bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preliminary analysis of meteorological and seasonal influences on crustal gas emission relevant to earthquake prediction
Authors: Klusman Ronald W. , Webster James D. 
Published: June 2021

abstract
The emission of gas from the Earth's crust is a complex process influenced by meteorological and seasonal parameters. The use of gas emission as a tool in earthquake prediction will require an understanding of these influences. Radon emanation has been integrated over weekly intervals and free mercury vapor emission over 212 hour intervals at a low seismic risk site in Colorado.
Radon measured by the Track Etch® technique ranged from 136 to 1750 tracks/mm2 (81 to 1040 pC/liter) over the 1-yr period of the experiment. There was a strong correlation of radon emanation with: instrument vault temperature, barometric pressure, outside temperature, soil temperature, and whether or not the surface soil was frozen. Seasonal influences on radon emanation are important with 94 per cent of the variance being accounted for by the measured meteorological and seasonal parameters.
Mercury concentrations in the instrument vault ranged from &lt;1 to 53 ng/m3 over the 1 yr. Mercury emission correlates with vault temperature, vault relative humidity, outside temperature, barometric pressure, soil temperature and moisture, and the soil freeze-thaw cycle. Diurnal cycles are common but do not occur on all days. Other short-term noise in mercury emission is also important and phase shift or phase lag effects are important. Only 32 per cent of the variance in mercury emission can be accounted for by the measured meteorological and seasonal parameters. The short-term noise coupled with phase lags are important factors in mercury emission rates.
Effects of temporal variations in seismicity on seismic hazard
Authors: McGuire Robin K. , Barnhard Theodore P. 
Published: June 2021

abstract
The accuracy of stationary mathematical models of seismicity for calculating probabilities of damaging shaking is examined using the history of earthquakes in China from 1350 A.D. to 1949 A.D. During this time, rates of seismic activity varied periodically by a factor of 10. Probabilities of damaging shaking are calculated in 62 cities in North China using 50 yr of earthquake data to estimate seismicity parameters; the probabilities are compared to statistics of damaging shaking in the same cities for 50 yr following the data window. These comparisons indicate that the seismic hazard analysis is accurate if: (1) the maximum possible earthquake size in each seismogenic zone is determined from the entire seismic history rather than from a short-time window; and (2) the future seismic activity can be estimated accurately. The first condition emphasizes the importance of realistically estimating the maximum possible size of earthquakes on faults. The second indicates the need to understand possible trends in seismic activity where these exist, or to develop an earthquake prediction capability with which to estimate future activity. Without the capability of estimating future seismicity, stationary models provide less accurate but generally conservative indications of seismic ground-shaking hazard.
In the United States, the available earthquake history is brief but gives no indication of changing rates of activity. The rate of seismic strain release in the Central and Eastern United States has been constant over the last 180 yr, and the geological record of earthquakes on the southern San Andreas Fault indicates no temporal trend for large shocks over the last 15 centuries. Both observations imply that seismic activity is either stationary or of such a long period that it may be treated as stationary for seismic hazard analyses in the United States.
P-wave spectra forML5 foreshocks, aftershocks, and isolated earthquakes near Parkfield, California
Authors: Bakun Willian H. , McEvilly Thomas V. 
Published: June 2021

abstractWood-Anderson seismograms recorded at Mount Hamilton (MHC, 185 km, 327°), Santa Barbara (SBC, 180 km, 158°), and Tinemaha (TIN, 240 km, 56°) provide data for comparing P-wave spectra for two immediate (17-min) foreshocks, one early (55-hr) foreshock, two aftershocks, and two “isolated” Parkfield earthquakes. All are ML 5.0 shocks with epicenters within 7 km of the common epicenter of the 1934 and 1966 Parkfield main shocks. The set of events is well suited for testing the hypothesis that foreshocks are high-stress-drop sources. Calculated stress drops are controlled by source directivity at azimuths aligned with the fault break (at MHC and SBC). P-wave radiation from the three foreshocks is focused along one fault trace azimuth, suggesting that foreshock sources are characterized by pronounced unilateral rupture expansion. At TIN, broadside to the fault where directivity has minimum effect on calculated relative stress drop, the two immediate foreshocks are higher stress-drop sources. The early foreshock is a low-to-average stress-drop source, indicating the possibility that stress concentration is a rapidly occurring phenomenon in rupture nucleation. Alternatively, the stress field is highly variable on the scale of 2 to 3 km in the focal region of an impending earthquake with a rupture length of 20 to 30 km.
The purpose and effects of earthquake codes
Authors: Zsutty Theodore C. , Shah Haresh C. 
Published: June 2021

abstract
When large earthquakes occur and there is significant damage and destruction of building structures, an almost universal response is the demand for better (and usually bigger) building codes. This paper examines the effects of this public outcry for protection with respect to the economic consequences, the actual process of seismic code formulation, and the technical adequacy of our present knowledge and design procedures. Some general directions are suggested such that new codes can be: better understood with respect to their intended design objectives; economically feasible; and practically enforceable.
Dynamic inelastic analyses of a bridge structure
Authors: Gillies A. G. , Shepherd R. 
Published: June 2021

abstract
The necessity for framed structures to be capable of dissipating significant amounts of energy inelastically under severe earthquake excitation is generally acknowledged. Bridge structures differ from buildings in their seismic lateral resistance mechanism in so far as they generally possess a small number of clearly identifiable potential zones in which plastic yield can occur and consequently tend to be amenable to postelastic studies. This paper presents the application of an analysis technique in which the response time history of a bridge structure, treated as a three-dimensional frame, is determined by direct integration of the equations of motion with allowances incorporated for inelastic member behavior. Aspects studied include the differences in responses predicted using a nonlinear three-dimensional model rather than a planar frame idealization and the effect of unequal span lengths or torsional vibrations.
Effects of fault finiteness on near-source ground motion
Authors: Archuleta Ralph J. , Hartzell Stephen H. 
Published: June 2021

abstractNear-source ground motion at four azimuths but constant epicentral range is computed from a buried circular strike-slip fault in a half-space. Particle acceleration, velocity, and displacement at each station on the free surface is computed in the frequency band 0.0 to 5.0 Hz. The assumed dislocation is derived from the Kostrov (1964) displacement function for a continuously propagating stress relaxation. The azimuthal variations in the amplitudes and waveforms directly result from spatially varying slip on the fault, spatially varying radiation pattern over the fault, and the magnitude and direction of the rupture velocity. The near-source ground motions are dominated by the rupture in the direction of the receiver.Using a 100-bar effective stress (initial stress minus sliding friction) in a Poisson solid with β = 3.0 km/sec the shear wave speed, and shear modulus μ = 3.0 × 1011 dyne/cm2, the simulated earthquake has a moment Mo = 4.5 × 1025 dyne-cm. Using a rupture velocity of 0.9β, the peak acceleration is 1195 cm/sec2 and velocity 104 cm/sec for the receiver directly on strike. For a receiver 30° off strike, the maximum acceleration 236 cm/sec2 occurs on the vertical component.
A simple method to calculate Green's functions for elastic layered media
Authors: Bouchon Michel 
Published: June 2021

abstractGreen's functions for an elastic layered medium can be expressed as a double integral over frequency and horizontal wavenumber. We show that, for any time window, the wavenumber integral can be exactly represented by a discrete summation. This discretization is achieved by adding to the particular point source an infinite set of specified circular sources centered around the point source and distributed at equal radial interval. Choice of this interval is dependent on the length of time desired for the point source response and determines the discretized set of horizontal wavenumbers which contribute to the solution. Comparisons of the results obtained with those derived using the two-dimensional discretization method (Bouchon, 1979) are presented. They show the great accuracy of the two methods.
Broadband time domain modeling of earthquakes from Friuli, Italy
Authors: Cipar John 
Published: June 2021

abstractShort-period (SP) and long-period (LP) seismograms written by the main shock and two principal aftershocks of the 1976 Friuli, Italy, earthquake sequence are modeled in the time domain using synthetic seismograms. The main shock occurred on 6 May 1976 (20h 00m, Ms = 6.5) and both aftershocks on 15 September 1976 (03h 15m, Ms = 6.0 and 09h 21m, Ms = 5.9). Source models were determined initially by trial and error and then refined using a waveform inversion program. Two point sources of radiation are required to adequately model the aftershock short-period records. For the 09h 21m aftershock, the model derived from short-period records also produces good fits to the long-period data. The seismic moment of this earthquake is found to be 0.8 to 1.0 × 1025 dyne-cm. The SP model for the 03h 15m aftershock, on the other hand, predicts long-period synthetics which do not agree with the observations. In particular, the SP moment (0.37 × 1025 dyne-cm) is about 212 times smaller than the LP moment (1 × 1025 dyne-cm). Adding a long-period component to the SP model considerably improves LP waveform and moment agreement. In the case of the main shock, a reasonable fit to the observed SP data is obtained using three point sources of radiation. However, LP synthetics computed using this model do not agree with the observations, and the SP moment (0.65 × 1025 dyne-cm) is a small fraction of the LP moment (3 to 5 × 1025 dyne-cm). Time function durations indicate that the individual events inferred from the SP records are radiated from patches of the fault having radii of 2 to 4 km and stress drops in the range 35 to 276 bars. In comparison, stress drops estimated from LP data are found to be 12 bars (main shock) and 24 bars (09h 21m aftershock). These observations suggest that the short-period instruments are sensitive to the high-frequency radiation emitted from small, high-stress drop areas on the fault plane whereas the long-period instruments record the overall motion during the earthquake.
E-Services in Sudan During the Covid-19 Pandemic as a Model: a Case Study of University of Bahri-Sudan
Authors: Ibrahim Adil Hassan 
Published: June 2021

The study aims to explore the barriers of online learning in Sudan. The achievement of the research purpose requires an approach which is not only describes the relations between variables, but also the experience of the stakeholders, therefore, the study adopted mixed mothed approach. To collect data, the study used two sources; secondary, and primary data sources. The secondary sources included peer-review international journals from recognized publishers, books, newspapers and reports. The primary sources included questionnaires and interviews. 132 participants were surveyed. Two professors were interviewed. SPSS was used to analyze the data. The findings indicate that there are five unique barriers to e-learning adoption in Sudan including; poor network infrastructure, lack of bandwidth in rural areas, electricity outages, lack of electricity in rural areas, and stakeholder’s deficiency of e-skills. Furthermore, the study showed that some professors are old, and they resist the adoption of e-learning. Likewise, the study found that 67% of respondents were not able to access the internet in their areas during Covid19 lockdown, 25% of respondents do not possess computers, 35% of respondents did not receive training for gaining E-skills, and 74% of respondents prefer learning in classrooms. The study concluded that, E-learning to be adopted in Sudan, several steps can be taken such as e-skills intensive training for stakeholders, support of stakeholders, electricity and internet networks connection to whole parts of Sudan, poverty combat, and stimulation of students to accept e-learning.
Study of socio-demographic, behavioural and clinical risk factors of diabetic foot in a tertiary care centre
Authors: Sachin Idoor D. , Manasa Megaravalli R. , Subhashree P. 
Published: June 2021

Background: Diabetic foot is the most devastating complication of diabetes. Diabetic foot infection is a potential limb threatening condition. Several socio-demographic, behavioural and clinical factors are responsible for higher risk of diabetic foot. Hence this study was planned with the objective to assess association between socio-demographic, behavioural and clinical risk factors and diabetic foot and response of patients to various treatment modalities.Methods: 50 patients of diabetic foot were studied over a six-month period. The diabetic foot ulcers were classified according to Wagner’s classification. Data about various socio-demographic, behavioural and clinical factors was collected. Radiological investigations, neurological examination and culture and sensitivity of ulcer discharge was done. The patients were managed by conservative or surgical management. Results: Common age group of presentation was 51-60 years. Males were more commonly affected. All participants were of low socio-economic status and majority were unskilled labourers. Tobacco (40%) and alcohol (32%) use and lack of physical activity (92%) were seen. All had diabetes of >10 years and elevated BMI. Grade 4 ulcer were the most frequent and toes were commonly involved. S. aureus was the commonest organism. Wound debridement was done in 76% patients and 34% required amputation.Conclusions: Factors like advancing age, low socio-economic status, lack of family support, occupations involving risk of trauma to foot, tobacco use, sedentary life style, and clinical factors like longer duration of diabetes, higher BMI, uncontrolled diabetes are risk factors for diabetic foot. Hence it is essential to educate the diabetic patients about these risk factors.
Evaluation of the relationship between the uses of safety procedures in the rate of human error in Yazd Combined Cycle Power Plant
Authors: Boghri F , Baghaeikhah H , Madadizadeh F , Halvani GH 
Published: June 2021

Introduction: About 60 to 90 percent of an accident in the industry is caused by human error. This study aimed to assess the effectiveness of safety procedures in reducing human error in Yazd Combined Cycle Power Plant employees.

Materials and Methods: The present study is a quasi-experimental intervention that was conducted aimed to measure the human error of 121 employees of Yazd Combined Cycle Power Plant in 5 occupational groups (safety and firefighting, generator operation, generator operation, chemical refinery, warehouse keeping, and generator repair) in 2020. First, job safety analysis (JSA) was performed. Safety procedures related to each job were prepared, and with the help of their items and observing the process of doing work, the percentage of human error before and after the investigation was calculated. The data were analyzed using descriptive statistical indicators including mean, standard deviation, median, interquartile range, frequency and frequency percentage, and Wilcoxon nonparametric test by SPSS software version 24. The significance level was considered 0.05.

Results: A study on five main jobs, according to Wilcoxon test results showed, the highest and lowest human error percent before the intervention was related to generator repair occupational groups (58.59%) and warehouse keeping (4.16%). A significant difference was between human error percent before (433.41 ± 35.14) and after (440.21 ± 29.29) the intervention (p <0.001).

Conclusion: This study showed that performing job safety analysis and implementing safety procedures related to each job will decrease people's human error percent. Therefore, the implementation of safety procedures related to each job was suggested to the industry. This procedure must be obtained by careful job analysis, and an appropriate procedure should be developed using a panel of experts.
Investigating the relationship between noise and occupation on the status of mental disorders and depression of workers using questionnaire (DASS) and (BAKK) in steel industries
Authors: Alimoradi H , Nazari M , Fallah Madavari R , Jafari Nodooshan R , Zare Sakhvidi MJ , Ajdani A 
Published: June 2021

Introduction: In most industrial environments, people are exposed to noise daily. Exposure to this physical hazard can lead to cognitive impairment in individuals. Noise, like all pollutants, reduces the quality of life and causes significant mood disorders in people. The present study examines a set of cognitive factors to assess the mental health status of workers in terms of depression and stress in a noisy workplace.
Materials and Methods: In a descriptive-analytical study in 1399, 1100 steelworkers were evaluated to determine the degree of depression and mood swings. The data were analyzed through a public call at the Isfahan Steel Plant. ISO 9612 (2009) standard was used to measure the sound pressure level. In addition to conducting clinical interviews, subjects answered the BAKK Depression Inventory and the DASS-42 Inventory Depression Scale. Data were analyzed using SPSS software (v. 22).
Results: Based on the findings of the study, annoying noise (above 85 decibels) had a significant effect on age factor on depression, marital status factor on anxiety, and shift factor on stress and self-criticism of employees (p <0.05). The mean of the stress variable in the case group was significantly higher than the control group (p <0.001), which indicates the effect of sound intensity level on increasing stress and depression in a noisy environment.
Conclusion: The results of this study: Occupational noise higher than the standard 85 dB can have devastating effects on moods and various dimensions of workers' cognitive status.
El proceso hacia la paridad en América Latina a la luz de una ideología participativa. Propuesta metodológica aplicable a estudios interdisciplinares de género y ciudadanía de las mujeres
Authors: Aguirrezabal Quijera Irune 
Published: June 2021

Este artículo describe una propuesta metodológica elaborada para abordar investigaciones vinculadas a estudios de género y, en particular, sobre la ciudadanía de las mujeres. La metodología se enfrenta a los problemas de investigacion desde una aproximación interdisciplinar, integral y circular, vinculando el cuestionamiento que impulsa el pensamiento teórico feminista sobre nociones y paradigmas tradicionales del orden social, económico y político con la praxis, con las tensiones y sinergias estratégicas que se producen en contextos diferenciados. El artículo muestra su aplicación a una investigación ya realizada sobre el proceso hacia la paridad en América Latina. Los dos elementos metodológicos que singularizan el análisis crítico en el que se basa la metodología son: (1) un diálogo circular, con un cuestionamiento constante entre la perspectiva analítica conceptual y la contextual (que en la investigación a la que ha sido aplicada resultó en una estructura tridimensional del fenómeno descrito: conceptual, evolutiva en el tiempo y espacio, y del progreso que surge a partir de la tensión entre acción-resistencia); y (2) el amplio y diverso repertorio de fuentes filosóficas, comentadas y participativas, originadas por los mismos actores involucrados en el fenómeno analizado, el «proceso paritista latinoamericano», a la luz de una ideología participativa. La metodología dirigida a investigaciones académicas persigue resolver problemas reales, de ahí que, junto a una metodología cualitativa crítica, en la que se analizan fenómenos, causas, contextos y actores, se propone, además, formular un enfoque prescriptivo, con ánimo propositivo.
Recibido: 02 noviembre 2020Aceptado: 14 mayo 2021
Genetic of Salak Pondoh, Gading Varieties and Its Hybrids Based on RAPD Markers
Authors: Nandariyah Nandariyah , Parjanto Parjanto , Ratu Pinaka Pinasti 
Published: June 2021

<p>A molecular marker of parent and offspring is used to find fast and accurate markers influenced by DNA isolation and amplification. This research aims to find the most suitable DNA isolation and DNA amplification methods. This study used four DNA isolation methods; namely IM01, IM02, IM03, and IM04. DNA amplification used ten protocols (AP01, AP02, AP03, AP04, AP05, AP06, AP07, AP08, AP09, and AP010). The results of the research showed that the most suitable DNA isolation method for salak was IM0, and the most suitable DNA amplification for salak was AP04 that produces the highest value of DNA bands.</p><p><strong> </strong></p><p>Keywords: DNA isolation; DNA amplification; hybrids.</p>
Pesticides Misused for Bed Bug Control: Comparing Professional and Nonprofessional Applications Reported to the National Pesticide Information Center, 2013–2017
Authors: Strid April , Leytem Alicia , Perez Josean , Buhl Kaci , Cross Amy 
Published: June 2021

Objectives. To compare outcomes when pesticides are used to control bed bugs by professionals and nonprofessionals. Methods. All US National Pesticide Information Center inquiries from 2013 to 2017 were assessed to identify scenarios involving bed bugs and pesticide applications. Cases were evaluated with respect to types of applicators, misapplications, and human pesticide exposures. Results. Misapplications were more than twice as likely to be reported in cases involving nonprofessional applications (14%) as in cases involving professional applications (5%). Human exposures to pesticides were reported more often when pesticides were misapplied (70%) than when there were no apparent misapplications (31%). Conclusions. Both professionals and nonprofessionals may misuse pesticides to control bed bugs, which may increase the risks of exposure and adverse outcomes. Policy interventions may reduce pesticide incidents related to bed bug control by promoting professional involvement and adherence to product label instructions.