This article discusses the view that bioethics should become ‘‘culturally sensitive’’ and give more weight to various cultural traditions and their respective moral beliefs. It is argued that this view is implausible for the following three reasons: it renders the disciplinary boundaries of bioethics too flexible and inconsistent with metaphysical commitments of Western biomedical sciences, it is normatively useless because it approaches cultural phenomena in a predominantly descriptive and selective way, and it tends to justify certain types of discrimination.

In this paper the Lorentz transformations and the standard transformations of the usual Maxwell equations with the three-dimensional vectors of the electric and magnetic fields, E and B, respectively, are examined using both the geometric algebra and tensor formalisms. Different 4D algebraic objects are used to represent the usual observer dependent and the new observer independent electric and magnetic fields. It is found that the ST of the ME differ from their LT and consequently that the ME with the 3D (...) E and B are not covariant upon the LT but upon the ST. The obtained results do not depend on the character of the 4D algebraic objects used to represent the electric and magnetic fields. The Lorentz invariant field equations are presented with 1-vectors E and B, bivectors EHv and BHv and the abstract tensors, the 4-vectors Ea and Ba. All these quantities are defined without reference frames, i.e., as absolute quantities. When some basis has been introduced, they are represented as coordinate-based geometric quantities comprising both components and a basis. It is explicitly shown that this geometric approach agrees with experiments, e.g., the Faraday disk, in all relatively moving inertial frames of reference, which is not the case with the usual approach with the 3D bf E and B and their ST. (shrink)

The objective of this article was to review existing research to assess the evidence for predictive processing in sign language, the conditions under which it occurs, and the effects of language mastery on the neural bases of PP. This review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses framework. We searched peer-reviewed electronic databases and gray literature. We also searched the reference lists of records selected for the review and forward citations to identify all relevant publications. We searched (...) for records based on five criteria. To reduce the risk of bias, the remaining two authors with expertise in sign language processing and a variety of research methods reviewed the results. Disagreements were resolved through extensive discussion. In the final review, 7 records were included, of which 5 were published articles and 2 were dissertations. The reviewed records provide evidence for PP in signing populations, although the underlying mechanism in the visual modality is not clear. The reviewed studies addressed the motor simulation proposals, neural basis of PP, as well as the development of PP. All studies used dynamic sign stimuli. Most of the studies focused on semantic prediction. The question of the mechanism for the interaction between one’s sign language competence and PP in the manual-visual modality remains unclear, primarily due to the scarcity of participants with varying degrees of language dominance. There is a paucity of evidence for PP in sign languages, especially for frequency-based, phonetic, and syntactic prediction. However, studies published to date indicate that Deaf native/native-like L1 signers predict linguistic information during sign language processing, suggesting that PP is an amodal property of language processing.Systematic Review Registration[https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42021238911], identifier [CRD42021238911]. (shrink)

In this paper it is exactly proved that the standard transformations of the three-dimensional (3D) vectors of the electric and magnetic fields E and B are not relativistically correct transformations. Thence the 3D vectors E and B are not well-defined quantities in the 4D space-time and, contrary to the general belief, the usual Maxwell equations with the 3D E and B are not in agreement with the special relativity. The 4-vectors E a and B a , as well-defined 4D quantities, (...) are introduced instead of ill-defined 3D E and B. The proof is given in the tensor and the Clifford algebra formalisms. (shrink)

An apparent paradox is obtained in all previous treatments of the Trouton–Noble experiment; there is a three-dimensional (3D) torque T in an inertial frame S in which a thin parallel-plate capacitor is moving, but there is no 3D torque T′ in S′, the rest frame of the capacitor. Different explanations are offered for the existence of another 3D torque, which is equal in magnitude but of opposite direction giving that the total 3D torque is zero. In this paper, it is (...) considered that 4D geometric quantities and not the usual 3D quantities are well-defined both theoretically and experimentally in the 4D spacetime. In analogy with the decomposition of the electromagnetic field F (bivector) into two 1-vectors E and B we introduce decomposition of the 4D torque N (bivector) into 1-vectors N s , N t . It is shown that in the frame of “fiducial” observers, in which the observers who measure N s and N t are at rest, and in the standard basis, only the spatial components $N_{s}^{i}$ and $N_{t}^{i}$ remain, which can be associated with components of two 3D torques T and T t . In such treatment with 4D geometric quantities the mentioned paradox does not appear. The presented explanation is in complete agreement with the principle of relativity and with the Trouton–Noble experiment without the introduction of any additional torque. (shrink)

Different approaches to special relativity (SR) are discussed. The first approach is an invariant approach, which we call the “true transformations (TT) relativity.” In this approach a physical quantity in the four-dimensional spacetime is mathematically represented either by a true tensor (when no basis has been introduced) or equivalently by a coordinate-based geometric quantity comprising both components and a basis (when some basis has been introduced). This invariant approach is compared with the usual covariant approach, which mainly deals with the (...) basis components of tensors in a specific, i.e., Einstein's coordinatization of the chosen inertial frame of reference. The third approach is the usual noncovariant approach to SR in which some quantities are not tensor quantities, but rather quantities from “3+1” space and time, e.g., the synchronously determined spatial length. This formulation is called the “apparent transformations (AT) relativity.” It is shown that the principal difference between these approaches arises from the difference in the concept of sameness of a physical quantity for different observers. This difference is investigated considering the spacetime length in the “TT relativity” and spatial and temporal distances in the “AT relativity.” It is also found that the usual transformations of the three-vectors (3-vectors) of the electric and magnetic fields E and B are the AT. Furthermore it is proved that the Maxwell equations with the electromagnetic field tensor Fab and the usual Maxwell equations with E and B are not equivalent, and that the Maxwell equations with E and B do not remain unchanged in form when the Lorentz transformations of the ordinary derivative operators and the AT of E and B are used. The Maxwell equations with Fab are written in terms of the 4-vectors of the electric Ea and magnetic Ba fields. The covariant Majorana electromagnetic field 4-vector Ψa is constructed by means of 4-vectors Ea and Ba and the covariant Majorana formulation of electrodynamics is presented. A Dirac like relativistic wave equation for the free photon is obtained. (shrink)

In contemporary debates about the nature of bioethics there is a widespread view that bioethical decision making should involve certain knowledge of and respect for cultural diversity of persons to be affected. The aim of this article is to show that this view is untenable and misleading. It is argued that introducing the idea of respect for cultural diversity into bioethics encounters a series of conceptual and empirical constraints. While acknowledging that cultural diversity is something that decision makers in bioethical (...) contexts should try to understand and, when possible, respect, it is argued that this cultural turn ignores the typically normative role of bioethics and thus threatens to undermine its very foundations. (shrink)

This review presents first ever literature survey on historical development of farm animal welfare indicators and assessment in the Danube region. This area, encompassing European Eastern countries and the Balkans, is to a large extent heterogeneous in terms of culture and language. However, international publications were disproportionally small compared to the amount of research institutions and animal welfare activities present in the region. Therefore, the authors aimed at investigating the published literature, focusing on country level and on native languages. Data (...) were collected for the 1980–2015 period referring to scientific papers published in international and national journals, papers and abstracts in proceedings of the international and national conferences, reviews, monographs, short communications, Ph.D., Master and Graduation theses. Welfare assessment of all farm animal species was observed including fish. Over 180 papers were in line with the preselected index. Data collected showed that publishing dynamics grew rapidly towards the last decade. Most of the studies were focused on animal welfare indicators such as stress, injuries and mutilations, behaviour, body condition and management practices. Cattle, chickens, pigs and sheep were the predominant species investigated. The study revealed that experts from the region were greatly involved in the studies of animal welfare indicators and assessment, contributing to development of the currently most widely used animal welfare assessment protocols, thus having an important role in animal welfare research and protection. (shrink)

In this paper we present definitions of different four-dimensional (4D) geometric quantities (Clifford multivectors). New decompositions of the torque N and the angular momentum M (bivectors) into 1-vectors Ns, Nt and Ms, Mt, respectively, are given. The torques Ns, Nt (the angular momentums Ms, Mt), taken together, contain the same physical information as the bivector N (the bivector M). The usual approaches that deal with the 3D quantities $\varvec{E,\,B,\,F,\,L,\,N}$ etc. and their transformations are objected from the viewpoint of the invariant (...) special relativity (ISR). In the ISR, it is considered that 4D geometric quantities are well-defined both theoretically and experimentally in the 4D spacetime. This is not the case with the usual 3D quantities. It is shown that there is no apparent electrodynamic paradox with the torque, and that the principle of relativity is naturally satisfied, when the 4D geometric quantities are used instead of the 3D quantities. (shrink)

BOOK REVIEW: Davor Pećnjak, Tomislav Janović PREMA DUALIZMU. OGLEDI IZ FILOZOFIJE UMA (Towards Dualism: Essays in Philosophy of Mind) Ibis grafika: Zagreb, 2016.

The present article is a critical assessment of the “Connection Principle” – the principle according to which the two key properties of mental states, intentionality and phenomenality, are necessarily co-instantiated. A theory of mind endorsing some version of this principle assumes that all intentional states are either conscious or otherwise potentially conscious. The Connection Principle, being a subject of much controversy in the past 15 years, has divided the community of philosophers of mind in two, as it were, irreconcilable camps. (...) What poses a special challenge to both friends and foes of the Connection Principle – albeit for different reasons – is a plausible explanation of intentional character of unconscious mental states. We want to point to and comment on certain weaknesses of Searle’s attempt to solve this problem – an attempt drawing on the idea that unconsciousmental states “retain” its “aspectual shape” while unconscious. Eventually, we will venture to show why the notion of aspectual shape cannot play the explanatory role assigned to it by Searle, and why a more restrictive and a more consistent criterion for ascribing intentionality to unconscious states is needed. This new criterion should be sensible to our folk-psychological intuition suggesting that there are dispositional states that play an indispensable causal role in our mental economy and, as such, build a genuine subset of all nconscious, i.e., purely neurophysiological states of our mind/brain. (shrink)

The present article is a critical assessment of the “Connection Principle” – the principle according to which the two key properties of mental states, intentionality and phenomenality , are necessarily co-instantiated. A theory of mind endorsing some version of this principle assumes that all intentional states are either conscious or otherwise potentially conscious. The Connection Principle, being a subject of much controversy in the past 15 years, has divided the community of philosophers of mind in two, as it were, irreconcilable (...) camps. What poses a special challenge to both friends and foes of the Connection Principle – albeit for different reasons – is a plausible explanation of intentional character of unconscious mental states. We want to point to and comment on certain weaknesses of Searle’s attempt to solve this problem – an attempt drawing on the idea that unconsciousmental states “retain” its “aspectual shape” while unconscious. Eventually, we will venture to show why the notion of aspectual shape cannot play the explanatory role assigned to it by Searle, and why a more restrictive and a more consistent criterion for ascribing intentionality to unconscious states is needed. This new criterion should be sensible to our folk-psychological intuition suggesting that there are dispositional states that play an indispensable causal role inour mental economy and, as such, build a genuine subset of all nconscious, i.e., purely neurophysiological states of our mind/brain.U tekstu se želimo kritički osvrnuti na Searleovo “načelovezanosti” – načelo prema kojemu su svojstvo intencionalnosti i svojstvo fenomenalnosti nužno koinstancirana. Svaka teorija uma koja uključuje neku varijantu tog načela polazi od pretpostavke da su sva intencionalna stanja ili svjesna ili potencijalno svjesna. Riječ je o stajalištu koje je polariziralo filozofe uma i u posljednjih petnaestak godina bilo predmetom zanimljivih rasprava. Moglo bi se reći da se prema stavu – bilo eksplicitnom bilo implicitnom – koji neki filozof uma zauzima prema načelu vezanosti može prepoznati opći istraživački program kojemu pripada. I za zagovornike i za protivnike načela vezanosti – doduše iz različitih razloga – osobiti izazov predstavlja objašnjenje intencionalnosti nesvjesnih mentalnih stanja. Cilj nam je ukazati na neke nedostatke Searleova pokušaja da riješi taj problem – pokušaja kojemu u osnovi leži zamisao da nesvjesna mentalna stanja zadržavaju svoju aspektualnost dok su nesvjesna. Konkretno, pokazat ćemo zašto pojam aspektualnosti ne može igrati eksplanatornu ulogu koju mu je Searle namijenio te zašto bi trebalo pronaći neki drugi, restriktivniji i konzistentniji kriterij pripisivanja intencionalnosti potencijalno svjesnim stanjima. Taj bi kriterij, prema našem shvaćanju, trebao biti kompatibilan s pučkopsihološkom intuicijom o postojanju dispozicijskih stanja koja igraju neizostavnu kauzalnu ulogu u našemmentalnom funkcioniranju i koja, kao takva, čine autentičan podskup svih nesvjesnih stanja našeg mozga/uma. (shrink)

Sex reassignment surgery is a therapy for gender dysphoria standardly provided only upon a psychiatric authorization. Transgender scholars criticize this practice as unjustified medicalization and stigmatization of transsexual people. By demanding that sex reassignment surgery is not classified as therapy, they imply it should be classified as some kind of a biomedical enhancement. It is argued in this article that this reclassification is empirically and morally implausible because sex reassignment surgery is incompatible with two major views of enhancement. It is (...) incompatible with the nontherapeutic view because it does not improve or augment, above average, any physical or mental trait or function. It is incompatible with the welfarist view because this view, contrary to the transgender scholars’s demands, is compelled to retain the standard practice of providing sex reassignment surgery in order to ensure the optimal balance between its availability, beneficence, and possible harmfulness. (shrink)

Integrative bioethics is a brand of bioethics conceived and propagated by a group of Croatian philosophers and other scholars. This article discusses and shows that the approach encounters several serious difficulties. In criticizing certain standard views on bioethics and in presenting their own, the advocates of integrative bioethics fall into various conceptual confusions and inconsistencies. Although presented as a project that promises to deal with moral dilemmas created by modern science and technology, integrative bioethics does not contain the slightest normativity (...) or action-guiding capacity. Portrayed as a scientific and interdisciplinary enterprise, integrative bioethics displays a large number of pseudoscientific features that throw into doubt its overall credibility. (shrink)

In diesem Essay werde ich versuchen, zwei miteinander verknüpfte Fragen zu beantworten. Nimmt man Nietzsches Prinzip der Lebenssteigerung als Grundwert an, würde Wahrheit und die Wahrheit zu sagen einen hohen, mittleren oder keinen Stellenwert haben? In welchem Sinne meint Nietzsche, dass „die Falschheit eines Urteils noch kein Einwand gegen ein Urteil“ ist? Um eine ausreichende Antwort auf diese beiden Fragen zu geben, werde ich darstellen, wie sich auf der Grundlage der Analyse und Kritik der herkömmlichen philosophischen Wahrheitstheorie in seinem Essay (...) unter dem Titel „Über Wahrheit und Lüge im außermoralischen Sinne“ in der Aphorismensammlung Jenseits von Gut und Böse eine vollwertige Theorie des Multiperspektivismus entwickelt. Nachdem Nietzsches Untersuchung des herkömmlichen philosophischen Wahrheitsbegriffs rekonstruiert worden ist, werde ich imstande sein, eine kasuistische Antwort auf die oben erwähnten Fragen zu geben. (shrink)

Dieser Essay versucht nicht nur die Vieldeutigkeiten zu entwirren, die sich um die phänomenologischen Begriffe ,Lebenswelt’ und ,Apriori der Lebenswelt’ ranken, sondern auch eine Phänomenologie der Lebenswelt in Beziehung zu vorwissenschaftlichem Alltagsleben und sinnlicher Wahrnehmung, den mathematischen und geometrischen Naturwissenschaften sowie der eidetischen und phänomenologischen Reduktion der reinen Phänomenologie und phänomenologischen Philosophie zu umreißen.

. Bildung and the historical and genealogical critique of contemporary culture: Wilhelm von Humboldt’s neo-humanistic theory of Bildung and Nietzsche’s critique of neo-humanistic ideas in classical philology and education. Educational Philosophy and Theory: Vol. 50, Bildung and paideia. Philosophical models of education, pp. 662-671.

This essay attempts to clarify the ambiguities attached to the term ‘the life-world’ and ‘a priori of the life-world’ in the phenomenological sense. It sketches the phenomenology of the life-world with respect to everyday pre-scientific life and perception, the mathematical and geometrical sciences of the natural world, and the eidetic and phenomenological reductions of pure phenomenology and phenomenological philosophy.

In this essay, I will try to answer two related questions. Adopting Nietzsche’s principle of the “enhancement of life” as a kind of basic value, would truth and truth-telling have high, medial, or no significance at all? In what sense does Nietzsche think that “the falsehood of a judgment is […] not necessarily an objection to it”?1 In order to give a satisfactory answer to these two questions, I will first illustrate how, from his essay entitled “On Truth and Lies (...) in an Non Moral Sense” to the collection of aphorisms entitled Beyond Good and Evil, Nietzsche develops his analysis and critique of the conventional philosophical theory of truth into a full-fledged theory of multiperspectivism. Having reconstructed Nietzsche’s inquiry of the conventional concept of truth and his theory of perspectivism, I will be able to give a casuistic answer to the two abovementioned questions. (shrink)

Autonomous vehicles (AVs) are expected to improve road traffic safety and save human lives. It is also expected that some AVs will encounter so-called dilemmatic situations, like choosing between saving two passengers by sacrificing one pedestrian or choosing between saving three pedestrians by sacrificing one passenger. These expectations fuel the extensive debate over the ethics settings of AVs: the way AVs should be programmed to act in dilemmatic situations and who should decide about the nature of this programming in the (...) first place. In the article, the ethics settings problem is analyzed as a trilemma between AVs with personal ethics setting (PES), AVs with mandatory ethics setting (MES) and AVs with no ethics settings (NES). It is argued that both PES and MES, by being programmed to choose one human life over the other, are bound to cause serious moral damage resulting from the violation of several principles central to deontology and utilitarianism. NES is defended as the only plausible solution to this trilemma, that is, as the solution that sufficiently minimizes the number of traffic fatalities without causing any comparable moral damage. (shrink)

Dans cette dissertation, nous tenterons de répondre à deux questions liées. Premièrement, si nous acceptons le principe de Nietzsche sur « l’agrandissement de la vie » comme valeur principale, la vérité et l’expression de la vérité auraient-elles une signification grande, moyenne ou nulle? Dans quel sens Nietzsche soutient-il que la « fausseté d’une estimation n’est pas nécessairement son reproche »? Dans le but de donner une réponse satisfaisante à ces deux questions, il faut d’abord montrer comment Nietzsche, à partir de (...) l’analyse et de la critique d’une théorie habituelle de la vérité , construit sa propre théorie du multiperspectivisme. Dans l’essai intitulé « Vérité et mensonge dans un sens extramoral », nous trouvons le germe de cette théorie que Nietzsche a encore développé dans le recueil d’aphorismes intitulé Par-delà le bien et le mal. Après que nous aurons reconstruit les recherches de Nietzsche sur la théorie habituelle de la vérité et sur sa propre théorie du multiperspectivisme, nous pourrons donner une réponse casuistique aux deux questions citées ci-avant. (shrink)

Ovaj članak pokušava ne samo pojasniti višeznačnosti vezane uz fenomenološke pojmove ‘životni svijet’ i ‘a priori svijeta života’ , nego isto ocrtati fenomenologiju svijeta života u odnosu prema predznanstvenom životu i svakdanje percepcije, matematičkim i geometrijskim prirodoslovnim znanostima te eidetičkoj i fenomenološkoj redukciji čiste fenomenologije i fenomenološke filozofije.

Članak je usmjeren ususret paradigmi nove fizike koju treba iznijeti LHC, ali s kritičkim prosuđivanjem toga razvoja pomoću Kuhnovih teza i epistemologije povezanih s modernom fizikom. Promišljanja i prosudbe nove filozofije niču iz LHC-fizike, koja se tumači kao »science universelle« . LHC, kao najveći sudarivač čestica u svijetu do sada, nije motiviran time da uništi Boga niti bilo koju vjeru u svijetu, već za otkrivanje novih čestica s njihovim interakcijama i kozmologijom u Prirodi, baš onoliko koliko pružaju LHC-scenariji na Tera-elektron-volt (...) skali. Polazeći od ponovnog otkrića fizike Standardnog modela i otkrića Higgsovih bozona, nova fizika na LHC-u ide mogućim putovima u skladu s problemom hijerarhije u suvremenoj fizici. K tome još, SM nije konačna teorija i upućuje se prema ne-standardnoj fizici poput supersimetrije , dodanih dimenzija na TeV-skali s kozmološkim posljedicama te ostale scenarije. Ne-standardna fizika, teorija i pokus, predviđa se otvorenom pa je formuliran novi princip agnostičkog eksperimentalizma kao najprikladniji filozofski princip, jer se ne mogu sva opažanja znati/predvidjeti na LHC-u. Čak i ako eksperimentalni program LHC-a krene u krivome smjeru, mnoge će mogućnosti izroniti iz Pandorine kutije fizike. Tada će filozofska promišljanja postati vrlo važna, napose Kuhnovi pogledi kao i naš AE princip te noviji mediteranski razvoj filozofije. Uostalom, standardna paradigma kao i nova fizika na LHC-u ne opisuju svijet u kojemu danas živimo.A paper is aiming towards a new physics paradigm to be brought by the LHC with a critical assessing on that development by the Kuhnian theses and epistemology related to modern physics. Thinking and critical assessments on the new philosophy arise up from the LHC physics, which is interpreted as the ‘science universelle’ . The LHC as the world’s largest particle collider as ever been was not motivated neither to destroy God nor any religion in the World, but to investigate new particles with their interactions and cosmology of the Nature inasmuch as it has proposed by the LHC scenarios on the Tera-electron-Volt scale. Starting from the rediscovery of the Standard Model and discovery of the Higgs bosons, the new physics at the LHC goes by the possible roads according to the Hierarchy Problem in contemporary physics. However, the SM is not a final theory by inquiring a Non-Standard physics, such as Supersymmetry , Extra Dimensions on the TeV scale with cosmological implications, and other scenarios. A Non-Standard physics, both theory and experiment, is foreseen to be open and a novel view of agnostic experimentalism was formulated to be the best philosophical principle, since we can’t know/predict everything to be observed in the LHC. Even if experimental programme of the LHC wouldn’t go in the right way, then many possibilities may emerge from the Pandora’s Box of physics. Then, philosophical considerations would become very important, particularly Kuhn’s views on it including our AE principle and new Mediterranean development of philosophy, respectively. After all, either standard paradigm or the new physics of the LHC doesn’t describe the world in which we live. (shrink)

This paper brings, for the first time, an interesting modern description of the Patricius’ phenomenological theory of tides and its modern relativistic understanding. Famous historians of science are emphasizing Patricius’ treatise on tides, which had been of primary importance for Kepler in his attempts at formulating the universal character of attraction. Patricius had tried to explain the variety of phenomena of tides in various seas as part of his model of the universe . He correctly recognized the Moon and the (...) Sun as two general causes of tides , but failed to see the role of gravity. Patricius rather ascribed tides, within the framework of his general philosophy, to be caused by light and heat . Science after Patricius explained tides as an effect of gravity , and later in the 20th century as an effect of spacetime curvature . The mathematical description of tides within Newton’s theory of gravitation was shown in the paper, along with a more refined calculation of the same phenomenon in curved spacetime within the general relativity theory for the case of weak gravitational fields . The general relativistic correction found to be very small compared to the classical Newtonian expression, as one should expect when dealing with weak gravitational fields. Both theories – Newton’s and Einstein’s – despite their precision and beauty in describing tides, do not, however, describe tides in such detail as Patricius’ theory which includes the local features of the phenomenon. At various symposia all over the world dedicated to his miraculous year of 1905 , Einstein has been recognized as the greatest physicists of the 20th century, and with Newton the two greatest physicists of all times. In the paper Patricius is understood as a direct predecessor of Kepler in the theory of tides, a hundred years before Newton. (shrink)

Hugh LaFollette has proposed that in order to prevent statistically expected harm that many parents inflict on their children prospective parents should be licensed. This article evaluates his proposal by looking at various facts, statistical data and probability estimates related to sex differences in human mating and parenting behaviour provided by evolutionary psychology. It is suggested that these evolutionary considerations create a serious stalemate between certain basic moral principles to which LaFollette subscribes, thus rendering the entire proposal morally impracticable. It (...) is also argued along similar lines that parental licensing would endanger some of the most personal and intimate human relationships that, in LaFollette’s view, are essential for developing one’s capacity for impartial morality. (shrink)

The aim of our research is to use abandoned deep-hydrocarbon reservoirs and dry wells in the Croatian part of the Pannonian Basin as a geothermal energy source. Croatia has been exploring and exploiting hydrocarbon reserves in the Pannonian Basin from the mid-20th century. Therefore, many oil and gas wells are reaching the end of their production phase and many are already abandoned. These wells could be considered for geothermal energy production through the coaxial heat exchanger principle, which is usually used (...) in shallow geothermal energy extraction. Using the abandoned deep well Pčelić located in the Drava subbasin as a case study, we have derived the available energy and fluid temperature changes during 20 years of operation for two cases: one with a constant base heat load throughout the year and the second as a variable heat load depending on outside air temperatures. We determined that the maximum potential heat extraction in a variable system is 1750 MWh per year, with 1.5 MW of peak heating power in winter, depending on the sink temperature, climate, and consumer input data. The maximum theoretical constant heat extraction for possible industrial direct heating could be 400 kW during the entire period of 20 years, with fluid temperature reaching steady state at a favorable 50°C. To define steady-state ratio between extracted heat and consumed energy at the circulating pump, we evaluated seasonal performance factor analysis similar to heat pump systems. Lower values of SPF linked to a higher flow rate implies higher energy extraction. Our results show that when using a lower flow, steady-state SPF ratio is as high as 280, and for a higher flow, steady-state SPF ratio drops to only 25. (shrink)

Weltbekannte Wissenschaftshistoriker loben Petrićs Abhandlung über Ebbe und Flut, die Keppler bei seinem Formulierungsansatz des universalen Charakters der Gravitation als Grundlage diente. Die Unterschiede zwischen Ebbe und Flut in verschiedenen Meeren suchte Petrić im Rahmen seines Modells des Universums zu erklären . Er folgerte schlüssig, dass der Mond und die Sonne zwei allgemeine Ursachen von Ebbe und Flut sind , ohne dabei die Rolle der Gravitation zu erkennen. Vielmehr erklärte Petrić Ebbe und Flut in seinem eigenen philosophischen System als eine (...) Folge von Sonnen- und Wärmeeinwirkungen . Die Wissenschaft hat nach Petrić Ebbe und Flut als eine Auswirkung der Gravitation erklärt, bzw. als Folge der Raumzeitkrümmung . In dem Artikel soll die mathematische Beschreibung von Ebbe und Flut im Rahmen von Newtons Gravitationstheorie erklärt werden, aber auch die perfektere Ausrechnung derselben Erscheinung innerhalb der Raumzeitkrümmung gemäß der allgemeinen Relativitätstheorie im schwachen Gravitationsfeld . Die relativistische Korrektion für Ebbe und Flut fällt im Hinblick auf den klassischen Newton’schen Ausdruck geringfügig aus, wie es auch für schwache Gravitationsfelder zu erwarten ist. Weder Newtons noch Einsteins Theorie – so perfekt sie in der mathematischen Beschreibung von Ebbe und Flut auch sein mögen – beschreiben Ebbe und Flut so eingehend, wie es Petrić in seiner phänomenologischen Theorie getan hat, indem er den lokalen Charakter des Phänomens hervorhob. Auf vielen Symposien anlässlich des 100. Jubiläums des wundervollen Jahres 1905 wurde Einstein zum größten Physiker des 20. Jahrhunderts erklärt, neben Newton zum größten Physiker aller Zeiten. Umso mehr sollen Petrićs Verdienste gewürdigt werden, nicht nur in Bezug auf seine Theorie des mathematischen und physikalischen Raumes, sondern auch hinsichtlich seiner phänomenologischen Theorie von Ebbe und Flut, die Petrić, als ein unmittelbarer Vorgänger Kepplers und ganze 100 Jahre vor Newton, in sein interessantes philosophisches System der Beschreibung des Universums und der darin stattfindenden Naturerscheinungen eingebaut hat. (shrink)