More Like this

1. Hadron-quark phase transition at finite density in the presence of a magnetic eld: Anisotropic approach

   https://doi.org/doi.org/10.3390/universe7120458  

   E. J. Ferrer and A. Hackebill (May 2022, International journal of modern physics A)

   World Scientific (Ed.)

   We investigate the hadron-quark phase transition at nite density in the presence of a magnetic eld taking into account the anisotropy created by a uniform magnetic eld in the system's equations of state.We fi nd a new anisotropic equilibrium condition that will drive the fi rst-order phase transition along the boundary between the two phases. Fixing the magnetic eld in the hadronic phase, the phase transition is realized by increasing the baryonic chemical potential at zero-temperature. It is shown that the magnetic eld is mildly boosted after the system transitions from the hadronic to the quark phase. The magnetic- eld discontinuity between the two phases is supported by a surface density of magnetic monopoles, which accumulate at the boundary separating the two phases. The mechanism responsible for the monopole charge density generation is discussed. Each phase is found to be paramagnetic with higher magnetic susceptibility in the quark phase. The connection with the physics of neutron stars is highlighted throughout the paper. 

   more » « less
2. A new species of Polyamia DeLong (Hemiptera: Cicadellidae: Deltocephalinae: Deltocephalini) representing the first record of the genus from South America

   https://doi.org/10.11646/zootaxa.4457.4.5  

   DUAN, YANI; DIETRICH, CHRISTOPHER H. (August 2018, Zootaxa)

   Polyamia (Polyamia) choromorica sp. n., representing the first record of the genus Polyamia DeLong from South America, is described and illustrated. Previously described species of Polyamia DeLong appear to be restricted to North America. Color illustrations of Polyamia (Copolyamia) caperata (Ball), Polyamia (Copolyamia) similaris DeLong & Davidson and Polyamia (Polyamia) weedi Van Duzee are also provided for comparison. A species checklist and distribution summary for the genus is provided. Notes on other South American species of Deltocephalini with supernumerary forewing crossveins are also provided. 

   more » « less
3. A Method for Estimating Driving Factors of Illicit Trade Using Node Embeddings and Clustering

   https://doi.org/10.1007/978-3-030-49076-8_22  

   González Ordiano, Jorge Ángel; Finn, Lisa; Winterlich, Anthony; Moloney, Gary; Simske, Steven (April 2020, Mexican Conference on Pattern Recognition)

   The trade on illegal goods and services, also known as illicit trade, is expected to drain 4.2 trillion dollars from the world economy and put 5.4 million jobs at risk by 2022. These estimates reflect the importance of combating illicit trade, as it poses a danger to individuals and undermines governments. To do so, however, we have to fi rst understand the factors that influence this type of trade. Therefore, we present in this article a method that uses node embeddings and clustering to compare a country based illicit supply network to other networks that represent other types of country relationships (e.g., free trade agreements, language). The results offer initial clues on the factors that might be driving the illicit trade between countries. 

   more » « less
4. Understanding extreme rainfall in the Sahel of Southwestern Mali

   https://doi.org/10.1007/s00382-024-07241-y  

   Vizy, Edward K; Cook, Kerry H (June 2024, Climate Dynamics)

   West African Sahel extreme rainfall events cause flooding and property damage, and some areas are more prone to their occurrence. One favorable region is southwestern Mali. NASA IMERG precipitation and ERA5 reanalysis data are used to examine the most extreme boreal summer rainfall events from 2000 – 2019 over southwestern Mali to understand why they form, and to explain why this region has frequent activity. Events are sorted into 4 types based on the timing of the peak rainfall (before or after 00Z) and the associated mid-tropospheric circulation pattern (coastal low or ridge). The coastal low types are associated not with an increase of the low-level inflow of moisture into southwestern Mali, but a weakening of the mid-level westward transport of moisture out of the region. The timing and longevity of the event depends on whether there is a second low to the east in the southern storm track. The coastal ridge types are associated with a build-up of warm, dry air over the western Sahara that leads to a stronger temperature inversion cap over southwestern Mali, allowing instability to build beneath the cap. How fast the cap dissipates and whether there is synoptic activity to the east in the southern or northern storm track determines when convective activity occurs. Thus, southwestern Mali is exposed to coastal lows and ridges in addition to the Saharan heat low and the summer southern storm track for African easterly wave disturbances. The confluence of these factors makes southwestern Mali a region conducive for convective rainfall activity. 

   more » « less
5. Two new species of Mendozellus Linnavuori (Hemiptera: Cicadellidae: Deltocephalinae: Deltocephalini) with redescription of Mendozellus asunctia Cheng

   https://doi.org/10.11646/zootaxa.4232.2.6  

   DUAN, YANI; DIETRICH, CHRISTOPHER H.; ZHANG, YALIN (February 2017, Zootaxa)

   Mendozellus paralaredanus sp. n. from Uruguay and M. rakitovi sp. n. from Peru are described. M. asunctia Cheng is redescribed, the ovipositor is illustrated for the first time, and newly recorded from Argentina. M. serratus DeLong is transferred to Haldorus Oman based on the male genitalia structure, creating the new combination H. serratus (DeLong), comb. n. A checklist and key to species of Mendozellus are provided. 

   more » « less