Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"galling"”.
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Galling failures in pin joints
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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A novel method of detecting galling and other forms of catastrophic adhesion in tribotests
… was used as a key indicator of the occurrence of galling. The findings of this research forms a knowledge base for the development of a decision support system (DSS) to identify lubricant failure based on industrial application requirements.
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Interaction of stainless steel threaded fasteners with stainless steel locking inserts
… of lubrication for threaded fastening systems, galling between the threaded fastener and the locking insert was determined to be the major concern. Galling occurs at the highly loaded thread interface of the components and is attributed to the adhesive and sliding wear conditions that exist …
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The onset of gouging in high-speed sliding contacts
… matched the existing models well, though galling damage to copper rails was often as severe as gouging. Gouging was delayed using electroplated aluminum coatings as thin as 2 μm, though this is not necessarily a robust solution. Macroscopic indentations were found to have negligible effect …
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Resource partitioning in buds and insect induced galls in the biocontrol of Acacia pycnantha
… An important factor concerning the effect galling has on A. pycnantha is the time during the trees reproductive cycle that galling occurs. It has been shown that when galling coincides with the season when the most energy is channelled into reproduction that the damage to the tree is …
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The Effects of Hackberry Psyllids on Refueling Migratory Songbirds and Autumnal Seed Rain
… psyllids (<em>Pachypsylla sp</em>) are a galling insect native to North America’s hackberry trees (<em>Celtis sp</em>). Hackberry leaf-galling psyllids are ephemerally abundant during autumn, a period of time when migratory songbirds are traveling from their breeding areas in temperate …
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Reproduction of a root-knot nematode population on flue-cured tobacco homozygous for Rk1 and/or Rk2 resistance genes and the effect of soil temperature on resistance gene efficacy
… soil temperatures impact their efficacy. Root galling, numbers of egg masses and eggs, and the reproductive index were compared from roots of Coker 371-Gold (susceptible), NC 95 and SC 72 (Rk1Rk1), T-15-1-1 (Rk2Rk2), and STNCB-2-28 and NOD 8 (Rk1Rk1 and Rk2Rk2). The same data were analyzed from …
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Managing Weeds and Soilborne Pests with Fumigant and Non-Fumigant Alternatives to Methyl Bromide
… increased tomato yield and decreased root galling from root-knot nematodes in an infested field. Hybrid rootstock "RST 106" resulted in the lowest root-knot nematode galling. In conclusion, TIF with reduced rates of DMDS or MeI is a viable MBr alternative for fresh market tomato production …
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The roles of proteinases and proteinase inhibitors in plant-nematode interactions
… plant resistance against nematodes. Root galling in cultured root and seedlings expressing inhibitor I or II gene was reduced as compared with controls. Nematode development was also retarded in proteinase inhibitor-expressing root cultures. In the second part of this study, the effects of …
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The study of intermetallic particles in aluminium alloy AA3104 can-body stock during homogenisation
… These parameters are earing, tear-off and galling resistance. During homogenisation of AA3104 direct chill (DC) ingot, there is a phase transformation from β-Al₆(Fe,Mn) orthorhombic phase to the harder α-Alₓ(Fe,Mn)₃Si₂ cubic phase. Phase transformation occurs by diffusion of Si and Mn, …
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Development and testing of a greenhouse assay for screening potato germplasm for susceptibility to Spongospora subterranea f. sp. subterranea (powdery scab)
… Valley (SLV). Cultivars were evaluated for root galling, tuber lesion incidence, and severity. Soil with 50% sand, an inoculum level of one sporeball per gram of soil , and relatively high soil moisture (0-10 chars) had the most consistent symptom expression when compared with field results . …
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Jeremy Gridley Father of the Boston Bar
… a government, whose unwise restrictions were galling to an enterprising people, was anathemitized. It is only recently - historically speaking - that this provincial outlook has been replaced by one of broader scope, and Americana can see good in and show gratitude to others not possessing the …
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On developing a graphitic white iron for metal-to-metal wear systems
… easily during use, which in turn led to micro-galling defects that caused parts leakage. Increasing thermal diffusivity of the material was recommended to improve the performance of wear components.</p> <p>A new alloy, graphitic white iron, was developed for metal-to-metal wear systems by …
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Assessing the drivers of adaptive radiation in a complex of gall midges: A multitrophic perspective on ecological speciation
… may limit the general density of galling insects. I conclude that divergence in gall morphology and ovipositional behaviors are, at least in part, determined by natural selection imposed by natural enemies and that these forces may help explain the diversity of gall morphologies …
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Why do wasp induced galls of Acacia longifolia photosynthesise?
… host plant in order to serve the demands of the galling herbivore. This study investigated the photosynthetic capacity of bud galls induced by the wasp, Trichilogaster acaciae longifoliae (Pteromalidae) in the invasive Acacia longifolia. The role of this photosynthetic activity was examined in …
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Wasps (Hymenoptera: Chalcidoidea) associated with galls in seed-capsules of Eucalyptus camaldulensis (Myrtaceae) in South Africa : species composition, trophic relationships and effects
… chapter, an account is given of the effect of galling on seed production in the three E. camaldulensistrees in Pretoria, as an indication of the ability of the gall inducer to reduce the invasiveness of E. camaldulensis in South Africa without compromising its valuable attributes. It was …
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Reproduction of the root-knot nematode Meloidogyne arenaria on flue-cured tobacco possessing resistance genes Rk1 and/or Rk2 and the impact of parasitism on the accumulation of nicotine in conventional and low-alkaloid tobacco
… the combination of Rk1 and Rk2 based on root galling, and egg mass and egg production. The alkaloid content of flue-cured tobacco did not appear to have an effect on root-knot nematode parasitism under greenhouse or field conditions, but the presence of the nematode did lead to increased …
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Multiscale physics-based modeling of friction
… exhibit severe adhesion, cold welding and galling behavior as demonstrated experimentally in this work. If these behaviors are modeled at asperity-scale, then the friction at rough contact scale can be obtained by the same procedure presented in this work. This flexibility is another …
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Eco-physiological and molecular manipulation of leaf-level primary and secondary metabolism by arthropod herbivory
… among insect parasites and facilitates the galling habit by increasing competitive sink strength of the insect. The following chapters provide a framework for assessing how arthropod herbivores alter leaf function across damage type and plant species. By characterizing mechanisms within …
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