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2022 ◽  
Author(s):  
Florian Feppon ◽  
Pierre Lermusiaux

Abstract. This paper focuses on the extractions of Lagrangian Coherent Sets from realistic velocity fields obtained from ocean data and simulations, each of which can be highly resolved and non volume-preserving. We introduce two novel methods for computing two formulations of such sets. First, we propose a new “diffeomorphism-based” criterion to extract “rigid sets”, defined as sets over which the flow map acts approximately as a rigid transformation. Second, we develop a matrix-free methodology that provides a simple and efficient framework to compute “coherent sets” with operator methods. Both new methods and their resulting rigid sets and coherent sets are illustrated and compared using three numerically simulated flow examples, including a high-resolution realistic, submesoscale to large-scale dynamic ocean current field in the Palau Island region of the western Pacific Ocean.


2021 ◽  
Vol 8 ◽  
Author(s):  
Siyuan Ma ◽  
Junyu Yan ◽  
Lu Chen ◽  
Yingqi Zhu ◽  
Kaitong Chen ◽  
...  

Background: Recent research has suggested that cardiac regeneration may have the widely applicable potential of treating heart failure (HF). A comprehensive understanding of the development status of this field is conducive to its development. However, no bibliometric analysis has summarized this field properly. We aimed to analyze cardiac regeneration-related literature over 20 years and provide valuable insights.Methods: Publications were collected from the Web of Science Core Collection (WoSCC). Microsoft Excel, VOSviewer, CiteSpace, and alluvial generator were used to analyze and present the data.Results: The collected 11,700 publications showed an annually increasing trend. The United States and Harvard University were the leading force among all the countries and institutions. The majority of articles were published in Circulation Research, and Circulation was the most co-cited journal. According to co-citation analysis, burst detection and alluvial flow map, cardiomyocyte proliferation, stem cells, such as first-and second-generation, extracellular vesicles especially exosomes, direct cardiac reprogramming, macrophages, microRNAs, and inflammation have become more and more popular recently.Conclusions: Cardiac regeneration remains a research hotspot and develops rapidly. How to modify cardiac regeneration endogenously and exogenously may still be the hotspot in the future and should be discussed more deeply.


2021 ◽  
Vol 11 (2) ◽  
pp. 92-107
Author(s):  
Aldino Rizki Prayoga ◽  
Meizul Zuki ◽  
Yusril Dany

PT Mitra Kerinci is a company established in West Sumatra Province which is engaged in tea plantations and tea processing in its factories. PT Mitra Kerinci produces an average of 7,000 kg or 7 tons of green tea shoots per day. The production process for processing tea shoots, the factory sometimes does not reach the production target in accordance with the production target of the company. The goal of research  to determine the amount of the contribution of the motion study to the standard time and determine the amount of the contribution of the standard time to the increase in productivity in the final drying process at Ball Tea station, the production of tea shoots at PT. Kerinci Partners. This research an experimental research type and uses the same subject research design (treatment by subject design), namely the treatment is imposed on the same subject. The results of time calculations after the motion study on the process flow map reached 15,676.02 seconds. Then proceed with the calculation of the cycle time which reaches 825.41 seconds with the actual standard deviation obtained at 3.58 and the standard deviation of the subgroup distribution is 1.79. After knowing the results of the average cycle time, the actual standard deviation and the standard deviation of the subgroup distribution, the data uniformity test was continued, starting with calculating the BKA and BKB. The BKA calculation results obtained 830.78 and the BKB reached 820.04. So that in the data uniformity test the results reached 0.908. In the series of movements of the left and right hands after the repair, a cycle time of 825.41 seconds / unit of Ball Tea was obtained from the previous time, reaching 906.66 units / Ball Tea and getting a time difference of 81.25 seconds. In the calculation of the standard time, the normal time calculation is carried out first, after it is known that the result of the adjustment calculation reaches 1.12 so that the normal time is obtained with a total of 924.45 seconds. Continue to calculate the standard time and the results reach 1423.65 seconds with an allowance of 54%. This contributed to an increase in productivity by 5.7%.


Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1466
Author(s):  
Jana Sonnenschein ◽  
Pascal Friedrich ◽  
Moloud Aghayarzadeh ◽  
Otto Mierka ◽  
Stefan Turek ◽  
...  

The Archimedes Tube Crystallizer (ATC) is a small-scale coiled tubular crystallizer operated with air-segmented flow. As individual liquid segments are moved through the apparatus by rotation, the ATC operates as a pump. Thus, the ATC overcomes pressure drop limitations of other continuous crystallizers, allowing for longer residence times and crystal growth phases. Understanding continuous crystallizer phenomena is the basis for a well-designed crystallization process, especially for small-scale applications in the pharmaceutical and fine chemical industry. Hydrodynamics and suspension behavior, for example, affect agglomeration, breakage, attrition, and ultimately crystallizer blockage. In practice, however, it is time-consuming to investigate these phenomena experimentally for each new material system. In this contribution, a flow map is developed in five steps through a combination of experiments, CFD simulations, and dimensionless numbers. Accordingly, operating parameters can be specified depending on ATC design and material system used, where suspension behavior is suitable for high-quality crystalline products.


2021 ◽  
Vol 8 (6) ◽  
pp. 1127
Author(s):  
Wahyudi Agustiono ◽  
Intan Rofika Putri ◽  
Devie Rosa Anamisa

<p class="Abstrak">Pelayanan dokumen resmi melalui media internet atau e-surat mulai diadopsi pemerintah karena lebih sederhana, cepat, murah dan aman. Penerapan e-surat ini akan sangat berguna terutama bagi Desa Waru Barat, Kabupaten Pamekasan, Madura yang sebagian warganya berdomisili di luar kota atau bahkan di luar negeri. Para warga desa ini seringkali membutuhkan pelayanan surat untuk berbagai keperluan administrasi tanpa terkendala perbedaan waktu dan jarak. Sementara itu, Pemerintah Desa juga ingin meningkatkan pelayanan surat menyurat kepada warganya secara efisien namun tetap menjaga keamanan dan keabsahan dokumen. Oleh karena itu, penelitian ini bertujuan merancang dan membangun aplikasi e-surat untuk Desa Waru Barat dengan menggunakan QR Code. Hasil evaluasi fungsionalitas menunjukkan bahawa aplikasi berhasil membuat dokumen surat dengan QR Code yang unik untuk menjaga keamanan dan keabsahan setiap surat. Sementara itu hasil user acceptance testing dengan melibatkan perangkat desa dan warga masyarakat sebagai pengguna utama menunjukkan tingkat dayaguna dan penerimaan sangat tinggi masing-masing 97,2% dan 95,6%. Dari hasil di atas, dapat disimpulkan bahwa penerapan aplikasi e-surat ini terbukti sangat berguna bagi pemerintah dan warga desa terutama yang berdomisili di luar desa. Berdasarkan hasil evaluasi flowmap menunjukan bahwa implementasi e-surat terbukti dapat membuat proses administrasi surat menyurat lebih sederhana, cepat, menghilangkan kendala jarak dan menghemat sumber daya (biaya, waktu dan utilitas) dibandingkan dengan proses sebelum adanya aplikasi ini. Selain implikasi praktis di atas, kontribusi penelitian ini khsusnya dalam bidang TI, yang dapat diadopsi penelitian masa depan, adalah arsitektur sistem dan aplikasi e-Surat dengan algoritma yang mampu membangkitkan QR Code yang unik untuk menjaga keamanan dan keabsahan dokumen.</p><p class="Abstrak"><strong><em><br /></em></strong></p><p class="Abstrak"><strong><em>Abstract</em></strong></p><p class="Judul2"><em>The process of providing certificates using internet to the citizens, known as e-certificate has increased. This is because e-certificate offers streamlined and faster process yet secure. Therefore, e-certificate seems to be useful especially for Waru Barat Village authority, Pamekasan District, Madura, whose people mostly work outside or even overseas. Eventually, they often need to obtain certificates from the authority for various purposes. On the other hand, the authority is keen to speeding up the delivery of the document but still pay attention to the validity and security. Therefore, this research attempted to design and develop e-certificate for Waru Barat Village using QR Code. The functionality testing showed the application successfully generated e-certificate along with the unique QR Code to secure and maintain the validity of the document. The user acceptance testing involving village staffs and people as the primary users indicated the overall score are 97.2% and 95.6% respectively. This implies that the application proofed to be useful and usable according to the staffs and especially to those who live outside the village. Another flow-map evaluation also showed that the implementation of e-certificate was able to make the administrative process more streamlined, faster, remove geographical barrier, save the resources (cost, time and utility). Despite these practical implication, the contribution of this research, especially to the IT discipline which could be adopted in the future study, is the system architecture and e-certificate application along with the algorithm for generating unique QR Code to ensure the security and validity of the document.           </em></p><p class="Abstrak"><strong><em><br /></em></strong></p><p class="Abstrak"><strong><em><br /></em></strong></p>


2021 ◽  
pp. 014459872110506
Author(s):  
Feng Liu ◽  
Guiling Wang ◽  
Wei Zhang ◽  
Yizuo Shi ◽  
Chen Yue ◽  
...  

Geothermal resources as clean and renewable energy can be utilized for agriculture, tourism, and industry. The assessment of geothermal potential and the study of genetic mechanism of the geothermal system is an essential part of geothermal resource development. In this study, 16 steady-state temperature logs are obtained in the mountainous area on the northern margin of North China. Thermal conductivity and heat production rates are tested or collected from more than 200 rock samples of these wells and outcrops around the study area. Based on these data, for the first time, the detailed delineations of temperature distributions, genetic mechanisms of geothermal systems, and resource potential of Hot Dry Rock in the study area are achieved. The heat flow map indicates a low heat flow state with an average value of 53.1 mW/m2 in the study area, which is lower than the average value of 62.5 mW/m2 in mainland China. The distribution of hot springs in the area is mainly controlled by fault systems. Heat flow only exhibits a minor effect on the temperature of hot springs and geothermal wells. On this basis, the deep temperature distribution within 3–10 km depths of the study area is calculated using the one-dimensional steady-state heat conduction equation. With it, the reservoir depths of hot springs are estimated to be 3–5 km with temperatures ranging from 70°C to 110°C. Furthermore, a conceptual model for the geothermal system in the study area is derived. According to the results, Northeastern Chengde and northern Beijing exhibit the highest temperatures at all depths. Similar patterns are observed in the temperature distribution maps and the heat flow map, which suggest that the deep temperature distribution is mainly controlled by regional heat flow. With the depth increases, the temperature shows larger variation at each depth level, which is possibly caused by the heterogeneity of crustal composition. According to our resource assessment by volumetric method, the exploitable potential of Hot Dry Rock within the depth of 7–10 km of the study area is equivalent to about 3.1 × 1011 tons of standard coal, but the barrier is still existing for development under the current technical and economic conditions.


SPE Journal ◽  
2021 ◽  
pp. 1-20
Author(s):  
Luigi Raimondi

Summary In this paper, I present numerical results of gas/liquid flows in pipelines obtained from a new simulation code. One difference, with respect to other 1D fluid dynamic commercial simulation products, is the use of a compositional approach to the problem: This is rarely found in published articles about gas/liquid flow in the oil and gas industry. It is shown that the algorithm can calculate both pressure and material fast waves generated during the transportation of gas and liquid in pipes. The solution algorithm is based on the application of a two-fluid model to the mass, momentum, and energy conservation equations, which are solved using a mixed implicit-explicit integration schema. Closure equations for the calculation of interface stress are taken from literature articles. A dam-break simulation (i.e., a Riemann initial value problem) is presented as a severe test case for validation of the two-phase flow algorithm. Because the code is able to capture sharp and fast changes in the liquid holdup connected to the formation of pressure waves, it is applied to the simulation of slug flow without the use of steady-state “unit cell” models and slug tracking functions. In this context, the experimental results on pseudoslug formation in inclined pipes at high pressures, published by the Tulsa University Fluid Flow Project (TUFFP), are used to compare simulated results with experimental data. The last part is dedicated to the simulation of some cases taken from a classical flow-map of a fundamental article by Taitel and Dukler (1976). At constant liquid superficial velocity, the formation of liquid slugs and their subsequent termination with the increase of gas flow rate is simulated with details never previously presented.


2021 ◽  
Vol 33 (10) ◽  
pp. 101902
Author(s):  
Li-Ming Chao ◽  
Md. Mahbub Alam ◽  
Chunning Ji ◽  
Hanfeng Wang
Keyword(s):  

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6103
Author(s):  
Jacek Majorowicz

Heat flow patterns variability related to the age of the consolidated, and differences in, sedimentary thickness of the sedimentary succession are important constraints upon the thermal state of the sedimentary fill and its geothermal energy potential. Heat flow in the Permian basin of central Europe varies from a low of 40 mWm−2 in the Precambrian Platform to 80 mWm−2 in the Paleozoic basement platform influencing temperature for geothermal potential drilling depth. Continuity of thermal patterns and compatibility of heat flow Q across the Permian basin across the Polish–German basin was known from heat flow data ever since the first heat flow map of Europe in 1979. Both Polish and German heat flow determinations used lab-measured thermal conductivity on cores. This is not the case for the recent heat flow map of Poland published in 2009 widely referenced in Polish geological literature. Significant differences in heat flow magnitude exist between many historical heat flow maps of Poland over the 1970s–1990s and recent 21st century patterns. We find that the differences in heat flow values of some 20–30 mWm−2 in Western Poland exist between heat flow maps using thermal conductivity models using well log interpreted mineral and porosity content and assigned world averages of rock and fluid thermal conductivity versus those measured on cores. These differences in heat flow are discussed in the context of resulting mantle heat flow and the Lithosphere-Asthenosphere Boundary depth modelled differences and possible overestimates of deep thermal conditions for enhanced geothermal energy prospects in Poland.


2021 ◽  
Vol 19 (1) ◽  
pp. 110-134
Author(s):  
A. P. Tyapukhin ◽  
M. Yu. Kolovertnova

Achieving the goals of enterprises and their survival in market conditions is achieved through implementation of supply chain management concepts, values, and demands focused on managing resource flows to create and deliver value to their end users.The subject of the research is relationship between consumers and suppliers as links in the supply chain that form and transform flows of values, demands, products and/or services, as well as novelty in a competitive environment.The objectives of the research are to clarify and supplement the theory and methodology of managing flows of values, demands, products and/ or services, as well as novelties while introducing and implementing management concepts for linearly ordered enterprises or chains.The tasks of the research are to clarify interrelationship of objects, management components, and types of flows; to identify the roles of the consumer and supplier as sources of flows in supply chains; to develop classification of flows considering the objects of the concepts of chain management; to create a form of a flow map regarding flows in supply chains.Research has used the methods of classification, analysis and synthesis, induction, and deduction, and the tools of binary matrices developed based on relevant qualitative characteristics of the objects under the study.The results of the research make it possible to clarify and supplement provisions regarding supply, value and demand chain management based on a systematic approach; to develop practical recommendations to reduce lost profits when managing flows in supply chains; to create prerequisites for more efficient value creation and its supply.


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