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Articles 37471 - 37500 of 302561

Full-Text Articles in Physical Sciences and Mathematics

Updated Analysis Of An Unexpected Correlation Between Dark Matter And Galactic Ellipticity, D. M. Winters, Alexandre Deur, X. Zheng Jan 2022

Updated Analysis Of An Unexpected Correlation Between Dark Matter And Galactic Ellipticity, D. M. Winters, Alexandre Deur, X. Zheng

Physics Faculty Publications

We investigate a correlation between the dark matter content of elliptical galaxies and their ellipticity ϵ that was initially reported in 2014. We use new determinations of dark matter and ellipticities that are posterior to that time. Our data set consists of 237 elliptical galaxies passing a strict set of criteria that selects a homogeneous sample of typical elliptical galaxies. We find a relation between the mass-to-light ratio and ellipticity ϵ that is well fitted by M/L = (14.1 ± 5.4)ϵ, which agrees with the result reported in 2014. Our analysis includes 135 galaxies that were not in …

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Numerical Testcases To Study Proudman Resonance Using Shallow Water Models, Nicole Beisiegel, Jorn Behrens Jan 2022

Numerical Testcases To Study Proudman Resonance Using Shallow Water Models, Nicole Beisiegel, Jorn Behrens

Conference papers

Proudman resonance is the dominant mechanism behind meteotsunamis. We develop a comprehensive set of testcases to validate numerical methods focusing on the performance with respect to represent mentioned resonance. With the test cases we assess the wave amplification in dependence of characteristics of the pressure perturbation, model parameters, model resolution, and bathymetry characteristics. We use the compilation of tests to validate an adaptive discontinuous Galerkin (DG) model for the two-dimensional non-linear shallow water equations. As the tests are highly sensitive to model resolution, we use the adaptive mesh capabilities of the model to locally refine the disturbance and thus gain …

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Determination Of Recent Tectonic Deformations Along The Tuz Gölü Fault Zone In Centralanatolia (Turkey) With Gnss Observations, Cemi̇l Gezgi̇n, Semi̇h Ekerci̇n, İbrahi̇m Ti̇ryaki̇oğlu, Bahadir Aktuğ, Hedi̇ye Erdoğan, Esra Gürbüz, Osman Orhan, Süleyman Sefa Bi̇lgi̇li̇oğlu, Ahmet Tarik Torun, Hali̇l İbrahi̇m Gündüz, Osman Oktar, Cezmi̇ Türkmen, Efdal Kaya Jan 2022

Determination Of Recent Tectonic Deformations Along The Tuz Gölü Fault Zone In Centralanatolia (Turkey) With Gnss Observations, Cemi̇l Gezgi̇n, Semi̇h Ekerci̇n, İbrahi̇m Ti̇ryaki̇oğlu, Bahadir Aktuğ, Hedi̇ye Erdoğan, Esra Gürbüz, Osman Orhan, Süleyman Sefa Bi̇lgi̇li̇oğlu, Ahmet Tarik Torun, Hali̇l İbrahi̇m Gündüz, Osman Oktar, Cezmi̇ Türkmen, Efdal Kaya

Turkish Journal of Earth Sciences

The Tuz Gölü Fault Zone (TGFZ) is one of the most important active tectonic structures of Central Anatolia. The morphotectonic features of the TGFZ and the distribution of the epicenters of earthquakes over magnitude 5.0 show that this fault zone remains active today. In this study, the deformation of the TGFZ is determined with high sensitivity using geodetic measurements. To obtain accurate information about the deformation of the TGFZ, 24 GNSS sites and two continuously operating reference stations were constructed in the southern part of the TGFZ. Between 2018 and 2020, Global Navigation Satellite Systems (GNSS) measurements were made on …

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Mineralogical And Paleobotanical Investigations Of Oligo-Miocene Petrified Wood Fromthe Southwest Of Thrace Basin (Nw Turkey), Burcu Üner, Sabah Yilmaz Şahi̇n, Ünal Akkemi̇k Jan 2022

Mineralogical And Paleobotanical Investigations Of Oligo-Miocene Petrified Wood Fromthe Southwest Of Thrace Basin (Nw Turkey), Burcu Üner, Sabah Yilmaz Şahi̇n, Ünal Akkemi̇k

Turkish Journal of Earth Sciences

Petrified wood samples are found within terrestrial sediments belonging to the Late Oligocene-Early Miocene Danişmen Formation in Malkara-Keşan located in the southwest of the Thrace Basin. The petrified wood in both regions is usually silicified and partly coalified. The silicification of the Tertiary wood in the Malkara-Keşan region is associated with volcanic activity and coeval sedimentation. Thin sections from petrified wood samples were taken as transverse, tangential, and radial sections. The mineralogicalpetrographic- botanical studies were carried out under a polarizing and botanical microscope. Opal-moganite-chalcedony-quartz, which are different polymorphs of silica, were detected under the microscope in the petrified wood. Results …

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No Sand Shipment For Cleopatra By Antonius: Resedimentary Origin For The Ooidal Sand Beach Of Sedir Island (Aegean Coast Of Sw Anatolia), Mehmet Ci̇hat Alçi̇çek Jan 2022

No Sand Shipment For Cleopatra By Antonius: Resedimentary Origin For The Ooidal Sand Beach Of Sedir Island (Aegean Coast Of Sw Anatolia), Mehmet Ci̇hat Alçi̇çek

Turkish Journal of Earth Sciences

No abstract provided.

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The Provenance Of Coarse-Grained Turbidite Sandstones In The Kırkgeçit Formation(Western Part Of The Elazığ Basin-East Turkey), Onur Alkaç, Ercan Aksoy Jan 2022

The Provenance Of Coarse-Grained Turbidite Sandstones In The Kırkgeçit Formation(Western Part Of The Elazığ Basin-East Turkey), Onur Alkaç, Ercan Aksoy

Turkish Journal of Earth Sciences

Modal analysis of sandstones for conglomerate rich marine basins is useful for investigating the provenance types surrounded by plate tectonics. Different kinds of siliciclastic rocks are important indicators for defining the paleogeography and geotectonic conditions of the sedimentary basin by provenance analysis. This paper, which focuses on the petrography and provenance of conglomerate rich turbidite systems, is one of the rarest studies on the sedimentary characteristics in the scientific literature. In this context, the study was carried out in the western part of the Elazığ Basin. The Middle Eocene?Oligocene basin infill called the Kırkgeçit Formation is characterised by the conglomerate …

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Hydrochemical Characteristics And Geothermometry Applications Of Thermal Waters Inthe Çürüksu Graben, Western Turkey, Ali̇ Gökgöz, Hali̇m Mutlu, Mehmet Ali̇ Akman Jan 2022

Hydrochemical Characteristics And Geothermometry Applications Of Thermal Waters Inthe Çürüksu Graben, Western Turkey, Ali̇ Gökgöz, Hali̇m Mutlu, Mehmet Ali̇ Akman

Turkish Journal of Earth Sciences

In this study, we investigate chemical and isotopic characteristics of low-temperature geothermal waters issuing from carbonate reservoirs in the Çürüksu Graben within the eastern termination of the Büyük Menderes Graben in western Turkey. Temperatures and pH values of geothermal waters vary from 20.1 to 24.6 °C and 6.62 to 7.11 and those of cold waters are 17.1 to 19.9 °C and 6.85 to 7.72, respectively. Geothermal waters are of Ca-HCO3 and Ca-SO4 types whereas cold waters are characterized by these two types and Mg-HCO3 as well. δ18O and δD values of samples vary from ?9.27‰ to -7.69‰ (VSMOW) and -58.06‰ …

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Wide-Area Ground Deformation Monitoring In Geothermal Fields In Western Turkey, Gökhan Aslan, Hakki Aydin, Zi̇yadi̇n Çakir Jan 2022

Wide-Area Ground Deformation Monitoring In Geothermal Fields In Western Turkey, Gökhan Aslan, Hakki Aydin, Zi̇yadi̇n Çakir

Turkish Journal of Earth Sciences

The large-scale production and injection of geothermal fluids induce pressure, volume, and temperature gradient changes in the subsurface, which may result in surface deformation as well. Interferometric synthetic aperture radar (InSAR) is a promising utility for monitoring ground surface deformation and inferring subsurface reservoir operations that are difficult to observe directly. This study provides the first wide-area InSAR-derived long-term ground deformation across major geothermal fields in western Turkey. It aims to identify ground deformation hotspots within the geothermal exploitation sites and analyze their relationship with energy production and pumping. In the present study, the whole 2014?2020 Sentinel 1-A and 1-B …

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Reducing Uncertainty With Fault Seal Analysis: A Case Study Of Jherruck Block, Lowerindus Basin, Pakistan, Mudassar Nawaz, Muhammad Rustam Khan, Umair Bin Nisar, Muhammad Rizwan Mughal Jan 2022

Reducing Uncertainty With Fault Seal Analysis: A Case Study Of Jherruck Block, Lowerindus Basin, Pakistan, Mudassar Nawaz, Muhammad Rustam Khan, Umair Bin Nisar, Muhammad Rizwan Mughal

Turkish Journal of Earth Sciences

Faults can be either conduits or baffles for hydrocarbon flow. Assessing the sealing potential of faults plays a vital role in reducing the risks associated with hydrocarbon exploration. The study area is located in Jherruck Block, Lower Indus Basin, Pakistan. Several intervals within the Lower Goru Formation in Lower Indus Basin are proven hydrocarbon reservoirs. The main aim of the study is to predict the cause of failure of 3 wells (Jherruck B-1, Jamali-1, and Jamali Deep-1), and to propose a new well location based on juxtaposition analysis and shale gouge ratio (SGR). The Upper Sands (sandstone) of the Lower …

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Walkaway Vertical Seismic Profiling (Wvsp) Modeling And Imaging Study Along Faultedcoal Seams Over A High Velocity Limestone Model: A Synthetic Study, Cemal Erdemi̇r Jan 2022

Walkaway Vertical Seismic Profiling (Wvsp) Modeling And Imaging Study Along Faultedcoal Seams Over A High Velocity Limestone Model: A Synthetic Study, Cemal Erdemi̇r

Turkish Journal of Earth Sciences

The problem of collecting reflection data from the layers below a high velocity layer (HVL) and imaging those layers accurately is solved using walkaway vertical seismic profiling (WVSP) technique. The procedure is shown on a dataset from a model of highly faulted, thin-bedded coal layers separated by a high velocity layer of limestone. By locating the receivers above, in, and below the HVL, the reflections are expected to be recorded locally in situ in the borehole below the HVL before they travel back to the surface as in the case of surface seismic. The imaging results obtained from the model …

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Updated Geochemical And Geothermometry Study On Ömer-Gecek Geothermal Area (Afyonkarahisar/Turkey), Can Başaran, Yusuf Ulutürk, Ahmet Yildiz Jan 2022

Updated Geochemical And Geothermometry Study On Ömer-Gecek Geothermal Area (Afyonkarahisar/Turkey), Can Başaran, Yusuf Ulutürk, Ahmet Yildiz

Turkish Journal of Earth Sciences

The Ömer-Gecek region, one of the most critical geothermal areas of Afyonkarahisar, together with Western Anatolia, serves as a model for the integrated use of geothermal waters. As a result of the analysis made on the samples collected from the newly drilled wells, the chemical composition of the Ömer-Gecek geothermal waters, with a max temperature of 125 °C, has been determined as Na-Cl. The primary hydrochemical process affecting the chemical composition is silicate weathering. All the applied geothermometer methods showed that the water's maximum reservoir temperature was 120-130 °C. The calcite, dolomite, and aragonite minerals tend to precipitate. When compared …

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Detrital Composition Of Triassic To Neogene Sandstones In The Sulaiman Fold-Thrust Belt, Pakistan: Implications For Pre- And Postcollisional Evolution Of The Northwestern Indian Margin, Shazia Fareed, Akhtar Kassi, Aimal Kasi, Namik Aysal Jan 2022

Detrital Composition Of Triassic To Neogene Sandstones In The Sulaiman Fold-Thrust Belt, Pakistan: Implications For Pre- And Postcollisional Evolution Of The Northwestern Indian Margin, Shazia Fareed, Akhtar Kassi, Aimal Kasi, Namik Aysal

Turkish Journal of Earth Sciences

Sandstones of the Triassic through Pliocene successions of the western Sulaiman Fold-Thrust Belt (SFTB), Pakistan, were studied, by polarizing microscope and using point-counting techniques, to determine systematic variations in detrital modes. The sandstones in the study area are categorized into pre- and postcollisional sandstone assemblages. The precollisional assemblage was deposited before the onset of collision of India with Eurasia (starting Late Cretaceous-Early Paleocene) and subcategorized as Wulgai- Mughal Kot, Bibai and Pab subassemblages. The postcollisional assemblage was deposited after the onset of collision and categorized as Ghazij and Urak subassemblages. The Wulgai-Mughal Kot subassemblage mostly comprises of highly quartzose sandstones …

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Relative Tectonic Activity Assessment Of Kütahya Graben (Western Anatolia): Insights From Geomorphic Indices, Zeynep Kezer, Erman Özsayin Jan 2022

Relative Tectonic Activity Assessment Of Kütahya Graben (Western Anatolia): Insights From Geomorphic Indices, Zeynep Kezer, Erman Özsayin

Turkish Journal of Earth Sciences

Western Anatolia is known as one of the most seismically active regions in the world, consistent with earthquakes having a magnitude >6.0. The deformation in the region is predominantly controlled by normal faults, which play significant role on the morphological features as well as depositional processes in related grabens. WNW-trending Kütahya Graben is located at the northeastern part of this province and bounded by several N- and S-dipping active normal fault segments. This study aims to investigate the relative tectonic activity among the fault segments of the Kütahya Graben using geomorphic indices. The analyses of this study include mountain-front sinuosity …

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Holocene Sedimentary History Of South Danamandıra Lake: A Peatland In West Of İstanbul, Çatalca Peninsula, Nw Turkey, Özlem Makaroğlu, Melda Küçükdemi̇rci̇, Nurgül Karlioğlu, Dursun Acar, Ali̇ Gürel, Rüya Yilmaz Dağdevi̇ren, Nuretti̇n Yakupoğlu, Asen Sabuncu, Damla Şahi̇n Altun, Mustafa Ömer Karaöz, Memet Namik Çağatay Jan 2022

Holocene Sedimentary History Of South Danamandıra Lake: A Peatland In West Of İstanbul, Çatalca Peninsula, Nw Turkey, Özlem Makaroğlu, Melda Küçükdemi̇rci̇, Nurgül Karlioğlu, Dursun Acar, Ali̇ Gürel, Rüya Yilmaz Dağdevi̇ren, Nuretti̇n Yakupoğlu, Asen Sabuncu, Damla Şahi̇n Altun, Mustafa Ömer Karaöz, Memet Namik Çağatay

Turkish Journal of Earth Sciences

This study investigates the sedimentological evolution of the South Danamandıra Lake (SDL) lake in Çatalca Peninsula, 70 km west of İstanbul, using Georadar data and multiproxy analyses of five sediment cores. The lake is a 1.3-m deep, endorheic freshwater peatland, heavily colonised by common reed (Phragmites sp.). The multiproxy core investigations include a lithological core description and environmental magnetism, physical properties (gamma density and magnetic susceptibility), geochemical elemental, pollen and radiocarbon dating analyses. The lithological sequence in the lake consists of an upper peat unit and a lower sand-silt-clay unit. The peat unit is characterized by lower magnetic susceptibility, density …

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Late Ediacaran Inertial-Interchange True Polar Wander (Iitpw) Event: A New Road To Reconcile The Enigmatic Paleogeography Prior To The Final Assembly Of Gondwana, Bin Wen, Cairong Luo, Yong-Xiang Li, Yanting Lin Jan 2022

Late Ediacaran Inertial-Interchange True Polar Wander (Iitpw) Event: A New Road To Reconcile The Enigmatic Paleogeography Prior To The Final Assembly Of Gondwana, Bin Wen, Cairong Luo, Yong-Xiang Li, Yanting Lin

Turkish Journal of Earth Sciences

The Ediacaran to Early Cambrian plate tectonics was dominated by a full dispersal of the supercontinent Rodinia and the subsequent amalgamation of Gondwana. There is a consensus that the final assembly of Gondwana was not completed until the Early Cambrian. Prior to the final assembly, however, one major uncertainty remains on the quantitative paleogeography: the mainland of Gondwana was plausibly positioned at either a high or low latitude at a single time instant to meet the dual-latitude ('high-latitude' and 'low-latitude') options of Laurentia and the requirement of

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A Preliminary Account On Devonian Trilobites From Arabian Plate, Se Turkey, Catherine Cronier, İzzet Hoşgör Jan 2022

A Preliminary Account On Devonian Trilobites From Arabian Plate, Se Turkey, Catherine Cronier, İzzet Hoşgör

Turkish Journal of Earth Sciences

Recently, several Devonian localities and the related biota occurring from the southeastern Turkey were reinvestigated. Although, the Hakkari-Çukurca and the Diyarbakır-Hazro areas of the Arabian Plate are considered as an important source of the Devonian macrofossils from the north Arabian sector of Gondwana, the existing record of Devonian trilobites in these regions was hitherto unknown. We here report and illustrate for the first time Lower and Middle Devonian trilobites represented by three proetid pygidia and one calymenid pygidium. The morphological features of these pygidia suggest that they can be assigned to undetermined species of Gravicalymene (Calymenidae) and Podoliproetus (Proetidae), two …

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Devonian Parathuramminids From Taurides, Southern Turkey, Recep Özkan Jan 2022

Devonian Parathuramminids From Taurides, Southern Turkey, Recep Özkan

Turkish Journal of Earth Sciences

Devonian shallow marine carbonate rocks of the Taurides (southern Turkey) host rich and diverse faunal assemblages of foraminifera including unilocular organisms of the family Parathuramminidae. This study allowed investigating the calcareous unilocular parathuramminid fauna obtained from three measured stratigraphic sections Halevikdere, Kocadere and Eceli in addition to one detailed, shorter section measured along the Halevikdere section. The investigation revealed that the parathuramminid species, which commonly occur in lagoonal environments, are widely distributed throughout the studied sections. They mostly exist in limestone beds deposited in a time interval from Middle Devonian (Eifelian) to Late Devonian (Frasnian). However, their richness and diversity …

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Tectonomagmatic Reconstruction Of The Upper Mesozoic-Cenozoic Neotethyan Arcs In The Lut Block, East Iran: A Review And Synthesis, Reza Arjmandzadeh, Saeed Alirezaei, Alireza Almasi Jan 2022

Tectonomagmatic Reconstruction Of The Upper Mesozoic-Cenozoic Neotethyan Arcs In The Lut Block, East Iran: A Review And Synthesis, Reza Arjmandzadeh, Saeed Alirezaei, Alireza Almasi

Turkish Journal of Earth Sciences

The Lut Block in east Iran with a widespread record of arc-type Mesozoic-Cenozoic magmatic rocks is bordered by the Birjand (Sistan) ophiolitic assemblage to the east and the Sabzevar ophiolitic assemblage to the north. The nature and tectonomagmatic setting of these sutures and associated arcs are controversial. The geochemical attributes of the Upper Cretaceous-Paleogene intrusive and extrusive rocks in the central (CLB) and the northern Lut block (NLB) and in the Sabzevar ophiolite zone (SOZ), Late Cretaceous calc-alkaline and adakitic rocks to the east of the Sistan suture (CAS), and the Bazman intrusives to the west are consistent with a …

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A Case Study On Geomorphology: Tree-Ring-Based Confirmation Of The Formation Year Of Lake Kaindy After The 1911 Kemin Earthquake In Almaty (Kazakhstan), Ünal Akkemi̇k, Kuralay Mazarzhanova, Arailym Kopabayeva Jan 2022

A Case Study On Geomorphology: Tree-Ring-Based Confirmation Of The Formation Year Of Lake Kaindy After The 1911 Kemin Earthquake In Almaty (Kazakhstan), Ünal Akkemi̇k, Kuralay Mazarzhanova, Arailym Kopabayeva

Turkish Journal of Earth Sciences

Lake Kaindy, which is located in the Kazakhstan side of the Tien Shan Mountains is one of the most famous places in the World due to having sunken Picea schrenkiana Fisch. & C.A.Mey. trees within the Lake. The purpose of the study is to find the dead years of the sunken trees in the lake and therefore to confirm the formation time of Kaindy Lake, and if there is an effect of the 1911 Kemin earthquake on the tree-ring width of Picea schrenkiana around the lake. Eight wood pieces and two increment cores from the sunken trees were taken to …

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Vertical Variations Of Minerals In Clayey Sedimentary Rocks In The Cores Of Two-Deep Exploration Wells From The Kozlu Coalfield (Zonguldak, Nw Türkiye), With Emphasis On Tonstein (Schieferton) Formation, Ali̇ İhsan Karayi̇ği̇t, Emi̇ne Sütcü, Abi̇di̇n Temel, Mustafa Ni̇yazi̇ Gündoğdu Jan 2022

Vertical Variations Of Minerals In Clayey Sedimentary Rocks In The Cores Of Two-Deep Exploration Wells From The Kozlu Coalfield (Zonguldak, Nw Türkiye), With Emphasis On Tonstein (Schieferton) Formation, Ali̇ İhsan Karayi̇ği̇t, Emi̇ne Sütcü, Abi̇di̇n Temel, Mustafa Ni̇yazi̇ Gündoğdu

Turkish Journal of Earth Sciences

The majority of Turkish bituminous coal resources are located in the Zonguldak Basin. The Carboniferous coal seams in the Alacaağzı, Kozlu, and Karadon formations have received interest. However, the detailed mineralogical compositions of clayey sedimentary rocks in coal-bearing sequences in the basin have been limited. This study aims to investigate vertical variations of mineralogical compositions of Carboniferous and Early Cretaceous clayey sedimentary rocks cored in the two-deep exploration wells (K20/K and K20/H) from the Kozlu coalfield using XRD and SEM-EDX analyses data. In addition, a special interest is also given to tonstein layers identified within the Kozlu and Karadon formations. …

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Non-Parametric Stochastic Autoencoder Model For Anomaly Detection, Raphael B. Alampay, Patricia Angela R. Abu Jan 2022

Non-Parametric Stochastic Autoencoder Model For Anomaly Detection, Raphael B. Alampay, Patricia Angela R. Abu

Department of Information Systems & Computer Science Faculty Publications

Anomaly detection is a widely studied field in computer science with applications ranging from intrusion detection, fraud detection, medical diagnosis and quality assurance in manufacturing. The underlying premise is that an anomaly is an observation that does not conform to what is considered to be normal. This study addresses two major problems in the field. First, anomalies are defined in a local context, that is, being able to give quantitative measures as to how anomalies are categorized within its own problem domain and cannot be generalized to other domains. Commonly, anomalies are measured according to statistical probabilities relative to the …

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Simulation Of Urban Heat Island During A High-Heat Event Using Wrf Urban Canopy Models: A Case Study For Metro Manila, Ronald Gil Joy P. Bilang, Ariel C. Blanco, Justine Ace S. Santos, Lyndon Mark P. Olaguera Jan 2022

Simulation Of Urban Heat Island During A High-Heat Event Using Wrf Urban Canopy Models: A Case Study For Metro Manila, Ronald Gil Joy P. Bilang, Ariel C. Blanco, Justine Ace S. Santos, Lyndon Mark P. Olaguera

Physics Faculty Publications

This present study aims to determine the performance of using the Weather Research and Forecasting (WRF) Model, coupled with the urban canopy models (UCMs), in simulating the 2 m air temperature and 2 m relative humidity in Metro Manila. The simulation was performed during a high heat event on 22–29 April 2018, which coincided with the dry season in the Philippines. The four urban canopy model options that were used in this study include, the bulk (no urban), SLUCM, BEP, and BEM. The results of the simulations were compared with the hourly observations from three weather stations over Metro Manila …

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Stubborn Aerosol: Why Particulate Mass Concentrations Do Not Drop During The Wet Season In Metro Manila, Philippines, Miguel Ricardo A. Hilario, Paola Angela Bañaga, Grace Betito, Rachel A. Braun, Maria Obiminda L. Cambaliza, Melliza Templonuevo Cruz, Genevieve Rose Lorenzo, Alexander B. Macdonald, Preciosa Corazon Pabroa, James Bernard Simpas Jan 2022

Stubborn Aerosol: Why Particulate Mass Concentrations Do Not Drop During The Wet Season In Metro Manila, Philippines, Miguel Ricardo A. Hilario, Paola Angela Bañaga, Grace Betito, Rachel A. Braun, Maria Obiminda L. Cambaliza, Melliza Templonuevo Cruz, Genevieve Rose Lorenzo, Alexander B. Macdonald, Preciosa Corazon Pabroa, James Bernard Simpas

SOSE Affiliate: Manila Observatory

Wet scavenging is the most important sink for particulate matter (PM) and is expected to decrease PM concentrations in the wet season. However, Metro Manila, Philippines has highly similar PM mass across seasons despite large differences in seasonal rainfall. It is important to identify factors contributing to seasonally consistent PM mass as these may be present in similar developing megacities besides Metro Manila, leading to PM accumulation and posing significant health risks. We use size-resolved aerosol composition, aerosol optical depth, and meteorological data to reveal that the seasonally consistent PM mass in Metro Manila is due to (1) opposing seasonal …

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Greater Loss And Fragmentation Of Savannas Than Forests Over The Last Three Decades In Yunnan Province, China, R Sedricke Lapuz, Angelica Kristina M. Jaojoco, Sheryl Rose C. Reyes, Jose Don T. De Alban, Kyle W. Tomlinson Jan 2022

Greater Loss And Fragmentation Of Savannas Than Forests Over The Last Three Decades In Yunnan Province, China, R Sedricke Lapuz, Angelica Kristina M. Jaojoco, Sheryl Rose C. Reyes, Jose Don T. De Alban, Kyle W. Tomlinson

SOSE Affiliate: Manila Observatory

Yunnan Province, southwest China, has a monsoonal climate suitable for a mix of fire-driven savannas and fire-averse forests as alternate stable states, and has vast areas with savanna physiognomy. Presently, savannas are only formally recognised in the dry valleys of the region, and a no-fire policy has been enforced nationwide since the 1980s. Misidentification of savannas as forests may have contributed to their low protection level and fire-suppression may be contributing to vegetation change towards forest states through woody encroachment. Here, we present an analysis of vegetation and land-use change in Yunnan for years 1986, 1996, 2006, and 2016 by …

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Forging Ahead And Adapting To Change: A Review Of The Initiatives Of The Isprs Student Consortium, Sheryl Rose C. Reyes, Charmaine A. Cruz Jan 2022

Forging Ahead And Adapting To Change: A Review Of The Initiatives Of The Isprs Student Consortium, Sheryl Rose C. Reyes, Charmaine A. Cruz

SOSE Affiliate: Manila Observatory

The International Society for Photogrammetry and Remote Sensing Student Consortium (ISPRS SC) is an international organization that represents a constituency of the students and the young professionals with common interests and goals within ISPRS in the areas of photogrammetry, remote sensing and spatial information science. The ISPRS SC Board of Directors strengthened the organization’s foundations and increased its engagement in the Society from 2016 to 2022. Given the current global health crisis, selected members of the Board of Directors continued to serve in the ISPRS SC for a two-year extension and developed creative strategies in navigating the new normal. Building …

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Application Of Image Processing Programs In Color Analysis Of Wood Photodegradation, Gabriel Joseph D. Plata, Ramon M. Delos Santos Jan 2022

Application Of Image Processing Programs In Color Analysis Of Wood Photodegradation, Gabriel Joseph D. Plata, Ramon M. Delos Santos

Physics Faculty Publications

In general, polymer photodegradation is an important aspect of polymer science that is of great interest to chemistry, materials science, biology, and physics students who engage in this field of research. Wood consists of three main polymers, which makes it a good candidate for such photodegradation studies. Aside from structural changes based on chemical analysis, color change assessment can also be employed to check any extent of degradation on wood without the need for sophisticated analytical equipment. This study presents the application of two image processing programs in color analysis of wood photodegradation: ImageJ and Colormath library, which are Java-based …

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Online Algorithms With Advice For The 𝒌-Search Problem, Jhoirene B. Clemente, Henry N. Adorna, Proceso L. Fernandez Jr Jan 2022

Online Algorithms With Advice For The 𝒌-Search Problem, Jhoirene B. Clemente, Henry N. Adorna, Proceso L. Fernandez Jr

Department of Information Systems & Computer Science Faculty Publications

In the online search problem, a seller seeks to find the maximum price from a sequence of prices p1, p2,…, pn that is revealed in a piece-wise manner. The bound for all prices is well known in advance with m ≤ pί ≤ M. In the online k-search problem, the seller seeks to find the k maximum out of the n prices. In this paper, we present a tight bound of [Formula Presented] on the advice complexity of optimal online algorithms for online k-search. We also provide online algorithms with advice that use less than the required number of bits …

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Service Contracting As A Policy Response For Public Transport Recovery During The Covid-19 Pandemic: A Preliminary Evaluation, Varsolo Sunio, Wilhansen Joseph Li, Joemier Pontawe, Albert Dizon, Joel Bienne Valderrama, Agnes Robang Jan 2022

Service Contracting As A Policy Response For Public Transport Recovery During The Covid-19 Pandemic: A Preliminary Evaluation, Varsolo Sunio, Wilhansen Joseph Li, Joemier Pontawe, Albert Dizon, Joel Bienne Valderrama, Agnes Robang

Department of Information Systems & Computer Science Faculty Publications

We examine and assess the service contracting (SC) program implemented for the first time in Metro Manila, Philippines as a response to the impact of the pandemic on road-based public transport sector. We develop an evaluation framework, consisting of three indicators: social amelioration, increase in transport supply and performance improvement. These indicators are the purported objectives of SC. Using a mix of qualitative and quantitative methods, our evaluation suggests that although SC has brought positive impact in terms of the first two indicators, there is no robust evidence so far that may suggest that SC has improved the performance of …

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H^Soft Open Set In Soft Topological Space, S.M. Darwesh, A.A. Nasef, A.I. Aggour, A. Fathy Jan 2022

H^Soft Open Set In Soft Topological Space, S.M. Darwesh, A.A. Nasef, A.I. Aggour, A. Fathy

Al-Azhar Bulletin of Science

We introduce in this work, a novel concept in the realm of soft sets which is called h^ soft open set is presented. The foundational properties of this novel concept are explored, and its connections with various other soft set types are examined.

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Structural Interpretation And Petrophysical Approach For Subsurface Fractureidentification Of Joya Mair Area, Nw-Himalayas, Pakistan, Palwasha Shahzad Rathore, Muhammad Armaghan Faisal Miraj, Muhammad Bilal Malik, Sher Afgan, Rana Faizan Saleem, Shan Shahzad, Irza Akhtar Jan 2022

Structural Interpretation And Petrophysical Approach For Subsurface Fractureidentification Of Joya Mair Area, Nw-Himalayas, Pakistan, Palwasha Shahzad Rathore, Muhammad Armaghan Faisal Miraj, Muhammad Bilal Malik, Sher Afgan, Rana Faizan Saleem, Shan Shahzad, Irza Akhtar

Turkish Journal of Earth Sciences

Identification of fracture zone is a challenging task without the image log data. There are many brownfields around the world where the image log has not been acquired; therefore, there must be an alternative way of fracture identification. In this paper, a conventional log response technique for fracture delineation has been discussed. The study area lies in the Upper Indus Basin of Pakistan, which is sub-divided into the Kohat and Potwar basins. Minwal-X-1 of Joya Mair area, which lies in the Potwar Basin, is selected for this purpose. Eocene limestone units are formed due to fracture porosity. The objective of …

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