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The Holocene ◽  
2022 ◽  
pp. 095968362110665
Author(s):  
Kevin Kearney ◽  
Benjamin Gearey ◽  
Susan Hegarty ◽  
Suzi Richer ◽  
Carla Ferreira ◽  
...  

A multiproxy (pollen, microcharcoal, loss-on-ignition, magnetic susceptibility and geochemistry) sequence from Lough Cullin, southeast Ireland, supported by a high-resolution radiocarbon chronology, modelled using Bayesian approaches, provides a record of environmental change for much of the Holocene. Following the establishment of mixed deciduous woodland, climatic deterioration was likely responsible for pronounced vegetation change and erosion, 7615–6500 cal. BC to 6245–5575 cal. BC, evidence for the ‘8.2 Kyr’ BP climate event. The so-called ‘elm decline’ is dated to 4220–3980 cal. BC and whilst there are possible indications of an anthropogenic cause, clear evidence of woodland clearance with cereal pollen is recorded at 3900–3700 cal. BC, 3790–3580 cal. BC and 3760–3650 cal. BC, during a period of clearance and farming of 320–450 years duration. A reduction in farming/settlement and woodland regeneration during the Middle Neolithic parallels the archaeological record, with low levels of activity during the Late Neolithic/Chalcolithic after 2960–2525 cal. BC, prior to increases during the Bronze Age then woodland clearance and agriculture between 1500–1410 and 1275–1000 cal. BC, corresponding with the archaeological evidence. A subsequent ‘step-wise’ reduction in human activity follows, from the latter date to 815–685 cal. BC, and a brief but pronounced cessation at 690–535 cal. BC. Renewed woodland clearance and agriculture commenced until 415–250 cal. BC. From the latter date until cal. AD 390–540, the Late Iron Age/Early Medieval period, a phase of woodland recovery is attested, followed by renewed landscape disturbance and arable agriculture in particular, continuing to the close of the record at cal. AD 780–1035.


Author(s):  
Jan-Niclas Walther ◽  
Bahadir Kocacan ◽  
Christian Hesse ◽  
Alex Gindorf ◽  
Björn Nagel

AbstractPreliminary aircraft design and cabin design are essential and well-established steps within the product development cycle for modern passenger aircraft. In practice, the execution usually takes place sequentially, with the preliminary design defining a basic cabin layout and the detail implementation following in a subsequent step. To enable higher fidelity assessment of the cabin early in the design process—for example by means of virtual reality applications—this paper proposes an interface, which can derive detailed 3D geometry of the fuselage from preliminary design data provided in the Common Parametric Aircraft Configuration Schema (CPACS). This is a key step towards integration of cabin analysis and preliminary design in automated collaborative aircraft design chains, not only in terms of passenger comfort, but also manufacturability or crash safety. Like the TiGL Geometry Library for CPACS, the interface presented acts as a parameter engine, which translates data from CPACS into CAD geometry using the Open Cascade Technology library. However, the scope of TiGL is expanded significantly, albeit with an explicit focus on the fuselage, by including more details such as extruded frame and stringer profiles and floor structures. Furthermore, advanced knowledge management techniques are employed to detect and augment missing data. For virtual reality applications, triangulated representations of the CAD geometry can be provided in established exchange formats, creating an interface to common visualization platforms. Additionally, a new evolution of the cabin definition schema in CPACS is presented, to incorporate models of cabin components such as seats or sidewall panels enabling immersive virtual mock-ups.


2021 ◽  
Vol 11 (11) ◽  
pp. 736
Author(s):  
Sukadari Sukadari ◽  
Miftachul Huda

As the application of colored designs on cloth using wax in certain areas in decorating items of clothing, Batik is made through several steps that come from drawing the pattern on the paper followed by imitating the pattern on fabric, which is called ngeblat. The next phase is followed by drawing the pattern using wax, which is called mencanting. The subsequent step is the process of coloring the pattern of Batik, called pencoletan, and then subsequently followed by color-locking on Batik through covering the Batik with wax, namely basic color dyeing. This process is called menembok. The final step is making the panting process through washing, called nglorod. This process should attempt to maintain Batik with cultural sustainability, as its process contains several values, such as discipline, creativity, independence, patriotism, responsibility, cooperation, and environmental care. Based on this background, this paper attempts to examine the Batik’s cultural design and to explore its sustainability through co-curricular school program activities. This study focuses on examining the potential in the process of the application of colored design through elaborating the supporting and interfering factors in a co-curricular learning program of Batik. The analysis was made through several points, namely a co-curricular learning program of Batik for enhancing cultural sustainability, a co-curricular learning program of Batik for enhancing national culture and community responsibility, and co-curricular learning of Batik for sustainability and environmental accountability.


2021 ◽  
Author(s):  
Marianna Zaretsky ◽  
Ziqiang Guan ◽  
Raz Zarivach ◽  
Jerry Eichler

Haloferax volcanii AglD is currently the only archaeal dolichol phosphate (DolP)-mannose synthase shown to participate in N-glycosylation. However, the relation between AglD and Pyrococcus furiosus PF0058, the only archaeal DolP-mannose synthase for which structural information is presently available, was unclear. In this report, similarities between the PF0058 and AglD catalytic domains were revealed. At the same time, AglD includes a transmembrane domain far longer than that of PF0058 or other DolP-mannose synthases. To determine whether this extension affords AglD functions in addition to generating mannose-charged DolP, a series of Hfx. volcanii strains expressing truncated versions of AglD was generated. Mass spectrometry revealed that a version of AglD comprising the catalytic domain and only two of the six to nine predicted membrane-spanning domains could mediate mannose addition to DolP. However, in cells expressing this or other truncated versions of AglD, mannose was not transferred from the lipid to the protein-bound tetrasaccharide precursor of the N-linked pentasaccharide normally decorating Hfx. volcanii glycoproteins. These results thus point to AglD as contributing to additional aspects of Hfx. volcanii N-glycosylation beyond charging DolP with mannose. Accordingly, the possibility that AglD, possibly in coordination with AglR, translocates DolP-mannose across the plasma membrane is discussed. Layman summary In the archaea Haloferax volcanii , the dolichol phosphate (DolP)-mannose synthase AglD charges the lipid DolP with mannose, which is delivered to a protein-bound tetrasaccharide to generate the pentasaccharide decorating glycoproteins in this organism. Structural studies demonstrated the similarity of AglD to Pyrococcus furiosus PF0058, the only archaeal DolP-mannose synthase with a solved 3D structure. Truncated AglD containing the catalytic domain and only two of the predicted six to nine membrane-spanning regions catalyzed mannose-charging of DolP. Yet, no mannose was delivered to protein-linked tetrasaccharide in cells expressing AglD mutants including only up to five membrane-spanning regions, pointing to a role for the extended C-terminal region in a subsequent step of Hfx. volcanii N-glycosylation, such as DolP-mannose translocation across the plasma membrane.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Stephan Reichl ◽  
Eric Mädl ◽  
Felix Riedlberger ◽  
Martin Piesch ◽  
Gábor Balázs ◽  
...  

AbstractThe synthesis of phosphines is based on white phosphorus, which is usually converted to PCl3, to be afterwards substituted step by step in a non-atomic efficient manner. Herein, we describe an alternative efficient transition metal-mediated process to form asymmetrically substituted phosphines directly from white phosphorus (P4). Thereby, P4 is converted to [Cp*Fe(η5-P5)] (1) (Cp* = η5-C5(CH3)5) in which one of the phosphorus atoms is selectively functionalized to the 1,1-diorgano-substituted complex [Cp*Fe(η4-P5R′R″)] (3). In a subsequent step, the phosphine PR′R″R‴ (R′ ≠ R″ ≠ R‴ = alky, aryl) (4) is released by reacting it with a nucleophile R‴M (M = alkali metal) as racemates. The starting material 1 can be regenerated with P4 and can be reused in multiple reaction cycles without isolation of the intermediates, and only the phosphine is distilled off.


2021 ◽  
Vol 51 (2) ◽  
pp. 298-318
Author(s):  
Daniel Nagelstutz

Abstract During the Second World War, a few well-educated Greenlanders from the Danish colonies of Godthåb and Holsteinsborg expressed their sympathy for Nazi Germany. However, the background of the political turmoil within the Greenlandic elite remains largely unknown. This article presents the state of research and previously unknown sources on the Nazi riots in Greenland. In a subsequent step, potential motives for the movement will be discussed. So far, researchers have ruled out that Greenlanders were aware of the true nature of National Socialism. Instead, the scattered pro-German activities along Greenland’s West coast have been played down as spontaneous acts of provocation and mere political calculus. In fact, the Nazis’ ideology and war crimes were well known to the Greenlanders. In addition, German polar researchers made friends with Greenlandic journalists, teachers and catechists after the Nazi seizure of power. Last not least, the article will examine how Danish discrimination against Greenlanders contributed to the Greenlandic chauvinism displayed by a few members of the Inuit elite.


Webology ◽  
2021 ◽  
Vol 18 (Special Issue 04) ◽  
pp. 1436-1448
Author(s):  
Jumana Suhail ◽  
Dr. Khalida Sh. Rijab

The paper proposes a methodology for estimating packet flowing at the sensor level in SDN-WSN based on the partial congestion controller with Kalman filter. Furthermore, the actual purpose of proposing such methodology for predicting in advance the subsequent step of packet flow, and that will consequently contribute in reducing the congestion that might happen. The model proposed (SDN with Kalman filter) is optimized using congestion controller, the methodology of proposed work, the first step random distributed of random node, the apply the Kmean cluster of select the head cluster node in, the connected the network based on LEACH protocol. in this work proposed SDN with Kalman filter for control on network and reduce error of data, where achieve by add buffer memory for each nodes and head cluster to store the data, and SDN control on transmit ion data and receiver data, before transmit apply the Kalman filter on data to reduce error data. The proposed technique, according to simulation findings, extends the network's lifetime by over 30% more than typical WSNs, the reduce the average density of memory to 20% than traditional WSN, and the increase the average capacity of memory to 20% than traditional WSN.


2021 ◽  
Vol 27 (9) ◽  
pp. 64-77
Author(s):  
Anwar Dhyaa Majeed ◽  
Nadia Adnan Shiltagh Al-Jamali

The paper proposes a methodology for predicting packet flow at the data plane in smart SDN based on the intelligent controller of spike neural networks(SNN). This methodology is applied to predict the subsequent step of the packet flow, consequently reducing the overcrowding that might happen. The centralized controller acts as a reactive controller for managing the clustering head process in the Software Defined Network data layer in the proposed model. The simulation results show the capability of Spike Neural Network controller in SDN control layer to improve the (QoS) in the whole network in terms of minimizing the packet loss ratio and increased the buffer utilization ratio.


2021 ◽  
Vol 1 ◽  
pp. 2037-2046
Author(s):  
Anne Wallisch ◽  
Simon J. Nicklas ◽  
Kristin Paetzold

AbstractContrary to all agreement that methods can efficiently support design activities in the product development process, it can still be heard that notably complex methods often find little acceptance in industrial practice in terms of consistent use. Therefore, this concept paper aims to identify factors influencing the formation of acceptance to support a successful design and implementation of methods in product development. For this purpose, the first necessary step is to clarify the conceptualization of acceptance within this domain. Furthermore, the influencing variables, which are described in the acceptance models having been identified as development-relevant in a literature review, are first extracted and second newly structured using a behavioural model reflecting the mental stages from stimulus to behaviour. Third, the insights gained towards the factors' relevance throughout these stages are applied to the conditions of method application in engineering and design. In a subsequent step, basic assumptions towards central fields of action for concrete measures to increase acceptance concerning the use of methods in product development are derived.


2021 ◽  
Author(s):  
Lama Jabareen ◽  
Moorthy Maruthapandi ◽  
Arumugam Saravanan ◽  
Aharon Gedanken

Abstract The utilization of lignocellulosic biomass is effective to produce chemicals and fuels, which are of importance for the establishment of a sustainable society. The conversion of cellulose, which is the main component of the lignocellulosic biomass, into significant chemicals that can be further converted to different chemicals or fuels in the subsequent step, under gentle conditions is a promising route. Organic acids such as acetic acid, glycolic acid and formic acid are significant chemicals are examples of such products. A novel method to producing important platform chemicals from Micro-crystalline cellulose was developed. Micro-crystalline cellulose was degraded as a result of an oxidation with potassium chlorate by microwave radiation, in a one-pot procedure, efficient reaction conditions such as short reaction time and full conversion of the cellulose were identified. The reaction products have been analyzed by 1H, 13C NMR, XPS, TGA and XRD.


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