Digitized Engineering Notebook

The GSURobotics.org is a Digitized Engineering web based application which will allow the students to upload projects details thru the website. Each team needs to create their account and can be able to create or edit their project details such as texts, images or even the team videos. It’s an annual robotics competition where in each team will be reviewed by a team of pioneers and awards will be facilitated to the team that shows creativity and innovation. The competition is completely online. Goals • Challenge students to apply skills in creative ways. • Encourage participation by the public and private firms. • Integrate technology and creativity skills. It’s a new application which can provide the following: • Competitions are open to all school clubs. • Each team can submit as many projects as they want. • There is no time limit for the projects. • Projects will be ranked for their creativity, structure, and their functions. • As per the project deadline the application will be released on April 17 2017. Methods or Algorithms: GSURobotics.com is a rock-solid web application and easy to navigate, dynamic web application with multiple features. We have planned to implement this project by using ASP.net technology for the front end and to store the data in the backend we will be using SQL server. The front page will guide for the team registration. Once the registration is done then the student can upload their project with the project documents, videos and images

Comparative Study of Advanced Oxidation Processes to Treat Petroleum Wastewater

This study was carried out to compare the performance of different oxidation processes, such as solar photo-Fenton reaction, solar photocatalysis by TiO2, and the combination of the two for the treatment of petroleum wastewater from Sohar Oil Refinery by a central composite design with response surface methodology. The degradation efficiency was evaluated in terms of chemical oxygen demand (COD) and total organic carbon (TOC) reductions. Solar photocatalysis by the TiO2/Fenton method improved the performance of the photocatalyst at neutral pH for petroleum wastewater without the need to adjust the pH during this treatment. Under acidic conditions, the solar photo-Fenton process is more efficient than solar TiO2 photocatalysis while it is less efficient under alkaline conditions. The TiO2 dosage and pH are the two main factors that improved the TOC and COD reductions in the solar photocatalysis using combined TiO2/Fenton and the solar TiO2 photocatalysis processes while the pH and H2O2 concentration are the two key factors that affect the solar photo-Fenton process

Impact of subdominant modes on the interpretation of gravitational-wave signals from heavy binary black hole systems

Over the past year, a handful of new gravitational wave models have been developed to include multiple harmonic modes thereby enabling for the first time fully Bayesian inference studies including higher modes to be performed. Using one recently developed numerical relativity surrogate model, NRHybSur3dq8, we investigate the importance of higher modes on parameter inference of coalescing massive binary black holes. We focus on examples relevant to the current three-detector network of observatories, with a detector-frame mass set to 120 M⊙ and with signal amplitude values that are consistent with plausible candidates for the next few observing runs. We show that for such systems the higher mode content will be important for interpreting coalescing binary black holes, reducing systematic bias, and computing properties of the remnant object. Even for comparable-mass binaries and at low signal amplitude, the omission of higher modes can influence posterior probability distributions. We discuss the impact of our results on source population inference and self-consistency tests of general relativity. Our work can be used to better understand asymmetric binary black hole merger events, such as GW190412. Higher modes are critical for such systems, and their omission usually produces substantial parameter biases

Analysis of GWTC-3 with fully precessing numerical relativity surrogate models

The third Gravitational-Wave Transient Catalog (GWTC-3) contains 90 binary coalescence candidates detected by the LIGO-Virgo-KAGRA Collaboration (LVK). We provide a re-analysis of binary black hole (BBH) events using a recently developed numerical relativity (NR) waveform surrogate model, NRSur7dq4, that includes all $\ell \leq 4$ spin-weighted spherical harmonic modes as well as the complete physical effects of precession. Properties of the remnant black holes' (BH's) mass, spin vector, and kick vector are found using an associated remnant surrogate model NRSur7dq4Remnant. Both NRSur7dq4 and NRSur7dq4Remnant models have errors comparable to numerical relativity simulations and allow for high-accuracy parameter estimates. We restrict our analysis to 47 BBH events that fall within the regime of validity of NRSur7dq4 (mass ratios greater than 1/6 and total masses greater than $60 M_{\odot}$). While for most of these events our results match the LVK analyses that were obtained using the semi-analytical models such as IMRPhenomXPHM and SEOBNRv4PHM, we find that for more than 20\% of events the NRSur7dq4 model recovers noticeably different measurements of black hole properties like the masses and spins, as well as extrinsic properties like the binary inclination and distance. For instance, GW150914_095045 exhibits noticeable differences in spin precession and spin magnitude measurements. Other notable findings include one event (GW191109_010717) that constrains the effective spin $\chi_{eff}$ to be negative at a 99.3\% credible level and two events (GW191109_010717 and GW200129_065458) with well-constrained kick velocities. Furthermore, compared to the models used in the LVK analyses, NRSur7dq4 recovers a larger signal-to-noise ratio and/or Bayes factors for several events.Comment: Posteriors and animations are made publicly available at https://nrsur-catalog.github.io/NRSurCat-

SARS-CoV-2 Infection Is at Herd Immunity in the Majority Segment of the Population of Qatar.

BACKGROUND: Qatar experienced a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) epidemic that disproportionately affected the craft and manual worker (CMW) population, who comprise 60% of the total population. This study aimed to assess ever and/or current infection prevalence in this population. METHODS: A cross-sectional population-based survey was conducted during July 26 to September 09, 2020, to assess both anti-SARS-CoV-2 positivity through serological testing and current infection positivity through polymerase chain reaction (PCR) testing. Associations with antibody and PCR positivity were identified through regression analyses. RESULTS: The study included 2641 participants, 69.3% of whom were <40 years of age. Anti-SARS-CoV-2 positivity was 55.3% (95% CI, 53.3%-57.3%) and was significantly associated with nationality, geographic location, educational attainment, occupation, and previous infection diagnosis. PCR positivity was 11.3% (95% CI, 9.9%-12.8%) and was significantly associated with nationality, geographic location, occupation, contact with an infected person, and reporting 2 or more symptoms. Infection positivity (antibody and/or PCR positive) was 60.6% (95% CI, 58.6%-62.5%). The proportion of antibody-positive CMWs who had a prior SARS-CoV-2 diagnosis was 9.3% (95% CI, 7.9%-11.0%). Only seven infections were ever severe, and only 1 was ever critical-an infection severity rate of 0.5% (95% CI, 0.2%-1.0%). CONCLUSIONS: Six in every 10 CMWs in Qatar have been infected, suggestive of reaching the herd immunity threshold. Infection severity was low, with only 1 in every 200 infections progressing to be severe or critical. Only 1 in every 10 infections had been previously diagnosed, which is suggestive of mostly asymptomatic or mild infections

Effects of inertia on Newtonian fluid in squeezed film by recursive approach

The thesis accomplishes the theoretical study of the effect of inertia on Newtonian fluid in squeezed. This research undertaking to get in ingenious knowledge for the procedure of the axisymmetric viscous fluid flow in between parallel plates steadily approaching to each other, as well the inertia effect is under consideration.  Thereby, the crucial part of this thesis is to theoretically investigate rather than experimentally. Be sure that as it may, the expectation from this study is that it could be experimentally performed, so will get practical benefits, in the form of the improvement in the process of flow of oil in bearing and governs with capacity of load – bearing and improving the results of oil in bearing. The primary focused object of this work is to develop a mathematical model, thereby, to calculate the velocity profile likewise radial and axial velocity and pressure. In this research work, the squeezed film of Newtonian fluid between two disks is taken to obtain an analytical solution (PDE – Partial Differential Equations) subject to the favorable boundary conditions, as well as the inertia effect is under consideration. In this thesis the recursive approach is utilized to get an analytical solution and the obtained solution is examined with perturbation method. The examined solution has been found as the main objective of this study. It is analyzed that the recursive approach is easy to use and appears more effective. Keywords: Newtonian fluid, Non-Newtonian fluids. Ideal fluids Squeezed fluid, Inertia effect, Velocity Profile, Pressure. DOI: 10.7176/MTM/12-1-04 Publication date: February 28th 202

Thermal efficiency enhancement of mono and hybrid nanofluids in solar thermal applications – A review

Everywhere throughout the world, primarily in all industrial sectors, there is a tremendous need for energy. The only option to meet the energy demand is via fossil fuels. Global warming and environmental pollution are caused by the usage of fossil fuels and the fast expansion of industry. In addition, relying on renewable energy sources is vital due to the finite availability of fossil fuels. The most promising renewable energy source in the world is solar energy, which is generally accessible on the surface of the globe. In the solar flat plate collector, solar energy can be transformed into thermal energy. The working fluid employed in the collector is the only factor that influences its thermal efficiency.The majority of research found that increasing the collector's thermal efficiency can be accomplished by substituting high thermal conductivity fluids called nanofluids and hybrid nanofluids for the working fluid. A few decades ago, studies involving nanofluids in solar collectors were carried out. In order to significantly increase the efficiency of solar collectors employing hybrid nanofluids, researchers are currently working on these devices. By replacing one fluid in solar thermal systems with high thermal conductivity fluid, larger effectiveness has been achieved. Nanofluids offer larger thermal conductivity values over their base fluid. By using these nanofluids in solar thermal systems can provide the augmented heat transfer coefficient, effectiveness and thermal performance.Hybrid nanofluids are high thermal conductivity fluids compared to mono-dispersed nanofluids. Usage of hybrid nanofluids enhances the fluid thermal properties in solar thermal systems including the thermal conductivity, density, viscosity and specific heat. The synthesis of hybrid nanoparticles, hybrid nanofluids, characterization, thermophysical characteristics, stability analysis and application of mono and hybrid nanofluids in solar thermal systemsspecifically to flat plate collectoris critically reviewed and presented in this paper