We consider the following problem of scheduling with conflicts (SWC): Find a minimum makespan schedule on identical machines where conflicting jobs cannot be scheduled concurrently. We study the problem when conflicts between jobs are modeled by general graphs. Our first main positive result is an exact algorithm for two machines and job sizes in {1, 2}. For jobs sizes in {1, 2, 3}, we can obta...

The Chemical Release Observation (CRO) program developed three small satellites that were deployed from the Shuttle on flight STS-39. These were small experimental satellites built with a minimum of paperwork. while meeting all the necessary NASAISTS requirements. Each satellite contained a chemical (either hydrazine or an oxidizer) which was released on ground command. The satellites were appr...

Two Multi-Layer Perceptron (MLP) models are developed to estimate the radar reflectivity factor (dBZ) and rain intensity (R) from the spectral moments of an L-band wind profiler. Out of the four spectral moment inputs of the MLP models, the backscattered power (P) and Doppler velocity (VD) were found to have better correlation with the rain parameters. The model results were validated with the ...

The papaya plant Carica papaya (family: Caricaceae), locally known as Papita, is cultivated commonly in different parts of Sindh-Pakistan specially in Karachi. It was reported hermaphrodite. Recently it has been reported to be an important plant, due to having X and Y chromosomes. As it has been already reported that the papaya sex chromosomes have virtually all of the features that the human s...

Alterations of species phenology in response to climate change are now unquestionable. Until now, most studies have reported precocious occurrence of life cycle events as a major phenological response. Desynchronizations of biotic interactions, in particular predator-prey relationships, are however assumed to strongly impact ecosystems' functioning, as formalized by the Match-Mismatch Hypothesi...

The current systematic review aimed to summarize prevalence rates of work-related musculoskeletal disorders (WRMSDs) and quantify the associations between physical or psychosocial risk factors WRMSDs in construction workers. Literature searches were conducted Web Science, PubMed, Medline, CINAHL, EMBASE from January 1, 2000 September 30, 2020. methodological quality included studies was assesse...

The spray atomization of an injector significantly influences the performance and working life span a bipropellant thruster spacecraft. Deep space exploration requires to be able operate reliably at low temperature range from −40 °C 0 °C, so effect conditions on characteristics is motivated comprehensively investigated. To study swirl MMH (methylhydrazine), which more difficult atomize than NTO...

Numerous researchers have found that heavy physical demand and improper posture when performing the tasks in various sectors such as manufacturing warehouse might contribute to musculoskeletal disorders (MSDs) especially involving lifting, pushing pulling activities. In order reduce high risk manual handling activities, effectives usable equipment (MHE) should be introduce lower of material (MM...

2-Dimethyl amino ethyl azide (DMAZ) has attracted much attention as a suitable liquid fuel replacement for monomethyl hydrazine (MMH) and unsymmetrical dimethyl hydrazine (UDMH) in propellant systems because, in contrast to these fuels, it is noncarcinogen. In this research, performance, and ignition delay time of DMAZ were studied with common liquid oxidizers such as inhibited red fuming n...