The next-generation Airborne Collision Avoidance System (ACAS X) is currently being developed and tested to replace the Traffic Alert and Collision Avoidance System (TCAS) as the next international standard for collision avoidance. To validate the safety of the system, stress testing in simulation is one of several approaches for analyzing nearmid-air collisions (NMACs). Understanding how NMACs...

subh al-'a'sh? f? san?'at al-insh?' is one of the greatest encyclopedias produced in the islamic civilization before the ninth century after hegira. the book addresses a plethora of historical, scientific and literary issues in which the writer explains the administration mechanism of d?w?n al-insh?' (a secretariat keeping the records of non-financial and non-military c...

BACKGROUND Drug use (illicit drug use and nonmedical use of prescription drugs) is common but underrecognized in primary care settings. We validated a single-question screening test for drug use and drug use disorders in primary care. METHODS Adult patients recruited from primary care waiting rooms were asked the single screening question, "How many times in the past year have you used an ill...

The Drug Abuse Screening Test-20 was translated and established validation properties to make it a sound assessment tool. A cross-sectional study with descriptive design planned which involved survey methods conducted at Riphah International University, Faisalabad. Four experts from the psychology field literature were approached for forward backward translation process. responses on original v...

Novel N-methoxymethylated (MOM) pyrimidine (4-13) and pyrimidine-2,4-diones (15-17) nucleoside mimetics in which an isobutyl side-chain is attached at the C-6 position of the pyrimidine moiety were synthesized. Synthetic methods via O-persilylated or N-anionic uracil derivatives have been evaluated for the synthesis of N-1- and/or N-3-MOM pyrimidine derivatives with C-6 acyclic side-chains. A s...

We report on efficient THz generation in DAST by optical rectification of intense mid-IR pulses centered at (i) 3.9 μm and (ii) its second harmonic 1.95 μm. Suppression multi-photon absorption shifts the onset saturation conversion efficiency to pump energy densities, which are almost an order magnitude higher as compared conventional schemes 1.5 Despite strong linear μm, exhibits a high optica...

We report on optical channel waveguiding in an organic crystalline waveguide produced by direct electron beam patterning. The refractive index profile as a function of the applied electron fluence has been determined by a reflection scan method in the nonlinear optical organic crystal 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST). A maximal refractive index reduction of Deltan1...

Abstract The experimental and numerical study both generation transmission terahertz pulse in a nonlinear crystal partially filling the rectangular metallic waveguide cross-section is presented. LiNbO 3 DAST crystals have been studied since they high-quality factor (FOM) optical rectification them most promising method for generating an extremely strong field. Experimentally numerically has sho...