Letteratura scientifica selezionata sul tema "Crop Corps"
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Articoli di riviste sul tema "Crop Corps"
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Zhai, Jiawei, Bin Luo, Aixue Li, Hongtu Dong, Xiaotong Jin e Xiaodong Wang. "Unlocking All-Solid Ion Selective Electrodes: Prospects in Crop Detection". Sensors 22, n. 15 (25 luglio 2022): 5541. http://dx.doi.org/10.3390/s22155541.
Testo completoAbstract (sommario):
This paper reviews the development of all-solid-state ion-selective electrodes (ASSISEs) for agricultural crop detection. Both nutrient ions and heavy metal ions inside and outside the plant have a significant influence on crop growth. This review begins with the detection principle of ASSISEs. The second section introduces the key characteristics of ASSISE and demonstrates its feasibility in crop detection based on previous research. The third section considers the development of ASSISEs in the detection of corps internally and externally (e.g., crop nutrition, heavy metal pollution, soil salinization, N enrichment, and sensor miniaturization, etc.) and discusses the interference of the test environment. The suggestions and conclusions discussed in this paper may provide the foundation for additional research into ion detection for crops.
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Zheng, Kang, Xueguan Zhao, Changjie Han, Yakai He, Changyuan Zhai e Chunjiang Zhao. "Design and Experiment of an Automatic Row-Oriented Spraying System Based on Machine Vision for Early-Stage Maize Corps". Agriculture 13, n. 3 (16 marzo 2023): 691. http://dx.doi.org/10.3390/agriculture13030691.
Testo completoAbstract (sommario):
Spraying pesticides using row alignment in the maize seedling stage can effectively improve pesticide utilization and protect the ecological environment. Therefore, this study extracts a guidance line for maize crops using machine vision and develops an automatic row-oriented control system based on a high-clearance sprayer. First, the feature points of crop rows are extracted using a vertical projection method. Second, the candidate crop rows are obtained using a Hough transform, and two auxiliary line extraction methods for crop rows based on the slope feature outlier algorithm are proposed. Then, the guidance line of the crop rows is fitted using a tangent formula. To greatly improve the robustness of the vision algorithm, a Kalman filter is used to estimate and optimize the guidance line to obtain the guidance parameters. Finally, a visual row-oriented spraying platform based on autonomous navigation is built, and the row alignment accuracy and spraying performance are tested. The experimental results showed that, when autonomous navigation is turned on, the average algorithm time consumption of guidance line detection is 42 ms, the optimal recognition accuracy is 93.3%, the average deviation error of simulated crop rows is 3.2 cm and that of field crop rows is 4.36 cm. The test results meet the requirements of an automatic row-oriented control system, and it was found that the accuracy of row alignment decreased with increasing vehicle speed. The innovative spray performance test found that compared with the traditional spray, the inter-row pesticide savings were 20.4% and 11.4% overall, and the application performance was significantly improved.
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Stanley, Sally M. "California Conservation Corps offers youth career development opportunities". California Agriculture 56, n. 2 (marzo 2002): 61–64. http://dx.doi.org/10.3733/ca.v056n02p61.
Testo completo
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Holt, Marilyn Irvin. "On the Farm Front with the Victory Farm Volunteers". Agricultural History 96, n. 1-2 (1 maggio 2022): 164–86. http://dx.doi.org/10.1215/00021482-9619828.
Testo completoAbstract (sommario):
Abstract During World War II, American agriculture grappled with labor shortages while being expected to produce more for the military and the home front. Historians have studied the use of labor sources such as migrant workers and the Women's Land Army during this time, but the Victory Farm Volunteers, a program of the federal US Crop Corps, have been largely overlooked, despite the numbers of urban youth who participated. This study examines the program as it was carried out in the states of the Great Plains, particularly its relationship to 4-H and its impact on farm production goals during the war and in the immediate postwar era.
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SHK, Suparman, Arsi, Bambang Gunawan, Abu Umayah, Yulia Pujiastuti e Harman Hamidson. "The Evaluation of Implementation of Integrated Pest and Disease Control by Farmers of Food and Holticultural Corps in Banyuasin and Ogan Komering Ulu Timur". Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam 20, n. 1 (30 giugno 2023): 63–71. http://dx.doi.org/10.31851/sainmatika.v20i1.11144.
Testo completoAbstract (sommario):
Reducing crop cultivation is providing ecological biota for plants through Integrated Pest Management (IPM). Farmers' problems regarding pests and diseases in Banyuasin and OKU Timur, especially for food crops and horticulture farmers. The purpose of this research is to evaluate the compliance of food crops and horticulture farmers in implementing safe and environmentally friendly IPM. Study on various fields of food and horticulture farmers in Banyuasin and Ogan Komering Ulu. The research method used is purposive sampling. Observation of Plant Pests and Diseases was completed directly in the field. Then determine the disease score in each sample plant. The parameters observed in this study are the behavior of farmers towards the decision-making process of using pesticides. Pest and disease intensity, and disease attack percentage were analyzed descriptively in the form of tables and graphs, as well as correlation analysis. The highest value of diversity of pests and diseases of food and horticultural crops based on the entire area of the observed land was found in a land area of 0.25 ha, which is the area that is often found in land for crop cultivation. The average age percentage of farmers in Banyuasin and OKU East is 40 to 50 years old. The average education of farmers in Banyuasin and OKU Timur is 24 farmers. The percentage and intensity of both horticultural and food crops in Banyuasin are good because only a few farmers get a score of 2 or 1. Cultivation techniques are land preparation, land sanitation, selection of resistant varieties, spacing, irrigation, crop rotation, intercropping, mulching, natural enemies of insects, and weeding.
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Rous, Jean-François. "De l’oléochimie à la bioraffinerie : continuité de développement pour le secteur des corps gras ?" OCL 23, n. 5 (1 luglio 2016): D506. http://dx.doi.org/10.1051/ocl/2016024.
Testo completo
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De Deyn, Gerlinde, Adriaan Van Aelst e Gerrit Karssen. "Scanning electron microscopical observations on the coastal marine nematode Epsilonema pustulatum (Gerlach, 1952) Lorenzen, 1973 (Nematoda: Epsilonematidae)". Nematology 2, n. 6 (2000): 685–93. http://dx.doi.org/10.1163/156854100509547.
Testo completoAbstract (sommario):
AbstractAdditional detailed morphological information on features of the marine nematode Epsilonema pustulatum is presented for the first time. Lip structure, amphideal fovea, cuticular appendages (setae, spines, anal and copulatory thorns), annules and vacuoles, body inversion, setae ambulatoriae region, vulva, cloaca/anus and tail end are SEM studied and illustrated. Additionally, E. pustulatum (from Spain, Italy and Lebanon) is compared with other former Bathyepsilonema species. E. anulosum (Verschelde & Vincx, 1992) is proposed as a junior synonym of E. pustulatum. Observations au microscope électronique à balayage sur le nématode marin côtier Epsilonema pustulatum (Gerlach, 1952) Lorenzen, 1973 (Nematoda: Epsilonematidae) - Des données morphologiques nouvelles concernant le nématode marin Epsilonema pustulatum sont présentées pour la première fois. Sont étudiés en microscopie électronique à balayage et illustrés des caractères tels que la structure labiale, les fovea amphidiales, les appendices cuticulaires (sétes, épines du corps, épines anales et copulatoires), anneaux et vacuoles, courbure du corps, région des sétes ambulatoires, vulve, cloaque/anus et extrémité de la queue. De plus, E. pustulatum (provenant d'Espagne, Italie et Liban) est comparé avec d'autres espèces auparavant placées dans le genre Bathyepsilonema. E. anulosum (Verschelde & Vincx, 1992) est proposé comme synonyme mineur d'E. pustulatum.
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Esnault, MA, A. Merceur e J. Citharel. "Biosynthèse des protéines de réserve et formation des corps protéiques dans la graine de lupin jaune (Lupinus luteus L, Légumineuses)". Agronomie 13, n. 4 (1993): 307–16. http://dx.doi.org/10.1051/agro:19930408.
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Yushin, Vladimir, e August Coomans. "Ultrastructure of sperm development in the free-living marine nematodes of the family Chromadoridae (Chromadorida: Chromadorina)". Nematology 2, n. 3 (2000): 285–96. http://dx.doi.org/10.1163/156854100509150.
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AbstractSpermatogenesis in two species of free-living marine nematodes from the family Chromadoridae (Panduripharynx pacifica and Euchromadora robusta) was studied electron-microscopically. The spermatogonia of both species are undifferentiated polygonal cells with a large nucleus surrounded by a small amount of cytoplasm. In P. pacifica the cytoplasm of spermatocytes contains many Golgi bodies, cisternae of RER, ribosomes, mitochondria and dense spherical bodies. Filamentous material is accumulated in spermatids, which contain only mitochondria and a fragmented (or lobed) nucleus devoid of the nuclear envelope. The immature sperm resembles the late spermatid: its central filamentous area is surrounded by chromatine particles and occasional mitochondria. The immature sperm plasma membrane forms deep infoldings. Mature spermatozoa from the uterus consist of a small main cell body (MCB) bearing a prominent pseudopod filled with cytoskeleton filaments. The MCB contains a nucleus and mitochondria. Spermatogenesis in E. robusta (studied only in testes) resembles that described for P. pacifica, but spermatocytes of E. robusta show much lower metabolic activity and, as a result, a smaller mass of filamentous material is stored in the spermatids and immature sperm. The spermatozoa of P. pacifica and the immature sperm of E. robusta have the main ultrastructural features characteristic for nematodes (amoeboid nature, absence of axoneme, acrosome and nuclear envelope). No aberrant organelles special for many nematode sperm (membranous organelles, paracrystalline fibrous bodies and their complexes) were found during sperm development of the chromadorids studied. In this respect their spermatogenesis differs significantly from that in secernents and monhysterids.La spermatogenèse a été étudiée en microscopie électronique à transmission chez deux espèces de nématodes libres marins (Panduripharynx pacifica et Euchromadora robusta) de la famille des Chromadoridae. Les spermatogonies, chez les deux espèces, sont des cellules indifférenciées avec un grand noyau entouré d'une petite quantité de cytoplasme. Chez P. pacifica, le cytoplasme des spermatocytes contient de nombreux corps de Golgi, des cisternae du RER, des ribosomes, des mitochondries et des corps sphériques denses. Le matériel filamenteux est accumulé dans les spermatides qui contiennent seulement des mitochondries et un noyau fragmenté (ou lobé) dépourvu d'enveloppe nucléaire. Le sperme immature resemble aux dernières spermatides: son aire centrale filamenteuse est entourée par des particules de chromatine et quelques mitochondries. La membrane plasmatique du sperme immature forme des invaginations profondes. Les spermatozoïdes matures, dans l'utérus, sont constitués par un petit corps cellulaire principal (MCB) portant un pseudopode proéminent rempli de filaments de cytosquelette. Le MCB contient un noyau et des mitochondries. La spermatogenèse chez E. robusta (étudiées seulement au niveau des testicules) ressemble à celle décrite chez P. pacifica, mais les spermatocytes d' E. robusta sont le siège d'une activité métabolique plus faible et, par conséquent, une masse plus faible de matériel filamenteux est stockée dans les spermatides et dans le sperme immature. Les spermatozoïdes de P. pacifica et le sperme immature d' E. robusta ont les mêmes caractéristiques ultrastructurales pour des nématodes (nature amiboïde, absence d'axonème, d'acrosome et d'enveloppe nucléaire) mais aucune des organelles aberrantes particuliéres à de nombreux spermes de nématodes (organelles membraneuses, corps fibreux paracrystallins et leurs complexes) n'ont été identifiées pendant le développement du sperme chez les Chromadorides étudiés. Par cet aspect, leur spermatogenèse diffère significativement de celle des Secernentes et des Monhysterides.
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Brzeski, Michal, e Ladislav Hanel. "Paratylenchinae: postembryonic developmental stages of Paratylenchus straeleni (De Coninck, 1931) and P. steineri Golden, 1961 (Nematoda: Tylenchulidae)". Nematology 1, n. 7 (1999): 673–80. http://dx.doi.org/10.1163/156854199508630.
Testo completoAbstract (sommario):
AbstractPostembryonic developmental stages of naturally occurring populations of Paratylenchus straeleni and P. steineri were studied. In the former species all juveniles had a well developed stylet and pharynx, while the body of the 4th stage juveniles contained numerous dark granules and this is considered the resting stage. In P. steineri the stylet and pharynx were well developed in the 2nd and 3rd stage juvenile, but the 3rd stage juvenile had numerous granules in the body suggesting it is the resting stage. Fourth stage juveniles had no stylets and the pharynx is much reduced. Because some moulting females have the stylet cone of the juveniles being shed together with the juvenile cuticle, it is concluded that the 4th stage is short-lasting. The length of the body, pharynx, tail and genital primordium as well as the index b increases in successive developmental stages. Indices a, c, c' were almost constant in all juvenile stages. The resting juvenile stage characterises species and it should be included in species descriptions for better characterisation of Paratylenchus species. Paratylenchinae: stades de developpement de Paratylenchus straeleni (De Coninck, 1931) et P. steineri Golden, 1961 (Nematoda: Tylenchulidae) - Ont ete etudies les stades de developpement post-embryonnaire de populations sauvages de Paratylenchus straeleni et de P. steineri. Chez la premiere espece tous les juveniles ont un stylet et un pharynx bien developpes alors que le corps des juveniles de 4eme stade contient de nombreux granules fonces; ce stade a donc ete considere comme le stade de quiescence. Chez P. steineri, le stylet et le pharynx sont bien developpes chez le second et troisieme stades juveniles, mais ce dernier montre de nombreux granules a l'interieur du corps, suggerant qu'il constitue le stade de quiescence. Les juveniles de 4eme stade sont depourvus de stylet et le pharynx est tres reduit. Du fait que chez les femelles en train de muer le cone du stylet des juveniles est rejete avec la cuticule des juveniles, il a ete conclu que le 4eme stade n'a qu'une courte duree de vie. Les longueurs du corps, du pharynx, de la queue et du primordium genital de meme que l'index b augmentent en passant d'un stade a l'autre. Les indices a, c et c' sont generalement constants chez tous les stades juveniles. Le stade quiescent des juveniles est caracteristique de l'espece et devrait etre inclus dans les descriptions d'especes pour une meilleure caracterisation specifique des Paratylenchus.
Tesi sul tema "Crop Corps"
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Chan, Nok Chin Lydia. "Grammar "bores the crap out of me!": A mixed-method study on the XTYOFZ construction and its usage by ESL and ENL speakers". Thesis, Stockholms universitet, Engelska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-194086.
Testo completoAbstract (sommario):
Different from Generative Grammar which sees grammar as a formal system of how words are put together to form sentences, Construction Grammar suggests that grammar is more than just rules and surface forms; instead, grammar includes many form-and-meaning pairings which are called constructions. For years, Construction Grammarians have been investigating constructions with various approaches, including corpus-linguistics, pedagogical, second language acquisition and so on, yet there is still room for exploration. The present paper aims to further investigate the [V the Ntaboo-word out of]-construction (Hoeksema & Napoli, 2008; Haïk, 2012; Perek, 2016; Hoffmann, 2020) (e.g., I kick the hell out of him.) and propose a new umbrella construction, “X the Y out of Z” (XTYOFZ) construction, for it. Another aim is to examine the usage and comprehension of the XTYOFZ construction by English as a Second Language (ESL) and English as Native Language (ENL) speakers. The usage context, syntactic and semantic characteristics of the XTYOFZ construction were examined through corpus linguistic methodology. Furthermore, processing and understanding of the construction by ESL and ENL speakers were tested via an online timed Lexical Decision Task as well as an online follow-up survey consisting of questions on English acquisition and usage, and a short comprehension task on the XTYOFZ construction. Corpus data shows that in general, the combination of non-motion action verbs (e.g., scare, beat) as X and taboo terms (e.g., shit, hell) as Y was the most common. Also, it was found that the construction occurs mostly in non-academic contexts such as websites and TV/movies. On the other hand, results from the Lexical Decision Task show that ESL speakers access constructional meaning slightly more slowly than ENL speakers. The follow-up survey also reflects that ESL speakers seem to have a harder time to produce and comprehend the construction compared to ENL speakers. By investigating the features of a relatively less-discussed construction and its usage by ESL speakers, this study hopes to increase the knowledge base of Construction Grammar and ESL construction comprehension and usage, particularly on the constructions that are mainly used in more casual settings.
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Oliveira, Danilo Gustavo Rodrigues de. "Papel de sinais crom?ticos na identifica??o de parceiros sexuais em sag?i comum (callithrix jacchus)". Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17279.
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Previous issue date: 2009-04-22Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior
The literature concerning color vision shows a trichromatic advantage in detecting ripe fruits and young leaves, but there are contradictory results. There is also the suggestion of this type of vision being adapted to perceive socio-sexual signals. Indeed, Old World primates utilize the skin color of conspecifics as a factor of attraction. But in New World primates there is no record of a coloration signal in the body that can be utilized by other group members. The present study aims to: 1- test whether there is a relation between coloration of body regions and ovulatory cycle in female Callithrix jacchus; 2- Determine if this species uses visual signals to choose mates that are sexually receptive. We collected feces from six females during one month to quantify progesterone concentration by EIA. Body region coloration was measured using a portable spectrometer and modeled to obtain the quantum catch of each photoreceptor, the opponency channels and chromatic distance between the points in units of JND. We recorded the behavior of six males exposed to three pairs of females with a cycling and a non-cycling female in each pair using a transparent plexiglass apparatus. The color of different body regions presented a correlation between progesterone concentration and the yellow-blue and red-green visual axes, with the genitalia as the region showing the highest correlation. The visual axis more apt to see the color variations was the yellow-blue in dichromats, and in trichromats were the red-green to face, yellow-blue to abdomen and both chromatic axes to genitalia. There was no difference in the signal detectability between trichromats and dichromats, but the perception pattern differed between the phenotypes, with a better signal detection by the dichromat phenotype 562 and the trichromat phenotype 543/562. During the behavioral experiments males presented longer gaze duration in periods of experimental manipulation and gaze duration was always longer towards cycling females compared to non-cycling females. Male locomotion during experimental manipulation was greater than in the control only during the periovulatory period of the female, indicating greater excitement. The behavior of cycling females was more active than the behavior of the non-cycling ones regarding locomotion and touching of the plexiglass division of the apparatus. Male gaze duration to cycling females increased with decreasing progesterone concentration, but none of the coloration parameters was correlated to the mate preference exhibited. This coloration signal can transmit information to animals of the group about fertility of female. Different from the intense red of the genitalia swellings of Old World primates, marmoset female genitalia became more bluish-green in the fertile period. Males chose fertile females and were able to visually identify the periovulatory period of females. Choice is related to progesterone concentration, but our results do not show relation between coloration and mate preference. Maybe some behavioral measure is associated with the choice
Estudos com vis?o de cores mostram vantagem dos tricromatas na detec??o de frutos maduros ou folhas jovens, mas existem controv?rsias. Tamb?m existe a sugest?o de adapta??o desse tipo de vis?o para sinais s?cio-sexuais. De fato, primatas do Velho Mundo utilizam a colora??o da pele de conspec?ficos como fator de atratividade. No entanto, em primatas do Novo Mundo n?o existe registro sobre a exist?ncia de um sinal de colora??o que possa ser utilizado por indiv?duos do grupo. O presente estudo visa: 1-testar se existe rela??o entre a colora??o da superf?cie corporal e o ciclo ovulat?rio em f?meas de Callithrix jacchus; 2- averiguar se essa esp?cie utiliza sinais visuais para a escolha de parceiros sexualmente receptivos. Foram coletadas fezes de seis f?meas durante um m?s para quantificar a concentra??o de progesterona via EIA. A colora??o de regi?es da pele foi mensurada com um espectrofot?metro port?til e modelada para obter a capta??o qu?ntica de cada fotorreceptor, os canais de opon?ncia visual e a dist?ncia crom?tica entre os pontos em unidades de JND. Em experimentos comportamentais, seis machos foram expostos a tr?s pares de f?meas contendo uma f?mea c?clica e uma sem ciclo ovulat?rio em um aparato de acr?lico transparente e o comportamento dos machos e f?meas foi anotado nesse per?odo. As partes do corpo medidas apresentaram correla??o entre concentra??o de progesterona e os eixos azul-amarelo e verde-vermelho, sendo que a correla??o mais forte foi com a colora??o da genit?lia. O eixo visual que se mostrou melhor adaptado a detectar essa varia??o de cor foi o azul-amarelo em dicromatas, enquanto que em tricromatas foi o verde-vermelho para a face, azul-amarelo para a barriga e para a genit?lia os dois eixos crom?ticos. A detec??o do sinal n?o apresentou diferen?as entre dicromatas e tricromatas, mas houve um padr?o de percep??o entre os fen?tipos que mostrou o fen?tipo dicromata e tricromata que possu?am, como cone M/L, 562nm e 543/562nm como os que melhor distinguiram o sinal. Durante os experimentos comportamentais os machos apresentaram maior tempo de dura??o do olhar durante os per?odos de manipula??o experimental e a dura??o do olhar para f?meas com ciclo ovulat?rio foi sempre maior do que para as que n?o ciclaram. A locomo??o dos machos durante a manipula??o foi maior que no controle somente durante o per?odo periovulat?rio da f?mea, indicando maior excita??o. O comportamento das f?meas c?clicas se mostrou mais ativo do que das que as ac?clicas quanto ? locomo??o e quanto a toques na barreira de acr?lico do aparato. Nenhum dos par?metros de colora??o se mostrou correlacionado com a escolha de parceiros sexuais dos animais, mas a dura??o do olhar dos machos para a f?mea c?clica aumentou com a diminui??o da concentra??o de progesterona. Esse sinal de colora??o pode transmitir informa??o para animais do grupo sobre fertilidade das f?meas. Ao contr?rio do vermelho intenso exibido em incha?os sexuais de primatas do Velho Mundo pr?ximos da ovula??o, as genit?lias de sag?is f?meas ficaram mais azuladas e esverdeadas nesse per?odo. Os machos apresentaram escolha por f?meas f?rteis e conseguiram identificar visualmente o per?odo periovulat?rio. A escolha de parceiros apresenta rela??o com n?veis de progesterona, mas nossos dados comportamentais n?o mostram rela??o com colora??o. Talvez medidas comportamentais estejam associadas com escolha
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Moreira, La?s Alves Ant?nio. "Sinaliza??o crom?tica da condi??o reprodutiva de f?meas de segui comum (Callithrix jacchus)". Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17350.
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Previous issue date: 2013-04-26As social animals, primates use different sensory modalities (acoustic, chemical, tactile and visual) to convey information about social and sexual status to conspecifics. Among these modalities, visual signals are widely used, especially color signals, since primates are the mammalian group that displays the greatest variety of colors in their skin and fur. Studies with Old World primate species suggest that hormonal variations are related to variations in the colors of individual faces and genitals. Therefore, chromatic cues can be used by conspecifics to identify the reproductive condition of an individual. To date, studies with the same approach are unknown for New World species. However, behavioral and physiological studies suggest that different New World primate species seem to perceive reproductive conditions such as the timing of female conception and gestation. Thus, in this study, our aim was to: i) identify whether there are chromatic cues on the skin of female common marmosets, (Callithrix jacchus) that indicate their reproductive condition; ii) define whether this chromatic variation can be perceived by all visual phenotypes known in this species; iii) identify if these chromatic cues can be perceived under different light intensity levels (dim, intermediate and high). For this, we selected 13 female common marmosets in four distinct reproductive conditions: pregnant female preceding parturition, postpartum mothers, noncycling and cycling females. The coloration of the skin in genital and thigh areas in females was measured using a spectrophotometer. Using mathematical models of visual perception, we calculated the values of quantum catch for each photoreceptor type known in this species, the visual opponency channels and color contrast between those body spots. Our results indicate the occurance of chromatic variations in the genital area during the weeks that precede and follow parturition, forming a U-pattern of variation perceptible to males and females in natural conditions of low and high luminosity. Furthermore, we observed distinct color patterns in the genital skin of pregnant and cycling females that indicate their reproductive conditions. Finally, we present evidence of color contrast in noncycling females that is higher than that of pregnant ones. This study suggests that there is a chromatic xii variation in the genital skin of females that can be perceived by conspecifics and that may be related to hormonal changes typical of pregnancy and the ovarian cycle
Como animais sociais, os primatas usam sinais de diferentes modalidades (ac?stico, qu?mico, t?til e visual) para transmitir informa??es sobre status social e sexual a membros da mesma esp?cie. Dentre essas modalidades, os sinais visuais s?o amplamente utilizados, especialmente os sinais de cor, uma vez que dentre os mam?feros, os primatas formam o grupo com maior variedade de cores em suas peles e pelos. Trabalhos com esp?cies de primatas do Velho Mundo sugerem que varia??es hormonais estejam relacionadas com varia??es crom?ticas vis?veis em ?reas genitais e faces de machos e f?meas. Desta forma, pistas crom?ticas podem ser usadas por coespec?ficos para identificar a condi??o reprodutiva de um indiv?duo. At? o momento, trabalhos com essa mesma abordagem em esp?cies do Novo Mundo s?o desconhecidos. Por?m, estudos comportamentais e fisiol?gicos sugerem que diferentes esp?cies de primatas do Novo Mundo parecem perceber caracter?sticas reprodutivas como o momento da concep??o e a fase da gesta??o em f?meas. Desta forma, neste trabalho buscamos: i) identificar se existem pistas crom?ticas na pele de f?meas de sagui comum (Callithrix jacchus) que indicam a condi??o reprodutiva; ii) determinar se essas pistas s?o percept?veis aos diferentes fen?tipos visuais encontrados na esp?cie; iii) identificar qual seria o efeito de diferentes condi??es de ilumina??o na detec??o dessa colora??o. Para isso, trabalhamos com 13 f?meas de sagui comum em quatro condi??es reprodutivas distintas: gestantes pr?-parto, gestantes p?s-parto, ovulat?rias e n?o ovulat?rias. A colora??o de ?reas da pele das f?meas foi mensurada utilizando um espectrofot?metro e, utilizando modelos matem?ticos de percep??o visual, calculamos os valores de capta??o qu?ntica para cada tipo de fotorreceptor presente na esp?cie, os canais de opon?ncia visual e o contraste crom?tico entre duas ?reas corp?reas. Esse trabalho mostra evid?ncias de varia??o no contraste crom?tico das peles da genit?lia e da coxa nas semanas que antecedem e sucedem o parto, formando um padr?o de varia??o em U percept?vel a machos e f?meas em condi??es naturais de baixa e alta luminosidade. Al?m disso, evidenciamos padr?es de colora??o distintos na regi?o da pele genital para f?meas gestantes que indicam uma sinaliza??o dessa condi??o reprodutiva. Por fim, apresentamos evid?ncias de que o contraste de cor em f?meas x ovulat?rias e n?o ovulat?rias ? superior ao de f?meas gestantes. Este estudo sugere que existe uma varia??o crom?tica na pele genital de f?meas, que essa varia??o ? percept?vel a coespec?ficos e que pode estar relacionada ?s altera??es hormonais acentuadas que ocorrem durante a gesta??o e o ciclo ovariano
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Juknevičius, Algirdas. "Javų agrofitocenozių produktyvumo tyrimai". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090615_114910-86673.
Testo completoAbstract (sommario):
Tiriamojo darbo objektas – varpinių javų pasėliai smėlinguose Dzūkijos dirvožemiuose.
Tyrimo tikslas – nustatyti pagrindinių produktyvumo rodiklių įtaką varpiniams javams.
Tyrimo metodika. Tyrimas buvo atliktas viename ekologiniame ūkyje, tačiau šešiuose laukuose. Tirti žieminiai kvietrugiai, žieminiai kviečiai ir vasariniai miežiai pasėti skirtinguose priešsėliuose. Piktžolių bei rugių kiekis buvo nustatomas kiekviename lauke išskiriant po 0,25 m2 tyrimo laukelius kiekvieno lauko pradžioje, viduryje ir gale. Gauti duomenys perskaičiuoti į 1 m2. Pasirinktuose tyrimo laukeliuose skaičiavimai atlikti vegetacijos pradžioje ir prieš derliaus nuėmimą. Vegetacijos pradžioje nustatytas pasėlių ir piktžolių skaičius, o prieš derliaus nuėmimą apskaičiuotas produktyvių, neproduktyvių stiebų bei piktžolių skaičius. Prieš derliaus nuėmimą iš kiekvieno tyrimo laukelio javų stiebai ir piktžolės buvo raunamos su šaknimis, ir skaičiuojamas kiekis.
Tyrimo rezultatai. Atlikus tyrimus minėtuose javų laukuose pastebėta, kad labiau piktžoleti yra žieminių kvietrugių ir žieminių kviečių laukai. Didžiausias pikžolėtumas pastebėtas žieminių kvietrugių lauke po žirnių/miežių mišinio pavasarį (vidurkis 118 piktžolių) ir žieminių kviečių lauke po varpinių javų rudenį (vidurkis 117 piktžolių). Mažiausią piktžolėtumą turėjo vasarinių miežių laukai. Vasarinių miežių pasėtų po kviečių pavasarį lauke buvo rasta mažiausiai piktžolių (vidurkis 27 piktžolės), tačiau derliai nebuvo dideli... [toliau žr. visą tekstą]Ecological agriculture‘s number grows up in Lithuania. In the course of time farmers is still looking for a solution how to do a bigger produktivity. Analysis is about corn‘s and weed‘s variation depending on preplants and produktive stipes‘ subjeck to the weeds. Crop was quite dence in the property. Depending on preplants produktive stipes‘ number was different. Productive stipes hang on weeds‘ number: the more weeds the less productive stipes.
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Montalti, Chiara. "Per una prospettiva cyborg della disabilità: relazioni con l’alterità, politica e futuri culturali". Doctoral thesis, 2022. http://hdl.handle.net/2158/1277905.
Testo completoAbstract (sommario):
La tesi si propone di problematizzare il ruolo marginale delle persone disabili nei nostri mondi socioculturali. L’analisi si articola principalmente in tre assi: la natura contestabile e relazionale della disabilità; il radicamento delle persone disabili nel tessuto sociale, politico, e culturale, registrandone e valorizzandone i contributi; l’espansione delle condizioni di vivibilità del presente e del futuro. In tale percorso mi sono concentrata su quattro temi, che si intrecciano in ognuno dei capitoli: il rapporto con le tecnologie; le relazioni di cura e assistenza (umane e non umane); la partecipazione politica e l’attivismo; le narrazioni da aggiornare sul piano immaginativo-culturale.
Sebbene i Disability Studies siano l’area di ricerca di riferimento, ho impiegato la figurazione del cyborg come uno strumento di navigazione che potesse porli in dialogo col lavoro di Donna J. Haraway, il postumanesimo e la tecnoscienza femminista: ho infatti evidenziato quali possano essere le potenzialità di tale incontro nell’esaminare proficuamente ciascuno dei temi trattati.
Nello specifico, la tesi si struttura in tre sezioni, ognuna focalizzata su un macrotema: (I) il rapporto che intercorre tra il cyborg – in senso largo – e la disabilità; (II) la relazionalità e l’apertura verso l’esterno, in termini esperienziali e politici; (III) la collocazione delle persone disabili nel futuro, tanto in ambito culturale, quanto immaginato nella fiction fantascientifica.
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The thesis critically assesses the marginal role of disabled people in our sociocultural worlds. The analysis is structured into three axes: the debatable and relational nature of disability; the rooting of disabled people in the social, political, and cultural fabric, recording and valuing their contributions; the possibility to produce livable presents and futures. In this path, I focused on four topics, intertwined in each of the chapters: the connection with technologies; the relationships of (human and non-human) care and assistance; political participation and activism; the urge to update cultural and imaginative texts.
Although Disability Studies are the research area of reference, I employed the figuration of the cyborg as a navigation tool that could put them in dialogue with the work of Donna J. Haraway, posthumanism and feminist technoscience: I have highlighted the potentiality of this conversion, to examine profitably each of the mentioned topics.
Specifically, the thesis is structured in three sections, each focused on a macro theme: (I) the association between the cyborg – in a broad sense – and disability; (II) the experience of relationality, in biographical and political terms; (III) the positioning of disabled people in the future, both in the cultural world and in science fiction.
Libri sul tema "Crop Corps"
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bālaśeltān, Ethiopia YaMāʻekalāwi stātistiks, a cura di. Crop production forecast, 1991/92 (1984 E.C.): Results of area and production of major corps : (private peasant holdings meher season). Addis Ababa: The Authority, 1992.
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ill, Miyake Yoshi, a cura di. Plenty Coups. Milwaukee: Raintree, 1990.
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Whitmore, Susan. Physiology of flowering of horticultural corps 1980-1987: 289 citations. Beltsville, Md: U.S. Dept. of Agriculture, National Agricultural Library, 1988.
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Warmbrodt, Robert D. Gene expression in horticultural corps: January 1988 - March 1991. Beltsville, Md: National Agricultural Library, 1991.
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1869-1938, Linderman Frank Bird, a cura di. Plenty-coups, chief of the Crows. Lincoln: University of Nebraska Press, 2002.
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United States. Congress. House. Committee on International Relations. Health, Safety, and Security of Peace Crops Volunteers Act of 2004: Report (to accompany H.R. 4060) (including cost estimate of the Congressional Budget Office). [Washington, D.C: U.S. G.P.O., 2004.
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1848-, Allen William Alonzo, a cura di. Blankets and moccasins: Plenty Coups and his people, the Crows. Lincoln: University of Nebraska Press, 1987.
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Resources, United States Congress House Committee on Public Works and Transportation Subcommittee on Water. Proposed authorizations for the water resources development program of the U.S. Army Corps of Engineers: Hearings before the Subcommittee on Water Resources of the Committee on Public Works and Transportation, House of Representatives, One Hundred First Congress, second session, March 1, 7, 14; April 24, 1990. Washington: U.S. G.P.O., 1990.
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(Illustrator), Yoshi Miyake, a cura di. Plenty Coups, Crow (Native American Stories). Steck-Vaughn, 1998.
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Ornamental Bulbs, Corms and Tubers (Crop Production Science in Horticulture, No 1). CABI, 1996.
Cerca il testo completoCapitoli di libri sul tema "Crop Corps"
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Kowalevski, Sophie. "Sur le problème de la rotation d’un corps solide autour d’un point fixe". In The Kowalevski Property, 317–72. Providence, Rhode Island: American Mathematical Society, 2002. http://dx.doi.org/10.1090/crmp/032/18.
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Arun Kumar R., Vijay S. Rajpurohit e Sandeep Kautish. "A Study on Technology-LED Solutions for Fruit Grading to Address Post-Harvest Handling Issues of Horticultural Crops". In Modern Techniques for Agricultural Disease Management and Crop Yield Prediction, 203–21. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9632-5.ch009.
Testo completoAbstract (sommario):
The reduction of post-harvest losses and value addition of the horticultural corps has attained the higher priority of the current research works. Grading is the major phase in post-harvest handling. Presently grading is done on the basis of observation and through experience. Various drawbacks associated with such manual grading are subjectivity, tediousness, labor requirements, availability, inconsistency, etc. Such problems can be alleviated by incorporating automation in the process. Researchers round the clock are working towards the development of technology-driven solutions in order to grade/sort/classify various agricultural and horticultural produce. With the motto of helping the researchers in the field of grading and quality assessment of fruits and other horticulture products, the present work endeavors the following major contributions: (1) a precise and comprehensive review on technology-driven solutions for grading/sorting/classification of fruits, (2) major research gaps addressed by the researchers, and (3) research gaps to be addressed.
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Avise, John C. "Getting Creative with Crops". In The Hope, Hype, & Reality of Genetic Engineering, 30–76. Oxford University PressNew York, NY, 2004. http://dx.doi.org/10.1093/oso/9780195169508.003.0004.
Testo completoAbstract (sommario):
Abstract About 10,000 years ago, our forebears invented agriculture and its sister enterprise, selective breeding. By purposefully sowing the seeds of desirable wild plants, harvesting the resulting foods or fibers, and retaining seeds from favored specimens for subsequent planting, our ancestors gradually transformed native plant varieties into the bountiful corns, rices, cottons, tomatoes, and other productive domestic crops that we enjoy today. Such artificial selection over the eons required no sophisticated gene technologies, no detailed understanding of hereditary mechanisms, no cognizance of evolutionary processes— just a keen eye for desirable plant traits, strong arms to till land and tend crops, and patience.
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Behlau, Irmgard. "Croup, supraglottitis, and laryngitis". In Schlossberg's Clinical Infectious Disease, a cura di Cheston B. Cunha, 200–204. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780190888367.003.0030.
Testo completoAbstract (sommario):
This chapter assesses acute supraglottitis (epiglottitis), croup, and laryngitis. Croup is a clinical syndrome characterized by a seal-like barking cough, hoarseness, inspiratory stridor, and often some degree of respiratory distress. It is primarily a disease of children between the ages of 1 to 6 with peak incidence between 6 months and 3 years. Rapid, objective, and calm assessment of severity must be done to determine management and without respiratory compromise. Meanwhile, supraglottitis is characterized by inflammation and edema of the supraglottic structures, including the epiglottis, arytenoepiglottic folds, arytenoids, and false vocal cords. Treatment of acute supraglottitis is directed at establishing an airway and administering appropriate antibiotics. Finally, acute laryngitis often presents with hoarseness, odynophagia, and localized pain, which may also be referred and manifests as otalgia. Because most cases of acute laryngitis are viral in etiology and self-limited, treatment usually consists of resting the voice and inhaling moistened air.
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Yandell, Kay. "Moccasin Telegraph". In Telegraphies, 24–55. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190901042.003.0002.
Testo completoAbstract (sommario):
Nineteenth-century European American telegraph writers often conceive Native telegraph systems, not as primitive, merely metaphorical precursors to their own superior technology, but as in some ways differing, in some ways equivalent, always valid, and potentially threatening real telegraphs. Crow chief Plenty Coups and Crow medicine woman Pretty Shield tell of Native telegraphs that combat U.S. technologies throughout the Indian Wars and especially at the Battle of the Little Bighorn, with surprising national divisions and results, to show the extent to which perceptions about Native telecommunication systems potentially influence nineteenth-century and current understandings of telegraphy.
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Titus, Jill Ogline. "An American Town". In Gettysburg 1963, 8–27. University of North Carolina Press, 2021. http://dx.doi.org/10.5149/northcarolina/9781469665344.003.0002.
Testo completoAbstract (sommario):
This chapter explores segregation in Gettysburg, examining how racial discrimination in employment, housing, and education functioned in this iconic community. In addition to revealing how Civil War Memory was frequently utilized to underscore and justify discrimination, it also provides a blueprint for understanding the workings of northern segregation in small and mid-size communities. The chapter includes significant discussion of a large-scale 1925 Ku Klux Klan rally; the establishment of black Civilian Conservation Corps camps on the battlefield during the Great Depression; segregation in public accommodations during the 1950s; and initial attempts by local civil rights activists to challenge Jim Crow.
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Amato, Bruna, e Marivete Gesser. "MULTIDÃO INSUBORDINADA: PERSPECTIVAS PSICOPOLÍTICAS PARA ALÉM DE IDENTITARISMOS". In As Várias Faces de Eva: o feminino na contemporaneidade - Volume 2, 198–211. Editora Científica Digital, 2023. http://dx.doi.org/10.37885/230212178.
Testo completoAbstract (sommario):
Este capítulo objetiva criar um diálogo entre conceitos da teoria queer e crip que versem sobre a necessidade de os corpos dissidentes encerrarem elos identitários, cuja função retorna a um marco estratégico de relações de poder. Para tanto, problematizamos acerca da insubordinação, que emerge da possibilidade de resistir à estrutura social capitalista neoliberal produtora de hierarquizações e assujeitamentos às vivências desviantes. Consideramos a insubordinação como uma linha de fuga que se ergue dentro de uma lógica na qual pessoas inicialmente circunscritas em categorias identitárias fixas podem se transformar em sujeitos políticos e, em coalizão, apostar na criação de comunidades múltiplas e diversas, resistindo coletivamente às diversas formas de homogeneização cultural. Assim, discutiremos sobre o processo no qual corpos que não são passíveis de serem adestrados e que reivindicam não se encaixar em qualquer lugar se tornam uma ameaça. O risco é de nos encontrarmos dentro de um processo de nomadismo que reconhece e enaltece a importância da diferença como primordial para qualificar boas relações, acolhendo estropiadas e invertidas - nenhuma interessante aos moldes capitalistas de produção, seja material ou afetiva. Por fim, este capítulo visa levantar discussões de campos teóricos da Psicologia Social que sugerem, como linhas de fuga potencializadoras, ações coletivas e micropolíticas como forma de driblar estruturas encarcerantes e violentas.
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Brown, Ashley. "Resurfacing". In Serving Herself, 157—C6P130. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197551752.003.0007.
Testo completoAbstract (sommario):
Abstract This chapter explores Althea Gibson’s experience with the trials that came with integration. It begins by looking at how she got into a position of both prestige and peril as a PE teacher at Lincoln University in Jefferson City, Missouri. On the one hand, female PE teachers were seen as improving the health of African Americans, who had too often been experimented on when they were not being ignored. On the other hand, physical educators were sometimes dismissed on college campuses. Gibson had to navigate the fraught gender politics of her field. The chapter then considers how she challenged the rules of gender at Lincoln, as well as the lesbian athlete stereotype. It also recounts how Gibson confronted segregation and Jim Crow in Jefferson City. Finally, the chapter details how she joined the Women’s Army Corps (WAC), and how Gibson’s identity made her a valuable asset to the State Department as federal officials sent a team of tennis players to Southeast Asia for goodwill tours as part of a propaganda campaign designed to improve America’s image.
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Boyarin, Jonathan. "The Professor". In Yeshiva Days, 156–79. Princeton University Press, 2020. http://dx.doi.org/10.23943/princeton/9780691203997.003.0007.
Testo completoAbstract (sommario):
This chapter recounts the life of the author as a junior associate at a major New York corporate law firm, an anthropologist, and his early kollel year at Mesivtha Tifereth Jerusalem (MTJ). It details the months he spent studying the Mishnah with Petrushka's Yiddish commentary with Nasanel. The chapter also focuses on the tractate Kilaim, a rarely studied text that deals with the rules about forbidden mixtures of planted crops. It tackles the beginning of the entire mishnaic corpus and study Petrushka on the tractate Berachos (blessings), with the goal of eventually studying together all of the Mishnah. The chapter acknowledges the encouragement the author received from his fellows at MTJ and recalls a brief conversation he had with Rabbi Weiss, after spending some time with him and Rabbi Karp studying Mishnah berurah. Ultimately, it discusses the author's field notes from the beginning of this “project,” which give the lie to his claim that he doesn't think of the yeshiva as a separate “world.”
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"A Randomized Trial of Low-Phytate Corn for Maternal-Infant Micronutrient Deficiency in Rural Guatemala". In Ethical Issues in International Biomedical Research, a cura di James V. Lavery, Christine Grady, Elizabeth R. Wahl e Ezekiel J. Emanuel, 297–310. Oxford University PressNew York, NY, 2007. http://dx.doi.org/10.1093/oso/9780195179224.003.0019.
Testo completoAbstract (sommario):
Abstract Guatemala is located in Central America and borders Mexico and Belize to the north and Honduras and El Salvador to the southeast. Colonized by the Spanish in the sixteenth century, Guatemala became independent in 1821. Until the 1990s, Guatemalan political rule was characterized by dictatorships, insurgencies, coups, and military rule, with little representative government. Guatemala suffered from a 36- year guerrilla war that killed 100,000 people and displaced another million. The war ended in 1996 with the signing of a peace treaty. Political strife has inhibited development of the economy and infrastructure, particularly transportation, telecommunication, and electricity. The distribution of income and wealth remains highly skewed. Guatemala is relatively poor with a per capita GDP of US$4,700 purchasing power parity, which is about half that of Brazil. Unfortunately, income is highly skewed with 75% of the population living below the poverty line. Most people depend on subsistence farming. Agriculture contributes 23% of GDP and accounts for 75% of exports. The main crops are coffee, sugar, and bananas. Guatemala. Guatemala recently signed a free-trade agreement with Honduras, El Salvador, and Mexico.
Atti di convegni sul tema "Crop Corps"
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Ariff, A. L. Zul, M. Nursalwani e A. Mohammad Amizi. "Participation of youth in integrated crops of corns and tapioca in Kelantan: Pre-test". In PROCEEDINGS OF 8TH INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS ENGINEERING & TECHNOLOGY (ICAMET 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0051507.
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Pereira, Francisco Alves, Alessandro Capone e Fabio Di Felice. "Hydrodynamics of the Wake of Contra-Rotating Propellers at Different Loading Conditions". In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20098.
Testo completoAbstract (sommario):
Abstract This work presents an experimental study of the wake hydrodynamics of a three-blade contra-rotating propeller system (CRP) at advance ratio J = 0.7, 1 and 1.3. The study is carried out in a cavitation tunnel by employing a mixed hardware-software phase-locked acquisition and processing scheme. Flow measurements are thus phase-averaged based on both the forward and aft propeller angular position, so that the effect of their relative position on the flow features is investigated. Average and fluctuating velocity fields along with vorticity are presented and discussed. Strong interactions take place between the forward and aft propellers’ trailing vorticity with regular patterns of vortex reconnection and break-up which depend on the advance coefficient. Flow visualizations, carried out by inducing cavitation in the vortex cores, show that complex though organized patterns of helical coaxial vorticity occur within the wake.
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Khan, Suhail Ahmad, V. Jagannathan e R. P. Jain. "IAEA CRP Benchmark of Kalinin VVER-1000 NPP: An Analysis Using EXCEL-TRIHEX-FA Code System". In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48613.
Testo completoAbstract (sommario):
Two units of VVER-1000Mwe reactors are in an advanced stage of construction at Kudankulam, Tamilnadu, India. With a view to assess the capability of analyzing the physics characteristics of VVER cores, the IAEA CRP benchmark problem of Kalinin VVER-1000 MWe NPP [1] is studied using the indigenous code system EXCEL-TRIHEX-FA [2,3]. The lattice burnup code EXCEL is based on a combination of 1-D multigroup transport theory and 2-D few group diffusion theory. Nuclear data in 172 group WIMS-D format based on JEFF-3.1 [4] has been used in the present analysis. The core level calculations are performed using the code TRIHEX-FA which solves the 3-D multigroup diffusion equation using the finite difference method with fine triangular meshes. Power dependent feedback models for xenon, Doppler, coolant temperature and density values have been incorporated in TRIHEX-FA. Keff for the critical soluble boron concentration, assembly power distribution and axial power distribution are calculated as a function of fuel cycle burnup. In the present paper, lattice level results are compared with the results of other participants reported in Ref. [1]. The results of core level calculations have been compared with the experimental data provided [1].
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Conti, Alexander A., e Elizabeth H. Gierlowski-Kordesch. "Delineating Lake Types of the Jurassic East Berlin Formation, Hartford Basin, Newark Supergroup". In Northeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016ne-271926.
Testo completoAbstract (sommario):
The Mesozoic Hartford Basin, a fault-bounded half-graben in New England, is composed of four sedimentologic units displaying lacustrine, playa, and alluvial conditions separated by three tholeiitic basalt flows. Limited outcrop, however, has restricted analyses across the basin. The Jurassic East Berlin Formation, in particular, crops out only in the southern and northern extents of the basin, exposing the upper 100-118-m of deposits. As a result, a new core analysis across a 600-m-transect of East Berlin rocks has been completed in the central region of the basin, exposing the entire 195-m thickness of the formation for the first time. Cores expose eight 3-m-thick lacustrine mudrock units, the upper six of which are correlative to lake deposits identified in the southern and northern extents of the basin. Additionally, thin chicken-wire evaporites demarcate the lowermost, previously unexposed, lacustrine unit, 7-m beneath a 15-cm-thick tufa horizon. Thin playa deposits and thick sheetflood and Vertisol packages separate these lake sequences over 5-30-m of vertical distance.To supplement these sedimentologic data, and better understand lake geochemistry of the basin during East Berlin time, new biomarker analyses have been applied to each of the eight lacustrine mudrock units for the first time. Biomarker data are useful for determining the lake-basin type, a paleolake classification system derived by Bohacs, Carroll, and others to describe predictable physical and geochemical evolution within rift basins from fluvial facies to over-filled, balance-filled, and under-filled lacustrine facies; subsequently, balance-filled lacustrine facies grade to a terminal fluvial facies during changes in accommodation space through time. While fluvial facies envelope lake deposits within the Hartford Basin, identifying the lake types within the East Berlin has been problematic because of limited exposures. These new sedimentologic and biomarker analyses, however, suggest balance-filled lacustrine conditions at the base of the East Berlin that grade into under-filled conditions upsection. These new biomarker data finally provide definitive evidence for changing lake types during East Berlin time.
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Xu, Ting, e Yi Wei. "Optimization of Gas Channel Controlling Technique During Co2 Immiscible Flooding in Normal Pressure Tight Oil Reservoir——A Case Study of Honghe Chang 8 Reservoir in South Ordos Basin". In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21334-ms.
Testo completoAbstract (sommario):
Abstract Tight oil reservoir is commonly recognized to be difficult to supply the formation energy. Tight oil reservoir in Ordos basin is characterized to be continental sedimentation, strong heterogeneity, normal pressure (0.9), low reserve abundance, imperative to supply the displacing energy. CO2 have good injection and high displacing efficiency for extra-low permeability reservoir, which provides the reference for exploring the effective development mode in tight reservoir. Influencing by complex fracture and hydraulic fracturing, as CO2 flooding is conducted in tight oil reservoir, gas channeling phenomenon is very serious, displacing energy is difficult to be utilized. To enlarge CO2 sweep efficiency, how we can effectively control CO2 channeling becomes the first important issue in energy supplying development of normal pressure tight reservoir. In the paper, a case of Honghe Chang 8 tight oil reservoir was carried out. Medium-large and medium-small scale fractures were artificial fabricated in natural crop cores according to G&G understanding. In different fracture openings models, two-stage blocking experiments with CO2 flooding were operated with high-strength starch gel and weak-strength ethylenediamine. Slug combination, volume and sequence were evaluated and by numerical simulation, blocking strength were defined to reflect the plugging effect in the experiment. Then build up well group numerical simulation model, characterizing the complex fracture network. Blocking sites and volume of plugging agents were analyzed and optimized. Two-stage blocking technique was determined in the fracture developed tight reservoir during CO2 flooding. Research results indicate it is priority to control the gas channeling of medium-large scale fractures with sufficient volume of the starch gel. As CO2 flooding is performed, gas starts to break through, followed by small volume ethylenediamine to mitigate gas channeling. Numerical simulation shows that firstly fully controlling gas channeling from medium-large scale fracture along with principal stress, then injecting plugging agent from the injection well, being located in 1/3~1/2 of well space to treat medium-small scale fractures with the best production stimulation. Starch gel volume is determined by medium-large scale fractures pore volume(PV), while low concentration starch gel and ethylenediamine volume is optimized to be half of the medium-small scale fracture PV, in which PV of fracture permeability lower than 200×10-3μm2 determine ethylenediamine volume. Generally, plugging agent would be more than 1500m3 for a pair of I-P wells. With low cost CO2 source, CO2 flooding is expected to be one of the important development modes for normal pressure tight oil reservoir. During CO2 immiscible flooding, gas channel controlling technique plays decisive roles in ensuring successful development. Research results are not only advisable for the Ordos normal pressure tight reservoir development, but also for the similar tight reservoir in the world.
Rapporti di organizzazioni sul tema "Crop Corps"
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Gera, Abed, Abed Watad, P. Ueng, Hei-Ti Hsu, Kathryn Kamo, Peter Ueng e A. Lipsky. Genetic Transformation of Flowering Bulb Crops for Virus Resistance. United States Department of Agriculture, gennaio 2001. http://dx.doi.org/10.32747/2001.7575293.bard.
Testo completoAbstract (sommario):
Objectives. The major aim of the proposed research was to establish an efficient and reproducible genetic transformation system for Easter lily and gladiolus using either biolistics or Agrobacterium. Transgenic plants containing pathogen-derived genes for virus resistance were to be developed and then tested for virus resistance. The proposal was originally aimed at studying cucumber mosaic virus (CMV) resistance in plants, but studies later included bean yellow mosaic virus (BYMV). Monoclonal antibodies were to be tested to determine their effectiveness in interning with virus infection and vector (aphid) transmission. Those antibodies that effectively interfered with virus infection and transmission were to be cloned as single chain fragments and used for developing transgenic plants with the potential to resist virus infection. Background to the topic. Many flower crops, as lily and gladiolus are propagated vegetatively through bulbs and corms, resulting in virus transmission to the next planting generation. Molecular genetics offers the opportunity of conferring transgene-mediated disease resistance to flower crops that cannot be achieved through classical breeding. CMV infects numerous plant species worldwide including both lilies and gladioli. Major conclusions, solutions and achievements. Results from these for future development of collaborative studies have demonstrated the potential transgenic floral bulb crops for virus resistance. In Israel, an efficient and reproducible genetic transformation system for Easter lily using biolistics was developed. Transient as well as solid expression of GUS reporter gene was demonstrated. Putative transgenic lily plantlets containing the disabled CMV replicase transgene have been developed. The in vitro ability of monoclonal antibodies (mAbs) against CMV to neutralize virus infectivity and block virus transmission by M. persicae were demonstrated. In the US, transgenic Gladiolus plants containing either the BYMV coat protein or antisense coat protein genes have been developed and some lines were found to be virus resistant. Long-term expression of the GUS reporter gene demonstrated that transgene silencing did not occur after three seasons of dormancy in the 28 transgenic Gladiolus plants tested. Selected monoclonal antibody lines have been isolated, cloned as single chain fragments and are being used in developing transgenic plants with CMV resistance. Ornamental crops are multi-million dollar industries in both Israel and the US. The increasing economic value of these floral crops and the increasing ban numerous pesticides makes it more important than ever that alternatives to chemical control of pathogens be studied to determine their possible role in the future. The cooperation resulted in the objectives being promoted at national and international meetings. The cooperation also enabled the technology transfer between the two labs, as well as access to instrumentation and specialization particular to the two labs.