Miracle-dz/UniFAR-FTUs huggingface dataset:
Mathematical models and decomposition methods for the two-bar charts packing problem

We consider the two-bar charts packing (2-BCPP), a recent combinatorial optimization problem whose aim is to pack a set of one-dimensional items into the minimum number of bins. As opposed to the well-known bin packing problem, pairs of items are grouped to form bar charts, and a solution is only feasible if the first and second items of every bar chart are packed in consecutive bins. After providing a complete picture of the connections between the 2-BCPP and other relevant packing problems, we show how we can use these connections to derive valid lower and upper bounds for the problem. We then introduce two new integer linear programming (ILP) models to solve the 2-BCPP based on a non-trivial extension of the arcflow formulation. Even though both models involve an exponential number of constraints, we show that they can be solved within a constraint generation framework. We then empirically evaluate the performance of our bounds and exact approaches against an ILP model from the literature and demonstrate the effectiveness of our techniques, both on benchmarks inspired by the literature and on new classes of instances that are specifically designed to be hard to solve. The outcomes of our experiments are important for the packing community because they indicate that arcflow formulations can be used to solve targeted packing problems with precedence constraints and also that some of these formulations can be solved with constraint generation.
Kaluza-Klein relics from warped reheating

It has been suggested that after brane-antibrane inflation in a Klebanov-Strassler (KS) warped throat, metastable Kaluza-Klein (KK) excitations can be formed due to nearly-conserved angular momenta along isometric directions in the throat. If sufficiently long-lived, these relics could conflict with bigbang nucleosynthesis or baryogenesis by dominating the energy density of the universe. We make a detailed estimate of the decay rate of such relics using the low energy effective action of type IIB string theory compactified on the throat geometry, with attention to powers of the warp factor. We find that it is necessary to turn on SUSY-breaking deformations of the KS background in order to ensure that the most dangerous relics will decay fast enough. The decay rate is found to be much larger than the naive guess based on the dimension of the operators which break the angular isometries of the throat. For an inflationary warp factor of orderw ∼ 10 −4 , we obtain the boundM3/2 > ∼ 10 9 GeV on the scale of SUSY breaking to avoid cosmological problems from the relics, which is satisfied in the KKLT construction assumed to stabilize the compactification. Given the requirement that the relics decay before nucleosynthesis or baryogenesis, we place bounds on the mass of the relic as a function of the warp factor in the throat for more general warped backgrounds.
Extraction yield of humic substances from organic materials • sustancias a partir de materiales orgánicos

At present there is a great advance in the use of organic substances as fertilizers; humic substances are one of them with various forms of extraction. This article evaluates the extraction yield of humic substances (humic acid and fulvic acid) from three raw materials and different basic extractants and acids. In the basic extraction of humic substances, the type of raw material significantly influences, to a p value equal to 5 %. The maximum extraction volumes of humic substances are with garden waste. The fractionation stage of the humic and fulvic acids (acid extraction) depends on the type of basic extractant. The alternative Vermicompost - NaOH - HCl is the most economic and technically feasible, with 38.53 % of extraction yield value of humic acid and 64.90 $/h of gross profit.
Non-linear stochastic growth rates and redshift space distortions

The linear growth rate is commonly defined through a simple deterministic relation between the velocity divergence and the matter overdensity in the linear regime. We introduce a formalism that extends this to a non-linear, stochastic relation between θ = ∇ ∙ v(x,t)/aH and δ. This provides a new phenomenological approach that examines the conditional mean , together with the fluctuations of θ around this mean. We also measure these stochastic components using N-body simulations and find they are non-negative and increase with decreasing scale from ~10 per cent at k away from the linear theory prediction -fLTδ, where fLT is the linear growth rate. This rotation increases with wavenumber, k, and we show that it can be well-described by second-order Lagrangian perturbation theory (2LPT) fork < 0.1 h Mpc-1. Furthermore, the stochasticity in the θ – δ relation is not somore » simply described by 2LPT, and we discuss its impact on measurements of fLT from two-point statistics in redshift space. Furthermore, given that the relationship between δ and θ is stochastic and non-linear, this will have implications for the interpretation and precision of fLT extracted using models which assume a linear, deterministic expression. « less
UsTube-A Grounded Theory Analysis of the Relationship Between YouTube and Influencers

UsTube — An Exploration of the Relationship Between YouTube and Influencers Alex Michie Sanders School of Communications, BYU Master of Arts Since YouTube’s launch in 2005, it has grown into one of the most visited social media platforms in the world. It launched with the slogan “Broadcast Yourself” with the promise that the content sharing site would allow anyone to post, share, and interact with videos from anyone around the world for free. Many people took advantage of that promise and became Internet celebrities, or “influencers,” in a short amount of time, amassing millions of subscribers and billions of views. The success of these YouTube stars has led them to land roles on TV and in films, launch music careers, write books, and many other avenues. However, these stars have also had their fair share of public controversies that have caused advertisers to pull their content from YouTube’s platform. This has forced YouTube to change their algorithm and other procedures so that YouTube stars’ videos are no longer boosted to the front page, which in turn hurts their budding careers. This puts YouTube at a crossroads between billions of dollars in advertising revenue and the homegrown celebrities that helped make YouTube what it is today. The research in this study examined what YouTube influencers value and would change about YouTube’s affordances to help make the website a better opportunity for anyone and everyone to grow their Internet careers. Using qualitative methods to gain insights from several YouTube influencers, this study explored what YouTube and other future social media accounts can do to help those that know and utilize their platforms best. The findings of this study show that while social media oftentimes acts as a conduit for online content sharing, YouTube doubles as an investor who will back videos with advertising revenue, front-page access, and algorithmic preference to boost a video’s success and reach. This venture capital-style system comes with challenges as influencers can both benefit greatly from these affordances, but also be hurt when these affordances block their videos from finding audiences. Because of this, money-making on YouTube can be highly rewarding, but also discouraging and risky. Influencers are often stuck finding other ways to make money such as external sponsorship, platform diversification, and independent merchandising. This puts YouTube and influencers in a constant state of renegotiation where YouTube toes the line of pleasing advertisers and influencers while influencers struggle to work around YouTube affordances, policies, and terms. These findings show that YouTube is a rich, immersive medium with significant potential for influencers. The findings also show that affordances, while often viewed as beneficial to all parties, may at times be beneficial and detrimental depending on the individual. Future research can build off the foundation this study lays to learn if this model exists on other platforms and media.
A STUDY ON ELECTROMAGNETIC TOPOLOGY OPTIMIZATION USING BINARY PARTICLE SWARM ALGORITHM

Topology optimization is a state-of-the-art tool for detecting the best material layout in a physical space to obtain certain goals. Initially developed as a structural engineering tool, it has been recently used in electromagnetics and has shown immense potential. The aim of this work is to build a framework for applying the topology optimization method in electromagnetics using a modified binary particle swarm optimization (BPSO) algorithm. In this thesis, a very classic problem of coax to waveguide transition has been considered, and a novel solution has been given using topology optimization. The steps to implementing topology optimization using BPSO have been thoroughly documented. The optimized transition has been fabricated and tested to give excellent results. Traditional transitions are used in the performance analysis of the optimized structure. The results obtained have been very promising and this technique can be utilized in creating elegant solutions to complex electromagnetic problems.
DISTANCE AND KINEMATICS OF THE TW HYDRAE ASSOCIATION FROM PARALLAXES

From common proper motion and signatures of youth, researchers have identified about 30 members of a putative TW Hydrae Association. Only four of these had parallactic distances from Hipparcos. We have measured parallaxes and proper motions for 14 primary members. We combine these with literature values of radial velocities to show that the Galactic space motions of the stars, with the exception of TWA 9 and 22, are parallel and do not indicate convergence at a common formation point sometime in the last few million years. The space motions of TWA 9 and 22 do not agree with the others and indicate that they are not TWA members. The median parallax is 18 mas or 56 pc. We further analyze the stars' absolute magnitudes on pre-main-sequence evolutionary tracks and find a range of ages with a median of 10.1 Myr and no correlation between age and Galactic location. The TWA stars may have formed from an extended and filamentary molecular cloud but are not necessarily precisely coeval.
Giambelli identity in super Chern-Simons matrix model

A classical identity due to Giambelli in representation theory states that the character in any representation is expressed as a determinant whose components are characters in the hook representation constructed from all the combinations of the arm and leg lengths of the original representation. We prove that, in a general fractional-brane background, the identity persists in taking, for each character, the matrix integration of the super Chern-Simons matrix model in the grand canonical ensemble.
Updated geographical distribution of the Sunbittern ( helias

The Sunbittern ( Eurypyga helias ), despite having a wide distribution, is poorly studied and with few records in its area of distribution. Updating the distributions of species allows us to understand distributional patterns which are useful in ecology and conservation, especially for rare or threatened species. Given this situation for E. helias and the new records outside its historical range, here we present its updated distribution and a new record in the south of the Middle Magdalena Valley in Colombia. Using occurrences with preserved specimens and photographic records we build an Ecological Niche Model using the algorithm implemented in MaxEnt. The new record was found in the municipality of La Belleza, Santander in northern Colombia. Its range extends approximately 200 km south of its historical distribution. In Venezuela, it could reach the northern part near the foothills of the Cordilleras Central and Oriental. In Bolivia to the south over the Chiquitano Forest. In Central America, it extends to the lowlands near the Cordillera Central and the Cordillera Volcánica Central, and in North America to southern Mexico. The model suggests that tropical lowlands are more suitable for the species than cold temperate zones, also, the Middle Magdalena Valley is a suitable area, however, the species prefers forested and preserved areas. Some distribution patterns could be explained by different biogeograph ical barriers, but phylogeographical analyzes are needed to test this hypothesis.
Truncation, Randomization, and Selection GENERATION OF A REDUCED LENGTH c-Jun ANTAGONIST THAT RETAINS HIGH INTERACTION STABILITY *

The DNA binding activity of the transcriptional regulator activator protein-1 shows considerable promise as a target in cancer therapy. A number of different strategies have been employed to inhibit the function of this protein with promise having been demonstrated both in vitro and in vivo . Peptide-basedtherapeuticshavereceivedrenewedinterestinthelastfew years, and a number of 37-amino acid peptides capable of binding to the coiled coil dimerization domain of Jun and Fos have been derived. Here, we demonstrate how truncation and semirational library design, followed by protein-fragment complementation, can be used to produce a leucine zipper binding peptide by iterative means. To this end, we have implemented this strategy on the FosW peptide to produce 4hFosW. This peptide is truncated by four residues with comparably favorable binding properties and demonstrates the possibility to design progres-sively shorter peptides to serve as leucine zipper antagonists while retaining many of the key features of the parent peptide. However, 1:2 ( 3rd lane ) or 1:7 molar ratio ( 4th lane ), the intensity of the free stained DNA in A is seen to increase. Moreover, at the increased molar ratio of 1:7, the intensity of the protein stained DNA (cid:1) protein complex is significantly lower, demonstrating that 4hFosW has an inhibitory effect on the DNA binding ability of AP-1.
O vi IN THE LOCAL INTERSTELLAR MEDIUM

We report the results of a search for O vi absorption in the spectra of 80 hot DA white dwarfs observed by the FUSE satellite. We have carried out a detailed analysis of the radial velocities of interstellar and (where present) stellar absorption lines for the entire sample of stars. In approximately 35% of cases (where photospheric material is detected), the velocity differences between the interstellar and photospheric components were beneath the resolution of the FUSE spectrographs. Therefore, in 65% of these stars the interstellar and photospheric contributions could be separated and the nature of the O vi component unambiguously determined. Furthermore, in other examples, where the spectra were of a high signal-to-noise, no photospheric material was found and any O vi detected was assumed to be interstellar. Building on the earlier work of Oegerle et al. and Savage & Lehner, we have increased the number of detections of interstellar O vi and, for the first time, compared their locations with both the soft X-ray background emission and new detailed maps of the distribution of neutral gas within the local interstellar medium. We find no strong evidence to support a spatial correlation between O vi and SXRB emission. In all but a few cases, the interstellar O vi was located at or beyond the boundaries of the local cavity. Hence, any T ∼ 300,000 K gas responsible for the O vi absorption may reside at the interface between the cavity and surrounding medium or in that medium itself. Consequently, it appears that there is much less O vi-bearing gas than previously stated within the inner rarefied regions of the local interstellar cavity.
IMPACTS OF GRID ELECTRICITY ACCESS ON RURAL NON-FARM ENTREPRENEURSHIP AND EMPLOYMENT IN ETHIOPIA AND NIGERIA

Rural electricity supply is broadly considered a key driver of the structural transformation away from a dependence on agricultural livelihoods. Nevertheless, the causal effect of improving electricity access on the diversification of rural livelihoods away from agricultural incomes remains poorly understood. Recent systematic syntheses of electrification impacts in literature confirm that there remains limited quasi-experimental quantitative evidence describing the effects of electrification on non-farm entrepreneurship and labor market outcomes in Sub-Saharan African countries. In this report, we investigate the causal effects of household-level electrification on household non-farm entrepreneurship and employment trends in rural Ethiopia and Nigeria, contributing to the literature in terms of the geographical region of analysis and through the application of modern quasi-experimental methods. We analyze household-level observational panel datasets collected under the World Bank’s Living Standards Measurement Survey (LSMS) program, between 2010 and 2015. Our analysis indicates that rural household electrification alone was insufficient to trigger shifts in household non-farm entrepreneurship and labour market outcomes in the 2-4 years following grid connection. These findings are aligned with contemporary rural electrification impact literature urging caution in the interpretation of descriptive and potentially biased analyses that are unable to effectively disentangle the many co-determinants of non-farm entrepreneurship and labour market outcomes with respect to electrification.
Inflection point inflation: WMAP constraints and a solution to the fine tuning problem

We consider observational constraints and fine-tuning issues in a renormalizable model of inflection point inflation, with two independent parameters. We derive constraints on the parameter space of this model arising from the WMAP 7-year power spectrum. It has previously been shown that it is possible to successfully embed this potential in the MSSM. Unfortunately, to do this requires severe fine-tuning. We address this issue by introducing a hybrid field to dynamically uplift the potential with a subsequent smooth phase transition to end inflation at the necessary point. Large parameter regions exist where this drastically reduces the fine-tuning required without ruining the viability of the model. A side effect of this mechanism is that it increases the width of the slow-roll region of the potential, thus also alleviating the problem of the fine-tuning of initial conditions. The MSSM embedding we study has been previously shown to be able to explain the smallness of the neutrino masses. The hybrid transition does not spoil this feature as there exist parameter regions where the fine-tuning parameter is as large as 10−1 and the neutrino masses remain small.
Colored Khovanov–Rozansky homology for
infinite braids

We show that the limiting unicolored $\mathfrak{sl}(N)$ Khovanov-Rozansky chain complex of any infinite positive braid categorifies a highest-weight projector. This result extends an earlier result of Cautis categorifying highest-weight projectors using the limiting complex of infinite torus braids. Additionally, we show that the results hold in the case of colored HOMFLY-PT Khovanov-Rozansky homology as well. An application of this result is given in finding a partial isomorphism between the HOMFLY-PT homology of any braid positive link and the stable HOMFLY-PT homology of the infinite torus knot as computed by Hogancamp.
Enhanced Performance of On-board EV Battery Charger with Universal Power Supply

Abstract This paper is intended to provide enhanced features of onboard EV battery chargers in terms of improved power quality feature, reduced voltage stress, reduced filter size, high efficiency and fast dynamic response for universal input voltage range (85–265 V). The proposed configuration comprises of three-level quadratic converter suitable to provide high voltage gain. The detailed operation, analysis and control scheme of the proposed converter rated for 3.2 kW, 400 V are studied under simulation and hardware in a loop environment. The on-board charger performances are assessed by charging a 40 Ah lithium ion EV battery under different charging modes. The state of charge of battery decides converter operating mode i.e. constant current and constant voltage mode to charge the battery. Enhancement in the onboard charger is observed in both operating modes tested for wide variation in supply voltages. The results reveal that the operation of converter depicts unity power factor operation, improvement in supply current harmonics and controlling output voltage/current. Under both operating modes, the proposed charger draws sinusoidal supply current from ac mains and its THD is reduced to specified limit prescribed by IEC-61000-3-2. Furthermore, the charger performance is also investigated for EV battery charging operation at wide input voltage variations and found satisfactory.
Temporally multiplexed superposition states of continuous variables

We study non-Gaussian states generated by two-photon subtraction from a continuous-wave (cw) squeezed light source. In a cw scheme, one can subtract two photons from the source with a designated time separation and can generate temporally multiplexed superposition states of continuous variables. We numerically study the properties of these states in light of bosonic interference in the time domain. In an appropriate temporal mode, an amplified superposition state of continuous variable is produced in a region where the time separation is comparable with the coherence time of squeezed packets.
Oxygen isotopic ratios in intermediate-mass red giants

Context. The abundances of the three main isotopes of oxygen are altered in the course of the CNO-cycle. When the first dredge-up mixes the burning products to the surface, the nucleosynthesis processes can be probed by measuring oxygen isotopic ratios. Aims. By measuring 16O/17O and 16O/18O in red giants of known mass we compare the isotope ratios with predictions from stellar and galactic evolution modelling. Methods. Oxygen isotopic ratios were derived from the K-band spectra of six red giants. The sample red giants are open cluster members with known masses of between 1.8 and 4.5 Msun . The abundance determination employs synthetic spectra calculated with the COMARCS code. The effect of uncertainties in the nuclear reaction rates, the mixing length, and of a change in the initial abundance of the oxygen isotopes was determined by a set of nucleosynthesis and mixing models using the FUNS code. Results. The observed 16O/17O ratios are in good agreement with the model results, even if the measured values do not present clear evidence of a variation with the stellar mass. The observed 16O/18O ratios are clearly lower than the predictions from our reference model. Variations in nuclear reaction rates and mixing length parameter both have only a very weak effect on the predicted values. The 12C/13C ratios of the K giants studied implies the absence of extra-mixing in these objects. Conclusions. A comparison with galactic chemical evolution models indicates that the 16O/18O abundance ratio underwent a faster decrease than predicted. To explain the observed ratios, the most likely scenario is a higher initial 18O abundance combined with a lower initial 16 O abundance. Comparing the measured 18 O/17 O ratio with the corresponding value for the ISM points towards an initial enhancement of 17O as well. Limitations imposed by the observations prevent this from being a conclusive result.