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Microstructure and magnetic properties of(SmCo+FeCo)/NdFeB multicomponent nanocomposite magnets fabricated by HPTC with change in heating temperature and composition

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Journal of Rare Earths 2020年第7期38卷 742-748,I0003页

作者： guangwei huang Li Lou Wenpeng Song Ming Li Fuchen Hou Xiaohong Li State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China College of Materials Science and Engineering Hebei University of EngineeringHandan 056038China

We report the fabrication of bulk anisotropic(SmCo+FeCo)/NdFeB multicomponent nanocomposite magnets using high-pressure thermal compression(HPTC).The correlations among microstructure,magnetic properties,heating temperature and composition of the HPTC nanocomposite magnets were *** HPTC magnet made under variable temperatures(VT),with 19 wt% of FeCo phase,exhibits a maximum energy product of 32 MGOe,which is much higher than that(14 MGOe) for the HPTC magnet made under a constant temperature(CT).When the FeCo content increases to^23 wt%,the HPTC magnet made under VT still remains a high energy product of about 25 *** increasing NdFeB content,the(SmCo+FeCo)/NdFeB multicomponent nanocomposite magnets exhibit an enhanced magnetic anisotropy and *** work is beneficial to fabricating high-performance and low-cost permanent magnets for practical applications.

关键词： Nanocomposite magnets Bulk nanostructures Anisotropy Texture Rare earths

Dual Behavior of Suspended Sediment Concentration in a Regulated River

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World Journal of Mechanics 2011年第3期1卷 115-121页

作者： guangwei huang 不详

Better understanding of suspended sediment transport processes allows for better management of both rivers and coasts. Based on field data and sediment transport energy theory, this study presents an analysis on the suspended sediment hysteresis in the Lower Tenryu River of Japan in connection to the channel carrying capacity of suspended sediment and morphological characteristics. The transport of suspended sediment in the river exhibited dual behaviors according to the magnitude of flood. It was transport-limited in a 10-year flood while supply-limited in a 30-year flood. In the supply-limited case, the temporal variation of suspended sediment concentrations followed the hydrograph well. In the transport-limited case, however, there was a time lag between peak discharge and maximum suspended sediment concentration. The mechanism of time lag was further clarified to be different for the 10-year flood and a small flood. The objective of this paper is to shed some new light on the relationship of suspended sediment to flow and channel conditions.

关键词： Suspended Sediment Concentration Hysteresis Carrying Capacity Transport-Limited Supply-Limited

Planning for Integrative Management of Wastewater Disposal, Irrigation Water Supply and Fertilizer Use: A Case Study in an Arid Land of China

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Journal of Water Resource and Protection 2017年第5期9卷 482-492页

作者： guangwei huang Graduate School of Global Environmental Studies Sophia University Tokyo Japan

This work is a trans-disciplinary undertaking aiming at innovative water management in arid and semi-arid regions. Based on field studies on soil bacterial communities and irrigation water quality in an arid region of China where wastewater has been used for agricultural production decade long, this paper is intended to propose an integrative management scheme combining wastewater reuse in agriculture, wise use of wetlands and fertilizer management as an engine toward achieving sustainable development in arid and semi-arid regions. This study was also designed to address a key but very much neglected question about wastewater reuse in irrigation: does wastewater irrigation lead to reduction of chemical fertilizer use and increase of crop yield? Through a questionnaire, it revealed that there was a misperception among farmers about wastewater, which led to no-reduction or even increase in fertilizer use with wastewater irrigation as compared with river water irrigation. It also showed that crop yield was not increased with wastewater irrigation under the current practice. Besides, it sheds some light on an underreported health concern.

关键词： Arid Regions Wastewater Irrigation Fertilize Use Crop Yield Soil Bacterial

Characterization of Nitrate Contamination in an Arid Region of China

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Journal of Environmental Protection 2013年第7期4卷 46-52页

作者： guangwei huang Graduate School of Global Environmental Studies Sophia University Tokyo Japan.

There are two pathways for nitrate to enter into human body: drinking water and food. Therefore, nitrate contamination of drinking water and agricultural crops is of particular interest to governments and the general public owing to the possible implications for health. This work investigated nitrate contents in various crops and in different parts of each crop and in drinking water as well in the Zhangye Basin, Northwest China. It provided evidence of severe nitrate contamination of drinking water, especially, in vegetable-growing villages. As to the nitrate contamination of crops, the present study revealed that all sampled crops adjust their nitrate distributions in a way that the edible parts contain much less nitrate than non-edible parts except lettuce. The nitrate content in the edible root of lettuce reached up to 5900 mg/kg exceeding the limit set by the European Commission.

关键词： Nitrate Contamination Drinking Water Crops Zhangye Basin

Breeding Habitat Use of Little Tern along Enshunada Coast-Tenryu River Continuum in Relation to Dam Development

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Journal of Environmental Protection 2015年第3期6卷 204-214页

作者： guangwei huang Graduate School of Global Environmental Studies Sophia University Tokyo Japan

Breeding habitat of the Little Tern in a coast-river continuum was studied in relation to dam development. A habitat shift from coast to river occurred decades after dam construction as the dam-caused coastal erosion became manifested. On the other hand, the riverine habitat was affected by dam both positively and negatively. The positive aspect is the reduction of inundation risk for the habitat, and the negative effect is the vegetation development on the habitat. As a result, the bird did not abandon the riverine habitat although its physical characteristics may be considered as suboptimal. In addition, reasoning was given to explain why an artificially created habitat was not used by the bird. A general message resulting from this study is that species adaptive behaviors should be taken into consideration in assessing environmental impacts caused by human activities such as dam development.

关键词： Little Tern Riverine Habitat Coastal Habitat Dam Erosion Vegetation

Utilization of almond residues

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International Journal of Agricultural and Biological Engineering 2010年第4期3卷 1-18页

作者： Paul Chen Yanling Cheng Shaobo Deng Xiangyang Lin guangwei huang Roger Ruan Center for Biorefining Department of Bioproducts and Biosystems EngineeringUniversity of Minnesota1390 Eckles AvenueSt.PaulMN 55108USA College of Biological Science and Technology Fuzhou UniversityFuzhou 350108China Almond Board of California ModestoCaliforniaUSA State Key Laboratory of Food Science and Technology Engineering Research Center for Biomass ConversionMinistry of EducationNanchang UniversityNanchang 330047China

Almond production generates millions of tons of residues in addition to almond *** residues,including shells,hulls,pruning,leaves,skin and inedible kernel disposition,are good feedstocks for production of bioenergy and other valuable *** this article,research on the utilization of almond residues as energy and non-energy feedstocks is *** options for converting almond residues to energy and other valuable products are *** commercial conversion technologies are *** for further research and development are recommended.

关键词： activated carbons almond anti-oxidants bioenergy biomass biorefinery gasification heat power pyrolysis

基于多源数据多决策模型定量分析民俗文化旅游发展影响因素及对策——以陕西省咸阳市袁家村为例

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林业经济 2021年第12期43卷 77-92页

作者：狄东睿 guangwei huang 上智大学日本东京102-8554 咸阳师范学院咸阳712000

民俗文化旅游是我国乡村振兴战略和黄河流域高质量发展的重要组成部分。当前,黄河流域高质量发展与乡村振兴战略全面实施,民俗文化旅游作为助推乡村振兴的重要生态手段,与其相关的研究亟待开展。陕西省袁家村位于黄河流域关中平原,是国... 详细信息

民俗文化旅游是我国乡村振兴战略和黄河流域高质量发展的重要组成部分。当前,黄河流域高质量发展与乡村振兴战略全面实施,民俗文化旅游作为助推乡村振兴的重要生态手段,与其相关的研究亟待开展。陕西省袁家村位于黄河流域关中平原,是国内影响较大的民俗文化旅游典型示范村。文章采用SWOT分析与QSPM模型结合的方法,从优势(S)、劣势(W)、机会(O)、威胁(T)四个维度对陕西袁家村民俗文化旅游产业的影响进行定量化研究,并从不同影响因素的重要性及其活动强度两个方面对各个因子进行量化,同时对提出的发展战略进行量化评估。研究结果表明,袁家村民俗旅游发展外部因素影响得分为3.50,内部因素影响得分为3.45,外部因素影响大于内部因素影响;优势得分为2.40,劣势得分为1.05,机会得分为1.95,威胁得分为1.55,表明优势影响大于劣势,机会影响大于威胁。在六项发展战略中,"把握民俗文化旅游核心价值,推动特色品牌发展"得分最高,为5.45。基于此,文章提出袁家村应注重地方特色品牌的打造与推广,以解决经济发展过程中的同质化竞争、目标人群定位不明确以及环境问题,并从利用新媒体、创新营销模式、借智引才、深挖文创等方面进行改进。

关键词：黄河流域乡村振兴民俗文化旅游 SWOT分析 QSPM模型

Characterization of Soil Bacterial Diversity in Relation to Irrigation Water: A Case Study in China

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Journal of Water Resource and Protection 2016年第12期8卷 1090-1102页

作者： guangwei huang W. Saki Takahashi Huan Liu Tamao Saito Nobutada Kimura Graduate School of Global Environmental Studies Sophia University Tokyo Japan Faculty of Science and Technology Sophia University Tokyo Japan Bioproduction Research Institute National Institute of Advanced Industrial Science and Technology Tsukuba Japan

Use of wastewater for irrigation has become indispensable worldwide due to accelerating water scarcity, and it also carries a social dimension of poverty reduction in developing countries. However, the impacts of wastewater irrigation on soil properties are still insufficiently understood, especially with regard to change in soil microbial community characteristics. The present study presents an assessment of soil bacterial communities subjecting to different irrigation waters. We conducted soil sampling in farmlands irrigated with wastewater, river water and groundwater respectively in an arid region of China and performed a metagenomic survey of microbial populations using the prokaryotic 16S ribosomal RAN gene. It sheds new light on possible alteration of soil bacterial diversity due to irrigation water. It also reveals that the relative abundance of nitrifying bacteria is greater in soil irrigated with river water than soil irrigated with wastewater. The opposite is true for denitrifying bacteria. The findings serve as a call for further in-depth study to explore the long-term responses of soil microbial communities to irrigation waters for the sake of environmentally sound watershed management.

关键词： Irrigation Microbe Richness Diversity 16S rRNA Gene Heihe River

Application of Traditional Ecological Knowledge in Food and Water Security in the Semi-Arid Turkana County, Kenya

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Open Journal of Ecology 2020年第6期10卷 321-340页

作者： Cecilia Mwango Ratemo George Morara Ogendi guangwei huang Rhoda N. Ondieki Graduate School of Global Environmental Studies Sophia University Tokyo Japan Department of Environmental Science Egerton University Njoro Kenya Dryland Research Training and Ecotourism Centre Chemeron Kenya

Weather extremes negatively affect socioeconomic developments in arid and semi-arid areas (ASALs) and increase vulnerability of residents to food and water insecurity. Thus, communities adapt to such extremes of weather using Traditional Ecological Knowledge (TEK) and/or Modern Technologies. Modern farming technologies and land resource developments in ASALs have in past ignored TEK, and in most cases led to undesired outcomes. It’s against this backdrop that this study was conceived to assess TEK among the Turkana people, its application and contribution to food and water security. The research adopted a cross-sectional social survey in collecting data from Central Turkana Sub-County residents. The study revealed that the Turkana people possess vast knowledge related to their environment;that this TEK plays a significant role in food production, preservation and in natural resource management. For instance, in 82% of the respondents use TEK in enhancing livestock production through the selection of livestock species that are suitable and drought tolerant;over 70% of them use TEK in reducing risk associated with livestock losses due to prolonged droughts. Further, TEK influenced the development and conservation of the water resources (r = 0.631;p < 0.01) including siting boreholes and wells. There was a strong correlation (r = 0.755;p < 0.01) between TEK and food security. TEK should be incorporated into the decision-making processes involving development projects within the ASALs.

关键词： Arid and Semi-Arid Lands Climate Variability Droughts Food Security Traditional Ecological Knowledge Water Security