Linked Into a Job?: the Ethical Considerations of Recruiting Through LinkedIn

LinkedIn’s goal is to help business professionals meet, make business deals, inquire about jobs, and find careers through connections with people that members already know. This research study will investigate the ethical practices of LinkedIn recruitment. Students’ awareness of the methods for effective use, as well as the damaging elements of a LinkedIn profile will be examined. LinkedIn is an effective, helpful tool for recruiting candidates and for job searching; however, the best results will come to those who use LinkedIn professionally and with caution. Our findings indicate that despite its risks, jobseekers and employers can benefit from using LinkedIn

Lactic acid bacteria from fermented whey as a biocontrol tool against phytopathogenic microorganisms

Biological control is a bioeffector-method that uses organisms to control populations of other organisms. This method is widely used to prevent pests, diseases and weeds proving to be a viable alternative to avoid using antibiotics and pesticides in animal feed and crops. Lactic acid bacteria (LAB) have been identified as potencial microorganisms in the field of biocontrol. The aim of this work is identifing LAB present in whey, a byproduct generated during cheese manufacturing process, and studying their role in whey biocontrol activity against phytopathogenic microorganisms. A morphological identification by classic techniques and gene sequencing has been made in order to achieve microbiological characterization of whey from an individual cheese company. A total of 6 species of microorganisms have been identified: Pichia kudriavzevii, Lactobacillus rhamnosus, Lactobacillus fermentum, Lactobacillus helveticus, Lactobacillus zeae and Lactobacillus hilgardii. Biocontrol activity of those identified microorganisms has been tested against different phytopathogenic bacteria and fungus. All lactobacillus identified species showed activity against different bacteria tested. On the other hand only Pichia kudriavzevii and some identified Lactobacillus showed activity against fungus tested. It should be noted that whey biocontrol capability is likely to be related to bacterial activity instead of being due to their excreted metabolites during the fermentation process. This statement arises from the different response against microorganisms tested between both microfiltered and unfiltered whey: While the first did not show any biocontrol activity, the second one did. According to this results, we can conclude that whey could be applied to biological control of crops disease

Quantitative Assessment of the Risk of Release of Foot-and-Mouth Disease Virus via Export of Bull Semen from Israel

Various foot-and-mouth disease (FMD) virus strains circulate in the Middle East, causing frequent episodes of FMD outbreaks among Israeli livestock. Since the virus is highly resistant in semen, artificial insemination with contaminated bull semen may lead to the infection of the receiver cow. As a non-FMD-free country with vaccination, Israel is currently engaged in trading bull semen only with countries of the same status. The purpose of this study was to assess the risk of release of FMD virus through export of bull semen in order to estimate the risk for FMD-free countries considering purchasing Israeli bull semen. A stochastic risk assessment model was used to estimate this risk, defined as the annual likelihood of exporting at least one ejaculate of bull semen contaminated with viable FMD virus. A total of 45 scenarios were assessed to account for uncertainty and variability around specific parameter estimates and to evaluate the effect of various mitigation measures, such as performing a preexport test on semen ejaculates. Under the most plausible scenario, the annual likelihood of exporting bull semen contaminated with FMD virus had a median of 1.3 * 10(-7) for an export of 100 ejaculates per year. This corresponds to one infected ejaculate exported every 7 million years. Under the worst-case scenario, the median of the risk rose to 7.9 * 10(-5), which is equivalent to the export of one infected ejaculate every 12,000 years. Sensitivity analysis indicated that the most influential parameter is the probability of viral excretion in infected bulls

Collective modes of a quasi two-dimensional Bose condensate in large gas parameter regime

We have theoretically studied the collective modes of a quasi two-dimensional (Q2D) Bose condensate in the large gas parameter regime by using a formalism which treats the interaction energy beyond the mean-field approximation. In the calculation we use the perturbative expansion for the interaction energy by incorporating the Lee, Huang and Yang (LHY) correction term. The results show that incorporation of this higher order term leads to detectable modifications in the mode frequencies.Comment: 10 pages, 2 figure

Analytical results for the entanglement dynamics of disjoint blocks in the XY spin chain

The study of the dynamics of entanglement measures after a quench has become a very active area of research in the last two decades, motivated by the development of experimental techniques. However, exact results in this context are available in only very few cases. In this work, we present the proof of the quasiparticle picture for the dynamics of entanglement entropies for two disjoint blocks in the XY chain after a quantum quench. As a byproduct, we also prove the quasiparticle conjecture for the mutual information in that model. Our calculations generalize those presented in [M. Fagotti, P. Calabrese, Phys. Rev. A 78, 010306 (2008)] to the case where the correlation matrix is a block-Toeplitz matrix, and rely on the multidimensional stationary phase approximation in the scaling limit. We also test the quasiparticle predictions against exact numerical calculations, and find excellent agreement. In the case of three blocks, we show that the tripartite information vanishes when at least two blocks are adjacent.Comment: 22 page

On reflected entropy and computable cross-norm negativity: Free theories and symmetry resolution

We investigate a separability criterion based on the computable cross-norm (CCNR), and a related quantity called the CCNR negativity. We introduce a reflected version of the CCNR negativity, and discuss its connection with other well-established entanglement-related quantities, namely the reflected entropy and the operator entanglement entropy. For free fermionic and bosonic theories, we derive exact formulas in terms of two-point correlation functions, which allows for systematic numerical investigations and, in principle, analytical treatments. For systems with a global $U(1)$ symmetry, we study the symmetry-resolved reflected entropy and CCNR negativity. We provide conformal field theory (CFT) results for the charged moments in the case of adjacent intervals, finding perfect agreement with the numerics. We observe an equipartition of reflected entropies and CCNR negativities, both for free fermions and free bosons models. The first charge-dependent correction are conjectured for fermions, and worked out from the CFT calculations for bosons.Comment: 9+2 pages, 3 figure

The Fate of Entanglement

Quantum entanglement is a fundamentally non-local correlation between particles. In its simplest realisation, a measurement on one particle is affected by a prior measurement on its partner, irrespective of their separation. For multiple particles, purely collective types of entanglement exist but their detection, even theoretically, remains an outstanding open question. Here, we show that all forms of multipartite entanglement entirely disappear during the typical evolution of a system as it heats up, evolves in time, or as its parts become separated. These results follow from the nature of the entanglement-free continent in the space of physical states, and hold in great generality. We illustrate these phenomena with a frustrated molecular quantum magnet in and out of equilibrium. In contrast, if the particles are fermions, such as electrons, another notion of entanglement exists that protects bipartite quantum correlations. However, truly collective fermionic entanglement disappears during typical evolution, thus sharing the same fate as in bosonic systems. These findings provide fundamental knowledge about the structure of entanglement in quantum matter and architectures, paving the way for its manipulation.Comment: 15+7 pages single column, 3+3 figures, v2: Improved discussion and SM, v3: New results for fermion genuine multipartite entanglemen

Entanglement negativity between separated regions in quantum critical systems

We study the entanglement between disjoint subregions in quantum critical systems through the lens of the logarithmic negativity. We work with systems in arbitrary dimensions, including conformal field theories and their corresponding lattice Hamiltonians, as well as resonating valence-bond states. At small separations, the logarithmic negativity is big and displays universal behavior, but we show non-perturbatively that it decays faster than any power at large separations. This can already be seen in the minimal setting of single-spin subregions. The corresponding absence of distillable entanglement at large separations generalizes the 1d result, and indicates that quantum critical groundstates do not possess long-range bipartite entanglement, at least for bosons. For systems with fermions, a more suitable definition of the logarithmic negativity exists that takes into account fermion parity, and we show that it decays algebraically. Along the way we obtain general results for the moments of the partially transposed density matrix.Comment: 7+4 pages. v2: Minor improvements and additions in the SM. v3: Title change, improvement of the discussion and broader scope. v4: Published version, new titl

Quasiparticle dynamics of symmetry resolved entanglement after a quench: the examples of conformal field theories and free fermions

The time evolution of the entanglement entropy is a key concept to understand the structure of a non-equilibrium quantum state. In a large class of models, such evolution can be understood in terms of a semiclassical picture of moving quasiparticles spreading the entanglement throughout the system. However, it is not yet known how the entanglement splits between the sectors of an internal local symmetry of a quantum many-body system. Here, guided by the examples of conformal field theories and free-fermion chains, we show that the quasiparticle picture can be adapted to this goal, leading to a general conjecture for the charged entropies whose Fourier transform gives the desired symmetry resolved entanglement $S_n(q)$. We point out two physically relevant effects that should be easily observed in atomic experiments: a delay time for the onset of $S_n(q)$ which grows linearly with $|\Delta q|$ (the difference from the charge $q$ and its mean value), and an effective equipartition when $|\Delta q|$ is much smaller than the subsystem size.Comment: 7 pages, 2 figure