Material of tesseraspids (Tesseraspidiformes) is reported from the uppermost Severnaya Zemlya Formation
(Lochkovian, Lower Devonian) of the Severnaya Zemlya archipelago, in the Russian Arctic, where it is associated
with other vertebrate remains, including corvaspids, acanthodians, and large but rare specimens of
osteostracans. The tesseraspid material is not abundant, and most often preserved as a “patchwork” of bony
platelets (tesserae), except for a few partly articulated specimens. We redescribe the holotype of Tesseraspis
mosaica Karatajūtė-Talimaa, 1983, whose head carapace is preserved as a flattened tube of adjacent tesserae.
This material is compared to the already published tesseraspid taxa, i.e., T. tessellata Wills, 1935, T. toombsi
Tarlo, 1964, T. mutabilis (Brotzen, 1934), T. oervigi Tarlo, 1964 emend. Dineley and Loeffler, 1976, T. denisoni
Tarlo, 1964, and T. talimaae Tarlo, 1965. All species are based upon rare and incomplete material, as no
head carapaces associated with trunk and tail are known, and so, the intraspecific variability is also unknown.
Distinction between “species” is based on the detail of the superficial sculpture of the tesserae of the head carapaces,
which is unsatisfactory. It is concluded that only four of the nominal species can be retained. A review
of all other known tessellated pteraspidomorphs indicates that our knowledge of tessellated heterostracans is
currently insufficient to support a meaningful classification.
In the recent years structural health monitoring (SHM) has gathered spectacular attention in civil engineering applications. Application of such composites enable to improve the safety and performance of structures. Recent advances in nanotechnology have led to development of new family of sensors – self-sensing materials. These materials enable to create the so-called “smart concrete” exhibiting self-sensing ability. Application of selfsensing materials in cement-based materials enables to detect their own state of strain or stress reflected as a change in their electrical properties. The variation of strain or stress is associated with the variation in material’s electrical characteristics, such as resistance or impedance. Therefore, it is possible to efficiently detect and localize crack formation and propagation in selected concrete element. This review is devoted to present contemporary developments in application of nanomaterials in self-sensing cement-based composites and future directions in the field of smart structures.
Nowadays, resonators are widely used in automobile, industrial applications, aerospace engineering, and some other fields. One of the unique characteristics of resonators which made them highly convenient is their acoustic capability to attenuate noise without having to use any acoustic absorptive material. The device acts by manipulating the sound waves to create mismatch impedance. Recent studies also suggest that the typical bulk size resonator with narrow frequency bandwidth is not the only option anymore, since there are newly designed resonators that are capable of having wide attenuation bandwidth and are smaller in size. Numerical and experimental measures were executed accordingly with the same purpose to obtain efficient noise attenuation results from varying resonators’ and mufflers’ configuration in terms of quantity, types, and geometry. The aim of this review is to summarize recent developments on resonator study and to try highlighting some noteworthy issues that need to be unraveled by future research. Helmholtz resonator, Quarter wave tube, Herschel-Quincke tube and helicoidal resonator are part of the numerous resonator studies that will be covered in this paper.
The aim of the paper is to show the scale of preparing habilitation reviews ending with untypical conclusions and the impact of such reviews on the outcome of habilitation proceedings in one discipline – sociology. The general analysis of the outcome of the review comes down to the final conclusion; the detailed analysis proposed by the author also takes into account the degree of strengthening or weakening of this conclusion. In particular, the weakening of a positive conclusion may indicate that the actual evaluation of the work is rather negative and differs from the nominal evaluation. The article begins with a theoretical introduction in which the author analyzes the legal aspects of reviewing the achievements to the habilitation degree, the imperfections of this process indicated in the literature, and briefly refers to American and Polish research in the field of pragmatics of RPT reviews, which provide tools to interpret the mechanism of formulating unobvious conclusions. A study conducted on a sample of 130 habilitation cases in sociology from 2012–2019 showed that the results of the pro-ceedings were rather consistent with the results of the reviews. Nevertheless, a set of “border proceedings” have been identified that have received reviews with a low degree of certainty (weakened) or some, but divergent, degree of certainty. In their case, the outcome of the proceedings was unpredictable, i.e. proceedings with the same review configuration ended in different ways.
The paper presents a review of current achievements in the Electrical Capacitance Tomography (ECT) in relation to its possible applications in the study of phenomena occurring in fluidised bed reactors. Reactors of that kind are being increasingly used in chemical engineering, energetics (fluidised bed boilers) or industrial dryers. However, not all phenomena in the fluidised bed have been thoroughly understood. This results in the need to explore and develop new research methods. Various aspects of ECT operation and data processing are described with their applicability in scientific research. The idea for investigation of temperature distribution in the fluidised bed, using multimodal tomography, is also introduced. Metrological requirements of process tomography such as sensitivity, resolution, and speed of data acquiring are noted.
The report encompasses the activity of the Committee on Ethics in Science in the year 2017.
Evaluation apprehension is the anxiety arising from a concern that one’s knowledge or expertise may be evaluated unfavorably by an audience. In this regard, the educational field comprising students’ discussions, lectures, presentations, and interactions is not an exception. Plethora of studies on student apprehension demonstrated that the construct is under the influence of different factors and can create various consequences. The aim of the present review is to complement and encapsulate previous research on student apprehension by providing an updated review on the concept in different disciplines. Data from 30 studies published in Elsevier, Springer, Taylor & Francis, and System were coded based on a coding scheme. The studies were broadly classified into four categories in the realm of education in terms of students’ disciplines; namely, Second/Foreign Language Learning (9 studies), Accounting and Finance (4 studies), Medicine, Nursing, and Pharmacy (6 studies), and miscellaneous disciplines (11 studies). The focus of this review pivoted around antecedents and consequences of student apprehension in each field. The analysis demonstrated the multidimensional nature of the construct caused by a host of variables and resulting in a multitude of ramifications. Based on these findings, some implications and strategies for mitigating student evaluation apprehension are presented.
Rye is an important crop widely cultivated in Europe, but one of the hardest to improve due to its allogamy and self-incompatibility. The market for rye-based products is constantly growing thanks to the popularity of organic farming, feed production and diverse industry applications. To address these demands, new highly productive hybrid rye varieties are needed. Currently, full potential of heterosis in rye breeding is hard to reach due to the limited success in in vitro cultures. This review summarizes the progress in rye in vitro cultures and proposes novel approaches to overcome recalcitrance in this species.
This article concerns constitutional problems related to the implementation of EU directives seen from both the legal and comparative perspectives. The directives are a source of law which share a number of characteristic features that significantly affect and determine the specificity of Member States’ constitutional review of the directives as well as the legal acts that implement them. The review of the constitutionality of EU directives is carried out in accordance with the provisions of national implementing acts. Member States’ constitutional courts adopt two basic positions in this respect. The first position (adopted by, inter alia, the French Constitutional Council and German Federal Constitutional Court) is based on the assumption of a partial “constitutional immunity” of the act implementing the directive, which results in only a partial control of the constitutionality of the implementing acts, i.e. the acts of national law implementing such directives. The second position, (adopted, explicitly or implicitly by, inter alia, the Austrian Federal Constitutional Court, Czech Constitutional Court, Polish Constitutional Court, Romanian Constitutional Court and Slovak Constitutional Court) concerns the admissibility of a full review of the implementing acts. This leads to the admissibility of an indirect review of the content of the directive if the Court examines the provision as identical in terms of content with an act of EU law. Another issue is related to the application of the EU directives as indirect yardsticks of review. The French Constitutional Council case-law on review of the proper implementation of EU directives represents the canon in this regard. Nonetheless, interesting case studies of further uses of EU directives as indirect yardsticks of review can be found in the case law of other constitutional courts, such as the Belgian Constitutional Court or Spanish Constitutional Court. The research presented in this paper is based on the comparative method. The scope of the analysis covers case law of the constitutional courts of both old and new Member States. It also includes a presentation of recent jurisprudential developments, focusing on the constitutional case-law regarding the Data Retention Directive and the Directive on Combating Terrorism.
Currently more and more research is being done on integrated weed management to reduce or avoid herbicide use. Some growers are already using isotherapic dilutions to control weeds in organic farming. Isotherapy is different from homeopathy because it uses diluted and potentized (succussed) solutions of alcoholic macerate of the very pest causing health troubles. We set up a germination experiment to test if isotherapic dilutions of leaf macerate of annual ryegrass affect the dynamics of its seed germination in Petri dishes. Our results were diverse, from no effect to 10% more growing degree days necessary to reach 50% germination. It is doubtful that so low an effect will contribute to integrated weed management unless the slightly delayed germination triggers secondary effects at other life stages. This is in accordance with the scientific literature on that topic: two-fifths of the reports showed no effect, two-fifths resulted in positive responses and one-fifth had diverse responses for the criteria tested.
The report encompasses the activity of the Committee on Ethics in Science in the year 2018.
The report encompasses the activity of the Committee on Ethics in Science in the year 2016.
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