Replication of Archive Data: Experiences with the TerraSAR-X Mission

The German Remote Sensing Data Center (DFD) has developed a digital library for the long-term management of earth observation data products. This Product Library is a central part of DFD’s multi-mission ground segment Data Information and Management System (DIMS) and has been successfully in operation since 2000 at the DFD sites in Oberpfaffenhofen (near Munich) and Neustrelitz (north of Berlin). Since the launch of the new German earth observation satellite mission TerraSAR-X, the Product Library is responsible for the storage of all mission data at both sites, Neustrelitz being the main receiving and processing facility, and Oberpfaffenhofen being the complete mission long-term archiving site providing the user services. According to mission-specific policies, TerraSAR-X products are automatically replicated from one archiving site to the other. This paper presents the purpose and requirements for distributed archiving sites, the distributed archive functions provided by the DIMS Product Library and the experiences made for implementing and operating data replication for the TerraSAR-X mission

Product Library Architecture

This document presents the design of the Product Library (PL) of the Data and Information Management System (DIMS). The Product Library is responsible for the management and long-term preservation of digital earth observation products. It encapsulates all details of storing product data and offers standard client functionality to search, insert, update and delete products as well as advanced features for storage administration such as relocating products within the archive and related preservation management tasks

Object Query Language - Enabling Service for Earth Observation Product Processing, Access and Dissemination

Multi-mission product management systems have an uncontested primary focus on long term data preservation. However, sophisticated archive systems are incomplete if they provide only monosyllabic product identification and retrieval functions. The increasing diversity and amount of products, and an increasing complexity of applications require flexible and efficient query capabilities supporting spatio-temporal conditions, combination of related products and specific product metadata conditions and aggregations. This paper presents the Object Query Language (OQL) provided by the Product Library of the Data Information and Management System DIMS, the multi-mission ground segment infrastructure implemented and operated at DLR DFD. This comprehensive query language is the basis for an integrated inventory service supporting dynamic object-oriented metadata configuration, ad-hoc queries, event triggering, incremental query of huge result sets and full metadata inspection. OQL supports complex query conditions including object reference navigation and different spatio-temporal operators. The paper presents prominent examples of operational systems illustrating the advantages of OQL, enabling new possibilities for processing, access, subscription and dissemination of products

Data Information and Management System Architecture

This document presents the architectural design of the Data Information and Management System (DIMS). The DIMS provides a framework for Payload Data Ground Segment Solutions

Production of Polybutylene Terephthalate Glass Composite Powders and Characterization for Processing in Selective Laser Sintering

Additive manufacturing techniques, such as selective laser melting of plastics, generate components directly from a CAD data set without using a specific mould. The range of materials commercially available for selective laser sintering merely includes some semi crystalline polymers, mainly polyamides. In this contribution a recently proposed process route (grinding and rounding) which allows for production of spherical polymer micro particles is applied to glass-filled polybutylene terephthalate. Composite powders of good flowability are obtained. Process relevant material characteristics like powder flowability and thermal properties are investigated. The influence of filler content on grinding behavior and resulting materials properties is discussed.Mechanical Engineerin

Pushing the limits of HiFi assemblies reveals centromere diversity between two Arabidopsis thaliana genomes.

Funder: DFGFunder: Max Planck SocietyAlthough long-read sequencing can often enable chromosome-level reconstruction of genomes, it is still unclear how one can routinely obtain gapless assemblies. In the model plant Arabidopsis thaliana, other than the reference accession Col-0, all other accessions de novo assembled with long-reads until now have used PacBio continuous long reads (CLR). Although these assemblies sometimes achieved chromosome-arm level contigs, they inevitably broke near the centromeres, excluding megabases of DNA from analysis in pan-genome projects. Since PacBio high-fidelity (HiFi) reads circumvent the high error rate of CLR technologies, albeit at the expense of read length, we compared a CLR assembly of accession Eyach15-2 to HiFi assemblies of the same sample. The use of five different assemblers starting from subsampled data allowed us to evaluate the impact of coverage and read length. We found that centromeres and rDNA clusters are responsible for 71% of contig breaks in the CLR scaffolds, while relatively short stretches of GA/TC repeats are at the core of >85% of the unfilled gaps in our best HiFi assemblies. Since the HiFi technology consistently enabled us to reconstruct gapless centromeres and 5S rDNA clusters, we demonstrate the value of the approach by comparing these previously inaccessible regions of the genome between the Eyach15-2 accession and the reference accession Col-0

Determinants affecting the wearing of orthosis of middle-aged adults with rheumatoid arthritis in Barangay Malagasang 2-E, Imus City, Cavite

The study used quantitative-descriptive research design, wherein eight (8) respondents were gathered using purposive and convenience sampling methods. A researcher designed questionnaire which consisted of dichotomous questions regarding demographic data and the different determinants was administered and accomplished by the respondents. Data was analyzed through frequency distribution and measures of central tendency, specifically the mean values. Results of the study showed that out of the five determinants, namely personal, cultural, physical environment, social, and virtual influence, social influence was most described as many agreed that it influence the wearing of orthosis while physical environment was the least described to be affecting wearing of orthosis. However, all respondents of the study agreed in other statements under each determinant, which indicated that all have a certain influence whether they are either wearing their prescribed orthosis or not

Cycles of satellite and transposon evolution in Arabidopsis centromeres.

Centromeres are critical for cell division, loading CENH3 or CENPA histone variant nucleosomes, directing kinetochore formation and allowing chromosome segregation1,2. Despite their conserved function, centromere size and structure are diverse across species. To understand this centromere paradox3,4, it is necessary to know how centromeric diversity is generated and whether it reflects ancient trans-species variation or, instead, rapid post-speciation divergence. To address these questions, we assembled 346 centromeres from 66 Arabidopsis thaliana and 2 Arabidopsis lyrata accessions, which exhibited a remarkable degree of intra- and inter-species diversity. A. thaliana centromere repeat arrays are embedded in linkage blocks, despite ongoing internal satellite turnover, consistent with roles for unidirectional gene conversion or unequal crossover between sister chromatids in sequence diversification. Additionally, centrophilic ATHILA transposons have recently invaded the satellite arrays. To counter ATHILA invasion, chromosome-specific bursts of satellite homogenization generate higher-order repeats and purge transposons, in line with cycles of repeat evolution. Centromeric sequence changes are even more extreme in comparison between A. thaliana and A. lyrata. Together, our findings identify rapid cycles of transposon invasion and purging through satellite homogenization, which drive centromere evolution and ultimately contribute to speciation.This work was supported by BBSRC grants BB/S006842/1, BB/S020012/1 and BB/V003984/1, European Research Council Consolidator Award ERC-2015-CoG-681987, Marie Curie International Training Network ‘MEICOM’ and Human Frontier Science Program award RGP0025/2021 to IRH; EMBO long term postdoctoral fellowship ALTF224-2022 to RB; Human Frontiers Science Program (HFSP) Long-Term Fellowship (LT000819/2018-L) to FAR; Max Planck Society to DW; ERA-CAPS 1001G+ grant to MNo and DW; Royal Society awards UF160222, URF\R\221024, RGF/R1/180006 and RGF/EA/201030 to AB; European Research Council Award ERC HOW2DOBLE 101041354 to PYN; Czech Science Foundation grant number 21-03909S to ML; a BBSRC DTP Studentship to NG; a Broodbank Fellowship to MN; and grant PID2022-136893NB-I00 from the Ministerio de Ciencia e Innovación of Spain/Agencia Estatal de Investigación/10.13039/501100011033/FEDER, EU, to CAB