scholarly journals Detecting radiolaria in the field

1991 ◽  
Vol 10 (1) ◽  
pp. 22-22 ◽  
Author(s):  
Simon K. Haslett ◽  
Paul D. Robinson
Keyword(s):  
Rock Type ◽  
Fine Fraction ◽  
Field Work ◽  
Coarse Mesh ◽  
Extraction Techniques ◽  
The Past ◽  
Fine Mesh ◽  
Rock Types ◽  
Siliceous Rock ◽  
Calcareous Microfossils

Abstract. Radiolaria can be preserved in all types of marine sedimentary rocks, the method for their extraction being dependent on the mineralogy of the radiolarian test and the nature of the rock-type in which they occur. In the past radiolaria could only be viewed in thin section (Hinde, 1890; Hinde & Fox, 1895), with no method of detecting the presence of radiolaria prior to sectioning. Modern extraction techniques are normally laboratory based and use hazardous chemicals, therefore it is advantageous to establish the radiolarian content of the sample before collection and transportation back to the laboratory. This can be achieved in a number of ways:-1. Non-lithified sediments. Radiolaria are separated from the sediment by washing the sample over a set of small sieves. Two mesh sizes should be used, a coarse mesh around 150μm to separate large litho-fragments, and a fine mesh no greater than 63μm to concentrate the radiolaria. The fine fraction is then washed with dilute hydrochloric acid (HCl) to eliminate the calcareous microfossils, leaving a pure radiolarian sludge, which is dried on filter paper.2. Siliceous rock-types. Methods for extracting radiolaria from cherts have been in use since the early 1970’s (Dumitrica, 1970; Pessagno & Newport, 1972), and have recently been applied to field-work (Cordey & Krauss, 1990). The recognition of fossiliferous bedded cherts is possible with the use of a hand-lens in good sunlight. If radiolaria are present, they should be detectable as small protrusions, especially along laminae. To extract the radiolaria, break up the sample. . .

The Evolution of Lead Extraction

2009 ◽  
Vol 5 (1) ◽  
pp. 32
Author(s):  
Melanie Maytin ◽  
Laurence M Epstein ◽  
◽  
Keyword(s):  
Natural Selection ◽  
Lead Extraction ◽  
Significant Morbidity ◽  
Extraction Techniques ◽  
Extraction Technology ◽  
Device Management ◽  
Future Developments ◽  
The Past ◽  
New Methods ◽  
Life Threatening

Prior to the introduction of successful intravascular countertraction techniques, options for lead extraction were limited and dedicated tools were non-existent. The significant morbidity and mortality associated with these early extraction techniques limited their application to life-threatening situations such as infection and sepsis. The past 30 years have witnessed significant advances in lead extraction technology, resulting in safer and more efficacious techniques and tools. This evolution occurred out of necessity, similar to the pressure of natural selection weeding out the ineffective and highly morbid techniques while fostering the development of safe, successful and more simple methods. Future developments in lead extraction are likely to focus on new tools that will allow us to provide comprehensive device management and the design of new leads conceived to facilitate future extraction. With the development of these new methods and novel tools, the technique of lead extraction will continue to require operators that are well versed in several methods of extraction. Garnering new skills while remembering the lessons of the past will enable extraction technologies to advance without repeating previous mistakes.

Herramientas digitales para recolección, procesamiento y presentación de datos de campo como instrumento para afrontar la contingencia COVID-19

2021 ◽  
Vol 5 ◽  
pp. 96-104
Author(s):  
Didier Haid Alvarado Acosta
Keyword(s):  
Learning Curve ◽  
Training Programs ◽  
Communication Technologies ◽  
Field Work ◽  
Web Based ◽  
Face To Face ◽  
The Past ◽  
Online Platforms ◽  
Virtual Libraries ◽  
Different Types

In March of 2020, the COVID-19 outbreak forced people to lock themselves inside their homes and begin the process of transitioning from face-to-face activities at work, schools and universities to a 100 % virtual method. Even when Communication Technologies (ICT) and online platforms have seen growth over the past two decades, including various virtual libraries developed by database publishers or web-based training programs that appear to shorten the learning curve (Lee, Hong y Nian, 2002), many people were unprepared for this transition and all of them are now dedicated to entering the new reality. In this order of ideas, the activities that have traditionally required the assistance of the staff have had to adapt with the use of new tools, which meet daily needs. A clear example is the field work collection tasks. In this group, there are different types such as surveys, photographs, reviews or on-site inspections. The current work presents the use of tools for collecting, validating, analysing and presenting data remotely and in real time. All of them based on the ArcGIS Online platform.

Enhanced and Rock Typing-Based Reservoir Characterization of the Palaeocene Harash Carbonate Reservoir-Zelten Field-Sirte Basin-Libya

2021 ◽  
Author(s):  
Mohamed Masoud ◽  
W. Scott Meddaugh ◽  
Masoud Eljaroshi ◽  
Khaled Elghanduri
Keyword(s):  
Rock Type ◽  
Carbonate Reservoir ◽  
Classification Model ◽  
Reservoir Rocks ◽  
The Core ◽  
Core Samples ◽  
Rock Types ◽  
Rock Typing ◽  
Open Hole ◽  
Type Classification

Abstract The Harash Formation was previously known as the Ruaga A and is considered to be one of the most productive reservoirs in the Zelten field in terms of reservoir quality, areal extent, and hydrocarbon quantity. To date, nearly 70 wells were drilled targeting the Harash reservoir. A few wells initially naturally produced but most had to be stimulated which reflected the field drilling and development plan. The Harash reservoir rock typing identification was essential in understanding the reservoir geology implementation of reservoir development drilling program, the construction of representative reservoir models, hydrocarbons volumetric calculations, and historical pressure-production matching in the flow modelling processes. The objectives of this study are to predict the permeability at un-cored wells and unsampled locations, to classify the reservoir rocks into main rock typing, and to build robust reservoir properties models in which static petrophysical properties and fluid properties are assigned for identified rock type and assessed the existed vertical and lateral heterogeneity within the Palaeocene Harash carbonate reservoir. Initially, an objective-based workflow was developed by generating a training dataset from open hole logs and core samples which were conventionally and specially analyzed of six wells. The developed dataset was used to predict permeability at cored wells through a K-mod model that applies Neural Network Analysis (NNA) and Declustring (DC) algorithms to generate representative permeability and electro-facies. Equal statistical weights were given to log responses without analytical supervision taking into account the significant log response variations. The core data was grouped on petrophysical basis to compute pore throat size aiming at deriving and enlarging the interpretation process from the core to log domain using Indexation and Probabilities of Self-Organized Maps (IPSOM) classification model to develop a reliable representation of rock type classification at the well scale. Permeability and rock typing derived from the open-hole logs and core samples analysis are the main K-mod and IPSOM classification model outputs. The results were propagated to more than 70 un-cored wells. Rock typing techniques were also conducted to classify the Harash reservoir rocks in a consistent manner. Depositional rock typing using a stratigraphic modified Lorenz plot and electro-facies suggest three different rock types that are probably linked to three flow zones. The defined rock types are dominated by specifc reservoir parameters. Electro-facies enables subdivision of the formation into petrophysical groups in which properties were assigned to and were characterized by dynamic behavior and the rock-fluid interaction. Capillary pressure and relative permeability data proved the complexity in rock capillarity. Subsequently, Swc is really rock typing dependent. The use of a consistent representative petrophysical rock type classification led to a significant improvement of geological and flow models.

Description of a new species of Bush frog (Anura: Rhacophoridae: Raorchestes) from northwestern Yunnan, China

Zootaxa ◽  
2021 ◽  
Vol 4941 (2) ◽  
pp. 239-258
Author(s):  
YUN-HE WU ◽  
XIAO-LONG LIU ◽  
WEI GAO ◽  
YU-FAN WANG ◽  
YING-CHUN LI ◽  
...  
Keyword(s):  
New Species ◽  
Southern China ◽  
Field Work ◽  
The Body ◽  
Adult Males ◽  
The Past ◽  
Black Region ◽  
One New Species ◽  
A New Species ◽  
Northwestern Yunnan

Approximately half of the species in speciose genus Raorchestes were described during the past 10 years, yet only 11 species are known from Southeast Asia and southern China (SEA-SC), adjacent Himalayas, and northeastern India. Field work in northwestern Yunnan province, China resulted in the discovery of one new species in the genus based on morphological and molecular analyses. The new species is diagnosed by small size with 15.0–19.0 mm SVL in adult males (n=3); tongue pyriform, notched posteriorly; rudimentary webbing between toes; fingers and toes with narrow lateral dermal fringes; tibiotarsal articulation reaching anterior of the eye when hindlimb is stretched along the side of the body; relative finger lengths: I < II < IV < III, relative toe lengths: I < II < V < III < IV; inner metatarsal tubercle oval, outer metatarsal tubercle absent; finger discs and toe discs greyish or orange; flank near the crotch with a distinct black region between two creamy white patches, and the thigh having a similar black patch near the groin, proximal to another creamy white patch; a distinct “) (”-shaped dark marking on the back; male with external single subgular vocal sac; nuptial pad absent. A phylogenetic tree was reconstructed based on the mitochondrial genes for 16S rRNA and ND1. The results indicated that these individuals form a monophyletic group, and show high genetic divergence to their closest relatives within the genus (uncorrected p-distances > 3.2%) by distance of 16S comparable to the divergence between recognized Raorchestes species. This study further enriches the diversity of rhacophorids, especially in northwestern Yunnan. 

XXV.—Metamorphism in Relation to Structure in the Scottish Highlands

1931 ◽  
Vol 56 (3) ◽  
pp. 621-646 ◽  
Author(s):  
Gertrude Lilian Elles ◽  
Cecil Edgar Tilley
Keyword(s):  
Field Work ◽  
Geological Survey ◽  
Careful Study ◽  
Metamorphic Condition ◽  
Scottish Highlands ◽  
Rock Types ◽  
Long Time ◽  
Metamorphic Zone ◽  
Hand Specimen

The main object of tho present paper is the consideration of the structure of the Central and S.W. Highlands as shown up by the metamorphic condition of the beds. This metamorphic condition has boon studied over the length and breadth of the country, mapped and deduced from very many outcrops in all districts. Sometimes it was possible to superpose the the details respecting the metamorphism upon the 1-inch maps of the Geological Survey, but in many other cases the areas were mapped upon the 6-inch scale. Naturally this work has taken a long time, for it has necessitated the collection of many thousands of specimens, and nearly 3000 rocks have been sliced and examined, since it is not always possible to define the limits of a metamorphic zone with precision by field work alone, and many rock types were encountered that rendered a more careful study advisable than was possible from the mere examination of a hand specimen.

scholarly journals NILAI KEPAHLAWANAN DALAM TANGON TERPILIH SUKU KIMARAGANG DI SABAH

2021 ◽  
Author(s):  
JAMAIL MASADOR ◽  
ABDUL HALIM ALI ◽  
AZHAR WAHID
Keyword(s):  
Field Work ◽  
Self Esteem ◽  
Qualitative Approach ◽  
The Past ◽  
Fighting Spirit ◽  
Interview Methods ◽  
Younger Generation

Tangon (cerita rakyat) sering diperdengarkan dalam masyarakat suku Kimaragang. Pada umumnya, cerita-cerita rakyat (tangon) suku Kimaragang melambangkan sosiobudaya, falsafah dan gambaran nilai kepahlawanan bagi masyarakat tersebut. Namun, dewasa ini, nilai-nilai yang terkandung dalam tangon sering dilupakan, terutama oleh generasi muda. Oleh itu, kajian ini memberi perhatian pada nilai-nilai kepahlawanan yang terkandung dalam cerita rakyat suku Kimaragang di Sabah. Kajian ini menggunakan pendekatan kualitatif yang melibatkan kaedah kajian lapangan dan temu bual untuk mendokumentasi tangon. Seterusnya, data akan dianalisis menggunakan pendekatan Alamiah salah satu pendekatan dalam teori Pengkaedahan Melayu yang dikemukakan oleh Hashim Awang bagi memahami aspek-aspek kepahlawanan seperti keberanian, rela berkorban, semangat juang dan keterbukaan yang terkandung dalam cerita rakyat. Dapatan kajian ini membuktikan bahawa elemen kepahlawanan penting dikuasai, terutama dalam norma masyarakat yang kucar-kacir demi mengangkat martabat diri dan menjaga kehormatan. Sememangnya, masyarakat suku Kimaragang pada masa lampau mengamalkan nilai-nilai kepahlawanan dalam kehidupan untuk memastikan sebuah kehidupan yang aman dan sejahtera. Mengaplikasi nilai-nilai kepahlawanan dalam kehidupan masa kini merupakan suatu daripada usaha untuk mengupaya dan mengekalkan warisan yang semakin dilupakan. The telling of ‘tangon’ (folklore) is a common practice in the Kimaragang community. In general, the ‘tangon’ of the Kimaragang symbolises the socio-culture, philosophy and description of the heroism values for the community. However, nowadays, the values in ‘tangon’ are often forgotten, especially by the younger generation. This study thereforefocused on the heroism values as portrayed in the folklore of the Kimaragang. Using a qualitative approach, the field work and interview methods were utilised to document the ‘tangon’. Data was analysed using the Alamiahapproach, one of the approaches in the ’Pengkaedahan Melayu’ theory by Hashim Awang as a means to understand heroism aspects such as bravery, sacrificial spirit, fighting spirit, and openness as embodied in the folklore. The findings of this study prove that the element of heroism is important to master especially in the norms of a chaotic society in order to improve self-esteem and maintain honour. Indeed, the Kimaragang in the past practised heroism values to ensure a peaceful and prosperous life. Applying these values in life today is one of the efforts to activate and sustain an increasingly forgotten heritage.

scholarly journals Petrographic analysis of carbonate rocks for alkali-aggregate reactivity

1970 ◽  
Vol 14 ◽  
pp. 15-20
Author(s):  
Naresh Kazi Tamrakar ◽  
Lalu Prasad Paudel
Keyword(s):  
Rock Sample ◽  
Rock Type ◽  
Significant Proportion ◽  
Carbonaceous Material ◽  
Petrographic Analysis ◽  
Rock Types ◽  
Alkali Silica Reactivity ◽  
Alkali Carbonate ◽  
Alkali Aggregate Reactivity

Quality of aggregate is of extreme concern when it is to be used for infrastructures. Besides, many physical and mechanicalproperties of the aggregate, presence or absence of deleterious constituents and alkali-silica reactivity are especially importantwhen aggregates are to be used in concrete structures. High potential of alkali-silica reactivity or alkali-carbonate reactivity andpresence of deleterious constituents may impair the infrastructures.A ledge rock sample from the heap to be taken for crushing was petrographically analysed for alkali-silica reactivity. Inoverall, two rock clans (dolosparstone and dolomicrosparstone) with three sub clans (rock type X, Y and Z) from the sample 2 areidentified. Rock type X (dolosparstone) constitutes 82.94% of the whole sample, and shows notable amount of quartz and calciteveins, and carbonaceous material and hematite on the mosaic of dolospars. Rock types Y (dolosparstone) and Z (dolomicrosparstone)contain trace amount of microquartz, mega quartz (>15 mm) and carbonaceous opaques. The rock type Z is dominantly composedof dolomicrospars. Major portions of all the rock types are characterised by mosaics of dolomite in association with variableamounts of muscovite, quartz, and calcite. Calcite often replaces the mosaics of dolomite and bands of quartz, forming a veinnetworks in rock types X and Y. Silica is represented by a low-temperature mega quartz either in ground or in veins, a trace amountof microquartz in rock types Y and Z. There is no other reactive silica components, thus showing a low potential to alkali-silicareactivity. However, the sample shows potential of alkali-carbonate reactivity as significant proportion of rock type havingdolomicrospars are found.DOI: http://dx.doi.org/10.3126/bdg.v14i0.5433Bulletin of the Department of Geology Vol.14 2011, pp.15-20

scholarly journals Review of the Survey's activities in 1986

1987 ◽  
Vol 135 ◽  
pp. 5-7
Author(s):  
M Ghisler
Keyword(s):  
Geophysical Methods ◽  
Basic Research ◽  
Field Work ◽  
Systematic Investigation ◽  
Geological Mapping ◽  
40Th Anniversary ◽  
The Past ◽  
Applied Geology ◽  
Geological Background

The Geological Survey of Greenland (GGU) continued in 1986 the systematic investigation of the geology of Greenland. The work comprises geological mapping and basic research as well as applied geology and geophysics (fig. 1). The long term purpose is to establish the necessary geological background for evaluation of the potential of the non-living resources. The scientific and technical staff of 112 based in Copenhagen and 87 participating in the field work in Greenland carried out programmes of geological mapping and investigation, glaciological investigations, and mineral and oil assessments which included geochemical and geophysical methods. In April 1986 GGU celebrated its 40th anniversary. A special publication dedicated to GGU's former director, K. Ellitsgaard-Rasmussen, was issued which covers different aspects of the Survey's work in the developments in Greenland geology over the past ten years.

scholarly journals Insight on the anatomy, systematic relationships, and age of the Early Cretaceous ankylopollexian dinosaur Dakotadon lakotaensis

2015 ◽  
Author(s):  
Clint A Boyd ◽  
Darrin C Pagnac
Keyword(s):  
Early Cretaceous ◽  
Original Description ◽  
Field Work ◽  
Optimality Criteria ◽  
Dorsal Vertebra ◽  
The Past ◽  
Caudal Vertebrae ◽  
Systematic Relationships ◽  
Preparation Work ◽  
Extensive Deformation

Knowledge regarding the early evolution within the dinosaurian clade Ankylopollexia drastically increased over the past two decades, in part because of an increase in described taxa from the Early Cretaceous of North America. These advances motivated the recent completion of extensive preparation and conservation work on the holotype and only known specimen of Dakotadon lakotaensis, a basal ankylopollexian from the Lakota Formation of South Dakota. That specimen (SDSM 8656) preserves a partial skull, lower jaws, a single dorsal vertebra, and two caudal vertebrae. That new preparation work exposed several bones not included in the original description and revealed that other bones were previously misidentified. The presence of extensive deformation in areas of the skull is also noted that influenced inaccuracies in prior descriptions and reconstructions of this taxon. In addition to providing an extensive re-description of D. lakotaensis, this study reviews previously proposed diagnoses for this taxon, identifies two autapomorphies, and provides an extensive differential diagnosis. Dakotadon lakotaensis is distinct from the only other ankylopollexian taxon known from the Lakota Formation, Osmakasaurus depressus, in the presence of two prominent, anteroposteriorly oriented ridges on the ventral surfaces of the caudal vertebrae, the only overlapping material preserved between these taxa. The systematic relationships of D. lakotaensis are evaluated using both the parsimony and posterior probability optimality criteria, with both sets of analyses recovering D. lakotaensis as a non-hadrosauriform ankylopollexian that is more closely related to taxa from the Early Cretaceous (e.g., Iguanacolossus, Hippodraco, and Theiophytalia) than to more basally situated taxa from the Jurassic (e.g., Camptosaurus, Uteodon). This taxonomic work is supplemented by field work that relocated the type locality, confirming its provenance from unit L2 (lower Fuson Member equivalent) of the Lakota Formation. Those data, combined with recently revised ages for the members of the Lakota Formation based on charophyte and ostracod biostratigraphy, constrain the age of this taxon to the late Valanginian to early Barremian.

scholarly journals Reigning with Christ for a Thousand Years: Two Prophets of Russian Millennialism

2020 ◽  
Vol 38 (3) ◽  
pp. 149-177
Author(s):  
Sergey Petrov ◽  
Keyword(s):  
Field Work ◽  
Old Russian ◽  
The Past ◽  
The Usa ◽  
Historical Accounts ◽  
Practical Sense

The article explores the crossroads of two surviving groups of “old Russian sectarianism” — Molokan Jumpers and JehovistsIl’intsy — for whom the anticipation of the millennial kingdom on earth was a central doctrinal tenet. Researchers in the past, as well as modern scholars of religion, usually have not paid attention to the connection between the two movements, which was at one time quite substantial both in the doctrinal and the practical sense. Handwritten, typed and unofficially published sources gathered by the author during field work served as the principal material for the article. They include letters of Nikolai Il’in to his followers and his other writings, the memoirs of Molokan elders, and the historical accounts found among the Molokans of Armenia and the USA.

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