TY - JOUR A1 - Spangenberg, Joachim H. A1 - Lorek, Sylvia T1 - Who cares (for whom) JF - Frontiers in Sustainability Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-160675 PB - Frontiers Media ER - TY - JOUR A1 - Borghoff, Lisa Marie A1 - Strassner, Carola A1 - Herzig, Christian T1 - Organic Juice Processing Quality from the Processors’ Perspective: A Qualitative Study JF - foods N2 - Organic food quality is based on processing. While the EU organic production regulation focuses on agricultural production, private standards provide more detailed information about further processing. For the development of organic processing, practitioner perspectives can provide valuable input. To get insight into practitioner perspectives, we conducted semi-structured expert interviews with nine employees of seven partly organic juice processing companies from Germany and Austria. Interview topics were (i) quality of organic juice processing in general, (ii) assessment of specific processing techniques, (iii) product quality of organic juice and (iv) flow of information between producer and consumer. We conducted a thematic analysis. We found that the experts’ understanding of process quality mostly includes more aspects than the EU organic production regulation. It covers the whole food chain plus aspects of social and environmental sustainability. The experts prefer directly bottled juice of local raw materials but chiefly accept juice made from concentrate of exotic raw materials because of environmental concerns. Organic juice is preferred when it is cloudy and natural fluctuations are interpreted as an indicator of natural quality. The experts report that consumer information is challenging because of low food literacy. Raising this might help reduce the number of processed juices on the market. KW - organic food processing KW - organic food quality KW - juice processing KW - expert interviews KW - Germany Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-156994 SP - 1 EP - 18 PB - MDPI ER - TY - JOUR A1 - Borghoff, Lisa Marie A1 - Strassner, Carola A1 - Herzig, Christian T1 - Processors' understanding of process quality: a qualitative interview study with employees of organic dairies in Germany and Switzerland JF - British Food Journal N2 - Purpose: Organic food processing must include organic principles to be authentic. This qualitative study aims to understand the processors' understanding of organic food processing quality. Design/methodology/approach: This study is based on semi-structured expert interviews with eight employees of six purely or partly organic dairies from Germany and Switzerland. Interview themes are (1) quality of organic milk processing in general, (2) assessment of specific processing techniques, (3) product quality of organic milk and (4) flow of information between producer and consumer. The interviews have been audio-recorded, transcribed verbatim and thematically analysed. Findings: (1) Experts prefer minimal processing; some prefer artisanal processing, whilst others stress the advantages of mechanisation. (2) High temperature short time (HTST) pasteurisation and mechanical processing techniques are accepted; ultra-high-temperature (UHT) milk processing is partly rejected. (3) Traditional taste and valuable ingredients should be present in the final product. Natural variances are judged positively. (4) Consumers' low level of food technology literacy is challenging for communication. Research limitations/implications: The results cannot be generalised due to the qualitative study design. Further studies, e.g. qualitative case analyses and studies with a quantitative design, are necessary to deepen the results. Practical implications: The paper shows which processing technologies experts consider suitable or unsuitable for organic milk. The paper also identifies opportunities to bridge the perceived gap between processors' and consumers' demands. Originality/value: The study shows the challenges of processors in expressing the processors' understanding of process quality. KW - organic milk processing KW - quality perception KW - expert interviews KW - qualitative text analysis Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-157019 SN - 0007-070X SP - 1 EP - 32 PB - Emerald Publishing ER - TY - CHAP A1 - Wittrock, Ulrich A1 - Welp, Petra T1 - Adaptive laser resonator control with deformable MOEMS mirrors T2 - MEMS/MOEMS Components and Their Applications III, Proc. SPIE N2 - Adaptive laser resonators with deformable MOEMS mirrors under closed-loop control are discussed and experimental results are presented. The requirements for deformable mirrors and for closed-loop control systems of these mirrors are analyzed. Several deformable mirrors have been characterized and the results are presented. Currently available membrane mirrors deform under laser load and need further development before they can be used for aberration correction of solid state lasers above some tens of Watts. Nevertheless, the results are encouraging and the requirements are within reach of currently available technology. Finally, we demonstrate an Nd.YVO4-laser with a closed-loop adaptive resonator and more than 6 W of output power. The closed-loop system was able to compensate artificially introduced aberrations from a phase plate. Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-6537 VL - 6113 SP - 61130C PB - SPIE ER - TY - JOUR A1 - Heuck, Hans-Martin A1 - Neumayer, Paul A1 - Kühl, Thomas A1 - Wittrock, Ulrich T1 - Chromatic aberration in petawatt-class lasers JF - Appl. Phys. B N2 - In order to avoid optical damage and non-linear effects, high-power, high-energy lasers of the petawatt class like PHELIX (petawatt high-energy laser for heavy-ion experiments) use large-aperture optics. Usually, chromatic aberration associated with these optical elements is neglected. By means of numerical simulations, we show how the chromatic aberration affects the focal intensity pattern. In particular, we make quantitative predictions of how chromatic aberration decreases the focused peak intensity. Furthermore, we prove the feasibility of a new interferometer that measures the temporal pulse front distortions which arise from expansion telescopes. We also propose a scheme that pre-compensates these distortions. Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-6523 VL - 84 SP - 421 EP - 428 PB - Springer ER - TY - JOUR A1 - Buske, Ivo A1 - Wittrock, Ulrich T1 - Diffraction analysis of aberrated laser resonators JF - Appl. Phys. B N2 - A numerical analysis of laser resonators with aberrations is presented. {T}he analysis shows that aberrations lead to large diffraction losses of laser resonators which are laid out to produce diffraction-limited beam quality. {S}tatic or dynamic compensation of the aberrations is possible and would yield much higher output power. Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-8252 VL - 83 SP - 229 EP - 233 ER - TY - JOUR A1 - Stuber, Franz T1 - Betriebliche Praxisfelder erschließen - Ein Informationsportal unterstützt forschendes Lernen in Praxisstudien JF - bwpat N2 - Ein Beitrag über das Informationsportal "Betriebliche Praxisfelder erschließen" zur Unterstützung des forschenden Lernens in Praxisstudien. Y1 - 2007 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-4644 UR - http://www.bwpat.de/ausgabe12/stuber_bwpat12.shtml SN - 1618-8543 PB - bwp CY - Hamburg ER - TY - JOUR A1 - Müller, Carsten A1 - Winter, Corinna A1 - Rosenbaum, Dieter A1 - Boos, Joachim A1 - Gosheger, Georg A1 - Hardes, Jendrik A1 - Vieth, Volker T1 - Early decrements in bone density after completion of neoadjuvant chemotherapy in pediatric bone sarcoma patients JF - BMC Musculoskeletal Disorders N2 - Background Bone mineral density (BMD) accrual during childhood and adolescence is important for attaining peak bone mass. BMD decrements have been reported in survivors of childhood bone sarcomas. However, little is known about the onset and development of bone loss during cancer treatment. The objective of this cross-sectional study was to evaluate BMD in newly diagnosed Ewing's and osteosarcoma patients by means of dual-energy x-ray absorptiometry (DXA) after completion of neoadjuvant chemotherapy. Methods DXA measurements of the lumbar spine (L2-4), both femora and calcanei were performed perioperatively in 46 children and adolescents (mean age: 14.3 years, range: 8.6-21.5 years). Mean Z-scores, areal BMD (g/cm2), calculated volumetric BMD (g/cm3) and bone mineral content (BMC, g) were determined. Results Lumbar spine mean Z-score was -0.14 (95% CI: -0.46 to 0.18), areal BMD was 1.016 g/cm2 (95% CI: 0.950 to 1.082) and volumetric BMD was 0.330 g/cm3 (95% CI: 0.314 to 0.347) which is comparable to healthy peers. For patients with a lower extremity tumor (n = 36), the difference between the affected and non-affected femoral neck was 12.1% (95% CI: -16.3 to -7.9) in areal BMD. The reduction of BMD was more pronounced in the calcaneus with a difference between the affected and contralateral side of 21.7% (95% CI: -29.3 to -14.0) for areal BMD. Furthermore, significant correlations for femoral and calcaneal DXA measurements were found with Spearman-rho coefficients ranging from ρ = 0.55 to ρ = 0.80. Conclusions The tumor disease located in the lower extremity in combination with offloading recommendations induced diminished BMD values, indicating local osteopenia conditions. However, the results revealed no significant decrements of lumbar spine BMD in pediatric sarcoma patients after completion of neoadjuvant chemotherapy. Nevertheless, it has to be taken into account that bone tumor patients may experience BMD decrements or secondary osteoporosis in later life. Furthermore, the peripheral assessment of BMD in the calcaneus via DXA is a feasible approach to quantify bone loss in the lower extremity in bone sarcoma patients and may serve as an alternative procedure, when the established assessment of femoral BMD is not practicable due to endoprosthetic replacements. KW - Bone Mineral Density KW - Lumbar Spine Bone Mineral Density KW - Areal Bone Mineral Density KW - Osteosarcoma Patient KW - Bone Mineral Density Loss Y1 - 2010 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-168661 VL - 11 IS - 287 SP - 1 EP - 8 ER - TY - JOUR A1 - Winter, Corinna A1 - Brandes, Mirko A1 - Müller, Carsten A1 - Schubert, Tim A1 - Ringling, Michael A1 - Hillmann, Axel A1 - Rosenbaum, Dieter A1 - Schulte, Tim T. T1 - Walking ability during daily life in patients with osteoarthritis of the knee or the hip and lumbar spinal stenosis JF - BMC Musculoskeletal Disorders N2 - Background Degenerative musculoskeletal disorders are among the most frequent diseases occurring in adulthood, often impairing patients' functional mobility and physical activity. The aim of the present study was to investigate and compare the impact of three frequent degenerative musculoskeletal disorders -- knee osteoarthritis (knee OA), hip osteoarthritis (hip OA) and lumbar spinal stenosis (LSS) -- on patients' walking ability. Methods The study included 120 participants, with 30 in each patient group and 30 healthy control individuals. A uniaxial accelerometer, the StepWatch™ Activity Monitor (Orthocare Innovations, Seattle, Washington, USA), was used to determine the volume (number of gait cycles per day) and intensity (gait cycles per minute) of walking ability. Non-parametric testing was used for all statistical analyses. Results Both the volume and the intensity of walking ability were significantly lower among the patients in comparison with the healthy control individuals (p < 0.001). Patients with LSS spent 0.4 (IQR 2.8) min/day doing moderately intense walking (>50 gait cycles/min), which was significantly lower in comparison with patients with knee and hip OA at 2.5 (IQR 4.4) and 3.4 (IQR 16.1) min/day, respectively (p < 0.001). No correlations between demographic or anthropometric data and walking ability were found. No technical problems or measuring errors occurred with any of the measurements. Conclusions Patients with degenerative musculoskeletal disorders suffer limitations in their walking ability. Objective assessment of walking ability appeared to be an easy and feasible tool for measuring such limitations as it provides baseline data and objective information that are more precise than the patients' own subjective estimates. In everyday practice, objective activity assessment can provide feedback for clinicians regarding patients' performance during everyday life and the extent to which this confirms the results of clinical investigations. The method can also be used as a way of encouraging patients to develop a more active lifestyle. KW - Gait Cycle KW - Lumbar Spinal Stenosis KW - Walking Ability KW - Healthy Control Individual KW - Zygapophyseal Joint Y1 - 2010 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-168673 VL - 11 IS - 233 SP - 1 EP - 7 ER - TY - RPRT A1 - Linssen, Ruth A1 - Litzcke, Sven. M. A1 - Schön, Felix A1 - Schilling, Jan T1 - Korruption und Gewissenhaftigkeit N2 - Online-Veröffentlichung Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:836-opus-4510 PB - Hochschule Hannover ER -