bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Shuffled Frog Leaping Algorithm in Software Project Scheduling
Authors: Sharma Tarun Kumar
Published: March 2016

Nature inspired intelligent algorithms is moderately a new research paradigm that offers novel stochastic search techniques for solving many complex optimization problems. These techniques mimic the social and natural behavior of vertebrates. The basic idea behind modeling of such techniques is to achieve near optimum solutions to the large scale and complex optimization problems which can't be solved using traditional or gradient based mathematical techniques. Here our focus is on the problems of optimization in software engineering design process. Quality Software is a sturdy foundation of Information Technology (IT) and developing the tactical competence among nationalities. It has been experienced that the working and life style is changed drastically with the emergence of Software. This chapter concentrates on Shuffled Frog Leaping Algorithm (SFLA) and employed to solve Software Project Scheduling (SPS) Problem. SPS is classified as a NP-hard problem with largely complex combinatorial optimization constraints.
Effective Learning Strategies for the 21st Century
Authors: Chen Catherine
Published: March 2016

Due to the ubiquity of technology use in today's society, 21st century workers are likely to be knowledge workers who can use computer technologies to perform non-routine tasks. Students in this century are also likely to learn computer skills online. A robust instrument to investigate effective strategies while learning computer skills is needed. Although the Motivated Strategy for Learning Questionnaire (MSLQ) have been used widely in a conceptual learning environment, it has limitation in assessing students' use of learning strategies in computer software courses. In addition, there have been concerns about the latent factor structure of the MSLQ. This chapter presents a revised learning strategies section of the MSLQ for assessing learning strategies used in a hands-on, computer-skill learning environment. The new instrument contains five learning strategy subscales and exhibits validity and reliability. This revised instrument can be used to assess learning computer skills online.
Outstanding Student Achievement
Authors: Self Richard J.
Published: March 2016

This chapter will describe, evidence and critically evaluate a pedagogical journey which takes the reader from a traditional position of the “academic as a domain expert” to what turns out to be a far more effective position as the “academic as a Learning to Learn expert”. The evidence used to confirm the value and effectiveness of this changed approach by the author over a period of 5 years or so is based on Learning Analytics which demonstrate significantly improved academic results and achievements. It also demonstrates that the author's teaching styles have a dramatic impact on the so-called BME Achievement Deficit, compared to many modules at the institution. It has also had a significant impact in terms of improving student satisfaction. The confirmatory evidence derived from the Learning Analytics is now being used to make informed choices by other colleagues to change their own pedagogical choices to also develop excellent achievement in their own modules and programmes
Role of Learning Analytics in Enhancing Teaching and Learning
Authors: Manzoor Amir
Published: March 2016

Data analytics, tools and techniques are no more confined to research organizations. These tools are being adopted by many organizations to generate business intelligence for improving decision making. Higher education institutions (HEIs) are beginning to use data analytics for improving their services and for increasing student grades and retention. Educational learning analytics are used to research and build models in several areas that can influence online learning systems. While use of analytics and data mining in education is increasing, sorting out fact from fiction and identifying research possibilities and practical applications are not easy. This chapter intends to help policymakers and administrators of HEIs understand how learning analytics have been used and can be applied for educational improvements.
The Role of Learning Analytics in Global Higher Education
Authors: Kasemsap Kijpokin
Published: March 2016

This chapter presents the role of learning analytics in global higher education, thus illustrating the theoretical and practical overview of learning analytics; learning analytics and educational data mining (EDM); learning analytics and learning management system (LMS); learning analytics and Course Signals; learning analytics and knowledge perspectives; learning analytics and social networking sites; and the significance of learning analytics in global higher education. The application of learning analytics is critical in global higher education that seeks to serve the school administrators and students, increase educational performance, sustain competitiveness, and fulfill expected accomplishment in global higher education. The chapter argues that applying learning analytics has the potential to improve educational performance and reach strategic goals in the information age.
A Thermal Stress Analysis of Three-Dimensional Beams by Refined One-Dimensional Models and Strong Form Solutions
Authors: Giunta Gaetano , Belouettar Salim , Carrera Erasmo
Published: March 2016

This paper investigates the mechanical behaviour of three-dimensional beams subjected to thermal stresses.The temperature field is obtained by exactly solving Fourier's heat conduction equation and, as classically done by a staggered solution approach, it is considered as an external load within the mechanical analysis.Several higher-order beam models are derived thanks to a compact notation for the a-priori approximation of the displacement field upon the cross-section.The governing differential equations and boundary conditions are obtained in a compact nuclearform using the Principle of Virtual Displacement.The final form does not depend upon the order of approximation of the displacement fieldover the cross-section (this latter being a free parameter of the proposed modelling approach).The obtained problem is solved by means of two strong form solutions: an analytical Navier-type solution andpoint collocation (using Wendland's radial basis functions).Isotropic, functionally graded and laminated beams are considered.Results are validated towards three-dimensional FEM solution obtained by ANSYS.The proposed models yield accurate results characterised by smooth stresses thanks to the used solution methods.Furthermore, computational costs are very attractive when compared to the reference three-dimensional solutions.
High-Fidelity and Computationally Efficient Component-Wise Structural Models: An Overview of Applications and Perspectives
Authors: Petrolo Marco , Carrera Erasmo
Published: March 2016

The Component-Wise approach (CW) is a novel structural modeling strategy that stemmed from the Carrera Unified Formulation (CUF). This work presents an overview of the enhanced capabilities of the CW for the static and dynamic analysis of structures, such as aircraft wings, civil buildings, and composite plates. The CW makes use of the advanced 1D CUF models. Such models exploit Lagrange polynomial expansions (LE) to model the displacement field above the cross-section of the structure. The use of LE allows the improvement of the 1D model capabilities. LE models provide 3D-like accuracies with far fewer computational costs. The use of LE leads to the CW. Although LE are 1D elements, every component of an engineering structure can be modeled via LE elements independently of their geometry, e.g. 2D transverse stiffeners and panels, and of their scale, e.g. fiber/matrix cells. The use of the same type of finite elements facilitates the finite element modeling to a great extent. For instance, no interface techniques are necessary. Moreover, in a CW model, the displacement unknowns are placed along the physical surfaces of the structure with no need for artificial lines and surfaces. Such a feature is promising in a CAD/FEM coupling scenario. The CW approach can be considered as an accurate and computationally cheap analysis tool for many structural problems. Such as progressive failure analyses, multiscale, impact problems and health-monitoring.
Shell Finite Elements for the Analysis of Multifield Problems in Multilayered Composite Structures
Authors: Cinefra Maria , Carrera Erasmo
Published: March 2016

This paper deals with the analysis of layered structures under thermal and electro-mechanical loads. Constitutive equations for multifield are considered and the Principle of Virtual Displacements (PVD) is employed to derive the governing equations. The MITC9 shell finite element based on the Carrera's Unified Formulation (CUF) has been applied for the analysis. The models grouped in the CUF have variable through-the-thickness kinematic and they provide an accurate distribution of displacements and stresses along the thickness of the laminate. The shell element has nine nodes and the Mixed Interpolation of Tensorial Components (MITC) method is used to contrast the membrane and shear locking phenomenon. The finite element analysis of multilayered plates and shells has been addressed. Variable kinematics, as well as layer-wise and equivalent single layer descriptions, have been considered for the presented FEs, according to CUF. A few problems are analyzed to show the effectiveness of the proposed approach. Various laminations, thickness ratios and curvature ratios are considered. The results, obtained with different theories contained in the CUF, are compared with both the elasticity solutions given in literature and the analytical solutions obtained using the CUF and the Navier's method.
Selected Aspects of Current Challenges in Composite Product Development for Automotive and Aerospace Industry
Authors: Czichon Steffen , Köhnke Jessica , Preisler Andreas , Herranen Henrik
Published: March 2016

This article provides an overview over some current challenges in industrial composite product development with a main focus on numerical analysis. Three main subjects are covered. Firstly, sizing of composite joining techniques is discussed with an emphasis on the joining of thin ply laminates. Secondly, multi scale analysis, determination of nesting factors and optimization of braided composite structures is discussed. Finally, a shape optimization approach for embedded SHM sensors, aiming at improving the mechanical properties of monitored laminates, is presented.
Post-Buckling Analysis of Damaged Multilayered Composite Stiffened Plates by Rayleigh-Ritz Method
Authors: Oliveri Vincenzo , Alaimo Andrea , Milazzo Alberto
Published: March 2016

A Rayleigh-Ritz approach for the analysis of buckling and post-buckling behavior of cracked composite stiffened plates is presented. The structure is modeled as the assembly of plate elements modeled by the first order shear deformation theory and taking geometric nonlinearities into account through the von Karman’s theory assumptions. Continuity along the plate elements connected edges and the enforcement of rigid and elastic restraints of the plate boundaries are obtained by using penalty techniques, which also allow to straightforwardly implement efficient crack modeling strategies. General symmetric and unsymmetric stacking sequences are considered and numerical procedures have been developed and used to validate the present solution by comparison with FEA results. Original results are presented for post-buckling solution of multilayered stiffened plates with through-the-thickness cracks, showing the effects of large displacements on the cracked plate post-buckling behavior.
Analysis and Comparison of Calculation Methods for Release of Corrosive Gases
Authors: Skřínská Mária , Skřínský Jan , Sluka Vilem , Pražáková Martina , Malý Stanislav , Frišhansová Lenka , Senčík Josef
Published: March 2016

The rapid growth in the use of corrosive gases transported by pressure vessels and pipelines has brought significant increase of risk to a number of people, both workers and public, whose life could be endangered at any one time by accident involving these chemicals. Due to the complexity of the involved physical phenomena and to the lack of an adequate amount of reliable experimental data, a number of different models and calculation procedures for estimating the consequences following the release of a corrosive gas are presently reported in the literature. The contribution deals with real scenarios of accidents associated with stationary risk facilities with corrosive flammable toxic chemicals. The study presents the results of hazardous zone calculation for the event of various corrosive liquids (Cl2, NH3, CCl2O, C3H4O) toxic releases. The goal of this article is to present the results of the approach of modeling using the standard methods and to demonstrate the importance of the next development stage in the area of corrosive materials accident modeling of releases and dispersions in cases of accident.
Grey Anodizing of a Grade 5 Titanium Alloy: Study of Process Parameters
Authors: Pezzato Luca , Brunelli Katya , Dabalà Manuele
Published: March 2016

Anodizing is one of the most promising surface treatments for lightweight metals as titanium because it can increase wear and corrosion-resistance, as well as provide aesthetic appearance and electrical insulation.Three different types of anodizing can be performed on titanium alloys: type I for elevated temperature forming, type II as anti-galling application and type III for coloured surfaces. The type II anodization, called also grey anodizing, is often requested in aerospace or biomedical applications. It is characterized by the use of alkaline electrolyte and it is standardized according to the SAE AMS 2488D norm. However, in literature it is difficult to find information about the process parameters of grey anodizing.In this work, different parameters of the grey anodizing process on a grade 5 titanium alloy were investigated and optimized, in order to obtain an anodized layer with the desired properties, in terms of corrosion resistance, thickness of the coating and wear properties. In particular, the effect of current and voltage applied, treatment time, temperature and electrolyte composition on the characteristics of the anodized layer was studied.The thickness, the composition, the morphology and the adhesion of the protective layers were characterized by SEM/EDS analysis. The chemical and phase composition were analyzed by XRF and XRD techniques. The corrosion resistance of the samples was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy tests. The best results were obtained using as electrolyte a solution containing sodium hydroxide, titanium dioxide, sodium silicate and activated charcoal, with the formation of an anodized layer mainly constituted by titanium oxides and silicates. Intermediate treatment times and ambient temperature were the best conditions to produce the anodized layer. The sample with the best performances showed a homogeneous protective layer about 5 μm thick and was characterized by a lower corrosion current density, higher corrosion potential and polarization resistance, compared with the other anodized samples.
Effect of Regimes of Anode Plasma Electrolytic Carburizing on Tribological Properties of Titanium Alloy VT 20
Authors: Komissarova Mariya R. , Dyakov Ilia G. , Gladii Yurii P.
Published: March 2016

Microhardness, friction coefficient, and wear rate of carburized titanium alloy VT 20 are considered. An X-ray diffractometer, a scanning electron microscopy (SEM) used to characterize the phase composition of the modified layer and its surface morphology. A pin-on-disc tribometer was occupied to evaluate wear behavior of the treated titanium alloys. It is established that the friction coefficient decreases from 0.46 (untreated sample) to 0.15 for the sample carburized at 750 °C during 5 min. Therefore, the anode carburizing of titanium alloys results in the reducing of the wear rate by 2 orders.
Plasma Electrolytic Hardening and Nitrohardening of Medium Carbon Steels
Authors: Belkin Pavel N. , Kusmanov Sergei A. , Smirnov Aleksei A.
Published: March 2016

Results of plasma electrolytic hardening and nitrohardening of medium carbon steels are discussed. The hardness of medium carbon steels after its plasma electrolytic quenching is HRC 56–62. The electrolytic heat-treatment in aqueous solution under pulse conditions can achieve different heating rates by varying the pulse periods and the ON:OFF ratios. The nitrogen diffusion decreases the austenitization temperature and results in formation of martensite after the sample cooling in the electrolyte. The aqueous solution that contained 15 wt.% NH4Cl allows one to obtain the layer microhardness up to 1060 HV during 5 min at 750 °C. In this work, we investigate the corrosion resistance of the medium carbon steel which is obtained as a result of plasma electrolytic nitriding with following hardening in the same electrolyte. The cross-sectional microstructure, composition and phase constituents of modified layer under different processing conditions were characterized. It is shown that external oxide layer and nitrided layer promote the increase in the corrosion resistance. The maximal corrosion potential and minimal corrosion current density are observed after the nitriding of steels in the aqueous solution (11 wt.% of ammonium chloride and 11 wt.% of ammonium nitrate) at 750 °C during 5 min followed by the steel cooling in air.
The Microstructure of Hafnium Modified Aluminide Coatings Deposited by CVD Method
Authors: Góral Marek , Pytel Maciej , Filip Ryszard , Nowotnik Andrzej
Published: March 2016

The paper presents results of microstructural analysis of Hf-modified aluminide coatings. The coating was obtained using chemical vapour deposition (CVD) method at 1040°C using BPX-Pro 325 S equipment (Iond Bond). The deposition process time was 960 mintutes. The IN-718, IN-100 as well as CMSX-4 single-crystal nickel superalloys were the substrate material. The observation of coating was carried out using scanning electron microscopy. Chemical composition was analyzed using EDS method. The results showed that hafnium accumulates mainly on diffusion/additive layer interface and forms a „chain” of small precipitations. Hafnium was found in the additive NiAl layer of aluminide coating deposited on IN-100 superalloy. Its amount did not exceed 0.3 at %.
The Influence of Ar/N2 Plasma Gases on Microstructure of Ceramic Coatings Produced by PS-PVD Method
Authors: Pędrak Paweł , Góral Marek , Dychtoń Kamil , Kubaszek Tadeusz , Nowotnik Andrzej , Kubiak Krzysztof
Published: March 2016

The PS-PVD method is a promising technique for production of ceramic coatings from the vapor phase on gas turbine components. The resulting layers combine benefits of coatings made by the plasma spray method and other methods of Physical Vapor Deposition. The plasma spray process is carried out under reduced pressure (~ 200 Pa) and with the use of a gun applied in the method (the LPPS torch 0C3P). The PS-PVD enjoys many of the benefits of plasma spray methods combined with relatively low production costs and overall better properties. One of the significant costs of coating manufacturing by this method is the use of helium as process gas to generate plasma. The authors attempted to form a ceramic coating from ZrO2, where a mixture of argon and nitrogen in various proportions was used. The resulting layers were analyzed by XRD, LFA, SEM-EDS.
High-Temperature Corrosion of NiCrAlY/YSZ Coatings in Ar-1%SO2 Gas
Authors: Yadav Poonam , Abro Muhammad Ali , Lee Dong Bok
Published: March 2016

The thermal barrier coating that consisted of ZrO2-8Y2O3 top-coat and Ni-22Cr-10Al-1Y bond-coat corroded in Ar-1%SO2 gas at 1000-1200°C for up to 300 h. The top-coat and bond-coat consisted primarily of β-ZrO2 and (γ-Ni, α-Al2O3), respectively. During corrosion, Al oxidized preferentially to α-Al2O3 to protect TBC, and sulfidation occurred to a small extent.
Detection of pH Increase at the Surface of Cathodically Polarized Metal by Means of Amphoteric Metals Activation
Authors: Kouril Milan , Palffy Alexander , Hruska Jan , Novak Pavel , Msallamová Šárka
Published: March 2016

Nowadays, the cathodic protection is a common way of additional corrosion protection of buried structures. This protection is usually accompanied by cathodic polarisation on the protective potential of-850 mV(CSE). Its function is to prevent undesirable corrosion rates, in case the coating protection fails. Objective was to predict a state in terms of passivity or activity in which a carbon steel is in. And to do so, there is a monitoring of pH values by amphoteric metals, which would track pH changes of cathodically protected material in a soil. For pH detection, Al and Zn, were used. Main aim was to track corrosion rate of these amphoteric metals as a most reliable way to predict pH changes. Cathodic protection led to higher pH values of model soil located closely to surface of protected material. In case of carbon steel, alkalisation led to passive state and in the same time amphoteric metals could exist in active state. The aim of this work was to clarify usage of monitoring the corrosion rate of amphoteric metals for detection of pH values influenced by cathodic polarisation.Graphical abstract: Fig. 1 Kinetic and thermodynamic demonstration of passivation of cathodically protected steel
Case Studies from Industrial Failures
Authors: Bernasovský Peter , Brziak Peter , Orszaghová Jana , Košinová Alena , Paľo Miroslav , Petráňová Annamária
Published: March 2016

The contribution summarizes some corrosion case studies of the welded steel structures, which happened in Slovakia last years. Features of cracking are illustrated on real cases of breakdowns in the petrochemical industry (SSCC and PTA-SCC of stainless steel), at a cement works (LME of AISI 310 steel due to Ni3S2 attack ), at a gas pipeline (LME caused by remelted Cu) and in the water meters & tubes made of stainless steel (MIC).
Corrosion-Mechanical Properties of Multifunctional Composition "Steel-Material with a Shape Memory Effect"
Authors: Blednova Zhesfina Michailovna , Rusinov Peter Olegovich , Stepanenko M.A. , Tarbin Andrew Nikolayevich
Published: March 2016

The article studies results of corrosion-mechanical behavior of multifunctional composition "steel-material with a shape memory effect" formed in high-energy impacts in different environments. Analysis of experimental results shows an increased resistance to corrosion of the composition "steel-material with SME based on TiNi, NiAl» and confirms their protective properties in water, natural atmosphere, marine environments, saturated NaCl solution and medium aggressive environments. It has been shown that for highly corrosive acids with concentration of > 20% based on hydrofluoric HF, hydrochloric HCl, sulfuric H2SO4 there are several limitations and stages associated with dissolution of the layer and loss of corrosion resistance. Given the significant effect of surface treatment method on the whole range of functional and mechanical properties of materials with shape memory effect, we proposed recommendations on the selection of compromise solutions.
Needs of Patients’ Family Members in an Intensive Care Unit With Continuous Visitation
Authors: Jacob Mini , Horton Cynthia , Rance-Ashley Sharon , Field Tera , Patterson Robbie , Johnson Claudette , Saunders Holly , Shelton Tracy , Miller Jessica , Frobos Carmen
Published: March 2016

Background

Although many critical care experts and national organizations support open visitation in intensive care units (ICUs), most ICU visiting policies do not allow unrestricted presence of patients’ family members.

Objective

To describe how well the needs of family members were met in an adult neuroscience ICU with a continuous visitation policy and an adjoining private suite for patients’ family members.

Methods

An exploratory, descriptive study design was used to identify the effects of continuous family visitation in the neuroscience ICU on patients’ family members and their needs and experiences during their time in the unit. A convenience sample of consenting family members completed a survey of family need items 72 hours after the patient was admitted to the unit.

Results

The most important needs identified by the 45 family members surveyed were items relating to information about the patient, visiting the patient, being given hope, talking with a doctor each day, and being assured that the best care is being given to the patient. Least important items were related to physical comforts for the family members. The vast majority of family members rated their needs as being met for all of the items in the survey and reported a high level of satisfaction with care.

Conclusion

In a neuroscience ICU with an open visitation policy and a private suite for patients’ family members, family members rated their needs as being met at a high level, unlike in prior studies in units with limitations on family visitation. The rank order of the importance of each need in the survey was similar to rankings in prior studies in a variety of critical care units.
Preliminary notes on the Proterozoic Hurwitz Group, Tavani, 55k, and Kaminak Lake, 55l, areas District of Keewatin
Authors: Bell R T
Published: March 2016

The initial results of a continuing stratigraphic and sedimentological study of the Hurwitz Group and related rocks are summarized. The Hurwitz Group and related rocks are largely confined to two down-folded and faulted belts - the Kaminak belt in Kaminak Lake
map-area (55L) and the Whiterock belt in Tavani map-area (55K). The Hurwitz Group in these areas is divisible into seven distinct mappable units. Exposure is poor to mediocre except for the orthoquartzite units which form the 'backbone' of the Hurwitz Group and have been considered to be the most
typical lithology. The studies have established sedimentological trends suggesting that the southwest end of the Kaminak belt and the area southwest of Kaminak Lake map-area may be favourable for exploration for uraniferous (and auriferous) placer deposits but in Tavani area conditions are not
auspicious .
Mesozoic and Cenozoic Geology of the Northeast part of Mount Waddington map-area, 92n, Coast District, British Columbia
Authors: Tipper H W
Published: March 2016

The northeastern part of Mount Waddington map - area is underlain mainly by Upper Triassic to Tertiary volcanic and sedimentary rocks. The Upper Jurassic and Lower Cretaceous rocks were deposited in the northwest trending Tyaughton Trough . Small stocks of
granitic rocks were emplaced in post - Cenomanian time within the mapped part of the area and to the southwest. In Late Cretaceous or early Tertiary time the area was disrupted first by north easterly directed thrust faults, later by repeated movement on northwest-trending, right-lateral trans
current faults, and finally by northeast trending normal faults.
Foraminiferal zonation and stratigraphy, the type section of Nizi Formation, carboniferous system, chesteran stage, British Columbia
Authors: Mamet B L , Gabrielse H
Published: March 2016

The type section of the Nizi Formation in northernmost central British Columbia comprises more than 1, 643 feet of well bedded carbonates with a conglomeratic elastic unit near the base. An abundant micro fauna defines four assemblage- zones ranging in age from
Late Visean to Early Namurian (zones 16 to 18 in Eurasia), an interval considered time-equivalent to the Chester Group (Upper Mississippian) of the midcontinent.
Nature, distribution and content of zirconium and niobium in a silico-carbonatite sill at St-Michel, Montreal Island, Quebec
Authors: Steacy H R , Jambor J L
Published: March 2016

A silico-carbonatite sill exposed in the Francon (1966) Ltee quarry at St-Michel, Montreal Island, Quebec, contains approximately 0.09 per cent Zr02 and 0.11 per cent Nb205. The sill consists predominantly of feldspar and dawsonite. Zirconium is present as zircon
and weloganite, the latter occurring megascopically in vesicles and cavities which are a prominent feature of the sill. Niobium is present as pyrochlore which is finely disseminated in the rock matrix.
Permo-carboniferous stratigraphy and structure of central Prince Edward Island
Authors: Frankel L , Crowl G H
Published: March 2016

The Fermo-Carboniferous and perhaps younger rocks consist mainly of sandstone, with lesser amounts of conglomerate, mudstone breccia and mudstone and are assignable to subunits AZ and A3, and unit C of the stratigraphic sequence established in southeastern Prince
Edward Island. Subunit Al and unit B have not been seen in the map-area, Unit C and subunit A3 are unconformable. The major structure is a northeastward plunging syncline whose axis seemingly parallels those of Gallows Point anticline and Kilmuir syncline lying 16 and 24 miles respectively to the
southeast. Faults bound a complex graben or tilt-block structure trending northwest-southeast across the central part of the island. This faulting occurred after the deposition of unit C.
Precambrian geology of the Norway House and Grand Rapids map area
Authors: Ermanovics I F
Published: March 2016

Six thousand square miles of the Superior Province in southeastern Manitoba have been interpreted in terms of orogenic zones and depth. It is suggested that volcanic belt rocks, layered gneisses and n1afic diorite, representing 24 per cent of the exposed rocks in
the area, are the relicts of the meso- and supracrustal zones developed during the Kenoran orogeny; such rocks are confined to areas north of latitude 53°301 Pre-Kenoran, remobilized leucocratic, foliated granodiorite and quartz dioritic rocks constitute 62 per cent of the map-area and occupy
85 per cent of the terrain south of latitude 53° 301 This latitude, marked by mylonite is the northern boundary ot the Berens batholithic block. The mineral potential of a number of small ultramafic bodies and extensive 'metadiorite - gabbro' rocks should be evaluated.
Precambrian rocks of deep river map area, Manitoba
Authors: Bostock H H
Published: March 2016

Deer River map-area lies between 57° and 59°N and 92 ° and 96° W. The oldest rocks are folded basic to acid volcanic and associated sedimentary rocks mostly in the almandineamphibolite metamorphic facies. Hybrid rocks derived from the
volcanics and sediments, were formed during emplacement of later plutonic rocks that range from quartz diorite to granite. K/Ar age determinations on muscovite and biotite from a granodiorite on South Knife River are 1, 660 and 1, 670 ±. 55 m. y. respectively. Clastic sediments are folded and
have undergone lower to upper greenschist facies metamorphism but are not known to be intruded by granitic rocks. Aeromagnetic anomaly patterns suggest that diabase belonging to the Mackenzie dyke swarm intrudes the granitic rocks but no outcrops of diabase are known. Precambrian rocks are
nonconformably overlain by nearly flat lying, predominantly carbonate rocks of lower Paleozoic age. Two occurrences of fluorite in granitic rocks are reported . A calcareous metasiltstone bearing laminae of hyalophane and uvarovite with associated chromite, is described.
Serpentine mineralogy of ultrabasic intrusions in Canada and on the mid-Atlantic Ridge
Authors: Aumento F
Published: March 2016

The serpentines and associated minerals from the stratiform Muskox Intrusion, the Alpine-type Mount Albert and Jeffrey (asbestos) Mine intrusions, and the Mid - Atlantic Ridge were investigated by X-ray diffraction techniques. Lizardite is the predominant mineral
formed in the serpentinization of both the ultramafic and mafic rocks of the Alpine, stratiform and mid-oceanic ridge intrusives. Lizardites from the Mid-Atlantic Ridge were found to have the smallest cell parameters, whereas the largest parameters occurred in the Alpine serpentinites. The latter
were associated with abundant brucite, whereas in the Muskox and Mid-Atlantic Ridge serpentinites brucite was rare. The cell parameters and brucite content variations are indicative of different temperatures of serpentinization of the different intrusive bodies: the hottest temperatures (near 485
° C) may have occurred on the Mid-Atlantic Ridge, intermediate to hot temperatures in the stratiform Muskox Intrusion, and the coolest temperatures (400° Corless) in the Alpine intrusives of Mount Albert and Jeffrey Mine. The latter are thought to have been serpentinized contemporaneously
with the diapiric emplacement of cool, semi crystalline ultrabasic masses, whereas in the stratiform and mid- oceanic intrusives serpentinization probably occurred on cooling after emplacement and after termination of the processes of differentiation by crystal settling.
Some Canadian occurrences of maghemite
Authors: Mcleod C R
Published: March 2016

Maghemite has been found in samples from the lateritic 'buckshot ' ore bands of the Steep Rock Lake iron deposits. Partial chemical analysis of a magnetic concentrate gave 84. 42 per cent Fe 2o3, 0 . 36 per cent FeO, and 2.8 per cent H 2o. The maghemite has a
cell edge of 8 .33 + . 01 A, and an average Vickers microhardness of 920. - Oxidation of magnetite to maghemite is relatively common but not abundant in magnetite-bearing iron ores and iron formations from a variety of geological environments. Maghemite forms as a rim on magnetite grains, or as
irregular linear or cloud-like masses within them. There is apparently some relationship between maghemite development and polarmagnetism of samples.
Fossil statoblasts of Cristatella mucedo Cuvier in the Beaufort Formation and in interglacial and postglacial deposits of the Canadian Arctic
Authors: Kuc M
Published: March 2016

This paper present a description of statoblasts of Cristatella mucedo Cuvier extracted from late Tertiary or early Pleistocene, interglacial and postglacial deposits. The methods of extraction and the paleoecological significance of the statoblasts are presented.
The biostratigraphic importance of statoblasts in sequences consisting of strata produced by aquatic ecotones is also discussed. All locations of subfossil statoblasts are north of the recent northernmost limit of fresh-water bryozoans in Canada. Statoblasts occur most abundantly in interglacial
sapropel and are helpful indicators of general climatic and environmental features of this period.
Geology of the Tuadook Lake map-area, New Brunswick [21J/15]
Authors: Skinner R
Published: March 2016

Tuadook Lake map-area lies in the northeastern part of the Appalachian Mountain system in the central part of the Miramichi Highlands physiographic subdivision. The oldest rocks are Cambro-Ordovician quartzite, phyllite, paragneiss and amphibolite that occupy the
core of a large northeasterly-trending anticlinorium, the Miramichi geanticline. These rocks have undergone metamorphism to the amphibolite grade and at least two periods of deformation. Greens tone, rhyolite, greywacke, slate and conglomerate overlie the metasedimentary rocks conformably. East of
the map-area graphitic slate within the assemblage contains Middle or possibly Late Ordovician graptolites, Cataclastic, commonly foliated to gneissic granitic rocks of Late Ordovician or Early Silurian age cut the metasedimentary rocks and underlie about a third of the map-area, and massive
Devonian granitic and gabbroic rocks cut metasedimentary rocks and the Upper Ordovician or Lower Silurian intrusive rocks. Lower Devonian basaltic, rhyolitic and supposedly cogenetic granitic rocks flank gabbroic and older granitic rocks on the west, The general structural trend of all rocks within
the map-area, except Devonian granitic rocks, is north-northwest athwart the north easterly Acadian orogenic trend. The most prominent structural feature is the Catamaran fault that strikes easterly across the southern part of the map-area and may have a right lateral strike slip of 4 1/2
miles.
Research in geochemical prospecting methods for fluorite deposits, Madoc area, Ontario
Authors: Lalonde J P
Published: March 2016

The known fluorite deposits occur in Precambrian marble and Paleozoic limestone as irregular and discontinuous veins in faults and frac­tures. The veins contain fluorite, calcite, barite, celestite, and minor amounts of sulphides including pyrite, marcasite, and
sphalerite. The secondary dispersion of fluorine was studied regionally by sam­pling 45 soil profiles along two regional traverses, collecting approximately 60 stream sediment, 80 surface water, and 200 groundwater samples. Soils were also collected along seven detailed traverses crossing known
fluorite veins or their extensions. Fluorine was determined by selective ion elec­trode, zinc by atomic absorption spectrophotometry, and barium and stront­ium by X-ray fluorescence. Most rock types of the Madoc area are fluorine-rich and contain between 1,000 and 2, 700 ppm F. Several surface water
anomalies associated with areas of fluorite occurrences were located, and dispersion trains are traceable for several miles. The fluorine content of stream sediments is, however, of limited use in geochemical exploration because of the smalt con­trast between background and anomalous concentrations.
The fluorine content of groundwaters clearly delineates areas containing known fluorite occur­rences as well as other targets of interest; a positive correlation exists between groundwater anomalies and fluorine-rich soils along the regional traverses. The lateral dispersion of fluorine in soils
overlying subcropping fluorite veins is restricted and, therefore, can be used to pin-point such occurrences. The most favourable soil horizon to sample for all elements studied is the organic A horizon which accentuates the contrast between back­ground and anomalous concentrations. Barium and zinc
in soils are also good tracers for fluorite veins; but strontium proved to be ineffective. The water-soluble fluorine content of the A soil horizon can be used as an inex­pensive field test. Geochemical exploration methods proved useful to re-evaluate the potential of the area and can help locate
new deposits.
Carcajou Canyon map-area, District of Mackenzie, Northwest Territories
Authors: Cook D G , Aitken J D
Published: March 2016

The known stratigraphic succession of Carcajou Canyon Map-area exceeds 34,000 feet (10,400 m) in thickness and is unmetamorphosed. Of this thickness, the lower half is an apparently conformable succession of Proterozoic, mainly marine , sedimentary strata with
minor gabbro dykes and sills, tentatively assigned to the Helikian. Paleozoic marine strata mainly of Cambrian, Ordovician and Devonian ages total more than 11,350 feet (3,460 m). The Mesozoic is represented only by a succession of Cretaceous marine and nonmarine, elastic strata, 3,500 feet (1,070
m) in maximum preserved thickness. Cenozoic deposits of probable Eocene age are preserved only locally; they consist of coarse-grained elastic rocks with minor volcanic intercalations. The large-scale and obvious fold and fault structures of the map-area are broadly Laramide (s ensu Zato ) in age,
and are interpreted as due to "thin-skinned" deformation that does not involve the crystalline basement. Antecedent faults of Proterozoic and Paleozoic age are recognized also; some of these have been rejuvenated during Laramide deformation, and have influenced the form of the Laramide structures.
The hydrocarbon potential of the area is low, but the stratigraphic and structural conclusions developed are pertinent to the search for hydrocarbons in adjoining, more prospective map-areas. The potential of the area for metallic deposits is virtually unassessed; however, the presence of a thick
Helikian(?) succession should encourage the search for sedimentary copper deposits.
A progress report on experiments with chemical field tests for the detection of the rare-earth elements cerium and yttrium
Authors: Rose E M
Published: March 2016

This report describes a number of proposed chemical field tests developed by the writer for the detection of cerium and yttrium . The tests were developed to assist the writer in his study of the geology of rare-earth deposits in Canada and they may be of help to
geologists and prospectors who are also concerned with the rare - earth elements. The tests are not yet specific, and further work is required.
Field and laboratory methods used by the Geological Survey of Canada in geochemical surveys. No. 11: Uranium in soil, stream sediment and water
Authors: Smith A Y , Lynch J J
Published: March 2016

Analytical methods used to determine trace quantities of uranium in soil, stream sediment and water are described. These techniques have been tested and used successfully in mobile field laboratories as well as in the headquarters
laboratory.
Precambrian geology of Fond-du-lac map area, [74o] Saskatchewan
Authors: Baer A J
Published: March 2016

The map-area is in northern Saskatchewan, east of Uranium City. South of Lake Athabasca the map-area is underlain by flat-lying sediments of the Athabasca Formation, whereas granitic rocks and gneisses occupy the area north of the lake. The gneisses form two
groups. One group forms a broad belt closer to Lake Athabasca and is in the granulite facies or has undergone retrograde metamorphism from the granulite facies to the amphibolite facies. The other group, associated with granodiorite and migmatite, covers most of the area north of the first. These
rocks are in the amphibolite facies. Rocks of the first group represent supracrustal rocks of various origins raised to granulite facies. They were deformed by a generally easterly trending gentle folding. A second period of metamorphism, associated with emplacement of abundant granitic rocks,
caused a retrograde me tamorphism of these granulites and was accompanied by formation of a northcasterly trending foliation. Faulting and mylonitization are probably related to the last stages of granite and granodiorite emplacement. All known mineral showings are confined to rocks in the granulite
facies of metamorphism.
Paleomagnetic results from the tertiary Mount Barr and Hope Plutonic complexes, British Columbia
Authors: Symons D T A
Published: March 2016

The Hope and Mount Barr felsic plutonic complexes outcrop in the Cascade Mountains in southernmost British Columbia. Intrusive rocks of sialic composition have rarely been studied paleomagnetically because of remanence instability, however, a stable primary
remanent magnetization has been isolated in 5 of 7 sites from each complex after alternating field demagnetization. Individual plutons within each complex give coherent clusters of either normal or reversed remanence directions indicating that they were intruded and cooled sequentially rather than
concurrently. The upper Eocene to lower Oligocene Hope complex gives a p ole position of 15l.9°W, 87.7°N (om 6.1°, l\p 5,1°) which is concordant with poles from coeval North American units. The mid-Miocene Mount Barr pole position of 85.8°W, 72.4°N (om 14.6°, op 13
.3°) is slightly discordant possibly because of non-representative sampling. The results suggest that these complexes have not been rotated relative to the North American craton since their emplacement.
Medial Lower Cambrian trilobites from the Mackenzie mountains northwestern Canada
Authors: Fritz W H
Published: March 2016

Seventeen species of trilobites are described from the Mackenzie Mountains. They belong to nine new species, one established species, and seven unnamed species. One new genus, Ekwipagetia, is described. All of the trilobites are from strata that correlate with
the NevadeZZa Zone and are from the Sekwi Formation. At least part of the fossils are from the outer detrital belt, a belt of strata ringing the craton and lying seawards of a middle carbonate and an inner detrital belt. Few of the trilobites are similar to those described by Fritz (1972) from the
nearby middle carbonate belt, trilobites that we r e used to establish a Lower Cambrian zonation for the North American Faunal Province. Since this zonation seems to work well in the middle and inner detrital belts, a major alteration of the zonation to include the present fossils is not
recommended. Instead, it seems that a new zonati on for the Lower Cambrian fossils in the outer de trital belt might be more useful, but the description of more fossils is necessary before this idea can be either confirmed or rejected.
Elemental associations in mineral deposits and indicator elements of interest in geochemical prospecting
Authors: Boyle R W
Published: March 2016

This report contains numerous data on the elemental associations in all types of mineral deposits and discusses the use of various indicator elements in geochemical prospecting.
Development of uranium exploration methods using adon
Authors: Dyck W
Published: March 2016

This report gives the results of tests carried out during the 1968 field season to determine the applicability of the radon method for detailed prospecting for uranium. Radon tests in surface waters and in soils were carried out in three different geological
environments; the Gatineau Hills, Quebec, and Sudbury and Elliot Lake, Ontario. In the Gatineau Hills, seasonal variations, variations with depth of lake, with distance from shore, and with distance from uranium occurrence along shore, were studied. The results suggest that surface and underground
water drainage is responsible for the radon and radium in the lake systems. Where the overburden is one or two feet thick on-site radon and thoron determinations in soil emanations in the Gatineau Hills outlined radioactive pegmatites somewhat more clearly than did gamma-ray tests. Although radon
levels varied by a factor of two, anomalies related to source were detected throughout the field season. A radon anomaly, detected in a reconnaissance survey of the surface waters of the eastern quarter of the Sudbury irruptive, appears to be similar in origin to the anomalies investigated in the
Gatineau Hills. Radon and gamma-ray levels across the copper-nickel ore borders were comparatively low and meaningless. In the Elliot Lake area the distribution of radon in four lakes was studied; two in the contaminated westward drainage channel of the southern limb of the Quirke syncline, and two
in uncontaminated terrain overlying the uranium-ore-bearing Matinenda Formation. The results from the contaminated lakes demonstrate some of the principles of the radon prospecting method very well except for the fact that man, rather than nature, introduced the radium which gives rise to the high
radon levels in the water system. The radon levels in the uncontaminated lakes are at least a factor of ten lower than in the contaminated lakes, and straddle the sensitivity limit of the instrument. Some shallow creek deltas are reflected in the radon profiles 50 feet from the mouth of the creek
and hence could serve as starting points for regional investigations. Relative to the lakes in the Gatineau Hills, the radon levels in the two uncontaminated lakes in the Elliot Lake region are low. Regional backgrounds, rather than absolute radon levels, must therefore be employed to determine
anomalies. On-site radon determinations in soil emanations across the uranium ore zone at the Rio Algom Quirke Mine outline the ore zone more distinctly than do gammaray determinations. Soil tests across the projected contact of the Matinenda Formation in the southern limb of the Quirke syncline
gave a negative anomaly at the contact. In general the investigations have shown that depending on the medium and sampling density employed, the radon method can outline radioactive sources on a reconnaissance scale as well as on a more detailed scale.