bluuebunny/crossref_metadata_2025 huggingface dataset:
Preliminary results of the 1997 Polar Margin Aeromagnetic Program survey of northern Greenland and the Lincoln Sea
Authors: Nelson J B , Damaske D , Marcotte D , Hardwick D , Forsyth D , Keating P , Pilkington M , Okulitch A
Published: September 2013

In 1997, in conjunction with the Polar Margin Aeromagnetic Program, 13 000 line-kilometres of aeromagnetic data were collected at a line spacing of 3 km. Lines were flown at a constant altitude of 300 m over the Lincoln Sea and in draped mode over northern
Greenland. New data provide the first magnetic map of the Kap Washington volcanic province on northern Greenland. Anomalies indicate extensions of tectonic elements mapped from existing data and new magnetic signatures of regional structures. These include: 1) a magnetic low following the Harder
Fiord fault zone and area to the south, 2) high frequency, north-south anomalies characterizing dyke swarms south of Kap Washington, 3) a margin-parallel zone of high-amplitude, short-wavelength anomalies extending 40 km offshore, 4) large amplitude, long-wavelength highs over the Arctic Ocean north
of Greenland and 5) high-amplitude, linear anomalies near the continental shelf break north of Ellesmere Island.
Small air-gun arrays for high-resolution marine geophysical surveying
Authors: Mosher D C , MacDonald R , Hewitt A , Hill W
Published: September 2013

Careful monitoring of the seismic source signature and implementation of two-gun arrays can greatly enhance the data quality of high-resolution, air-gun, seismic-reflection surveys. The goal of this study was to design and implement an array of small air guns for
seismic-reflection surveying that would maximize resolution and eliminate or significantly reduce the bubble pulse, reducing the need for post-processing. It is the first step in an attempt to develop and improve the standard operating procedures for collecting marine high-resolution
seismic-reflection data within the Geological Survey of Canada with tools that are already available. Arrays of small coalesced air guns, tuned to optimize frequency and source shape, can eliminate the bubble pulse while maintaining resolution and increasing power. Arrays which employed guns of
equal size were most effective at eliminating the bubble pulse. Arrays at a shallow tow depth (0.5 m) were most effective at producing high-resolution, broadband signals.
Aeromagnetic survey program of the Geological Survey of Canada, 1997-1998
Authors: Dumont R , Kiss F , Tod J
Published: September 2013

In 1997, four high-resolution, regional aeromagnetic surveys totalling 168 917 line kilometres were flown over Baffin Island, southern Saskatchewan, and northern British Columbia. One of these surveys was funded by private industry, the Geological Survey of
Canada provided complete funding for two surveys, and one survey was cost-shared by the Geological Survey of Canada and partners. One detailed helicopter-borne electromagnetic/ magnetic/gamma-ray spectrometric survey totalling 10 632 line kilometres was flown in New Brunswick. This survey was funded
by the Province of New Brunswick. The program to level the Canadian aeromagnetic profile data set, for the elimination of survey boundary effects, proceeded with drape computation and levelling of surveys flown at constant altitude in British Columbia and western Alberta. An aeromagnetic/gamma-ray
spectrometric survey flown in Guinea West Africa has been supervised by the Geological Survey of Canada.
Ten things the textbooks don't tell you about processing and archiving airborne gamma-ray spectrometric data
Authors: Grant J A
Published: September 2013

Techniques used for acquiring and processing (correcting) airborne gamma-ray spectrometry data are well documented. However, these publications have not addressed some of the more subjective aspects of this process, such as filtering, presentation, and archiving
of the data. This paper discusses some of the often overlooked, but important issues related to the proper handling of airborne gamma-ray spectrometry data.
The geology of Devon Island north of 76°, Canadian Arctic Archipelago
Authors: Mayr U , de Freitas T , Beauchamp B , Eisbacher G
Published: September 2013

Devon Island north of 76° comprises Grinnell Peninsula and a land area to the east, which is connected to the main part of Devon Island farther south. The study area is the geographic centre of the Canadian Arctic Islands and is also a geological centre in
the sense that a number of different stratigraphic and tectonic trends converge and interact there. It straddles the Paleozoic platform-basin boundary and the southern margin of the younger Sverdrup Basin. The northerly fold trends of the Boothia Uplift-Cornwallis Fold Belt and the westerly trends
of the Central Ellesmere Bold Belt intersect on Grinnell Peninsula.
The total exposed succession on northern Devon Island is more than 9000 m thick and contains two major unconformities that correspond to the Cornwallis Disturbance and the Ellesmerian Orogeny. The Cambrian to Lower Devonian formations, affected by the Cornwallis Disturbance, consist of shelf
carbonates and evaporites that grade westward and northwestward to pe(itic basinal sediments. The facies transition is marked by the development of large reefs at various stratigraphic levels
The Middle and Upper Devonian succession was deposited during the interval between the Cornwallis Disturbance and the Ellesmeriun Orogeny. It consists of a lower carbonate unit that onlaps the Cornwallis Fold Belt, and grades up into nonmarine sandstones, which are the fill of the
southeastward-advancing Ellesmerian foreland basin.
The formations of the post-Ellesmerian Sverdrup Basin constitute a thin, mixed carbonate- clastic, basin-margin succession that ranges in age from EarIy Carboniferous to Early Triassic.
Upper Cretaceous to Miocene, poorly consolidated shale and sandstone lie unconformably on lower Paleozoic rocks and are preserved in several small grabens. The Eurekan Orogeny produced a northwest-trending thrust belt and large, southeast-trending strike-slip zones that may still be active.
Grinnell Peninsula lies north of and on structural strike with the Little Cornwallis lead- zinc district, but there are no known economic mineral occurrences on the peninsula.
Liturgical guidelines for congregations to have a voice in the serious problem of economical inequality in South Africa
Authors: De Klerk Barend J.
Published: September 2013

It is part of the calling of the church to address issues of justice and peace, and to care for the poor and the marginalised in society, because the church is the body of Christ and therefore the heart and hands of Christ in this world. In this article, the problem statement is: ‘How can liturgical guidelines help churches to become involved in the economic inequality and the consequent poverty in our society?’ Richard Osmer articulates a practical theological method that is largely employed in this research. South Africa is the world’s most unequal nation. The South African economy grew steadily from 1992 to 2008, but the benefits were distributed unequally, such that income inequality actually worsened. It is necessary to get a truthful starting point for the church to address this need − and the best way will be to discover the identity of the church. The church’s identity is described in the liturgical sense in three phases of involvement in society, namely (1) the gathering and sending of the local congregation; (2) the liturgical responsibility with the ecumenical church; and (3) the possible cooperation with those who do not share the Christian faith.Deel van die kerk se roeping is om aangeleenthede soos geregtigheid en vrede aan te spreek, asook om vir armes en gemarginaliseerdes in die samelewing te sorg. Die kerk is immers die liggaam van Christus en daarom die hart en hande van Christus in die wêreld. Die probleemstelling van hierdie artikel is: ‘Hoe kan liturgiese riglyne kerke help om betrokke te raak by die ekonomiese ongelykhede en gevolglike armoede in die Suid-Afrikaanse samelewing?’ Richard Osmer bied ’n prakties-teologiese metode wat met vrug gebruik is in hierdie navorsing. Suid-Afrika is die wêreld se mees ekonomies-ongelyke nasie. Die Suid-Afrikaanse ekonomie het van 1992 tot 2008 stelselmatig gegroei, maar die voordele daarvan is sodanig versprei dat die ongelykheid in inkomste toegeneem het. Dit is nodig om ’n betroubare vertrekpunt vir die kerk te vind om hierdie probleem te hanteer – en die beste wyse is om by die identiteit van die kerk aansluiting te vind. Die identiteit van die kerk in die liturgiese sin word in drie fases van betrokkenheid in die samelewing beskryf: (1) die vergadering en uitstuur van die plaaslike gemeente; (2) die liturgiese verantwoordelikheid tesame met die ekumeniese kerk; en (3) die moontlike samewerking met hulle wat nie in die Christelike geloof deel nie.
Die wet is evangelie: Die Heidelbergse Kategismus steeds aktueel na 450 jaar
Authors: Strauss Piet
Published: September 2013

In die denke van Martin Luther bestaan daar spanning tussen die wet van God en die evangelie. Vir Luther is liefde die eie werk en die wet die vreemde werk van God. Daarteenoor integreer of versoen Johannes Calvyn God se wet met die evangelie. Hy vertolk die openingswoorde van die wet byvoorbeeld as liefdevol en bevrydend en daarom evangelies. Calvyn beskou die wet as die manier waarop ’n Christen sy liefde vir God uitleef en sy dankaarheid teenoor God vir sy verlossing betoon. Calvyn se siening oor die verhouding tussen die wet en die evangelie het ’n betekenisvolle invloed op die Heidelbergse Kategismus se formulering ten opsigte van hierdie saak. Volgens die Kategismus is die wet evangelie, of die vorm wat die evangelie in die lewe van die mens aanneem.In the thought of Martin Luther tension exists between the law of God and the gospel. Luther regards love as the own work of God and the law as something strange to the Lord. John Calvin, however, integrates Gods law and the gospel to the extent that the opening words of the ten commandments are regarded as words of love and redemption and therefore evangelical. To Calvin the law becomes the way in which a converted Christian lives and shows his gratitude to God for his salvation. Calvin’s view on the relationship between law and gospel had a significant influence on the way in which the Heidelberg Cathecism formulates these two concepts. For the Cathecism the law is gospel or the form in which the gospel takes shape in human life.
Die teken van Jona en Jesus as Messias
Authors: Deist F. E.
Published: September 2013

The sign of Jonah and Jesus as MessiahJewish tradition and the contexts in which Matthew and Luke refer to the "sign of Jonah" suggest that the sign demanded of Jesus by the authorities should prove his prophetic authority for deviating from traditional Torah. In the light of Jewish tradition on Jonah ben Amittai as the (Ephraimite) Messiah ben Joseph the mention of the sign itself may suggest that, at least in Matthew, Jesus claims messianic authority, and implies his eschatological victory over all evil powers, leading to the messianic banquet of believers.
Lewensgemeenskap met God as essensie van Bybelse spiritualiteit
Authors: Du Toit A. B.
Published: September 2013

Living communion with God as essence of biblical spiritualityOur age experiences an urgent need for real spirituality. This article is intended as a further contribution to the local discussion on this topic. Life-long communion with God is highlighted as the essence of biblical spirituality, although the Bible contains different traditions and types in this regard. The most important aspects of this living fellowship with God is the praesentia Dei, the relational framework within which it takes place, metaphors reflecting its existence, specific moments of meeting with God, and its ethical and eschatological edges.
Plaaslike ekumene en die einddoel van die eenheidstrewe
Authors: Gous A. G. S.
Published: September 2013

Local ecumenism and the goal of the ecumenical endeavourAccording to the author the need for local ecumenism arises from the fact that nowadays there is not only the one universal church in many localities as in the early church but a new reality of many churches in one locality - a situation unknown to the Mew Testament. The quest for unity should therefore primarily originate from the local congregation. Gous clarifies the concept “local” and defines the ecumenical activity as such. He describes and evaluates five models for church unity: (i) organic unity, (ii) conciliar fellowship, (iii) reconciled diversity, (iv) communion of communions, and (v) unity as solidarity. He closes his article by listing reasons why churches remain caught in a situation of mutual exclusiveness, instead of full communion. A distorted relationship between unity and truth is one of the primary reasons.
Sosiologiese eksegese van die Ou Testament geïllustreer aan die hand van Klaagliedere 3
Authors: Gous I. G. P.
Published: September 2013

Sociological exegesis of the Old Testament with particular reference to Lamentations 3People experience change as a traumatic rearrangement of their life anchors. It is possible for religion to play a positive role in the process of coming to terms with change. The book of Lamentations is representative of an attempt to interpret the loss of anchors to the people of Jerusalem in 586 B.C. We can draw from their experiences only if we come to understand their world. Sociological exegesis provides invaluable insights to this effect. The history of sociological exegesis in the study of the Old Testament is briefly sketched, followed by an overview of the book of Lamentations, with particular reference to Lamentations 3, as an example of this type of exegesis.
Die besondere betekenis van die Psalms in die Christelike Kerk
Authors: Barnard A. C.
Published: September 2013

The exceptional value of the Psalms in the Christian churchThe Psalms have a special place in the Bible as God's great prayer and hymn book. It is the work of various people, under the most representative situations, but it is also the work of the Holy Spirit. The Psalms express the lives, struggles, joy and praise of people before God with great clarity and true compassion. Their experiences of life, seen in the light of the living God, are vivid and real. The Christian Church took over the Psalms as their own, after the example of Jesus, whose life and work was seen as pictured in them. It became their prayer and hymn book - their life guide. The message of the Psalms is of such exceptional spiritual depth, expressing in great clarity every human need and emotion before God, that the Christian Church could find and understand itself in those situations and could associate itself with it.
Nie goedgelowig nie, maar gelowig en goed: oor die uitdaging van beter morele vorming in en deur gemeentes
Authors: Burger C.
Published: September 2013

Moral renewal: a challenge to the churchesThe article addresses the issue of moral formation in the South African society and focuses on the role the Christian churches can play in this respect. It argues that the church can indeed play a vital role, if it succeeds in facing up to at least four challenges. The first one has to do with a stronger emphasis on the moral implications of the gospel on congregational level. Too many churches preach a version of the gospel that lacks clarity about the moral commitment asked of disciples. The second challenge is to get a more focused picture of what an intrinsic Christian lifestyle looks like. A plea is made for the reinstatement of a condensed basic moral code grounded in biblical teaching. The third challenge relates to the vital question of how moral formation is actually being implemented in the faith communities. Attention is given to different ways this question is being answered. The fourth challenge concerns the churches' hesitancy to accept co-responsibility for the public communities we are living in. Congregational and denominational leaders have to realize that churches are called not only to discipleship, but also to citizenship. If the churches are willing to accept these challenges, they can be an important factor in the moral renewal of the South African society.
’n Ellips skeppingsgebeure in die Evangelieverhaal volgens Johannes
Authors: Du Rand J. A.
Published: September 2013

Ellipse creation events in the Gospel story according to JohnThe narrative of the Fourth Gospel can be read from different viewpoints. From the perspective of the creation motif the unfolding of the story can be compared to an ellipse, emphasising two focal creation moments: the incarnation of the Logos (1:1-18) and the bestowment of the Spirit onto the disciples (20:21-23). These two creation moments are part of a literary comparison between creation and "new creation".
Het publieke karakter van de kerk
Authors: Heitink G.
Published: September 2013

The public character of the churchThe subject of this article is the public character of the church. In the Netherlands one can make a distinction between three actual models. Each of them has had influence on the relationship between church and society in a particular time of history. The first model of A Kuyper, has its roots in the Reformed Churches in the Netherlands (Gereformeerde Kerken) and was important in the first half of the 20th Century. The second model is rooted in the Reformed Church (Nederlandse Hervormde Kerk) of the Netherlands in the period after World War 2. The third model is the ecumenical model of the "church for others", related to the secularized society. In each of these models we can find building blocks for the fourth model, called "open church", which has to be developed in this time of rapid social changes. In this article, the author tries to develop a design for the fourth model. This article is written out of the context of Western Europe. I hope it also can be helpful in the context of South Africa.
Stromab - Gedanken zur Hermeneutik biblischer Texte im Kontext der neueren angelsächsischen Diskussion
Authors: Loader J. A.
Published: September 2013

Downstream - On Biblical hermeneutics in the context of the recent Anglo-Saxon debateThis paper, delivered at the 2000 meeting of the Rudolf Bultmann Society at Hofgeismar in Germany, offers a survey of recent developments in literary criticism in the English-speaking world. Contributions to the systematic reflection on issues relevant for theology are also considered and the author’s own proposal is outlined. It is argued that the hermeneutic character of theology remains necessary in the Christian tradition. This is, however, not founded on the proposition of the linguistic nature of revelation, but on the fact that theology is the reflective human speaking about God.
‘Telling a past, dreaming a future’ (Walter Brueggemann) - Die essensie van die narratiewe pastoraat
Authors: M J. C. , Laas J.
Published: September 2013

“Telling a past, dreaming a future” - The essence of narrative pastoral counsellingThe article examines the possibilities of negotiating the double movement created by living towards the future and dreaming out of the future into the present. Story telling in the pastoral environment is suggested as a means of bringing together the past and the expected future. A circular approach to time can help immensely by bringing together past and future in a meaningful way. This becomes possible in the pastoral environment where there is real understanding between pastor and client through thorough communication and the reframing of the past. The importance of language in understanding and the transformative power of narrative are stressed, as well as Christian hope as the most fundamental way of finding meaning out of the future into the present.
Die Barmhartigheidsbediening van die NG Kerk van Natal - afhanklik en eksklusief?
Authors: Van Aarde R. B.
Published: September 2013

The ministry of compassion of the Dutch Reformed Church in Natal - dependent and exclusive?This study highlights two major concerns in the history of the Dutch Reformed Church of Natal’s ministry of compassion. The church’s work became financially too dependent on government subsidies. The work originally started off with church finances, but was later financed by government. In principle there is nothing wrong with such a partnership, but the present financial dependency will have to make room for an independent ministry of compassion. The church’s ministry of compassion was also mainly focussed on the Afrikaner nation. In this the church supported the apartheid system of the day and started the perception that services of compassion are for the White community while missionary work is focussed on the Black communities. What history teaches us in this field of compassion and caring can help to rectify the ministry of compassion of the Dutch Reformed Church in KwaZulu/Natal and help the church to avoid the same mistakes in future
Metaforiese elemente in die forensiese taalgebruik van die Johannesevangelie
Authors: Van der Watt J. G. , Voges L.
Published: September 2013

Metaphorical elements in the use of forensic language in the Gospel according to JohnThe metaphorical nature of the forensic material in the Gospel of John, leads to the conclusion that more than one courtcase is actually implied. Parallel to the earthly courtcase of Jesus, a spiritual courtcase, where the roles are reversed, is taking place. From these two courtcases, a third one (also spiritual) develops. In this third courtcase, the real reader has to make a decision - for Jesus or against Jesus?
Cheating at the market place - impressions from Micah 6:9-16
Authors: Wessels W. J.
Published: September 2013

Reading an ancient text is a problematic endeavour. In this article, Micah 6:9-16 is read as part of the final composition of the book of Micah. The text is read with an openness to the impressions it creates on a modern reader, like the researcher. These impressions are then related to modern day context, both church and society.
Theological education in an ecumenical context: Principles and procedures of the Pretoria model
Authors: Wethmar C. J.
Published: September 2013

During the past three years the Faculty of Theology at the University of Pretoria was involved in a profound process of transformation. In this article, the historical background of the faculty is briefly described as well as the basic characteristics of the present-day South African tertiary education scene in which this process took place. This is followed by an analysis of the basic principles and procedures of the transformation process. Special emphasis is placed on the ecumenical ideal that inspired the development of the new faculty.
Die NG Kerk en Gereformeerdheid: Gestalte en uitdagings
Authors: Wethmar C. J.
Published: September 2013

The Dutch Reformed Church and the Reformed tradition: expression and challenges In this article a brief analysis is presented of the manner in which the Reformed tradition finds expression in die Dutch Reformed Church in South Africa. Such an analysis presupposes answers to the questions why such an attempt is necessary and what the identity of the Reformed tradition is. These answers are suggested in the first two sections of the article. The third section contains the envisaged outline of the manner in which the Dutch Reformed Church represents the Reformed tradition. This leads to the conclusion that the contribution which this church could strive to make to the church scene in South Africa is to promote the combination of the faith dimensions of knowledge, experience and obedience which is characteristic of the Reformed tradition.
Theology chronicle - Opening words at the graduation ceremony at the University of Pretoria (Part 4 - Law, Theology & Veterinary Sciences) 27 March 2001
Authors: Sinclair J. D.
Published: September 2013

The mission of the University of Pretoria, to be an internationally competitive and locally relevant, comprehensive research institution is by now deeply entrenched in the minds of all its stakeholders. This mission, to which we remain steadfastly committed, will ensure that the qualifications obtained by students at this University will serve them well in the development of their future careers. Through our efforts to steer a strong and sound vessel safely through the turbulent waters that characterise the higher education sector, we are able to say, with confidence, to all of you, that you can and should be proud to become a Tukkies graduate.
Liefde en situasie-etiek
Authors: Heyns J. A.
Published: September 2013

Ons bedoeling is nie om 'n omvattende uiteensetting te gee van of indringende kritiek te lewer op die situasie-etiek in die algemeen nie. Ons wil hier bloot net, inleidend en kursories, die plek van die liefde en die funksie van die liefdeseis in die situasie-etiek van naderby bekyk. Oor die noodsaaklikheid van so 'n onderneming hoef nie gedebatteer te word nie. Wie met die literatuur vertroud is, sal weet hoe aktueel tipiese argumente vanuit die situasie-etiek-denke tans is.
Verslag: Bywoning van buitelandse internasionale konferensies
Authors: Prinsloo W. S.
Published: September 2013

Dit was my voorreg om in Augustus 1980 twee buitelandse internasionale konferensies oor die Ou Testament by te woon en ook ’n voordrag te lewer. Hierdie is ’n poging om die hoofmomente van die kongresse saam te vat en om dit wyer bekend te stel.
Die drie Afrikaanse Kerke - 'n kontemporêre uitdaging
Authors: Van der Watt P. B.
Published: September 2013

Vanaf die volksplanting in 1652 vir meer as tweehonderd jaar sou daar net één kerk onder die Hollands- en later die Afrikaanssprekende deel van die Suid-Afrikaanse bevoIking wees. Net na die helfte van die negentiende eeu verskyn daar egter 'n diversiteit op die Afrikaner se kerklike kaart: daar bestaan voortaan drie Afrikaanse kerke te wete, die Nederduitse Gereformeerde Kerk, die Nederduitsch Hervormde Kerk van Afrika en die Gereformeerde Kerk in Suid-Afrika.
Chiasmes in Maleagi 1:2–5
Authors: Snyman S. D.
Published: September 2013

Hierdie artikel beoog om die chiasmes in Mai 1:2–5 aan te dui. ’n Noukeurige ondersoek van die perikoop toon aan dat daar minstens drie chiasmes in die gedeelte is en dat die makrostruktuur van die perikoop ook chiastiese trekke vertoon.
A Simplified Method for Routine Outcome Monitoring after Drug Abuse Treatment
Authors: Lennox Richard d. , Sternquist Marie A. , Paredes Alfonso
Published: September 2013

The routine collection of drug treatment outcomes to manage quality of care, improve patient satisfaction, and allocate treatment resources is currently hampered by two key difficulties: (1) problems locating clients once they leave treatment; and (2) the prohibitive cost of obtaining meaningful and reliable post-treatment data. This pilot describes precise methods for an economical staff-based routine outcome monitoring (ROM) system using an 18-item core measure telephone survey. As implemented at NarcononTM of Oklahoma, a behavioral and social skills based, residential drug rehabilitation program, the system was psychometrically adequate for aggregate reporting while providing clinically useful information. Standardized procedures for staff training, collecting client contact information, structuring exit interviews and maintaining post-treatment telephone contact produced follow-up rates that improved from 57.6% to 100% over the course of the project. Aggregate data was used to improve program delivery and thereby post-treatment substance use and social outcomes. These methods and use of data may contribute to the discussion on how to best monitor outcomes.
Simple sequence repeat-based identification of Canadian malting barley varieties
Authors: Perry Daniel J. , Fernando Ursla , Lee Sung-Jong
Published: September 2013

Perry, D. J., Fernando, U. and Lee, S-J. 2014. Simple sequence repeat-based identification of Canadian malting barley varieties. Can. J. Plant Sci. 94: 485–496. Practical and reliable means to identify barley varieties are required to provide assurances in segregated grain handling and for quality control in the malting and brewing industry. A set of 10 simple sequence repeat (SSR) markers was selected to differentiate among malting barley varieties grown in Canada. Modification of some PCR primers permitted assembly into two five-marker multiplexes that may be examined simultaneously using an electrophoresis-based DNA analyzer. These markers were surveyed in multiple individual kernels of each of 48 barley varieties grown in Canada, including 31 malting varieties and 17 popular feed varieties. Variation within varieties was common and three general categories of intra-variety polymorphism were recognized: (1) primary biotypes, which were characterized by a fairly even distribution of two alleles at one or more marker loci and complete mixture of allele combinations among the polymorphic loci; (2) uncommon, distinctly different variants; and (3) putative recent SSR mutations. Differentiation among varieties was complete with the exception of one pair of related six-row feed varieties (AC Rosser and AC Ranger) that was indistinguishable and one group of three very closely related two-row malting varieties (CDC Kendall, CDC PolarStar and Norman) that, on an individual-kernel basis, were only partially distinguishable using these markers. Simple, rapid individual-kernel DNA preparation methods were also developed for use in conjunction with the multiplexed markers to provide a convenient, effective and relatively inexpensive tool that may be used for barley variety identification, purity analysis or quantification of variety mixtures.
Congruence Relations for Shimura Varieties Associated withGU(n–1, 1)
Authors: Koskivirta Jean-Stefan
Published: September 2013

We prove the congruence relation for the mod–preduction of Shimura varieties associated with a unitary similitude groupGU(n– 1, 1) over ℚ whenpis inert andnodd. The case whennis even was obtained by T. Wedhorn and O. Bültel, as a special case of a result of B. Moonen, when theμ–ordinary locus of thep–isogeny space is dense. This condition fails in our case. We show that every supersingular irreducible component of the special fiber of p–ℐsog is annihilated by a degree one polynomial in the Frobenius elementF, which implies the congruence relation.
Contemporary Issues in Clinical Dental Teaching
Authors: Groenlund Catherine , Handal Boris
Published: September 2013

Aim

This research project sought to explore the issue of what constitutes effective clinical teaching in the minds of both students and teachers.

Background

As stakeholders of the dental clinical setting, teachers and students have valuable practical insights to share with the academic and professional community as to what constitutes effective dental teaching.

Case description

An explorative qualitative study of dental teachers’ and students’ perceptions of clinical teaching was carried out at the Faculty of Dentistry of Sydney University. Thirty-one clinical teachers and 12 students participated in this case study through an online questionnaire survey and a focus group, respectively. Responses were categorized in three major clusters, namely, instructional, curricular or organizational.

Conclusion

The findings reveal that both groups hold similar opinions on what constitutes effective clinical instruction including a shared passion for learning and teaching, being clear and organized, demonstrating clinical competencies as well as engaging in professional self-reflection. Most of the issues fell into the instructional cluster where establishing a positive relationship with students including providing constructive feedback at the clinical session came up as key factors contributing to the student experience.

Clinical significance

There is a demand from both students and teachers to standardize clinical procedures and protocols as well as having a greater synchronization in time and content between lectures and clinical work.

How to cite this article

Groenlund C, Handal B. Contemporary Issues in Clinical Dental Teaching. J Contemp Dent Pract 2013;14(3):501-510.
Attitude of General Dental Practitioners toward Root Canal Treatment Procedures in India
Authors: Bhondwe Sarvesha , Jain Deepak , Gaikwad Ashwini , Rane Prasad , Doshi Saurabh
Published: September 2013

Objective

The percentage of general dental practitioners is very common in India, so the purpose of this study was to assess attitude of general dental practitioners toward root canal treatment (RCT) procedures.

Materials and methods

In a cross-sectional study, 178 dentists (96 males and 82 females) were surveyed using a selfadministered, structured questionnaire pretested through a pilot survey. The questionnaire collected information regarding RCT procedures among participants. Data were analyzed using SPSS version 15. Frequency and percentage distributions were calculated.

Results

In the present study most of the participants, i.e. 86.4% reported that they perform (RCT) procedures in posterior teeth. Isolation is mainly done with cotton rolls only (74.6%) and very few are using rubber dam in their practice (3.2%). Radiographs were not taken after every step in most of the cases. Rotary instruments were used in less number of cases and K-files were the most popular instruments (66.2%). Also single sitting RCT was not commonly seen.

Clinical significance

This study indicates that most of the general dental practitioners’ do not comply with quality standards guidelines such as use of rubber dam as isolation. So dentist should update their knowledge and practices with current techniques and materials through CDE programs.

How to cite this article

Gaikwad A, Jain D, Rane P, Bhondwe S, Taur S, Doshi S. Attitude of General Dental Practitioners toward Root Canal Treatment Procedures in India. J Contemp Dent Pract 2013;14(3):528-531.
Johanson-Blizzard Syndrome: Dental Findings and Management
Authors: Santhosh BP , Jethmalani Preeti
Published: September 2013

Aim

Oral rehabilitation of a child with Johanson-Blizzard syndrome (JBS).

Background

JBS is an extremely rare inherited disorder characterized by unusually small nose that appears ‘beak shaped’ due to the absence (aplasia) or underdevelopment (hypoplasia) of the nostrils (nasal alae), abnormally small, malformed primary (deciduous) teeth and misshapen or absent secondary (permanent) teeth, hearing disorder, hypothyroidism, dwarfism, malabsorption and mental retardation. It is sometimes described as a form of ectodermal dysplasia.

Case report

Oral findings in JBS are very obscure in the literature. The present report describes oral findings in an 8 years old boy with JBS and his oral rehabilitation.

Conclusion

JBS has an emotional consequence for the affected individuals at early ages. Oral rehabilitation in this case had a very positive impact on the child's mind.

Clinical significance

Early identification and treatment of this disease is of great importance to rehabilitate the patient on functional, esthetic and psychological front.

How to cite this article

Santhosh BP, Jethmalani P. Johanson- Blizzard Syndrome: Dental Findings and Management. J Contemp Dent Pract 2013;14(3):544-547.
Ameloblastic Fibrodentinoma: Report of a Rare Case
Authors: Salehinejad Jahanshah , Langaroodi Adineh Javadian , Shahakbari Reza , Yazdani Neda
Published: September 2013

Aim

This is to report a rare case of ameloblastic fibrodentinoma (AFD), including detailed history, histopathologic as well as radiographic findings. Her condition, a mixed odontogenic tumor, has rarely been reported in publications. We also included the gist of theories put forward regarding the histogenesis of this lesion.

Background

AFD is a rare and controversial entity; it boasts a variety of classifications and terminology based on its unique biological nature as well as histopathological features.

Case description

The patient was a 13-year-old girl with a chief complaint of central unerupted tooth on the left mandible. Cone beam computed tomographic images revealed a mixed pericoronal and multilocular lesion surrounding the crown of the aforementioned tooth, displacing it apically to a large extent.

Conclusion

It is important to differentiate AFD from other benign mixed odontogenic tumors with similar radiographic appearance because of different therapeutic approaches in some of these tumors.

Clinical significance

From the clinical point of view, it is of paramount significance for dental practitioners to assess any delayed tooth eruption (more than 6 months and in comparison with its counterpart on the opposite side) radiographically to ascertain or rule out any such similar lesions.

How to cite this article

Salehinejad J, Langaroodi AJ, Shahakbari R, Yazdani N. Ameloblastic Fibrodentinoma: Report of a Rare Case. J Contemp Dent Pract 2013;14(3):548-551.
Preoperative Gingival Conditioning as a Guide for Implant Installation and to achieve Proper Dentogingival Contours
Authors: Tonetto Mateus Rodrigues , Bandéca Matheus Coelho , de Jesus Tavarez Rudys Rodolfo , Malheiros Adriana Santos , Benatti Bruno Braga
Published: September 2013

A successful esthetic outcome for implant-supported dentures depends on the careful manipulation of peri-implant tissue as well as the precise placement of the implant. In addition, careful surgical and prosthetic planning is essential for esthetically important areas, especially in partially edentulous cases. This study describes a clinical case that presented absent maxillary central incisors in which prior prosthetic planning was used to perform provisional restorations, that was used to condition the gingival tissues and guide implant installation. These procedures made it possible to achieve a dentogingival contour, interdental papillae, and an emergence profile in the edentulous area. The techniques outlined here proved to be sufficient and support the peri-implant tissues to create a more esthetic final prosthesis.

How to cite this article

de Jesus Tavarez RR, Malheiros AS, Benatti BB, Tonetto MR, Bandéca MC. Preoperative Gingival Conditioning as a Guide for Implant Installation and to achieve Proper Dentogingival Contours. J Contemp Dent Pract 2013;14(3):560-566.
Analysis of the Peri-implant Soft Tissues in Contact with Zirconia Abutments: An Evidence-based Literature Review
Authors: Mazaro José Vitor Quinelli , Goiato Marcelo Coelho , Santos Daniela Micheline dos , de Medeiros Rodrigo Antonio , Vechiato-Filho Aljomar José
Published: September 2013

Aim

The aim of this study is to evaluate through a literature review, the soft tissue response in contact with zirconia abutments, including case reports comparing prosthetics rehabilitations with zirconia and titanium abutments upto 3 years of follow-up as well as the factors that should be considered on implant's abutment selection.

Background

Metallic abutments can provide grayish color when in contact with thin soft tissues which may lead the implant prosthetic treatment to failure. In this context, the abutments of zirconia stand out because there is an excellent linking between esthetics and the health of peri-implant soft tissues.

Materials and methods

A consult of the published researches was made on the PubMed database from 2000 to September 2012. The including criteria were: literature reviews, clinical studies and case reports in English that focused on the response of the soft tissue in contact with zirconia implant abutments. The studies that were not in English and did not match the tackled issue were excluded.

Results

A total of 32 articles were found. According to the search strategy, just 16 articles were selected for this review. Three studies affirmed that zirconia abutments have an excellent soft tissue response; one study showed increased gingival recession with zirconia abutments and nine studies do not stand out any difference on biological behavior between titanium and zirconia abutments. Three studies affirmed that zirconia abutments provide natural gingival appearance, anatomic contour and greater esthetics.

Conclusion

The use of zirconia abutments is recommended for anterior regions because of their greater optical properties and esthetic results and more studies should be performed and analyzed longitudinally regarding their biological response.

Clinical significance

The zirconia abutments have been established to be essential in order to achieve great esthetic results in cases of thin peri-implant soft tissues and in regions where the three-dimensional placement of implants is more superficial.

How to cite this article

de Medeiros RA, Vechiato-Filho AJ, Pellizzer EP, Mazaro JVQ, dos Santos DM, Goiato MC. Analysis of the Peri-implant Soft Tissues in Contact with Zirconia Abutments: An Evidence-based Literature Review. J Contemp Dent Pract 2013;14(3):567-572.
Atmospheric processing of iron carried by mineral dust
Authors: Nickovic S. , Vukovic A. , Vujadinovic M.
Published: September 2013

Abstract. Nutrification of the open ocean originates mainly from deposited aerosol in which the bio-avaliable iron is likely to be an important factor. The relatively insoluble iron in dust from arid soils becomes more soluble after atmospheric processing and, through its deposition in the ocean, could contribute to marine primary production. To numerically simulate the atmospheric route of iron from desert sources to sinks in the ocean, we developed a regional atmospheric dust-iron model that included parameterization of the transformation of iron to a soluble form caused by dust mineralogy, cloud processes and solar radiation. When compared with field data on the aerosol iron, which were collected during several Atlantic cruises, the results from the higher-resolution simulation experiments showed that the model was capable of reproducing the major observed patterns.
CARIBIC DOAS observations of nitrous acid and formaldehyde in a large convective cloud
Authors: Heue K.-P. , Riede H. , Walter D. , Brenninkmeijer C. A. M. , Wagner T. , Frieß U. , Platt U. , Zahn A. , Stratmann G. , Ziereis H.
Published: September 2013

Abstract. The CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) flying laboratory measures once per month the chemical composition at cruise altitude (10...12 km) during 4 consecutive Lufthansa flights. Here we present a case study of enhanced nitrogen oxides (NOx), nitrous acid (HONO), and formaldehyde (HCHO) in a thunderstorm cloud over the Caribbean islands of Guadeloupe in August 2011. Nitrous acid is an important reservoir gas for OH radicals, and only few observations of HONO at cruise altitude exist. CARIBIC is designed as a long period atmospheric observation system, the actual system has been flying almost monthly since 8 yr now. During this period only very few similar events (one since 2008) were observed. Due to multiple scattering the light path inside clouds is enhanced, thereby lowering the detection limit of the DOAS instrument. Under background conditions the detection limits are 46 ppt for HONO, 387 ppt for \\chem{HCHO}, and 100 ppt for NO2 and are roughly three times lower inside the cloud. Based on radiative transfer simulations we estimate the path length to 90{\\ldots}100 km and the cloud top height to ≈15 km. The inferred mixing ratios of HONO, HCHO and NO2 are 37 ppt, 400 ppt and 170 ppt, respectively. Bromine monoxide (BrO) remained below the detection limit of 1 ppt. Because the uplifted air masses originated from the remote marine boundary layer and lightning was observed in the area by the World Wide Lightning Location Network several hours prior to the measurement, the NO (≈1.5 ppb) enhancement was in all likelihood caused by lightning. The main source for the observed HCHO is probably updraught from the boundary layer, because the chemical formation of formaldehyde due to methane oxidation is too weak. Besides HCHO also CH3OOH and isoprene are considered as precursors. The chemical box model CAABA is used to estimate the \\chem{NO} and HCHO source strengths, which are necessary to explain our measurements. For NO a source strength of 8.25 × 109 molec cm−2 s−1 km−1 is found, which corresponds to the lightning activity as observed by the World Wide Lightning Location network and a lightning emission of 4.2 × 1025 NO molec/flash. The HCHO updraught is of the order of 121 × 109 molec cm−2 s−1 km−1. Also isoprene and CH3OOH as possible HCHO sources were studied and similar source strengths were found.
Airborne sun photometer PLASMA: concept, measurements, comparison of aerosol extinction vertical profile with lidar
Authors: Karol Y. , Tanré D. , Goloub P. , Vervaerde C. , Balois J. Y. , Blarel L. , Podvin T. , Mortier A. , Chaikovsky A.
Published: September 2013

Abstract. A 15-channel airborne sun-tracking photometer has been developed. The instrument provides aerosol optical depths over a wide spectral range (0.34–2.25 μm) with an accuracy (ΔAOD) of approximately 0.01. Taking measurements at different altitudes allow us to derive the aerosol extinction vertical profile. Thanks to the wide spectral range of the instrument, information on the aerosol size distribution along the vertical is also available.
Can we determine what controls the spatio-temporal distribution of d-excess and 17O-excess in precipitation using the LMDZ general circulation model?
Authors: Risi C. , Landais A. , Winkler R. , Vimeux F.
Published: September 2013

Abstract. Combined measurements of the H218O and HDO isotopic ratios in precipitation, leading to second-order parameter D-excess, have provided additional constraints on past climates compared to the H218O isotopic ratio alone. More recently, measurements of H217O have led to another second-order parameter: 17O-excess. Recent studies suggest that 17O-excess in polar ice may provide information on evaporative conditions at the moisture source. However, the processes controlling the spatio-temporal distribution of 17O-excess are still far from being fully understood. We use the isotopic general circulation model (GCM) LMDZ to better understand what controls d-excess and 17O-excess in precipitation at present-day (PD) and during the last glacial maximum (LGM). The simulation of D-excess and 17O-excess is evaluated against measurements in meteoric water, water vapor and polar ice cores. A set of sensitivity tests and diagnostics are used to quantify the relative effects of evaporative conditions (sea surface temperature and relative humidity), Rayleigh distillation, mixing between vapors from different origins, precipitation re-evaporation and supersaturation during condensation at low temperature. In LMDZ, simulations suggest that in the tropics convective processes and rain re-evaporation are important controls on precipitation D-excess and 17O-excess. In higher latitudes, the effect of distillation, mixing between vapors from different origins and supersaturation are the most important controls. For example, the lower d-excess and 17O-excess at LGM simulated at LGM are mainly due to the supersaturation effect. The effect of supersaturation is however very sensitive to a parameter whose tuning would require more measurements and laboratory experiments. Evaporative conditions had previously been suggested to be key controlling factors of d-excess and 17O-excess, but LMDZ underestimates their role. More generally, some shortcomings in the simulation of 17O-excess by LMDZ suggest that general circulation models are not yet the perfect tool to quantify with confidence all processes controlling 17O-excess.