Corner Lot Research Articles

Regional and local vegetation community dynamics of the Eocene Okanagan Highlands (British Columbia – Washington State) from palynology

Palynofloras from the middle Early to early Middle Eocene Okanagan Highlands (northern Washington State and southern British Columbia) are used to reconstruct vegetation across a broad upland Eocene landscape. In this preliminary report, forest floristic composition is reconstructed using palynological analysis of sediments from Republic, Washington; localities of the Allenby Formation in the Princeton region (Hospital Hill, One Mile Creek and Summers Creek Road), Hat Creek, McAbee, Falkland, Horsefly, and Driftwood Canyon, British Columbia. Wind-dispersed taxa were dominant in all samples, consistent with floras preserved in lacustrine and paludal depositional environments. Pseudolarix was dominant in five of the floras, but Abies (Falkland) or Ulmus (Republic Corner Lot site) were dominant in individual samples for some floras. Betulaceae were dominant for McAbee (Alnus) and Allenby Formation (Betula), matching megafloral data for these sites. Some taxa common to most sites suggest cool conditions (e.g., Abies, other Pinaceae; Alnus, other Betulaceae). However, all floras contained a substantive broad-leaved deciduous element (e.g., Fagaceae, Juglandaceae) and conifers (e.g., Metasequoia) indicative of mesothermal conditions. Palms were only abundant in the Hat Creek coal flora, with very low counts recorded for the Falkland, McAbee, and Allenby Formation sites, suggesting that they were rare in much of the landscape and likely restricted to specialized habitats. Thermophilic (principally mesothermal) taxa, including palms (five sites) and "taxodiaceous" conifers, may have occurred at their climatic limits. The limiting factor controlling the regional distribution of thermophilic flora, which include primarily wetlands taxa, may be either climatic or edaphic.

A Brief History of Thyme: Cosmology on the Corner Lot

A Brief History of Thyme: Cosmology on the Corner Lot

Standing at the Crossroads

Standing at the CrossRoads Bryant Keith Alexander (bio) Standing at the crossroads, tried to flag a ride, Standing at the crossroads, tried to flag a ride, Ain’t nobody seem to know me, everybody passed me by. —Crossroad Blues I am the fifth child of seven children, the fourth boy of five boys. I was born into a social experiment that my parents called a family. In spite of the dynamic social interaction that goes on in a large family, I grew up a very private kid, constantly demanding his own space, his own place, his own identity—separate from my brothers (the athletic brother, the talented brother, the handsome brother, the younger brother). I always felt that I was at a crossroads between who I was and wanted to be and who they were, my biological brothers and my cultural brothers—and the directions that their lives were taking them. The house that I grew up in was located on a corner lot in the center of our neighborhood, at a crossroads between Simcoe Street and 12th Street. All the local kids flocked over to our house. My mother used to say, “with seven kids you’re bound to attract a lot more.” Our yard was the place to be. We had pecan trees and mulberry trees, a fig tree and a pine tree. We had a big front porch, an area for football and a dirt basketball court. This was the main attraction. Guys from around the neighborhood would come with their attitude and bravado, fighting over who would be shirts or skins. Sporting their new Converse tennis shoes, these guys would walk into our yard talking a whole lotta shit, who would win, by how many points and who would make it to the NBA. These Black guys performed the pageantry of youthful dreaming and the ritual of growing up. I watched the fellas from the side window, one of two in the living room of our house. I would watch them, young Olympians in the prime of their manhood—calling up the dirt, swirling in dust clouds of hopes and dreams. Their bodies were caked with a mixture of sweat, dirt and tenacity. The basketball court was a crossroads, a passage into another time, another space, a ticket to another place. The other window in the living room looked out the front. The house that I grew up in was located across the street from Syrie Funeral Home. During the evening I would often look through it and see the pageantry of death and the ritual of saying good-bye. In the distance I could hear the mournful wails of those feeling grief. I could see the old men sipping from a bottle of courage near the dumpster. I saw children doing what children do—some playing games, others engaged in solemn social [End Page 343] banter. I saw people looking silently, longingly into the distance, standing at the crossroads of their memories and their reality. On September 7, 1994, I drove from Carbondale, Illinois, to Lafayette, Louisiana, to attend the funeral of my brother Nathaniel Patrick Alexander, who had died from complications with AIDS three days earlier. Family members and friends asked why I didn’t fly, but I needed the time. In my informed confusion I thought that if I delayed getting there I could somehow suspend time. During that eleven hour drive I crossed real and imagined borders, traveling down a road that took me to painfully familiar places: The day he told me he was gay. The day he introduced me to a partner. The day he called me and said, “Are you coming home this summer?” The day I helped him move home. The day I found out he had AIDS. The day he said, “I’m sorry I let you down.” The day he said, “I love you.” The day he died. As I pulled into Lafayette, I reflected on another special day. After a name calling episode with some of the local boys in which I was the focus of their pro-masculine anti-sissy juvenile male posturing, my brother sat me down and said, “I see me in...

The Inward Bound Cemetery

Ad Libitum1 April 1990The Inward Bound CemeteryWalter B. Shelley, MD, PhD, E. Dorinda Shelley, MDWalter B. Shelley, MD, PhDSearch for more papers by this author, E. Dorinda Shelley, MDSearch for more papers by this authorAuthor, Article, and Disclosure Informationhttps://doi.org/10.7326/0003-4819-112-7-554 SectionsAboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinkedInRedditEmail ExcerptThe Place is Right:Underground living at its best.Once you see it, you'll be dying to get in.Open plots available—sleep under the stars.Choice corner lots for upright accommodations.Satisfaction guaranteed: St. Peter stands behind us.All units below frost line yet above the water table.Located on Sunset Boulevard (a charming dead end street).Convenient drop-off service entrance just off Shady Lane.Your stepping stone to the future and gateway to the Milky Way.The Price is Right:Buy now—be buried later.We undersell all competition.Plot ahead for dirt cheap burial.'Holesale rates. Group discounts.All... This content is PDF only. To continue reading please click on the PDF icon. Author, Article, and Disclosure InformationAffiliations: PreviousarticleNextarticle Advertisement FiguresReferencesRelatedDetails Metrics 1 April 1990Volume 112, Issue 7Page: 554-554KeywordsForecasting Issue Published: 1 April 1990 Copyright & Permissions© 1990 American College of PhysiciansPDF downloadLoading ...

The Influence of Turbine Clearance Gap Leakage on Passage Velocity and Heat Transfer Near Blade Tips: Part I—Sink Flow Effects on Blade Pressure Side

A study has been conducted to investigate influences of tip leakage flow on heat transfer and flow development along the pressure side of a gas turbine blade. An analysis of the sink character of the flow situation indicates that high velocities and accelerations are generated very near the gap, and an apparatus was specifically designed to model the phenomena and to permit resolution of the expected localized near-gap heat transfer enhancement. In the experiments, leakage flow was drawn from an adjustable stream wise corner slot in a straight square test channel. A thin stainless steel ohmic-heated test surface adjacent to the slot simulated the airfoil surface. Supporting nonintrusive mean and fluctuating flowfield measurements were conducted with a laser-Doppler anemometer to aid interpretation of the heat transfer results and to provide a basis for comparison with future numerical predictions. The flowfield measurements confirm that near the gap the flow is highly accelerated, and indicate apparent relaminarization of the initially turbulent boundary layer. The heat transfer measurements show that leakage generates large increases in local heating near the gap. The presence of this undesirable enhancement helps to explain observed in-service material distress and failures of blades that appear to initiate at the pressure side tip.

The Influence of Turbine Clearance Gap Leakage on Passage Velocity and Heat Transfer Near Blade Tips: Part II—Source Flow Effects on Blade Suction Sides

An experimental study has been designed and conducted to investigate turbine blade suction side heat transfer and flow near the tip clearance gap. Modeling of the phenomena was carried out in a water tunnel with injection through an adjustable streamwise corner slot in a square test channel. A thin stainless steel ohmic-heated test surface adjacent to the slot simulated the airfoil surface and permitted fine resolution of local heat transfer rates. Mean and fluctuating flow field measurements were conducted with a laser-Doppler anemometer to aid interpretation of the heat transfer results and to provide a basis for comparison with future numerical predictions. The results indicate that flow leakage from the turbine tip clearance gap into the suction side hot gas path results in more extensive and complex heat transfer effects than those measured for the blade pressure side in the companion Part I study. The character of the heat transfer andflow field deviations from closed gap conditions is strongly dependent on the particular combination of flow and geometry parameters present. The observed characteristics have been partitioned into categories of similar behavior, and the parameter combinations that define the boundaries between categories have been tentatively identified for the benefit of designers. The overall conclusions of this study and of the parallel study reported in Part I are that the effects of tip leakage flow on airfoil surface heat transfer near the blade tip can be very significant on both pressure and suction sides, and should be taken into account in blade cooling specification and design.

Methodology for Optimal Design of a Parking Lot

The design of an off-street parking facility, a corner lot surrounded by two streets intersecting at the corner, is described. The assumptions made in the study are described, and a step by step account is given of the derivation of the theoretical model. It was found that several patterns could be designed that gives the same maximum capacity. The best pattern is then selected through Ease, a measure of comfort to park in the lot and thus a factor of safety. The general features of the model used are several. The practical layout of the initial design is based on three priciples, the most important being that equations are general enough to handle any car size, any combination car sizes, and different angles in different regions. At present the model can be used for rectangular shapes of arbitrary lengths but a fixed width.

Subsea Template Drilling in the North Sea-Experience Gained During the Initial Stages of the Balmoral Development

Summary. Drilling offshore in hostile environments, such as the North Sea, presents a unique challenge, which is intensified when working over a presents a unique challenge, which is intensified when working over a subsea template. Operations, procedures, and experience relating to drilling through the Balmoral template are described. Special equipment and techniques-including cuttings disposal, cementing, and safety-are detailed, along with directional drilling, surveying, and cuttings disposal. An expensive low-toxicity oil-based mud was used for drilling operations, and a specially developed oil recovery system with a high-speed decanting centrifuge was constructed and installed to reduce costly losses. The system is described and its operational features are highlighted. Introduction The Balmoral field is a Paleocene reservoir lying some 7,000 ft [2100 m] below sea level in U.K. Block 16/21 in the central North Sea. The field was first discovered in 1975 and proved to be a marginal prospect after four appraisal wells were drilled. Because of the field size and the desire to ensure early oil production, a drilling/ production template, along with satellite wells, flexible risers, production template, along with satellite wells, flexible risers, and a floating production facility, were chosen as the optimum method of developing the field. Water depth at the location is 480 ft [146 m]. Plans to drill and to complete 10 template and 5 satellite wells over a 3-year period, in order to bring first oil ashore in early 1987, have been successfully implemented. Four existing satellite wells were also recompleted and all nine satellites tied into the template within the same time frame. This paper focuses on the first three template wells, Wells B1 through B3, and the 30-in. [76-cm] template conductors. The achievements discussed took place with the semisubmersible Western Pacesetter 1 from July 1984 to Feb. 1985 and constitute a considerable learning curve for the operator and contractors. Operations are currently under way on the fourth template well. Cuttings disposal, safety, directional surveying, rig movements between slots, securing of the template by the 30-in. [76-cm] conductors, blowout preventer (BOP) handling procedures, and tophole drilling-all related specifically to template drilling operations-are discussed. These topics and others peculiar to the Balmoral development, such as the casing program and the oil recovery system, are dealt with in their relevant sections. Conductors To expedite drilling operations and to ensure that the template was firmly secured in place, 30-in. 176-cm] conductors were batch set in all 14 template slots before the first well was begun. Permission to do this was granted by the U.K. Dept. of Energy. The operations were conducted over a 30-day period during Summer 1984. Careful consideration was given to the sequence of conductor placement so that the leveling of the template, which had previously been set to within 1/2 deg. [8.7 × 10 rad] of horizontal, would not be adversely affected. The four corner slots were cased initially, followed by alternate slots on each side of the template, beginning at the northeastern end. The pattern was varied slightly to ensure that the placement of the final conductor coincided with the first well to be drilled. The average time to drill, case, and cement was 36 hours. When moves between well bays-achieved by simply winching along the anchor chains-are included, the average time per slot was 51 hours. Navigation between slots was by visual observation of numbers painted on the well-bay funnel areas. Slot spacing is 14 ft [4.27 m] between centers, the overall template being 110 × 105 ft [33.5 × 32 m]. A schematic of the template layout is shown in Fig. 1. At the outset, concern was expressed regarding the centralization of the 36-in. [91-cm] bit and 9 1/2-in. [24-cm] bottom-hole assembly (BHA) inside the 40-in. [102-cm] -diameter well bay. Poor centralization could lead to crooked drilling of the top holes, particularly in face of potential cement-pan buildup as successive conductors potential cement-pan buildup as successive conductors were cemented in place. Even with 14-ft [4.27-m] spacing between well bays, it was essential to have a vertical or a slight outward lean on the conductors to facilitate later directional operations. In practice, all holes drilled easily in the soft sediments; cement buildup from adjacent casings presented no problem. A centralizer bushing on the 9 1/2-in. [24-cm] drill collars (DC's) was made available but was never needed. Throughout all 14 slots, the 30-in. [76-cm] bottom survey ranged from 0. 12 to 0.6 deg. [3.7 × 10 to 10.5 × 10 rad], giving departures between 0.04 and 1.25 ft [1.2 and 38 cm]. JPT P. 331

Computerized signal processing for detecting cracks under installed fasteners

This paper describes the development work on a computerized system designed to detect cracks by rotating a shear wave transducer around installed fasteners or bolt holes. Reflected ultrasonic signals from the cracks are digitized in 2° intervals, processed, and displayed in either polar or rectangular coordinates by the computer. Symmetrical noise resulting from an imperfect fit between the bolt and the hole is suppressed by a statistical digital rejection procedure which increases the signal to noise ratio. Corner slots of .051 × .051 and .025 cm and fatigue cracks under installed fasteners have been detected by this computerized system. Two promising methods to compute flaw sizes are also described in this paper.

The prevention of separation and flow reversal in the corners of compressor blade cascades

SummaryFrom tests on tunnel cascades one of the sources of loss in axial compressors could be corner stall, i.e. local separation of the flow in and near the corners between the annulus walls and the convex surfaces of the blades.Tests on a tunnel cascade at entry Mach numbers of 0·5 and 0·6 show that, at least in a tunnel, the stalling may be cured by boundary layer control. The present tests obtain control by suction through a corner slot. The tests show that removal through the slot of 1·3% of the flow decreases the total losses of the cascade by about 25%.A more detailed examination of the losses in the tunnel cascade without suction suggests that about three-quarters of the end losses are due to the separation and reverse flow. Much of the remaining end loss appears to result from the fact that the low energy stream tubes in the entry boundary layer would experience a disproportionately large increase in cross-sectional area during diffusion, even in attached two-dimensional flow. The suction corner control can eliminate the greater part of the end losses, by eliminating the separation.

Electromagnetic forces in slotted structures

The paper suggests a way of explaining the mechanism of force production in slotted structures which leads into a method of determining the precise location of these forces. The case of the rounded corner slot is also studied, and by the application of numerical techniques the fluxes at the boundary are integrated to study the force distribution in depth.

Deeds: Building Restriction: "Front Property Line" of Corner Lot

Deeds: Building Restriction: "Front Property Line" of Corner Lot