Advances in the surface defect machining (SDM) of hard steels

This paper reports the realisation of precision surface finish (Ra 30 nm) on AISI 4340 steel using a conventional turret lathe by adapting and incorporating a surface defect machining (SDM) method [Wear, 302, 2013 (1124-1135)]. Conventional ways of machining materials are limited by the use of a critical feed rate, experimentally determined as 0.02 mm/rev, beyond which no appreciable improvement in the machined quality of the surface is obtained. However, in this research, the novel application of an SDM method was used to overcome this minimum feed rate limitation ultimately reducing it to 0.005 mm/rev and attaining an average machined surface roughness of 30 nm. From an application point of view, such a smooth finish is well within the values recommended in the ASTM standards for total knee joint prosthesis. Further analysis was done using SEM imaging, white light interferometry and numerical simulations to verify that adapting SDM method provides improved surface integrity by reducing the extent of side flow, microchips and weldments during the hard turning process.

Characterisation of the performance of sustainable grout containing bentonite for geotechnical applications

The grouts used in sealing or backfilling boreholes should ideally be selected to be compatible with the insitu field instruments installed in the borehole and also be engineered to match closely the geotechnical properties of the parent soils. A stable grout can be made using cement with various proportions of bentonite. The grout stability is very important during both the liquid and set conditions. The liquid grout fluidity should be as viscous as possible to avoid segregation, yet fluid enough to be easily pumpable and fill voids and over-break in the borehole. This paper investigates the effect of bentonite on the fresh and rheological properties of cement-based grouts in order to develop a stable grout to be used in these geotechnical situations. These properties were evaluated by the mini-slump flow, marsh cone flow time, Lombardi plate cohesion meter, static bleeding, yield stress and plastic viscosity values. Additionally, the compressive strength at 3 days, 7 days and 28 days were also investigated. The key parameters investigated were the dosages of bentonite and water-to-binder ratio (W/B). Test results showed that the dosage of bentonite had a significant effect on the fluidity, rheological properties and compressive strength of grout. The increase in the dosage of bentonite led to increasing the values of flow time, plate cohesion meter, yield stress and plastic viscosity, and reducing the mini-slump results, the static bleeding and the compressive strength at 3 days, 7 days and 28 days. Conversely, the increase in W/B led to decreasing the values of flow time, plate cohesion meter, yield stress, and plastic viscosity and the compressive strength, while increasing the mini-slump results and bleeding. Some recommendations for suitable mix proportions for use in soil boreholes are made.

Imaging and radiation effects of gold nanoparticles in tumour cells

Gold nanoparticle radiosensitization represents a novel technique in enhancement of ionising radiation dose and its effect on biological systems. Variation between theoretical predictions and experimental measurement is significant enough that the mechanism leading to an increase in cell killing and DNA damage is still not clear. We present the first experimental results that take into account both the measured biodistribution of gold nanoparticles at the cellular level and the range of the product electrons responsible for energy deposition. Combining synchrotron-generated monoenergetic X-rays, intracellular gold particle imaging and DNA damage assays, has enabled a DNA damage model to be generated that includes the production of intermediate electrons. We can therefore show for the first time good agreement between the prediction of biological outcomes from both the Local Effect Model and a DNA damage model with experimentally observed cell killing and DNA damage induction via the combination of X-rays and GNPs. However, the requirement of two distinct models as indicated by this mechanistic study, one for short-term DNA damage and another for cell survival, indicates that, at least for nanoparticle enhancement, it is not safe to equate the lethal lesions invoked in the local effect model with DNA damage events.

Median Filter Architecture by Accumulative Parallel Counters

The time to process each of the W/B processing blocks of a median calculation method on a set of N W-bit integers is improved here by a factor of three compared with literature. The parallelism uncovered in blocks containing B-bit slices is exploited by independent accumulative parallel counters so that the median is calculated faster than any known previous method for any N, W values. The improvements to the method are discussed in the context of calculating the median for a moving set of N integers, for which a pipelined architecture is developed. An extra benefit of a smaller area for the architecture is also reported.

1964-65 Board of Governors

The 1964-65 Board of Governors. Pictured here are those who attended the first meeting on December 8, 1964. From left to right - Front Row: E. E. Mitchelson, Niagara Falls. Mrs. J. J. Bench, St. Catharines. W. B. Gunning, Chippawa. Dr. J. A. Gibson, St. Catharines. D. G. Willmot, St. Catharines. J. M. Trott, Welland. C. B. Hill, St. Catharines. A. C. Rae, Fonthill. Back Row: E. S. Howard, Fort Erie. W. J. Freeman, Port Colborne. M. L. Swart, Thorold. C. F. Anderson, Port Colborne. W. S. Martin, Queenston. E. R. Davey, Niagara Falls. R. L. Hearn, Queenston. C. W. Morehead, Welland. S. J. Leishman, Thorold. F. H. Leslie, Chippawa. F. C. Cullimore, Chippawa. W. B. C. Burgoyne, St. Catharines. H. C. Blenkhorn, St. Catharines. M. A. Chown, St. Catharines. B. P. R. Newman, St. Catharines. R. S. Misener, St. Catharines. Missing: R. M. Schmon, Niagara on the Lake. E. J. Barbeau, St. Catharines. P. E. Roberts, Toronto. L. R. Williams, Welland.

Founders Committee

Members of the Founders' Committee. Pictured here in a clockwise fashion from the left are: R. L. Hearn, W. J. Freeman, M. A. Chown, M. L. Swart, C. Bruce Hill, C. B. Slemon, Dr. James A. Gibson, D. G. Willmot, J .M. Trott, A. C. Rae, W. B. C. Burgoyne, E. S. Howard, L. R. Williams, S. J. Leishman, E. J. Barbeau, and E. R. Davey. Missing from the photo were: W. B. Gunning, W. S. Martin, C. W. Morehead, and B. P. R. Newman.

President Chosen

A special meeting of several Founders Committee members took place at Arthur A. Schmon's House in Niagara on the Lake immediately after the announcement in September of 1963 that Dr. James Alexander Gibson would be the first president of Brock University as of January 1964. Pictured here from left to right are: Mr. W. B. C. Burgoyne, Mr. D. G. Willmot, Dr. J. A. Gibson, Dr. A. A. Schmon, Mr. E. J. Barbeau, Dr. S. H. Deeks, and Mr. C. W. Morehead.

Account book from the Wilcox Estate, 1882-1886

This may be the account book of someone in the wholesale dry goods or grocery business. The account book includes balance sheets for a Waterford store and a Dunnville store. The accounts include clients from several southwestern Ontario communities. Names include Leitch, Turner, Auger, McKim, Beatty, Hewetson, Murton, Bell, Greig, Duggan, Kirk, and Logie. Local Niagara names include: W.B. Chambers of Welland and B.F. Morely of Thorold. Also includes deposit accounts held with Traders Bank of Canada and investments in the Temperance Colonization Society.

Second Welland Canal - Book 1, Survey Map 11 - St. Catharines and Locks 3 and 4

Survey map of the Second Welland Canal created by the Welland Canal Company showing the Town of St. Catharines. Identified structures associated with the Canal include Lock 3 and its Lock House, Lock 4 and its Lock House, Hydraulic Race, and a floating tow path. The surveyors' measurements and notes can be seen in red and black ink and pencil. Local area landmarks are also identified and include streets and roads (ex. Geneva Street, Ontario Street, St. Paul Street, and Merritville Road), Lincoln Mills and its Store House, T. M. Merritt's Store House, Cooper Shop, L. Shickluna's Dry Dock, Peter McGill's Grist Mill, J. Flint's Saw Factory, T. Hosteter's Gristing Mill, J. Dougan Builder's shop or office, Norris and Nelson Mill, G. N. Oil Foundry and its Machine Shop and Boiler, a barrel shed, woolen factory, Estate of P. Nihen (or T. Nihan), Norris and Nelson's Wharf, the W. C. Office, and structures (possibly houses) or small properties belonging to T. Adams, and A. K. Boomer. Properties and property owners of note are: Concession 6 Lots 16, 17, and 18, Concession 7 Lots 16, 17, and 18, Alva Dittrick, James R. Benson, W. B. Robinson, and C. Phelps.

Second Welland Canal - Book 2, Survey Map 6 - Locks 19, 20, 21 and 22 in Grantham

Survey map of the Second Welland Canal created by the Welland Canal Company showing south Merritton along the boundary between the Grantham and Thorold Townships. Identified structures associated with the Canal include Locks 19, 20, 21, and 22, Lock Tenders House, and the towing path. The surveyors' measurements and notes can be seen in red and black ink and pencil. Local area landmarks are also identified and include streets and roads (ex. Pine Street and Macadamized Road), J. Brown Cement Mill, W. B. Hendershot Saw Mill, W. Parnall Spoke and Sash Factory, W. Beatty Saw Mill, W. Beatty Tannery, a number of structures (possibly houses) belonging to: Mrs. Aikins, J. Battle, and E. Keefer, and a foundry, smithy, and machine shop (all of which possible belonged to J. Dobbie). Properties and property owners of note are: Concession 10 Lots 9 and 10, W. C. Loan Company, P.H. Ball, and J. Keefer. Two small properties belonging to W. B. Hendershot and W. Beatty exist and are outlined in red. A half acre property reserved for a lock lot exists and is outlined in blue. An additional property reserved for a quarry is also identified, but not outlined.

Second Welland Canal - Book 2, Survey Map 7 - Locks 23, 24 and 25 in Thorold

Survey map of the Second Welland Canal created by the Welland Canal Company showing the canal as it passes through the Village of Thorold. Identified structures associated with the Canal include Locks 23, 24, and 25, a Guard Gate, Lock House Lot, the Little Deep Cut, and the towing path. The surveyors' measurements and notes can be seen in red and black ink and pencil. Local area landmarks are also identified and include streets and roads(ex. Pine Street and Front Street), a basin, a mill race, McPherson and Wier's Grist Mill, Brown and Ross Flouring Mill, R. James Store, J. Brown Cement Mill, W. B. Hendershots Store, Keefers Mill, J. Woodward Grist Mill, Brierly McWhirter and Co. Cotton Mill, E. W. Stephenson Tavern, a factory and a saw mill on W. H. Ward's property, a flouring mill, engine house, a store house, several barns, J. Brown's Wharf, and a number of structures belonging to: Jenkinson, Mrs. McCarty, John Clay, M. McDonnah, Mrs. Donahoc, W. B. Hendershott, Mrs. Pawling, and Christy. Properties and property owners of note are: Lots 8, 9, 16, and 17, W. H. Ward, J. Keefer, G. Keefer Jr., G. Keefer Sr., Dr. Rolls, W. Hendershott, Cleveland, Lucy, and R. Leeper.

Second Welland Canal - Book 2, Survey Map 14 - Lock 26 and Allanburgh

Survey map of the Second Welland Canal created by the Welland Canal Company showing the canal as it passes through the Village of Allanburgh. Identified structures and features associated with the Canal include Lock 26, a Guard Lock, Lock Tender's House, the New Cut, waste wear, and the towing path. Parts of the old canal are indentified and include Old Lock 36 and 37, and the Old Cut. The surveyors' measurements and notes can be seen in red and black ink and pencil. Local area landmarks are also identified and include streets and roads (ex. Holland Road, Centre Street, Falls Street, Canal Street, and Clifton Street), Allanburgh Hotel, Rannies Store, Wright and Duncan Grist Mill, A. Vanderburgh Saw Mill, W. Pennock Shingle Factory, John Harper Tavern, a very delapitated Grist and Saw Mill, store house, a shanty, and a number of other structures - some of which are identified by their owners: A. Vanderburgh, W. Wright, C. Brent, and H. Mussen. Properties and property owners of note are: Lots 118 and 119, Captain Creighton, and William H. Merritt Jr. A number of small properties labeled 1 through 39 are present and of these 6 - 15 are reserved for a Mill Site and are outlined in red. Several other pieces of land are outlined in blue and belong to: W. B. Hendershot, P. Finlay, W. Wright, and L. Leslie. There is also a piece of land reserved for hydraulic purposes.

Second Welland Canal - Book 3, Survey Map 12 - Village of Welland

Survey map of the Second Welland Canal created by the Welland Canal Company showing the canal in the Village of Welland. Identified structures and features associated with the Canal include the towing path, the old canal, the aqueduct lock, the new aqueduct, the old aqueduct, Lock Tenders House, a waste weir, culvert, covered drain, drain, dam, flume, and the canal's New Line. The surveyors' measurements and notes can be seen in red and black ink and pencil. Local area landmarks are also identified and include bridges, roads, and streets (ex. Division Street and Main Street), Chippewa Creek, Mill Pond, Mill Race, Court House and Gaol, Seeley (Seely) and Dunlop Saw Mill, Seeley (Seely) and Dunlop (Burnt) Grist Mill, Montrose Grist Mill, M. Caferty (Cafferty) City Hotel, Welland House by Wilkerson, Eli Mead Wharf Lot, A. Sherwood Wharf Lot, D. P. Myers Store, M. Cook Grist Mill, A. H. Cosby Saw Mill, Betts Lumber Yard, T. Quinn Tavern, a Carding Mill, shed, several barns, a hotel, and several structures or properties belonging to: J. P Evans, W. A. Phillips, S. Hampton, M. Silverthorne, D. McEwing, W. B. Hendershott (Hendershot), T. Burgar, J. Brookfield, A. Hendershott, Joseph Burgar, C. Demrie, M. Cafferty, J. Spencer, Mrs. Curran, John Lemon, D. Cooper, H. A. Rose, J. Bridges, A. Chapman, and R. Morewood. A structure belonging to a D. McKelly or McKully, and a store belonging to a J. Fino or Finn are also present. Properties and property owners of note are: Lots 247 and 248 of the Thorold Township, 5th Concession Lots 26 and 25 of the Crowland Township, Smith Shotwell, Eli Mead, D. P Myers, Donaldson, McFarland, Mrs. Silverthorne, Price, and Griffth. A County Court House Lot containing the Court House, Gaol and Gaol Yard is present.