Unit Mobility Ratio Displacement Front Passing a Circular Permeability Discontinuity

1968 ◽  
Vol 8 (04) ◽  
pp. 347-350 ◽  
Author(s):  
R.W. Parsons
Keyword(s):  
Mobility Ratio ◽  
Model Description ◽  
Flow Models ◽  
Permeability Heterogeneity ◽  
Displacement Front ◽  
Natural Rock ◽  
Front Position ◽  
Planar Front ◽  
The Times ◽  
The Impact

Abstract When a displacement front encounters an isolated permeability heterogeneity, it will be perturbed permeability heterogeneity, it will be perturbed The details of this perturbation will depend on the heterogeneity size and shape, the permeability contrast, and the mobility ratio. This paper deals with the displacement front behavior for one, simple, mathematically tractable model: a circular permeability discontinuity and unit mobility ratio. The progress of an initially planar front is shown or four permeability planar front is shown or four permeability contrasts: k2/k1 = 0, 1, 2,... The front distortion is more pronounced than streamline and isopotential distortion and it approaches a constant shape downstream from the discontinuity. Introduction The impact of reservoir heterogeneities on oil displacing processes depends upon the variation of the heterogeneous property (frequency distribution), its disposition (spatial distribution), and the inherent stability of the displacement mechanism. The interplay of these factors plus the impracticability, if not impossibility, of describing a natural rock system in any detail makes exact displacement front movements difficult to determine. It is useful, however, to be able to qualitatively visualize what heterogeneities will do to a displacement front. In this respect certain simple models that can be treated analytically are of value. The following analysis will show the displacement front behavior for one such model. MODEL DESCRIPTION The flow field two-dimensional and infinite in extent. The fluid flow is single phase, steady state and unidirectional at x, y - +/- 00, or before insertion of the discontinuity. A circular permeability discontinuity is placed at the origin. permeability discontinuity is placed at the origin. Porosity and thickness are the same within and exterior to the Porosity and thickness are the same within and exterior to the heterogeneity. This is exactly the same model that was used by Greenkorn et al. to check analytically streamlines as determined by Hele-Shaw flow models and finite difference computer techniques. FRONT POSITION CALCULATIONS The results of displacement front calculations are presented in Figs. 1 through 4 for four different permeability contrasts: k2/ki = 0, 1/2, 2. m. The permeability contrasts: k2/ki = 0, 1/2, 2. m. The times corresponding to the front locations are the same for the 0 and oo cases, and for the 1/2 and 2 cases. The determination of front positions at various times is based on known analytical expressions for velocity potentials (phi) and stream functions (psi). SPEJ P. 347

scholarly journals Risk of Increased Acceptance for Organizational Nepotism and Cronyism during the COVID-19 Pandemic

Risks ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 59
Author(s):  
Grzegorz Ignatowski ◽  
Łukasz Sułkowski ◽  
Bartłomiej Stopczyński
Keyword(s):  
Qualitative Study ◽  
Quantitative Methods ◽  
Research Work ◽  
Negative Effects ◽  
Qualitative And Quantitative ◽  
Qualitative And Quantitative Methods ◽  
Work Related ◽  
Social And Economic Development ◽  
The Times ◽  
The Impact

Nepotism and cronyism are forms of favoritism towards certain people in the workplace. For this reason, they constitute a problem for organization managers, ethicists and psychologists. Identifying the impact of COVID-19 pandemic on the increase of nepotism and cronyism may provide a basis for organizations to assess their extent and to take possible measures to prevent their negative effects. At the same time, the research presented in the article may provide a basis for further research work related to nepotism and cronyism at the times of other threats, different from the pandemic. The aim of the article is to examine the impact of the COVID-19 pandemic on growing acceptance for nepotism and cronyism in Polish enterprises. Qualitative and quantitative methods have been included in the conducted research. Qualitative study aimed at improving knowledge of nepotism and cronyism and the impact of the COVID-19 pandemic on these phenomena, followed by a quantitative study conducted in order to verify the information obtained in the qualitative study. This research has demonstrated that Nepotism and cronyism in the workplace, are phenomenon that are basically evaluated negatively. They adversely influences social and economic development, but the impact of COVID-19 pandemic on nepotism and cronyism is not significant.

scholarly journals Damage Evolution of Granodiorite after Heating and Cooling Treatments

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 779
Author(s):  
Mohamed Gomah ◽  
Guichen Li ◽  
Salah Bader ◽  
Mohamed Elkarmoty ◽  
Mohamed Ismael
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Failure Mode ◽  
Physical And Mechanical Properties ◽  
P Wave ◽  
Physical Parameters ◽  
Slow Cooling ◽  
Heating And Cooling ◽  
Natural Rock ◽  
The Impact

The awareness of the impact of high temperatures on rock properties is essential to the design of deep geotechnical applications. The purpose of this research is to assess the influence of heating and cooling treatments on the physical and mechanical properties of Egyptian granodiorite as a degrading factor. The samples were heated to various temperatures (200, 400, 600, and 800 °C) and then cooled at different rates, either slowly cooled in the oven and air or quickly cooled in water. The porosity, water absorption, P-wave velocity, tensile strength, failure mode, and associated microstructural alterations due to thermal effect have been studied. The study revealed that the granodiorite has a slight drop in tensile strength, up to 400 °C, for slow cooling routes and that most of the physical attributes are comparable to natural rock. Despite this, granodiorite thermal deterioration is substantially higher for quick cooling than for slow cooling. Between 400:600 °C is ‘the transitional stage’, where the physical and mechanical characteristics degraded exponentially for all cooling pathways. Independent of the cooling method, the granodiorite showed a ductile failure mode associated with reduced peak tensile strengths. Additionally, the microstructure altered from predominantly intergranular cracking to more trans-granular cracking at 600 °C. The integrity of the granodiorite structure was compromised at 800 °C, the physical parameters deteriorated, and the rock tensile strength was negligible. In this research, the temperatures of 400, 600, and 800 °C were remarked to be typical of three divergent phases of granodiorite mechanical and physical properties evolution. Furthermore, 400 °C could be considered as the threshold limit for Egyptian granodiorite physical and mechanical properties for typical thermal underground applications.

scholarly journals Application of Stereolithographic Custom Models for Studying the Impact of Biofilms and Mineral Precipitation on Fluid Flow

2005 ◽  
Vol 71 (12) ◽  
pp. 8721-8728 ◽  
Author(s):  
D. L. Stoner ◽  
S. M. Watson ◽  
R. D. Stedtfeld ◽  
P. Meakin ◽  
L. K. Griffel ◽  
...  
Keyword(s):  
Biomass Accumulation ◽  
Time Lapse ◽  
Experimental Models ◽  
Microbial Colonization ◽  
Bacillus Pasteurii ◽  
Flow Paths ◽  
Flow Models ◽  
Fracture Apertures ◽  
Internal Configuration ◽  
The Impact

ABSTRACT Here we introduce the use of transparent experimental models fabricated by stereolithography for studying the impacts of biomass accumulation, minerals precipitation, and physical configuration of flow paths on liquid flow in fracture apertures. The internal configuration of the models ranged in complexity from simple geometric shapes to those that incorporate replicated surfaces of natural fractures and computationally derived fracture surfaces. High-resolution digital time-lapse imaging was employed to qualitatively observe the migration of colloidal and soluble dyes through the flow models. In this study, a Sphingomonas sp. and Sporosarcina (Bacillus) pasteurii influenced the fluid dynamics by physically altering flow paths. Microbial colonization and calcite deposition enhanced the stagnant regions adjacent to solid boundaries. Microbial growth and calcite precipitation occurred to a greater extent in areas behind the fabricated obstacles and less in high-velocity orifices.

An Investigation of the Impact of COVID-19 Pandemic on Energy Consumption in the United States

2021 ◽  
Vol 2 (3) ◽  
Author(s):  
Lindsey Kahn ◽  
Hamidreza Najafi
Keyword(s):  
Energy Consumption ◽  
Correlation Coefficient ◽  
Energy Use ◽  
The United States ◽  
Annual Growth Rate ◽  
Total Consumption ◽  
The Usa ◽  
End Use ◽  
The Times ◽  
The Impact

Abstract Lockdown measures and mobility restrictions to combat the spread of COVID-19 have impacted energy consumption patterns. The overall decline of energy use during lockdown restrictions can best be identified through the analysis of energy consumption by source and end-use sectors. Using monthly energy consumption data, the total 9-months use between January and September for the years 2015–2020 is calculated for each end-use sector (transportation, industrial, residential, and commercial). The cumulative consumption within these 9 months of the petroleum, natural gas, biomass, and electricity energy by the various end-use sectors are compared. The analysis shows that the transportation sector experienced the greatest decline (14.38%). To further analyze the impact of COVID-19 on each state within the USA, the consumption of electricity by each state and each end-use sector in the times before and during the pandemic is used to identify the impact of specific lockdown procedures on energy use. The distinction of state-by-state analysis in this study provides a unique metric for consumption forecasting. The average total consumption for each state was found for the years 2015–2019. The total average annual growth rate (AAGR) for 2020 was used to find a correlation coefficient between COVID-19 case and death rate, population density, and lockdown duration. A correlation coefficient was also calculated between the 2020 AAGR for all sectors and AAGR for each individual end-user. The results show that Indiana had the highest percent reduction in consumption of 10.07% while North Dakota had the highest consumption increase of 7.61%. This is likely due to the amount of industrial consumption relative to other sectors in the state.

Data Analysis and Forecast for Aircraft Structure Impact Damage Based on GP Symbolic Fitting Method

2011 ◽  
Vol 217-218 ◽  
pp. 701-705
Author(s):  
Man Yi Hou ◽  
Hui Lin Fan ◽  
Wu Lin Zhu
Keyword(s):  
Impact Damage ◽  
Aircraft Structure ◽  
Matlab Program ◽  
Fitting Method ◽  
Sample Data ◽  
Damage Data ◽  
Impact Parameters ◽  
The Times ◽  
The Impact ◽  
Fitting Model

In order to research the aircraft impact damage, one symbolic fitting method for analyzing and forecasting the damage data is proposed based on genetic programming (GP). The method can be used to forecast the impact damage by recognizing the rule in some groups of actual data including impact parameters and damage hole size. The principle of GP symbolic fitting method is briefly introduced. The fitting model is created with some sample data respectively for training and testing from Sorenson experiential equation. The computation with Matlab program indicates the model has a good performance to fit and forecast the damage data with avoiding the noise. The application of GP symbolic fitting method can help to decrease the times of fire experiments. Since the method can recognize the complicated nonlinear relationship between the impact parameters and damage data, it is more applicable than theoretical analysis and experiential equation to forecast the aircraft impact damage.

scholarly journals Designing Wayang Kulit Purwa with Gatotkaca as the Character in Game

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Nunnun Bonafix
Keyword(s):  
Digital Media ◽  
Rapid Development ◽  
Modern Society ◽  
Young Generation ◽  
Experience Design ◽  
Solid Foundation ◽  
The Times ◽  
Wayang Kulit ◽  
The Impact ◽  
Modern Era

Young generation nowadays has lack of knowledge on the culture of shadow puppet (wayang kulit) which is a heritage that has a high value of art and philosophy. This is caused by the impact of foreign cultures rapidly entering Indonesia. The rapid development of the information technology through internet & game has led to globalization that seems to be not limited to space and time. The speed of information and foreign cultures cannot be stopped. The culture of shadow puppet (wayang kulit) is getting eroded and is not much known by the modern society nowadays. This is an irony to a big nation which has a rich heritage, so it is our obligation as a citizen to maintain and preserve it. Based on the formulae of AIGA 2015 that defines (time + content + context) / time = experience design, the game of wayang kulit (shadow puppet) Gatotkaca put forbattled different experience to users in exploring the information and entertainment in those media. Having the spirit of moderate Postmodernism, the design plan called User Interface which combines the modern and classic traditional elements will encourage new experience to the users (Experience Design). The design recognizes times and trends, and it keeps changing as the development of the times. The design can be a pace setter to next individuals who are called to maintain and preserve national cultures, in general, and wayang kulit purwa, in particular, through digital media. The development in the modern era will not change the identity of shadow puppet (wayang kulit) culture since it has solid foundation.

scholarly journals E-Learning in Dental Schools in the Times of COVID-19: A Review and Analysis of an Educational Resource in Times of the COVID-19 Pandemic

2020 ◽  
pp. 207-224
Author(s):  
Daniel Chavarría-Bolaños ◽  
Adrián Gómez-Fernández ◽  
Carmen Dittel-Jiménez ◽  
Mauricio Montero-Aguilar
Keyword(s):  
Learning Strategies ◽  
Learning Experience ◽  
Negative Consequences ◽  
Teachers And Students ◽  
Academic Courses ◽  
E Learning ◽  
The Times ◽  
Teaching Learning ◽  
Dental Schools ◽  
The Impact

While countries are facing different stages in their COVID-19 infection rates, worldwide there are millions of students affected by universities’ facilities closures due to the pandemic. Some institutions have enforced strategies to transfer some courses to a virtual modality, but many Dental Schools have been challenged to deal with a situation which requires emergency measures to continue the academic course in the middle of lock-downs and social distancing measures. Despite the fact that the number of online academic programs available, especially graduate programs, has increased in diverse modalities, this pandemic forced e-learning processes to develop abruptly. The likelihood of using e-learning strategies in dentistry was substantiated in the scientific literature and an overview of these opportunities is presented. Additionally, the experience of the University of Costa Rica Faculty of Dentistry is presented, as it was evident that some of the key elements in a e-learning environment needed a quick enhancement and initiation of some processes was required. First, it was necessary to categorize the academic courses depending on their virtualization's possibility (curricula analysis and classification), to better understand the extent of the impact and the work needed to contain, as far as the possibilities allowed, negative consequences on students learning process. Second, teachers needed further training in the application of virtual strategies which they hadn’t used before. do Third, an evaluation of the students’ conditions and needs was conducted in a form of a survey. Finally, teachers and students activated the available virtual platforms. For many Dental Schools, this virtualization process is an ongoing progress although it was abruptly imposed, but this moment indeed represents an enormous opportunity to move forward and get immerse in the virtualization environment as a teaching/learning experience.

scholarly journals WADAH KOMUNITAS DAN REKREASI SEBAGAI RUANG KE - 3 DENGAN URBAN AKUPUNTUR METODE MENGHIDUPKAN DAN MENGEMBALIKAN CITRA PASAR BARU

2020 ◽  
Vol 2 (2) ◽  
pp. 1427
Author(s):  
Stephen Stephen ◽  
Franky Liauw
Keyword(s):  
Shopping Center ◽  
Small Scale ◽  
Urban Spatial Structure ◽  
Social Culture ◽  
Shopping Area ◽  
The World ◽  
To Come ◽  
The Times ◽  
The Impact ◽  
The City

At present the activity of buying and selling/trading has been developing rapidly for decades. The growth of new malls spread throughout Jakarta. Making Jakarta the city with the largest and most shopping center in the world, with more than 173 malls. Coupled with the help of technology, an online shop platform has emerged that makes it easy for visitors to shop without having to come to the store. With the help of electronic media tools such as tablets or Smartphones. Nowadays, malls are not only a place to shop but also a place for recreation, socializing, or just for a walk alone. The progress of technology and human culture is changing. It's one of the factors that influence the impact of the decline in visitors at the old shopping center, every year such as a Pasar Baru shopping center. Re-Imagine Pasar Baru is a project that aims as a motor/propeller for Pasar Baru Community. Inviting the local people and Shop Owners to take part in making a change. Through a new program that strengthens unity and diversity to bring the conciseness cooperation (Gotong-royong) attitude that has been lost with the development of the times. Creating a place where people can socialize and interact, get closer, get to know each other, and also as a means of recreation for residents, visitors, shop owners, and also this project hopes to bring the Pasar Baru shopping area to life. Through the Urban Acupuncture method by analyzing the needs, potentials, deficiencies, demographics, ecology, etc. that characterize the Pasar Baru area. Where it can present a new program, and produce small-scale changes, but social catalytic intervention into the urban spatial structure. In physical and social-culture in Pasar Baru. Keywords: Community; Gotong Royong; Pasar Baru; Recreation; Urban Acupuncture  AbstrakSaat ini aktivitas Jual-beli/perdagangan sudah berkembang pesat selama beberapa dekade. Tumbuhnya mall-mall baru tersebar di seluruh Jakarta. Menjadikan Jakarta sebagai kota dengan pusat perbelanjaan terbanyak dan terbesar di dunia, dengan lebih dari 173 mall. Ditambah dengan bantuan teknologi, platform online shop memudahkan pengunjung untuk berbelanja tanpa perlu datang ke toko. Dengan bantuan alat media elektronik seperti tablet atau Smartphones. Saat ini, mall bukan hanya menjadi tempat untuk berbelanja melainkan menjadi tempat rekreasi, bersosialisasi, atau hanya sekedar untuk jalan-jalan semata. Kemajuan teknologi serta budaya manusia yang berubah, merupakan salah satu faktor yang berpengaruh terhadap dampak penurunan pengunjung di pusat perbelanjaan lama setiap tahunnya, seperti pusat perbelanjaan Pasar Baru. Re-Imagine Pasar Baru Merupakan proyek yang bertujuan sebagai motor / pengerak daerah Pasar Baru. Mengajak masyarakat dan para pedagang untuk ikut andil dalam melakukan suatu perubahan. Lewat program yang mempererat kesatuan dan persatuan guna memunculkan sikap gotong royong yang sudah hilang seiring berkembangnya zaman. Menciptakan tempat dimana warga dapat bersosialisasi dan berinteraksi, mendekatkan, saling mengenal satu sama lain dan juga sebagai sarana rekreasi warga lokal, dan proyek ini berharap dapat menghidupkan kawasan perbelanjaan Pasar Baru. Lewat metode Urban Acupunture yaitu dengan menganalisis kebutuhan, potensi, kekurangan, demografi, ekologi yang menjadi ciri khas dari kawasan Pasar Baru. Dimana dapat menghadirkan suatu program baru, dan menghasilkan perubahan skala kecil, tetapi intervensi katalitik sosial ke dalam tatanan ruang kota. Bukan hanya sekedar bentuk fisik, tetapi juga berdampak pada sosial dan budaya Kawasan Pasar Baru sendiri. 

PERANCANGAN KOMUNIKASI VISUAL PROMOSI KERAJINAN LAKER PALEMBANG

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Galang Sabillah Bahar
Keyword(s):  
Daily Life ◽  
Modern Technology ◽  
Cultural Elements ◽  
Visual Communication Design ◽  
The People ◽  
Younger Generation ◽  
The Times ◽  
The Impact ◽  
The City ◽  
Modern Era

<p><em>Laker is a typical Palembang handicraft in the form of all products or household utensils made of wood, rattan, bamboo or whatever is painted with black ink and then coated with varnish as an ingredient to beautify it as well as preservative. In this modern era the use of Crafts Laker in palembang is increasingly fading and it's not longer a culture in the City of palembang, especially the younger generation. The lack of promotion carried out on Laker handicrafts has made many of today's young generations not too familiar with Laker crafts, not even a few of them don’t know at all what laker craft is. Moreover, in the current development era, there is a fear of changing cultural heritage forms as a result of the impact of the development and progress of modern technology and other cultural elements that come from outside. To avoid this, visual promotion efforts are needed to the people of Palembang. This promotion was carried out to be able to invite the people of Palembang to cultivate laker crafts in daily life,especially the younger generation. Therefore the Visual Communication Design, Promotion of Laker Crafts is a form of persuasive effort to the people of Palembang, especially to get to know the Laker Crafts so that they can instill a sense of love and pride in Palembang Laker crafts that are known to the Palembang youth, and can invite Palembang people, especially the younger generation cultivate Laker crafts in daily life along with the trends of the times.</em></p>

An Analysis of the Effect of selected Factors on microsurgical Performance

2021 ◽  
Author(s):  
Andrzej Zyluk ◽  
Konrad Czernikiewicz ◽  
Joanna Antoniak ◽  
Urszula Abramczyk
Keyword(s):  
Physical Exercise ◽  
Medical Studies ◽  
Latex Glove ◽  
Physical Exercises ◽  
Surgical Expertise ◽  
Negative Effect ◽  
The Times ◽  
The Impact ◽  
Positive Effect

Abstract Background Microsurgery is a specific surgical expertise that involves operating on very small structures, and requires the assistance of a magnifying device: a microscope or loupes. Several factors have been identified that could affect the quality of microsurgical performance in training or surgical procedures. Objective The objective of this study was to assess the impact of the selected factors – caffeine, alcohol and physical exercise – on a microsurgical task prior its performance. Methods Ten students from the 5th and 6th years of medical studies who had completed the advanced microsurgical course performed a “6-stitches test” on a latex glove spanned over a cup prior to and after consumption of caffeine, alcohol and performing physical exercises. The times taken to complete the task at baseline and post-exposure were recorded. Results The results of the study show a statistically significant positive effect of caffeine and a statistically significant negative effect of physical exercise on microsurgical performance when performed shortly before the task. Small dose of alcohol taken before the task showed had little effect on performance.

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