Open AccessEngineering NotesRelative Orbit Determination for Unconnected Spacecraft Within a ConstellationTong Qin, Dong Qiao and Malcolm MacdonaldTong QinTsinghua University, 100084 Beijing, People’s Republic of China*Postdoctoral Researcher, Department Precision Instrument; .Search more papers by this author, QiaoBeijing Institute Technology, 100081 China†Professor, School Aerospace Engineeri...

Background: Localized and extensive clinical subtypes of alopecia areata (AA) including alopecia totalis and alopecia universalis differ in genetic and immunologic aspects. Objective: Comparison of epidemiologic aspects of localized and extensive subtypes of AA. Patients and Methods: In a prospective descriptive study, 180 patients suffering from AA attending the skin clinics of Razi Hosp...

Ascorbic acid (AA) has been reported as a treatment for cancer patients. Intravenous (iv) administration of high-dose AA increases plasma AA levels to pharmacologic concentrations and generates reactive oxygen species (ROS) to exert anti-tumor activity via enhancement of oxidative stress. However, AA is very unstable in aqueous solutions and it is impossible to preserve AA for a long period in ...

Friction Stir Welding (FSW) is an efficient and effective welding method with good-quality welds. Aluminum Alloy (AA) has been widely used for various automotive needs, including in vehicle manufacturing. AA series 5XXX a type of material manufacturing because it good strength properties even after the joining process. A similar butt joint using FSW was carried out on 5052 5083. The results wer...

Intravenous administration of high-dose ascorbic acid (AA) has been reported as a treatment for cancer patients. However, cancer patients with renal failure cannot receive this therapy because high-dose AA infusion can have side effects. To solve this problem, we evaluated the antitumor activity of a lipophilic stable AA derivative, 2-O-α-d-glucopyranosyl-6-O-(2-pentylheptanoyl)-l-ascorbic acid...