Dissertations / Theses on the topic 'Dattes'
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Hammouda, Hédi. "Les polyphénols des dattes (Phoenix Dactylifera L. ) : caractérisation, localisation cellulaire, oxydation et interactions pariétales au cours de la maturation." Rennes, Agrocampus Ouest, 2013. http://www.theses.fr/2013NSARB239.
Full textDate fruits (Phoenix dactylifera) were studied for their polyphenol composition in three tissue zone (skin, pulp and stone) and at successive maturity stages. Condensed tannins (procyanidin polymers) are largely preponderant in soft tissues under a highly polymerized form (DPn 20-30) with concentrations decreasing according to the maturation. Nevertheless, ripe dates are still highly polyphenol concentrated with levels close to 150 mg per fruit. Tannins are also present in stones under a less polymerised form (DPn 7-12). Other phenolic classes are catechins, hydroxycinnamates and flavonols, the later being mainly concentrated in the epidermis zone. The use of photonic and electronic microscopy revealed the presence of tannins in the vacuoles of very large cells located in a specific zone of the mesocarp tissues whereas flavonols appeared specifically located in an internal cell-layer of the epicarp. Stone tannins are specifically located in an internal cell-layer of the testa. Tannins of the insoluble fraction of the soft tissues showed strong differences in term of extractability according to the maturity stage. At the ripe stage, they were strongly associated to the cell-wall matrix and their analysis by LC-MS following their depolymerisation by phloroglucinolysis revealed particular structure changes related to their oxidation. The results allow a better understanding of the role of polyphenols related to organoleptic changes in dates according to the maturation. In addition, it opens new perspectives concerning their nutritional impact in this fruit
Ouennoughi, Mélica. "Les descendants d'algériens en Nouvelle Calédonie et la culture du palmier dattier : symbolisme et caractérisation du patrimoine variétal." Paris 8, 2004. http://www.theses.fr/2004PA082378.
Full textThe first part of the PhD reconstitutes the phenomenon of introduction of the date palm into the old Maghreb and in West Africa. With the appearance of the almoravides in XIème century, one attends the considerable development of the palm plantations. Under the Eastern influence of the Pheonicians, Andalusia entered the trade-circuits. Centuries later, this one was reconquered by Berbers coming from the Maghreb who introduced the first varietals date selections. In the second part of our work, we have developed the distribution of Berbers dates cores in New Caledonia. This results from the historical presence of the Algerians off-set on the Caledonian territory at the XIXème century. Who are these Berbers and which development (social, religious, politic or economic structure) through the heritage of their ancestors, have been introduced through the date palms trees? It leads us to seek the causes of the insurrections related partly of the destructurations of the organizations of the village communities (djemâas) caused by the colonial phenomenon in Algeria
Chniti, Sofien. "Optimisation de la bioproduction d'éthanol par valorisation des refus de l'industrie de conditionnement des dattes." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S118/document.
Full textConditioning unit's dates generate large amounts of wastage after sorting. This biomass, previously regarded as waste product with a high impact on the environment can be transformed into a highly valued product. The use of by-products of date fruit into biofuel industry is a part of an environmentaly friended economic process. But high levels of sugars in the syrups of dates induce high osmotic pressure which limits the ability of fermentative microorganisms such as Saccharomyces cerevisiae. This led us to use osmotolerant strains, Zygosaccharomyces rouxii and Candida pelliculosa. Various tests were conducted in culture media containing date juice at different levels in sugars, and perfectly stirred in batch conditions. The tests performed in a culture medium based on date juice at 17.4 ° Brix, led to the production of 63 g L-1, 41 g L-1 and 33.1 g L-1 of ethanol for the yeasts Saccharomyces cerevisiae, Candida pelliculosa and Zygosaccharomyces rouxii, respectively. Tests conducted at 35.8 °Brix (culture medium close to syrup raw dates) show that the growth of yeast Saccharomyces cerevisiae and Candida pelliculosa is inhibited by high osmotic pressure caused by the high concentration of sugars. Only the xerotolerante yeast Zygosaccharomyces rouxii is adapted to the environment and produced 55 g L-1 of bioethanol. The strain isolated from by-products of dates, identified as bacillus amyloliquefaciens, is able to develop in a hyper-osmotic environment and convert the three sugars (glucose, fructose and sucrose) into ethanol, unlike Z. rouxii which is a fructophilic strain. The yield of ethanol for the M-S175 is 0.45 g.g-1, higher than those of S. cerevisiae, C. pelliculosa and Z. rouxii which give respectivemnt 0.38, 0.28 and 0.34 g.g-1. By producing 90 g.L-1 of ethanol for M-S350, B. amyloliquefaciens seems promising to valorize a very rish substrate in fermentable sugars
Reynes, Max. "Influence d'une technique de désinfestation par micro-ondes sur les critères de qualité physico-chimiques et biochimiques de la datte." Vandoeuvre-les-Nancy, INPL, 1997. http://docnum.univ-lorraine.fr/public/INPL_T_1997_REYNES_M.pdf.
Full textKaraa, Meriam. "Les déterminants de l'adoption de la traçabilité par les entreprises de conditionnement de dattes en Tunisie." Thesis, Aix-Marseille 2, 2010. http://www.theses.fr/2010AIX24030/document.
Full textThe traceability is considered as an answer to the state of uncertainty due mainly to the foodcrises of the end of the XXth century. With the application of the European regulationsn°178/2002 on January 1st, 2005, all the actors of the food chain must be mobilized to bring the maximum of guarantee and insurance to the final consumers, in terms of quality and safety. In the case of the Tunisian date sector, the traceability - as an approach of strategic management- appears like a managerial innovation which always comes within the phase of adoption.Our research comes within the scope of this framework. The aim of this research is to identify the determiners of the adoption of an approach of traceability with the example of the companies of date conditioning in Tunisia. So we present a modelling by suggesting associating the theory of the stakeholders to the theory of diffusion and adoption of the innovation.We discuss three generic propositions of research put forward by basing on a qualitative analysis with conditioning date companies considered as "pioneers" in tunisian traceability.The results of this research end up in the elaboration of a set of determiners of the adoption of the traceability with in the conditioning date companies’ link in Tunisia. It represents the characteristics of the traceability, the characteristics of the organization and, the characteristics of the environment such as specified in our model, to which it is advisable to add the fourth element stemming from the analysis of the interviews and which concerns the transversal factors
Nancib, Ayacha Boudrant Joseph. "Production d'acide lactique par Lactobacillus casei subsp. rhamnosus sur jus de datte cinétique et optimisation en cultures discontinues, semi-continues et continues /." S. l. : INPL, 2007. http://www.scd.inpl-nancy.fr/theses/2007_DJIDEL_A.pdf.
Full textBouhamed-Masmoudi, Farah. "Traitement de micropolluants minéraux par phytoremédiation et par adsorption sur charbon actif dérivé de noyaux de dattes." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10203.
Full textThis work aims to evaluate and optimize the use of an activated carbon derived from date stones as an adsorbent material to remove Cd2+, Pb2+, Cu2+, Zn2+ and Ni2+. This material was also used for retention of arsenic (III). The same activated carbon was impregnated with ferrihydrite and also used for the adsorption of these metallic elements. The first stage consisted in preparing and determining the physic-chemical characteristics of materials using several methods including X-ray diffraction, chemical analysis, infrared spectroscopy, electron microscopy and specific surface area. The batch adsorption studies were carried out for several metal ions, namely Cd2+, Pb2+, Cu2+, Zn2+ and Ni2+. The adsorption equilibrium was reached at the end 120 minutes for the two prepared adsorbent. The metal experimental data fitted well with the Langmuir and Freundlich adsorption model. The based maximum adsorption capacities (qm) affinity order corresponds to Pb2+ > Cd2+ > Cu2+ > Ni2+ > Zn2+ for both activated carbon and impregnated activated carbon. One of the possible implementation of this process consists in metals laden plating factory effluents treatment. Understanding how the metals are immobilized at the molecular level is critical for formulating effective metal containment strategies, such as chemical immobilization. In this work, exchangeable metal contents and metal accumulation by plants in a contaminated soil, untreated or amended with activated carbon, were investigated
Sahmarani, Rayane. "Valorisation des déchets agroalimentaires (noyaux des dattes-Phoenix Dactylifera) pour l’élimination des pesticides organochlorés des eaux contaminées." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R079.
Full textThe objective of this thesis is to propose an innovative approach for the depollution of contaminated water by organochlorine pesticides used an adsorption technique on activated carbons from date stones (species : Phoenix dactylifera, types : Ajwa, Anbari et Khudri). Then, study the retention capacity of these column materials in the laboratory with applications on contaminated sites (effluents of agriculture and wastewater treatment plants).The preparation of better activated carbons from date stones by a simple process of pyrolysis preceded by a chemical impregnation with phosphoric acid. Several parameters will be studied in order to determine the optimal conditions of the adsorption such as dose of the adsorbent, pH of the solution, initial concentration of pesticides and time of contact, since the adsorption capacity of an activated carbon depends in part on the capability between the pore size and the dimension of the adsorbed molecules. Therefore, it is essential to optimize the production of activated carbon
Sahmarani, Rayane. "Valorisation des déchets agroalimentaires (noyaux des dattes-Phoenix Dactylifera) pour l’élimination des pesticides organochlorés des eaux contaminées." Electronic Thesis or Diss., Université de Lille (2018-2021), 2019. http://www.theses.fr/2019LILUR079.
Full textThe objective of this thesis is to propose an innovative approach for the depollution of contaminated water by organochlorine pesticides used an adsorption technique on activated carbons from date stones (species : Phoenix dactylifera, types : Ajwa, Anbari et Khudri). Then, study the retention capacity of these column materials in the laboratory with applications on contaminated sites (effluents of agriculture and wastewater treatment plants).The preparation of better activated carbons from date stones by a simple process of pyrolysis preceded by a chemical impregnation with phosphoric acid. Several parameters will be studied in order to determine the optimal conditions of the adsorption such as dose of the adsorbent, pH of the solution, initial concentration of pesticides and time of contact, since the adsorption capacity of an activated carbon depends in part on the capability between the pore size and the dimension of the adsorbed molecules. Therefore, it is essential to optimize the production of activated carbon
Meroufel, Bahia. "Adsorption des polluants organiques et inorganiques sur des substances naturelles : Kaolin, racines de Calotropis procera et noyaux de dattes." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0289/document.
Full textThe first aim of the studies presented in this thesis is to characterize a kaolin clay deposit in south-western Algerian region which has never been exploited, to improve the surface properties of the clay due to changes made by coating with an amino silane (APTES) or cationic exchange with a surfactant (CTAB), which allowed us to develop the active sites on the surface of this material. The prepared materials were characterized by XRD, TGA, FTIR and SEM. Two other vegetable materials of great abundance in the southwest Algerian who are the roots of the plant Calotropis Procera and Feggous date stones are also characterized. The second aim of this study is the application of these materials in removing different kinds of pollutants in aqueous solutions: heavy metals (Zn (II) and Mn (II)) and anionic and cationic synthetic dyes (Congo red and Purple gentian) to the effectiveness demonstration of the clay and vegetable materials to adsorb these pollutants. The study of adsorption is to discuss the effects of contact time, pH and initial concentration of the solute using a batch adsorption technique. The effect of temperature has achieved a thermodynamic study to define the nature of adsorption phenomena. In addition, different kinetic models (first and second order) and adsorption isotherms (Langmuir and Freundlich) are used to assess the ability of clay materials (K08, KC and KS) and vegetable materials (CP and ND) to adsorb such organic and inorganic pollutants. The natural clay (K08) showed good affinity towards all pollutants with remarkable adsorption capacity, this capacity has evolved considerably by modifications. The modified kaolin (KS) proves the best adsorbent for these types of pollutants (heavy metals and synthetic dyes). The roots of CP have a very good affinity for heavy metals, while the date stones give more remarkable results for biosorption dyes
Cherif, Sarra. "Variation de la qualité des dattes en fonction des conditions de conservation et des traitements post-récolte Effet de la température et de la durée de conservation sur la qualité des dattes ‘Deglet Nour’ Does hydratation of ‘Deglet Nour’ date palm fruits after harvest improve their organoleptic and nutritional characteristics? European Food Research and Technology." Thesis, Avignon, 2021. http://www.theses.fr/2021AVIG0726.
Full textThe production of dates is increasing every season, causing losses especially during post-harvest handling andmarketing. Post-harvest handling plays an important role in maintaining date palm. In order to preserve organolepticand nutritional quality of date palm fruits after harvest with improving their commercial value, storage experiments andpost-harvest treatments have been assayed.The effect of different storage conditions of temperature, time and modified atmosphere, as well as the effectof heat treatment of dates, on firmness, colour, sugars, organic acids, polyphenols and cell walls and compositions havebeen studied.‘Deglet Nour’ date palm fruits of two harvest seasons (2017 and 2018) as well as common date cultivars‘Arichti’, ‘Bouhattam’ and ‘Bser Hlou’ consumed at early maturity stage (Khalal stage), were stored at -18, 0, 2 and 4°C for 3, 6 and 9 months and at 2 °C for 30 and 60 days, respectively. Mid Infrared Spectroscopy (MIR) as a nontargetedmethod allowed to highlight a year effect on 'Deglet Nour’ chemical composition and to discriminate samplesstored at 4 and 2 °C regarding to major components (moisture, sugar, organic acids...). Cell wall yields (assimilated tofiber) as well as procyanidins, accounting for 98% of total polyphenols, were stable during ‘Deglet Nour’ and ‘Arichti’cultivars storage regardless of temperature and time conditions. However, these same components were the mostaffected by storage conditions for ‘Bouhattam’ and ‘Bser Hlou’ cultivar. This latter, was the softest cultivar and themost appreciated by consumers, may be because of reducing sugars increase affecting its sweet taste. Thus, stored fruitsat -18 °C could be the solution for a long-term storage but due to its high energetic costs, 2 °C must be the optimaltemperature. Moreover, in order to valorize common dates palm and prolong their shelf life, storage time could beprolonged for ‘Arichti’ cultivar with temperature storage ptimization for ‘Bser Hlou’ and ‘Bouhattam’ cultivars.Date palm fruits mentioned above, were also stored under Modified Atmosphere packaging (MAP) at 2°Cduring 3, 6 and 9 months for ‘Deglet Nour’ and during 30 and 60 days for commons cultivars (‘Arichti’, ‘Bouhattam’and ‘Bser Hlou’). In general, differences were observed on physical and chemical parameters using different MAPstreatments for ‘Deglet Nour’date palm fruits. Dates became darke with MAPT and MAPA storage. Dates palm storedunder this latter MAP bag showed an increase on procyanidins, some cell walls compositions, fructose and citric acid.Firmness loss of this cultivar was delayed with MAPZ storage with polyphenols stability. This latter bag type conservedfirmness and colour of the three studied cultivars (‘Arichti’, ‘Bouhattam’ and ‘Bser Hlou’) were stabe with no differencecomparing to control (without MAP). Organic acids, cell walls yield and composition, polyphenols were also stableduring storage. Only sugars contents of every cultivars had different behaviour.These results showed that MAP bags had very lower benefical effects than storage time and temperature on ‘date palmquality. So, their use in date processing industries could have more costs with no apparent effects.The organoleptic and nutritional quality of ‘Deglet Nour’ date palm was also evaluated before and afterhydration treatment commonly used in date prcessing units (DPU), in order to become more commercially valued andto minimize waste generated along the date palm fruit supply chain. Hydration treatment under saturated steam at 60-62°C for 4 hours impoved date fruits texture as expected while nutritional parameters were quite stable. Mid InfraredSpectroscopy (MIR) allowed to discriminate samples from the three DPUs suggesting to be adopted in DPU as a newpredictive and no destructive technique. So, hydration treatment could be highly recommended to valorize fruit byproducts.However, it needs to be optimized for the very hard-type dates
انتاج التمور في ارتفاع مستمر من موسم الى اخر مما يجعل مراكزالفرز و التخزين تتخلص من كميات هائلة من التمور المتضررة أثناءعمليات الفرز والتسويق. هذه العمليات تلعب دورا هاما في الحفاظ على جودة التمور. ومن أجل الحفاظ على الجودة الغذائية للتمور بعد الجنيمع تحسين قيمتها التسويقية، تم القيلم بتجارب التخزين وبعض معالجات ما بعد الجني.وقد تم دراسة تأثير ظروف التخزين المختلفة من درجة الحرارة، مدة الخزن وتقنية الجو الهوائي المعدل، وكذلك تأثير معالجة التمور الجافةعلى الصلابة، اللون، السكريات، الأحماض العضوية، البوليفينول وجدران الخلايا النباتية (الالياف) ومكوناتها.تم تخزين تمور ’ دقلة النور’ لصابة 2017 و 2018 والأصناف الأخرى من التمور الأقل انتشارا مثل ’ الارشتي’، ’ بو حتم’، ’ بسر حلو’18 درجة مائوية وفي 2 درجة مائوية لمدة - ,0 ,2 , التي تستهلك في مرحلة متقدمة من النضج (خلال)، لمدة ثلاثة، ستة وتسعة أشهر في 430 و 60 على التوالي. اثبت التحليل الطيفي بالأشعة تحت الحمراء الوسطى ان سنة الجني لها تاثير على العناصر الكيميلئية للتمور’ دقلةالنور’ وقامت بتمييز التمور المخزنة في 2 و 4 درجة مائوية بالنسبة لاهم مكوناتها (الماء، السكريات، الأحماض العضوية...). اثبت النتائجان جدران الخلايا النباتية (الالياف) وان أكبر مكونات البوليفينول (بروسيانيدين) كانت مستقرة اثناء تخزين تمور’ دقلة النور’ و ’ الارشتي’،بغض النظر عن درجة حرارة ومدة التخزين. نفس هذه العناصر كانت الأكثر تاثرا بعوامل التخزين بالنسبة لاصناف’ بو حتم’ و ’ بسرحلو’. هذا الصنف الأخير كان الأكثر ليونة مع تغير بنية جدران الخلايا على الرغم من انه أكثر صنف قابلية لدى المستهلك، من الممكنبسبب ارتفاع كمية السكريلت السريعة التي اثرت على مذاقه الحلو.فبحيث ان تخزين التمور ’ دقلة النور’ في - 18 درجة مائوية من الممكن ان يكون أحسن حل على مدى طويل، لكن نظرا لتكاليفة الطاقيةالباهضة، تخزين التمور في 2 درجة مائوية يجب ان يكون أفضل حل. بصفة عامة لم يكن هناك خسائر هامة للقيمة الغذائية بالنسبة لاصنافالتمور الاخرى اثناء التخزين، مما يجعل التمديد في مدة التخزين ممكنا بالنسبة اصنف’ الارشتي’ مع البحث عن درجة حرارة تخزين ناجعةالصنف ’ بسر حلو’ و’ بو حتم’.تم ايضا تخزين انواع التمور المذكورة اعلاه بتقنية الجو الهوائي المعدل في 2 درجة مائوية لمدة ثلاثة، ستة وتسعة أشهربالنسبة ’ لدقلةالنور’ ولمدة 30 و 60 يوم بالنسبة للاصناف الأخرى. بصفة عامة هناك اختلافات في العناصر الفيزيلئية والكيميلئية ’ لدقلة النور' المخزنةفي كل أنواع تقنيات الجو الهوائي. ' دقلة النور' المخزنة في أكياس ترندلايف و ايباك. أصبحت داكنة الون.دقلة النور المخزنة في أكياس ' سجلت ارتفاعا في مكونات جدران الخلايل, بروسيانيدين, الفروكتوز و حامض السيتريك. تخزين' دقلة النور'في أكياس زويباك اخرت في ليونتها مع استقرار في البوليفينول. هذه النتائج اثبتت ان تخزين التمور في اكياس الجو الهوائي المعدل لم تكنذو نجاعة عالية مقارنة بعوامل الحرارة والمدة الزمنية.لون وصلابة التمور من اصناف ’ الارشتي’، ’ بو حتم’، ’ بسر حلو’ اثبتت استقرارها بعد تخزينها في أكياس زويباك, لكن بعدم ايجاد فرقمقارنة بالتمور المخزنة بدون اكياس الجو الهوائي المعدل, مثلها مثل بقية العناصر الفيزيلئية والكيميلئي بصفة عامة. هذا يثبت ان استعمالهافي مصانع تخزين التمور ليس له جدوى اقتصادية واضحة.تم دراسة مدى تاثر القيمة الغذائية لتمور ’ دقلة النور’ الجافة على إثر معالجتها وترطيبها بالطريقة الهعتدة في اغلب مصانع تخزين التمور62 درجة مائوية لمدة 4 ساعات - لتكون ذات قيمة تسويقية عالية ولتقليص كمية الخسائر. تقنية ترطيب التمور على طريقة البخار في 60اثبتت نتائج ناجعة كما كان متوقع مع المحافضة على استقرار المكونات الغذائية. طريقة معالجة التمور بترطيبها هي طريقة متصوح بهالكنها غير ناجة للتمور الأكثر جفافا التي تحتاج تطوير في هذه التقنية
Belbahi, Amine. "Étude et modélisation d'un traitement thermique suivi d'un conditionnement (température, aw et CO2) pour la maîtrise de la flore fongique d’altération des dattes à humidité intermédiaire." Thesis, Montpellier, SupAgro, 2015. http://www.theses.fr/2015NSAM0032.
Full textThe Deglet-Nour date is traditionally harvested and consumed at full ripeness stage (Tamar) characterized by a reduced water activity (aw<0.76). This date is stable under ambient storage conditions. In contrast, unripe Deglet-Nour (Routab stage) has interesting organoleptic properties, but is prone to microbial contamination due to its intermediate water activity levels (aw = 0.80−0.85). On the one hand, this work focused on the reduction of the initial microbial load by post-harvest surface heat treatment operation and, on the other hand, extending the shelf life of the dates by the inhibition of fungal growth using three environmental factors: temperature, aw and CO2-enriched atmosphere (modified atmosphere packaging). The fungal strains initially present on the Deglet-Nour dates surface were isolated from three districts in Algeria (Biskra, Tolga and Doucen). These strains were identified at the molecular level as Aspergillus niger, Alternaria alternata and Candida apicola. The fungal load ranged from 2.4 to 5.8 10^2 CFU/g. A thermal inactivation model for these strains was developed. Decimal reduction times at 50°C (D_50) were 22,1 ± 2,1 min and 2.3 ± 0.4 min for A. niger and C. apicola, respectively. The z-values were 9.6 ± 0.1°C and 9.4 ± 2.6°C for A. niger and C. apicola, respectively. This kinetic model was validated in unsteady heat treatment conditions. In parallel, a 2D axial-symmetric model of heat transfer was designed and solved by the finite element method. It takes into account the various sub-domains of date (pulp, air layer and pit) and assesses the yeast inactivation rate and the impact on quality. These data allowed for streamlining pasteurization schedules on dates surface. The effect of temperature (10−40°C), aw (0.993−0.818) and CO2 concentrations (9.4-55.1%, V/V) on the growth rates of Asp. niger and Alt. alternata have been quantified and modeled using the two-phase linear model and the γ-concept. The boundary between growth/no-growth was predicted using a deterministic approach and the model performance evaluation was conducted on pasteurized date past. A significant effect of the environmental factors on the growth of both strains has been found. Asp. niger displayed a faster growth rate and higher tolerance to low aw than Alt. alternata, which in turn proved more resistant to CO2 concentration and low temperature (respectively for Asp. niger and Alt. alternata: µ_opt = 28.6 and 12.1 mm day^–1; aw_min= 0.786 and 0.808; CO2_max= 79.8 and 95.1% ; T_min = 4.4°C and 1.6°C). The γ-concept model overestimated growth rates on date past; however, it is optimistic and provides somewhat conservative predictions. This study highlights the benefit of heat treatment to pasteurize dates surface while minimizing the color date degradation. In addition, the inhibitory effect of CO2 on the growth of both molds is very efficient, and CO2-enriched atmosphere seems relevant for the preservation of unripe dates
Belarbi, Abla. "Stabilisation par séchage et qualité de la datte Deglet-Nour." Massy, ENSIA, 2001. http://www.theses.fr/2001EIAA0114.
Full textBen, Lalli Ameziane. "Étude et modélisation de la désinfestation de la datte : analyse du couplage entre transferts thermiques et mortalité des insectes." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20013.
Full textDate fruits are subject to major attacks by insect pests. Fumigation with toxic gases is the classic and effective response to insect infestation, but it is neither environmentally friendly nor compatible with organic date certification. Alternative forms of disinfestation by thermal processes are therefore considered. The present work aims to develop experimental and modelling approaches to evaluate the impact of heat transfer (convection and electromagnetic waves) on the disinfestation of dates, while limiting browning. To achieve this, a breeding population of insects (Ephestia kuehniella Zeller) was established and a database of survival rate of eggs and larvae between 46 °C and 75 °C constructed. The two kinetic models selected (first order for eggs and a Weibull distribution for larvae) accurately describe insect survival according to their thermal history. In parallel, a 2D axis-symmetric numerical model of energy transfer was designed and solved by the finite element method (Comsol). It takes into account the various parts of a date fruit (pulp, air layer and pit) and the position of an insect in the fruit. The dielectric properties of insects and date fruit were measured and used in the model in order to simulate the coupling between the energy transfer, the survival rate of larvae located in the air layer (between pulp and pit), that of eggs on the date surface, and their interactions during heating and cooling. Achieving a low survival rate of larvae is the limiting factor for disinfestation by convection, whereas in contrast, the survival rate of eggs becomes the limiting factor for treatment by electromagnetic waves. Due to their high specific surface area, the eggs do not become hot enough to die during microwave treatment (915 MHz) at an electric field . Disinfestation by microwaves is therefore only of interest if associated simultaneously or sequentially with a surface treatment using a hot fluid (air, liquid, vapour). In contrast, an intense convective transfer (with liquid) used alone may lead to unacceptable surface browning. A microwave treatment (1 290 V m-1) associated with moderate ventilation (20 W m-2 K-1) with hot air (60 °C) for 180 s achieves an insect survival rate of 0.01% while limiting surface browning. However, this combined operation is only effective if the water content of dates is homogeneous. Indeed, the dielectric loss factor of date pulp depends strongly on water content
Nancib, Ayacha. "Production d'acide lactique par Lactobacillus casei subsp. rhamnosus sur jus de datte : cinétique et optimisation en cultures discontinues, semi-continues et continues." Thesis, Vandoeuvre-les-Nancy, INPL, 2007. http://www.theses.fr/2007INPL074N/document.
Full textThe aim of this work was to develop an efficient process of lactic acid production by Lactobacillus casei subsp. rhamnosus on date juice In a first part, the batch cultures were realized to carry out the nutritional requirement of the strain. These studies allowed us to describe the effects of carbon substrates, nitrogen substrates and vitamins on the lactic acid production. We showed that ammonium sulphate is a satisfying economic alternative and we have determined feasibility of minimizing the addition of the yeast extract by the partial use of yeast extract combined with the ammonium sulphate plus the addition of vitamins of the group B. Pure and mixed cultures of Lactobacillus casei and Lactococcus lactis were carried out. The mixed system gives better results concerning the lactic acid production and the use of the sugars compared with those obtained in pure cultures of Lactobacillus casei or Lactococcus lactis. The effect of pure sugars (glucose and fructose) and mixed sugars (glucose/fructose) on the lactic acid production was studied. The lactic acid production is more important on mixed sugars than on pure sugars what explains the performances of fermentation on date juice. In a second part, a mode of fed batch operations was defined to improve the performances of the fermentation. The two factors influencing the process are the feeding rate and the concentration of the feeding medium. In a third part, kinetic study in continuous culture was developed. We studied the influence of dilution rate on growth, substrate utilization and lactic acid production. The productivity of the continuous process was considerably increased in comparison with the batch process. Finally, a tentative model has been established for the fermentation process. The corresponding model, although not perfect, is apparently able to simulate growth rate, substrates uptake and lactic acid production in batch culture
Mann, David F., Henri D. Grissino-Mayer, Charles H. Faulkner, and John B. Rehder. "From Blockhouse To Hog House: The Historical Dendroarchaeology Of The Swaggerty Blockhouse, Cocke County, Tennessee, U.S.A." Tree-Ring Society, 2009. http://hdl.handle.net/10150/622600.
Full textYupanqui, Trujillo Claudia, Iturrizaga Renzo Condor, and Rentería Fátima Uceda. "Recursos de información para el programa de Educación." Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/625459.
Full textLesaoana, 'Maseka A. "Scheduling with fixed delivery dates." Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358925.
Full textMichel-Dansac, Fanny. "L'iconographie du palmier dans la Méditerranée antique : diffusion et sens du motif." Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10107.
Full textThe pattern of the palm-tree, which appears as soon as the end of the IVth millennium BC in both Egypt and Mesopotamia, experiences a vast diffusion across the Ancient Mediterranean world during the IInd and Ist millennium BC. Its style situates it in the artistic, cultural, and religious tradition of a large number of regions: the Levant, Cyprus island, Ancient Greece, and the Western Mediterranean. This thesis, built on wide geographical and chronological fields of study, investigates the geographical distribution of the pattern arising from contacts and exchanges between various civilizations and highlights how a specific iconography, proper to each civilization, has been elaborated. Some symbolic developments, such as the religious aspect of the palm-tree and the connection or assimilation of the tree to humans, in particular to women, appear recurrent and allow one to address the question of the continuity of the pattern in various picture samples and the way the view of the tree manifests itself in each of these civilizations
Fan, Rong. "Recognition of dates handwritten on cheques." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ39986.pdf.
Full textGoemans, Michel X., Maurice Queyranne, Andreas S. Schulz, Martin Skutella, and Yaoguang Wang. "Single Machine Scheduling with Release Dates." Massachusetts Institute of Technology, Operations Research Center, 1999. http://hdl.handle.net/1721.1/5211.
Full textAhmed, Imad Ali. "Aflotoxins on dates (Phoenix dactylifera L.)." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262576.
Full textNoirot, Renaud. "Les dates de naissance des créances." Thesis, Paris 5, 2013. http://www.theses.fr/2013PA05D016/document.
Full textIt is the laws governing companies experiencing difficulties which have revealed the complexity of determining the dates of the origination of the claims. And yet this appears to be fundamental in private law. As it constitutes the criterion for implementing certain legal mechanisms, it epitomizes the existence of the claim and hence represents a challenge for any rule of law in which the existence of this claim is a goal or condition. There are two conflicting doctrinal currents: the traditional approach sets the date of origination at the stage of the formation of the contract, while modern approaches situate it at the stage of the execution of the contract. The materialistic approach, based on the law governing companies experiencing difficulties, staggers the origination of the price debt over the period of the execution of the service. The periodical approach, which relies on a doctrinal reflection on successive execution contracts, is that of the re-origination of all the claims under the contract at each contractual period. An examination of the modern approaches, under the auspices of the legal mechanisms which can only epitomize the true date of origination of the authentic claim leads to the invalidity thereof. The traditional approach is therefore once again consecrated. But the resistance constituted by the laws governing companies in difficulty cannot rely on the technique of legal fiction, because other manifestations of the same phenomenon can be identified outside this domain. Therefore, a change of paradigm is in order if the hiatus is to be resolved. Behind this persistent phenomenon lies in fact another vision, another concept of the claim: the economic claim which, interwoven with the legal claim in the private law system, supplements it. The duality of the dates of origination therefore conceals in its bosom the duality of the very concept of a claim, the traditional legal claim and the economic claim. The economic claim is not a subjective personal right. It is not a legal claim. It is not autonomous of the legal claim and must not be confused with a claim originating in a case of unwarranted enrichment. The economic claim represents the value produced by the contract as the service which characterizes it is provided. It permits the rectification of the ordinary application of the concept of legal claim by ensuring the function of correlating the proceeds with the costs of a commodity or an activity. Its domains of application are varied. In addition to its use in accounting and fiscal law, the economic claim permits the determination of the portion transferred in the context of the transfer of a contract, the determination of the collateral consisting in a special-purpose fund in the context of a legal joint estate, a limited liability individual contractor or a trust, as well as the determination of the liabilities which escape the discipline of collective proceedings. In these domains, it is therefore not the date of origination of the legal claim which applies, but the date of origination of the economic claim. The coherence of the private law system is therefore restored as concerns the date of the origination of the claim
McGinley, Susan. "Developing Nitrogen Application Guidelines for Medjool Dates." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010. http://hdl.handle.net/10150/622073.
Full textOttman, Michael J. "Planting Dates for Small Grains in Arizona." College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/555994.
Full text3 pp.
Planting at the optimum time is probably the most important cultural practice in producing high small grain yields. Wheat and barley crops that are planted too early or too late have lower yield potential no matter how they are grown after planting. However, small grains are sometimes planted later than optimum when grown in rotation with cotton or vegetables due to harvest timing in these crops. Therefore, the entire farm enterprise should be considered when deciding on a planting date for small grains.
Ottman, Michael. "Planting Dates for Small Grains in Arizona." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/146996.
Full textChambers, Cynthia R., and Eva M. Horn. "Strategies for Family Facilitation of Play Dates." Digital Commons @ East Tennessee State University, 2010. https://dc.etsu.edu/etsu-works/3855.
Full textCuervo, Maria Cristina. "Datives at large." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/7991.
Full textIncludes bibliographical references (p. 206-211).
This dissertation is a study of the syntactic and semantic properties of dative arguments. The main source of data is Spanish, where dative arguments can appear with all types of verbs, and can have a wide range of meanings: goal, possessor, source, experiencer, affected object, causee, location, benefactive, malefactive, ethical dative. The challenge for a theory of dative arguments, which form a natural class morphologically, is to explain both what they have in common and how they differ syntactically and semantically. I argue that dative arguments have structural meanings, i.e., the meaning of a dative DP can be derived directly from the position in which it is licensed. To be able to predict the possible meanings of dative arguments, it is crucial to take into account the details of the syntactic configuration, which include the properties of the head that licenses the dative DP and of the functional heads that construct the event structure. Dative arguments are not direct arguments of the verb; they are, like subjects, licensed syntactically and semantically by a specialized head. This argument introducing head, the Applicative, licenses the dative DP as its specifier and relates this DP to the structure it takes as a complement. The range of possible meanings of a dative DP is predicted from the range of possible complements an applicative head can take (i.e. a DP or a vP), and from the range of heads that the applicative phrase can be a complement of. Applicative heads are also sensitive to the type of event expressed by the vP (e.g., dynamic or stative, activity or causative). The theory provides a set of positions into which an applicative head can merge and license an argument DP, as well as the set of interpretations the argument can get in each position.
(cont.) The set of positions is universal, but languages can differ with respect to the positions into which an applicative head is allowed to merge. These predictions generalize to applied arguments in languages in which they are not marked by dative case (e.g., English and Bantu languages).
by María Cristina Cuervo.
Ph.D.
Forti, Rubio Bianca María, Constantini Aldo Ramiro Gavidia, Venegas Marcelo Hernandez, Bazán Keyla Isbeth Mori, and Blascano Yanira Arlet Zeña. "DATEA." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/656952.
Full textThis report has been prepared with the purpose of developing the integral plan of our business idea. Throughout this report and after having presented the brief description of the idea we chose, the following topics will be described: Design and development of the Business Model Canvas; where we identify the profile of our client. In addition, we develop the value map, together with the description of our value proposition and the differentiating elements compared to the competition. Then we move on to the development and validation of all the quadrants of the BMC; where several experiments were used that helped us to support all the quadrants. Next, we will proceed to explain all the marketing mix plan, where we will talk about producto, Price, placement, promotion and Fidelity, especifically for the developing idea. Followed by the financial plan, where the sales proyection, investment Budget, income and expenses, cashflow, NPV and financing will be detailed. Finally, we concluded the work with the conclusions and recommendations of all the topics, which have been agreed at the level of the whole group and have been of great help to be able to continue with the development and improvement of our business idea.
Trabajo de investigación
Seddik, Yasmina. "Ordonnancement avec dates de livraison et gains cumulatifs." Paris 6, 2012. http://www.theses.fr/2012PA066640.
Full textStarting from a real world digitization workflow issue, we identified a scheduling problem with a new criterion involving common delivery dates for the jobs. In order to focus on this new criterion and on the jobs' release dates, we mainly worked on a single machine problem. We delimited the complexity classes of the problem, and provided a Branch and Bound algorithm for the general problem, based on dedicated bounds and dominance rules. We also considered the weakly NP-hard problem with two delivery dates, for which we designed a pseudopolynomial dynamic programming algorithm and an approximation algorithm with an absolute performance guarantee of 1. Finally, in order to consider a problem more closely related to the industrial issue, we studied a permutation flowshop problem with the same criterion. For this problem, we proposed several heuristic methods: constructive algorithms, local search, and a GRASP algorithm. All the algorithms were implemented. In particular the Branch and Bound method for the single machine problem and the local search algorithms for the flowshop provide good solutions in a reasonable time
Salma, Mohammad. "Utilisation de la cryoconservation pour la conservation et la production de cultures in vitro de palmier dattier (Phoenix dactylifera L.) : Impact d'un protocole de cryoconservation sur la physiologie des cals embryogènes de palmier dattier." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS179/document.
Full textThe date palm (Phoenix dactylifera. L) has a great ecological and socioeconomic importance in arid and semi-arid areas of the globe. This species displays a great diversity, with over 2,000 identified varieties, which is threatened by the large scale production of elite varieties. It is necessary to develop techniques allowing to conserve this biodiversity and to manage the production of in vitro propagated elite varieties. Cryopreservation (liquid nitrogen [LN], -196°C) is currently the only technique available ensuring the safe and cost-effective long-term conservation of this diversity. In this work, we compared the efficiency of two cryopreservation techniques, droplet-vitrification (DV) and D cryo-plate (DP), for the cryopreservation of proembryonic masses (PEMs) of two varieties of date palm, Sokary and Sultany. With DV, recovery of cryopreserved PEMs was nil without sucrose pretreatment (3 days, 0.5 M) and without treatment with PVS2 vitrification solution. After 15 to 120 min of PVS2 treatment, recovery was between 90.9-98.6% and 85.6-88.0% for Sokary and Sultany, respectively. Sucrose pretreatment led to 21.1% recovery of cryopreserved PEMs of variety Sokary without PVS2 treatment. Regrowth intensity of PEMs cryopreserved was generally lower in the Sultany variety compared to the Sokary variety. With DP, a positive effect of sucrose pretreatment on recovery of cryopreserved PEMs was observed. For Sokary, the highest recovery of PEMs (92.0 to 95.8%) after LN exposure was achieved for desiccation periods between 60 and 120 min. Recovery of cryopreserved PEMs of variety Sultany was between 67.0 and 74.6% after desiccation periods between 90-120 min. With DP, the regrowth intensity of cryopreserved PEMs was higher for variety Sokary compared to Sultany. The histological study performed showed that in absence of pretreatment, it was the loading treatment which induced the highest cell plasmolysis, with values of 26, 40 and 50% for meristematic, embryogenic PopI and PopII cells, respectively, compared to their initial state. Sucrose pretreatment induced a 50% plasmolysis only in PopII cells. The loading and vitrification treatments did not cause any additional plasmolysis. No plasmolysis was observed in meristematic or PopI cells. By contrast, the measurement of the surface of all cells revealed a significant decrease in the surface of meristematic cells after pretreatment, but no significant difference after the loading or vitrification treatments. In embryogenic PopI cells, an additional decrease in the cell surface was observed after the PVS2 treatment. The study of nuclei circularity showed a permanent deformation of nuclei of non-pretreated cells of the three cell types. In pretreated PEMs, only the nuclei of PopII cells displayed deformation. Finally, the study of the methylation degree in PEMs by immunolocalization revealed the absence of significant differences between the untreated controls and other experimental conditions. However, the differentiated tissues exhibited a higher percentage of methylated nuclei compared to embryogenic cells, while no stained nuclei were observed in meristematic cells. Our results allowed clarifying the effect of cryopreservation on the structural integrity and on the physiology of date palm PEMs. They also contribute to safeguarding of date palm biodiversity
Gomes, Juliane Dominoni. "Separações conjugais em datas comemorativas." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=5142.
Full textConselho Nacional de Desenvolvimento Científico e Tecnológico
Visando apontar as vicissitudes que possam estar relacionadas ao fato de alguns rompimentos conjugais ocorrerem em datas comemorativas foi produzida a dissertação. O tema surgiu em pesquisas sobre separação conjugal e guarda de filhos do Instituto de Psicologia da Universidade do Estado do Rio de Janeiro, nas quais se observou que as dissoluções que ocorreram nas datas festivas eram relevantes. Foram desenvolvidas análises bibliográficas sobre casamento, dissolução da conjugalidade, comemorações, memórias e rituais. Devido à interdisciplinaridade da temática realizou-se estudos em Psicologia, Antropologia, Direito, História e Sociologia. Pretendeu-se verificar quais os sentidos atribuídos pelos ex-cônjuges à data comemorativa na qual ocorreu a separação. Buscou-se constatar se houve alteração ou reconfiguração do significado das datas após o rompimento e visou-se apresentar reflexões que possam auxiliar a prática clínica e jurídica, mediante a atuação do profissional psicólogo nas questões tangentes à separação conjugal. A metodologia utilizada foi de História de Oral História de vida. Foram entrevistados quatro sujeitos, um rapaz que tomou a iniciativa no seu aniversário, uma moça que anunciou a decisão no aniversário de vinte seis anos de casamento, uma mulher que recebeu a notícia no Natal e um homem que foi comunicado no Ano Novo. Todos são do Estado do Rio de Janeiro e de classe média. A partir do discurso foi realizada a análise qualitativa dos dados, classificando-se as respostas em categorias essenciais à pesquisa. Como resultados verificou-se, no que se refere às datas comemorativas, que os entrevistados vivenciaram esses momentos como se estas possuíssem algo de mágico. Como se nestas épocas todos os problemas pudessem ser colocados de lado e tréguas pudessem ser feitas. Entretanto, os relatos mostraram que a tal mágica não ocorreu, as dificuldades continuaram expostas e, pelo contrário, o clima do evento evidenciou as convergências ficando difícil progredir como se nada estivesse acontecendo. Os sujeitos que tiveram a iniciativa em terminar com o relacionamento afirmaram que as datas das bodas de casamento e o aniversário natalício deram força e coragem que não tinham tido até aquele momento. Este ato favoreceu a sensação de realização e conquista que, no entanto, vinham misturada de dor, frustração e mágoa. Os sujeitos que receberam o comunicado da decisão do rompimento do casamento no Natal e no Réveillon reconheceram que a noticia configurou-se numa surpresa impactante, ao ponto de provocar silêncio. Identificou-se que não houve reconfiguração nos sentidos atribuídos às datas comemorativas, ao contrário o rompimento nestes eventos sociais fortaleceram o acontecimento. No entanto, foi possível perceber uma adição ao calendário oficial. O Natal, o Réveillon, as bodas e o aniversário é, também, o dia do rompimento conjugal. Soma-se marcos e fortifica-se o evento na memória dos sujeitos que vivenciaram estas histórias. Dentre as contribuições para a prática da Psicologia Jurídica e da clínica evidenciou-se que estes profissionais devem estar atentos ao caráter cíclico das festividades que estão nos calendários, configurando-se em momentos de transição, de inícios e fins.
The thesis has been elaborated having an objective to underline the vicissitudes which may refer to the fact of some conjugal breaking-offs taken place on the commemorative dates. The topic resulted from researches of the Institute of Psychology of the State Rio de Janeiro in respect of conjugal dissolution and guardianship of children. Through the said research it has been observed that dissolutions which occurred on festive dates were relevant in this regard. There have been conducted certain bibliographical analyses on marriage, conjugal dissolution, commemorations, remembrances and rituals. Due to correlation with other subjects certain study has been realized on such disciplines as Psychology, Anthropology, Civil Law, History and Sociology. It has been an intention to verify meanings attributed by ex-husband and ex-wife to the commemorative date on which the dissolution occurred. The research has been made to ascertain whether there has been alteration or reconfiguration of the date meanings after the dissolution event with a purpose to present certain reflections which may contribute to clinical and juridical practice through the performance of the professional psychologist within the areas related to the issues on conjugal dissolution. The methodology of Oral History Life History has been applied. Four persons have been interviewed: a guy, who took initiative on his birthday, a girl who announced the decision on her twenty sixth wedding anniversary, a woman who received such news on Christmas day and a man who was communicated that information on the New Years Day. They all are from the State Rio de Janeiro and are representatives of the media class. The qualitative data analysis has been made to classify responses into essential categories to align with the research. As far as commemorative dates are concerned, it has been verified that interviewees experienced those moments in such a way as if those moments were of some magical nature. As if at that time all the problems could have been put aside and a truce could have been concluded. However, results have demonstrated that such magic did not occur and problems continued to exist, and on the contrary, the climate of the event proved that it was difficult for convergence to progress as if nothing has happened. Those persons who took an initiative to terminate the relationships confirmed that the dates of wedding anniversary and birthdays gave them such a strength and courage which they have not had before that moment. This action has favoured to the sensation of an ability to realize and explore being, however, mixed with pain, frustration and misfortune. Those persons who received the information about conjugal dissolution on the Christmas and New Years Days expressed that such information turned to have an effect of surprise causing a moment of silence. It has been identified that there were no reconfiguration in the meanings attributed to the commemorative dates, on the contrary, the breaking-off on such social events have strengthen the occasion. However, this made possible to perceive an appearance of the additional official date to the calendar. Christmas, New Years Day, birthday and anniversary, in addition are also date of conjugal dissolution. Such event is fortified in the memories of those persons who have experienced these occasions. Among contributions to the practice of the Juridical Psychology and of the clinical one, evidenciou - in case that than it is to these professionals must be advertent to the character cíclico of the festivities than it is to they are at the calendars , configuring - in case that well into moments transitional , as of starts AND fins.
Di, Mauro Yuri. "Progetto di una calibratrice per l'industria alimentare." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Find full textMorita, Marisa Emika. "Automatic recognition of handwritten dates on brazilian bank cheques." Mémoire, Montréal : École de technologie supérieure, 2003. http://wwwlib.umi.com/cr/etsmtl/fullcit?pNQ85288.
Full text"Thesis presented to the École de technologie supérieure in partial fulfillment of the thesis requirement for the degree of philosophiae doctor in engineering". La numérotation de cet ouvrage est erronée. Bibliogr.: f. [158]-170. Également disponible en version électronique.
Ismail, Baraem. "Dates : physico-chemical characteristics, total quality and nutritional significance." Thesis, University of Central Lancashire, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275924.
Full textSwetnam, Thomas W., William E. Wright, Anthony C. Caprio, Peter M. Brown, and Christopher H. Baisan. "Fire Scar Dates from Walnut Canyon National Monument, Arizona." Laboratory of Tree-Ring Research, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/302624.
Full textEighteen samples of fire-scarred ponderosa pine (Pinus ponderosa Laws.) from Walnut Canyon National Monument (Fig. 1) were delivered to the Laboratory of Tree-Ring Research in September 1989. These partial cross section samples were prepared and dendrochronologically dated. This report contains a brief description of the methods used in this project, and a detailed listing of the dating results. Some preliminary observations of the character of fire history are offered.
Vila, Cynthia. "Política de datos abiertos y protección de datos personales." Universidad Peruana de Ciencias Aplicadas (UPC), 2017. http://hdl.handle.net/10757/622299.
Full textResumen
Erpen, Lígia. "Modelagem do desenvolvimento e produtividade de batata-doce." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/5093.
Full textThe objectives of this dissertation were to determine the cardinal temperatures of sweet potato and compare the simulation of node appearance with the plastochron model (linear) and with Wang and Engel model (nonlinear) and the best way input air temperature in the models and to assess the effect of planting dates on tuber initiation and storage root yield of sweet potato in a subtropical environment. Models calibration and the test were with data of number of nodes on the main stem of sweet potato plants, collected at seven planting dates in 2010, 2011 and 2012 growing seasons. The tuber initiation and storage root yield were assessed in an experiment with four planting dates in 2011 and 2012 growing seasons. The experiments were conducted in the experimental area of the Department of Plant Science, UFSM, Santa Maria, RS, with cultivar Princesa at planting density of de 25.000 plants ha-1. The experiment was a complete randomized block design with four replications. The version with mean temperature was superior to the version with the minimum and maximum temperature as input in both models. The plastochron and Wang and Engel models showed similar performance, with RMSE ranging from 2.1 to 2.2 nodes respectively. Both models can be used to simulate the development of sweet potatoes when it is cultivated in the recommended period. Outside this period is suggested to use the model of Wang and Engel. The conditions of temperature and photoperiod modified the tuber initiation in each planting date, indicating that short photoperiods accelerate its occurrence. The storage root yield was higher when planting was done in late winter due to the longer duration of tuber bulking which coincided with periods of high solar radiation and temperatures favorable to the growth and development of sweet potato. Keywords: Ipomoea batatas. Phenology. Modeling. Planting dates.
Os objetivos desta dissertação foram determinar as temperaturas cardinais da batata-doce e comparar a simulação da emissão de nós com o modelo do plastocrono (linear) e com o modelo de Wang e Engel (não linear) e a melhor forma de entrada da temperatura do ar nos modelos e avaliar o efeito de diferentes datas de plantio no início de tuberização e produtividade de raízes tuberosas de batata-doce em ambiente subtropical. A calibração e o teste dos modelos foram feitos através de dados de número de nós na haste principal de plantas de batata-doce, coletados em sete datas de plantio nos anos 2010, 2011 e 2012. O início de tuberização e a produtividade foram avaliados em um experimento com quatro datas de plantio em 2011 e 2012. Os experimentos foram conduzidos na área experimental do Departamento de Fitotecnia da UFSM, Santa Maria, RS, com a cultivar Princesa na densidade de plantio de 25.000 plantas ha-1. O delineamento experimental foi blocos ao acaso com quatro repetições. Melhor predição dos modelos foi obtida com o uso das temperaturas cardinais 12 °C, 30 °C e 40 °C. A versão da temperatura média diária do ar foi superior a temperatura mínima e máxima diária do ar em ambos os modelos. Os modelos plastocrono e Wang e Engel apresentaram desempenho semelhante, com a RQME variando de 2,1 a 2,2 nós respectivamente. Os dois modelos podem ser utilizados para simular o desenvolvimento vegetativo da batata-doce quando cultivada na época recomendada. Fora desse período sugere-se usar o modelo de Wang e Engel. As condições de temperatura e fotoperíodo modificaram o início de tuberização em cada data de plantio, indicando que fotoperíodos curtos aceleram sua ocorrência. A produtividade de raízes tuberosas foi maior quando o plantio foi realizado no final do inverno, em decorrência da maior duração da fase de acumulação de amido, que coincidiu com os períodos de alta radiação solar incidente e temperaturas favoráveis ao crescimento e desenvolvimento da batata-doce.
Gros-Balthazard, Muriel. "Sur les origines, l'histoire évolutive et biogéographique du palmier-dattier (Phoenix dactylifera L.) : l'apport de la génétique et de la morphométrie." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20230/document.
Full textThe objectives of this work are to understand the evolutionary history and biogeography of the date palm (Phoenix dactylifera L.), a species of importance to human populations in hot, arid regions of North Africa and the Middle East using genetic and morphometric analyzes. Indeed, the origins of the domestication of the date palm remain poorly understood despite the archaeological data that seem to attest its culture from the late 4th millennium BCE.Phylogenetic analysis of the genus Phoenix made from chloroplast sequences identified close relatives of the date palm. Populations of wild date palms are recognized for the first time through analyses of genetic diversity and structure. Congruently, morphometric analysis of the seed outline based on the method of elliptic Fourier transform highlights a clear differentiation between wild and cultivated individuals. Characterization of changes in seed morphological traits related to domestication is used to define the status of wild or domesticated material excavated from various archaeological sites in Pakistan and Egypt. In addition, the date palm genetic study of various origins seems to indicate that at least two domestication events took place: one in Africa and one in the Middle East. Finally, genetic and morphometric studies, conducted separately or together depending on the type and age of the material analyzed, allow for the first time to discuss the origins, history and biogeographic dynamics of date palm agrobiodiversity, in time and space
Dathe, Henning. "Der elastisch aufgehängte starre Körper." [S.l.] : [s.n.], 2001. http://webdoc.sub.gwdg.de/diss/2002/dathe/dathe.pdf.
Full textGogłoza, Aleksandra. "Polish Datives - an Applicative Analysis." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22596.
Full textThis thesis focuses on the relative syntactic position of Polish inherent datives. In semantic terms, we propose that all dative-marked arguments in Polish de- note an entity mentally affected by a change, state or process which takes place within the personal sphere of the entity lexicalised as a dative DP. In syntactic terms, we propose that Polish dative DPs are applicatives, licensed by an Appl head, and that they come in two types, low and high, depend- ing on their syntactic position. Low applicatives merge below v while high applicatives merge above it. The merge position of an applicative determines its syntactic behaviour. In contrast to low applicatives, high applicatives can antecede anaphors, control adjunct participial clauses and depictive secondary predicates. We propose that these differences constitute reliable diagnostics for applicative types in Polish. With these tests, we analyse Polish recipients and benefactives as low applicatives and Polish experiencers as high applicatives. Moreover, we distinguish between applicatives that are free, e.g. benefactives in Polish, and those that are selected, e.g. Polish recipients. Applicatives selected by the verb merge first as part of v or the root, and they become applicatives on movement to [Spec;ApplP]. In contrast, non-selected applicatives merge directly in [Spec;ApplP], i.e. they are born as applicatives. We propose a participant im- plication test to differentiate between these two types. Moreover, extending the analysis beyond Polish data, we hypothesise that cross-linguistically, there exist two types of applicatives, verb-internal, projected as part of vP / VP, and verb-external, projected as part of ApplP. We take Polish datives to be of the latter type.
Tawhid, Aslam. "Effects of Soybean Cultivars and Planting Dates on Biomass Production." TopSCHOLAR®, 1994. http://digitalcommons.wku.edu/theses/952.
Full textVos, Sarah Cornelia. "GETTING TO 40 WEEKS: CONSTRUCTING THE UNCERTAINTY OF DUE DATES." UKnowledge, 2012. http://uknowledge.uky.edu/comm_etds/2.
Full textAris-Brosou, Stephane. "Bayesian molecular phylogenetics : estimation of divergence dates and hypothesis testing." Thesis, University College London (University of London), 2002. http://discovery.ucl.ac.uk/1317866/.
Full textGhelawi, Mohamed Ali. "A physico-chemical analysis of irradiated dates (Phoenix dactylifera L.)." Thesis, University of Salford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360402.
Full textSrivastava, Rajiv K. "Optimal part delivery dates in small lot stochastic assembly systems." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54433.
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AHLSTROM, RICHARD VAN NESS. "THE INTERPRETATION OF ARCHAEOLOGICAL TREE-RING DATES (SOUTHWEST, DENDROCHRONOLOGY, PREHISTORY)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188084.
Full textKittock, David L., B. Brooks Taylor, Ron Cluff, Max Thatcher, Joel Malcuit, and Carl Michaud. "Upland and Pima Cotton Planting Rates and Dates at Safford." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/203917.
Full textFarr, Charles. "Lint Yield of Planting Pima S-6 at Three Dates." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/204534.
Full textBENSOUDA, M. OUSSAMA. "Composition chimique et proprietes nutritionnelles de la datte phoenix dactylifera." Strasbourg 1, 1991. http://www.theses.fr/1991STR15060.
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