3,073,118 research outputs found
Application and Use of Multivariate Control Charts In a BTA Deep Hole Drilling Process
No full textDeep hole drilling methods are used for producing holes with a high length-to-diameter ratio, good surface finish and straightness. The process is subject to dynamic disturbances usually classified as either chatter vibration or spiralling. In this paper, we will focus on the application and use of multivariate control charts to monitor the process in order to detect chatter vibrations. The results showed that chatter is detected and some alarm signals occurs at time points which can be connected to physical changes of the process. --
Three Siphonostomatoid Copepods (Dirivultidae) from a Deep-sea Hydrothermal Vent Field in the Central Indian Ridge
No full textThree species of copepods belonging to the family Dirivultidae (Siphonostomatoida) are collected from a deep sea hydrothermal vent field on the Central Indian Ridge in the Indian Ocean during the conduct the deep sea research cruse (July 28 – August 16 2017) by R/V ISABU of Korea Institute of Ocean Science and Technology (KIOST), and reported. They consist of Aphotopontius limulatus Humes previously known from vent fields in the East Pacific and two new species, as follows: Aphotopontius n. sp. and Stygiopontius n. sp. Aphotopontius n. sp. is characterized by the presence of the inner coxal seta in the first to third legs, not in the fourth leg, 2.86 times as long as wide of the caudal ramus in the female, and the lateral margin with an angular apex in the genital double-somite. Stygiopontius n. sp. is easily distinguishable from the congeners by the possessing the only three setae on the inner lobe in the maxillule, and a large tubercle on the first endopodal segment and two spinules-tipped distal spines on the second endopodal segment in the antenna. This is the first record on copepods living in vent fields of the Indian Ocean. – August 16 2017) by R/V ISABU of Korea Institute of Ocean Science and Technology (KIOST), and reported. They consist of Aphotopontius limulatus Humes previously known from vent fields in the East Pacific and two new species, as follows: Aphotopontius n. sp. and Stygiopontius n. sp. Aphotopontius n. sp. is characterized by the presence of the inner coxal seta in the first to third legs, not in the fourth leg, 2.86 times as long as wide of the caudal ramus in the female, and the lateral margin with an angular apex in the genital double-somite. Stygiopontius n. sp. is easily distinguishable from the congeners by the possessing the only three setae on the inner lobe in the maxillule, and a large tubercle on the first endopodal segment and two spinules-tipped distal spines on the second endopodal segment in the antenna. This is the first record on copepods living in vent fields of the Indian Ocean.1
Three Siphonostomatoid Copepods (Dirivultidae) from a Deep-sea Hydrothermal Vent Field in the Central Indian Ridge
No full textThree species of copepods belonging to the family Dirivultidae (Siphonostomatoida) are collected from a deep sea hydrothermal vent field on the Central Indian Ridge in the Indian Ocean during the conduct the deep sea research cruse (July 28 – August 16 2017) by R/V ISABU of Korea Institute of Ocean Science and Technology (KIOST), and reported. They consist of Aphotopontius limulatus Humes previously known from vent fields in the East Pacific and two new species, as follows: Aphotopontius n. sp. and Stygiopontius n. sp. Aphotopontius n. sp. is characterized by the presence of the inner coxal seta in the first to third legs, not in the fourth leg, 2.86 times as long as wide of the caudal ramus in the female, and the lateral margin with an angular apex in the genital double-somite. Stygiopontius n. sp. is easily distinguishable from the congeners by the possessing the only three setae on the inner lobe in the maxillule, and a large tubercle on the first endopodal segment and two spinules-tipped distal spines on the second endopodal segment in the antenna. This is the first record on copepods living in vent fields of the Indian Ocean. – August 16 2017) by R/V ISABU of Korea Institute of Ocean Science and Technology (KIOST), and reported. They consist of Aphotopontius limulatus Humes previously known from vent fields in the East Pacific and two new species, as follows: Aphotopontius n. sp. and Stygiopontius n. sp. Aphotopontius n. sp. is characterized by the presence of the inner coxal seta in the first to third legs, not in the fourth leg, 2.86 times as long as wide of the caudal ramus in the female, and the lateral margin with an angular apex in the genital double-somite. Stygiopontius n. sp. is easily distinguishable from the congeners by the possessing the only three setae on the inner lobe in the maxillule, and a large tubercle on the first endopodal segment and two spinules-tipped distal spines on the second endopodal segment in the antenna. This is the first record on copepods living in vent fields of the Indian Ocean.1
Abundance of small individuals influences the effectiveness of processing techniques for deep-sea nematodes
No full textNematodes are the most abundant metazoans of deep-sea benthic communities, but knowledge of their distribution is limited relative to larger organisms. Whilst some aspects of nematode processing techniques, such as extraction, have been extensively studied, other key elements have attracted little attention. We compared the effect of (1) mesh size (63, 45, and 32 μm) on estimates of nematode abundance, biomass, and body size, and (2) microscope magnification (50 and 100×) on estimates of nematode abundance at bathyal sites (250-3100 m water depth) on the Challenger Plateau and Chatham Rise, south-west Pacific Ocean. Variation in the effectiveness of these techniques was assessed in relation to nematode body size and environmental parameters (water depth, sediment organic matter content, %silt/clay, and chloroplastic pigments). The 63-μm mesh retained a relatively low proportion of total nematode abundance (mean ±SD = 55 ±9%), but most of nematode biomass (90 ± 4%). The proportion of nematode abundance retained on the 45-μm mesh in surface (0-1 cm) and subsurface (1-5 cm) sediment was significantly correlated (P < 0.01) with %silt/clay (R² = 0.39) and chloroplastic pigments (R² = 0.29), respectively. Variation in median nematode body weight showed similar trends, but relationships between mean nematode body weight and environmental parameters were either relatively weak (subsurface sediment) or not significant (surface sediment). Using a low magnification led to significantly lower (on average by 43%) nematode abundance estimates relative to high magnification (P < 0.001), and the magnitude of this difference was significantly correlated (P < 0.05) with total nematode abundance (R²p = 0.53) and the number of small (≤ 250 μm length) individuals (R²p = 0.05). Our results suggest that organic matter input and sediment characteristics influence the abundance of small nematodes in bathyal communities. The abundance of small individuals can, in turn, influence abundance estimates obtained using different mesh sizes and microscope magnifications
First documented record of a living solemyid bivalve in a pockmark of the Nile Deep-sea Fan (eastern Mediterranean Sea)
No full textA living specimen of a solemyid bivalve was collected at bathyal depths near a pockmark in the Nile Deep-sea Fan (eastern Mediterranean) and is here presented. Both taxonomic and molecular results suggest a Solemya species but due to the small size of the animal and the lack of molecular data for other solemyid species the species cannot be determined. This is the first record of a living solemyid from deep-sea cold seeps in the Mediterranean Basin.FCT - SFRH/ BPD/64154/2009ANR DEEP-OASES - ANRO6BDV005CHEMECO ESF EURODEEPMPG-CNRS-GDRE - DIWOO
'Deep insight' into microarray technology
No full textDeep insight on 'Deep insight' into microarray technology
Toward reliability based serviceability limit state verification of dry deep mixing columns
No full textDesign of ground improvement by dry deep mixing to increase the stiffness of soft soil under embankmentsis critical in many infrastructure projects. To ensure high quality in the constructed embankment, the drydeep mixing columns need to be designed with respect to both ultimate and serviceability limit states.Because of the substantial geotechnical uncertainties that affect this design work, we propose the use ofreliability-based design approaches to ensure sufficient reliability in the column design. This papercontributes to the development of a reliability-based design methodology for the relevant serviceability limitstates of ground improvement by dry deep mixing. A common serviceability limit state for dry deep mixingunder embankments is analysed with respect to affecting geotechnical parameters and their associateduncertainties. Challenges on the way toward a full reliability-based design verification methodology for theserviceability of the ground improvement are also discussed.QC 20220815</p
Slab pull, slab weakening, and their relation to deep intra-slab seismicity
No full textSubduction zone seismicity is highly variable. Great earthquakes occur at few subduction zones around the world, with significant variation in size and frequency of deep events. Interactions between overriding and subducting plates and slab pull strength for individual plates provide a framework for understanding these variations. Previous work suggests an inverse correlation between great earthquake moment release and the degree to which the subducted slab is connected to the surface plate. We find positive correlations between degree of plate- slab attachment and moment release from intermediate and deep earthquakes. This implies that shallow slab weakening that occurs at trenches where compressive stresses ( and great earthquakes) dominate not only detaches slabs from plates, but is maintained as the slab descends, discouraging deep seismicity. Regions of low shallow moment release are consistent with extensional shallow stress regimes and undamaged slabs. Such slabs maintain mechanical strength during descent and deform seismogenically at depth
The Mechanisms of Deep Earthquakes
No full textThis dissertation uses a variety of seismological and mathematical tools to investigate the mechanisms
of deep earthquakes, the properties of fault planes and rupture at high pressure within the Earth,
and the local conditions where deep earthquakes occur. This work is split into two parts, focusing
respectively on the properties and conditions of deep faulting
Data envelopment analysis of clinics with sparse data: fuzzy clustering approach
No full textThis paper presents a method for utilizing Data Envelopment Analysis (DEA) with sparse input and output data using fuzzy clustering concepts. DEA, a methodology to assess relative technical efficiency of production units is susceptible to missing data, thus, creating a need to supplement sparse data in a reliable and accurate manner. The approach presented is based on a modified fuzzy c-means clustering using Optimal Completion Strategy (OCS) algorithm. This particular algorithm is sensitive to the initial values chosen to substitute missing values and also to the selected number of clusters. Therefore, this paper proposes an approach to estimate the missing values using the OCS algorithm, while considering the issue of initial values and cluster size. This approach is demonstrated on a real and complete dataset of 22 rural clinics in the State of Kansas, assuming varying levels of missing data. Results show the effect of the clustering based approach on the data recovered considering the amount and type of missing data. Moreover, the paper shows the effect that the recovered data has on the DEA scores
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