27 research outputs found
Predictive potential of genotypes within the prolactin, growth hormone and insulin-like growth factor-I pathways in genetic evaluation of 305 days milk yield in Holstein cows in Sonora, Mexico
No full textIncludes bibliographical references.2015 Summer.The objective of this study was to calculate a molecular breeding value (MBV) using single nucleotide polymorphims (SNP) within genes of the prolactin (PRL) and growth hormone and insulin-like growth factor (GH-IGF1) pathways associated with milk production traits and evaluate their effectiveness in genetic prediction in Holstein cows in Sonora, Mexico. We hypothesized that MBV constructed using DNA markers within the PRL and GH-IGF1 pathways have the potential to predict milk production traits in heat-stressed lactating Holstein cows. The data contained observations of 659 Holstein dairy cows collected during 2012 from the city of Obregón, Sonora, Mexico. Milk yield observations were recorded monthly and 305 d milk yield was calculated. Cows were genotyped for 179 tag SNP within 43 genes in the PRL and GH-IGF1 pathways. Eight SNP within 5 genes were associated with 305d milk yield (P ≤ 0.05). No previous research reported these associations. Their effects were used to estimate a MBV. The linear correlation of the MBV and 305 d milk yield was 0.21 and the adjusted R² was 4.5%. Genetic parameters were estimated in ASREML for 305 d milk yield (h² = 0.39 ± 0.11). A training and predicting exercise, was performed using SAS 9.4 with the same data set. The SNP effects and association were estimated and used to calculate an MBV. The MBV was estimated and evaluated by comparing estimates from a 5-fold strategy of random clustering. This procedure was repeated five times, resulting in five MBV. To evaluate the effectiveness of these MBV, correlations and adjusted R² were estimated between MBV and 305 d milk yield. One MBV (MBV5) was correlated (-0.27) and had an adjusted R² of 6.37%. The MBV estimated from SNP within the PRL and GH-IGF1 pathways genes was positive but weakly associated with 305 d milk yield. In the training-predicting exercise, only 1 of the 5 MBV explained a portion of the variation in 305 d milk yield. The small amount of phenotypic variation may be due to the small numbers of SNP used to calculate the MBV and the polygenic nature of the trait under heat stress conditions. The quality of the data, could also affect the results. We accept our hypothesis, the MBV was capable of predicting a portion of the phenotypic variation in 305 d milk yield in lactating Holstein cows in Sonora, MX. Nevertheless, the accuracy and amount of variability explained was not enough to be feasible for use in genetic selection procedures
Real-time bitrate reductie voor "schrijfsignalen" mbv. een microprocessor
No full textIn dit verslag wordt nagegaan of een microprocessor toegepast kan worden in een systeem ter verwerking van schrijfsignalen. Na de bouw van een 16 bits processor uitgaande van een ’’chipset" en het realiseren van enige faciliteiten om deze enigszins operationeel te maken, is een zend/ontvang codeer/decodeer programma geschreven voor schrijfsignalen. Daarin is gebruik gemaakt van een gemodificeerd DPCM algorithms. Het blijkt dat een microprocessor een reeële mogelijkheid biedt voor schrijfsignaalprocessing.Electrical Engineering, Mathematics and Computer ScienceTransmissie van Informati
Gerichte grensdetectie in een digitaal beeld mbv. dynamisch programmeren
No full textaanwezigheid van een grens of lijn. In deze scriptie wordt de precisie van een positionele procedure nader bestudeerd. De automatische procedure bestaat op de eerste plaats uit een gerichte grens- en lijndetectie m.b.v. dynamisch programmeren (locatie bepaling). Gericht wil zeggen, dat aanwezige voorkennis uit een GIS-oude toestand wordt gebruikt om alleen die delen van het digitale RS beeld met het kortste-route-algoritme dynamisch programmeren te onderzoeken, waar een grens of lijn kan worden verwacht. Zo'n gebied noemen we een Region Of Interest (ROI). Het andere onderdeel van de procedure is een statistische controle in de ROI op de aanwezigheid van een grens of lijnelement, welke eenvoudig maar effectief werkt.Civil Engineering and GeosciencesFotogrammetrie en remote sensin
Bodemtransport m.b.v. duinvoortplanting
No full textEen onderzoek naar de optimale tijdstap tussen twee metingen en de variatie van het transport over de breedte van de rivier. Oe bepaling van het todemtransport mbv. de duinvoortplantingsmethode geschiedt door de berekening van een duinvoortplantingssnelheid C en een lengte-eenheid S[*C]. Op grond van een nauwkeurigheidsbeschouwing van deze beide grootheden is een tijdstapcriterium en een filtercriterium afgeleid. Verder zijn beschouwd de variatie van het bodemtransport over de breedte van de rivier en de nauwkeurigheden waarmee deze transporten bepaald zijnHydraulic EngineeringCivil Engineering and Geoscience
moisture buffer value of vegetal concrete
No full textPublisher Copyright: © The Author(s), under exclusive licence to RILEM 2024.Previous studies on the moisture buffering characterization of hemp concrete have shown some discrepancies and difficulties for comparison. The aim of this paper is to raise warning points and define a robust protocol for Moisture Buffer Value (MBV) measurement of vegetal concrete. The applicability of the NORDTEST protocol was assessed by two round robin tests (RRT) on an industrial hemp concrete. Seven laboratories participated to the RRT. The first RRT specified a method for the conditioning of specimens prior to the MBV test, without added recommendation. Based on the shortcomings of the first RRT, a second RRT was performed with additional recommendations. For the test, the specimens should be representative of in-situ ones regarding exchange surface and orientation versus moisture flux. RRT2 confirmed that the exchange surface finishing widely affects the MBV results. Moreover, it underlined the effect of air velocity and the least efficiency of climate chambers with Peltier technology. The results obtained following this more detailed protocol were comparable between laboratories, suggesting their robustness to assess MBV of vegetal concrete.authorsversionpublishe
Bouwen met Blokken. Onderzoek om mbv een computermodel het operationele planningsproces van Connxxion te ondersteunen.
No full textTechnology, Policy and Managemen
The effect of pelvic floor exercise program on incontinence and sexual dysfunction in multiple sclerosis patients
No full textPurpose: Multiple sclerosis (MS) is a chronic neuroinflammatory disease of the central nervous system that involves different neurological areas. In addition to lower urinary tract symptoms (LUTS), sexual dysfunction (SD), and psychopathological effects, MS sometimes seriously impairs the quality of life (QoL). We hypothesize that the pelvic floor exercise program (PFEP) could improve bladder, sexual function, depression, and QoL in MS patients. Methods: Patients diagnosed with MS completed the Incontinence Questionnaire Short Form (ICIQ-SF), the Beck Depression Inventory (BDI), the Multiple Sclerosis Quality of Life-54 (MSQoL-54) questionnaire, and either the Female Sexual Function Index (FSFI) or the Sexual Health Inventory for Men (SHIM). Maximum bladder volumes (MBV) and post-voiding residual (PVR) volumes were measured using ultrasonography. The patients who regularly completed the PFEP for 12 weeks were asked to fill out the questionnaires again, and their MBV and PVR were remeasured. Results: Seventy-two patients with relapsing–remitting multiple sclerosis (RRMS) were included in the study. Forty-two (58.3%) RRMS patients reached the end of the study. The patients’ post-PFEP average MBV statistically increased (p = 0.01). In contrast, no statistically significant difference was found in the PVR (p = 0.2). After exercise, the FSFI values in women increased (p = 0.02), and ICIQ-SF and BDI values in all the RRMS patients statistically decreased (p = 0.004, p = 0.01, respectively), but there was no improvement in the MSQoL-54 score (p > 0.05). Conclusion: PFEP, which causes a reduction in LUTS by enhancing the MBV of RRMS patients, can be seen as an investment in the future in terms of reducing depression in MS patients and preventing or delaying SD in women. © 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature
Experimental and Numerical Analysis of a Silica Gel Packed Bed for Passive Humidity Control in Museum Rooms: MSc thesis
No full textIn this thesis the passive humidity control of indoor air is laid under review. This is primarily interesting for museum rooms, where strict requirements apply to the indoor air humidity. Passive humidity control is promising to contribute to stabilizing the relative humidity levels in a room. Besides, the use of passive humidity control can potentially reduce energy demand for (de)-humidification, and reduce HVAC dimensions as a consequence. This work has zoomed in on the (de)-humidification of air lead through a packed bed with silica gel beads. Silica gel is very promising to use as a buffer material for humidity control as a result of its high hygroscopic capacity, or slope of sorption isotherm.The work started with uptake rate measurements on different silica gel samples, referred to as Experiment 1. This has yielded adsorption and desorption isotherm between 20 and 80 %RH. The obtained isotherms provide insight in the sorption capacity of different samples, as well as the presence of sorption hysteresis.Samples with promising sorption and desorption behaviour were selected to include in an experiment with a packed bed. In this experiment, referred to as Experiment 2, silica gel was contained in a packed bed (column) and exposed to cyclic input: alternating high and low levels of relative humidity, using a step function. Both short (1h/1h) as well as long (8h/16h) cycles are executed in the experiment. In both types of experiments, significant dehumidification and humidification of air in the packed bed was measured.Next to experiments, a numerical model of the packed bed is developed. The results of this model are compared to experimental data from literature and to the experimental data obtained in Experiment 2. The model proves to be able to simulate the course of both temperature and humidity of outlet air exiting the packed bed in a reliable way. The main discrepancy between model and experimental results is found in the response time of the model: it reacts faster to changing inlet compared to measurements. Furthermore the model is sensitive to the inputted isotherm polynomial, RH(w). This polynomial describes the equilibrium of gaseous water in the air and adsorbed liquid water in the silica gel. This equilibrium applies at the interface of air and silica gel surface.Experiment 2 has shown silica gel is able to both adsorb and desorb water in the humidity range of 40 to 60 %RH. An important observation in the long runs of Experiment 2 is that more water is adsorbed than desorbed in the Ąrst cycles. Two issues can be mentioned to explain this: the samples can experience ŠprimaryŠ hysteresis: some water is permanently retained in silica gel during the Ąrst adsorption/desorption cycle. This is a plausible explanation for the difference in primary and secondary isotherms. The other potential explanation is sway-in behaviour: it takes some time before the effect of initial conditions is eliminated in a cyclic experiment. In this case, it is possible that some water is stored in the deeper layers of a silica bead. The moisture uptake and release by silica gel converges to an equal value.The performance in buffering moisture is expressed in the Moisture Buffering Value (MBV) in [g/m3/%RH]. This MBVτ accounts for the time period of the expected humidity fluctuations. The maximum, or theoretical, MBV∞ is derived from the equilibrium isotherm. For a given time period of the expected humidity fluctuations, the part of the hygroscopic capacity of silica gel that is effectively used is expressed as:ξeffective = (MBVτ / MBV∞) · ξtheoretical (1)The MBVτ is determind based on experimental results in this project. The numerical PGC model can serve as a tool to simulate MBV (and ξeffective) for different geometries of the silica gel container and different humidity input.Concluding, silica gel is well able to reduce Ćuctuations in relative humidity of indoor air. It is important that the silica gel is well reachable by indoor air. Uniform utilization of the silica gel will increase the effective part of the (theoretical) hygroscopic capacity, ξeffective in [kg/m3], of the silica gel. It is best to avoid long lengths of silica, since the effectiveness of ŠupperŠ silica gel is reduced.Relative humidity fluctuations can occur either due to changes in absolute humidity (hygric loads) or due to temperature Ćuctuations in a room. If relative humidity fluctuations are due to changes in absolute humidity, performance of the packed bed could be improved by cooling the silica during adsorption (dehumidification of air) and heating during desorption (humidification of air). Energy demand for temperature control of the silica gel should be limited, to not mitigate the profits in energy demand for passive humidity control.Civil Engineering | Building Engineerin
Assets in the Company as a Source of Competitive Advantage at Turbulent Times
No full textCelem rozważań jest przedstawienie koncepcji zarządzania poprzez wartości (Managing by Values– MBV) jako źródła przewagi konkurencyjnej
firmy w niestabilnych czasach. Odwołując się do pojęć kultury organizacji oraz hierarchii potrzeb według Maslowa, Rosenberga i Diltsa, autorka uzasadnia tezę o potrzebie odejścia od zarządzania wartością firmy przez instrukcje czy też cele. Na potwierdzenie słuszności tego kierunku myślenia przytacza m.in. wyniki badań ECCO Network oraz cyklicznie publikowany raport z cyklu Corporate Values Index.An aim of considerations is to presents the concept of managing by values (MBV) as a source of company’s competitive advantage at turbulent times. Referring to the notions of culture of organisation and the hierarchy of needs by Maslow, Rosenberg and Dilts, the author is reasoning the thesis of the need to depart from company’s assets managing by instruction or by objectives. To confirm the validity of this direction of thinking she provides, inter alia, results of surveys of ECCO Network as well as the cyclically published report in the series called Corporate Values Index
Effect of Biomass Waste Materials as Unconventional Aggregates in Multifunctional Mortars for Indoor Application
No full textAbstractIn order to decrease energy consumption in buildings, a new way to recycle materials coming from biomasses waste in mortars was studied. For this purpose, mortars with water/cement equal to 0.5 by weight and aggregate/cement equal to 3.5 by volume were considered. Cement was replaced by hydraulic lime and sand was substituted with two different types of spruce sawdust shavings (as it is and roasted), biomass bottom ash and biomass fly ash. The results show that mortar prepared with cement has obviously a better mechanical strength and 60% lower capillary water absorption. All unconventional aggregates increase the total porosity of lime mortars. Moreover, biomass fly ash and both spruce sawdust shavings based mortars can be classified as lightweight mortar. Regardless of porosity and lightness, biomass bottom ash improves up to 150% the mechanical performance of lime-based mortars. Concerning durability, bio-based lime mortars show in general nearly twice higher capillary water absorption with respect to the sand lime mortars whit the exception of spruce sawdust shavings and biomass bottom ash. Mortars can be classified as permeable to water vapour. As it is and roasted spruce sawdust shavings are able to increase three and two times the capacity of the mortar to be a hygroscopic buffer in terms of MBV values
