Ohio Journal of Science: Volume 94, Issue 5 (December, 1994)

Permanent URI for this collection

Front Matter
pp. 0
Article description | Article Full Text PDF (1249KB)

Editorial
Meserve, Lee A. pp. 123-123
Article description | Article Full Text PDF (121KB)

Interregional Trade: Adjunct to Innovation
Janson, Richard W. pp. 124-133
Article description | Article Full Text PDF (1340KB)

General Public Awareness of Sources of Radiation in Their Environment
Mancl, Karen M.; Heimlich, Joseph; Fentiman, Audeen; Christensen, Richard pp. 134-137
Article description | Article Full Text PDF (1423KB)

Ground-Water Contribution from the Silurian/Devonian Carbonate Aquifer to the Mad River Valley, Southwestern Ohio
Sheets, Rodney A.; Yost, William P. pp. 138-146
Article description | Article Full Text PDF (3825KB)

The Unionid Mussel Fauna of Pymatuning Creek in Ashtabula County, Ohio, Including the Federally Endangered Clubshell (Pleurobema clava)
Huehner, Martin K.; Corr, Cathy L. pp. 147-150
Article description | Article Full Text PDF (933KB)

Conventional Machining of Green Aluminum/ Aluminum Nitride Ceramics
Scheller, W. L., II pp. 151-154
Article description | Article Full Text PDF (935KB)

Book Reviews
pp. 155-155
Article description | Article Full Text PDF (441KB)

Obituaries of the Members of the Ohio Academy of Science: Report of the Necrology Committee, 1994
pp. 159-172
Article description | Article Full Text PDF (2028KB)

The Ohio Academy of Science: Officers, Committees, Academy Representatives, and Governing Council for 1994-95
pp. 173-173
Article description | Article Full Text PDF (86KB)

Author and Subject Index to Volume 94
pp. 174-180
Article description | Article Full Text PDF (558KB)

The Ohio Journal of Science Table of Contents --Volume 94
pp. 181-182
Article description | Article Full Text PDF (90KB)

Back Matter
pp. 999
Article description | Article Full Text PDF (664KB)

Browse

Recent Submissions

Now showing 1 - 13 of 13
  • Item
    Back Matter
    (1994-12)
  • Item
    Book Reviews
    (1994-12)
  • Item
    Conventional Machining of Green Aluminum/ Aluminum Nitride Ceramics
    (1994-12) Scheller, W. L., II
    Current methods for producing ceramic parts rely on finish machining using diamond creep feed grinding or some other non-traditional machining method. As a result, machining may represent as much as 90% of the cost of some ceramic parts. This research project focused on creating dimensionally accurate parts made from green engineering ceramic bodies. These bodies were designed to be reaction sintered. Reaction sintering is a method which drastically reduces shrinkage, from about 20% to about 1%. This project investigated the use of conventional milling to machine ceramic green bodies. The green bodies, consisting of 80% aluminum and 20% aluminum nitride, were machined under feed, speed, and depth of cut conditions designed as a 23 factorial experiment. Also, green bodies of 20% aluminum and 80% aluminum nitride were prepared, presintered, and machined. The key measurements taken were the number of chips on the machined geometries of the green body caused by the mill. In the 23 factorial experiment all green bodies exhibited chipping when subjected to drilling and milling. Feed, speed, and depth of cut were found not to be significant in chipping. The machined presintered bodies did not exhibit any chipping when machined.
  • Item
    The Unionid Mussel Fauna of Pymatuning Creek in Ashtabula County, Ohio, Including the Federally Endangered Clubshell (Pleurobema clava)
    (1994-12) Huehner, Martin K.; Corr, Cathy L.
    A survey of union ids in Pymatuning Creek in Ashtabula County, OH, was conducted to assess the species present and their relative abundances, with particular attention to the federally endangered Clubshell (Pleurobema clava). Sampling the stream bed by hand at 18 locations produced 3,464 living and 501 dead unionids comprising 11 different species. At each site, data were collected for substrata types, and water depth, speed, temperature, pH, and oxygen concentration were measured. The mussel fauna consisted of two dominant species (JElliptio dilatata and Amblema plicata), three subdominants (Lasmigona complanata, Anodonta grandis grandis, and Ixi tufts His radiata luteola), and six uncommon species (Pleurobema clava, Lasmigona costata, Lasmigona compressa, Anodontoides ferussacianus, Anodonta imbecillis, and Villosa iris iris), listed in order of abundance. Living specimens of P. clava were found in habitats that were characterized by shallow water, good oxygenation, little organic debris, moderate current, and substrata consisting mostly of sand with fine pebbles. The relative abundance of mussels averaged 1.783 mussels found per minute of search time and ranged from 0.225 to 4.390, while previous studies of the Cuyahoga River yielded an average relative abundance of 0.469 mussels per minute of searching. The present survey indicates that Pymatuning Creek supports a large and vigorous population of unionids, and that P. clava comprises a small but healthy element of that fauna and may constitute Ohio's largest population of this endangered species.
  • Item
    Ground-Water Contribution from the Silurian/Devonian Carbonate Aquifer to the Mad River Valley, Southwestern Ohio
    (1994-12) Sheets, Rodney A.; Yost, William P.
    The U.S. Geological Survey Regional Aquifer-System Analysis is examining the Silurian and Devonian carbonate aquifer and overlying glacial deposits of western Ohio and eastern Indiana in terms of the hydrogeologic framework, ground-water-flow system and water chemistry, and response to withdrawals and development. This paper describes the hydrogeology of an area in southwestern Ohio that contains the Mad River Valley, an outwash valley that is incised through the relatively permeable Silurian bedrock into the relatively impermeable Ordovician bedrock at the southern boundary of Silurian rocks. Ground-water-flow patterns based on a synoptic water-level survey of 80 bedrock wells in the Silurian and Devonian carbonate aquifer indicate that flow is toward the valley. A ground-water basin was delineated from the potentiometricsurface map and used in conjunction with a low-flow gain-loss study to derive a generalized ground-water/surface-water budget for the area. Results of this budget indicate that ground-water recharge rates through the ground moraine to the carbonate aquifer range from 4 to 6 in/yr (10-15 cm/yr) and that approximately 60 to 80% of the base flow in the Mad River may ultimately consist of ground water derived from the Silurian and Devonian carbonate aquifer. Previous studies of surface- and ground-water chemistry in the area also support the conclusion that the Mad River Valley functions as a discharge area for the surrounding carbonate aquifer. Results of this study can be useful in characterizing ground-water flow and recharge rates for the Silurian and Devonian carbonate and valley aquifers along the southern boundary of this extensive regional aquifer system.
  • Item
    General Public Awareness of Sources of Radiation in Their Environment
    (1994-12) Mancl, Karen M.; Heimlich, Joseph; Fentiman, Audeen; Christensen, Richard
    A telephone survey (poll) of randomly selected Ohio citizens was conducted to determine their awareness and knowledge of sources of radiation in their environment. During October 1992, 1,450 households were contacted resulting in 879 complete interviews. Nearly half of those Ohio citizens surveyed have heard something about disposal of low-level radioactive waste. Knowledge about radiation exposure and sources was found to be related to general education level. College graduates tend to be slightly more aware of sources and exposure than adults with less than a high school education. Radiation exposure from bricks used in buildings, flying in an airplane, and smoke detectors was identified by fewer than 20% of respondents overall.
  • Item
    Interregional Trade: Adjunct to Innovation
    (1994-12) Janson, Richard W.
  • Item
    Editorial
    (1994-12) Meserve, Lee A.
  • Item
    Front Matter
    (1994-12)