1,477 research outputs found
Hydrogen storage properties of 2Mg–Fe mixtures processed by hot extrusion: Influence of the extrusion ratio
No full textHot extrusion processing was employed to produce 2Mg–Fe bulk mixtures for hydrogen storage. 2Mg–Fe powder mixtures were prepared by high-energy ball milling. These mixtures were cold pressed into cylindrical pre-forms, which were then processed by hot extrusion (at 300 °C) to produce bulks. In this work, we analyzed the influence of the extrusion ratio (3/1, 5/1 and 7/1) on the sorption properties of the bulks. The nanometric grain size remained unaltered after all hot extrusion conditions. More porous bulks were produced at an extrusion ratio of 3/1. In the first cycle of hydrogenation, the sample processed at 3/1 absorbed more hydrogen (4 wt% of H) than the precursor powders (3 wt% of H). The results showed that the desorption temperature of bulks were very similar to that of 2Mg–Fe powders, which is good considering the lower surface area of bulks, and that samples with Fe in excess presented lower desorption temperatures
Ashburn Anstalt v WJ Arnold & Co. Ltd [1989] Ch 1, Court of Appeal
No full textEssential Cases: Land Law provides a bridge between course textbooks and key case judgments. This case document summarizes the facts and decision in Ashburn Anstalt v WJ Arnold & Co. Ltd [1989] Ch 1, Court of Appeal. The document also includes supporting commentary from author Aruna Nair.</p
Microstructural characterization and hydrogenation study of extruded MgFe alloy RID A-2096-2009 RID E-7763-2010
No full text2Mg-Fe alloys processed by hot-extrusion: Influence of processing temperature and the presence of MgO and MgH(2) on hydrogenation sorption properties RID A-2096-2009 RID A-1749-2009 RID E-7763-2010
No full text2Mg-Fe alloy powder produced by high-energy ball milling was processed by hot extrusion at temperatures of 200 °C and 300 °C to produce bulk samples. The alloys were hydrogenated for 24 h under hydrogen pressures of 24 bar (to produce the Mg2FeH6 phase) and 15 bar (to produce a mixture of MgH2 + Mg2FeH6 phases), respectively. After the hydrogenation treatments, the complex hydride Mg 2FeH6 was identified in both conditions, while the MgH2 and MgO phases were observed only after extrusion at 200 °C. Desorption temperatures varied with the extrusion conditions; extrusion at 300 °C resulted in a desorption onset temperature about 68 °C lower than that of samples extruded at 200 °C, and about 200 °C lower than that of commercial MgH2. Extrusion at the lower temperature did not change the number of stored defects (point defects, dislocations, voids, stacking faults, vacancies and others) produced in the milling process and increased the preferential sites for hydride nucleation, increasing the hydrogen storage capacity. The presence of MgO produced the beneficial effect of grain boundary pinning, but delayed the onset temperature of desorption. The combined presence of MgH2 and Fe after hydrogenation at 15 bar seems to play a catalytic role that considerably hastened the Mg-H reactions and increased the desorption kinetics. However, the desorption kinetics in both conditions was still low
Treść i dynamika objawienia imienia Bożego w Księdze Wyjścia Część I: Analiza narracji Wj 3,16–24,18
No full textThe article addresses the significance of the formulas of the Divine Name: יְהוָה, אֶהְיֶה אֲשֶׁר אֶהְיֶה, and אֶהְיֶה (Exod 3:14–15). Referring to the narrative character of the Book of Exodus and assuming that the ambiguous formulas of the Divine Name in the initial part of the story are elements of a deliberate literary strategy, the author proposes interpreting these formulas using a narrative method. An analysis of two narrative sections of the Book of Exodus (3:16–18:27; 19:1–24:18) reveals that God, whose presence is initially depicted as concealed, is later portrayed, through the presentation of the Name formulas, as manifesting His presence through active intervention. The narrated events, in which YHWH acts on behalf of the Israelites against their enemies (Exod 3:16–18:27) and subsequently leads them to covenantal commitment (Exod 19:1–24:18), present God-YHWH as being. This notion clearly aligns with the declaration embedded in the Name formulas.Artykuł podejmuje zagadnienie znaczenia formuł imienia Bożego: יְהוָה, אֶהְיֶה אֲשֶׁר אֶהְיֶה oraz אֶהְיֶה (Wj 3,14-15). Odwołując się do narracyjnego charakteru Księgi Wyjścia oraz przyjmując założenie, że niejednoznaczne formuły imienia Bożego w początkowej części opowieści stanowią element przemyślanej strategii literackiej, autor proponuje tłumaczenie tych formuł za pomocą metody narratywnej. Przeprowadzona analiza dwóch fragmentów narracji Księgi Wyjścia (3,16–18,27; 19,1–24,18) pozwala zauważyć, iż Bóg, którego obecność na początkowym etapie opowieści zaprezentowana zostaje jako niejawna, wraz z przedstawieniem formuł imienia, ukazany zostaje jako manifestujący swoją obecność w aktywnym działaniu. Opowiedziane wydarzenia, w których JHWH jest podmiotem działającym na rzecz Izraelitów przeciw ich wrogom (Wj 3,16–18,27), a następnie doprowadzającym ich do zawarcia przymierza (Wj 19,1–24,18), ukazują Boga-JHWH jako będącego, co w czytelny sposób koresponduje z deklaracją zawartą w formułach imienia
Treść i dynamika objawienia imienia Bożego w księdze Wyjścia Część II: Analiza narracji Wj 25,1-40,38
No full textThe article constitutes a continuation of the study addressing the significance of the formulas of the Divine Name: יְהוָה, אֶהְיֶה אֲשֶׁר אֶהְיֶה, and אֶהְיֶה (Exod 3:14–15). The analysis focuses on the subsequent textual material of the Book of Exodus (Exod 25:1–40:38), where YHWH is primarily portrayed as manifesting His presence in the Tabernacle, which He commands to be built as His dwelling place. Applying the method of narrative analysis to the entirety of the narrative material, the author concludes that the primary communicative aim of the book is to present God as being. This concept is signaled in the formulas of the Divine Name and confirmed throughout the narrative representation of the events. The depiction of YHWH’s presence intensifies progressively as the narrative unfolds, with God transitioning from an unknown name and imperceptible presence to being known by the name YHWH and permanently present among the Israelites.Artykuł stanowi kontynuację studium podejmującego temat znaczenia formuł imienia Bożego: יְהוָה, אֶהְיֶה אֲשֶׁר אֶהְיֶה oraz אֶהְיֶה (Wj 3,14-15). Analizie poddana zostaje dalsza partia materiału tekstualnego Księgi Wyjścia (Wj 25,1–40,38), gdzie JHWH zaprezentowany jest przede wszystkim jako manifestujący swoją obecność w przybytku, który nakazuje zbudować na mieszkanie dla siebie. Stosując metodę analizy narratywnej do całości materiału narracyjnego, autor dochodzi do wniosku, że głównym celem komunikacyjnym księgi jest ukazanie Boga jako będącego, co jest sygnalizowane w formułach imienia Bożego i potwierdzone w całej narracyjnej reprezentacji wydarzeń. Prezentacja obecności JHWH staje się coraz bardziej intensywna wraz z postępem narracji, a Bóg przechodzi od nieznanego imienia i niedostrzegalnej obecności do bycia znanym w imieniu JHWH i trwale obecnym pośród Izraelitów
Depth Control for Blind Water Jet Drilling in Bone
No full textAbstract - When surgically drilling blind holes in bone using a Water Jet (WJ), control over the resulting depth is a challenging issue of paramount concern. This thesis was part of a project aimed at replacing the awl and mallet technique used in traditional microfracture procedures with an arthroscopic high-pressure WJ instrument is capable of accurately drilling 2–4 mm deep holes in subchondral bone. The focus of this paper was to develop, analyze and evaluate concepts for ensuring the depthwise accuracy of a microfracturing WJ. Research was performed on both WJ systems and the microfracture procedure, and a thorough problem analysis detailing all concerning requirements and parameters was set up. It was determined that due to the strong non-uniformity of human bone, both spatially and between subjects, a WJ capable of monitoring the depth and implementing a closed-loop control system was needed to ensure safe and accurate drilling. To measure the depth of the hole and allow for feedback control, a flexible Nickel Titanium probe concept was devised and tested. The concept featured a 3D printed nozzle with built-in WJ orifice and depth probe, which could be extended down the hole made by the WJ by an ex-vivo actuator featurimg load and displacement sensors. When the load sensor detected a sudden rise in extension resistance, bottom contact was assumed and the hole depth was calculated based on the displacement of the probe. A proof-of-concept experiment showed the viability of using a flexible probe to measure the depth. Additionally, the algorithm produced for calculating the depth was shown to be robust against the hysteresis and backlash exhibited by the setup. When probing holes with depths of 0, 1, 2, 3, 4 and 5 mm and bore diameters of 1, 1.5, and 2 mm drilled in solid PMMA, the prototype managed an error mean of 0.00 mm with a SD of 0.19 mm. To test the probe in holes shaped as expected during microfracture surgery, a virtual interference experiment was carried out using mCT scans of WJ-drilled bones and simulated probes of varying diameters. Seven scans were probed from 4 different angles each; the results suggested that a probe with a 0.2–0.3 mm diameter was optimal in terms of traversing the hole without blockages and without risking over-penetration. Moreover, this thesis produced recommendations on carrying the project further, towards a fully integrated system capable of drilling accurate blind holes in human bone, in a closed-loop depth-controlled manner.BMEBioMechanical EngineeringMechanical, Maritime and Materials Engineerin
Mojżesz wysłannik Jahwe (Wj 1,1–14,31)
No full textThe Exodus of the Israelites from Egypt was the most important event in the history of the Chosen People. The historical and theological context of the biblical events contained in Exodus 1:1–14:31 was described.The aim of the research became the analysis and interpretation of the theological message contained in the first part of the Exodus recounting the liberation of the Israelites from Egyptian slavery (Exodus 1:1–14:31).In the analysis and exegesis of biblical texts, the intertextual method was used, as well as the historical-critical method over the issue of Moses’ mission.As a result of the study, it can be concluded that: 1) the knowledge of the God of Israel and His intentions is the key theme of the first fifteen chapters of the Exodus. Yahweh is the main protagonist of the events described in the Book of Exodus. He is their author and perpetrator; 2) the theme of the first part of the Exodus is the conflict over whom Israel is to serve; 3) the historical sources do not reflect in their entirety the facts known from the biblical account, for the reason that the Bible is not a historical chronicle, but a record of God’s revelation. Its main task is to convey theological content.The conclusions to be drawn are: 1) the revelation that was to Moses also applies to the Israelites, as well as to the Egyptians. However, the times and the manner of revelation change. God’s words are addressed to everyone, including modern people.The study conducted does not exhaust the subject of Moses’ mission to Israel. It is not a complete characterization of Moses. At the same time, it is necessary to keep in mind the further impact of the message of the Exodus on subsequent generations of Israel, as well as on modern times. The study can become a contribution to further theological reflection on the message of the Exodus.Wyjście Izraelitów z Egiptu było najważniejszym wydarzeniem w historii narodu wybranego. Został opisany kontekst historyczno-teologiczny wydarzeń biblijnych zawartych w Wj 1,1–14,31.Celem badań stała się analiza i interpretacja przesłania teologicznego zawartego w pierwszej części Księgi Wyjścia opowiadającej o wyzwoleniu Izraelitów z niewoli egipskiej (Wj 1,1–14,31).Przy analizie i egzegezie tekstów biblijnych wykorzystano metodę intertekstualną, a także historyczno-krytyczną nad zagadnieniem misji Mojżesza.W wyniku przeprowadzonych badań można stwierdzić, że: 1) poznanie Boga Izraela i Jego zamiarów jest kluczowym tematem pierwszych piętnastu rozdziałów Księgi Wyjścia. Jahwe jest głównym bohaterem wydarzeń opisanych w Księdze Wyjścia. On jest ich sprawcą i autorem; 2) tematem pierwszej części Księgi Wyjścia jest konflikt o to, komu służyć ma Izrael; 3) źródła historyczne nie odzwierciedlają w całości faktów znanych z relacji biblijnej, dlatego że Biblia nie jest kroniką historyczną, lecz zapisem objawienia Bożego. Jej głównym zadaniem jest przekaz treści teologicznej.Wnioski, jakie należy wyciągnąć to: 1) objawienie, które było do Mojżesza, dotyczą także Izraelitów, jak i do Egipcjan. Zmieniają się jednak czasy i sposób objawienia. Słowa Boga skierowane są do wszystkich, również do ludzi współczesnych.Przeprowadzone badania nie wyczerpują tematu misji Mojżesza względem Izraela. Nie jest pełną charakterystyką Mojżesza. Należy przy tym pamiętać o dalszym oddziaływaniu przesłania Księgi Wyjścia na kolejne pokolenia Izraela, a także na czasy współczesne. Badanie mogą stać się przyczynkiem do dalszej refleksji teologicznej nad przesłaniem Księgi Wyjścia
Finite linear spaces admitting a projective group PSU(3,q) with q even
No full textAbstractThis article is a contribution to the study of the automorphism groups of finite linear spaces. In particular we look at simple groups and prove the following theorem:Let G=PSU(3,q) with q even and G acts line-transitively on a finite linear space S. Then S is one of the following cases:(i)A projective plane;(ii)A regular linear space with parameters (b,v,r,k)=(q2(q2−q+1),q3+1,q2−q+1,q+1). This is called the Hermitian unitary design
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