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Triboelectric properties of ilmenite and quartz minerals and investigation of triboelectric separation of ilmenite ore

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International Journal of Mining Science and Technology 2018年第2期28卷 223-230页

作者： Yang Xing Wang Haifeng Peng Zhen Hao Juan Zhang Guangwen Xie Weining He Yaqun key laboratory of Coal Processing and efficient utilization China University of Mining and TechnologyMinistry of EducationXuzhou 221116China School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221116China Jinan Yuxing Chemical Co.Ltd. Jinan 250119China Advanced Analysis&Computation Center China University of Mining&TechnologyXuzhou 221116China

Triboelectric separation, as an entirely dry technology, is a prospective method to process fine *** aim of this paper is to investigate the performance of triboelectric separation of ilmenite and quartz minerals in a lab unit and to get ready for the separation of ilmenite ore. A tribocharge measurement system was used to test the triboelectric properties of ilmenite and quartz particles with tribochargers respectively made of PVC, PPR, PMMA, Teflon, copper, stainless steel and quartz glass. The results show that the ilmenite particles charged positively while quartz charged negatively when tribocharged with PVC tribocharger. The mixture of 12% ilmenite and 88% quartz was prepared for the triboelectric separation. The recovery of ilmenite increases with the increase of airflow rate, decreases with the increasing feed rate, and grows up firstly and then decreases with the increasing voltage. A maximum ilmenite recovery of 51.71% with ilmenite content 32.72% was obtained at 40 m^3/h airflow rate, 6 g/s feed rate and 20 kV voltage. According to the optimal parameters of the separation of ilmenite and quartz mixture,fine ilmenite ore with 7.55% Ti content was beneficiated using the unit and the Ti content increased to 12.32% in concentrate product.

关键词： Triboelectric separation Tribocharge Ilmenite Quartz Ilmenite ore

Growth and fatty acid composition of discus fish Symphysodon haraldi given varying feed ratios of beef heart,duck heart,and shrimp meat

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Aquaculture and Fisheries 2018年第2期3卷 84-89页

作者： Bin Wen Zaizhong Chen Hengchao Qu Jianzhong Gao key laboratory of Freshwater Aquatic Genetic resources Ministry of AgricultureShanghai Ocean UniversityShanghai 201306China key laboratory of Exploration and utilization of Aquatic Genetic resources Ministry of EducationShanghai Ocean UniversityShanghai 201306China Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding Shanghai Ocean UniversityShanghai 201306China

A 56 days experiment was carried out to examine the effects of nine different diets on the growth and biochemical composition of discus fish Symphysodon haraldi *** different types of diets were created using three main ingredients(beef heart,duck heart,and shrimp meat)in varying proportions,i.e.,10:0:0(F1),9:0:1(F2),8:0:2(F3),6:2:2(F4),4:4:2(F5),2:6:2(F6),0:8:2(F7),0:9:1(F8)and 0:10:0(F9).As the proportion of beef heart within the diet decreased,the specific growth rates(SGR),length growth rates(LGR),and height growth rates(HGR)of *** first decreased(F1-F3),then increased(F4-F6),and thereafter decreased(F7-F9),while the feed coefficient rates(FCR)showed the opposite *** significant differences in SGR,LGR,HGR,and FCR between the F1 and F6 groups were *** survival rates decreased with lower beef heart *** inclusion of beef heart and/or shrimp meat often resulted in a decrease of crude protein and ash *** fatty acids(FA)associated with the F3,F8,and F9 groups showed significantly lower concentrations of 18:3n-3 and 20:5n-3 relative to the other ***,the F7 and F9 diets and the *** these diets were fed to demonstrated low and high 20:4n-6 levels,*** the F1 and F9 diets were both poor in 22:6n-3,the F1 group showed significantly higher 22:6n-3 content than the F9 group,indicating the more efficient retention and/or bioconversion of this FA by *** in the F1 *** results of this study suggest that shrimp meat might not necessarily be added into moist feed for *** *** with up to 60%duck heart could be achieved without affecting growth,but showed some negative influence on survival rates.

关键词： Symphysodon haraldi Beef heart Duck heart Growth Fatty acid

Particle mixing behavior of fine coal in density control of gas-solid separation fluidized bed

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Particuology 2020年第3期18卷 76-87页

作者： Bo Lv Zhenfu Luo Yanhong Fu Bo Zhang Xingzong Qin Xiangnan Zhu College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China key laboratory of Coal Processing and efficient utilization of Ministry of Education China University of Mining&TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China School of Chemical&Environmental Engineering Shandong University of Science&TechnologyQingdao 266590China

In a gas-solid separation fluidized bed,mixing of fine coal is necessary to achieve a suitable bed density to enable effective separation of low rank *** the basis of a variety of mixture models,a gas-solid separation fluidized bed was judged,where fine coal particles of 0.6-1.0mm were uniformly mixed with magnetite ***-speed dynamic camera technology was combined with a slump-sampling method to study the mixing process of the fine coal in the fluidized *** results showed that limitations of the fluidized bed structure cause the mixing process to be dominated by lateral diffusion and supplemented by axial *** diffusion was mainly achieved through the ascension of bubbles,whereas lateral diffusion was determined by the bursting action of the gas bubbles at the surface of the bed and the undulating characteristics of the *** effective lateral diffusion coefficient increased exponentially with gas velocity but had no strong relationship with the bed *** the feed point moved toward the center,fine coal began to diffuse to both sides,which shortened the time for the bed density stabilization from 20 to 5 *** bed density of the layer was stabilized at approximately 1.75 g/*** separation efficiency of the gas-solid separation fluidized bed containing binary mixtures was more obvious for 6-50 mm raw coal,with a probable error E of 0.16.

关键词： Gas-solid separation fluidized bed Density control Fine coal Diffusion behavior Separation process

Vibration spectroscopic technique for species identification based on lipid characteristics

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 255-268页

作者： Gao Fei Han Lujia Liu Xian Biomass and Bioresource utilization laboratory College of EngineeringChina Agricultural UniversityBeijing 100083China

Due to the widespread of adulteration of lipid in food and feed industry,the quality and safety of lipid are of public concern ***,the current article presents theory and mechanism of species identification of lipid by spectroscopic *** of near-infrared reflectance spectroscopy(NIR),Fourier transform infrared spectroscopy(FT-IR),and Fourier transform Raman spectroscopy(FT-Raman)applied to species identification of lipid were *** addition,the relationship between lipid and spectroscopy as well as the recent advances of species identification of lipid were *** showed that FT-IR and FT-Raman spectroscopies possessed more efficient potential for species identification of ***,prospects for future lipid detection and relative practical application,and combination of spectroscopy and other technique were further discussed.

关键词： feedstuff fatty acid NIR FT-IR FT-Raman spectroscopy

The uniqueness and superiority of energy utilization in yaks compared with cattle in the highlands:A review

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Animal Nutrition 2023年第1期12卷 138-144页

作者： Xiaojing Liu Jian Gao Suozhu Liu Yanfen Cheng Lizhuang Hao Shujie Liu Weiyun Zhu laboratory of Gastrointestinal Microbiology National Center for International Research on Animal Gut NutritionNanjing Agricultural UniversityNanjing 210095China College of Animal Science Tibet Agricultural and Animal Husbandry UniversityLinzhi 860000China key laboratory of Plateau Grazing Animal Nutrition and feed Science of Qinghai Province State Key Laboratory of Plateau Ecology and AgricultureQinghai Plateau Yak Research CenterQinghai Academy of Animal Science and Veterinary Medicine of Qinghai UniversityXining 810016China

Yaks living on the Qinghai-Tibetan Plateau for a long time have evolved a series of mechanisms to adapt to the unique geographical environment and climate characteristics of the *** with other ruminants,yaks have higher energy utilization and metabolic *** paper presents possible mechanisms responsible for the efficient energy utilization,absorption and metabolism resulting from the unique evolutionary process of *** is hoped that the information discussed in this review will give a better insight into the uniqueness and superiority of yaks in regards to energy metabolism and utilization compared with cattle and open new avenues for the targeted regulation of energy utilization pathways of other ruminants.

关键词： Energy metabolism Energy utilization Fibrous feed Yak

Oxidative stress, nutritional antioxidants and beyond

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Science China(Life Sciences) 2020年第6期63卷 866-874页

作者： Qiuping Guo Fengna Li Yehui Duan Chaoyue Wen Wenlong Wang Lingyu Zhang Ruilin Huang Yulong Yin laboratory of Animal Nutritional Physiology and Metabolic Process Institute of Subtropical AgricultureChinese Academy of SciencesKey Laboratory of Agro-ecological Processes in Subtropical RegionHunan Provincial Engineering Research Center for Healthy Livestock and Poultry ProductionScientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-CentralMinistry of AgricultureChangsha 410125China University of Chinese Academy of Sciences Beiing 100039China Hunan Co-Innovation Center of Animal Production Safety Hunan Collaborative Innovation Center for Utilization of Botanical Functional IngredientsChangsha 410128China laboratory of Animal Nutrition and Human Health School of BiologyHunan Normal UniversityChangsha 410018China

Free radical-induced oxidative stress contributes to the development of metabolic syndromes(Mets), including overweight,hyperglycemia, insulin resistance and pro-inflammatory state. Most free radicals are generated from the mitochondrial electron transport chain;under physiological conditions, their levels are maintained by efficient antioxidant systems. A variety of transcription factors have been identified and characterized that control gene expression in response to oxidative stress *** antioxidant compounds have been largely studied for their strong antioxidant capacities. This review discusses the recent progress in oxidative stress and mitochondrial dysfunction in Mets and highlights the anti-Mets, anti-oxidative, and antiinflammatory effect of polyphenols as potential nutritional therapy.

关键词： reactive oxygen species oxidative stress mitochondrial dysfunction signal transduction nutritional antioxidant polyphenols

Genetic study and molecular breeding for high phosphorus use efficiency in maize

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Frontiers of Agricultural Science and Engineering 2019年第4期6卷 366-379页

作者： Dongdong LI Meng WANG Xianyan KUANG Wenxin LIU key laboratory of Crop Heterosis and utilization(Ministry of Education)/Beijing key laboratory of Crop Genetic Improvement/National Maize Improvement Center China Agricultural UniversityBeijing 100193China Department of Biological and Environmental Sciences Alabama A&M UniversityNormalAL 35762USA

Phosphorus is the second most important macronutrient after nitrogen and it has many vital functions in the life of *** soils have a low available P content,which has become a key limiting factor for increasing crop ***,low P use efficiency(PUE)of crops in conjunction with excessive application of P fertilizers has resulted in serious environmental ***,dissecting the genetic architecture of crop PUE,mining related quantitative trait loci(QTL)and using molecular breeding methods to improve high PUE germplasm are of great significance and serve as an efficient approach for the development of sustainable *** this review,molecular and phenotypic characteristics of maize inbred lines with high PUE,related QTL and genes as well as low-P responses are *** on this,a breeding strategy applying genomic selection as the core,and integrating the existing genetic information and molecular breeding techniques is proposed for breeding high PUE maize inbred lines and hybrids.

关键词： maize phosphorus use efficiency quantitative trait loci genetic study,molecular breeding genomic selection

Screening of diverse cassava genotypes based on nitrogen uptake efficiency and yield

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Journal of Integrative Agriculture 2020年第4期19卷 965-974页

作者： KANG Liang LIANG Qiong-yue JIANG Qiang YAO Yi-hua DONG Meng-meng HE Bing GU Ming-hua State key laboratory for Conservation and utilization of Subtropical Agro-bioresources/College of Agriculture Guangxi UniversityNanning 530004P.R.China College of Pharmacy Guangxi Medical UniversityNanning 530021P.R.China Modern Agricultural Technology Research and Promotion Center Baise 533612P.R.China

As one of the top three tuber crops of the world, cassava is a staple food and feed crop for tropical and subtropical regions. Because of its high drought resistance and tolerance to nutrient deficiency, cassava is usually cultivated on hilly areas that are nutrient-poor. Nitrogen(N) is one of the significant factors affecting cassava yield. A double factorial(N level×genotypes) split-plot field experiment was conducted to analyze differences in yield and N accumulation of 25 cassava genotypes under low-N conditions to screen for cassava genotypes with high-N efficiency. The two-year field experiment showed that cassava yield and N accumulation are determined by specific genotypes, soil N levels, and year. Among these factors, soil N levels are the main factors that are responsible for differences in cassava yield. When yield and relative N accumulation under low-N conditions were used as screening markers, we identified an efficient and responsive genotype(SC10), and two inefficient and non-responsive genotypes(SC205 and GR5). The efficient and responsive genotype and the inefficient and non-responsive genotype can be used as study materials to further reveal the mechanisms for high-N efficiency in cassava.

关键词： cassava high-nitrogen(N)efficiency genotype screening low-N soil

Hierarchical Representations Feature Deep Learning for Face Recognition

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Journal of Data Analysis and Information Processing 2020年第3期8卷 195-227页

作者： Haijun Zhang Yinghui Chen Guangdong Provincial key laboratory of Conservation and Precision utilization of Characteristic Agricultural resources in Moun-tainous Areas Meizhou China School of Computing Jiaying University Meizhou China School of Mathematics Jiaying University Meizhou China

Most modern face recognition and classification systems mainly rely on hand-crafted image feature descriptors. In this paper, we propose a novel deep learning algorithm combining unsupervised and supervised learning named deep belief network embedded with Softmax regress (DBNESR) as a natural source for obtaining additional, complementary hierarchical representations, which helps to relieve us from the complicated hand-crafted feature-design step. DBNESR first learns hierarchical representations of feature by greedy layer-wise unsupervised learning in a feed-forward (bottom-up) and back-forward (top-down) manner and then makes more efficient recognition with Softmax regress by supervised learning. As a comparison with the algorithms only based on supervised learning, we again propose and design many kinds of classifiers: BP, HBPNNs, RBF, HRBFNNs, SVM and multiple classification decision fusion classifier (MCDFC)—hybrid HBPNNs-HRBFNNs-SVM classifier. The conducted experiments validate: Firstly, the proposed DBNESR is optimal for face recognition with the highest and most stable recognition rates;second, the algorithm combining unsupervised and supervised learning has better effect than all supervised learning algorithms;third, hybrid neural networks have better effect than single model neural network;fourth, the average recognition rate and variance of these algorithms in order of the largest to the smallest are respectively shown as DBNESR, MCDFC, SVM, HRBFNNs, RBF, HBPNNs, BP and BP, RBF, HBPNNs, HRBFNNs, SVM, MCDFC, DBNESR;at last, it reflects hierarchical representations of feature by DBNESR in terms of its capability of modeling hard artificial intelligent tasks.

关键词： Face Recognition Unsupervised Hierarchical Representations Hybrid Neural Networks RBM Deep Belief Network Deep Learning