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A Novel Transparent and Auditable Fog-Assisted Cloud Storage with Compensation Mechanism
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作者 Donghyun Kim Junggab Son +3 位作者 Daehee Seo Yeojin Kim Hyobin Kim Jung Taek Seo 《清华大学学报自然科学版(英文版)》 EI CAS CSCD 2020年第1期28-43,共16页
This paper introduces a new fog-assisted cloud storage which can achieve much higher throughput compared to the traditional cloud-only storage architecture by reducing the traffics toward the cloud storage. The fog-st... This paper introduces a new fog-assisted cloud storage which can achieve much higher throughput compared to the traditional cloud-only storage architecture by reducing the traffics toward the cloud storage. The fog-storage service providers are transparency to end-users and therefore, no modification on the end-user devices is necessary. This new system is featured with(1) a stronger audit scheme which is naturally coupled with the proposed architecture and does not suffer from the replay attack and(2) a transparent and efficient compensation mechanism for the fog-storage service providers. We provide rigorous theoretical analysis on the correctness and soundness of the proposed system. To the best of our knowledge, this is the first paper to discuss about a storage data audit scheme for fog-assisted cloud storage as well as the compensation mechanism for the service providers of the fog-storage service providers. 展开更多
关键词 FOG COMPUTING cloud COMPUTING network storage data audit MERKLE hash tree integer FACTORIZATION PAYMENT TRANSPARENCY
广电媒资系统的分级分库存储设计探析 预览
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作者 徐莉 《电视技术》 2019年第6期39-41,共3页
在全媒体时代,媒资内容作为传统媒体的核心竞争力,正引起越来越多的重视。随着5G、4K/8K等技术的迅猛发展,媒资管理系统存储和处理的数据量正呈PB级增长,海量存储、高存取速率和安全性等问题日益凸显,与之相适应的存储解决方案亟待完善... 在全媒体时代,媒资内容作为传统媒体的核心竞争力,正引起越来越多的重视。随着5G、4K/8K等技术的迅猛发展,媒资管理系统存储和处理的数据量正呈PB级增长,海量存储、高存取速率和安全性等问题日益凸显,与之相适应的存储解决方案亟待完善。试以浙江广播电视集团媒资库为例,分析其存储需求,以分级分库角度研究存储方案,可有效缓解存储压力。 展开更多
关键词 媒资 存储 分级分库 存储容量
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Improved hydrogen storage properties of LiBH4 confined with activated charcoal by ball milling
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作者 He Zhou Xin-Hua Wang +2 位作者 Hai-Zhen Liu Shi-Chao Gao Mi Yan 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第4期321-326,共6页
In order to enhance the hydrogen storage properties of LiBH4,activated charcoal (AC) was used as the scaffold to confine LiBH4 in this paper.Ball milling was used to prepare LiBH4/AC composites.Experimental results sh... In order to enhance the hydrogen storage properties of LiBH4,activated charcoal (AC) was used as the scaffold to confine LiBH4 in this paper.Ball milling was used to prepare LiBH4/AC composites.Experimental results show that dehydrogenation properties of ball-milled LiBH4/AC (LiBH4/AC-BM) are greatly improved compared with that of pristine LiBH4,ball-milled LiBH4 (LiBH4-BM) and hand-milled LiBH4/AC (LiBH4/AC-HM).The onset dehydrogenation temperature of LiBH4 for LiBH4/AC-BM is around 160 ℃,which is 170 ℃ lower than that of pristine LiBH4.At around 400 ℃,LiBH4/AC-BM finishes the dehydrogenation with a hydrogen capacity of 13.6 wt%,which is approximately the theoretical dehydrogenation capacity of pure LiBH4 (13.8 wt%),while the dehydrogenation processes for LiBH4-BM and LiBH4/AC-BM do not finish even when they were heated to 600 ℃.The isothermal dehydriding measurements show that it takes only 15 min for LiBH4/AC-BM to reach a dehydrogenation capacity of 10.1 wt% at 350 ℃,whereas the pristine LiBH4 and the LiBH4/AC-HM release hydrogen less than 1 wt% under the same conditions.The dehydrogenation process and the effect of AC were discussed. 展开更多
关键词 HYDROGEN STORAGE properties HYDROGEN STORAGE materials LITHIUM BOROHYDRIDE Activated charcoal
A Privacy-Preserving TPA-aided Remote Data Integrity Auditing Scheme in Clouds 预览
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作者 Meng Zhao Yong Ding +3 位作者 Yujue Wang Huiyong Wang Bingyao Wang Lingang Liu 《国际计算机前沿大会会议论文集》 2019年第1期342-345,共4页
The remote data integrity auditing technology can guarantee the integrity of outsourced data in clouds. Users can periodically run an integrity auditing protocol by interacting with cloud server, to verify the latest ... The remote data integrity auditing technology can guarantee the integrity of outsourced data in clouds. Users can periodically run an integrity auditing protocol by interacting with cloud server, to verify the latest status of outsourced data. Integrity auditing requires user to take massive time-consuming computations, which would not be affordable by weak devices. In this paper, we propose a privacy-preserving TPA-aided remote data integrity auditing scheme based on Li et al.’s data integrity auditing scheme without bilinear pairings, where a third party auditor (TPA) is employed to perform integrity auditing on outsourced data for users. The privacy of outsourced data can be guaranteed against TPA in the sense that TPA could not infer its contents from the returned proofs in the integrity auditing phase. Our construction is as efficient as Li et al.’s scheme, that is, each procedure takes the same time-consuming operations in both schemes, and our solution does not increase the sizes of processed data, challenge and proof. 展开更多
关键词 Cloud STORAGE INTEGRITY AUDITING Provable Data POSSESSION PROOFS of STORAGE PROOFS of Retrievability
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Evaluation of Correlation between Acid Degree Value and Peroxide Value in Lipolysis of Control and Iron Fortified Caprine Milk Cheeses during 4 Months Storage 预览
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作者 Aftab Siddique Young W. Park 《动物科学期刊(英文)》 2019年第1期1-11,共11页
Elevation of acid degree values (ADV) and peroxide value (POV) indicates deterioration of nutritional and sensory qualities of dairy products during storage. Iron fortification in bovine milk cheeses in relation to li... Elevation of acid degree values (ADV) and peroxide value (POV) indicates deterioration of nutritional and sensory qualities of dairy products during storage. Iron fortification in bovine milk cheeses in relation to lipolytic parameters and their correlations have been studied, while no such studies have been reported on caprine milk cheeses. The objectives of this study were to evaluate levels of ADV and POV of iron fortified [regular ferrous sulfate (RFS) and large microencapsulated ferrous sulfate (LMFS)] goat milk Cheddar cheeses compared to those of non-fortified control cheese (CC) and their correlations. Three batches of 3 types (CC, RFS and LMFS added) of goat milk cheeses were manufactured and stored at two temperatures (4&deg;C and -18&deg;C) for 0, 2 and 4 months. Iron was supplemented to RFS and LMFS cheeses by 8.23 g and 9.03 g per 9 kg, respectively. ADV and POV were determined using standard methods of examining dairy products (Richardson, 1985) and AOCS (1975) procedures. Results showed that ADV values for CC, RFS and LMFS cheeses for 0 and 4 month storage at 4&deg;C were: 0.67, 0.73, 0.64;1.24, 1.78, 1.58, respectively, indicating significant (P < 0.05) elevations occurred in ADV for all three cheeses during 4 months storage. The cheese samples at 4 months storage showed significantly (P < 0.05) higher peroxide values compared to 0 and 2 month stored ones. The samples stored at refrigeration temperature (4&deg;C) revealed slightly more lipid oxidation than those stored at frozen temperature (-18&deg;C). Significant (P < 0.05) elevations in POV for all goat cheeses stored for 4 months and slight increases in POV at higher temperature implies that the longer time and higher temperature storage can elevate the rate of lipid oxidation in goat milk Cheddar cheeses. Correlations (r) between ADV and POV for the pooled data of three types of the caprine cheeses across storage periods were significant (P < 0.01), while r values of CC cheeses alone were negative. It was concluded that significant correlatio 展开更多
关键词 CAPRINE Milk Cheese STORAGE IRON Fortification ADV POV CORRELATION
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Carbon storage of a subtropical forest ecosystem: a case study of the Jinggang Mountain National Nature Reserve in southeastern China 预览
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作者 Jiping Zhang Linbo Zhang +2 位作者 Haiguang Hao Chunlan Liu Hui Wang 《林业研究:英文版》 CAS CSCD 2019年第3期1011-1021,共11页
The carbon cycle of forest ecosystems plays a key role in regulating CO2 concentrations in the atmosphere. Research on carbon storage estimation of forest ecosystems has become a major research topic. However, carbon ... The carbon cycle of forest ecosystems plays a key role in regulating CO2 concentrations in the atmosphere. Research on carbon storage estimation of forest ecosystems has become a major research topic. However, carbon budgets of subtropical forest ecosystems have received little attention. Reports of soil carbon storage and topographic heterogeneity of carbon storage are limited. This study focused on the Jinggang Mountain National Nature Reserve as an example of a mid-subtropical forest and evaluated soil and vegetation carbon storage by field sampling combined with GIS, RS and GPS technology. We classified the forest into nine forest types using ALOS high-resolution remote sensing images. The evergreen broad-leaved forest has the largest area, occupying 26.5% of the total area, followed by coniferous and broad-leaved mixed forests and warm temperate coniferous forest, occupying 24.2 and 22.9%, respectively. The vegetation and soil carbon storage of the whole forest ecosystem were 1,692,344 and 5,514,707 t, with a carbon density of 7.4 and 24.2 kg/m^2, respectively, which suggests that the ecosystem has great carbon storage capacity. The topographic heterogeneity of the carbon storage was also analysed. The largest vegetation storage and soil storage is at 700–800 and 1000–1100 m, respectively. The vegetation carbon storage is highest in the southeast, south and southwest. 展开更多
关键词 Vegetation CARBON STORAGE Soil CARBON STORAGE Mid-subtropical forest ecosystem Jinggang MOUNTAIN National Nature Reserve
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Germination pretreatment and storage behavior of Terminalia laxiflora seed 预览
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作者 Befkadu Mewded Debissa Lemessa +1 位作者 Hailu Negussie Abiyot Berhanu 《林业研究:英文版》 CAS CSCD 2019年第4期1337-1342,共6页
Terminalia laxiflora Engl.&Diels.is an important indigenous and multi-purpose species in Ethiopia.However threatened due to low germination and its storage behavior is unknown.In this study,we aimed to(1)test pret... Terminalia laxiflora Engl.&Diels.is an important indigenous and multi-purpose species in Ethiopia.However threatened due to low germination and its storage behavior is unknown.In this study,we aimed to(1)test pretreatments for breaking the dormancy of T.laxiflora seed and(2)determine its storage behavior.Seeds were subjected to four pretreatments such as soaking,scarification,high-temperature,and control.Experiments were done before storage and after 2 years of dry storage at cold temperature(-10℃)based on randomized design with four replicates.The first round of experimental results showed that T.laxiflora seeds with high temperature treatments at 78℃for 10 min showed significantly higher germination percentage(80%).In the second round experiment,high-temperature treatment at 78℃for15 min,cold water soaking,high-temperature treatment at78℃for 10 min,hot water soaking,and high-temperature treatment at 78℃for 5 min showed significantly higher germination percentage from the remaining treatments(75,64,58,56,and 53%,respectively).To break the dormancy of T.laxiflora seed and attain good germination result,seeds should be pretreated with high-temperature at 78℃for 10 min to test the initial germination before storage and should be pretreated with high-temperature(at 78℃for15,10,or 5 min),soaked in cold,or hot water for 24 h to monitor the germination after storage.The two experiments show that T.laxiflora produces orthodox seed. 展开更多
关键词 DORMANCY BREAKING Dry STORAGE High-temperature SOAKING STORAGE behavior
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1980s-2010s中国陆地生态系统土壤碳储量的变化
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作者 徐丽 于贵瑞 何念鹏 《地理学报:英文版》 SCIE CSCD 2019年第1期49-66,共18页
Soil stores a large amount of the terrestrial ecosystem carbon(C) and plays an important role in maintaining global C balance. However, very few studies have addressed the regional patterns of soil organic carbon(SOC)... Soil stores a large amount of the terrestrial ecosystem carbon(C) and plays an important role in maintaining global C balance. However, very few studies have addressed the regional patterns of soil organic carbon(SOC) storage and the main factors influencing its changes in Chinese terrestrial ecosystems, especially using field measured data. In this study, we collected information on SOC storage in main types of ecosystems(including forest, grassland, cropland, and wetland) across 18 regions in China during the 1980 s(from the Second National Soil Survey of China, SNSSC) and the 2010 s(from studies published between 2004 and 2014), and evaluated its changing trends during these 30 years. The SOC storage(0–100 cm) in Chinese terrestrial ecosystems was 83.46 ± 11.89 Pg C in the 1980 s and 86.50 ± 8.71 Pg C in the 2010 s, and the net increase over the 30 years was 3.04 ± 1.65 Pg C, with an overall rate of 0.101 ± 0.055 Pg C yr–1. This increase was mainly observed in the topsoil(0–20 cm). Forests, grasslands, and croplands SOC storage increased 2.52 ± 0.77, 0.40 ± 0.78, and 0.07 ± 0.31 Pg C, respectively, which can be attributed to the several ecological restoration projects and agricultural practices implemented. On the other hand, SOC storage in wetlands declined 0.76 ± 0.29 Pg C, most likely because of the decrease of wetland area and SOC density. Combining these results with those of vegetation C sink(0.100 Pg C yr–1), the net C sink in Chinese terrestrial ecosystems was about 0.201 ± 0.061 Pg C yr–1, which can offset 14.85%–27.79% of the fossil fuel C emissions from the 1980 s to the 2010 s. These first estimates of soil C sink based on field measured data supported the premise that China’s terrestrial ecosystems have a large C sequestration potential, and further emphasized the importance of forest protection and reforestation to increase SOC storage capacity. 展开更多
关键词 Chinese TERRESTRIAL ECOSYSTEMS CHANGE storage soil ORGANIC carbon
Sizing Method of a Storage System for Determining the Performance of a Photovoltaic Pumping System over the Sun 预览
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作者 Mohamed Elmamy Mohamed Mahmoud Mr. Soukeyna +2 位作者 A. Yahfdhou A. K. Mahmoud I. Youm 《智能电网与可再生能源(英文)》 2019年第2期17-28,共12页
The use of renewable energy is growing significantly in the world. In front of the growing demand for electric energy, essentially for the needs of remote, isolated and mountainous regions, photovoltaic systems, espec... The use of renewable energy is growing significantly in the world. In front of the growing demand for electric energy, essentially for the needs of remote, isolated and mountainous regions, photovoltaic systems, especially water pumping systems, are beginning to emerge in large applications. In this sense, the proposed study deals with the problem of the water level regulation in the photovoltaic pumping system. It is in this context that the interest in this paper is dictated by the need to use an existing energy source on the site. Still in this light, it is important to note that, often, the calculation of the size of the GPV that feeds the pumping system and the pump involves a certain degree of uncertainty, mainly due to two main reasons: the first is related to randomness of solar radiation which is often little known and the second is related to the difficulty to estimate the water needs. This is why, on the one hand, the realization of such a system has made it possible to show the possibility of determining the projected quantity for water storage. Similarly, it has shown that the prediction of this quantity of water can be calculated by a simple analytical method based on numerical computation. Thus, it was also shown for this pumping system, thanks to graphical analysis methods, developing autonomy, reliability and good performance. In this sense, this experience opens the door for a practical and economical solution to the problem of lack of water, especially in our regions. Measurements made on the studied system prove that the designed approach improves the efficiency. Finally, it is also expected to draw further conclusions for the operation of these systems in similar sites. 展开更多
关键词 Water PUMPING PV Storage OUTPUT
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一种基于HDD-SSD混合的Mesos存储优化方法 预览
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作者 刘文斌 胡亮青 +3 位作者 张汉林 薛逸君 卢煜 陈宁江 《广西大学学报:自然科学版》 CAS 北大核心 2019年第2期433-439,共7页
在分析Mesos持久化存储原理的基础上,提出一种基于HDD-SSD混合存储的Mesos系统持久化存储优化方案。它为了解决HDFS频繁读写带来的I/O性能问题,将HDD-SSD混合存储的HDFS作为Mesos持久化层,并对内存冷页面迁出策略进行了优化。实验结果表... 在分析Mesos持久化存储原理的基础上,提出一种基于HDD-SSD混合存储的Mesos系统持久化存储优化方案。它为了解决HDFS频繁读写带来的I/O性能问题,将HDD-SSD混合存储的HDFS作为Mesos持久化层,并对内存冷页面迁出策略进行了优化。实验结果表明,所提出的方法不仅可以提高基于Mesos的系统I/O性能,而且能保证SSD的利用率,节省SSD的成本开销。 展开更多
关键词 存储 优化 混合存储 持久化
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Production of Clay Containers for Curbing Plantain Post-Harvest Losses in Ghana 预览
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作者 Kofi Asante-Kyei Alexander Addae Mercy Abaka-Attah 《玻璃与陶瓷期刊(英文)》 2019年第3期50-65,共16页
In Ghana, most farmers are peasants and at times foodstuffs produced get rotten either through transportation or market places. This normally affects the meager income that farmers earn through hard work. Available st... In Ghana, most farmers are peasants and at times foodstuffs produced get rotten either through transportation or market places. This normally affects the meager income that farmers earn through hard work. Available statistics indicate that each year, food crops worth several hundreds of dollars go waste in the country due to poor harvest losses and it represents 70% of total food production in Ghana. Again, in the country, there is abundant of clay as a natural resource. Geological study has revealed that it is found in almost every part of the country. As a means of finding solution to the rate at which local foodstuffs especially plantain rot, the study sought to design and compose clay container purposefully for storing plantain to prolong its lifespan. The study focused on 5 clay body compositions (C1 to C5) and fired at 950°C. Composition C1?consisted of 50% of Abonko clay and 50% of Daboase clay. Composition C2 was made up of 40% Abonko clay, 50% Daboase clay and 10% of smooth sawdust. Composition C3 composed of 45% of Abonko clay, 45% of Daboase clay and 10% of smooth sawdust. Composition C4 was made up of 90% Daboase clay and 10% rough sawdust. The last composition C5 comprised mainly 100% Abonko clay. Fresh plantains obtained from Takoradi market circle were stored in the containers and weekly recordings of states of plantain for five consecutive weeks were carried out. It was revealed that C4 was successful in storing fresh plantains to ripe stage after the five weeks. It is recommended among others that, the technique should be made available to stakeholders such as Ministry of Food and Agriculture (MOFA), plantain farmers and market plantain sellers through seminars, public education and symposia in order to minimize post-harvest losses. 展开更多
关键词 CLAY Containers PLANTAIN STORAGE
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动态温湿度条件下糙米主要储藏品质指标变化 预览
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作者 刘欣 姚远航 +3 位作者 陈文若 顾佳缘 王琰 陈银基 《食品科学》 EI CAS CSCD 北大核心 2019年第3期245-250,共6页
目的:本实验通过研究温湿度动态变化条件下糙米储藏过程中主要生理生化指标的变化,为优化糙米安全储藏条件提供基础数据。方法:将初始水分质量分数分别为15%、17%、19%和21%的糙米,分别在低温动态组(L组)、中温动态组(M组)、高温动态组(... 目的:本实验通过研究温湿度动态变化条件下糙米储藏过程中主要生理生化指标的变化,为优化糙米安全储藏条件提供基础数据。方法:将初始水分质量分数分别为15%、17%、19%和21%的糙米,分别在低温动态组(L组)、中温动态组(M组)、高温动态组(H组)3种不同温湿度动态条件下模拟储藏240d,观测糙米发芽率、脂肪酸值、过氧化氢酶活力等主要品质指标和低场核磁共振水分迁移规律的变化。结果:在240d的储藏过程中,随着储藏时间的延长,发芽率、过氧化氢酶活力呈显著下降趋势,脂肪酸值呈先上升后下降的趋势,糙米品质发生劣变。初始水分质量分数高的糙米其自由水的质量分数要高于初始水分质量分数低的糙米;高温会引起水分迁移混乱,吸附水向自由水迁移,自由水质量分数升高。水分质量分数越高、温度越高,糙米就越容易发生霉变变质。储藏温度对发芽率、脂肪酸值、过氧化氢酶活力有显著影响,初始水分质量分数对发芽率、脂肪酸值有显著影响。结论:初始水分质量分数和储藏温度对糙米的品质特性影响显著。为防止糙米发生品质劣变,正常水分(质量分数15%)和偏高水分(质量分数17%、19%)的糙米安全储藏期为120d,低温或中温可以延长正常水分糙米储藏期至180d。 展开更多
关键词 糙米 储藏 温湿度动态变化 储藏特性
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Tap Water versus Bottled Water: A Pilot Study 预览
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作者 Ryan Knox Rodney McDermott 《水资源与保护(英文)》 2019年第11期1398-1407,共10页
The aim of this exploratory research and comparative numerical pilot study was to investigate any significant differences in the microbiological content of tap and bottled water through the measurement of risk indicat... The aim of this exploratory research and comparative numerical pilot study was to investigate any significant differences in the microbiological content of tap and bottled water through the measurement of risk indicator parameters including Enterococci, Escherichia coli (E. coli) and colony-forming units (CFUs). This study to investigate storage conditions and compare consumer options of public water supply and bottled water using microbiological limits was carried out for public health research. This was a unique pilot study to Northern Ireland with global relevance due to the increase in the bottled water market and the need to address the lack of consumer awareness regarding storage and microbiological content. No E. coli or Enterococci were found in any of the 31 tap or bottled water samples. Three unrefrigerated bottled water samples exceeded the threshold in Colony Counts 22°C & 37°C (degrees Celsius) and failed in line with Drinking Water Directive guidelines. This indicated a link between storage conditions and microbiological quality. No link between prices or microbiological quality was indicated. This research recommends the creation of a regulator for the bottled water industry, the need for clearly labelled microbiological content and daily testing. Water suppliers such as Northern Ireland (NI) Water should promote the quality of tap water. Recommendations are also outlined for consumers. There is no statistically significant difference in the microbiological quality of tap and bottled water in Northern Ireland despite marketing claims. 展开更多
关键词 Water TAP BOTTLED PUBLIC HEALTH Storage MICROBIOLOGICAL Regulation
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Design and Operational Strategy Research for Temperature Control Systems of Isothermal Compressed Air Energy Storage Power Plants
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作者 FU Hao JIANG Tong +1 位作者 CUI Yan LI Bin 《热科学学报:英文版》 SCIE EI CAS CSCD 2019年第2期204-217,共14页
Energy storage technology is critical for intelligent power grids. It has great significance for the large-scale integration of new energy sources into the power grid and the transition of the energy structure. Based ... Energy storage technology is critical for intelligent power grids. It has great significance for the large-scale integration of new energy sources into the power grid and the transition of the energy structure. Based on the existing technology of isothermal compressed air energy storage, this paper presents a design scheme of isothermal compressed air energy storage power station, which uses liquid to compress air, hydraulic piston to transfer potential energy, hydraulic turbine to generate electricity at constant pressure, and liquid occupancy to store the gas at constant pressure. Then the technical features and control strategies of its internal temperature control subsystem are studied, and the mathematical model is constructed. A hierarchical relay operation is put forward to address the actual construction and operational requirements of compressed air energy storage power plants. Finally, through physical platform experiments and MATLAB simulation, the feasibility of the design is validated. 展开更多
关键词 HIERARCHICAL RELAY operation ISOTHERMAL compression compressed air ENERGY STORAGE power PLANT ENERGY STORAGE
杯装保健酒外壁防霉处理研究 预览
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作者 谢素琴 《粮食科技与经济》 2019年第2期59-62,共4页
本文研究了杯装保健酒(以虫草巴戟酒为例)在储藏过程中的霉菌污染问题,从各种表面活性剂中,筛选出十二烷基甜菜碱(BS-12,十二烷基二甲基胺乙内酯),采用0.5%~1.1%的BS-12清洗液,可有效防止杯装虫草巴戟酒酒杯外壁被霉菌污染。其中采用0.9... 本文研究了杯装保健酒(以虫草巴戟酒为例)在储藏过程中的霉菌污染问题,从各种表面活性剂中,筛选出十二烷基甜菜碱(BS-12,十二烷基二甲基胺乙内酯),采用0.5%~1.1%的BS-12清洗液,可有效防止杯装虫草巴戟酒酒杯外壁被霉菌污染。其中采用0.9%的BS-12清洗液,浸泡包装好的杯装虫草巴戟酒15min,为有效的防霉处理措施。 展开更多
关键词 防霉措施 十二烷基甜菜碱 杯装虫草巴戟酒 储藏
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粒径对好氧颗粒污泥储存稳定性的影响 预览
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作者 张立楠 张斌超 +6 位作者 刘祖文 宣鑫鹏 程媛媛 龙焙 邢雨 兰鑫 曾敏静 《化工进展》 EI CAS CSCD 北大核心 2019年第7期3450-3457,共8页
研究了混合粒径与不同粒径好氧颗粒污泥(AGS)在储存过程中的三维结构、质量变化、微生物活性以及理化特性的变化规律。经过室温(16~25℃)下31天的储存,污泥的三维结构均保持较好,未出现明显解体现象。混合粒径的AGS在储存前20天,其质量... 研究了混合粒径与不同粒径好氧颗粒污泥(AGS)在储存过程中的三维结构、质量变化、微生物活性以及理化特性的变化规律。经过室温(16~25℃)下31天的储存,污泥的三维结构均保持较好,未出现明显解体现象。混合粒径的AGS在储存前20天,其质量和比耗氧速率(SOUR)下降缓慢,胞外聚合物(EPS)先减小后上升。20天之后由于厌氧菌在竞争中逐渐占得优势,其质量减小了46.3%,EPS与SOUR分别下降69.0%和72.7%,导致稳定性随之下降。不同粒径AGS经过储存后,其颜色仍为橙黄色且结构完整;1~2mm和3~4mm粒径的AGS质量减小(分别为49.1%和53.9%)较大,且SOUR和EPS下降了亦较大;0.3~1mm粒径的AGS质量减小较少,EPS下降较少,但SOUR下降幅度较大,而2~3mm粒径的质量仅减小了33.7%、SOUR下降幅度最小(39.8%),EPS下降幅度也相对较小(58.7%),表明其在储存过程中能保持较好的活性与稳定性。 展开更多
关键词 好氧颗粒污泥 粒径 包埋 储存 稳定性
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Pumped hydro energy storage and 100 % renewable electricity for East Asia
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作者 Cheng Cheng Andrew Blakers +1 位作者 Matthew Stocks Bin Lu 《全球能源互联网:英文版》 2019年第5期387-393,共7页
Rapid cost reductions have led to the widespread deployment of renewable technologies such as solar photovoltaics(PV)and wind globally.Additional storage is needed when the share of solar PV and wind in electricity pr... Rapid cost reductions have led to the widespread deployment of renewable technologies such as solar photovoltaics(PV)and wind globally.Additional storage is needed when the share of solar PV and wind in electricity production rises to 50–100%.Pumped hydro energy storage constitutes 97%of the global capacity of stored power and over 99%of stored energy and is the leading method of energy storage.Off-river pumped hydro energy storage options,strong interconnections over large areas,and demand management can support a highly renewable electricity system at a modest cost.East Asia has abundant wind,solar,and off-river pumped hydro energy resources.The identified pumped hydro energy storage potential is 100 times more than required to support 100%renewable energy in East Asia. 展开更多
关键词 Photovoltaics Wind energy Pumped hydro energy storage 100% renewable energy
All-carbon hybrids for high-performance electronics,optoelectronics and energy storage
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作者 Shuchao QIN Yuanda LIU +4 位作者 Hongzhu JIANG Yongbing XU Yi SHI Rong ZHANG Fengqiu WANG 《中国科学:信息科学(英文版)》 SCIE EI CSCD 2019年第12期91-114,共24页
The family of carbon allotropes such as carbon nanotubes(CNTs) and graphene, with their rich chemical and physical characteristics, has attracted intense attentions in the field of nanotechnology and enabled a number ... The family of carbon allotropes such as carbon nanotubes(CNTs) and graphene, with their rich chemical and physical characteristics, has attracted intense attentions in the field of nanotechnology and enabled a number of disruptive devices and applications in electronics, optoelectronics and energy storage.Just as no individual 2 D(two-dimensional) material can meet all technological requirements of various applications, combining carbon materials of different dimensionality into a hybrid form is a promising strategy to optimize properties and to build novel devices operating with new principles. In particular, the direct synthesis of 2 D or 3 D(three-dimensional) sp2-hybridized all-carbon hybrids based on merging CNTs and graphene affords a great promise for future electronic, optoelectronic and energy storages. Here, we review the progress of all-carbon hybrids-based devices, covering material preparation, fabrication techniques as well as applied devices. Recent progress about large-scale synthesis and assembly techniques is highlighted,and with many intrinsic advantages, the all-carbon strategy opens up a highly promising approach to obtain high-performance integrated circuits. Moreover, this review will discuss the remaining challenges in the field and provide perspectives on future applications. 展开更多
关键词 all-carbon hybrids ELECTRONICS OPTOELECTRONICS energy storage graphene carbon nanotube
空间信息网络分布式存储方案研究 预览
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作者 张平 赵晶 +2 位作者 虞志刚 薛斯达 陆洲 《中国电子科学研究院学报》 北大核心 2019年第3期256-264,共9页
随着空间组网和信息技术的发展,传统的卫星信息系统开始朝着网络化的空间信息网络演进,并具备了星上信息处理和存储的能力。为此,本文提出了一种基于空间分布式存储的空间信息系统方案。与基于地面存储的信息系统相比,通过在空间引入存... 随着空间组网和信息技术的发展,传统的卫星信息系统开始朝着网络化的空间信息网络演进,并具备了星上信息处理和存储的能力。为此,本文提出了一种基于空间分布式存储的空间信息系统方案。与基于地面存储的信息系统相比,通过在空间引入存储资源,该方案在信息获取时效性和空间带宽资源效率方面有明显提升。仿真结果显示,空间信息存储方案相比地面存储方案,信息的平均接收时间从424毫秒缩短到4. 4毫秒,而空间带宽资源消耗节省了将近99%。 展开更多
关键词 空间信息网络 分布式 存储 复制 编码
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One-step Production of Continuous Supercapacitor Fibers for a Flexible Power Textile
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作者 Yang Hong Xun-Liang Cheng +5 位作者 Ge-Jun Liu Dong-Sheng Hong Si-Si He Bin-Jie Wang Xue-Mei Sun Hui-Sheng Peng 《高分子科学:英文版》 SCIE CAS CSCD 2019年第8期737-743,共7页
Given that conventional bulky electrochemical energy storage devices are too rigid and heavy to be considered wearable,developing fully integrated power systems is expected to accelerate the successful commercializati... Given that conventional bulky electrochemical energy storage devices are too rigid and heavy to be considered wearable,developing fully integrated power systems is expected to accelerate the successful commercialization of smart electronic textiles.Although great achievements have been made for fiber-shaped energy storage devices, there remain key challenges pertaining to their fabrication efficiency, scalability, and stability. Herein, a general and highly efficient method is developed to continuously fabricate supercapacitor fibers with lengths of kilometers at high production rate up to 118 m/h through a simple one-step wet spinning method.Beneficial from the designed unique two-circle-in-one-circle architecture, the resulting supercapacitor fibers demonstrated high electrochemical stability even after being bended for 1 × 10~5 cycles. As a demonstration, these continuous supercapacitor fibers were further woven into a flexible power scarf for large-scale applications in wearable electronics. This simple and scalable fabrication process combined with the unique structure provides a general and effective paradigm to design other fiber-shaped devices like sensors, batteries,and solar cells. 展开更多
关键词 CONTINUOUS PRODUCTION WET-SPINNING Fiber-shaped SUPERCAPACITORS Energy storage fabric
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