scholarly journals Complexity-Aware Simple Modeling

2018 ◽  
Author(s):  
Mariana Gómez-Schiavon ◽  
Hana El-Samad
Keyword(s):  
Mathematical Models ◽  
Large Scale ◽  
The Other ◽  
Small Scale ◽  
List Type ◽  
Unknown Parameters ◽  
New Approach ◽  
Complex Interactions ◽  
Scale Models ◽  
Simple Modeling

AbstractMathematical models continue to be essential for deepening our understanding of biology. On one extreme, simple or small-scale models help delineate general biological principles. However, the parsimony of detail in these models as well as their assumption of modularity and insulation make them inaccurate for describing quantitative features. On the other extreme, large-scale and detailed models can quantitatively recapitulate a phenotype of interest, but have to rely on many unknown parameters, making them often difficult to parse mechanistically and to use for extracting general principles. We discuss some examples of a new approach — complexity-aware simple modeling — that can bridge the gap between the small‐ and large-scale approaches.HighlightsSimple or small-scale models allow deduction of fundamental principles of biological systemsDetailed or large-scale models can be quantitatively accurate but difficult to analyzeComplexity-aware simple models can extract principles that are robust to the presence of unknown complex interactionsGraphical abstract

scholarly journals Screening and potent applicability analysis of commonly used pesticides against desert locust: an integrative entomo-informatics approach

2020 ◽  
Author(s):  
Anik Banik ◽  
Md. Fuad Mondal ◽  
Md. Mostafigur Rahman Khan ◽  
Sheikh Rashel Ahmed ◽  
Md. Mehedi Hasan
Keyword(s):  
Binding Affinity ◽  
Large Scale ◽  
Schistocerca Gregaria ◽  
Indian Subcontinent ◽  
Locusta Migratoria ◽  
Field Trials ◽  
The Other ◽  
List Type ◽  
Agricultural Pesticides ◽  
Global Threat

AbstractThe locust problem is a global threat for food security. Locusts can fly and migrate overseas within a zip and creating a large-scale devastation to the diversified agro-ecosystem. GIS based analysis showed the recent movement of locusts, among them Schistocerca gregaria and Locusta migratoria are predominant in Indian subcontinent and are found more notorious and devastating one. This devastation needs to be stopped to save human race from food deprivation. In our study, we screened some commonly used agricultural pesticides and strongly recommended three of them viz. biphenthrin, diafenthiuron and silafluofen which might be potential to control the desert locusts based on their binding affinity towards the locust’s survival proteins. Our phylogenetic analysis reveals that these three recommended pesticides might also show potency to the other locust species as well as they are also way safer than the other commercially available pesticides. These proposed pesticide’s bioactive analogs from fungus and bacteria may also show efficacy as next generation controlling measures of locust as well as different kind of pests. These recommended pesticides are expected to be highly effective against locusts and needs to bring forward by the entomologists’ by performing experimental field trials.HighlightsGIS map unmasked the 2020 migratory pattern of locusts which now predominant towards Indian subcontinent.Biphenthrin, diafenthiuron and silafluofen showed maximum binding affinity.Biphenthrin and diafenthiuron were relatively safer than silafluofen.Bioactive analogs from fungus and bacteria could be an alternative to control locusts.Pesticides inhibition hotspots for desert locusts were unrevealed.

The Perks and Perils of Interdisciplinary Research

2018 ◽  
Vol 26 (S2) ◽  
pp. S55-S67 ◽  
Author(s):  
Erin Leahey
Keyword(s):  
Interdisciplinary Research ◽  
Large Scale ◽  
Policy Implications ◽  
The Other ◽  
Small Scale ◽  
Extra Time ◽  
Empirical Assessment ◽  
Cognitive Challenges

This paper synthesizes findings from two studies the author conducted that examine how engagement in interdisciplinary research (IDR) influences scholars’ careers. Results from these two studies, one large-scale and quantitative and the other small-scale and qualitative, provide a much needed empirical assessment of IDR’s effects on individual careers. In essence, they provide a nice antidote (and some caution) to the rhetoric and enthusiasm surrounding IDR. My co-authors of these studies and I find that engaging in interdisciplinary research increases a scholar’s visibility in terms of citations, but also presents challenges, including reduced productivity, cognitive challenges, lack of support, extra time and commitment, and framing of one’s work. This paper concludes by discussing the policy implications of this research.

scholarly journals Balanced reconnection intervals: four case studies

2008 ◽  
Vol 26 (12) ◽  
pp. 3897-3912 ◽  
Author(s):  
A. D. DeJong ◽  
A. J. Ridley ◽  
C. R. Clauer
Keyword(s):  
Case Studies ◽  
Large Scale ◽  
The Other ◽  
Small Scale ◽  
Polar Cap ◽  
Reconnection Rate ◽  
Magnetospheric Convection ◽  
The Third ◽  
New Name ◽  
Definition Of

Abstract. During steady magnetospheric convection (SMC) events the magnetosphere is active, yet there are no data signatures of a large scale reconfiguration, such as a substorm. While this definition has been used for years it fails to elucidate the true physics that is occurring within the magnetosphere, which is that the dayside merging rate and the nightside reconnection rate balance. Thus, it is suggested that these events be renamed Balanced Reconnection Intervals (BRIs). This paper investigates four diverse BRI events that support the idea that new name for these events is needed. The 3–4 February 1998 event falls well into the classic definition of an SMC set forth by Sergeev et al. (1996), while the other challenge some previous notions about SMCs. The 15 February 1998 event fails to end with a substorm expansion and concludes as the magnetospheric activity slowly quiets. The third event, 22–23 December 2000, begins with a slow build up of magnetospheric activity, thus there is no initiating substorm expansion. The last event, 17 February 1998, is more active (larger AE, AL and cross polar cap potential) than previously studied SMCs. It also has more small scale activity than the other events studied here.

scholarly journals Precipitation Atlas for Germany (GePrA)

Atmosphere ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 737
Author(s):  
Christopher Jung ◽  
Dirk Schindler
Keyword(s):  
Spatial Resolution ◽  
Large Scale ◽  
High Spatial Resolution ◽  
Spline Interpolation ◽  
Absolute Error ◽  
Coefficient Of Determination ◽  
Small Scale ◽  
Monthly Precipitation ◽  
New Approach ◽  
Very High Spatial Resolution

A new approach for modeling daily precipitation (RR) at very high spatial resolution (25 m × 25 m) was introduced. It was used to develop the Precipitation Atlas for Germany (GePrA). GePrA is based on 2357 RR time series measured in the period 1981–2018. It provides monthly percentiles (p) of the large-scale RR patterns which were mapped by a thin plate spline interpolation (TPS). A least-squares boosting (LSBoost) approach and orographic predictor variables (PV) were applied to integrate the small-scale precipitation variability in GePrA. Then, a Weibull distribution (Wei) was fitted to RRp. It was found that the mean monthly sum of RR ( R R ¯ s u m ) is highest in July (84 mm) and lowest in April (49 mm). A great dependency of RR on the elevation (ε) was found and quantified. Model validation at 425 stations showed a mean coefficient of determination (R2) of 0.80 and a mean absolute error (MAE) of less than 10 mm in all months. The high spatial resolution, including the effects of the local orography, make GePrA a valuable tool for various applications. Since GePrA does not only describe R R ¯ s u m , but also the entire monthly precipitation distributions, the results of this study enable the seasonal differentiation between dry and wet period at small scales.

scholarly journals Modeling Emissions from Concentrated Sources into Large-Scale Models: Theory and apriori Testing

Atmosphere ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 863
Author(s):  
Roberto Paoli
Keyword(s):  
Large Scale ◽  
General Procedure ◽  
Chemical Transport ◽  
Reaction Rates ◽  
Small Scale ◽  
Background Concentrations ◽  
Transport Models ◽  
Chemical Transport Models ◽  
Scale Models ◽  
Effective Reaction

This paper presents a general procedure to incorporate the effects emissions from localized sources, such as aircraft or ship engines, into chemical transport models (CTM). In this procedure, the species concentrations in each grid box of a CTM are split into plume or small-scale concentrations and background concentrations, respectively, and the corresponding conservation equations are derived. The plume concentrations can be interpreted as subgrid contributions for the CTM grid-box averaged concentrations. The chemical reactions occurring inside the plume are parameterized by introducing suitable “effective” reaction rates rather than modifying the emission indices of the species inside the plume. Various methods for implementation into large-scale models are discussed that differ by the accuracy of the description of plume process. The mathematical consistency of the method is verified on simple idealized setting consisting of a reactive plume in homogeneous turbulence.

Large Scale Fracture Mechanics Testing

2008 ◽  
Author(s):  
Milan Brumovsky
Keyword(s):  
Czech Republic ◽  
Fracture Mechanics ◽  
Pressure Vessel ◽  
Large Scale ◽  
The Other ◽  
The Czech Republic ◽  
Short Overview ◽  
Scale Models ◽  
Leak Before Break ◽  
Reactor Pressure

This paper gives a short overview of experimental programs using large scale models/experiments realized in the Czech Republic with the aim to support the reactor pressure components of WWER type reactors. One part of the program was concentrated on reactor pressure vessel components only. It contained flat specimens with defects on one side and models with stress concentrators (nozzles, bolting joints) on the other side. Second part of the program was a part of the LBB (Leak-before-break) project applied to all WWER safety related pipings. Large scale models with defects, located in heterogenous (safe-end) as well as homogenous welds are described.

A Method for Bonding PDMS Without Using Plasma

2010 ◽  
Author(s):  
Cristina Martin ◽  
Aarash Y. N. Sofla
Keyword(s):  
Hydrochloric Acid ◽  
Adhesion Strength ◽  
Glass Sample ◽  
Large Scale ◽  
The Other ◽  
Laboratory Research ◽  
Small Scale ◽  
Manufacturing Processes ◽  
Inexpensive Method ◽  
Chlorine Gas

The vapor-assisted treatment constitutes a simple and inexpensive method to increase the adhesion strength of polydimethylsiloxane and glass without using plasma. In this method, the targeted PDMS-glass sample is exposed to a vapor in an enclosed container for a certain time. Different chemicals were tested as possible vapor sources. No increase in the adhesion strength of PDMS-glass samples was observed when silanes without chloro functional groups were used. On the other hand, all alkyl trichlorosilanes tested in this study led to permanent bondings. In addition, an increase in the strength of the PDMS-glass adhesion was obtained with di- and monochlorosilanes as well as with hydrochloric acid solution. These results experimentally demonstrate that the hydrogen chlorine gas assists with the PDMS-glass bonding, making the vapor-assisted treatment a method with multiple applications in both small scale laboratory research and large scale manufacturing processes.

Mesoscale Spectra of Mars’s Atmosphere Derived from MGS TES Infrared Radiances

2007 ◽  
Vol 64 (5) ◽  
pp. 1717-1726 ◽  
Author(s):  
Takeshi Imamura ◽  
Yasuhiro Kawasaki ◽  
Tetsuya Fukuhara
Keyword(s):  
Seasonal Variation ◽  
Large Scale ◽  
Thermal Emission ◽  
The Other ◽  
Small Scale ◽  
High Latitudes ◽  
Mars Global Surveyor ◽  
Infrared Radiance ◽  
Infrared Radiances ◽  
Radiance Data

Abstract Wavenumber spectra of the atmospheric potential energy of Mars at mesoscales (wavelengths of 64–957 km) were obtained as a function of latitude, season, and Martian year using infrared radiance data obtained by the Thermal Emission Spectrometer (TES) onboard the Mars Global Surveyor (MGS) spacecraft. Spectral slopes tend to be flatter at smaller scales, and the slopes are usually flatter than −1 near small-scale ends. Near large-scale ends, the spectra sometimes show prominent steepening with slopes from −2 to −3. The power peaks in the high latitudes in winter and equinoxes, suggesting that eddies are generated preferentially in baroclinic zones. The seasonal variation at each latitude band, on the other hand, tends to be obscured by large interannual variability. An enhancement in the power was observed around the storm tracks in the Southern Hemisphere. Spectra of the terrestrial stratosphere were also obtained with a similar method from data taken by the Aura satellite and compared to the results for Mars.

scholarly journals Pengembangan model permainan tradisional untuk membangun karakter pada siswa SD kelas atas

2017 ◽  
Vol 5 (2) ◽  
pp. 183 ◽  
Author(s):  
Puput Widodo ◽  
Ria Lumintuarso
Keyword(s):  
Large Scale ◽  
Relevant Literature ◽  
Field Studies ◽  
Development Stage ◽  
Small Scale ◽  
School Students ◽  
Educational Models ◽  
Central Java ◽  
Scale Models ◽  
The Media

Penelitian ini mengadaptasi penelitian dan pengembangan pendidikan model Borg & Gall dengan menyederhanakan menjadi 2 tahapan sebagai berikut (1) tahap pra-pengembangan, tahapan ini meliputi (a) kajian literatur dan penelitian relevan dan (b) studi lapangan, (2) tahap pengembangan, tahapan ini meliputi (a) penyusunan draf, (b) validasi ahli, (c) uji coba model skala kecil, (d) uji coba model skala besar, dan (e) produk akhir. Uji coba skala kecil dilakukan terhadap 30 anak kelas atas SDN Aditirto Pejagoan Kebumen, Provinsi Jawa Tengah. Uji coba skala besar dilakukan terhadap 130 anak kelas atas dari SD Negeri 1 Karangpoh, 26 siswa SD Negeri 1 Logede, 22 siswa SD Negeri 4 Pejagoan, 24 siswa SD Negeri 1 Kebulusan, dan 30 siswa SD Negeri 3 Kebulusan Kecamatan Pejagoan, Kabupaten Kebumen, Provinsi Jawa Tengah. Instrumen yang digunakan untuk mengumpulkan data adalah wawancara, kuisioner penilaian karakter permainan tradisional, kuisioner observasi pengembangan permainan tradisional, kuisioner observasi keefektifan model permainan tradisional, kuisioner penilian observasi ahli media, dan kuisioner evaluasi siswa. Hasil penelitian berupa pengembangan model permainan tradisional terdiri dari 3 jenis permainan yaitu: (1) permainan goteng, (2) lari papan/segi empat, dan (3) kasti tangan. Berdasarkan penilaian para ahli materi dan guru penjasorkes dapat disimpulkan bahwa pengembangan model permainan tradisional yang disusun sangat baik dan efektif, sehingga model permainan layak digunakan untuk pembelajaran pendidikan jasmani pada siswa kelas atas. Developing Models of Traditional Games to Build Characters of Elementary School Students of Upper Grades AbstractThe study was conducted through two stages by adapting the research and development of educational models Borg & Gall as follows (1) pre-development stage, this stage include (a) review of relevant literature and research, and (b) field studies, (2) the development stage, this stage include; (a) drafting, (b) validation expert, (c) testing of small-scale models, (d) testing large-scale models, and (e) of the final product.The small-scale tryout was conducted by involving 30 students of upper grades of state elementary schools (SES) of Aditirto, Pejagoan sub-district, Kebumen regency, Central Java porovinsi. The large-scale tryout was conducted by involving 130 students of upper grades of SES 1 of Karangpoh, 26 students of SES 1 of Logede, 22 students of SES 4 of Pejagoan, 24 students of SES 1 of Kebulusan, and 30 students of SES 3 of Kebulusan Pejagoan sub-district, Kebumen regency, Central Java porovinsi. The data collecting instruments were an interview guideline, a questionnaire to assess characters of traditional games, a questionnaire to assess the traditional game development, a questionnaire for the assessment by the media expert, and a questionnaire for the evaluation by students. The results of the study of the development of models of traditional games were three types of games, i.e: (1) goteng game, (2) board/rectangle running, and (3) hand kasti. Based on the assessment by the materials experts and the teachers of physical, sports, and health education, it could be concluded that the developed modals of traditional games were very good and effective so that they were appropriate to be used in the learning physical education for the students of upper grades.

scholarly journals Modelling erosion and deposition in geophysical granular mass flows

2021 ◽  
Vol 52 (1) ◽  
pp. 29-32
Author(s):  
Sylvain Viroulet ◽  
Chris Johnson ◽  
Nico Gray
Keyword(s):  
Debris Flows ◽  
Large Scale ◽  
Laboratory Experiments ◽  
Pyroclastic Flows ◽  
Small Scale ◽  
Snow Avalanches ◽  
Erosion And Deposition ◽  
Granular Rheology ◽  
Scale Models ◽  
Mass Flows

During hazardous geophysical mass flows, such as rock or snow avalanches, debris flows and volcanic pyroclastic flows, a continuous exchange of material can occur between the slide and the bed. The net balance between erosion and deposition of particles can drastically influence the behaviour of these flows. Recent advances in describing the non-monotonic effective basal friction and the internal granular rheology in depth averaged theories have enabled small scale laboratory experiments (see fig. 1) to be quantitatively reproduced and can also be implemented in large scale models to improve hazard mitigation.

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