Abstract: Earth velocity changes under many reasons. They cause variations in the length of daytime. These reasons are; interior changes, which usually occur during events that tend to speed up Earth’s rotation slightly but noticeably, and Outward changes, where material that was typically at one point at a higher elevation on Earth surface falls down to be at a lower point. The first reason may show in several figures like earthquake and condensing core of earth. On the other hand, tide, melting glacier poles, and changing weather they cause the other reason. The amount of time that increasing or decreasing in a day until now do not exceed few seconds, but on the massive scale of time as the age of earth it becomes important value. 

An attempt has been made to evaluate the effect of welding parameters on the weld penetration, weld bead width and heat effective zone of Tungsten Inert Gas (TIG) welded 2 mm 304L stainless steel joints. The welding parameters including arc current, welding travel speed and gas flow rate were used to achieve the optimum joint. Taguchi technique has been implemented to optimize the welding parameters. Orthogonal array L9 (Three factors with three levels 3x3) was used to study the effect of arc current, welding travel speed and gas flow rate on the quality of 304 stainless steel welds. Signal to a noise ratio (SNR) and the analysis of variance (ANOVA) are also used to determine the main effects of different welding parameters on the weld bead width (WB), weld penetration (WP) and heat affected zone (HAZ). Results showed that welding current has significant effect, whereas gas flow rate showed no effect on the quality of 304Lwelded joints. Welding current of 185A, welding speed of 135mm/min and gas flow rate of 15lit/min have been selected as the best process parameter of weld bead width and weld penetration at level three of experiment seven. However, the optimum process parameter for heat affected zone are level one experimental three at165 A, 235 mm/min, 15 lit/min of welding arc current ,travel speed and gas feeding rate, respectively.

Abstract

Background: Warts are a common skin condition that affects people all over the world. This ailment affects 2–20% of students in primary school. A well-known keratolytic agent, potassium hydroxide (KOH), has many dermatological uses. Vitamin D is important in the proliferation and differentiation of keratinocytes.

Objective: The aim of the current work was to compare the efficacy and safety of intralesional vitamin D3 injections and 5% KOH cream separately and in combination with each other in the treatment of warts.

Patients and Methods: This study was carried out at the private outpatient Al- Ahlam Center of Dermatology and Cosmetology in Gharyan, Libya from 1^st of Sep to last of Dec 2021. 45 patients with warts were included in the study. They were classified into 3 groups according to method of treatment into Vitamin D3 group, 5% KOH cream group, and combination group.

Results: The mean age of patients was 27.04 ± 11.7 years. 31 patients completed the study. Complete response was seen in 12 patients with vitamin D injection after period of 4 months, 9 patients with 5% KOH cream after period 2-3 months, and 10 patients with combination both treatment after a period of 1 month.

Conclusions: It could be concluded that intralesional vitamin D with 5% KOH cream is safe, effective, and inexpensive treatment option for recalcitrant palmoplantar and periungual warts.

 KeywordsVitamin D3; Palmoplanter; Periungual; KOH; Warts

Abstract

The present work was carried out in order to investigate the physical and chemical quality of the Libyan Asbi'ah groundwater and the degree of its contamination. The achieved results were compared with international quality standards for drinking water. The sampleswere collected from five water wells of the Asbi'ah region. Several parameters were examined including Colour, Taste, smell, pH, total dissolved solids (TDS), Calcium and Magnesium Hardness, Total Hardness, Iron, Fluoride, Ammonia, Phosphate and Chloride. The results showed that the groundwater of Asbi'ah area were within the limitations of WHO Standards. For instance, the maximum values of Fe, PO4, F, NH3 and Cl were (0.92, 0.16, 1.2, 0.05)mg/L respectively. However, some samples had a bit high of concentrations for TDS (590mg/L) and Total Hardness (702mg/L). The most of the water wells shared the high concentration of Total Hardness which might be due to the earth geology of the studied area. This makes the water taste unacceptable and therefore, the water might not be used as drinking water.

Keywords: Natural Groundwater, Chemical & Physical Properties, Contamination, Asbi'ah -Libya.