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| 1 | Effect of sintering temperature in argon atmosphere on microstructure and properties of 3D printed alumina ceramic cores显示文摘Alumina ceramics with different sintering temperatures in argon atmosphere were obtained using stereolithography-based 3D printing.The effects of sintering temperature on microstructure and physical and mechanical properties were investigated.The results show that the average particle size,shrinkage,bulk density,crystallite size,flexural strength,Vickers hardness,and nanoindentation hardness increased with the increase in sintering temperature,whereas the open porosity decreased with increasing sintering temperature.No change was observed in phase composition,chemical bond,atomic ratio,and surface roughness.For the sintered samples,the shrinkage in Z direction is much greater than that in X or Y direction.The optimum sintering temperature in argon atmosphere is 1350℃with a shrinkage of 3.0%,3.2%,and 5.5%in X,Y,and Z directions,respectively,flexural strength of 26.7 MPa,Vickers hardness of 198.5 HV,nanoindentation hardness of 33.1 GPa,bulk density of 2.5 g/cm^3,and open porosity of 33.8%.The optimum sintering temperature was 70℃higher than that sintering in air atmosphere when achieved the similar properties. | He LI Yongsheng LIU Yansong LIU Qingfeng ZENG Kehui HU Zhigang LU Jingjing LIANG | 2020 | Journal of Advanced Ceramics2020，9，2： | 13 |
| 2 | Molecular characteristics of the omp A gene of serotype B Chlamydia trachomatis in Qinghai Tibetan primary school students显示文摘To study the molecular characteristics of Chlamydia trachomatis, the major outer membrane protein gene(omp A) of C. trachomatis from primary school students with trachoma residing in the Qinghai Tibetan area was sequenced and compared with the same serotype in Gen Bank. In Jianshetang Primary School and Galeng Central Primary School in the Galeng Tibetan Township of Qinghai Haidong Sala Autonomous County, scraped samples were collected from the upper tarsal conjunctiva and lower conjunctival sac of both eyes of 45 students with trachoma, stored at 4°C, and transported to Beijing Tongren Hospital by air within 24 h. The samples were screened for C. trachomatis by real-time PCR. The omp A gene from the C. trachomatis-positive samples was amplified by nested PCR. The serotype was confirmed by National Center for Biotechnology Information(NCBI) BLAST search and homology analysis. The entire omp A gene sequence was compared with the corresponding gene sequences of serotype B strains available in Gen Bank. Of the 45 students aged 6–13 years with trachoma, 26 C. trachomatis-positive students were identified by the initial real-time PCR screening(average age,(9.09±1.63) years; sex ratio, 1.0), accounting for 57.78%(26/45). The cycle threshold values for real-time PCR were 16.79–37.77. Half(13/26) of C. trachomatis-positive students had a bacterial copy number of >105. The compliance rate of the omp A gene sequences with the C. trachomatis serotype B strains in Gen Bank was up to 99%. Two novel genetic mutations were found when the omp A gene was compared with those of the 11 serotype B strains in Gen Bank. The two non-synonymous mutations were located at(i) position 271 in the second constant domain, an adenine(A) to guanine(G) substitution(ACT?GCT), changing the amino acid at position 91 from threonine to alanine(Thr?Ala) in all 26 strains; and(ii) position 887 in the fourth variable domain, a cytosine(C) to thymine(T) substitution(GCA?GTA), changing the amino acid at residue 296 from alanine to valine(Ala?Val) in four of the 26 strains. Six mutations were identified relative to ATCC VR-573. The strains could be divided into two gene clusters according to the mutation at nucleotide position 887: CQZ-1(China Qinghai Tibetan-1) and CQZ-2(China Qinghai Tibetan-2). We thus detected two novel serotype B mutant strains of C. trachomatis among study subjects with trachoma. | Xue Li Shaoya Zhang Qingfeng Liang Mei Wang Ailian Hu Xiuyuan Li Benshan Yang Mingxin Zhang Ningli Wang Xinxin Lu | 2016 | Science China(Life Sciences)2016，59，6： | 6 |
| 3 | The chimeric genes in the hybrid lineage of Carassius auratus cuvieri(♀)×Carassius auratus red var.(♂)显示文摘Hybridization can combine the genomes of different strains or species, which leads to changes of genotype and phenotype in the hybrids. In this study, we aimed to investigate the genetic variations of hybrids(WR-F1 and WR-F2) derived from the intraspecific hybridization of white crucian carp(Carassius auratus cuvieri, WCC, ♀) and red crucian carp(Carassius auratus red var., RCC, ♂). Here, we compared the orthologous genes in the liver transcriptomes of hybrids with those of WCC and RCC, and classified the orthologous genes into eight gene patterns within three categories(chimera, mutant, and biparental origin genes).The results revealed 19.04%, 4.17% chimeric genes and 6.90%, 5.05% mutations of orthologous genes in WR-F1 and WR-F2 respectively. Seventeen of twenty-three characterized genes(77%) were confirmed to be the chimeras at the genomic DNA level.The GO classification discovered that some chimeric and mutant genes were related to metabolic process, immune system and developmental process in WR-F1. Our results provide the new evidence that hybridization can combine the parental genomes,leading to changes in the genotype of the resultant hybrids. This is the first report on the formation of chimeric genes from fish intraspecific hybridization, which is potentially interesting from the context of both evolution and the genetic breeding of fish. | Qingfeng Liu Yanhua Qi Qiuli Liang Xiujuan Xu Fangzhou Hu Jing Wang Jun Xiao Shi Wang Wuhui Li Min Tao Qinbo Qin Rurong Zhao Zhanzhou Yao Shaojun Liu | 2018 | Science China(Life Sciences)2018，61，9： | 6 |
| 4 | Ordered mesoporous NiFe_2O_4 with ultrathin framework for low-ppb toluene sensing显示文摘Highly sensitive and selective detection against specific target gases,especially at low-ppb(part per billion)level,remain a great number of challenges in gas sensor applications.In this paper,we first present an ordered mesoporous NiFe_2O_4 for highly sensitive and selective detection against low-ppb toluene.A series of mesoporous NiFe_2O_4 materials were synthesized by templating from mesoporous silica KIT-6 and its framework thickness was reduced from 8.5 to 5 nm by varying the pore size of KIT-6 from 9.4 to 5.6 nm,accompanied with the increase of the specific surface area from 134 to 216 m^2g^(-1).The ordered mesoporous NiFe_2O_4 with both ultrathin framework of 5 nm and large specific surface area of up to 216 m^2g^(-1)exhibits a highest response(R_(gas)/R_(air)-1=77.3)toward 1,000 ppb toluene at 230℃ and is nearly 7.3 and 76.7 times higher than those for the NiFe_2O_4 replica with thick framework and its bulk counterpart respectively,which also possesses a quite low limit of detection(<2 ppb),and good selectivity. | Xiaoyong Lai Kun Cao Guoxin Shen Ping Xue Dan Wang Fang Hu Jianli Zhang Qingfeng Yang Xiaozhong Wang | 2018 | Science Bulletin2018，63，3： | 3 |
| 5 | Study of infectious conjunctivitis among children in rural areas of Qinghai province显示文摘Infectious conjunctivitis is no longer a common eye disease in cities and developed areas, but in remote mountainous regions of China where living conditions are relatively under-developed, the occurrence of infectious conjunctivitis remains a public health issue. Here, we evaluate the ratio of infectious conjunctivitis among primary school students in the rural areas of Xunhua, Huangyuan, and Huzhu Counties in the Qinghai province of China, and report the microorganisms involved in causing infection. Of the 765 eligible primary school students, 694 participated to this study(a response rateof 90.7%), 381 boys and 313 girls, with a mean age of 7.52 years(range 7–9 years). A clinical diagnosis of infectious conjunctivitis was returned for 238 of the 694 children examined. The ratio of infectious conjunctivitis in Xunhua County(46.64%) was higher compared to that in Huangyuan(26.67%; P=0.03) and Huzhu Counties(23.61%; P=0.02). The leading cause of conjunctivitis was bacterial, followed by chlamydial and viral. Our results show that there is a high ratio of infectious conjunctivitis among rural primary school students in Qinghai province. | Qingfeng Liang Xinxin Lu Mei Wang Lei Tian Antoine Labbé Ailian Hu | 2016 | Science China(Life Sciences)2016，59，6： | 3 |
| 6 | Climatic significance of n-alkanes and their compound-specific dD values from lake surface sediments on the Southwestern Tibetan Plateau显示文摘The content and hydrogen isotope ratios of n-alkanes extracted from recent lake surface sediments sampled from nine lakes in three different climate zones on the Southwestern Tibetan Plateau were analyzed.Values were compared with n-alkanes in plants from lake drainages,and dD values of meteoric water,lake water,and mean annual precipitation.The results showed that n-C23was predominantly derived from aquatic plants,and n-C27–n-C33from terrestrial higher plants.The average carbon chain length of n-C27–n-C33(ACL27–33)was positively correlated with the mean annual precipitation.dD values of the long-chain n-alkanes n-C29and n-C31of terrestrial origin(varying between-214%and-169%,and-226%and-185%,respectively)were inversely correlated with mean annual precipitation;but in accordance with the average annual variations in dD(OIPC),dD values of n-C31were strongly related to the dD values of growing season meteoric water(R2=0.74).The large difference between dD values of n-C23of aquatic origin and n-C31(an average of about 27%)demonstrates the enrichment of the lake water dD compared to precipitation,caused by strong evaporation in the semiarid–arid areas of the southwestern Tibetan Plateau.Average value of en C25 31=p(-95%)is evidently higher than the value observed in European wet regions(-128%);besides,en C31(about-116%)is constant along the study transect(SD=9),which indicates that n-C31is a useful proxy for the environment. | Xing Hu Liping Zhu Yong Wang Junbo Wang Ping Peng Qingfeng Ma Jianfang Hu Xiao Lin | 2014 | Chinese Science Bulletin2014，59，24： | 3 |
| 7 | An Improved Unsupervised Image Segmentation Method Based on Multi-Objective Particle Swarm Optimization Clustering Algorithm显示文摘Most image segmentation methods based on clustering algorithms use singleobjective function to implement image segmentation.To avoid the defect,this paper proposes a new image segmentation method based on a multi-objective particle swarm optimization(PSO)clustering algorithm.This unsupervised algorithm not only offers a new similarity computing approach based on electromagnetic forces,but also obtains the proper number of clusters which is determined by scale-space theory.It is experimentally demonstrated that the applicability and effectiveness of the proposed multi-objective PSO clustering algorithm. | Zhe Liu Bao Xiang Yuqing Song Hu Lu Qingfeng Liu | 2019 | Computers, Materials & Continua2019，，2： | 2 |
| 8 | Research on the eneergy regeneration systems for hybrid hydraulic excavators 显示文摘 | Tianliang Lin Qingfeng Wang Baozan Hu | 2010 | Automation In Construction2010，19，： | 1 |
| 9 | Development of hybrid powered hydraulic construction machinery 显示文摘 | Tianliang Lin Qingfeng Wang Baozan Hu | 2010 | Automation In Construction2010，19，： | 1 |
| 10 | Study on control of the rotational speed of diesel engine under state-switch mode in parallel hybrid hydraulic excavator显示文摘 | HU Baozan WANG Qingfeng WANG Hongmei | 2013 | Applied Mechanics and Materials2013，290，： | 1 |
| 11 | Coordinated adaptive robust contouring control of an Industrial biaxial precision gantry with cogging force compensations 显示文摘 | HU Chuxiong YAO Bin WANG Qingfeng | 2010 | Industrial Electronics IEEE Transactions on2010，57，： | 1 |
| 12 | Development of hybrid powered hydraulic construction machinery显示文摘 | LIN Tianliang WANG Qingfeng HU Baozan | 2010 | Automation in Construction2010，19，1： | 1 |
| 13 | The surface fractal investigation on the carbon nanotubes modified by the adsorption of PAA显示文摘 | Hou Qingfeng Lu Xiancai Liu Xiandong Hu Baixing Shen Jian | 2005 | Surface and Coating Technology2005，190，23： | 1 |
| 14 | Research on the energy regeneration systems for hybrid hydraulic excavators显示文摘 | LIN Tianliang WANG Qingfeng HU Baozan | 2010 | Automation in Construction2010，19，8： | 1 |
| 15 | Development of hybrid powered hydraulic construction machinery显示文摘 | LIN Tianliang WANG Qingfeng HU Baozan | 2010 | Automation in Construction2010，，19： | 1 |
| 16 | Approximation by the Modified q-Baskakov-Szsz Operators显示文摘In this paper we propose the q analogues of modified Baskakov-Sz′asz operators. We estimate the moments and established direct results in term of modulus of continuity. An estimate for the rate of convergence and weighted approximation properties of the q operators are also obtained. | Qingfeng Mo Xiaomin Hu | 2014 | Analysis in Theory and Applications2014，30，3： | 1 |
| 17 | Research on the energy regeneration systems for hybrid hydraulic excavators显示文摘 | Tianliang Lin Qingfeng Wang Baozan Hu Wen Gong | 2010 | Automation in Construction2010，，8： | 1 |
| 18 | Devel-opment of hybrid powered hydraulic construction machinery显示文摘 | LIN Tianliang WANG Qingfeng HU Baozan | | 0，，01： | 1 |
| 19 | Re-search on the energy regeneration systems for hybrid hy-draulic excavators Automation in construction显示文摘 | LIN Tianliang WANG Qingfeng HU Baozan | 2010 | 2010，，08： | 1 |
| 20 | A joint call for actions to advance taxonomy in China显示文摘Taxonomy plays an important role in understanding the origin, evolution, and ecological functionality of biodiversity. There are large number of unknown species yet to be described by taxonomists, which together with their ecosystem services cannot be effectively protected prior to description. Despite this, taxonomy has been increasingly underrated insufficient funds and permanent positions to retain young talents. Further, the impact factordriven evaluation systems in China exacerbate this downward trend, so alternative evaluation metrics are urgently necessary. When the current generation of outstanding taxonomists retires,there will be too few remaining taxonomists left to train the next generation. In light of these challenges, all co-authors worked together on this paper to analyze the current situation of taxonomy and put out a joint call for immediate actions to advance taxonomy in China. | Chaodong Zhu Arong Luo Ming Bai Michael COrr Zhonge Hou Siqin Ge Jun Chen Yibo Hu Xuming Zhou Gexia Qiao Hongzhi Kong Limin Lu Xiaohua Jin Lei Cai Xinli Wei Ruilin Zhao Wei Miao Qingfeng Wang Zhongli Sha Qiang Lin Meng Qu Jianping Jiang Jiatang Li Jing Che Xuelong Jiang Xiaoyong Chen Lianming Gao Zongxin Ren Chunlei Xiang Shixiao Luo Donghui Wu Dong Liu Yanqiong Peng Tao Su Chenyang Cai Tianqi Zhu Wanzhi Cai Xingyue Liu Hu Li Huaijun Xue Zhen Ye Xuexin Chen Pu Tang Shujun Wei Hong Pang Qiang Xie Feng Zhang Feng Zhang Xianjin Peng Aibing Zhang Taiping Gao Changfa Zhou Chen Shao Libin Ma Zhaoming Wei Yunxia Luan Ziwei Yin Wu Dai Cong Wei Xiaolei Huang Jingxian Liu Xiangsheng Chen Tianci Yi Zhisheng Zhang Zhulidezi Aishan Qin Li Hongying Hu | 2022 | Zoological Systematics2022，47，3： | 1 |
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