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TBM tunneling in mixed-face ground: Problems and solutions

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International Journal of Mining Science and Technology 2015年第4期25卷 641-647页

作者： Ma Hongsu yin lijun Gong Qiuming Wang Ju CNNC Beijing Research Institute of Uranium Geology Ecole Polytechnique Federalede Lausanne (EPFL) Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology

Mixed-face ground encountered in Tunnel Boring Machine(TBM) tunneling presents great challenges and may trigger potential hazards without warning. A detailed understanding of such unfavorable conditions is therefore critical to a successful bored tunnel. In this paper, we firstly present a brief review of the definition, classification and the factors related to mixed-face conditions. Secondly, for a better understanding of this topic, we investigate the main difficulties and problems involved in TBM tunnelling under mixed-face ground with detailed cases. Thirdly, from the viewpoint of rock-machine interaction, we give some suggestions on the corresponding mitigation measurements from three categories:(i) selection of TBM type and modification of TBM,(ii) condition of ground and(iii) optimization of TBM operation.

关键词： TBM Mixed face ground Influencing factor Problems Solutions

Discussion on the interrelationship among Cu-Ni sulfide deposits,mafic volcanic rocks and intrusive rocks in the Sipu region,northern Guangxi,China

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Chinese Journal Of Geochemistry 2012年第3期31卷 282-296页

作者： YANG Zhenjun ZHANG Wenshan LIU Jishun yin lijun Beijing Institute of Geology and Mineral Resources Beijing 100012China China Nonferrous Metals Mineral Resources Geological Survey Center Donia Resources Co.Ltd.Beijing 100012China School of Geoscience and Environmental Engineering Central South UniversityChangsha 410083China

The Sipu region of North Guangxi is located in the southwest of the "Jiangnan Ancient Land",where there are developed the oldest stratum in southern China,the Proterozoic Sipu Group,and there are also largely ex-posed mafic intrusive rocks,mafic volcanic rocks and copper-nickel sulfide *** mafic intrusive rocks and volcanic rocks are rich in MgO(6.52%-26.39%),but poor in K2O(0.05%-1.00%) and TiO2(0.33%-0.89%).They are also rich in trace elements such as Rb and Ba while poor in Ta,Nb and the *** of them have medium con-tents of rare-earth elements,30.26×10-6-126.71×10-6,in which LREEs are slightly rich with ΣLREE/ΣHREE of 1.35-2.46,δEu 0.79-1.33,displaying weak or no δEu anomaly,with the same geochemical *** right-inclined distribution patterns and the features show that magma would be formed at the comagmatic un-diagenetic *** studies show that mafic intrusive rocks and volcanic rocks are the products of the same source region evolving in different stages and *** copper-nickel sulfide deposits are characterized by liquation,crys-tallization and fractionation of mafic rocks,and have some interrelations with mafic intrusive rocks and volcanic rocks with respect to magmatic genesis.

关键词：铜镍硫化物矿床基性火山岩基性侵入岩中国南方西北部地球化学特征同源岩浆江南古陆

Measuring China's Real Estate Financial Innovation from the Perspective of Government,Enterprises and the Public:Index Compilation and Its Spatial-Temporal Characteristics Analysis

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Journal of Systems Science and Information 2023年第1期11卷 1-34页

作者： Jichang DONG lijun yin Xiaoting LIU Xiuting LI School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Big Data Mining and Knowledge Management Chinese Academy of SciencesBeijing 100190China China Construction Second Engineering Bureau Co.Ltd Beijing 100070China

In recent years,China has witnessed the rapid development in housing finance,and there have emerged constantly real estate finance innovations;however,there exists no relevant index for measuring the innovations of China's real estate *** on the perspectives of the governments,enterprises and the public,this paper constructs the"innovation index of real estate finance"on a quarterly basis from 2009 to 2019,with the method of empowerment which combines the subjective method(analytic hierarchy process)and the objective one(range coefficient method).It clearly and concretely depicts the innovations in housing finance and the related temporal-spatial characteristics in China since the outbreak of the financial crisis in *** index covers 30 provinces,autonomous regions and municipalities directly under the central government,and analyzes its temporal and spatial *** findings show that there exist a strong spatial autocorrelation and a big regional difference in innovations.

关键词： governments enterprises public real estate finance innovation

Evaluation of allergenic protein profiles in three Chinese high-oleic acid peanut cultivars using NanoLC-Orbitrap mass spectrometry

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Food Science and Human Wellness 2023年第3期12卷 851-860页

作者： Xinke Yang Haochen Bai lijun yin Jin Wang Wentong Xue Xin Jia College of Food Science and Nutritional Engineering Beijing Key Laboratory of Functional Food from Plant ResourcesChina Agricultural UniversityBeijing 100083China The Key Laboratory of Crop Genetics and Breeding Institute of Cereal and Oil CropsHebei Academy of Agricultural and Forestry SciencesShijiazhuang 050035China

High oleic-acid peanuts are known for their pre-longed shelf-life and health benefit due to high content of oleic fatty ***,the allergenicity and allergenic protein profiles in Chinese high-oleic peanuts have yet to be *** this purpose,an Orbitrap Fusion mass spectrometry(MS)-based method that is feasible for identification of putative allergenic protein as well as semi-quantitation of five major allergen protein in three different Chinese high-oleic peanut cultivars(JH 13,JH 16 and JH 18)have been *** show that three Chinese high-oleic acid peanut cultivars selected all contained highly allergenic proteins Ara h1,Ara h 2,Ara h 3 and Ara h *** allergenic protein profiles of Chinese high-oleic acid peanut cultivars were very similar to that of conventional peanuts,but the allergenic protein subunits varied greatly among higholeic ***,a comprehensive peptide-filtering pipeline had been developed for identification of potential peptide markers in peanut allergen *** the peptide-filtering pipeline,three novel peptide markers,IVQIEAKPNTLVLPK,SSNPDIYNPQAGSLR and AQSENYEYLAFK surrogate to Ara h 1,Ara h 3 with high abundance,good MS response and highly reliability were identified,which can be used as candidate peptide markers for the detection of peanut allergens in different food matrices.

关键词： Allergy High-oleic acid peanut Peptide-filtering pipeline NanoLC-Orbitrap mass spectrometry

A model to reduce tyrosine crystallization in Chinese fermented soybean curd by adjusting NaCl, ethanol and temperature during fermentation

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FOOD QUALITY AND SAFETY 2024年第8期8卷 356-368页

作者： Deng, Jia yin, lijun Yang, Xi Jia, Xin China Agr Univ Coll Food Sci & Nutr Engn Beijing Peoples R China China Agr Univ Coll Food Sci & Nutr Engn Beijing 100083 Peoples R China

Objectives White spots, mainly consisting of tyrosine, refer to small white particles that exist on the surface of mature Chinese fermented soybean curd or in the fermentation broth and have affected the appearance of Chinese fermented soybean *** and Methods The study determined the composition of the white spots throughout mass spectrometry and high-performance liquid chromatography and investigated the relationship between tyrosine content, amino acid nitrogen content, depth of the proteolysis index and protease activity to interpret the mechanism of white spot formation during *** In this study, the results confirm that tyrosine accounts for 78.22% of the white spots. Excessive tyrosine content can promote the formation of white spots during fermentation. Free tyrosine content, amino acid nitrogen content, depth of the proteolysis index and protease activity during the fermentation process increased during fermentation. Correlation analysis results show that free tyrosine content was positively correlated with amino acid nitrogen content, depth of the proteolysis index and protease activity, which showed that the production of tyrosine is related to the degree of proteolysis. Solubility studies show that high concentrations of NaCl and ethanol affect the production of tyrosine and reduce its solubility, while the increase in temperature increases the solubility of tyrosine. Taking NaCl, ethanol and temperature as influencing factors, a mathematical model of tyrosine solubility was *** This study lays the groundwork for understanding the mechanism of white spot formation during Chinese fermented soybean curd fermentation and provides solutions for controlling white spot formation.

关键词： Chinese fermented soybean curd white spots tyrosine mathematical modeling

A Study on the Relationship Between Land Finance and Housing Price in Urbanization Process: An Empirical Analysis of 182 Cities in China Based on Threshold Panel Models

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Journal of Systems Science and Information 2021年第1期9卷 74-94页

作者： Meiting HU Jichang DONG lijun yin Chun MENG Xiuting LI School of Econormics and Management University of Chinese Acaderny of SciencesBeijing 100190China School of Econormics and Management Universily of Chinese Acadermy of SciencesBeijing 100190China School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Development Research Centre of the State Council Beijing 100010China School of Econormics and Management University of Chinese Academy of SciencesBeijing 100190China

Scholars have a variety of theoretical explanations for housing price growth. However, few scholars have studied the internal influence mechanism among urbanization, land finance, and housing price. Based on the data of 182 prefecture-level cities from 2009 to 2016, this paper studies the influence of land finance on housing price under different urbanization rate levels. The study finds that with the increase of urbanization rate, the effect of land finance on housing price presents a "U" ***, an increase in land finance by 1% results in a corresponding increase in average housing price by 0.18%, with relatively low urbanization rate, 0.06% with medium level of urbanization rate,and 0.38% with high level of urbanization rate.

关键词： urbanization land finance housing price threshold panel model

Delayed sowing can increase lodging resistance while maintaining grain yield and nitrogen use efficiency in winter wheat

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The Crop Journal 2017年第6期5卷 541-552页

作者： Xinglong Dai Yuechao Wang Xiuchun Dong Taifeng Qian lijun yin Shuxin Dong Jinpeng Chu Mingrong He State Key Lab of Crop Biology/College of Agronomy Shandong Agricultural University Tai'an 271018 Shandong China Key Lab of Crop Ecophysiology and Farming System Ministry of Agriculture Tai'an 271018 Shandong China College of Plant Science and Technology Huazhong Agricultural University Wuhan 430070 Hubei China Jining Agricultural Technology Extension Station Jining 272037 Shandong China

Lodging resistance of winter wheat(Trnticum aestivum L.) can be increased by late ***, whether grain yield and nitrogen use efficiency(NUE) can be maintained with delayed sowing remains unknown. During the 2013-2014 and 2014-2015 growing seasons, two winter wheat cultivars were sown on three dates(early sowing on October 1, normal so,wing on October8, and late sowing on October 15) to investigate the responses of lodging resistance, grain yield,and NUE to sowing date. No significant differences in lodging resistance, grain yield, or NUE between early and normal sowing were observed. Averaging over the two cultivars and years,postponing the sowing date significantly increased lodging resistance by 53.6% and 49.6%compared with that following early and normal sowing, respectively. Lodging resistance was improved mainly through a reduction in the culm height at the center of gravity and an increase in the tensile strength of the base internode. Late sowing resulted in similar grain yield as well as kernel weight and number of kernels per square meter, compared to early and normal *** over the two cultivars and years, delayed sowing resulted in a reduction in nitrogen uptake efficiency(UPE) by 11.0% and 9.9% compared to early and normal sowing, respectively,owing to reduced root length density and dry matter accumulation before anthesis. An average increase in nitrogen utilization efficiency(UTE) of 12.9% and 11.2% compared to early and normal sowing, respectively, was observed with late sowing owing to a reduction in the grain nitrogen concentration. The increase in UTE offset the reduction in UPE, resulting in equal NUEs among all sowing dates. Thus, sowing later than normal could increase lodging resistance while maintaining grain yield and NUE.

关键词： Grain yield Lodging resistance Nitrogen use efficiency Sowing date Winter wheat

Measuring China's Real Estate Financial Innovation from the Perspective of Government， Enterprises and the Public: Index Compilation and Its Spaital-temporal Characteristics Analysis.

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Journal of Systems Science and Information 2022年

作者： Jichang DONG lijun yin Xiaoting LIU Xiuting LI Key Laboratory of Big Data Mining and Knowledge Management， Chinese Academy of Science China Construction Second Engineering Bureau Co.Ltd School of Economics and Management， University of Chinese Academy of Sciences

In recent years， China has witnessed the rapid development in housing finance， and there have emerged constantly real estate finance innovations; however， there exists no relevant index for measuring the innovations of China’s real estate finance. Based on the perspectives of the governments， enterprises and the public， this paper constructs the “Innovation Index of Real Estate Finance” on a quarterly basis from 2009 to 2019， with the method of empowerment which combines the subjective method (Analytic Hierarchy Process) and the objective one (Range Coefficient Method). It clearly and concretely depicts the innovations in housing finance and the related temporal-spatial characteristics in China since the outbreak of the financial crisis in 2008. The index covers 30 provinces， autonomous regions and municipalities directly under the central government， and analyzes its temporal and spatial characteristics. The findings show that there exist a strong spatial autocorrelation and a big regional difference in innovations.

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Effect of Pectins on Dough Rheology and Chinese Steamed Bread Quality

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Grain & Oil Science and Technology 2018年第2期1卷 77-84页

作者： LI Jinxin yin lijun LI Jinlong Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Technology and Business University Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients College of Food Science and Nutritional Engineering China Agricultural University

Dough preparation and performance are two critical factors influencing the final quality of wheat products. The influence of high and low methoxyl pectins on empirical and dynamic rheological properties of dough and Chinese steamed bread(CSB)quality were investigated. Different concentrations of high methoxyl apple pectin(HMAP), low methoxyl apple pectin(LMAP),and amidation apple pectin(ALMAP) were tested. Results from dynamic and empirical rheological tests indicated that all concentrations of pectins tested(0.2%, 0.6%, and 1%) negatively affected the gluten network. The low methoxyl pectins, LMAP and ALMAP, which had higher anionic densities, resulted in a pronounced weakening of the dough. Meanwhile, dough fermentation properties improved in the presence of appropriate pectins concentrations, and higher maximum dough height, stability of dough pore space, and gas retention were recorded. HMAP was the pectin most effective in influencing dough fermentation properties at all tested concentrations. Regarding CSB quality, textural properties, specific volume, moisture content, and water-holding capacity were analyzed. Generally, the textural properties of CSB were improved, including improved springiness and decreased hardness and chewiness, when 0.2%–0.6% HMAP or LMAP was used. The specific volume of CSB was increased by adding 0.2%–1% HMAP,0.6%–1% LMAP, or 0.2%–0.6% ALMAP. Moreover, CSB moisture loss was progressively reduced in the presence of different pectins at all tested concentrations during storage. In conclusion, pectins, especially HMAP, are good additives for improving the fermentation properties of dough and overall quality of CSB.

关键词： Pectin Dough Rheological properties Chinese steamed bread quality