Journal articles on the topic 'Current cold demand'
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1
Li, YanMin, HaiFei Lin, and ZhenDong Yang. "The effect of magnetic field on freezing point of water." Journal of Physics: Conference Series 2194, no. 1 (February 1, 2022): 012034. http://dx.doi.org/10.1088/1742-6596/2194/1/012034.
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Abstract Cold storage technology can realize energy storage and release according to demand and balance the power grid by “shifting peak and filling valley”. Ice cold storage system has the outstanding advantages of large cold storage density and simple system, and is the frontier direction of current cold storage technology research and application. However, there are some problems such as low phase transition temperature of cold storage medium and high energy consumption under cold storage condition. The research shows that magnetic field can increase the freezing point of water and aqueous solution by about 3.0-5.0K, which is beneficial to further increase the economic benefit and save energy in refrigeration condition based on the refrigeration demand.
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Manan, A., B. Shahid, A. Sultan, and U. I. Ahmed. "Consumer Demand for Beverages in Pakistan." Cercetari Agronomice in Moldova 50, no. 2 (June 1, 2017): 109–20. http://dx.doi.org/10.1515/cerce-2017-0020.
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AbstractThis current research endeavors to study important factors having significant impact on consumer’s choice of beverages in Punjab province of Pakistan. Beverages in two major categories of ‘hot’ and ‘cold’ have been studied to examine consumer consumption pattern. Data has been collected through interview from 80 respondents belonging to two major cities of Punjab, i.e. Lahore and Faisalabad, by incorporating stratified random sampling technique. These two cities of Punjab were selected because of big departmental stores opening like Metro Cash and Carry store, Al-Fateh and others. A pre tested and well-arranged questionnaire was used for data gathering from respondents. To estimate the outcome of factors affecting choices of consumers (demand function), multivariate analysis was incorporated. Results of this research showed that consumption pattern of cold beverages was affected significantly by consumer income, cold beverages prices, city selected for survey and number of adolescents in a family, whereas factors which affected the consumption of hot beverages were food expenditure, living area, marital status, income, working persons in a family, family size. Due to availability of copious brands of beverages, consumption is escalating with the passage of time and consumers are eager to pay but owing to high rates they are not relishing full taste of beverages. So, local industry should produce cost effective and quality drinks to enhance usage.
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Lin, Hui Dan, and Geng Jun Gao. "Transportation Safety Countermeasure Analysis on Cold-Chain Logistics of Fresh Agricultural Products." Advanced Materials Research 860-863 (December 2013): 3123–27. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.3123.
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With the development of cold-chain logistics technology, much more cold-chain demand for fresh agriculture products is becoming needed. This paper studies the current development status of cold-chain logistics of fresh agriculture products in China and proposes methods and strategies on how to ensure fresh agriculture products safety and quality in cold-chain transportation problems combining China's existing situation aimed at promoting cold-chain logistics of fresh agriculture products in China with greater competitiveness in the world.
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Masudin, Ilyas, and Nika Tampi Safitri. "Food Cold Chain in Indonesia during the Covid-19 Pandemic: A Current Situation and Mitigation." Jurnal Rekayasa Sistem Industri 9, no. 2 (July 27, 2020): 99–106. http://dx.doi.org/10.26593/jrsi.v9i2.3981.99-106.
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The spread of the corona virus (COVID-19) has had a massive impact on all business sectors in Indonesia. Food cold supply chain is a business sector that is quite badly affected. This is because the food cold chain requires special treatment to maintain its quality, has a relatively short life and cannot be returned. This article discusses the impact of the COVID-19 pandemic and its social impacts such as social restrictions and area lockdown on the business of food cold chain. It also discusses mitigation that needs to be done to anticipate related issues such as food supply-demand, food safety and some transportation challenges
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Трушляков, Євген Іванович, Андрій Миколайович Радченко, Микола Іванович Радченко, Ян Зонмін, Анатолій Анатолійович Зубарєв, and Веніамін Сергійович Ткаченко. "ХОЛОДОПРОДУКТИВНІСТЬ СИСТЕМИ КОНДИЦІЮВАННЯ ЗОВНІШНЬОГО ПОВІТРЯ ЗА ПОТОЧНИМ ТЕПЛОВИМ НАВАНТАЖЕННЯМ." Aerospace technic and technology, no. 2 (April 22, 2019): 51–55. http://dx.doi.org/10.32620/aktt.2019.2.06.
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The efficiency of the outdoor air conditioning systems application depends on how full the installed cooling capacity is applied, that is, with a more complete load and for as long as the possible yearly duration in actual climatic conditions. The production of cold is taken as a criteria of a quantitative evaluation of the efficiency of applying the cooling capacity of air conditioning systems – the amount of cold produced in accordance with its current demand for air conditioning, which in turn depends on the current consumption of cooling capacity and its duration and equals to their multiplication. It is obvious that the maximum value of the current amount of cold produced/consumed indicates an effective application of the installed cooling capacity. However, since the current demands of cooling capacity and their duration, that is, the amount of cold produced/consumed, depending on the changing current climatic conditions, they are characterized by significant fluctuations, which makes it difficult to choose the installed cooling capacity of the air conditioning system. Obviously, if we determine the amount of cold produced/consumed by its current values and summarized during the year, it is possible to significantly simplify the choice of the installed cooling capacity. At the same time, the current amount of cold produced/consumed causes a change in the rate of increment of the annual cold production with a change in the installed cooling capacity, and the maximum rate corresponds to the installed cooling capacity, which provides its efficient use. Proceeding from a different rate of increment of annual cold production with an increase in the installed cooling capacity of the air conditioning system due to a change in heat load in accordance with current climatic conditions during the year, the value of design heat load on the air conditioning system (installed cooling capacity) that provides maximum or close to it the rate of increment of the annual production of cold, and hence the maximum efficient use of installed cooling capacity is chosen
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Boesten, Stef, Wilfried Ivens, Stefan C. Dekker, and Herman Eijdems. "5th generation district heating and cooling systems as a solution for renewable urban thermal energy supply." Advances in Geosciences 49 (September 20, 2019): 129–36. http://dx.doi.org/10.5194/adgeo-49-129-2019.
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Abstract. In order to reduce greenhouse gas emissions and decrease dependency on depleting fossil fuel resources the shift to a renewable energy system is necessary. District heating and cooling systems are a viable solution to provide heat and cold in urban environments. Renewable heat and cold sources that may get incorporated in future urban energy systems will not provide the same high temperature output as current fossil fuel fired systems. Fifth generation district heating and cooling (5GDHC) systems are decentralized, bi-directional, close to ground temperature networks that use direct exchange of warm and cold return flows and thermal storage to balance thermal demand as much as possible. 5GDHC offers a way to incorporate low temperature renewable heat sources including shallow geothermal energy, as well as reduce total demand by recuperating generated heat from cooling and generated cold from heating. The large scale of 5GDHC allows for optimal design of technical parts like heat pumps and thermal storage vessels, while increasing overall system efficiency by incorporating a large variety of supply and demand profiles. We provide a definition for 5GDHC and show how this concept differs from conventional district heating systems. The Mijnwater system in Heerlen, the Netherlands is showing what a city-level 5GDHC system can look like.
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Alnuaimi, Abdulla, and Sukumar Natarajan. "EXTREME COLD DISCOMFORT IN EXTREME HOT CLIMATES, A STUDY OF BUILDING OVERCOOLING IN OFFICE BUILDINGS IN QATAR." Journal of Engineering Research [TJER] 18, no. 2 (February 13, 2022): 101–13. http://dx.doi.org/10.53540/tjer.vol18iss2pp101-113.
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Indoor cold discomfort in Qatar due to “building overcooling” is increasing, as air-conditioning prevails, and global temperatures rise. Overcooling is not dependent only on the inappropriate design of cooling systems, but on “international” thermal comfort standards that are not customized for warm climates. International standards are unintentionally biased towards cooler climates and cultures, the application of which in warm climates result in colder indoor temperatures observed by building occupants and increased cooling energy demand. Overcooling is an over-expenditure of energy, resulting in uncomfortably cold indoor thermal conditions, and unnecessary carbon emissions. In this study, the analysis of field data from 6 office buildings in Doha in a range of indoor thermal conditions and investigation of overcooling on occupant comfort and building performance is conducted. The analysis uncovers over 35% of occupants state being uncomfortably cold and a consensus across the surveys highlight comfortable temperatures higher by 2°C from current setpoint temperatures. Greater occupant comfort and energy efficiency are found by increasing the indoor temperature setpoints investigated through thermal comfort analysis and energy simulation models. Around 50% decrease in occupant discomfort and a 15% decrease in cooling energy demand is found. Such an adjustment in Qatar would improve occupant comfort levels and reduce cooling energy demand throughout the existing office building stock.
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Fang, Peng, Cui Mao, Yuping Chen, Shan Zhou, Rui You, and Danning Xu. "Multi-time scale optimization scheduling of integrated energy system considering demand side response." E3S Web of Conferences 213 (2020): 02038. http://dx.doi.org/10.1051/e3sconf/202021302038.
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As the physical carrier of the energy Internet, the integrated energy system has become the focus of current research. Considering the renewable energy and demand side load fluctuations, using the price type and the alternative demand side response characteristics, a day-ahead and intraday optimization scheduling model that takes into account the demand side response is established, in which the intraday, according to the difference of electricity, cold/heat and natural gas scheduling time, a three-layer rolling optimization scheduling model is proposed. The example analysis shows that this model can suppress the fluctuation of renewable energy and load in the day, improve the stability of the system, and further reduce the operating cost of the system.
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Dumančić, Marko. "Spectrums of Oppression: Gender and Sexuality during the Cold War." Journal of Cold War Studies 16, no. 3 (July 2014): 190–204. http://dx.doi.org/10.1162/jcws_a_00473.
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This article reviews the scholarship on Cold War sexuality issues prior to the 1969 Stonewall riots, paying particular attention to recent books by Robert J. Corber, Michael S. Sherry, and Jennifer V. Evans. The Cold War in the West affected both the lived and the discursive realities of sexual minorities in a paradoxical way. On the one hand, anxieties about the superpower rivalry facilitated regulatory frameworks and social demarcation lines that profoundly circumscribed the agency of lesbian, gay, bisexual, and transgender groups and individuals. On the other hand, these borders and regulatory systems often backfired, subverted their intended function, or simply produced unintended consequences. Although repression of non-normative sexual and gender identities remained a fact of life during the first two-and-a half decades of the Cold War, it does not reveal the totality of the Cold War experience. The current research on Cold War sexualities demonstrates that Cold War culture can thus be best understood as a complex system in which fissures and breaks were as salient as the demand for uniformity and control.
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Crist, Ernie, Birendra Jena, Michael Jacques, Matt Dahar, Don Li, and Fusheng Sun. "Advancement of Plasma Cold-Hearth Melting for Production of Gamma Titanium Aluminide Alloys within Arconic." MATEC Web of Conferences 321 (2020): 08008. http://dx.doi.org/10.1051/matecconf/202032108008.
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Utilization of gamma titanium aluminide alloys in aerospace and automotive/industrial applications has placed significant demand on melting sources for products to be used in cast, wrought, and direct-machining applications. There is also an increased demand for input stock used in gas atomization of powders. Current technologies used in ingot manufacturing include plasma arc melting, vacuum arc melting, and induction skull melting + centrifugal casting. Subsequent processing may include forging, re-melting + casting, or machining directly into components. Over the past six years, Arconic Engineered Structures has developed a robust melting method using plasma cold-hearth melting technology, including the design and implementation of a new 3-torch system to produce Ti-48-2-2 cast bars. General discussions concerning plasma cold-hearth melting, manufacturing challenges, and metallurgical attributes associated with cast Ti-48-2-2 bars will be reviewed. Emphasis will be on understanding the impact of hot isostatic pressing on internal voids, residual stress cracking and resulting mechanical properties.
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Karni, Eyal. "Retractable Spatial Structures for Swimming Pool Enclosures." International Journal of Space Structures 10, no. 4 (December 1995): 231–36. http://dx.doi.org/10.1177/026635119501000405.
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Retractable spatial structures are modern buildings designed to comply with the user's flexibility needs – concerning the complete or partial opening of a building's enclosure. Most sport activities are usually preferred, by spectators as well as by competitors, to be held in open air. Swimming, a popular sport activity, is highly sensitive to cold and wind. The need for retractable structures arises since weather conditions vary with seasons while current market demand is for year-round activity. Designing retractable enclosures for swimming pools involves specific criteria, resulting from the safety and operational demands of such facilities. The variety of swimming pool geometries and the nature of the user's needs has resulted in numerous solutions of retractable enclosures, varying in size, geometry, structural systems, building technology, opening and closing techniques, building materials, maintenance and cost. This paper addresses current solutions of light-weight retractable spatial structures – designed to enclose swimming pool facilities. Swimming pool types are described, followed by a list of design criteria. Classification of structural methods is then brought forward, represented by specific projects and drawings.
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Turski, Michał, and Robert Sekret. "Conceptual adsorption system of cooling and heating supplied by solar energy." Chemical and Process Engineering 37, no. 2 (June 1, 2016): 293–304. http://dx.doi.org/10.1515/cpe-2016-0024.
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Abstract This paper presents the possibility of reducing the demand for nonrenewable primary energy for buildings using a new conceptual adsorption system of cooling and heating supplied by solar energy. Moreover, the aim of this study is to shorten the payback time of investment in the standard adsorption cooling system through its integration with the heating system. Research has been carried out for an energy-efficient medium-sized single-family building with a floor area of 140 m2 and a heat load of 4.2 kW and cold load of 4.41 kW. It has been shown that the use of an adsorption system of cooling and heating supplied by solar energy decreased the demand for nonrenewable primary energy by about 66% compared to the standard building that meets the current requirements.
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Muller, Matthew D., Zhaohui Gao, Patrick M. McQuillan, Urs A. Leuenberger, and Lawrence I. Sinoway. "Coronary responses to cold air inhalation following afferent and efferent blockade." American Journal of Physiology-Heart and Circulatory Physiology 307, no. 2 (July 15, 2014): H228—H235. http://dx.doi.org/10.1152/ajpheart.00174.2014.
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Cardiac ischemia and angina pectoris are commonly experienced during exertion in a cold environment. In the current study we tested the hypotheses that oropharyngeal afferent blockade (i.e., local anesthesia of the upper airway with lidocaine) as well as systemic β-adrenergic receptor blockade (i.e., intravenous propranolol) would improve the balance between myocardial oxygen supply and demand in response to the combined stimulus of cold air inhalation (−15 to −30°C) and isometric handgrip exercise (Cold + Grip). Young healthy subjects underwent Cold + Grip following lidocaine, propranolol, and control (no drug). Heart rate, blood pressure, and coronary blood flow velocity (CBV, from Doppler echocardiography) were continuously measured. Rate-pressure product (RPP) was calculated, and changes from baseline were compared between treatments. The change in RPP at the end of Cold + Grip was not different between lidocaine (2,441 ± 376) and control conditions (3,159 ± 626); CBV responses were also not different between treatments. With propranolol, heart rate (8 ± 1 vs. 14 ± 3 beats/min) and RPP responses to Cold + Grip were significantly attenuated. However, at peak exercise propranolol also resulted in a smaller ΔCBV (1.4 ± 0.8 vs. 5.3 ± 1.4 cm/s, P = 0.035), such that the relationship between coronary flow and cardiac metabolism was impaired under propranolol (0.43 ± 0.37 vs. 2.1 ± 0.63 arbitrary units). These data suggest that cold air breathing and isometric exercise significantly influence efferent control of coronary blood flow. Additionally, β-adrenergic vasodilation may play a significant role in coronary regulation during exercise.
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Wojciechowski, Sławomir. "Military Security in Central and Eastern Europe – from overarching principles to current NATO perspectives." Scientific Journal of the Military University of Land Forces 193, no. 3 (September 16, 2019): 547–57. http://dx.doi.org/10.5604/01.3001.0013.5009.
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This year, NATO is celebrating its 70th anniversary and the signing of the North Atlantic Treaty. The Alliance was founded in the early days of the Cold War, but found itself in a new geopolitical situation after the col-lapse of the Soviet Union and the end of the bipolar world. The organi-zation has been transforming ever since and over time this transfor-mation has included both expansion and adaptation to new circum-stances. With the return of Russian neo-imperial ambitions in the re-cent years, NATO has been given new impetus. Emerging threats and challenges, which are mainly of a military nature, have been addressed by NATO through further recent adaptation processes which were based on the return to the core role of the Alliance, namely collective defense and deterrence. This, in turn, has created a boost of NATO ac-tivity on the ground, which means that improvement with regard to interoperability and integration is now in high demand.
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Shohan, Ahmed Ali A., and Mohamed B. Gadi. "Evaluation of Thermal and Energy Performance in Mosque Buildings for Current Situation (Simulation Study) in Mountainous Climate of Abha City." Sustainability 12, no. 10 (May 14, 2020): 4014. http://dx.doi.org/10.3390/su12104014.
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Achieving and maintaining indoor thermal comfort is a crucial factor for energy saving and human health, especially in heavily occupied public buildings, such as mosque buildings. The acceptable level of thermal comfort should not be achieved at the expense of damaging the environment by using preventable energy depletion. This study aims to investigate what level thermal comfort is achieved and related issues in mosque buildings in Abha city, which has a semi-arid moderate/cold mountainous climate. The research involved a computer modelling investigation by using Thermal Analysis Software (TAS). A number of comparisons of the simulation results with actual measurement data in mosque buildings, such as temperature, relative humidity, and energy demand were conducted. Main factors influencing thermal comfort and PMV were investigated for the selected mosques. In addition, thermal performance of mosques’ fabrics and envelopes in terms of solar gain and heat loss/gain by conduction and its impacts on thermal comfort and energy demands were also discussed. The outcome showed some discomfort due to heat gain in summer and heat loss in winter. The results also revealed that the main factors behind heat gain or loss were the poor quality of the investigated mosque buildings’ envelopes, including walls, roofs, floors, windows, and doors.
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Morales-Rivera, Juan, Belkis Sulbarán-Rangel, Kelly Joel Gurubel-Tun, Jorge del Real-Olvera, and Virgilio Zúñiga-Grajeda. "Modeling and Optimization of COD Removal from Cold Meat Industry Wastewater by Electrocoagulation Using Computational Techniques." Processes 8, no. 9 (September 11, 2020): 1139. http://dx.doi.org/10.3390/pr8091139.
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In this paper, electrocoagulation (EC) treatment for the removal of chemical oxygen demand (COD) from cold meat industry wastewater is modeled and optimized using computational techniques. Methods such as artificial neural networks (ANNs) and response surface methodology (RSM), based on the Box–Behnken design using three levels, were employed to calculate the best control parameters for pH (5–9), current density (2–6 mA/cm2) and EC time (20–60 min). Analysis of variance (ANOVA) and 3D graphs revealed that pH and current density are the main parameters used for depicting the EC process. The developed models successfully describe the process with a correlation coefficient of R2 = 0.96 for RSM and R2 = 0.99 for ANN. The models obtained were optimized applying the moth-flame optimization (MFO) algorithm to find the best operating conditions for COD removal. ANN-MFO was used and showed superior COD removal (92.91%) under conditions of pH = 8.9, current density = 6.6 mA/cm2 and an EC time of 38.62 min. The energy consumption with these optimal conditions was 6.92 kWh/m3, with an operational cost of $3.14 (USD)/m3. These results suggest that the proposed computational model can be used to obtain more effective and economical treatments for this type of effluent.
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Wang, Hong Wei, Ya Dong Zheng, and Fang Wen Tu. "Influences of External Windows on Energy Consumption of Industrial Buildings in Cold Areas." Advanced Materials Research 250-253 (May 2011): 3055–58. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.3055.
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Shenyang is located in the cold areas and main industy city in China. The most current industrial buildings can’t meet the demand of energy-saving standard because of the thermal insulation performance of the windows.This paper aims at using DeST software to analyze industrial workshop energy consumption, according to different types of external windows and window-wall ratio of buildings to provide reference for energy saving design of industrial buildings in Shenyang area.The thermal performance of the windows has great effect on the heat load. The lower the heat transfer coefficient of windows is, the more beneficial for energy saving of the buildings. The window-wall ratio has great effect on the energy consumption, and different heat-transfer coefficients possess various sensitivity for window-wall ratio, and reflective glass varis smaller than the others.It is better for energy saving to replace the conventional windows with plastic-steel reflective glass windows.
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Nair, Ajay, and Donglin Zhang. "Propagation of Stewartia: Past Research Endeavors and Current Status." HortTechnology 20, no. 2 (April 2010): 277–82. http://dx.doi.org/10.21273/horttech.20.2.277.
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Stewartias (Stewartia spp.) are prized for their camellia (Camellia japonica)-like flowers, intense fall color, and exfoliating bark. In spite of having outstanding ornamental value and features, these plants are not readily available for landscaping in the horticulture trade. The primary reason stated is the difficulty of its mass propagation and production. In the last two decades, considerable research has been conducted on various aspects of stewartia propagation such as seed germination, cutting type, light, rooting medium, rooting hormone, cold acclimation, and tissue culture. In this article, we discuss factors that directly influence propagation of stewartia and we highlight results of published studies to propagate stewartia. The evidence indicates success in adventitious rooting of cuttings but at the same time recognizes the continuing challenge associated with overwinter survival. Sexual propagation has also been studied, but its commercial application is limited. To date, there is lack of concrete information on why stewartia remains under-represented in our landscapes. It still remains unclear if it is the lack of consumer demand or existing propagation difficulties that is the cause of under utilization of stewartia. Given the information from most published studies, we suggest further research on the aspect of overwinter survival in addition to a survey of the nursery and greenhouse industry to accurately determine the cause behind the absence of stewartia in horticultural trade.
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Fill, Marc, and Mirko Kleingries. "Modeling and Simulation of Either Co-Current or Countercurrent Operated Reverse-Osmosis-Based Air Water Generator." Membranes 11, no. 12 (November 23, 2021): 913. http://dx.doi.org/10.3390/membranes11120913.
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Technologies for obtaining drinkable water are becoming more important as global water consumption steadily increases and climate change progresses. One possibility for obtaining water is the extraction of water vapor from ambient air by means of air water generators (AWG). Previous studies in the field of AWG have mainly dealt with the condensation of humidity on cold surfaces with a cooling system or with absorption and thermal desorption. In this paper, another possibility for AWG is investigated, specifically AWG using absorption and reverse osmosis. For this purpose, models have been set up for an absorber operated in countercurrent and reverse osmosis membrane modules operated in co-current and countercurrent. With these models, simulations with different boundary conditions were then carried out using the programming language Python. The simulations have shown that the reverse osmosis membrane modules operated in countercurrent generally have a lower energy demand and require fewer reverse osmosis stages than those operated in co-current.
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Gómez-Rodríguez, Cristian, Daniel Fernández-González, Linda Viviana García-Quiñonez, Guadalupe Alan Castillo-Rodríguez, Josué Amilcar Aguilar-Martínez, and Luis Felipe Verdeja. "MgO Refractory Doped with ZrO2 Nanoparticles: Influence of Cold Isostatic and Uniaxial Pressing and Sintering Temperature in the Physical and Chemical Properties." Metals 9, no. 12 (December 1, 2019): 1297. http://dx.doi.org/10.3390/met9121297.
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The chemical environment and the internal conditions of the furnaces and ladles are extremely aggressive for the refractories, so metallurgical industries demand refractory linings with greater durability and resistance to avoid unforeseen stoppages and to reduce the changes of the furnace lining. Therefore, the current work aims to evaluate the impact of the additions of ZrO2-nanoparticles (1, 3, and 5 wt. %) in magnesia-based bricks. A comparative study of the physical and chemical properties in bricks obtained using two cold pressing techniques (uniaxial and isostatic pressing) and two sintering temperatures (1550 and 1650 °C) was carried out. The microstructure and crystalline phase characteristics obtained after the heat treatments and the slag corrosion test was studied using scanning electron microscopy/electron dispersive X-ray spectroscopy (SEM/EDX) and X-ray diffraction (XRD). The results reveal that the sample with 5 wt. % of ZrO2 nanoparticles (obtained by cold isostatic pressing and sintering at 1650 °C) has the lowest porosity and greatest resistance to penetration of blast furnace slag.
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Suraraksa and Shin. "Urban Transportation Network Design for Fresh Fruit and Vegetables Using GIS–The Case of Bangkok." Applied Sciences 9, no. 23 (November 22, 2019): 5048. http://dx.doi.org/10.3390/app9235048.
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A cold chain for perishable fresh products aims to preserve the quality of the products under the control of a predefined temperature range. To satisfy the delivery conditions within appropriate time windows, the most critical operations in cold chain management is the transportation and distribution of fresh products. Due to rapid population growth and increasing demand for high-quality fresh foods, it becomes critical to develop advanced transportation and distribution networks for fresh products, particularly in urban areas. This research aims to design different scenarios based on mathematical models for fresh products transportation and distribution network in the Bangkok metropolitan area using Geographic Information system (GIS). The proposed methodology integrates location–allocation and vehicle routing problem analysis. The performance of all possible scenarios is evaluated and compared by considering the number of required distribution centers and trucks, total travel time, total travel distance, as well as fairness among drivers. The results of the scenario analysis highlight that the alternative scenarios show a better performance as compared to the current network. In addition, the administrator can make a different decision among several alternatives by considering different aspects, such as investment cost, operating cost, and balance of using available resources. Therefore, it may help a public officer to design the fresh products logistics network considering actual demand and traffic conditions in Bangkok.
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Kaftan, David, George F. Corliss, Richard J. Povinelli, and Ronald H. Brown. "A Surrogate Weather Generator for Estimating Natural Gas Design Day Conditions." Energies 14, no. 21 (November 1, 2021): 7118. http://dx.doi.org/10.3390/en14217118.
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Natural gas customers rely upon utilities to provide gas for heating in the coldest parts of winter. Heating capacity is expensive, so utilities and end users (represented by commissions) must agree on the coldest day on which a utility is expected to meet demand. The return period of such a day is long relative to the amount of weather data that are typically available. This paper develops a weather resampling method called the Surrogate Weather Resampler, which creates a large dataset to support analysis of extremely infrequent events. While most current methods for generating weather data are based on simulation, this method resamples the deviations from typical weather. The paper also shows how extreme temperatures are strongly correlated to the demand for natural gas. The Surrogate Weather Resampler was compared in-sample and out-of-sample to the WeaGETS weather generator using both the Kolmogorov–Smirnov test and an exceedance-based test for cold weather generation. A naïve benchmark was also examined. These methods studied weather data from the National Oceanic and Atmospheric Administration and AccuWeather. Weather data were collected for 33 weather stations across North America, with 69 years of data from each weather station. We show that the Surrogate Weather Resampler can reproduce the cold tail of distribution better than the naïve benchmark and WeaGETS.
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Zhou, Lijuan, Feifei Zhang, Shudong Zhang, and Min Xu. "Study on the Personalized Learning Model of Learner-Learning Resource Matching." International Journal of Information and Education Technology 11, no. 3 (2021): 143–47. http://dx.doi.org/10.18178/ijiet.2021.11.3.1503.
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With the development of service integration technology, online learning platforms have gathered a large number of learning resources, causing learners to get lost in a variety of course information and it is difficult to obtain learning resources that match their own needs. The proposal of personalized learning gives the problem a direction to solve. However, current personalized learning resource recommendation services facing problems such as excessive candidate resources, sparse history and cold starts. In addition, the learning resources provided also show problems of "difficult or easy, uneven quality". For this article researches the personalized learning recommendation model of learner-learning resource matching. The main content includes three parts: First, build a demand model based on learner registration information, learning behavior and other data. Second, analyze the access behavior of learning resources and assess their quality. Third, calculate the matching degree between learners and learning resources based on the demand model and the quality information of the learning resources, and recommend them.
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Kraus, Martin, and Marion Merklein. "Investigation of Size Effects in Multi-Stage Cold Forming of Metallic Micro Parts from Sheet Metal." Micromachines 12, no. 12 (December 15, 2021): 1561. http://dx.doi.org/10.3390/mi12121561.
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Product miniaturisation and functional integration are currently global trends to save weight, space, materials and costs. This leads to an increasing demand for metallic micro components. Thus, the development of appropriate production technologies is in the focus of current research activities. Due to its efficiency, accuracy and short cycle times, microforming at room temperature offers the potential to meet the steadily increasing demand. During microforming, size effects occur which negatively affect the part quality, process stability, tool life and handling. Within this contribution, a multi-stage bulk microforming process from sheet metal is investigated for the materials Cu-OFE and AA6014 with regard to the basic feasibility and the occurrence of size effects. The results reveal that the process chain is basically suitable to produce metallic micro parts with a high repeatability. Size effects are identified during the process. Since several studies postulate that size effects can be minimised by scaling down the metallic grain structure, the grain size of the aluminium material AA6014-W is scaled down to less than one micrometre by using an accumulative roll bonding process (ARB). Subsequently, the effects of the ultrafine grain (UFG) structure on the forming process are analysed. It could be shown that a strengthened material state increases the material utilization. Furthermore, too soft materials can cause damage on the part during ejection. The occurring size effects cannot be eliminated by reducing the grain size.
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Wu, Haixia, and Sang-Bing Tsai. "An Empirical Study on the Employment Monitoring and Early Warning Mechanism of Medical Graduates in Universities with Big Data and Complex Computing System." Discrete Dynamics in Nature and Society 2021 (December 8, 2021): 1–10. http://dx.doi.org/10.1155/2021/6846236.
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Based on the management of big data, the analysis and forecast of the employment demand cycle business situation studied in this article is based on the employment cycle theory and a complete set of employment monitoring, employment evaluation, employment forecasting, and policy selection theories and strategies developed around the employment cycle fluctuations, a specific employment phenomenon. First, systematically evaluate the current state of the employment demand boom, appropriately reflect the hot and cold degree of the employment demand boom, and provide necessary information for the government’s regulatory measures, content, and timing. Secondly, it reflects the regulatory effects of graduate employment monitoring, judging whether graduate employment monitoring measures are properly applied, whether they have the effect of smoothing out employment fluctuations, and promoting the country’s employment demand; in addition, business decision makers can take advantage of the employment demand boom, by monitoring the information provided by the early warning system and timely foreseeing the upcoming macrocontrol measures, so that enterprises’ labor adjustments can adapt to the government’s regulatory measures. At the same time, the model proposes a prosperity index method for monitoring and early warning of the employment demand cycle. After selecting and dividing three types of prosperity indicators, the DI index reflecting the trend of the prosperity change and the CI index reflecting the strength of the prosperity change are calculated and constructed. The national employment demand boom monitoring and early warning signal system predicts the trend of the employment boom cycle outside the sample period. The experimental results show that the cyclic prosperity forecast results are consistent not only with the national employment demand prosperity in recent months, but also with the use of the structural measurement ARIMA (p, d, q) model. The alertness value is close, indicating that this indicator system has a good effect on the national employment demand boom monitoring and early warning.
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del Real-Olvera, Jorge, Juan Morales-Rivera, Ana Patricia González-López, Belkis Sulbarán-Rangel, and Virgilio Zúñiga-Grajeda. "Adsorption of Organic Pollutants from Cold Meat Industry Wastewater by Electrochemical Coagulation: Application of Artificial Neural Networks." Water 12, no. 11 (October 29, 2020): 3040. http://dx.doi.org/10.3390/w12113040.
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The cold meat industry is considered to be one of the main sources of organic pollutants in the wastewater of the meat sector due to the complex mixture of protein, fats, and dyes present. This study describes electrochemical coagulation (EC) treatment for the adsorption of organic pollutants reported in cold meat industry wastewater, and an artificial neural network (ANN) was employed to model the adsorption of chemical oxygen demand (COD). To depict the adsorption process, the parameters analyzed were current density (2–6 mA cm−2), initial pH (5–9), temperature (288–308 K), and EC time (0–180 min). The experimental results were fit to the Langmuir and Freundlich isotherm equations, while the modeling of the adsorption kinetics was evaluated by means of pseudo-first and pseudo-second-order rate laws. The data reveal that current density is the main control parameter in EC treatment, and 60 min are required for an effective adsorption process. The maximum removal of COD was 2875 mg L−1 (82%) when the following conditions were employed: pH = 7, current density = 6 mA cm−2, and temperature of 298 K. Experimental results obey second-order kinetics with values of the constant in the range of 1.176 × 10−5 ≤ k2 (mg COD adsorbed/g-Al.min) ≤ 1.284 × 10−5. The ANN applied in this research established that better COD removal, 3262.70 mg L−1 (93.22%) with R2 = 0.98, was found using the following conditions: EC time of 30.22 min, initial pH = 7.80, and current density = 6 mA cm−2. The maximum adsorption capacity of 621.11 mg g−1 indicates a notable affinity between the organic pollutants and coagulant metallic ions.
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Karangwa, Shanice A., Ton Lisman, and Robert J. Porte. "Anticoagulant Management and Synthesis of Hemostatic Proteins during Machine Preservation of Livers for Transplantation." Seminars in Thrombosis and Hemostasis 46, no. 06 (August 5, 2020): 743–50. http://dx.doi.org/10.1055/s-0040-1715452.
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AbstractLiver transplantation remains the only curative treatment for patients with end-stage liver disease. Despite a steadily increasing demand for suitable donor livers, the current pool of donor organs fails to meet this demand. To resolve this discrepancy, livers traditionally considered to be of suboptimal quality and function are increasingly utilized. These marginal livers, however, are less tolerant to the current standard cold preservation of donor organs. Therefore, alternative preservation methods have been sought and are progressively applied into clinical practice. Ex situ machine perfusion is a promising alternative preservation modality particularly for suboptimal donor livers as it provides the ability to resuscitate, recondition, and test the viability of an organ prior to transplantation. This review addresses the modalities of machine perfusion currently being applied, and particularly focuses on the hemostatic management employed during machine perfusion. We discuss the anticoagulant agents used, the variation in dosage, and administration, as well as the implications of perfusion for extended periods of time in terms of coagulation activation associated with production of coagulation factors during perfusion. Furthermore, in regard to viability testing of an organ prior to transplantation, we discuss the possibilities and limitations of utilizing the synthesis of liver-derived coagulation factors as potential viability markers.
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Nelson, Robert G., Benjamin L. Campbell, Robert C. Ebel, and William A. Dozier. "The Current State of the Satsuma Marketing Effort in Alabama." HortScience 43, no. 2 (April 2008): 293–97. http://dx.doi.org/10.21273/hortsci.43.2.293.
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This article reviews the results of 5 years of marketing research on Alabama satsumas and makes recommendations for future progress. Although there are only 28 ha of satsuma orchards in production in Alabama at this time, there are a number of encouraging developments that suggest considerable potential for expanding the industry such as microsprinkler freeze protection, new early-maturing and cold-tolerant varieties, contract sales through the Farm-to-School Program, and rising demand for premium mandarins. Prospects for the industry marketing effort are considered from the perspectives of analyzing marketing opportunities, identifying market segments, selecting attractive target markets, designing marketing strategies, planning marketing programs, and managing the continuing marketing effort. A number of distinct consumer segments have been identified, including one that prefers fruit that is still slightly green and another that prefers a longer shelf life. A peeled-and-sectioned product also appears to have considerable market potential. Name recognition is still a problem as is insipid flavor from fruit that is marketed beyond its optimal ripeness. Needs for the future are detailed and include the needs of the commodity (freeze protection and expanded acreage), the needs of the market (consistency and quality), the needs of the product (quality standards and consumer awareness), the need for and the needs of a brand (recognition and equity potential), the needs of an organization (cooperation and leadership), and the needs of the industry (processes for building equity, forestalling competition, reducing supply shocks, and attracting investment).
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Abdullah, Shahino Mah. "Smart Energy Consumption Could Preserve Natural Resources." ICR Journal 8, no. 3 (July 15, 2017): 420–22. http://dx.doi.org/10.52282/icr.v8i3.183.
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Energy plays an important role in our lives. It comes in several forms which can be utilised to keep people warm during cold weather, provide foods, improve transportation, and increase productivity. When energy is utilised efficiently, it brings great comfort to our lives. However, energy consumption has been increasing in recent decades as the world population keeps growing. According to a United Nation (UN) report, the current world population of 7.4 billion is projected to increase by 1 billion over the next 10 years and reach 9.6 billion by 2050. Besides population, the standards of living for many people in developing countries is increasing, which in turn results in growing energy demand.
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Hadji, Fahrudin, Imran Taeran, M. Janib Ahmad, Martini Djamhur, Kusdi Hi Iksan, and Amirul Karman. "Evaluasi Pemanfaatan dan Kepuasan Fasilitas Rantai Dingin dan SPDN di PPP Bacan Kabupaten Hlmahera Selatan." Marine Fisheries : Journal of Marine Fisheries Technology and Management 12, no. 1 (May 25, 2021): 1–10. http://dx.doi.org/10.29244/jmf.v12i1.33865.
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Based on information from fishermen and fish entrepreneurs, about 95.5% of the catch landed in the Bacan fishing port is stored in the air blast freezer (ABF) which is targeted for regional and exportsmarkets, while the remaining 4.5% is sold locally. The actual condition shows that the ABF has limited capacity. Furthermore, the need for ice blocks and diesel fuel (BBM) cannot be full filed as the ice factory and fuel station (SPDN) inside the port was not able to meet the current demand. As a result, fishermen have to buy from outside fishing port .In order to improve the port service, development program supported by scientific investigation on existing port performance is required. Therefore, this study aims to analyze the level of utilization and satisfaction of users of cold chain facilities and SPDN in PPP Bacan. The research was conducted at PPP Bacan, South Halmahera Regency, North Maluku Province, from August to September. Data were collected within 2 weeks, from 5 to 19 September 2020. The results showed that the utilization rate of ice factory facilities, ABF, and SPDN had exceeded the optimal limit, while the cold stroge was not optimal. All stakeholders (skippers, fishermen, and fish buyers) expressed their dissatisfaction with the service of the ice factory facilities, ABF, and SPDN, while the cold storage facilities were very satisfied.
Keywords: Evaluation, utilization, satisfaction, cold chain, coast fishing port, Bacan.
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Etxebarria, Matxalen, Xabat Oregi, Olatz Grijalba, and Rufino J. Hernández. "Relationship Between Energy Demand, Indoor Thermal Behaviour and Temperature-Related Health Risk Concerning Passive Energy Refurbishment Interventions." Environmental and Climate Technologies 24, no. 2 (September 1, 2020): 348–63. http://dx.doi.org/10.2478/rtuect-2020-0078.
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AbstractThe main objective of this article is to demonstrate that passive energy refurbishment interventions influence comfort conditions of households for both cold and hot annual periods, while they help to avoid or promote temperature-related health risk situations. However, improving the thermal efficiency of the building envelope is encouraged in order to reduce energy demand for heating and cooling instead of considering also their impact on users’ health. The calculation methodology to quantify improvements, on the other hand, is drawn from regulation-based standards, which describe the optimal achievable efficiency levels and energy cost savings. The present study, however, addresses how diverse thermal performance variables are (climate, thermal comfort range and occupancy rate), and shows that different thermal assessment standards influence the obtained results. An energy simulation approach was developed to evaluate different scenarios and compare the results. In conclusion, the results contribute to an understanding or to a discussion of the suitability of current energy renovation policies with regard to indoor thermal comfort and temperature-related health risk situations.
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Wang, Chao, Hengshu Zhu, Peng Wang, Chen Zhu, Xi Zhang, Enhong Chen, and Hui Xiong. "Personalized and Explainable Employee Training Course Recommendations: A Bayesian Variational Approach." ACM Transactions on Information Systems 40, no. 4 (October 31, 2022): 1–32. http://dx.doi.org/10.1145/3490476.
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As a major component of strategic talent management, learning and development (L&D) aims at improving the individual and organization performances through planning tailored training for employees to increase and improve their skills and knowledge. While many companies have developed the learning management systems (LMSs) for facilitating the online training of employees, a long-standing important issue is how to achieve personalized training recommendations with the consideration of their needs for future career development. To this end, in this article, we present a focused study on the explainable personalized online course recommender system for enhancing employee training and development. Specifically, we first propose a novel end-to-end hierarchical framework, namely Demand-aware Collaborative Bayesian Variational Network (DCBVN), to jointly model both the employees’ current competencies and their career development preferences in an explainable way. In DCBVN, we first extract the latent interpretable representations of the employees’ competencies from their skill profiles with autoencoding variational inference based topic modeling. Then, we develop an effective demand recognition mechanism for learning the personal demands of career development for employees. In particular, all the above processes are integrated into a unified Bayesian inference view for obtaining both accurate and explainable recommendations. Furthermore, for handling the employees with sparse or missing skill profiles, we develop an improved version of DCBVN, called the Demand-aware Collaborative Competency Attentive Network (DCCAN) framework , by considering the connectivity among employees. In DCCAN, we first build two employee competency graphs from learning and working aspects. Then, we design a graph-attentive network and a multi-head integration mechanism to infer one’s competency information from her neighborhood employees. Finally, we can generate explainable recommendation results based on the competency representations. Extensive experimental results on real-world data clearly demonstrate the effectiveness and the interpretability of both of our frameworks, as well as their robustness on sparse and cold-start scenarios.
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Kalghatgi, Gautam, and Bengt Johansson. "Gasoline compression ignition approach to efficient, clean and affordable future engines." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232, no. 1 (April 3, 2017): 118–38. http://dx.doi.org/10.1177/0954407017694275.
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The worldwide demand for transport fuels will increase significantly but will still be met substantially (a share of around 90%) from petroleum-based fuels. This increase in demand will be significantly skewed towards commercial vehicles and hence towards diesel and jet fuels, leading to a probable surplus of lighter low-octane fuels. Current diesel engines are efficient but expensive and complicated because they try to reduce the nitrogen oxide and soot emissions simultaneously while using conventional diesel fuels which ignite very easily. Gasoline compression ignition engines can be run on gasoline-like fuels with a long ignition delay to make low-nitrogen-oxide low-soot combustion very much easier. Moreover, the research octane number of the optimum fuel for gasoline compression ignition engines is likely to be around 70 and hence the surplus low-octane components could be used without much further processing. Also, the final boiling point can be higher than those of current gasolines. The potential advantages of gasoline compression ignition engines are as follows. First, the engine is at least as efficient and clean as current diesel engines but is less complicated and hence could be cheaper (lower injection pressure and after-treatment focus on control of carbon monoxide and hydrocarbon emissions rather than on soot and nitrogen oxide emissions). Second, the optimum fuel requires less processing and hence would be easier to make in comparison with current gasoline or diesel fuel and will have a lower greenhouse-gas footprint. Third, it provides a path to mitigate the global demand imbalance between heavier fuels and lighter fuels that is otherwise projected and improve the sustainability of refineries. The concept has been well demonstrated in research engines but development work is needed to make it feasible on practical vehicles, e.g. on cold start, adequate control of exhaust carbon monoxide and hydrocarbons and control of noise at medium to high loads. Initially, gasoline compression ignition engines technology has to work with current market fuels but, in the longer term, new and simpler fuels need to be supplied to make the transport sector more sustainable.
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Musaelyan, Dmytro, and Yuliya Kuntsevych. "Legal bases of circulation of cold weapons in Ukraine." Naukovyy Visnyk Dnipropetrovs'kogo Derzhavnogo Universytetu Vnutrishnikh Sprav 3, no. 3 (September 30, 2021): 197–202. http://dx.doi.org/10.31733/2078-3566-2021-3-197-202.
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The scientific article determines the current state of legal regulation of the circulation of cold steel in Ukraine and also analyzes the latest bills to regulate this issue. A study of the social climate and opinions of Ukrainian citizens on the free possession of cold steel is conducted. The study identified the concept of «cold steel» and its qualifications. The analysis of normative documents in which the classification of types of cold steel and methods of forensic research are considered is carried out. The main criteria the category of cold steel are defined. The articles summarize the lack of certain means of cold steel, as well as the methodology itself, which determines which weapon belongs to the category of cold steel, and this language presupposes the presence of certain technical parameters. This situation creates a huge space for abuse both by experts, which can distort the results of the examination and by unscrupulous sellers, which can lead to a false phenomenon of possession of completely legal weapons and as a consequence may lead to criminal prosecution of Ukrainian citizens for part 2 of Article 263 of the Criminal Code of Ukraine «Illegal handling of weapons, ammunition or explosives». To resolve this controversial issue, our own methodology and criteria for classifying certain means as «cold steel» as well as decriminalization of liability for carrying a cold weapon are proposed, because the Code of Administrative Offenses of Ukraine contains certain articles that already provide for liability for improper acquisition and storage of cold steel. Thus, today in Ukraine it is urgent to adopt a law on arms, which will clearly define such concepts as cold steel, research methods that will be simple and clear to anyone, whether he is a citizen of Ukraine or not, because many abuses by police officers who demand bribes in connection with this issue or take away items of historical or simply material value. There is no legal regulation of civil armaments in Ukraine, and therefore it cannot categorically raise the issue of criminal liability for committing certain actions in the absence of legal regulation of public relations in response to these issues. Criminological research has long and convincingly proven that punishment has never and nowhere been among the main deterrents to committing crimes. The existence of absurdly strict laws has never had a positive effect on the crime situation in the country.
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Dong, Hanlin, Zhijian Fang, Al-wesabi Ibrahim, and Jie Cai. "Optimized Operation of Integrated Energy Microgrid with Energy Storage Based on Short-Term Load Forecasting." Electronics 11, no. 1 (December 22, 2021): 22. http://dx.doi.org/10.3390/electronics11010022.
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This research proposes an optimization technique for an integrated energy system that includes an accurate prediction model and various energy storage forms to increase load forecast accuracy and coordinated control of various energies in the current integrated energy system. An artificial neural network is utilized to create an accurate short-term load forecasting model to effectively predict user demand. The 0–1 mixed integer linear programming approach is used to analyze the optimal control strategy for multiple energy systems with storage, cold energy, heat energy, and electricity to solve the problem of optimal coordination. Simultaneously, a precise load forecasting method and an optimal scheduling strategy for multienergy systems are proposed. The equipment scheduling plan of the integrated energy system of gas, heat, cold, and electricity is proposed after researching the operation characteristics and energy use process of the equipment in the combined power supply system. A system economic operation model is created with profit maximization in mind, while also taking into account energy coordination between energy and the power grid. The rationality of the algorithm and model is verified by analyzing the real data of a distributed energy station in Wuhan for two years.
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French, John D. "How the Not-So-Powerless Prevail: Industrial Labor Market Demand and the Contours of Militancy in Mid-Twentieth-Century São Paulo, Brazil." Hispanic American Historical Review 90, no. 1 (February 1, 2010): 109–42. http://dx.doi.org/10.1215/00182168-2009-092.
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Abstract Extensive interviews and confidential police and judicial records are used to explore the life of Marcos Andreotti (1910–1984), a lifelong Communist labor leader active in the industrial ABC region of greater São Paulo. The intensified persecution faced by Andreotti in the early Cold War years is placed within the trajectory of Andreotti’s working life as a skilled electrician. The labor market demand for skilled workers, it is shown, provided the foundation for Andreotti’s sustained militancy and decisively shaped his philosophy of shop floor organizing based on a dialectic between the skilled and the unskilled. This essay sheds new light on the poorly understood foundations of working-class political and labor militancy, while highlighting unexpected continuities between the era of Andreotti, before 1964, and the world of the “New Unionism” in the late 1970s, which began in ABC under the leadership of Brazil’s current president, Luiz Inácio Lula da Silva.
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Meneghetti, Antonella, Chiara Pagnin, and Patrizia Simeoni. "Decarbonizing the Cold Chain: Long-Haul Refrigerated Deliveries with On-Board Photovoltaic Energy Integration." Sustainability 13, no. 15 (July 29, 2021): 8506. http://dx.doi.org/10.3390/su13158506.
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Decarbonizing the cold chain is a priority for sustainability due to the increasing demand for chilled/frozen food and pharmaceutics. Refrigerated transport requires additional fuel for refrigeration other than for traction. Photovoltaic panels on the vehicle rooftop, a battery bank, and a power conversion system can replace the diesel engine driving the transport refrigerated unit. In long-haul deliveries, vehicles cross zones with different climate conditions, which affect both refrigeration requirements and photovoltaic energy conversion. Mandatory driver’s breaks and rest also affect delivery timing and energy consumption. A multiperiod, multizone optimization model is developed to size the onboard photovoltaic system, based on features of the delivery tour. The model is applied to a palletized chilled food delivery from North-Eastern Italy, showing a payback time of around four years, which can drop under two years for expected reduction of component costs. Economic and environmental performances can be increased by also allowing refrigerated products on-board during the return journey, leading to more fuel savings. Photovoltaic-integrated long-haul delivery for frozen products is not convenient at current market costs. Different climate conditions are tested, showing the model ability to act as a decision support tool to foster renewable energy penetration into the cold chain.
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Laron, Guy. "Surveying the Revolutionary Arc." International Journal of Middle East Studies 43, no. 2 (April 8, 2011): 323–25. http://dx.doi.org/10.1017/s0020743811000110.
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In the last decade, influenced by current economic trends, Cold War historians have made an effort to de-center the story of the Cold War. They have shifted their gaze from the center of the conflict—the face-offs in Europe between the Soviet Union and the United States—and cast an observing eye on the Third World. Unlike many Middle East historians who seek to understand the Middle East in terms of its unique cultures, languages, and religions, Cold War historians treat that area as part of a revolutionary arc that stretched from the jungles of Latin America to the jungles of Vietnam. Rather than emphasizing the region's singularity, they focus on the themes that united guerilla fighters in the West Bank and the Makong Delta as well as leaders from Havana to Damascus: anticolonial and anti-imperial struggles, the yearning for self-definition, and the fight against what Third World revolutionaries perceived as economic exploitation. The sudden interest in what was considered, until recently, the periphery of the Cold War has undoubtedly been fueled by the zeitgeist of a new century in which the so-called peripheral regions are set to become more dominant economically. Southeast and Southwest Asia, Latin America, Africa, and the Middle East have a surplus of young skilled workers who are increasingly in demand by the global economy as the growth of world population slows and more prosperous countries in West Europe and North America are graying fast. The Third World consists today of the very regions where most of the economic growth in coming decades will take place. Dependency theory has gone topsy-turvy: leading economists now look with hope at countries such as China, India, Turkey, and Egypt and expect them to become the new engines of global growth. It is not surprising, then, that historians are now taking a stronger interest in the tangled history of the Cold War in the Third World and discovering the agency that these countries always had.
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Doblin, Martina A., Katherina Petrou, Sutinee Sinutok, Justin R. Seymour, Lauren F. Messer, Mark V. Brown, Louiza Norman, et al. "Nutrient uplift in a cyclonic eddy increases diversity, primary productivity and iron demand of microbial communities relative to a western boundary current." PeerJ 4 (April 25, 2016): e1973. http://dx.doi.org/10.7717/peerj.1973.
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The intensification of western boundary currents in the global ocean will potentially influence meso-scale eddy generation, and redistribute microbes and their associated ecological and biogeochemical functions. To understand eddy-induced changes in microbial community composition as well as how they control growth, we targeted the East Australian Current (EAC) region to sample microbes in a cyclonic (cold-core) eddy (CCE) and the adjacent EAC. Phototrophic and diazotrophic microbes were more diverse (2–10 times greater Shannon index) in the CCE relative to the EAC, and the cell size distribution in the CCE was dominated (67%) by larger micro-plankton $(\geq 20\lrm{\mu }\mathrm{m})$, as opposed to pico- and nano-sized cells in the EAC. Nutrient addition experiments determined that nitrogen was the principal nutrient limiting growth in the EAC, while iron was a secondary limiting nutrient in the CCE. Among the diazotrophic community, heterotrophicNifHgene sequences dominated in the EAC and were attributable to members of the gamma-, beta-, and delta-proteobacteria, while the CCE contained both phototrophic and heterotrophic diazotrophs, includingTrichodesmium, UCYN-A and gamma-proteobacteria. Daily sampling of incubation bottles following nutrient amendment captured a cascade of effects at the cellular, population and community level, indicating taxon-specific differences in the speed of response of microbes to nutrient supply. Nitrogen addition to the CCE community increased picoeukaryote chlorophyllaquotas within 24 h, suggesting that nutrient uplift by eddies causes a ‘greening’ effect as well as an increase in phytoplankton biomass. After three days in both the EAC and CCE, diatoms increased in abundance with macronutrient (N, P, Si) and iron amendment, whereas haptophytes and phototrophic dinoflagellates declined. Our results indicate that cyclonic eddies increase delivery of nitrogen to the upper ocean to potentially mitigate the negative consequences of increased stratification due to ocean warming, but also increase the biological demand for iron that is necessary to sustain the growth of large-celled phototrophs and potentially support the diversity of diazotrophs over longer time-scales.
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Hou, Lianjian. "Discussion on Energy-Saving Design Measures of HVAC." World Construction 4, no. 3 (September 20, 2015): 15. http://dx.doi.org/10.18686/wcj.v4i3.4.
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<p>With continual increase of people's living quality requirements, the demand for buildings with HVAC systems is growing. As energy shortage intensifies today, EEBs (Energy-efficient Buildings) are becoming the main trend of future developments in the construction industry. Therefore, further improving HVAC energy-saving measures is a particularly important task and is the key issue being examined by current HVAC designers. This study starts with analyzing existing problems in energy-saving design of HVAC, and proposes some views and recommendations for HVAC energy-saving design method, as well as reasonable choices of parameters for HVAC systems such as energy-saving design of cooling and heating ventilation, energy-saving design of hot and cold water systems, and optimum heat recovery design of HVAC systems, in order to reduce buildings’ energy consumption and to improve energy efficiency for energy-saving purposes. </p>
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Hou, Lianjian. "Discussion on Energy-Saving Design Measures of HVAC." World Construction 4, no. 3 (September 20, 2015): 15. http://dx.doi.org/10.18686/wc.v4i3.4.
Full textAbstract:
<p>With continual increase of people's living quality requirements, the demand for buildings with HVAC systems is growing. As energy shortage intensifies today, EEBs (Energy-efficient Buildings) are becoming the main trend of future developments in the construction industry. Therefore, further improving HVAC energy-saving measures is a particularly important task and is the key issue being examined by current HVAC designers. This study starts with analyzing existing problems in energy-saving design of HVAC, and proposes some views and recommendations for HVAC energy-saving design method, as well as reasonable choices of parameters for HVAC systems such as energy-saving design of cooling and heating ventilation, energy-saving design of hot and cold water systems, and optimum heat recovery design of HVAC systems, in order to reduce buildings’ energy consumption and to improve energy efficiency for energy-saving purposes. </p>
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Mikulik, Jerzy. "Energy Demand Patterns in an Office Building: A Case Study in Kraków (Southern Poland)." Sustainability 10, no. 8 (August 16, 2018): 2901. http://dx.doi.org/10.3390/su10082901.
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Office buildings play a significant role in shaping the current electricity demand and its trends. Their energy demand patterns impact the power system operation on a national and regional level. What is more, both (office buildings and the power system) are also simultaneously influenced by meteorological parameters. Considering the above, the aim of this paper is to analyze a three-year hourly energy demand time series recorded in a relatively large office building in Kraków (Southern Poland). This paper will fill a gap in the literature as there is a lack of evidence from Central European countries in the area of office buildings’ energy demand and its relationship with meteorological parameters. The data was obtained from a local electricity provider whereas meteorological parameters came from weather station and satellite measurements. The analyses focused on determining the typical weekly and daily demand patterns as well as on investigating the correlation between meteorological parameters (wind speed, irradiation, humidity, and air temperature) and observed energy consumption. To estimate the correlation between investigated variables, a Pearson coefficient of correlation was used. For distinguishing typical load patterns, a k-means clustering method was applied. The relationship between meteorological parameters and load was also tested based on multiple linear regression analysis. The results indicated that energy demand had a relatively strong positive correlation with irradiation and with temperature and a negative one with humidity. The correlation with wind speed was not greater than 0.25. Dividing the data into three subsets shows that energy demand generally exhibits a stronger correlation with meteorological parameters on working days. Additionally, clustering analysis has shown that it is possible to distinguish three typical daily patterns of energy demand and meteorological parameters that correspond to a hot/warm day, cold days and days that are intermediary between those two. The regression analysis showed that meteorological parameters can explain/model a significant part of the load variability (up to 50%) although the quality of such models is relatively poor (in terms of mean absolute percentage error the best model exhibited a value of 16%). The results of this study can be used as a benchmark for similar office buildings that received the same level of sustainability certification, or in the future analysis of climate change impact on power demand.
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Ravi, Rengarajan, and Karunakaran Rajasekaran. "Experimental study of solidification of paraffin wax in solar based triple concentric tube thermal energy storage system." Thermal Science 22, no. 2 (2018): 973–78. http://dx.doi.org/10.2298/tsci160311021r.
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This paper addresses an experimental investigation of a solar based thermal energy storage system to meet current energy demand especially for milk industry in Tamil Nadu, India. A solar based energy storage system has been designed to study the heat transfer characteristics of paraffin wax where it is filled in the middle tube, with cold heat transfer fluid flowing outer tube, inner tube, and both tubes at a time during solidification process in a horizontal triple concentric heat exchanger. In this study, main concentrations are temperature distributions in the energy storage materials such as paraffin wax during solidification process and total solidification time. Three heat recovery methods were used to solidify paraffin wax from the inside tube, outside tube, and both tubes methods to improve the heat transfer between heat transfer fluid and phase change materials. The experiment has been performed for different heat transfer fluid mass-flow rates and different inlet temperatures and predicted results shows that solidification time is reduced.
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Nowak, Michael A., B. A. Vaughan, J. Dove, and J. Wilms. "Cygnus X–1: A Case for a Magnetic Accretion Disk?" International Astronomical Union Colloquium 163 (1997): 366–69. http://dx.doi.org/10.1017/s025292110004286x.
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AbstractWith the advent of RXTE, which is capable of broad spectral coverage and fast timing, as well as other instruments which are increasingly being used in multi-wavelength campaigns (via both space-based and ground-based observations), we must demand more of our theoretical models. No current model mimics all facets of a system as complex as an x-ray binary. However, a modern theory should qualitatively reproduce — or at the very least not fundamentally disagree with – all of Cygnus X–1’s most basic average properties: energy spectrum (viewed within a broader framework of black hole candidate spectral behavior), power spectrum (PSD), and time delays and coherence between variability in different energy bands. Below we discuss each of these basic properties in turn, and we assess the health of one of the currently popular theories: Comptonization of photons from a cold disk. We find that the data pose substantial challenges for this theory, as well as all other currently discussed models.
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Sacco, Alessandro, Anna Martina Battaglia, Cirino Botta, Ilenia Aversa, Serafina Mancuso, Francesco Costanzo, and Flavia Biamonte. "Iron Metabolism in the Tumor Microenvironment—Implications for Anti-Cancer Immune Response." Cells 10, no. 2 (February 2, 2021): 303. http://dx.doi.org/10.3390/cells10020303.
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New insights into the field of iron metabolism within the tumor microenvironment have been uncovered in recent years. Iron promotes the production of reactive oxygen species, which may either trigger ferroptosis cell death or contribute to malignant transformation. Once transformed, cancer cells divert tumor-infiltrating immune cells to satisfy their iron demand, thus affecting the tumor immunosurveillance. In this review, we highlight how the bioavailability of this metal shapes complex metabolic pathways within the tumor microenvironment and how this affects both tumor-associated macrophages and tumor-infiltrating lymphocytes functions. Furthermore, we discuss the potentials as well as the current clinical controversies surrounding the use of iron metabolism as a target for new anticancer treatments in two opposed conditions: (i) the “hot” tumors, which are usually enriched in immune cells infiltration and are extremely rich in iron availability within the microenvironment, and (ii) the “cold” tumors, which are often very poor in immune cells, mainly due to immune exclusion.
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Akyereko, Yaw Gyau, Faustina Dufie Wireko-Manu, Francis Alemawor, and Mary Adzanyo. "Effects of Production Methods on Flavour Characteristics of Nonalcoholic Wine." Journal of Food Quality 2021 (December 15, 2021): 1–10. http://dx.doi.org/10.1155/2021/3014793.
Full textAbstract:
The growing awareness on the negative effects of alcohol on health and other factors like religious beliefs, responsible driving, and strict alcohol regulatory laws have contributed to the overwhelming demand for nonalcoholic wines. Numerous methods are available for producing nonalcoholic wines which encompass both restrictive ethanol production processes (interrupted fermentation, cold fermentation, juice/wine blends, use of unripe fruit, enzyme, and special and immobilized yeasts) and alcohol removal methods (heat, membrane, and extraction techniques). Studies have shown that these methods significantly affect the flavour characteristics of the wine, which is a key quality parameter in wine purchasing and consumption. It is in view of this that this work seeks to review current articles on the effects of production methods on the flavour characteristics of nonalcoholic wine. This review will provide insight on nonalcoholic wine production methods, their merits and demerits, and contributions to flavour characteristics. It will also unfold research opportunities in the field of nonalcoholic wine production for continual improvement and development of the wine industry.
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Tolosa and Zhang. "The Role of Major Transcription Factors in Solanaceous Food Crops under Different Stress Conditions: Current and Future Perspectives." Plants 9, no. 1 (January 2, 2020): 56. http://dx.doi.org/10.3390/plants9010056.
Full textAbstract:
Plant growth, development, and productivity are adversely affected by environmental stresses such as drought (osmotic stress), soil salinity, cold, oxidative stress, irradiation, and diverse diseases. These impacts are of increasing concern in light of climate change. Noticeably, plants have developed their adaptive mechanism to respond to environmental stresses by transcriptional activation of stress-responsive genes. Among the known transcription factors, DoF, WRKY, MYB, NAC, bZIP, ERF, ARF and HSF are those widely associated with abiotic and biotic stress response in plants. Genome-wide identification and characterization analyses of these transcription factors have been almost completed in major solanaceous food crops, emphasizing these transcription factor families which have much potential for the improvement of yield, stress tolerance, reducing marginal land and increase the water use efficiency of solanaceous crops in arid and semi-arid areas where plant demand more water. Most importantly, transcription factors are proteins that play a key role in improving crop yield under water-deficient areas and a place where the severity of pathogen is very high to withstand the ongoing climate change. Therefore, this review highlights the role of major transcription factors in solanaceous crops, current and future perspectives in improving the crop traits towards abiotic and biotic stress tolerance and beyond. We have tried to accentuate the importance of using genome editing molecular technologies like CRISPR/Cas9, Virus-induced gene silencing and some other methods to improve the plant potential in giving yield under unfavorable environmental conditions.
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Wellock, I. J., G. C. Emmans, and I. Kyriazakis. "Modelling the effects of thermal environment and dietary composition on pig performance: model logic and concepts." Animal Science 77, no. 2 (October 2003): 255–66. http://dx.doi.org/10.1017/s1357729800058999.
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AbstractA deterministic, dynamic pig growth model is described that predicts the effects of genotype and the thermal and nutritional environments on food intake, growth and body composition of growing pigs. From the daily potential for protein gain, as determined by pig genotype and current state, the potential gains of the other chemical components, including ‘desired’ lipid gain, are calculated. Unconstrained voluntary food intake is predicted from the current protein and lipid contents of the pig, and the composition of the food, as that which is needed to permit potential growth to be achieved. The model allows compensatory lipid gain. The composition of the food is described in terms of its digestible energy content (DEC), ideal digestible crude protein content (IDCPC) and bulkiness. Both energy and protein can be limiting resources and the bulk of the food may constrain intake. The animal’s capacity for bulk is a function of its size. The thermal environment is described by the ambient temperature, wind speed, floor type and humidity and sets the maximum (HLmax) and minimum (HLmin) values possible for heat loss. A comparison with heat production (HP) determines whether the environment is hot (HP > HLmax), cold (HP < HLmin) or thermoneutral (HLmin< HP < HLmax). A constraint on intake operates in hot environments, while in cold environments, there is an extra thermal demand. If conditions are thermoneutral no further action is taken. Daily gains of each of the chemical components are calculated by partitioning energy intake between protein and lipid gains according only to the energy to protein ratio of the food. The model builds on the work of others in the literature as it allows predictions on how changes in: (i) the kind of pig; (ii) the animal’s current state, which is particularly relevant in cases of compensatory growth; (iii) the dietary composition, and; (iv) the climatic environment, affect food intake and growth, whilst maintaining simplicity and flexibility.
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Lee, Huey-Lin, Yu-Pin Lin, and Joy Petway. "Global Agricultural Trade Pattern in A Warming World: Regional Realities." Sustainability 10, no. 8 (August 5, 2018): 2763. http://dx.doi.org/10.3390/su10082763.
Full textAbstract:
Global warming, coupled with disparate national population growth projections, could exert significant pressure on food prices, increasing the risk of food insecurity, particularly for net-importing countries. We investigated projected eventualities for a comprehensive set of 133 countries by the year 2030, and identified changes in the global agricultural crop trading pattern, with simulations from a multi-regional computable general equilibrium (CGE) model. We based our model on population growth and temperature scenarios, as per the IPCC fifth assessment report (AR5). Our simulations suggest an increase of 4.9% and 6.4% in global average prices and aggregate export crop volumes, respectively. This global exports expansion requires an increased 4.46% in current global aggregate crop output, since population growth raises demand, and thus, global average crop prices, further aggravating net importing countries’ financial burdens for food acquisition. Conversely, net exporting countries will fare better in the projected scenario due to increased agricultural income, as they are able to increase crop exports to meet the rising global demand and price. The gap in global income distribution widens, given that the majority of developing countries are coincidently located in tropical zones which are projected to experience negative crop yield shocks, while industrialized countries are located in cold and temperate zones projected to have favorable crop yield changes. National and international policy measures aimed at effectively alleviating net importing countries’ food security issues should also consider how global crop yields are geographically and diversely impacted by climate change.
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Wolfgarten, Martin, Dirk Rosenstock, Jan Freitag, and Gerhard Hirt. "Experimental and Numerical Investigation on Controlling the Material Flow in Open-Die Forging through Superimposed Manipulator Displacements." Key Engineering Materials 651-653 (July 2015): 272–77. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.272.
Full textAbstract:
In the past, different methods have been investigated regarding the production of curved workpieces by open-die forging as a significant demand for open-die forged parts with excellent mechanical properties exists. Current ways to produce curved workpieces by open-die forging have the disadvantages of complex preforms and inflexibility. One alternative approach to realize the production of curved workpieces by open-die forging is to actively control the material flow in open-die forging by superimposed manipulator movements during a forging stroke. Since the currently formed material between the forging dies is in a plastic state during the deformation, the required bending forces can be reduced significantly. This concept is investigated in a first study for the cold-forging of an aluminum alloy by numerical simulation and experiments on laboratory scale. For the process, the bite ratio, height reduction and the intended bending angle were identified as most important process parameters. Both numerical and experimental investigation proved the feasibility of the process principle since the bending forces, moments and the bending work can be reduced significantly.