Journal articles on the topic 'Double-sphere pore'

The demand for improved energy storage technologies will increase significantly in coming years, as global ambitions move towards a net-zero future and intermittent renewable energy sources make up a larger proportion of the total energy mix. To meet this demand, worldwide storage technologies must be diversified to include modern electrochemical energy storage, such as batteries and supercapacitors, at handheld-, household- and grid-scale capacities. Supercapacitors represent a promising alternative and complementary electrochemical storage method to traditional batteries. They possess cycle lifetimes and power densities far superior to batteries, allowing much faster charging and discharging, but currently lag behind in energy density. Additionally, they are more environmentally friendly than batteries through having no reliance on toxic metals such as lithium. However, the most common formulations for supercapacitor electrode coatings in the literature continue to use hazardous solvents. One of the most common polymer/solvent combinations is polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone (NMP). NMP is very hazardous to human health and has recently been classified as a “Substance of Very High Concern” by the European Chemicals Agency, leading to use restrictions within the EU. As such, there is an urgent requirement for greener alternatives. This work explores a variety of alternative, greener solvents for PVDF dissolution, examining their effects on the properties and performance of electric double-layer capacitor (EDLC) electrodes, in comparison to NMP. The research aims to find a green solvent with comparable electrochemical performance and physical properties, alongside a much lower health and environmental impact. Dimethyl sulfoxide (DMSO), γ-valerolactone (GVL), triethyl phosphate (TEP) and Cyrene (dihydrolevoglucosenone) have been investigated; chosen based on their Hansen Solubility parameters and position within the Hansen solubility sphere for PVDF. The electrodes have been analysed morphologically using scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX), and nitrogen adsorption-desorption analysis (BET), to identify any differences in coating performance and pore structure. A particular focus has been placed on electrochemical testing of EDLC electrodes fabricated using these coatings. Three-electrode testing in aqueous electrolyte has comprised cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), electrochemical impedance spectroscopy (EIS) and electrode cycling over 2000 charge-discharge cycles. In this work we show that electrodes produced using Cyrene outperformed the specific capacitance and capacitance retention of all tested solvents, including control NMP samples, across the whole range of current densities from 0 to 200 Ag-1. Electrodes have also been produced for each solvent using either activated carbon or graphene nanoplatelets as the active material, to confirm that the results are comparable for different carbon structures. This has allowed comparison of the electrochemical properties between the two carbon materials. In addition, each solvent has been assessed for suitability for carbon-incorporated polymer nanowires production for supercapacitor electrode application. This could open the doors to developing environmentally friendly, freestanding electrodes for fast-charging electrical energy storage devices. Figure 1

The interphase nucleus in secondary sporidia of Tilletia foetida consists of mostly diffuse chromatin, one or two nucleoli, and an area of heterochromatin located opposite an electron-dense, extranuclear spindle pole body (SPB). The interphase SPB is an oval- to bar-shaped, double-structured disc that has a crystallinelike substructure. During nuclear migration into nascent sporidia, SPBs and nucleoli are randomly oriented. At the onset of division, chromatin begins to condense and the SPB becomes located on a nuclear protuberance. Cytoplasmic microtubules terminate at the SPBs and multivesicular bodies surround the SPBs from the early stages of SPB division to early postdivision. SPB discs become spheroid and each develops a medial, dense layer. Then, a basal, dense layer develops and elongates as the SPBs separate and become positioned on opposite sides of the nuclear protuberance. The nuclear membrane opens opposite the SPB during SPB division. The nucleolus is extruded into a nuclear bleb and degenerates. SPBs migrate to opposing sides of the nucleus and become diffuse as a microtubular spindle develops between them. Some spindle microtubules terminate at dense chromatin patches that are contiguous with the major mass of chromatin surrounding the spindle. During late division stages, spindle microtubules often appear to be closely juxtaposed. Except for polar openings adjacent to the SPBs, the nuclear membrane is entire until late division when it degenerates in the midregion of the nucleus. During early postdivision, the SPB condenses into a small, dense sphere as the chromatin and heterochromatin opposite the SPB become diffuse. The SPB then elongates into a dense bar and SPB material increases, except at the midportion, reforming the double structure of interphase.

(1) Background: The mutual relationship between evolution and learning is a controversial argument among the artificial intelligence and neuro-evolution communities. After more than three decades, there is still no common agreement on the matter. (2) Methods: In this paper, the author investigates whether combining learning and evolution permits finding better solutions than those discovered by evolution alone. In further detail, the author presents a series of empirical studies that highlight some specific conditions determining the success of such combination. Results are obtained in five qualitatively different domains: (i) the 5-bit parity task, (ii) the double-pole balancing problem, (iii) the Rastrigin, Rosenbrock and Sphere optimization functions, (iv) a robot foraging task and (v) a social foraging problem. Moreover, the first three tasks represent benchmark problems in the field of evolutionary computation. (3) Results and discussion: The outcomes indicate that the effect of learning on evolution depends on the nature of the problem. Specifically, when the problem implies limited or absent agent–environment conditions, learning is beneficial for evolution, especially with the introduction of noise during the learning and selection processes. Conversely, when agents are embodied and actively interact with the environment, learning does not provide advantages, and the addition of noise is detrimental. Finally, the absence of stochasticity in the experienced conditions is paramount for the effectiveness of the combination. Furthermore, the length of the learning process must be fine-tuned based on the considered task.

The doctrine of the burden of proof must face, as the pole of its argument, its connection with the Constitution and that it must assume that the doctrine of onus probandi projects a formulation that goes beyond its strict procedural conceptualization of the "ordinary" to access the sphere of constitutional guarantee, because a jurisdictional declaration of right cannot be refused when a party's burden of proof is aided by both the preemption of defenselessness and the right to use appropriate means of proof to substantiate - prove - its claim. It must be declared essential that recognition of the constitutional right to the burden of proof is correlated with the constitutional right to effective judicial protection. The Constitution, in addition, places this recognition in the procedural part without the possibility to recognize the relative recognition of the constitutional right as the burden of proof in the judge and which can justify the ex officio evidence of the part of the judge (in part). In the European model, the constitutional right to the burden of proof is correlated with the constitutional right to effective judicial protection, which is not characterized by its uncertainty or casuism - that is, when the burden of proof should apply in a civil process - but, on the contrary, by the constitutional recognition of a specific and specific constitutional right and the guarantee provided by the Constitution. Without constitutional recognition of the right to the burden of proof, it would be impossible to achieve effective judicial protection, since the use of "evidence for their protection" is essential for the party to have access to it - to effective judicial protection. Burden of proof rules have a double dimension. On the one hand, they affect the parties because they indicate the need to prove their claims and the scope of the right to prove what they have in the process. On the other hand, they are the only way out of the crossroads in which the court may find itself when it doubts the authenticity of the facts proved, either because they have not been proved, or because the evidence was insufficient or unsatisfactory. This decision consists in ruling against the party who has failed to prove the facts in question, constituting a factual presumption of the supremacy of the law sought to be enforced.

Abstract Porous carbon is well known as a good candidate for the development of electrochemical double-layer capacitors. Predominantly, many conventional carbons are microporous and often well described by the assumption of slit pore geometry. However, there is a class of carbons that is significantly different from the others, namely templated mesoporous carbons. In this work, we study electrosorption-induced deformation in CMK-3-like mesopores having nonconvex geometry applying a mean-field approach. The model is based on the modified Poisson-Boltzmann equation taking into account the excluded volume of the ions within the hard-sphere model in the Percus-Yevick approximation. We assume that the deformation is caused by two effects: ion osmotic pressure and electrostatic interactions of the electric double layers on charged rods. The latter were calculated via the Maxwell stress tensor agreeing with the modified Poisson-Boltzmann equation. We estimated the pore-load modulus of the CMK-3-like material and found an agreement with the previously obtained values by small-angle neutron scattering (SANS) data analysis. Additionally, we studied the differential capacitance in the non-convex pore geometry and found that the behavior of the differential capacitance profiles was similar to that of the profiles obtained for flat electric double layers. Namely, we obtained the crowding regime at rather high voltages and more pronounced profile asymmetry with increasing differences in the ionic sizes.

Pore-resolved direct numerical simulations have been performed to investigate the turbulent open-channel flow over a rough and permeable sediment bed, represented by a mono-disperse random sphere pack. After a careful validation, eleven cases were simulated to systemically sample a parameter space spanned by a friction Reynolds number $Re_\tau \in [150, 500]$ and a permeability Reynolds number $Re_K \in [0, 2.8]$ . By varying the ratio of flow depth to sphere diameter within a range of $h/D \in \{ 3,5,10,\infty \}$ , the influence of both Reynolds numbers on the flow field and the turbulence structure could be investigated independently. The simulation results are analysed within a time–space double-averaging framework, whereas flow visualizations provide insight into instantaneous fields. Based on the drag distribution, we propose a consistent interface description, which can be used to define both near-interface and outer-flow coordinates. In these near-interface coordinates, the profiles of the mean velocity and the total shear stress collapse. Furthermore, the proposed interface definition yields outer-layer coordinates, in which the flow and turbulence statistics over a rough and permeable bed reveal similarity to a smooth-wall flow at a similar $Re_\tau$ . Within the parameter space, $Re_\tau$ has a strong influence on the wake region of the velocity profile. In contrast, $Re_K$ changes the wall-blocking effect and the shear intensity, which is reflected by the turbulence structure and vortex orientation in the near-interface region. As streamwise velocity streaks disappear and the vortex inclination increases with higher $Re_K$ , differences between near-interface and outer-layer turbulence structure are reduced.

Abstract A four-state one-dimension discrete spin model with the nearest neighbor and partial next nearest neighbor lattice interactions is proposed for describing electrical double layer formed by ionic liquid in cylindrical pore that can accommodate only one row of particles. The model, in which cation is modelled as a dimer formed by two hard spheres: one is positively charged with diameter , while the other is neutral with diameter , and anion is modeled by charged hard sphere with diameter , is designed to investigate effects of pore diameter , ion transfer free energy, ion size and electrical valence on behaviors of specific differential capacitance and specific energy storage and its saturation value . Relevant Kramers-Wannier transfer matrix is , which gives system partition function by numerically solving maximum real root of the relevant characteristic equation. Main findings are briefly described below. (i) The ion valence has little effect on the value, but does reduce the threshold voltage strength , beyond which the energy storage reaches . However, the ion valence (whether co- or counter-ion) raises both the and values as the relevant ion size decreases enough. (ii) Decreasing of the value weakly reduces the value, but raises the peak height and the value obviously; correlation between the value and value becomes stronger with the ions getting more pore hostile. (iii) With the counter-ion or co-ion charged site size decreasing, both the value and value rise. However, the effect of the co-ion charged site size is weakened as the co-ion gets more pore hostile, and the cation neutral site size influences on the value less than the cation charged site size does. (iv) Pore friendly co-ion or pore hostile counter-ion always helps in raising the value; the two have significant synergistic effect with the co-ion pore friendliness playing more important role than the counter-ion pore hostility.

Abstract A five-state modified BEG model is proposed for describing aqueous electrolyte in cylindrical pore so narrow that only one row of particles can be stationed. Two properties the closest to the actual situation of the aqueous electrolyte are integrated into the model: cation is dimer comprised of two tangentially tethered hard spheres of different diameters: one is charged, while the other is neutral, and solvent is modeled as neutral hard sphere with an electric dipole. The system partition function is obtained by numerically solving maximum real root of characteristic equation of Kramers-Wannier transfer matrix. The present theory reduces to that by the Rochester et al by making both the cation neutral sphere size and electric dipole moment of the solvent equal to zero. The model is used to investigate effects of cation shape and electric valence, solvent electric dipole moment, and cylindrical pore radius on specific differential capacitance and specific energy storage in electric double layer supercapacitor formed inside the cylindrical pore. Main findings are briefly described below. (i) With dimer counter-ion electric valence changing from 1 to 2, the peak becomes higher, and the peak position becomes nearer to the zero charge potential; as a comprehensive effect of these changes, the dimer counter-ion electric valence does not exert obvious influence on the saturation value , but reduces the threshold electrode potential strength , beyond which the value is just and approximately reached. (ii) Whether the dimer counter-ion is monovalent or bivalent, the peak height and the value tend to rise with the dimer neutral site size decreasing, but influence of the value on the value is very small. Only when the value is small enough, the value rises a little with decrease of the value. (iii) Increase of solvent electric dipole moment (wheth

The problem about steady-state temperature distribution in a homogeneous isotropic medium containing a pore or an insulating inhomogeneity formed by two coalesced spheres of the same radius, under arbitrarily oriented uniform heat flux, is solved analytically. The limiting case of two touching spheres is analyzed separately. The solution is obtained in the form of converged integrals that can be calculated using Gauss-Laguerre quadrature rule. The temperature on the inhomogeneity's surface is used to determine components of the resistivity contribution tensor for the insulating inhomogeneity of the mentioned shape. An interesting observation is that the extreme values of these components are achieved when the spheres are already slightly coalesced.

Based on data from pore-resolved direct numerical simulation of turbulent flow over mono-disperse random sphere packs, we evaluate the budgets of the double-averaged turbulent kinetic energy (TKE) and the wake kinetic energy (WKE). While TKE results from temporal velocity fluctuations, WKE describes the kinetic energy in spatial variations of the time-averaged flow field. We analyse eight cases which represent sampling points within a parameter space spanned by friction Reynolds numbers $Re_\tau \in [150, 500]$ and permeability Reynolds numbers $Re_K \in [0.4, 2.8]$ . A systematic exploration of the parameter space is possible by varying the ratio between flow depth and sphere diameter $h/D \in \{ 3, 5, 10 \}$ . With roughness Reynolds numbers of $k_s^+ \in [20,200]$ , the simulated cases lie within the transitionally or fully rough regime. Revisiting the budget equations, we identify a WKE production mechanism via viscous interaction of the flow field with solid surfaces. The scaling behaviour of different processes over $Re_K$ and $Re_\tau$ suggests that this previously unexplored mechanism has a non-negligible contribution to the WKE production. With increasing $Re_K$ , progressively more WKE is transferred into TKE by wake production. A near-interface peak in the TKE production, however, primarily results from shear production and scales with interface-related scales. Conversely, further above the sediment bed, the TKE budget terms of cases with comparable $Re_\tau$ show similarity under outer-scaling. Most transport processes relocate energy in the near-interface region, whereas pressure diffusion propagates TKE and WKE into deeper regions of the sphere pack.

Abstract We study string corrections to one-loop amplitudes of single-particle operators $$ \mathcal{O} $$ O p in AdS5×S5. The tree-level correlators in supergravity enjoy an accidental 10d conformal symmetry. Consequently, one observes a partial degeneracy in the spectrum of anomalous dimensions of double-trace operators and at the same time equality of many different correlators for different external charges pi=1,2,3,4. The one-loop contribution is expected to lift such bonus properties, and its precise form can be predicted from tree-level data and consistency with the operator product expansion.Here we present a closed-form Mellin space formula for $$ \left\langle {\mathcal{O}}_{p1}{\mathcal{O}}_{p2}{\mathcal{O}}_{p3}{\mathcal{O}}_{p4}\right\rangle $$ O p 1 O p 2 O p 3 O p 4 at order (α′)3, valid for arbitrary external charges pi. Our formula makes explicit the lifting of the bonus degeneracy among different correlators through a feature we refer to as ‘sphere splitting’. While tree-level Mellin amplitudes come with a single crossing symmetric kernel, which defines the pole structure of the AdS5× S5 amplitude, our one-loop amplitude naturally splits the S5 part into two separate contributions. The amplitude also exhibits a remarkable consistency with the corresponding flat space IIB amplitude through the large p limit.

morale per esprimere le varie dimensioni del ragionamento morale e descrivere le condizioni necessarie perché si possa porre un atto, in tutte quelle situazioni in cui capita di dover scegliere di compiere un dato bene, accettando, accanto agli effetti positivi voluti, gli effetti negativi collaterali che possono derivare dalla scelta di quel bene. L’ambito di applicazione di tale principio è assai vasto ed esso è stato accolto anche all’interno della bioetica e applicato in relazione alle questioni di inizio e fine vita (particolarmente nell’ambito della bioetica clinica), della ricerca scientifica e della difesa dell’ambiente. Il ricorso a tale principio, tuttavia, non è esente da fraintendimenti, in primo luogo, di carattere metodologico: il processo di applicazione, infatti, è di per sé equivoco nel momento in cui il principio stesso si pone come giustificazione morale dell’atto, piuttosto che come criterio guida. L’obiettivo di questo articolo è quello di chiarire quale sia l’utilità del PADE e, soprattutto, se ed in quali termini si debba ricorrere ad esso in bioetica, al fine di arrivare alla soluzione di taluni problemi dall’agire morale che sorgono nell’ambito medico. Attraverso una disamina di alcuni casi paradigmatici, l’Autore sottolinea il valore essenzialmente strumentale del PADE, mettendo in luce come il contributo maggiore che viene da questo principio è quello di essere fondamentalmente un aiuto per affinare l’analisi dell’atto, in quelle situazioni in cui l’esito di talune azioni può produrre degli effetti collaterali. ---------- The principle of the act with double effect (PADE) rises in moral theology to express the various dimensions of the moral reasoning and to describe necessary conditions so that an action can be set, in all those situations in which it happens one must choose to achieve a given good, accepting, besides the intended positive effects, the negative side effects that can derive from the choice of that good. The sphere of application of such principle is wide and it has also been welcomed into bioethics and applied in relationship to the issues of beginning and end of life (particularly within the clinical bioethics), scientific research and environmental protection. The recourse to such principle, yet, is not exempted by methodological misunderstanding: the process of application, in fact, is by itself equivocal in the moment in which the same principle sets it as moral justification of the action, rather than as guide criterion. The aim of this paper is to clarify what the utility of the PADE is and, above all, whether and in what terms it must be used in bioethics, to reach the solution of some moral problems rising from medical context. Through an examination of some paradigmatic cases, the author underlines the instrumental value of the PADE, showing how the main contribution that comes from this principle is that of being basically an aid to sharpen the analysis of the act in all those situations in which the result of some actions can produce some side effects.

El artículo trata de la conexión entre relaciones de poder, sociedad, Estado y medio ambiente. Tiene como objetivo presentar el abordaje contrahegemónico de la cuestión ambiental desarrollada por los movimientos que, en diferentes países, constituyen lo que, en los últimos tiempos, ha sido denominado ecosocialismo. Para ello, metodológicamente, el artículo se apoya en dos premisas: una revisión bibliográfica y un análisis de documentos fundacionales (como manifiestos) del ecosocialismo. Entre los resultados alcanzados, pueden ser resaltados, por ejemplo, los siguientes: i) el ecosocialismo concibe al Estado como un campo de disputa; ii) los problemas ambientales se derivan, sobre todo, de la lógica capitalista de producción y acumulación; iii) la crisis ecológica no puede superarse en los marcos de la acumulación de capital; iv) la Educación Ambiental Ecosocialista propone romper con los esquemas de pensamiento tradicionales, así como llevar a cabo una batalla cultural para descolonizar el imaginario popular de fenómenos como el consumo de productos perjudiciales e inútiles. En forma de consideraciones conclusivas, se enfatiza, por ejemplo, una doble inferencia analítica: Por un lado, el ecosocialismo adecuadamente no rechaza al Estado como esfera de disputa hegemónica, y, por otro, su base teórica carece de más formulaciones en lo que se refiere a la transición hacia una nueva organización económica.
 
 O artigo trata da conexão entre relações de poder, sociedade, Estado e meio ambiente. Tem como objetivo apresentar a abordagem contra-hegemônica da questão ambiental desenvolvida pelos movimentos que, em diferentes países, constituem o que nos últimos tempos, tem sido denominado ecossocialismo. Para tanto, metodologicamente, o artigo apoia-se em dois pressupostos: uma revisão bibliográfica e uma análise de documentos fundacionais (como manifestos) do ecossocialismo. Dentre os resultados alcançados, podem ser realçados, por exemplo, os seguintes: i) o ecossocialismo concebe o Estado como um campo de disputa; ii) os problemas ambientais resultam, sobretudo, da lógica capitalista de produção e acumulação; iii) a crise ecológica não pode ser superada nos marcos da acumulação de capital; iv) a Educação Ambiental Ecossocialista propõe romper com os esquemas de pensamento tradicionais, bem como levar a cabo uma batalha cultural para descolonizar o imaginário popular de fenômenos como o consumo de produtos prejudiciais e inúteis. Em forma de considerações conclusivas, enfatiza-se, por exemplo, uma dupla inferência analítica: Por um lado, o ecossocialismo adequadamente não recusa o Estado como esfera de disputa hegemônica, e, por outro, a sua base teórica carece de mais formulações no que diz respeito a transição para uma nova organização econômica. 
 
 The article focuses on the connection among relations of power, society, State and the environment. It aims to present the counter-hegemonic approach to the environmental issue developed by the movements that, in different countries, constitute what, in recent times, has been called ecosocialism. To achieve this, the article is based on two presuppositions: a bibliographical review and an analysis of foundational documents (like manifestos) of ecosocialism. Some of the results found out are as follows: 1) ecosocialism conceives the State as a field of political dispute; 2) the environmental problems result mainly from the capitalist logic of production and accumulation; 3) the ecological crisis cannot be overcome within the framework of capital accumulation; 4) the Ecosocialist Environmental Education proposes to break with traditional thinking schemes, as well as carry out a cultural battle to decolonize the popular imaginary of phenomena such as the consumption of harmful and useless products. In conclusive way, it’s emphasized, for example, a double analytical inference: On the one hand, correctly, ecosocialism does not reject the State as a sphere of hegemonic dispute, and, on the other hand, its theoretical basis needs more formulations regarding the transition to a new economic organization.
 Keywords: Environment, ecological crisis, ecosocialism, environmental education.

History, State of and Necessity for Research on the Roman and Migration Period Military Equipment from Poland. Subjective Approach (Despite Good Intentions)Significant studies on military equipment from the Roman Period have been initiated by Martin Jahn (1916a; 1921). For many years his works have been the main point of reference for research on weaponry of the Germanic peoples. This picture has not been changed radically by the post-war works of Klaus Raddatz, devoted mostly to the Germanic military equipment in the Late Pre-Roman Period (1966), Younger Roman Period (1967), and wide spectrum from the Late Pre-Roman until the Migration Period (1985). Although important at the time, they were insufficiently involving inner cultural diversity of the ‘Germanic’ world, presenting the issue from the first and foremost northern European perspective.After the war the studies on weaponry of the Central European Barbaricumhave been based mostly on the materials of the Przeworsk culture, due to abundance of military equipment in graves of this cultural unit. It is achronicler’s duty to mention rather unsuccessful work of Janina Elantkowska (1961), but then underline also the fundamental works of Kazimierz Godłowski in the field of chronology of weapon graves (1970; 1992; 1994), enabling further, more precise works on armaments of the Przeworsk culture. This scholar has educated several hoplologists, experts in archaeological military equipment (active – just like him – at the Jagiellonian University) who broaden the knowledge in this field considerably. Among those one should name especially Piotr Kaczanowski (1988) – the author of the studies on inlaid pole weapon heads, finds of imported weapons from the area of Barbaricum (Kaczanowski 1992) or the classification of heads of shafted weapons from the Przeworsk culture (Kaczanowski 1995). The latter is especially important, because establishing typologies and chronology of the pole weapon heads enabled further studies on military equipment in multiple aspects, thanks to the ability to precisely date graves equipped only with spear- or javelin heads, until that time dated very widely. Equally important person ‘descended’ from Kraków is Marcin Biborski, to whom academics owe research on Barbarian and Roman swords from the Barbarian Europe (Biborski 1978; 1994a; 1994b; 1994c; 1994d; Biborski, Ilkjær 2006); he has also begun the discourse on the ritual weapon destruction (Biborski 1981), as well as decorations of shafted weapon heads and swords (1986). Both aforementioned researchers have initiated the metal analysis of swords, which enabled devising of criteria for identification of the Roman imports (Biborski et alii1982; 2003). In the Kraków’s academia the classification of spurs has also been developed (Ginalski 1991), as well as axes (Kieferling 1994). Acomplement to the abovementioned is the study of weapon sets from graves, i.e. Germ. Waffenkombination issue (Kontny 2001; 2002; 2003a; 2008b), and – embracing broader territorial range – studies on pole weapon heads ornamented with astitch-like pattern (Kontny 2008a) and negative ornament on their blades (Kontny 2017a), or an eye-motif decoration placed at the sockets (Czarnecka, Kontny 2008), as well as the newest registers of watery deposits of weapons from the area of Poland (Kontny forthcoming b).Piotr Kaczanowski has also initiated the studies on weaponry of the Wielbark culture (Kaczanowski, Zaborowski 1988). Due to the specifics of burial rituals (taboo on weapons in grave goods) the research on arms of the Wielbark culture has arather short history. In the aforementioned work singular finds of weapons from graves have been used, interpreted by enduring traditions of the Oksywie culture – in the period of the Wielbark culture formation – or the Przeworsk culture – at the former areas of this cultural unit, later occupied by the Wielbark culture peoples. What was used there abundantly was the archival source – the files of Martin Jahn, in which one could find notes and sketches presenting finds of weapons from, i.a. Pomerania. However, the authors did not refer to written sources, especially very important remark of Tacitus (Tacyt, Germania 44, 1) about short swords and round shields, which were supposed to be distinctive for the peoples of Gotones, Rugii, and Lemovii, associated with the area of the Wiebark culture. This gap has been filled, which gave an opportunity for verification of the part of archaeological sources for reconstruction of the Wielbark military equipment and complementing their list (Kontny 2006a; 2008d).The usefulness of the accounts of Tacitus for the reconstruction of weapons from the Roman Period occurred to be insignificant, but it came to light that the Roman author had not always used the contemporaneous sources (the aforementioned description fits the picture of weaponry of the Oksywie culture). Discoveries of further Wielbark military objects as well as the renewed analysis of the discovery from Żarnowiec (Kontny 2006b) considerably broaden the database of sources and were used to formulate the working hypothesis about the influence of the Przeworsk model on the Wielbark military equipment in the Early Roman and the beginnings of the Younger Roman Period, later replaced by the Scandinavian pattern (Kontny 2006b, 152; 2008d, 195). The probability of this concept grew, since the analysis of male belts led to similar inferences (Madyda-Legutko 2015). Therefore, the need for verification of the suggested picture occurred, with the use of possibly complete corpus of Wielbark military finds; all the more because the issue was complicated by the discovery of the inhumation burial with asword and sword bead in Juszkowo near Pruszcz Gdański, i.e. in the area of the important settlement centre of the Wielbark culture. The grave is dated to the time of the decline of this cultural unit (Dyrda, Kontny, Mączyńska 2014; Kontny, Mączyńska 2015). In effect, the synthesis of the Wielbark military equipment has been developed (Kontny 2019a, 69–113), in which it was possible to confirm the Przeworsk inspirations to Wielbark armaments in the Early Roman Period and subphase C1a, as well as to notice later influences of the northern European weaponry model. What was added to this picture was the probable introduction into the sphere of nomadic influences in the terminal stadium of the Wielbark culture, suggesting, that it was in fact the eastern-Germanic-type weaponry then, in which the nomadic influences are quite noticeable, manifesting in the adaptation of bow and trilobate arrows with rhomboid blades, as well as spathae of the Asian type. It was also possible to classify some conceptions formulated in the pioneering work; thus, the suggestion of the Wielbark origins of the negative ornament on shafted weapon heads has been rejected (Kontny 2017a), as well as the one about the important role of abow in the Wielbark armamentarium (Kontny 2019a, 85–87). On the other hand, in the light of current research the idea of the axes’ importance seems valid (Kontny 2019a, 83–85; 2019c,154–158).As opposed to the weapons, the Wielbark spurs were analyzed on multiple occasions. The newest classification of Wielbark spurs (Smółka 2014, 48–51) was mentioned only in the form of summary of the unpublished M.A. thesis and therefore it is hard to refer to it in details and evaluate it. It is beyond doubt, however, that spurs from the Early Roman and the beginnings of the Younger Roman Period, in principle, were based on Przeworsk forms – with obvious differences in material (the lack of iron examples in graves, which is conditioned by the burial rituals), slight morphological ones, as well as the larger popularity of the chair-shaped examples (Germ. Stuhlsporen). In the later timespan one should notice more explicit northern European influences, although along with the preservation of arangeof local forms (Kontny 2019a, 87–88), and at the dawn of the Wielbark culture’s existence one might indicate the examples of spurs having been imported or inspired by Roman solutions (Kontny 2020, 673–675; Kontny, Michalak 2020). These observations, to the large extent, inscribe into the general dynamics of changes in the Wielbark military equipment. Asaresearch objective one should recognise the intensification of studies on watery deposits, as at some sacrificial sites of this kind Wielbark-culture arms have been discovered.In the last few years there has been ahuge advancement in the research on weapons of the West Balt cultural circle from the area of north-eastern Poland. This issue has been basically unrecognised until recently, and the progress is owed to discovery and dissemination of the archives and collections of the former Prussia-Museum, as well as private files of scholars active in the pre-war period. Currently the researchers have at their disposal the studies on Bogaczewo and Sudovian cultures’ swords from the Roman Period (Kontny 2017b; see Nowakowski 1994; 2007) as well as seaxes of the Elbląg and Olsztyn group from the Late Migration Period (Kontny 2013a; 2019a, 142–147; see Prassolow 2018). Besides, the idea of the use of battle knives has been rejected, as they were too short to serve this purpose (Kontny 2019a, 128–129). The earliest (Kontny 2007a) and latest (Kontny 2008c) finds of weapons from Bogaczewo culture have been elaborated, which allowed to establish the timeframes of the phenomenon of including weapons in grave inventories: from the dawn of the Late Pre-Roman Period until subphase C1b. Particular categories of blunt weapons have been comprehensively analyzed, i.e. socketed axes (weapon characteristic for the West Balt circle and some areas of eastern Europe) and axes from Bogaczewo and Sudovian cultures (Kontny 2016a; 2018). Furthermore, the issue of using the organic blunt weapons has been introduced, which popularity in the Balt milieu is suggested by the Tacitus’ remark about fustis. It has been established (Kontny 2015a) that such weapon has been used in the West Balt Barrows culture, but most probably it has not played any important role in the Roman Period, and the account of Tacitus is (in this aspect) anachronic. Elaboration of shafted weapon heads (Kontny 2007b) has shown that examples from the Bogaczewo culture imitate solutions known from the Przeworsk culture, although they show some local features (e.g. asocket is frequently mounted on ashaft with ause of asingle nail, and not rivet, as it was in the Przeworsk culture). On the other hand, in the Sudovian culture similar inspirations might be indicated only in the earliest stadium of its development and they are rather scarce. Shafted weapons match, however, the Lithuanian pattern, proposed by Vytautas Kazakâvičius (Kazakâvičius 1988, 12–63). One can also encounter here the Scandinavian imports. In the case of the Sudovian culture it was also possible to attempt to reconstruct sizes of shafted weapons, thanks to the analysis of the position of their heads in inhumation graves (Kontny 2019a, 119–124). It was also indicated that the significance of javelins in both cultures is rather scarce, which manifests in the sporadic presence of more than one weapon head in grave inventories (Kontny 2019a, 119, table 1), as well as the sparsity of barbed heads (Nowakowski 2014). The influences of the Przeworsk culture are noticeable also in the decorations of weapon heads (see: Kontny 2008a; 2017a; Czarnecka, Kontny 2008). Only recently the topic of bow and arrows from the Bogaczewo and Sudovian cultures has been introduced. They were mainly used for hunting purposes (Kontny 2019a, 137–139). Equine equipment is quite well-represented in the Balt area, the proof of which are quite numerous finds of headgear and horse tack with chain reins, requiring – similarly to spurs – comprehensive studies (see Kontny 2019a, 139–141). On the presented background the research on Balt shields from the area of Poland seems at adisadvantage. It is necessary to challenge the possibility of an uncritical use of the (still incomplete) classification of middle-European shield-bosses and grips for the analysis of the Balt examples, as they indicate adifferent rhythm of popularity and morphological development, and in the same time also arange of primitive features (shield-bosses assembled from two parts, joint with rivets) and archaisms in construction (e.g. many attaching points at the brim; using big disc-headed nails and rivets as late as the Roman Period). It is also important to notice the large diversification in morphology of shield-bosses with blunt apex and probability of popularity of wooden shield-bosses (Kontny 2019a, 132–133, fig. 25), as well as the use of metal supports of shield constructions (Kontny 2019a, 136, fig. 30). The reconstruction of the shape of Sudovian culture shields was also proposed, on the basis of the location of shield elements in inhumation graves (Kontny forthcoming a).Numerous are the finds of the military equipment of the so-called Lubusz group (see the paper by Bartłomiej Rogalski in the hereby volume), located by the lower Oder River in the Early Roman Period and the beginnings of the Younger Roman Period. Distinctive feature of this cultural unit is the use of cremation and including into graves burnt and sometimes – by the Przeworsk custom – destroyed weapons. Studies of this issue still have not been fully published, although it has been approached for some time now (Wołągiewiczowie 1964); aM.A. dissertation was even written on this topic (Czarnecka 1995). The theses, which have been included there, became obsolete due to the rapid increase in the archaeological record, i.a. thanks to the fieldwork at the necropolis in Czelin, as well as the lake sacrificial site in Lubanowo. On the basis of the hitherto observations, it has to be acknowledged that the model of the military equipment is very similar to the solutions known from the Przeworsk culture (Kontny 2019b, 349). The forms of shafted weapon heads, single- or double-edged 74B. Kontnyswords, shield-bosses, grips, and even arrowheads and spurs (with the documented exam-ples of the so-called bow-shaped – Germ. Bügelsporen – and chair-shaped spurs correspond with the Przeworsk prototypes. There are no axes known from burial grounds of the Lubusz group so far, which diversifies it from the Wielbark-culture armament, and shows even more ties with the military equipment of the Przeworsk culture. However, their presence has been confirmed at the sacrificial sites; it is possible that the weapons discovered there have been seized from the defeated Wielbark-culture invaders from the east (similar interpretation is accepted for the analogical northern European deposits). Scarce examples of weapons from the dawn of the Lubusz group refer to the solutions known from Scandinavia. It is thus probable that the change, which can be observed here, is analogous to the process known from the Wielbark culture.Basically unrecognised remains the military equipment of the Dębczyno group, which superseded the Wielbark culture in Western Pomerania in the Younger Roman Period and functioned until the Migration Period. Also in the case of Luboszyce culture what is lacking is the synthetic approach towards the issue of military equipment from the typological and chronological point of view. The finds of weapons were collected in the monograph of this culture; the attention has been paid in this case to the diversity from the Przeworsk model of military equipment, expressed in the use of axes (their classification was proposed); singular ties to the Scandinavian patterns have been observed (Domański 1979, 43–54), although one cannot find here comprehensive analysis of the issue. Adissertation devoted to military equipment of the Luboszyce culture has been written lately; unfortunately, it was not printed (Demkowicz 2014); only some of the issues approached there were published (Andrzejewska, Demkowicz 2015a; 2015b; 2016). They indicate the emulation – with slight modifications – the Przeworsk-culture model of weaponry in the early phases of development of the Luboszyce culture (phase C1), which might be indicated e.g. by the forms of shafted weapon heads and spurs, while new elements, such as asymmetric axes parallel to the ones known from the Elbe region, became numerous only from the C2 phase (Andrzejewska, Demkowicz 2015a; 2015b; 2016). Scandinavian elements are represented i.a. by the knives with along grip, associated with the equipment of warriors (Andrzejewska, Demkowicz2016), although most probably not used in battle. Among the Scandinavian forms one might indicate also range of pole weapon heads (Andrzejewska, Demkowicz 2015b, 119), as well as ashield-boss and grip from the grave XII at Grzmiąca (Marcinkian 1978, 98, fig. 14:g,h).One has to notice new possibilities which occurred in amoment when the picture of diversities in the military equipment of the cultures: Przeworsk, Sudovian, Bogaczewo, and Wielbark has been recognised (see the synthesis of the hoplological research: Kontny 2019a), as well as – reaching beyond the borders of Poland – northern European Barbaricum, and – partly – Elbe circle. It presents possibilities of creating comparative models of military equipment, indicating mutual influences and reconstructing their mechanisms. Already now it was possible to indicate the culture-forming position of the Przeworsk pattern of military equipment in the Early Roman Period and subphase C1a; in the later time asimilar role was played by the Scandinavian model, although this influence was not that standardizing (Kontny 2019c). It was also possible to identify Przeworsk-culture and Balt archaeological materials at the chosen sacrificial sites in Scandinavia (Kontny 2017c; 2019e), as well as Crimea (Kontny 2013c). It allowed to form ahypothesis on undertaking even far-going military expeditions by the warriors from the area of current Poland in the Roman Period, while participating in frequently ethnically heterogeneous war bands (Kontny 2003b; 2019d); it can clarify, to some extent, also some changes in cultural ranges. Fuller knowledge of the picture of military equipment diversity in Barbaricum (paying attention especially to the analysis of the shafted weapon heads, being agood indication of the cultural affiliation) will allow to continue similar comparisons and deepen the knowledge in the field of history of wars in Barbaricum, on the top of that, reconstructed without any precise data from the written sources. Northern European sacrificial sites showed huge potential which is presented by this kind of studies. Such direction is even more promising because the studies of lake and riverine deposits identified lately in the area of Poland should create new research perspectives, although they not necessarily have acharacter identical to – truly not homogeneous – Scandinavian sites. It seems that there is an abundance of the most exciting topics for along time!