A Time Comparison of Computer-Assisted and Manual Bathymetric Processing

We describe an experiment designed to determine the time required to process Multibeam Echosounder (MBES) data using the CUBE (Combined Uncertainty and Bathymetry Estimator) [Calder & Mayer, 2003; Calder, 2003] and Navigation Surface [Smith et al., 2002; Smith, 2003] algorithms. We collected data for a small (22.3xl06 soundings) survey in Valdez Narrows, Alaska, and monitored person-hours expended on processing for a traditional MBES processing stream and the proposed computer-assisted method operating on identical data. The analysis shows that the vast majority of time expended in a traditional processing stream is in subjective hand-editing of data, followed by line planning and quality control, and that the computer-assisted method is significantly faster than the traditional process through its elimination of human interaction time. The potential improvement in editing time is shown to be on the order of 25-37:1 over traditional methods

The Milkman\u27s Rag

Portrait of Shep Camphttps://scholarsjunction.msstate.edu/cht-sheet-music/13787/thumbnail.jp

Mosaic: An Interdisciplinary Critical Journal Special Issue Call for Papers: Numbers

Mosaic, an interdisciplinary critical journal, is pleased to announce a call for papers for a special issue on Numbers. Please submit your essay to the Editor using Mosaic’s online submission portal (http://umanitoba.ca/mosaic/submit) by March 9, 2018. The issue is currently scheduled to appear in September 2019

Subterranean Politics Blues

Reviewing: Stephen B. Burbank & Sean Farhang, Rights and Retrenchment: The Counterrevolution Against Federal Litigation; Karen Orren & Stephen Skowronek, The Policy State: An American Predicamen

Kalbančios knygos: naujas požiūris į bibliokriminalistiką

Bibliographers are trained in the forensics of the material book and consider every material component as a piece of evidence assembled for a ‘Crime Scene Investigation.’ But what if the books themselves could talk? How can we tell research-informed, imaginatively-inspired stories that reanimate objects when confronted with the wholesale destruction of buildings, material goods and business records as a result of war? Drawing on research on the nineteenth-century book trades in Southampton, this paper enacts a new model of situated knowledges to question our current biblioforensic practices. It proposes that archival loss enables book historians to reconsider our relationship with our objects of study and opens the door to new forms of archival encounter as well as new forms of scholarly expression.Bibliografai yra parengti popierinių knygų kriminalistikai ir kiekvieną materialią sudedamąją dalį laiko įrodymu, surinktu „nusikaltimo vietos tyrimui“. Tačiau kas nutiktų, jei pačios knygos prabiltų? Kaip galėtume papasakoti moksliniais tyrimais pagrįstas, vaizduotės įkvėptas istorijas, kurios atgaivina tyrimo objektus, kai susiduriama su didelio masto karo sukeltu pastatų, materialiųjų vertybių ir verslo dokumentų sunaikinimu? Remiantis XIX amžiaus prekybos knygomis Sautamptone tyrimais, šiame darbe pateikiamas naujas tam tikromis sąlygomis egzistuojančių žinių modelis, leidžiantis suabejoti mūsų dabartine bibliokriminalistikos praktika. Jame teigiama, kad archyvų praradimas leidžia knygų istorijos specialistams persvarstyti mūsų santykį su mūsų tyrimo objektais ir atveria duris naujoms netikėto susitikimo su archyvine medžiaga bei mokslinės raiškos formoms

Yellow Perch, Perca Flavescens, Growth and Survival on Different Feeds and in Low Salinity Environments

The development of effective culture techniques in the rearing of yellow perch (Perca flavescens) (Mitchill 1814) has multi-lateral benefits including enriching recreational resources, helping conservation efforts, as well as providing quality sea-food production. A myriad of challenges is yet to be remediated if yellow perch aquaculture is going to prosper. One of the challenges that hinders yellow perch aquaculture is the lacking supply of high-quality fingerlings. With current techniques employed by yellow perch hatcheries, the survival of yellow perch up to 30-day post hatch (DPH) age is typically less than 10%. Furthermore, larval culture has depended on imported dry feed developed for other species of fish, as well as live feed (artemia nauplii, rotifers, and even copepods), which may not be specific to yellow perch. Thus, it is critical to investigate new hatchery techniques and diets to increase larval survival during their early life stages. The overall goal of this research is to increase the yellow perch production efficiency by developing new culture techniques for yellow perch hatchery and fingerling production. Three experiments were completed in this study. The objective of the first experiment was to determine the best feeding practices for the yellow perch. For this, yellow perch larvae were fed artemia which had undergone a decapsulation process, artemia which had not, as well as two formulated dry diets. These consisted of a popular commercial larval fish feed and a lab formulated larval feed. The live feed was fed in combination with dry feed as well. The diets were fed from 16 DPH to 30 DPH. The results showed that live feed performed better than the dry feeds in larval fish survival (p\u3c0.05), but the decapsulated artemia had the best overall individual weight gain among live feeds. This suggests that, while non-decapsulated artemia can maintain larval perch survival, the larval perch may not be able to fully digest the unsoftened artemia, leading to less growth. The objective of this next study was to assess whether 5-ppt saltwater had any effects on yellow perch embryos, as well as larval growth and survival, if used as an alternative to formalin for pathogen control. The conditions during embryo incubation were: Freshwater with formalin, 5-ppt saltwater with formalin, and 5-ppt saltwater without formalin. The embryos were photographed daily during development and measured for endogenous nutrition depletion from 0 days post spawn (DPS) to 7 DPS. The results showed a significantly higher endogenous nutrition diminishment among treatments with formalin than the 5-ppt saltwater without formalin (p\u3c0.05). This implies that yellow perch incubated using formalin will have a lower endogenous nutrition reserve when they hatch as opposed to those that were not incubated using formalin. The second experiment also investigated the growth and survival of larval perch that were hatched after either being incubated in 5-ppt saltwater or freshwater and being reared in either a 5-ppt saltwater or freshwater environment. The feeding trial lasted for four weeks. The results of this study showed a significant increase (p\u3c0.05) in growth and survival of fish in the 5-ppt saltwater environment, based on the measurement of body length and size of fish. This result implies it may be a potential approach to use 5-ppt salinity to increase larval production of yellow perch. The third experiment determined if 5-ppt saltwater could enhance fingerlings previously grown solely in freshwater. Yellow perch fingerlings (192 DPH) were fed a high carbohydrate diet (25% wheat flour) containing 41% protein compared to a fishmeal-based diet containing 54% protein with no added carbohydrate. The feeding trial lasted for 8 weeks in a recirculating aquaculture system run with either freshwater or 5-ppt salinity water. The study showed no significant difference in growth between treatments reared at a 5-ppt low salinity and freshwater environment. The study did however find a significantly higher feed conversion ratio (FCR) in perch raised in saltwater as well as a higher hepatosomatic index (HSI). The protein efficiency ratio (PER) was higher in perch fed the wheat flour diet compared to those fed the fishmeal diet. These results conclude that more research into the optimal amount of carbohydrate inclusion in the yellow perch diet is needed, as well as the implementation of a low salinity environment