Light Weakly Coupled Axial Forces: Models, Constraints, and Projections

We investigate the landscape of constraints on MeV-GeV scale, hidden U(1) forces with nonzero axial-vector couplings to Standard Model fermions. While the purely vector-coupled dark photon, which may arise from kinetic mixing, is a well-motivated scenario, several MeV-scale anomalies motivate a theory with axial couplings which can be UV-completed consistent with Standard Model gauge invariance. Moreover, existing constraints on dark photons depend on products of various combinations of axial and vector couplings, making it difficult to isolate the effects of axial couplings for particular flavors of SM fermions. We present a representative renormalizable, UV-complete model of a dark photon with adjustable axial and vector couplings, discuss its general features, and show how some UV constraints may be relaxed in a model with nonrenormalizable Yukawa couplings at the expense of fine-tuning. We survey the existing parameter space and the projected reach of planned experiments, briefly commenting on the relevance of the allowed parameter space to low-energy anomalies in pi^0 and 8-Be* decay.Comment: 30 pages, 5 figures, 4 tables. v2: format changed to JHEP, typos fixed, references adde

Structural members comprised of composite wood material and having zones of diverse density

The disclosed invention includes an improved construction of structural members such as railroad crossties, highway spin posts and highway guard posts and to construction of said members from composite wood material including elongated wood flakes and to a method for making such improved structures.https://digitalcommons.mtu.edu/patents/1124/thumbnail.jp

Fan-shaped loader for making a loosely felted mat of aligned wood flakes

Apparatus for forming an elongated continuous mat of elongated wood flakes mixed with a binder and adapted to be compressed to form a densified composite wood product for continuously depositing wood flakes on that supporting surface and for aligning the elongated wood flakes being deposited in mutually parallel relation and in alignment with the direction of movement of the supporting surface. A hopper for containing wood flakes deposits wood flakes into the upper end of a fan-shaped flake loader comprised of a plurality of channels positioned in side-by-side relation and sloping downwardly from the hopper to a supporting surface. The channels are generally V-shaped in cross-section and converge toward their lower ends such that the wood flakes deposited in the upper ends of the channels become aligned in mutually parallel relation as the flakes slide down the channels and are deposited on the supporting surface.https://digitalcommons.mtu.edu/patents/1106/thumbnail.jp

Method and apparatus for making aligned flake composite wood material including integral baffles

A method and apparatus for forming a loosely felted mat of elongated wood flakes mixed with a binder, the mat including a longitudinal axis and the wood flakes being aligned in mutually parallel relation and parallel to the longitudinal axis of the mat. The wood flakes are held in alignment in the mat by a plurality of closely spaced thin planar baffles, the baffles being comprised of a material which can form an integral part of the mat.https://digitalcommons.mtu.edu/patents/1120/thumbnail.jp

Symmetrische Functionen

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Static dropless flake aligner for producing composite wood material

Apparatus are provided for forming a loosely felted mat of elongated wood flakes, the wood flakes being supported on an elongated caul. The flakes are deposited between a plurality of closely spaced parallel baffles so as to be aligned in mutually parallel relation. The caul is supported adjacent the lower edges of the baffles and is support for vertical movement to facilitate buildup of the mat. Apparatus movable back and forth along the length of the caul is provided to deposit wood flakes in an evenly dispursed manner. At least one picker wheel also moves along the length of the baffles, the picker wheel including fingers extending downwardly between baffles and adapted to engage the flakes to cause them to fall between the baffles.https://digitalcommons.mtu.edu/patents/1107/thumbnail.jp

Roman Limes in Serbia: New Researches and Perspectives in Negotin Region

In 2016, the Museum of Krajina in Negotin undertook an extensive field survey of the area under its responsibility to establish the actual state of preservation of the archaeological heritage, eligible for the preliminary list of sites on the Danube limes in Serbia to be nominated for the UNESCO World Heritage List. Till 2023, the Serbian Government, by the Ministry of Culture, financed several archaeological campaigns as well as reconstruction work that have been undertaken at the sites of Aquae (Prahovo), Clevora (Mora Vagei-Mihajlovac), and Laccoburgus (Ćetaće – Radujevac) to shed a new light on this critical and exciting part of Danubian limes. This region was largely and luckily preserved of flooding caused by the construction of the Iron Gate’s electric power system in the last decades of the 20th century. This important fact was one of the primary triggers for contemporary field research. Our contribution tends to expose and discuss the new scientific results that we have obtained so far, as well as to point out the importance of the remains of the Roman cultural heritage of the Negotin area that would significantly add to the growth and development of this region situated on the three-border between Serbia, Bulgaria, and Romania

New Archaeological Investigations on the Upper Moesian Limes. Ćetaće-Radujevac Site, Located in the Roman Aquae Region, at the Confluence of the Timok and Danube Rivers

Given its remarkable location in the vicinity of the confluence of the Timok and Danube rivers, on the Roman limes, as well as indications of very early construction, the site of Ćetaće near the village of Radujevac offers vital evidence for a closer characterization of the whole area of Roman Aquae (Prahovo) in terms of its military, communication, economic, mining and customs operation role. Based on two archaeological campaigns, in 2021 and 2022, and extensive field surveys of the broader area, the site has been determined to have several levels dating from the proto-historical, Roman and early Byzantine periods and retains an inherent military and strategic importance until in the contemporary period. As luck would have it, the site is located on a section of the Danube limes in Serbia which was not endangered by the construction of the hydroelectric power plants on the Danube. As far as the Roman period is concerned, the existence has been attested of the masonry defences and a corner tower of a fort built in the late first century which kept undergoing alterations and additions until the early Byzantine period. The partially established chronology has been confirmed by interesting finds

La localité de Ćetaće au confluent de Timok et Danube sur le limes romain : Sources historiques et recherches archéologiques

On the basis of Procopius' writings and comparison with the factual situation on the ground after three archaeological campaigns, some conclusions could be drawn about the character of the Ćetaće locality and its ancient name.By etymological analysis of the toponyms Βουργονοβορε, one could assume that it is a corrupted name *Βουργονοβο. So *Βουργονοβο would be Romanic *Burgonovo (obviously a prepositional compound Burg-o-novo), in the obvious meaning of "new fortress/town (etc.)" (*Burgus Novus). It fits with the fact that it was built then, in the time of Justinian. Namely, it is about an archeologically confirmed late antique fortification near Radujevac, which, due to the devastation, cannot be explored archaeologically. On the other hand, Λακκοβουργο, the second fortification from Aquae towards Dorticum, since it goes together (τε και) with *Βουργονοβο (*Burgonovo), could be equally a Roman name and a compound. Where does this "κκ" come from? I think it is according to the Greek (co-radical) word λακκος. It would then be Roman *Lacc-o-burgo (Laccoburgus), which would mean "fortress/town (etc.) by/on a lake(s), perhaps also in the sense of some water reservoir, or perhaps by/on to a water tank, close to stagnant water, swamps, etc.'' Taking into account the mentioned data from the sources, the location of the site itself, the results of archaeological research and historical data in terms of the proximity of Aquae, which was the seat of one of the important mining districts of the Danuvii ripa, it could be assumed that there were also mining operations in Ćetaće (Laccoburgus?) perhaps cooling the heated metal with a large amount of water