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  • Walter de Gruyter GmbH  (4)
  • 1
    Online Resource
    Online Resource
    Walter de Gruyter GmbH ; 2020
    In:  Praehistorische Zeitschrift Vol. 95, No. 1 ( 2020-05-26), p. 112-127
    In: Praehistorische Zeitschrift, Walter de Gruyter GmbH, Vol. 95, No. 1 ( 2020-05-26), p. 112-127
    Abstract: The oldest silver artefact from north of the Alps was found on the territory of Czech Republic is Stollhoff-type disc found in Kotouč hill near Štramberk. Similar silver disc was recently excavated at Vanovice (Czech Republic). This paper was complied to answer these particular questions: 1. what was the origin of earliest silver artefacts in Central Europe, 2. when these artefacts were emerged, and 3. what raw material was used and how it was processed. To answer these questions, typological analysis of vessels, thermoluminescence (TL) dating, compositional analysis (performed by ED-XRF) and scanning electron microscopy were employed. According to shape of ceramic vessels accompanying silver artefact, the Vanovice hoard can be dated to the Baalberge phase of the Funnel Beaker Culture during the later Eneolithic. Attempt to date pottery by TL method was not successful. The local origin of the pottery and the Carpathian/East-Balkan source of metal suggest that the Vanovice silver disc and the accompanying pottery were made in different periods, largely because precious metals endure longer than pottery.
    Type of Medium: Online Resource
    ISSN: 1613-0804 , 0079-4848
    RVK:
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2050013-0
    SSG: 6,11
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  • 2
    Online Resource
    Online Resource
    Walter de Gruyter GmbH ; 2016
    In:  Agricultural Engineering Vol. 20, No. 4 ( 2016-12-1), p. 157-166
    In: Agricultural Engineering, Walter de Gruyter GmbH, Vol. 20, No. 4 ( 2016-12-1), p. 157-166
    Abstract: Technology of processing of agricultural raw material and production residues from agri-food industry often requires their dewatering. Digestate is one of such materials i.e. the mass remaining after the bio-gasification process, which has great hydration (above 85%). The objective of the research was to know the impact of dewatering on the change of water content in digestate from biogas in Piekoszów. A mechanical dewatering process was carried out and reflected the conditions of operation of screw presses for dewatering of plant raw materials, whose screen internal diameter is 160 mm. Knowing the impact of pressure on the dynamics of raw material moisture decrease will allow modelling of the operation of industrial devices with similar operation parameters. Thus, a research on the dewatering process with the use of pressure within 0.58-2.91 MPa and slotted screens with meshes size of 0.1; 0.2 and 0.3 mm were carried out. The analysis of the obtained results indicates that an effective process of dewatering of the investigated digestate takes place at the working pressure to 1.74 MPa regardless the applied screen. Further increase of pressure does not cause a significant decrease of moisture in the investigated material.
    Type of Medium: Online Resource
    ISSN: 2449-5999
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2016
    detail.hit.zdb_id: 2864909-6
    detail.hit.zdb_id: 2862921-8
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  • 3
    In: Agricultural Engineering, Walter de Gruyter GmbH, Vol. 20, No. 4 ( 2016-12-1), p. 207-217
    Abstract: The paper presents the results of research, the objective of which was to determine the impact of particle size distribution and density of digestates and ash on density and tensile strength of granular fertilizer obtained from mixtures of these substrates. Particle size distribution, absolute density, envelope density and porosity of substrates were determined. Granular fertilizers were made of clean substrates and their mixtures. Envelope density of the obtained granulates was within 0.81 - 1.88 g⋅cm -3 . The determined compaction degree was within 3.65 - 10.12. While, the compaction index IS of granulates made of mixtures was within 0.5 - 0.55 and was lower in comparison to IS of granulates from digestates (0.6) and ash (0.76).
    Type of Medium: Online Resource
    ISSN: 2449-5999
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2016
    detail.hit.zdb_id: 2864909-6
    detail.hit.zdb_id: 2862921-8
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    Walter de Gruyter GmbH ; 2016
    In:  Archive of Mechanical Engineering Vol. 63, No. 1 ( 2016-03-1), p. 93-112
    In: Archive of Mechanical Engineering, Walter de Gruyter GmbH, Vol. 63, No. 1 ( 2016-03-1), p. 93-112
    Abstract: This paper compares selected optimization-based methods for the analysis of multibody systems with redundant constraints. The following numerical schemes are examined: direct integration method, Udwadia-Kalaba formulation, two types of least-squares block solution method and Udwadia-Phohomsiri formulation. In order to compare efficiency of the algorithms, a series of simulations is performed on two exemplary McPherson struts. In the first variant, the mechanism has no redundant constraints whereas the other is overconstrained. Three constraint stabilization schemes are also compared in terms of integration errors.
    Type of Medium: Online Resource
    ISSN: 2300-1895
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2016
    detail.hit.zdb_id: 2620641-9
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