102,260 research outputs found
Rigidity versus flexibility of the ligand upon the porosity degree of new metal-organic polymeric materials
No full textIn the context of the adsorption gas property, four metal-organic polymeric materials based on cobalt(II), palladium(II), nickel(II) and zinc(II) with the rigid 4,4'-bipyrazole (labeled as Co-bpz, Pd-bpz, Ni-bpz and Zn-bpz), and four polymeric materials based on cobalt(II) nitrate, cobalt(II) acetate, nickel(II) nitrate and copper(II) acetate with the flexible bis(1,2,4-triazolyl)methane (labeled as Co1-btm, Co2-btm, Ni-btm and Cu-btm) have been investigated toward N-2 adsorption at 77 K. Their porous nature is manifested by the following values of the Langmuir surface area: 1057 m(2)/g, 1035 m(2)/g, 962 m(2)/g and 866 m(2)/g for Co-bpz, Pd-bpz, Ni-bpz and Zn-bpz, respectively, whereas the values of the surface area for the btm-based materials are all null. These results show that the rigid 4,4'-bipyrazolyl ligand induces the formation of porous polymeric structures, whereas the flexible bis(1,2,4-triazolyl)methane ligand induces the formation of nonporous structures
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
Nickel(II) and copper(I,II)-based metal-organic frameworks incorporating an extended tris-pyrazolate linker
No full textSolvothermal reactions between the tritopic pyrazole-based ligand 1,3,5-tris((1H-pyrazol-4-yl)phenyl)benzene (H3BTPP) and nickel(ii) perchlorate or copper(ii) nitrate afforded two new metal-organic frameworks, Ni3(BTPP)2·solvent (Ni-BTPP) and CuI4CuII2(OH)2(BTPP)2·solvent (Cu-BTPP). Powder diffraction structure determination methods were employed to determine the crystal and molecular structure of the copper(i,ii) derivative: triangular [Cu3N6(μ3-OH)] nodes are connected to six nearby ones by the pyrazolate ligands, thus constructing flat two-dimensional layers that stack to form slit-like one-dimensional channels. Thermogravimetric analyses highlighted both the thermal stability and the permanent porosity of these two materials. Porosity was confirmed by N2 adsorption at 77 K, yielding Langmuir specific surface areas of 1923(3) m2 g-1 and 874(8) m2 g-1 for Ni-BTPP and Cu-BTPP, respectively. Additionally, Ni-BTPP adsorbed 1.73 mmol g-1 (7.6 wt%) of CO2 at the mild conditions of 298 K and 1 bar
The Right to Strike under the United States Constitution: Theory, Practice, and Possible Implications for Canada
No full textAnswering critics of the Canadian Supreme Court's judgment in B.C. Health, the author argues that the Court laid the foundation for a principled and durable doctrine protecting constitutional labour rights, one that goes directly to the heart of the matter — the inequality of workers’ power in the employment relation. In the author’s view, two paths could lead from B.C. Health to the recognition of Charter protec- tion for a right to strike: one that treats the right as an accessory to col- lective bargaining, and one that upholds the right directly on the basis of the Charter values of equality and participation. The author supports the latter approach, contending that constitutional rights should be defined in relation to fundamental values, in a way that is not contingent on time-bound or fact-sensitive assessments about the role of strikes within a particular collective bargaining regime. Although a Charter right to strike may involve the courts in difficult choices about when to defer to legislative policy decisions, and courts may lack the institutional capac- ity to deal effectively with labour law issues, the author points out that judges can look to ILO standards for expert guidance. Noting that the U.S. experience in this area might be of considerable use to Canadians, the author concludes by providing an overview of American case law concerning a constitutional right to strike.Peer reviewe
THE SPECIES CONCEPT, THEMATIC SUBJECT IN NATURAL SCIENCES – THE SCIENTIFIC APPROACHES OF EMIL G. RACOVITZA AND NICOLAE BOTNARIUC
No full textSpecies concepts represent one of the “hot” topics of the current evolutionary biology. The Romanian natural scientists EMIL G. RACOVITZA and NICOLAE BOTNARIUC defined animal species in different ways:
EMIL G. RACOVITZA supported a Genealogic species concept, expressed as “a colony of isolated consanguines”. The RACOVITZA’s concept considers species as homogenous
lineages of organisms which evolve during their history. Description of such entities requires the recognition of primitive and derived states of the morphologic traits. Hence EMIL G. RACOVITZA’s ideas preceded the principles of phylogenetic systematics of WILLY HENNIG and his followers. Geographic isolation is viewed by RACOVITZA as one of the main drivers of the speciation process.
NICOLAE BOTNARIUC developed an innovative Systems-species concept where quasiindependent organisms through their relationships within populations build a supraindividual system. The integrative properties of the population offer the necessary
traits allowing the identification of species. Evolution is the emergent property of species (represented by populations) within the context of ecosystems and within the interpopulation relationships of a biocoenosis (the next level of the organizational
hierarchy of the living matter). NICOLAE BOTNARIUC applied his concept to interbreeding and agamous populations. In this latter case the exchange of genetic information is realised through the self-reproducing individuals changing, under selection pressure, the clonal genetic structure of the population. The systems-species concept of BOTNARIUC applies to populations living within a wide spectrum of ecological conditions and existing during various time-frames; it offers a different perspective as compared to the narrow ecological species-concept of VAN VALEN.
Recent research offers additional confirmation of the views of the two Romanian biologists. It is argued that the species-concepts discussed should be used within a pluralistic cultural framework of the evolutionary systems biology. Finally, it is emphasized that the ideas of EMIL G. RACOVITZA and NICOLAE BOTNARIUC should represent stimulating arguments for new innovative research projects
G-Rank: Unsupervised Continuous Learn-to-Rank for Edge Devices in a P2P Network
No full textRanking algorithms in traditional search engines are powered by enormous training data sets that are meticulously engineered and curated by a centralized entity. Decentralized peer-to-peer (p2p) networks such as torrenting applications and Web3 protocols deliberately eschew centralized databases and computational architectures when designing services and features. As such, robust search-and-rank algorithms designed for such domains must be engineered specifically for decentralized networks, and must be lightweight enough to operate on consumer-grade personal devices such as a smartphone or laptop computer. We introduce G-Rank, an unsupervised ranking algorithm designed exclusively for decentralized networks. We demonstrate that accurate, relevant ranking results can be achieved in fully decentralized networks without any centralized data aggregation, feature engineering, or model training. Furthermore, we show that such results are obtainable with minimal data preprocessing and computational overhead, and can still return highly relevant results even when a user’s device is disconnected from the network. G-Rank is highly modular in design, is not limited to categorical data, and can be implemented in a variety of domains with minimal modification. The results herein show that unsupervised ranking models designed for decentralized p2p networks are not only viable, but worthy of further research.https://github.com/awrgold/G-RankComputer Scienc
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