bluuebunny/crossref_metadata_2025 huggingface dataset:
Soapwort extract supplementation alters antioxidant status of serum, liver and heart tissues in growing Japanese quails reared under chronic intermittent cold stress
Authors: Dalkilic Bestami , Ozcelik Mehtap , Cambay Zafer , Alayunt Naci Omer , Simsek Ulku Gulcihan , Mutlu Seda Iflazoglu , Ciftci Mehmet
Published: July 2017

Antioxidant effect of dietary soapwort extract supplementation was studied in growing Japanese quails suffering from chronic intermittent cold stress. For this purpose, a total of ninety 15-d-old quails were divided into three groups with three replicates. Chronic intermittent cold stress was applied every night between 22.00 to 06.00 h; starting at 14 °C for the first week, and gradually weekly lowered to 8 °C. Three groups were fed with corn-soy based standard diets supplemented with 0, 50, and 100 ppm soapwort extract for four weeks. At the end of the study, three males and three females were slaughtered to determine total antioxidant and oxidant status of serum, malondialdehyde, glutathione, glutathione peroxidase activity, superoxide dismutase of liver and heart tissues. Although the dietary soapwort extract had no effect on serum total antioxidant capacity, it significantly lowered the total oxidant status of serum in cold stressed quails. Glutathione and superoxide dismutase enzyme activity of liver and heart tissues were similar among groups. While the dietary soapwort extract had no effect on glutathione peroxidase activity of the heart tissue, it significantly increased glutathione peroxidase activity in the liver tissue. In relation to the control group, malondialdehyde concentrations in the liver and heart tissues were significantly lower in soapwort extract groups. These data suggest that dietary soapwort extract could alleviate the detrimental effects of oxidative stress in growing Japanese quails exposed to cold stress.
Uterine B-cell lymphoma in two dogs – a case report
Authors: Novotný Ladislav , Taylor Frances , Claxton Katherine , Dudova Jana , Hanshaw Daren , Misik Jan
Published: July 2017

Uterine lymphoma is rare in the dog, in other animal species, and in humans. The lymphoma in the two female dogs presented as a primary tumour of uterine tissue and was classified as diffuse centroblastic B cell lymphoma. Terminally, the uterine lymphoma metastasized to various organs in one of the dogs, despite chemotherapy. This case study describes a very rare form of canine lymphoma and suggests to include lymphoma in the differential diagnoses in bitches with uterine masses.
β-Ocimene, a Key Floral and Foliar Volatile Involved in Multiple Interactions between Plants and Other Organisms
Authors: Farré-Armengol Gerard , Filella Iolanda , Llusià Joan , Peñuelas Josep
Published: July 2017

β-Ocimene is a very common plant volatile released in important amounts from the leaves and flowers of many plant species. This acyclic monoterpene can play several biological functions in plants, by potentially affecting floral visitors and also by mediating defensive responses to herbivory. The ubiquity and high relative abundance of β-ocimene in the floral scents of species from most plant families and from different pollination syndromes (ranging from generalism to specialism) strongly suggest that this terpenoid may play an important role in the attraction of pollinators to flowers. We compiled abundant evidence from published studies that supports β-ocimene as a generalist attractant of a wide spectrum of pollinators. We found no studies testing behavioural responses of pollinators to β-ocimene, that could directly demonstrate or deny the function of β-ocimene in pollinator attraction; but several case studies support that the emissions of β-ocimene in flowers of different species follow marked temporal and spatial patterns of emission, which are typical from floral volatile organic compound (VOC) emissions that are involved in pollinator attraction. Furthermore, important β-ocimene emissions are induced from vegetative plant tissues after herbivory in many species, which have relevant functions in the establishment of tritrophic interactions. We thus conclude that β-ocimene is a key plant volatile with multiple relevant functions in plants, depending on the organ and the time of emission. Experimental behavioural studies on pure β-ocimene conducted with pollinating insects will be necessary to prove the assumptions made here.
Facile Synthesis of Novel Coumarin Derivatives, Antimicrobial Analysis, Enzyme Assay, Docking Study, ADMET Prediction and Toxicity Study
Authors: Tiwari Shailee , Seijas Julio , Vazquez-Tato Maria , Sarkate Aniket , Karnik Kshipra , Nikalje Anna
Published: July 2017

The work reports the synthesis under solvent-free condition using the ionic liquid [Et3NH][HSO4] as a catalyst of fifteen novel 3-((dicyclohexylamino)(substituted phenyl/heteryl)-methyl)-4-hydroxy-2H-chromen-2-onederivatives 4a–o as potential antimicrobial agents. The structures of the synthesized compounds were confirmed by IR, 1H-NMR, 13C-NMR, mass spectral studies and elemental analyses. All the synthesized compounds were evaluated for their in vitro antifungal and antibacterial activity. The compound 4k bearing 4-hydroxy-3-ethoxy group on the phenyl ring was found to be the most active antifungal agent. The compound 4e bearing a 2,4-difluoro group on the phenyl ring was found to be the most active antibacterial agent. The mode of action of the most promising antifungal compound 4k was established by an ergosterol extraction and quantitation assay. From the assay it was found that 4k acts by inhibition of ergosterol biosynthesis in C. albicans. Molecular docking studies revealed a highly spontaneous binding ability of the tested compounds to the active site of lanosterol 14α-demethylase, which suggests that the tested compounds inhibit the synthesis of this enzyme. The synthesized compounds were analyzed for in silico ADMET properties to establish oral drug like behavior and showed satisfactory results. To establish the antimicrobial selectivity and safety, the most active compounds 4e and 4k were further tested for cytotoxicity against human cancer cell line HeLa and were found to be non-cytotoxic in nature. An in vivo acute oral toxicity study was also performed for the most active compounds 4e and 4k and results indicated that the compounds are non-toxic.
Identification of Candidate Genes Responsible for Stem Pith Production Using Expression Analysis in Solid‐Stemmed Wheat
Authors: Oiestad A. J. , Martin J. M. , Cook J. , Varella A. C. , Giroux M. J.
Published: July 2017

The wheat stem sawfly (WSS) is an economically important pest of wheat in the Northern Great Plains. The primary means of WSS control is resistance associated with the single quantitative trait locus (QTL) Qss.msub.3BL, which controls most stem solidness variation. The goal of this study was to identify stem solidness candidate genes via RNA‐seq. This study made use of 28 single nucleotide polymorphism (SNP) makers derived from expressed sequence tags (ESTs) linked to Qss.msub.3BL contained within a 5.13 cM region. Allele specific expression of EST markers was examined in stem tissue for solid and hollow‐stemmed pairs of two spring wheat near isogenic lines (NILs) differing for the Qss.msub‐3BL QTL. Of the 28 ESTs, 13 were located within annotated genes and 10 had detectable stem expression. Annotated genes corresponding to four of the ESTs were differentially expressed between solid and hollow‐stemmed NILs and represent possible stem solidness gene candidates. Further examination of the 5.13 cM region containing the 28 EST markers identified 260 annotated genes. Twenty of the 260 Qss.msub.3BL linked genes were up‐regulated in hollow NIL stems, while only seven genes were up‐regulated in solid NIL stems. An O‐methyltransferase within the region of interest was identified as a candidate based on differential expression between solid and hollow‐stemmed NILs and putative function. Further study of these candidate genes may lead to the identification of the gene(s) controlling stem solidness and an increased ability to select for wheat stem solidness and manage WSS.
Construction of Multimedia Teaching Platform for Community Nursing Based on Teaching Resource Library Technology
Authors: Li Pan , Li Chunyan
Published: July 2017

with the development of information technology, multimedia teaching appears in college education and brings great convenience for college teaching. The teaching resource library is the core part of multimedia teaching. This paper started from the establishment of 3D interactive model in teaching resource library, then discussed the construction of a new multimedia teaching platform and constructed the multimedia teaching platform from the aspects of picture library establishment, animation library and video library establishment, interactive 3D animation library establishment, overall structure of the platform and interface display. Then, the teaching platform was applied in teaching practice to test its effect. The contrastive analysis shows the application of teaching resource library in multimedia teaching of Community Nursing can effectively improve students’ learning interest and optimize the teaching effect.
Glocalization of Consumers in the Caribbean
Authors: Nicholas Fayola , Gundala Raghava Rao
Published: July 2017

Cultural value systems have a direct effect on consumer behavior and vary by the major cultural dimensions between countries. It is important for marketers to understand the factors that influence consumer behavior to develop their marketing strategy. It is also important to understand the possible differences within a culture (sub-culture). However, in the recent past, changes in the technology is playing a significant role in how marketers develop marketing strategies that address cultural and sub-cultural factors from both a domestic and global perspective; that means marketers must adhere to the Levi-Strauss maxim to think globally but act locally. This chapter is an example of how this is done in Trinidad and Tobago. The chapter gives a description of the culture of Trinidad and Tobago. A company case study that specifies how marketers develop strategies with the goal of providing precisely defined marketing messages that satisfy consumer's need products and services so that consumers should be adequately stimulated to purchase the products being offered.
Can We Trust the Health Information We Find Online?
Authors: Weitzel Leila , Quaresma Paulo , Moreira de Oliveira Jose Palazzo , Artigas Danilo
Published: July 2017

The Internet is becoming increasingly an important source of information for people who are seeking healthcare information. Users do so without professional guidance and may lack sufficient knowledge and training to evaluate the validity and quality of health web content. This is particularly problematic in the era of Web 2.0. Hence, the main goal of this research is to propose an approach to infer user reputation based on social interactions. Reputation is a social evaluation towards a person or a group of people. The results show that our rank methodology and the network topology succeeded in achieving user reputation. The results also show that centrality measures associated with the weighted ties approach suitably controls suitably the ranking of nodes.
Self-Efficacy and Persistence in a Digital Writing Classroom
Authors: Mitchell Jessica S.
Published: July 2017

Utilizing a New Literacies perspective, the purpose of this qualitative case study was to explore the digital writing experiences of one classroom of fifth-grade boys. Research questions for this study included the following: (1) What features of the digital writing environment impact student expressions of confidence in their abilities as writers? (2) How do expressions of confidence align with performance for students who are the least persistent in digital writing tasks? (3) How do expressions of confidence align with performance for students who are the most persistent in digital writing tasks? Through an embedded analysis, eight confidence features were identified. Compared against a holistic analysis of individual focal student experiences, this chapter provides two student vignettes to illustrate the differences between high-persisting and low-persisting students in a digital writing classroom.
Invariant Model Combining Geometry and Appearance for Facial Detection and Gender Classification From Arbitrary Viewpoints
Authors: Taffar Mokhtar , Miguet Serge
Published: July 2017

In this chapter, we tackle in the same process the problems of face detection and gender classification, where the faces present a wide range of the intra-class appearance are taken from arbitrary viewpoints. We try to develop complete probabilistic model to represent and learn appearance of facial objects in both shape and geometry with respect to a landmark in the image, and then to be able to predict presence and position of the appearance of the studied object class in new scene. After have predicted the facial appearance and the geometry of invariants, geometric hierarchical clustering combines different prediction of positions of face invariant. Then, the algorithm of cluster selection with a best appearance localizes faces in the image. Using a probabilistic classification, each facial feature retained in the detection step will be weighted by a probability to be male or female. This set of features contributes to determine the gender associated to a detected face. This model has a good performance in presence of viewpoint changes and a large appearance variability of faces.
Business Graduate Skills
Authors: Olivares Silvia Lizett Olivares
Published: July 2017

This chapter describes a model of competences composed of skills business professionals should possess once they graduate. The multilevel model considers competences from individual level to contextual (environmental) level requirements in order to start or lead a company in a complex and changing work environment. This chapter suggests that the academic institutions of higher education should learn about the emerging competences of different levels and types required from the current and future graduates when they reach the marketplace. Doing so will definitely help these academic institutions to design academic programs and services involving co-curricular and core-curricular activities on the campus in order to build and evaluate those different but interdependent competences.
Thoughtfully Preparing Business Students and Faculty for Study Abroad
Authors: Starr-Glass David
Published: July 2017

In the last twenty years study abroad program have grown in popularity. Study abroad experiences provide learning opportunities for participants, but these opportunities are only optimized if students are appropriately and thoughtfully prepared. Study abroad provides formal learning experiences, associated with coursework undertaken, and informal learning, related to new cultures and countries encountered. Students and the faculty who accompany them need to be sensitized to both of these opportunities. This chapter presents a context for study abroad experiences and suggests how they can provide students with a deeper appreciation of issues that are often overly abstracted in the college, particularly issues such as internationalization and globalization. It explores ways in which study abroad participants can be assisted to engage more fully with the experiences that they encounter abroad. In presenting learning and institutional strategies to help optimize study abroad, it is hoped that the chapter will be of value to business undergraduates, their faculty, and business educators.
How Business School Research Values Shape the Student Experience
Authors: Burgess Thomas F.
Published: July 2017

This chapter examines how the values of UK business school academics interact with the values of the students they teach. The chapter proposes that the dominance of research as the basis for academic progression, particularly in the top business schools, contributes to an environment where academics are challenged to conform to norms of ethical behaviour. These, and other environmental pressures such as the ratings and rankings merry-go-round, and major corporate failures such as Enron and Lehman Brothers, shape the academic value system and impact on the way that staff design and deliver their teaching. Conversely business school students also bring their values containing dysfunctional aspects, such as the increasing troubles associated with plagiarism. In particular the chapter draws on the case of the MBA, a business school's flagship programme to examine how the value systems of these two groups, academics and students, interact. The essence of this chapter is to investigate this interaction by integrating theory, secondary data and the author's reflections. The particular focus is on how staff research priorities shape and interact with the student experience in business schools.
Uberveillance, Standards, and Anticipation
Authors: Whyte Kyle Powys , List Monica , Stone John V. , Grooms Daniel , Gasteyer Stephen , Thompson Paul B. , Busch Lawrence , Buskirk Daniel , Giorda Erica , Bouri Hilda
Published: July 2017

Uberveillance of humans will emerge through embedding chips within nonhumans in order to monitor humans. The case explored in this chapter involves the development of nanotechnology and biosensors for the real-time tracking of the identity, location, and properties of livestock in the U.S. agrifood system. The primary method for research on this case was an expert forum. Developers of biosensors see the tracking capabilities as empowering users to control some aspects of a situation that they face. Such control promises to improve public health, animal welfare, and/or economic gains. However, the ways in which social and ethical frameworks are built into standards for the privacy/access, organization, adaptability, and transferability of data are crucial in determining whether the diverse actors in the supply chain will embrace nanobiosensors and advance the ideals of the developers. Further research should be done that explores the possibilities of tripartite standards regimes and sousveillance in relation to nanobiosensors in agrifood.
Flame photometric methods used in the Mineral Sciences Division, Mines Branch, Ottawa
Authors: Penner E M , Inman W R
Published: July 2017

Flame photometric methods are described for the determination of sodium, potassium, lithium and calcium in a variety of materials, including rocks, minerals, ores, metals, alloys, and ceramic materials. Most ôf these methods have been developed in the
Analytical Chemistry Subdivision of the Mineral. Sciences Division, Mines Branch. Some are modifications of existing methods. Procedures are given regarding decomposition of samples, elimination of interferences, and operation of the Perkin-Elmer flame photometer.
Conductimetric control of alkaline leach liquors
Authors: Eichholz G G , Flint T R
Published: July 2017

A conductimetric method has been developed which is proving valuable for the determination of reagent concentrations in acid and alkaline leach liquors and pulps. The design and construction of a prototype equipment for this purpose are described in detail, with
circuit diagrams and some discussion on practical operating problems. Results of some test work on the detection and control of caustic soda in carbonate leach liquors and of lime in cyanide solutions are summarized and show the possible use of conductimetric controls in such alkaline leach
solutions.
Lightweight concrete aggregates from clays and shales in Ontario
Authors: Wilson H S
Published: July 2017

The first half of the report includes a description of the various types of lightweight aggregates, the properties of lightweight concrete, the history of the expanded-clay and -shale industry and production processes. Various theories on the causes of bloating
are outlined and discussed. It is concluded that in most instances the chemical analysis of a material can be used to determine whether the liquid phase formed on heating will be of a viscosity to entrap bloating gases. The compounds that release bloating gas may be carbonates, organic matter,
sulphates, sulphides, hydrous minerals, or ferric oxide. The laboratory equipment and test procedures are described, and a brief account of the Palaeozoic and Pleistocene geology of Ontario and Quebec is given. The second half of the report consists of brief descriptions of the 111 locations from
which 211 samples there taken, and the results of the tests made. Fifty-five samples from 30 locations show promise of being suitable raw materials for production by the rotary kiln process. Some others might be used in the sintering process.
A radiotracer test at the Noranda smelter, July 15-18, 1963
Authors: Horwood J L , Dibbs H P
Published: July 2017

A radioactive tracer test was conducted at the smelter of Noranda Mines Ltd., Noranda, Quebec, July 15-18, 1963. Copper-64, a radioactive isotope, was introduced as cuprous oxide into a ladle of converter slag that was returned in the usual manner to a
reverberatory furnace. The rather rapid decay of copper-64 to half its activity every 12.8 hours required careful precautions to ensure delivery of the copper source to the test site at the scheduled time; samples from the test were counted at Noranda. Of principal interest were the relative
proportions of the tracer material removed from the furnace in the form of slag and matte, and the residence times in the successive layers in the furnace from which the slag and matte were tapped. Seven per cent of the copper-64 removed from the furnace was found in the slag in measurable amounts
during the first fourteen hours after injection--the most active sample in this group was taken at three hours. The remaining activity was found in the matte; this reached a peak in 12 to 13 hours and was still measurable after 48 hours. The almost complete recovery of the tracer material from the
furnace was verified by calculating and adding the amount removed in each ladle during these operations; this total activity corresponded with the activity of the source measured at the time of injection. Additional experiments were subsequently conducted in Ottawa with known activities of copper-64
to determine the efficiency of the sample geometry and the counting efficiency of the scintillation counters.
The determination of oxygen by fast neutron activation analysis
Authors: Dibbs H P
Published: July 2017

An account is given of the quantitative determination of oxygen by fast neutron activation. The method, which is both rapid and nondestructive, covers a very wide range of oxygen concentrations and is almost free from matrix effects. A description is presented
of the shielding requirements and of the automatic system for sample transfer. Interference effects that may arise from the presence of certain elements are also discussed.
A slime level indicator
Authors: Goodman R H
Published: July 2017

A simple method of detecting the slime level in a thickening tank is described. The detector uses optical transmission techniques and simple associated electronic circuitry. The unit has been tested and found to perform satisfactorily.
Scientific
A computer program for calculating principal stresses in photoelasticity
Authors: Gyenge M
Published: July 2017

Slope stability research is being conducted to increase our knowledge of the mechanics of rock slopes -- a subject of great importance in open pit mining. Stress analysis problems, where the major active force is gravity, give rise to several special requirements
when photoelastic models are being used. The use of a computer program for the separation and computation of the principal stresses means that the stress distribution within the entire model can be obtained quickly. It saves enormous amounts of time in comparison with manual computation and
therefore the efficiency of the model testing procedure is greatly increased.
The construction and operation of a micro-cone-softening apparatus
Authors: Jongejan A
Published: July 2017

The construction and operation of an apparatus with which cone-softening temperatures can be determined are described. The temperature of the furnace, which contains the cone, is controlled and can be recorded. The silhouette of the cone can be photographed with
a standard grid as background, so that its extent of deformation can be determined quantitatively. The apparatus is built from components that can also be used in other combinations for other purposes.
Reduction of ferric iron by SO2 with heat or SO2 with activated carbon
Authors: Lucas B H , Ritcey G M
Published: July 2017

In a liquid-liquid system for the separation and recovery of individual rare earths, co-extraction of ferric iron is a serious problem. This study was done to determine whether the problem could be solved by converting the iron to the ferrous state, as opposed to
precipitating the ferric iron to remove it from solution. In the precipitation of ferric iron, some co-precipitation of rare earths occurs. A synthetic iron solution, and a uranium barren solution containing 3.17 g Fe 4-2/1 and 0.34 g Fe +3/1, were used in the test work. The ferric iron in the
barren solution was reduced by 90% at 90 °C in 31 minutes by addition of twice the stoichiometric amount of S02. An alternate method used 1.5 times the stoichiometric amount of SO2 at room temperature and 15 g/1 activated carbon; retention time was 15 minutes. All of the test work was
carried out in an oxygen-free system. On the basis of this work the activated carbon-S02 method was the more economical. Measurement of the oxidation potential can be used as a method of control.
Development of an improved sample control and counting system for activation analysis with a neutron generator
Authors: Carson D W
Published: July 2017

An improved sample control and counting system has been developed for activation analysis with a neutron generator, replacing the original system developed earlier (1965). The new system, which uses low-level, low-noise, solid-state logic circuitry and includes
timing, counting and readout subsystems, provides improved frequency response and eliminates spurious counts created by the original relay-controlled circuits.
Quantitative x-ray determination of quartz and pyrite in dusts
Authors: MacHacek H
Published: July 2017

This investigation concerns the quantitative direct X-ray determination of quartz and pyrite in airborne mine dusts. A new technique developed by Leroux and Powers has been successfully applied and some new details have been found. The method provides
reproducible analyses of quartz and pyrite in dust samples. When the calibration curves of the pure components have been made and certain sources of error are kept within appropriate limits, quartz and pyrite can be determined down to 30 ?g/cm2 when deposited on appropriate
filters.
The effect of pH on the free-corrosion characteristics of 18% Ni (250) maraging steel in 3.5% NACl solutions
Authors: Syrett B C
Published: July 2017

The free-corrosion characteristics of 18% Ni (250) maraging steel in 3.5% NaC1 solutions have been studied, using tests in which the ratio of specimen area to solution volume was high (about 0.15 cm2 /m1). Initial pH values lay in the range of about 1 to
12, and both aerated and de-aerated solutions were employed. The observations were consistent with the established behaviour of many iron alloys in aqueous media.
Description of a computer method for the correction and prediction of electron microprobe data
Authors: Packwood R H
Published: July 2017

A computer method for correcting and predicting electron microprobe data is described. The programme is written in FORTRAN IV language. For convenience the programme is divided into two parts, a correction version and a prediction version, both of which use the
same procedures for calculating the effects of absorption (PHILIBERT-DUNCUMB and SHIELDS - HEINRICH), & - and P - line fluorescence (REED), atomic number (DUNCUMB and REED) , and bremsstrahlung (SPRINGER). The correction version also includes routines that allow for counter dead-time,
background, compound standards, and missing data. The prediction version is employed in general to compute calibration curves for systems under frequent investigation and in particular to calculate the compound standard factors that may be required by the correction version of the programme. Both
versions are demonstrated using experimental data and typical analytical situations. Notes on the practical use of the programmes are appended.
Off-line TECO - dataline editing with TECO commands on paper tape
Authors: Fraser D
Published: July 2017

The TECO EDITOR on the DATALINE TIU1E-SHARING SYSTEM can be used in a non-conversational mode cal led Off-Line Teco. Complete file-editing procedures, consisting of conversational Teco commands, can be prepared on punched paper tape for execution by Off-Line
Teco. This greatly reduces the cost of program development and modification on the Dataline System, and makes possible lengthy edits that would be too time-consuming with conversational Teco. This report is a "User's Manual" for Off-Line Teco, and describes how the editing tapes are made and
executed. Dataline Teco users will find the Off-Line Teco approach easy to follow and use.
Colorimetric analysis programs for the PDP-I0 time sharing system
Authors: Fraser D , Pilgrim R F
Published: July 2017

Three computer programs have been developed for a PDP-10 time sharing system to process the output data obtained at regular time intervals from a continuous colorimetric analyzer. The programs maintain a library of calibration curves, compute the concentrations
of reacting species and, by means of selected plots and regressions, yield chemical rate constants. A unique feature of the programs permits the use of unformatted data input. The report is produced in two parts: Part 1 - User's manual - This describes the purpose of the three programs and the entry
of data. Part 2 - Programmer's manual - This describes the structure of the programs and the related files. A tested method for loading, compiling and executing the programs is given.
Measurement of the reactivity of carbons for metallurgical processes part I - theoretical considerations
Authors: Reeve D A , Ramey N J , Hampel K H
Published: July 2017

In Part I of this report, the importance of the reactivity of carbons to such metallurgical processes as the blast furnace and the SL/RN Direct Reduction Process is examined and the chemistry of the Boudouard Reaction is discussed. In Part II, three test methods
for measuring the reactivity of cokes to carbon dioxide are compared, a loss-in-weight method, a gas-analysis method with constant CO9 flow rate, and a gas-analysis method with a variable CO2 flow rate but constant amount of conversion of CO to CO. Test results from the three methods on a series of
eight cokes made from 2 North American coking coals showed that any of the three methods would give acceptable relative reactivity values. A correlation between coke reactivity and blast furnace performance does not appear to have been established.
Zinc-tin-copper-lead ore, MP-1: its characterization and preparation for use as a standard reference material
Authors: Faye G H
Published: July 2017

The Mines Branch of the Department of Energy, Mines and Resources has undertaken a program to prepare a number of ores of metallic minerals for use as standard reference materials. This report describes the characterization and preparation of the second ore in
the program, a zinc-tin-copper-lead ore, MP-1, from New Brunswick. The mineralogical, geological and chemical characteristics of MP-1 are given as well as some details of methods used for its comminution, blending, and for assessing its homogeneity. Nineteen laboratories participated in the program
by providing analyses for selected elements. The recommended mean values for these are: Zn - 16.33%; Sn - 2.50%; Cu - 2.15%; Pb - 1.93%; Mo - 0.014%; In - 071%; Bi - 0.025%; As - 0.79%; Ag - 59.5 ppm. The analytical results and the evaluation of statistical parameters
for the above elements are reported.
The construction and operation of a meter for measuring the quality of zinc electrolytes
Authors: Kerby R C , Brannen J M , Ingraham T R
Published: July 2017

The construction and operation of a meter for automatically measuring the quality of zinc electrolytes, in relation to zinc electrodeposition, is described. The meter consists essentially of a small zinc electrolysis cell and a gas detection unit for measuring
the hydrogen evolved during electrolysis. The amount of hydrogen evolved provides a measure of current efficiency during zinc electrolysis. The meter can be used to provide a continuous record of the quality of the zinc electrolyte which is used in the cell room of a zinc electrolytic
plant.
Comparative corrosion resistance of zinc coatings prepared from mines branch and commercial cyanide plating baths
Authors: Lui A W , Hoey G R
Published: July 2017

The corrosion resistance of zinc coatings deposited on mild steel from one Mines Branch and three commercial cyanide plating baths were compared by the following three testing methods: (a) neutral salt spray, (b) humidified S02-air, and (c) combined humidified
S02-air and environmental chamber. No significant difference in corrosion rate was found when coatings of equal thickness prepared from the four different baths were tested under identical conditions. The corrosion resistance of the zinc coatings at various thickness levels indicated that the
service lives of the coatings depended on the thickness of zinc applied and not on the type of bath from which the zinc was deposited.
Copper-molybdenum ore, HV-I: its characterization and preparation for use as a standard reference material
Authors: Faye G H , Bowman W S , Sutarno R
Published: July 2017

A copper-molybdenum ore, HV-1, has been prepared and characterized for use as a standard reference material. HV-1 is the third ore of metallic minerals to be issued for sale as part of the Canadian Standard Reference Materials Project, of the Mines Branch,
Department of Energy, Mines and Resources. This report gives the mineralogical, geological and chemical characteristics of HV-1, as well as some details of methods used for its comminution and blending, and for assessing its homogeneity. Twenty-three laboratories provided analyses for copper and
molybdenum; the recommended mean values for these are: 0.52% and 0.058%, respectively. The analytical results and the evaluation of statistical parameters for copper and molybdenum are reported.
Influence of plating bath composition and steel surface treatment on corrosion resistance of cadmium coatings
Authors: Lui A W , Hoey G R
Published: July 2017

The corrosion resistance of cadmium coatings on mild steel prepared from the Mines Branch cyanide plating bath and a commercial bath was assessed by means of humidified S02-air and combined humidified S0a-air and environmental chamber tests. The mild-steel
surfaces had been prepared by three different techniques. There was no significant difference in corrosion resistance between coatings on surfaces prepared by the same cleaning method but plated from different cyanide baths. However, the corrosion resistance of cadmium coatings on surfaces prepared
by a nitric acid-acetic acid-phosphoric acid treatment was higher than those on surfaces prepared by other methods. The corrosion rates in the combined humidified S0a-air and environmental chamber test were higher than those in the humidified S02-air test. The experimental results indicate that the
service life of cadmium coatings of equal thickness is determined by the severity of the environment and the method of surface preparation but not by the type of cyanide plating bath used to plate mild steel.
The determination of bismuth in bismuth concentrates by chelatometric titration
Authors: Hitchen A , Zechanowitsch G
Published: July 2017

Two methods for the determination of bismuth in bismuth concentrates are described, both based on titration of the bismuth with sodium ethylenediamine-tetraacetate (EDTA). In one method, the end-point is detected visually by means of xylenol orange indicator,
whereas in the other, the end-point is detected amperometrically using a rotating platinum electrode maintained at + 1.2 volts vs the s.c.e. The advantages and disadvantages of each method are discussed. The effects of a number of elements peculiar to the particular sample material analyzed here and
of others commonly found in other bismuth concentrates were investigated. Procedures for the elimination of those that interfered were investigated and their effectiveness has been established. In particular, a rapid acid attack-volatilization procedure for the simultaneous dissolution of the sample
and volatilization of arsenic, antimony, and tin (without significant loss of bismuth) has been developed and is presented here. A hitherto undescribed interference due to aluminum, when xylenol orange is used, has been observed and causes and remedies for it are discussed. It is also shown that
aluminum, which interferes when xylenol orange is used, does not interfere when amperometric end-point indication is used, whereas iron and ascorbic acid, which interfere with the amperometric end-point method, do not interfere with the xylenol orange end-point.
Noble-metals-bearing sulphide concentrate PTC: its characterization and preparation for use as a standard reference material
Authors: McAdam R C , Sutarno R , Moloughney P E
Published: July 2017

A sulphide flotation concentrate from Sudbury, Ontario, has been prepared and characterized as a standard reference material for platinum, palladium, rhodium, gold, and silver. The recommended values for the contents of these elements in oz. /ton are as follows:
platinum 0.087, palladium 0.37, silver 0.17, rhodium 0.018, and gold 0.019. Several iridium, ruthenium, and osmium contents were reported by the laboratories that participated in the "round-robin" analytical program and these have been included in this report. The sample preparation and
characterization of the reference material are described and a statistical evaluation of the analytical values has been performed. This reference standard is now available from the Chairman of the Canadian Standard Reference Materials Project (CSRMP), Mineral Sciences Division, Mines Branch,
Department of Energy, Mines and Resources, 555 Booth Street, Ottawa, Ontario, KlA 0G1.
The floatability of ten non-metallic minerals (a supplement to TB 108)
Authors: Wyman R A , Colborne J H
Published: July 2017

The work reported is part of a long-range study intended to fill a continuing demand for information on industrial mineral flotation. Previous work, already reported, covered about 14,000 trials. The present work covers about 7,000 additional trials. The
experimental procedure involves a simple, bubble pick-up method applied in acid, neutral and basic conditions under the influence of thirty-one different collectors and six common modifiers. The trade names and general chemical names for collectors and modifiers are listed in the report. The method
of assessing results includes comparison on a weighted average basis and a graphical form of presentation which conforms with earlier presentations. The present work includes the data derived for amblygonite, aragonite, brucite, diopside, graphite, nepheline syenite, scheelite, tremolite, zeolite,
and zircon.
Environmental cracking behaviour of Pd-bearing Ti-7%A1-2%Nb-1%Ta alloy
Authors: Biefer G J , Williams A J
Published: July 2017

Alloys of Ti-7%A1-2%Nb-1%Ta (Ti-721) containing 0.26 to 1.56% Pd were tested in two different heat-treatment conditions. For one of these, termed "sensitized", the heat treatment was designed to favour the precipitation of OE2 (Ti 3A1), whereas
for the other, termed "desensitized", the heat treatment was designed to suppress Ti 3A1 precipitation. In tests on unstressed specimens of Ti-721, it was found that an alloying addition of 0.26% Pd was sufficient to bring about passivity in strongly acid 3.5% NaC1 solutions. However,
improvements in resistance to environmental cracking (EC) in 3.5% NaC1 solution were shown only by alloys containing 0.38 to 1.56% Pd. Ti-721 alloy containing a2 (Ti 3A1) is known to be highly sensitive to EC. Despite moderate improvements imparted by palladium, the sensitized Ti-721 Pd
alloys remained unacceptable in so far as resistance to EC was concerned. Desensitized Ti-721 Pd also showed improved resistance to EC at 0.38 to 1.56% Pd, these alloys showing a more acceptable level of resistance. Probably because of a solid solution strengthening mechanism, 0.75 to 1.56%
Pd brought about minor increases in yield and ultimate tensile strength and also in fracture toughness. An additional slight increase in yield strength was caused by the sensitizing heat treatment at all palladium levels.
An evaluation of the titrimetric and atomic absorption determination of tin in the certified reference materials, MP-I and KC-I
Authors: Steger H F
Published: July 2017

An investigation has been undertaken into the determination of tin in the certified reference materials, MP-1 and KC-1, by the titrimetric and atomic absorption methods. The effect of the nature of the metal used to reduce Sn(IV) to Sn(II) in the titrimetric
method has been evaluated. It has been shown that there is no significant difference between the results obtained by the titrimetric method when properly applied and those obtained by the atomic absorption method using the standard additions technique. The mean value for tin in MP-1 and KC-1 by both
methods are 2.43% and 0.683% respectively. The value for MP-1 is lower than the recommended value.
Northern mining problems with particular reference to unit operations in permafrost
Authors: Dubnie A
Published: July 2017

As transportation facilities improve, the economics of northern mining will be favourably affected and substantially more mines will be operated. Many of the mines may be located in permafrost, but, so far, few Canadian studies of mining within such an
environment have been made. Surface miners have already learned how to operate in the North, and, through trial and error, modifications to equipment and to the conditions for personnel have enabled year-round operation. However, efficient fragmenting of frozen rock may be one area where methodical
research may reduce the costs to northern operations. Underground miners have applied southern methods to northern mining with only minor modifications. This may have led to higher mining costs than necessary, but owing to other major problems (i.e. transportation) they may have been obscured. The
possibility of developing new concepts for northern mining, whereby the environment would be preserved to utilize whatever advantages it may present, has not received attention. This report discusses research in many areas of northern mining such as: the evaluation of supports in access openings and
stopes in permafrost; the use of frozen fills as support; the environmental effects of dry mining; the techniques of ice control in access openings.
Problemes miniers dans le nord avec reference particuliere aux chantiers d'exploitation dans le pergelisol
Authors: Dubnie A
Published: July 2017

As transportation facilities improve, the economics of northern mining will be favourably affected and substantially more mines will be operated. Many of the mines may be located in permafrost, but, so far, few Canadian studies of mining within such an
environment have been made. Surface miners have already learned how to operate in the North, and, through trial and error, modifications to equipment and to the conditions for personnel have enabled year-round operation. However, efficient fragmenting of frozen rock may be one area where methodical
research may reduce the costs to northern operations. Underground miners have applied southern methods to northern mining with only minor modifications. This may have led to higher mining costs than necessary, but owing to other major problems (i.e. transportation) they may have been obscured. The
possibility of developing new concepts for northern mining, whereby the environment would be preserved to utilize whatever advantages it may present, has not received attention. This report discusses research in many areas of northern mining such as: the evaluation of supports in access openings and
stopes in permafrost; the use of frozen fills as support; the environmental effects of dry mining; the techniques of ice control in access openings.
Theory and experiment in methods for the precision measurement of viscosity
Authors: Thresh H R
Published: July 2017

Methods of measuring viscosity are appraised for their suitability to liquid metals at elevated temperatures. Selected methods are examined for their potential sources of error, and means are discussed for eliminating, minimizing or correcting for
error.
Ejection of atoms from metallic single crystals
Authors: Cunningham R L , Ng-Yelim J
Published: July 2017

The unique characteristics of experimental data obtained from the directional ejection of atoms from metallic single crystals subjected to ion bombardment are discussed. The advantages, for instructional purposes, are outlined. Simple experiments are described
that are designed to give the beginner in crystallography a working familiarity with (1) crystal directions, (2) techniques for orientation determinations, and (3) anisotropic characteristics of crystals. All experiments described may be performed with simple and inexpensive
equipment
Additives prevent low carbon steel corrosion in sulfurous acid
Authors: McLeod W , Rogers R R
Published: July 2017

Mild steel in contact with an aqueous solution of sulfurous acid can be protected from corrosion by the use of an inhibitor consisting of ammonium oxalate and hexamine. The experimental results leading to this discovery are described In this
article
Experimental alloy analysis by x-ray spectroscopy
Authors: Reed D J
Published: July 2017

The lack of standards for non-routine X-ray spectrography has resulted in the use of synthetic standards for the determination of minor constituents in experimental alloys at the Mineral Sciences Division of the Mines Branch. For mild steels secondary Mines
Branch standards have been developed with the aid of these synthetic standards. For major constituents the use of solutions dried on filter papers has produced some unexpected results. Major elements in an alloy have been determined from ratios obtained under conditions of equivalent excitation when
only a single standard was at hand. Computer techniques have been examined for the determination of both major and minor constituents when a suitable number of standards were available.
Evaluation of iron oxides for ferrite manufacture
Authors: Ratnam D V
Published: July 2017

Iron oxides intended for use in ferrite manufacture are described in terms of physical properties such as surface area, particle size and shape, and tap density. Results are presented of a study of the barium hexaferrite formation reaction, using X-ray
Diffraction, Differential Thermal and Thermogravimetric Analyses and, based thereon, the possibility of including a reactivity parameter in the description of an iron oxide is suggested.
Stress measurements at Elliot Lake AND A comparison of two methods for measurig stress in rock
Authors: Coates D F , Grant F , Van Heerden W L
Published: July 2017

As part of an extensive program of measuring rock stresses, a series of comparative measurements were made in a Canadian uranium mine by means of a strain cell developed at the South African Council for Scientific and Industrial Research and of a borehole
deformation meter developed at the U.S. Bureau of Mines. An analysis of the results, taking account of certain sources of error, shows that there is satisfactory agreement between the results obtained with the two methods
Atmospheric and surface effects on the fatigue properties of aluminum alloys
Authors: Eeles E G , Thurston R C A
Published: July 2017

Two commercial aluminum alloys were cyclically stressed in moist and dry air. The data obtained give substantial support to the hypothesis that variable cracking of the surface oxide is responsible for environmental fatigue effects. Processing in kerosene was
found to have differing effects on the two alloys. A polar organic compound added to kerosene produced a significant reduction in the scatter of data from one alloy