1,720,973 research outputs found
Eliminazione dell’impedimento sterico con conseguente totale orientazione in orto della nitrazione aromatica ed effetto orientante long range in orto’ del gruppo nitro dell’o-nitrodifenilmetano con incremento di velocità
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A Simplified Application of Ordered Statistics Decoding to Single Parity Check Product Codes
Full text linkIn this paper we consider Ordered Statistics Decoding and we discuss some ideas aiming to reduce its complexity. As a case study, we focus on Single Parity Check Product Codes. First, we investigate how to simplify the construction of a reliable basis by exploiting the code structure. Then, we consider the iterative application of Soft-Input Soft-Output Ordered Statistics Decoding with small order to lower-dimensional subcodes. Results show that these simplified algorithms, both stand-alone and iterative, are still able to approach Maximum Likelihood Decoding of Single Parity Check Product Codes
Development and Optimization of an HPLC-PDA Method for the Determination of Major Cannabinoids in Hemp (Cannabis sativa L.) Essential Oil Obtained by Hydrodistillation
Full text linkThe use of hemp (Cannabis sativa L.) essential oil (EO) has shown a significant increase in interest and use during recent years. In this work, a new and simple reversed-phase HPLC with photodiode-array (PDA) detector method has been developed and optimized for the detection and quantification of cannabidiolic acid (CBDA), cannabidiol (CBD), cannabinol (CBN), Δ9-tetrahydrocannabinol (Δ9-THC), and Δ9-tetrahydrocannabinolic acid (THCA). The cannabinoids were extracted from the EO by partition with n-hexane and water, followed by sonication, evaporation to dryness under nitrogen, and reconstitution with methanol:chloroform (9:1, v/v) before HPLC-PDA analysis. The method shows good selectivity and robustness, linearity in the range 0.5–100 mg L−1 with R2 higher than 0.999 for all cannabinoids analyzed, LOD of 0.11–0.16 mg L−1, and LOQ of 0.35–0.48 mg L−1. The recovery was between 78 and 100% and the intra-day and intermediate precision, expressed as relative standard deviation (RSD), was < 4% and 4–10%, respectively
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