Nomenclator Generum et Familiarum Diplopodorum III. A list of the Genus-, Family-, and Ordinal-Group names proposed in the Class Diplopoda from 1 January 2000 ? 31 December 2014

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Effects of Longwall Mining on Hydrogeology, Leslie County, Kentucky Part 1: Pre-Mining Conditions

An investigation of the hydrologic effects of longwall coal mining is in progress in the Eastern Kentucky Coal Field. The study area is located in a first-order watershed in southern Leslie County over Shamrock Coal Company\u27s Beech Fork Mine (Edd Fork Basin on the Helton 7.5-minute quadrangle). Longwall panels approximately 700 feet wide are separated by three-entry gateways 200 feet wide. The mine is operating in the Fire Clay coal (Hazard No. 4); overburden thickness ranges from 300 to 1,000 feet. Mining in the watershed began in late summer 1993. Undermining of the instrumented panel (panel 7) is anticipated for summer 1994. This report documents pre-mining hydrogeologic conditions. Three sites over panel 7 (ridge-top, valley-side, and valley-bottom settings) were selected for intensive monitoring. An NX core hole was drilled at each site to provide stratigraphic control for well installation, to evaluate fractures, to conduct pressure-injection tests, and to provide a borehole for installation of time domain reflectometry cables. A rain gage and flume were installed in the basin in summer 1992. Twenty-four monitoring wells, completed in July 1992, provide water-level and water-quality data on individual stratigraphic zones represented by the three well locations. Interpretation of pre-mining conditions was used to develop a conceptual model of ground-water flow in the study basin. Three ground-water zones were identified on the basis of hydraulic properties. The shallow-fracture zone, a highly conductive region parallel to the ground surface, extends to a depth of 60 to 70 feet. The elevation-head zone includes the ridge interior, mostly above drainage, where total head consists of elevation head only. The pressure head zone, largely below drainage, is the region where total head is the sum of elevation head and pressure head. Two fresh-water geochemical facies are also present. Shallow ground water is a calcium-magnesium-bicarbonatesulfate type, whereas ground water in the deeper regional system is sodium-bicarbonate type. Anticipated effects from longwall mining include a decrease in water levels in the pressure-head zone. Temporary decreases are expected in the shallow-fracture zone as newly created void spaces subsequently fill. The elevation-head zone should not be greatly affected because it is predicted to be in the aquiclude zone

Effects of Longwall Mining on Hydrogeology, Leslie County, Kentucky Part 3: Post-Mining Conditions

The effects of longwall coal mining on hydrology in the Eastern Kentucky Coal Field have been investigated since 1991. The study area is in the Edd Fork watershed in southern Leslie County, over Shamrock Coal Company\u27s Beech Fork Mine. Longwall panels approximately 700 ft wide are separated by three-entry gateways that are approximately 200 ft wide. The mine is operated in the Fire Clay (Hazard No. 4) coal; overburden thickness ranges from 300 to 800 ft. Mining began in panel 1 in September 1991 and concluded with panel 8 in September 1994. Long-term monitoring consisting of a network of piezometers and time-domain reflectometry (TDR) cables previously installed over panel 7, in conjunction with a continuously recording rain gage and flume, began after the completion of mining. Two new core holes were drilled over panel 7 approximately 1 year after mining ceased in panel 8 to determine depth of collapse and hydraulic conductivity of strata. Water levels were measured in two new monitoring wells installed after mining to complement the 11 piezometers installed prior to mining that were still functioning. Precipitation was measured through July 1996, and streamflow was measured in Edd Fork on a monthly basis using a cross-section gaging method. Physical failure of piezometers, core drilling, and the movement of air into deeper piezometers after mining indicate that extensive fracturing occurred to a height of 450 ft above the mine, which is approximately 60 times the extracted coal-seam thickness. Hydraulic conductivity values determined from pressure-injection tests were 10 to 100 times greater after mining than before mining; many values were in the range of 10-2 to 10-4 ft/min for all lithologies. At a minimum, a zone of rock approximately 200 ft above the mined coal was dewatered beneath Edd Fork. Ground-water levels in ridgetop piezometers fluctuated slightly more after mining than they did before, which indicates that the upper part of the ridge is more hydraulically connected to surface recharge from precipitation since mining took place. The existence of ground water in the shallow ridgetop piezometers suggests that an underlying aquitard zone developed during mine collapse, which retards the downward movement of shallow ground water to the mined-out area. Water level declined in a sandstone unit approximately 300 ft above the mine after mining, but recovered within a year. This indicates that the underlying regional aquitard still retards downward ground-water movement, despite the hydraulic conductivity of the unit increasing 100 times after mining. Edd Fork, approximately 375 ft above the mine in panel 7, resumed surface flow 2 months after completion of mining; however, flow diminishes downstream at about the centerline of panel 8. Mining is still active in other areas of the mine, and mechanical dewatering activities will most likely keep water levels in the deep zones artificially depressed in the study area until mining is completed and dewatering activities cease

Effects of Longwall Mining on Hydrology, Leslie County, Kentucky Part 2: During-Mining Conditions

The effects of longwall coal mining on hydrology in the Eastern Kentucky Coal Field are being investigated. The study area is in the Edd Fork watershed in southern Leslie County, over Shamrock Coal Company\u27s Beech Fork Mine. Longwall panels approximately 700 ft wide are separated by three-entry gateways that are approximately 200 ft wide. The mine is operated in the Fire Clay (Hazard No. 4) coal; overburden thickness ranges from 300 to 800 ft. Mining began in panel 1 in September 1991 and concluded with panel 8 in September 1994. Long-term monitoring consisting of a network of piezometers and time-domain reflectometry (TDR) cables previously installed over panel 7, in conjunction with a continuously recording rain gage and flume, is continuing after the completion of mining. Mining in panel 5 affected water levels in three of 24 piezometers installed over panel 7; the level went down in one piezometer and rose in two. Mining in panel 6 affected 16 of 24 piezometers; the level went down in 11 piezometers and rose in five. Mining in panel 7 affected water levels in 20 of 24 piezometers. Different water-level responses were recorded as the mine approached and passed by the instrumental sites. Thirteen piezometers failed as a result of undermining. These piezometers penetrated the zone of deep fracturing that extends upward approximately 450 ft (or 60 times greater than the mined thickness) above the mine. Only one piezometer showed a net increase in water level as a result of mining. Mining-induced surface fractures, observed along roads in the watershed, were generally parallel to the slope of the land surface or mining direction and probably contributed to ground-water recharge. The surface stream was unaffected until it was undermined by panel 8; then the stream went dry. TDR cables in the Hazard coal zone were deformed as mining passed by on the adjacent panel. Water levels in piezometers in the Hazard coal zone declined at the same time. TDR cables broke completely twice. The deepest complete break was in the Hazard coal zone and occurred when the active mine face was approaching, but still approximately 1,000 ft away from, the affected cable in panel 7. This corresponds to an angle of influence of 60 to 70°. Rock broke in the shallow subsurface (less than 50 ft deep) when the cable was directly undermined. Water-level responses in piezometers adjacent to mining are related to the complex flow system, rather than a defined angle of hydrologic influence. Coal beds and other conductive strata transmit water-level responses as far away as 1,450 ft, whereas nonconductive strata transmit little water-level change at closer distances. The water-level responses observed in this study support existing subsidence models. Piezometers in the zone of intensive fracturing failed as a result of rock breakage. An aquiclude zone developed in the ridge. The integrity of strata and piezometers was generally maintained. The most variable effects were observed in the zone of surface fracturing, within 50 ft of the surface

Attracting Manifold for a Viscous Topology Transition

An analytical method is developed describing the approach to a finite-time singularity associated with collapse of a narrow fluid layer in an unstable Hele-Shaw flow. Under the separation of time scales near a bifurcation point, a long-wavelength mode entrains higher-frequency modes, as described by a version of Hill's equation. In the slaved dynamics, the initial-value problem is solved explicitly, yielding the time and analytical structure of a singularity which is associated with the motion of zeroes in the complex plane. This suggests a general mechanism of singularity formation in this system.Comment: 4 pages, RevTeX, 3 ps figs included with text in uuencoded file, accepted in Phys. Rev. Let

Magnetization of ferrofluids with dipolar interactions - a Born--Mayer expansion

For ferrofluids that are described by a system of hard spheres interacting via dipolar forces we evaluate the magnetization as a function of the internal magnetic field with a Born--Mayer technique and an expansion in the dipolar coupling strength. Two different approximations are presented for the magnetization considering different contributions to a series expansion in terms of the volume fraction of the particles and the dipolar coupling strength.Comment: 19 pages, 11 figures submitted to PR

The Lantern Vol. 3, No. 1, December 1934

• Magic Words • The Old Trappe Church • The Light of Life • Edwin Markham: Impressions • Increment (A Christmas Thought) • Our Christmas • What Price Forgetting? • Autumn • The Old Parson • Zacharias Ursinus • Inspiration • A Scrap-Book of Memories • A Campus Saunterhttps://digitalcommons.ursinus.edu/lantern/1004/thumbnail.jp

Controls on Dissolved Cobalt in Surface Waters of the Sargasso Sea: Comparisons with Iron and Aluminum

Dissolved cobalt (dCo), iron (dFe) and aluminum (dAl) were determined in water column samples along a meridional transect (∼31°N to 24°N) south of Bermuda in June 2008. A general north-to-south increase in surface concentrations of dFe (0.3-1.6 nM) and dAl (14-42 nM) was observed, suggesting that aerosol deposition is a significant source of dFe and dAl, whereas no clear trend was observed. for near-surface dCo concentrations. Shipboard aerosol samples indicate fractional solubility values of 8-100% for aerosol Co, which are significantly higher than corresponding estimates of the solubility of aerosol Fe (0.44-45%). Hydrographic observations and analysis of time series rain samples from Bermuda indicate that wet deposition accounts for most (\u3e80%) of the total aeolian flux of Co, and hence a significant proportion of the atmospheric input of dCo to our study region. Our aerosol data imply that the atmospheric input of dCo to the Sargasso Sea is modest, although this flux may be more significant in late summer. The water column dCo profiles reveal a vertical distribution that predominantly reflects nutrient-type behavior, vs. scavenged-type behavior for dAl, and a hybrid of nutrient- and scavenged-type behavior for dFe. Mesoscale eddies also appear to impact on the vertical distribution of dCo. The effects of biological removal of dCo from the upper water column were apparent as pronounced sub-surface min. (21 ± 4 pM dCo), coincident with maxima in Prochlorococcus abundance. These observations imply that Prochlorococcus plays a major role in removing dCo from the euphotic zone, and that the availability of dCo may regulate Prochlorococcus growth in the Sargasso Sea

Rethinking the social impacts of the arts

The paper presents a critical discussion of the current debate over the social impacts of the arts in the UK. It argues that the accepted understanding of the terms of the debate is rooted in a number of assumptions and beliefs that are rarely questioned. The paper goes on to present the interim findings of a three‐year research project, which aims to rethink the social impact of the arts, with a view to determining how these impacts might be better understood. The desirability of a historical approach is articulated, and a classification of the claims made within the Western intellectual tradition for what the arts “do” to people is presented and discussed