Order

Quantity is used to support this paper and in order to reduce the costs related to

inventory. For this purpose, this method generates a minimum total inventory cost by

finding when ordering cost and carrying cost are equal. From this result, the inventory

level and the number of raw material demand become more economically suitable with

the production needs. It is because this method applies two types of cost, carrying cost

and ordering cost that make the total inventory cost more productive. So, this method

can be used to get the most economical total inventory cost and reduce storage cost

swelling. And hence, decreasing costs means that more profit is achieved.