• Title/Summary/Keyword: Beijing

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Study on the bearing capacity of cold-formed steel under different boundary conditions in transmission towers

  • Han, Junke;Zhao, Xu;Tang, Zhenyun;Ma, Hua;Li, Zhenbao
    • Earthquakes and Structures
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    • v.12 no.6
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    • pp.665-672
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    • 2017
  • Cold-formed steel is widely used in steel structures, especially in transmission towers, because of advantages such as low weight, high strength, excellent mechanical properties, etc. However, there is not a special design code for cold-formed steel use in transmission towers in China. For this study, a total of 105 compression members were tested statically to investigate the bearing capacity of cold-formed steel members under different boundary conditions in transmission towers. The test results were compared to the results predicted by the current design codes. For deeper insight, additional coupled members were simulated using finite element analysis. An improved design method was developed based on the experimental and analytical results.

Research on New Nylon-6 Nanocomposites with Flame Retardancy

  • Qiao, Jinliang;Zhang, Xiaohong;Liu, Yiqun;Dong, Weifu;Wang, Qingguo;Gui, Hua;Gao, Jianming;Song, Zhihai;Lai, Jinmei;Huang, Fan
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.139-140
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    • 2006
  • Some of novel halogen-free, elastomeric flame retardants for nylon-6 have been developed. It is found that the S-ENP and clay have a synergistic flame retardant effect on nylon-6 resulted from the formation of two barriers on the nanocomposite residue surface at the end of combustion. A novel flame retardant ternary nanocomposite of nylon-6/ENP/nano-Magnesium hydroxide was also fabricated. The new ternary composite has better flame retardancy and thermal stability than the conventional one because nano-MH can disperse much more homogeneous in the new ternary composite than in the conventional one.

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Color Characteristics of the Costumes of the Beijing Opera (중국 경극 의상의 색채특성)

  • Kim, Ji-Eon
    • Journal of the Korean Society of Costume
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    • v.59 no.2
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    • pp.143-153
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    • 2009
  • The purpose of this study is to provide color information in order to planning and merchandising in china fashion through the color of Beijing opera. In objective study, we collect total 302 Beijing opera images. The collecting method of source data is to extract digital color data by color picker. We transform RGB color data to H V/C, CIE L*a*b and analyze the attributes of color and tone, three-dimensional analysis. The results of this study are as follows : 1. The color distrbution of Beijing opera is R(26.9%)>YR(18.2%)>PB(11.6%)>Y(9.6%). Traditional preference color, red is most popular color as 26.7%:, the practice of vivid tone red is numerous. 2. The tone distribution of Beijing opera costume is P(16%)>It(13.9%)>d(11%)>5(9.6%)>4kg (8.2%)>b(7.1%:). The value o# Beijing opera costume distribute medium and medium-high and the chroma of those distributes low. 3. High chroma yellow is restrictive color as the symbol of emperor in china but medium-low chroma yellow is very frequently used. 4. Blue is often used in china costume. Especially in Beijing opera costume blue is symbol of bravery, dignity, cruel character 5. White in Beijing opera costume is much used for symbol of righteous loyalist. Black is less used than white in Beijing opera costume and black is authority color for symbol of the prime minister.

Bird's Eye View Semantic Segmentation based on Improved Transformer for Automatic Annotation

  • Tianjiao Liang;Weiguo Pan;Hong Bao;Xinyue Fan;Han Li
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.17 no.8
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    • pp.1996-2015
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    • 2023
  • High-definition (HD) maps can provide precise road information that enables an autonomous driving system to effectively navigate a vehicle. Recent research has focused on leveraging semantic segmentation to achieve automatic annotation of HD maps. However, the existing methods suffer from low recognition accuracy in automatic driving scenarios, leading to inefficient annotation processes. In this paper, we propose a novel semantic segmentation method for automatic HD map annotation. Our approach introduces a new encoder, known as the convolutional transformer hybrid encoder, to enhance the model's feature extraction capabilities. Additionally, we propose a multi-level fusion module that enables the model to aggregate different levels of detail and semantic information. Furthermore, we present a novel decoupled boundary joint decoder to improve the model's ability to handle the boundary between categories. To evaluate our method, we conducted experiments using the Bird's Eye View point cloud images dataset and Cityscapes dataset. Comparative analysis against stateof-the-art methods demonstrates that our model achieves the highest performance. Specifically, our model achieves an mIoU of 56.26%, surpassing the results of SegFormer with an mIoU of 1.47%. This innovative promises to significantly enhance the efficiency of HD map automatic annotation.

False-Negative Results of Real-Time Reverse-Transcriptase Polymerase Chain Reaction for Severe Acute Respiratory Syndrome Coronavirus 2: Role of Deep-Learning-Based CT Diagnosis and Insights from Two Cases

  • Dasheng Li;Dawei Wang;Jianping Dong;Nana Wang;He Huang;Haiwang Xu;Chen Xia
    • Korean Journal of Radiology
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    • v.21 no.4
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    • pp.505-508
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    • 2020
  • The epidemic of 2019 novel coronavirus, later named as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is still gradually spreading worldwide. The nucleic acid test or genetic sequencing serves as the gold standard method for confirmation of infection, yet several recent studies have reported false-negative results of real-time reverse-transcriptase polymerase chain reaction (rRT-PCR). Here, we report two representative false-negative cases and discuss the supplementary role of clinical data with rRT-PCR, including laboratory examination results and computed tomography features. Coinfection with SARS-COV-2 and other viruses has been discussed as well.

POSS/Polyurethane Hybrids and Nanocomposites: A Review on Preparation, Structure and Performance

  • Diao, Shuo;Mao, Lixin;Zhang, Liqun;Wang, Yiqing
    • Elastomers and Composites
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    • v.50 no.1
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    • pp.35-48
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    • 2015
  • Polyhedral oligomeric silsesquioxane (POSS) is an important inorganic-organic hybrid material with a three-dimensional structure. Polyurethane (PU) is a widely applied polymer that has versatile properties with the change of two phase structure. When POSS is incorporated into PU by physical or chemical methods, many properties can be greatly improved, such as mechanical properties, thermal stability, biodegradation resistance, and water resistance. This paper reviews the recent progress in preparation, structure, and performance of POSS-modified polyurethane from the viewpoint of physical blending and chemical modification.

Laboratory Confirmation of A Suspicious Meningococcal Meningitis Death Case

  • Zhang Tie-Gang;He Xiong;Chen Li-Juan;He Jing-Guo;Luo Ming;Yang Jie;Shao Zhu-Jun;Sun Mei-Ping
    • Journal of Microbiology
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    • v.44 no.4
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    • pp.457-460
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    • 2006
  • A suspicious meningococcal meningitis death case was reported to the Beijing CDC. The blood specimen was analyzed via multi-PCR and MLST. 6 isolates from close contacts were analyzed via PFGE and MLST. According to the results of the above analyses, the cause of this case was identified as a serogroup A Neisseria meningitidis, which, in terms of sequence typing, belonged the ST7 group.

rs10505474 and rs7837328 at 8q24 Cumulatively Confer Risk of Prostate Cancer in Northern Han Chinese

  • Zhang, Lin-Lin;Sun, Liang;Zhu, Xiao-Quan;Xu, Yong;Yang, Kuo;Yang, Fan;Yang, Yi-Ge;Chen, Guo-Qiang;Fu, Ji-Cheng;Zheng, Chen-Guang;Li, Ying;Mu, Xiao-Qiu;Shi, Xiao-Hong;Zhao, Fan;Wang, Fei;Yang, Ze;Wang, Bin-You
    • Asian Pacific Journal of Cancer Prevention
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    • v.15 no.7
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    • pp.3129-3132
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    • 2014
  • Aims: Genome-wide association studies (GWAS) have identified several risk variants for prostate cancer (pCa) mainly in Europeans, which need to be further verified in other racial groups. We selected six previously identified variants as candidates and to define the association with PCa in Northern Han Chinese. Methods: 749 subjects from Beijing and Tianjin in Northern China were included. Six variants (rs10505474, rs7837328, rs4242384, rs7813, rs486907 and rs1058205) were genotyped by high resolution melting (HRM) assays. The individual and cumulative contribution for of the risk of PCa and clinical covariates were analyzed. Results: Among the six candidate variants, onlyrs10505474, and rs7837328, both locating at 8q24 region, were associated with PCa in our population.rs10505474 (A) was associated with PCa ($OR_{recessive}=1.56$, p=0.006); and rs7837328 (A) was associated with PCa ($OR_{dominant}=1.38$, p=0.042/$OR_{recessive}=1.99$, p=0.003). Moreover, we observed a cumulative effects between them ($p_{trend}=2.58{\times}10^{-5}$). The joint population attributable risk showed the two variants might account for 71.85% of PCa risk. In addition, we found the homozygotes of rs10505474 (A) and rs7837328 (A) were associated with PCa clinical covariants (age at onset, tumor stage, respectively) ($p_{age}=0.046$, $P_{tumorstage}=0.048$). Conclusion: rs10505474 (A) and rs7387328 (A) at 8q24 are associated with PCa and cumulatively confer risk, suggesting the two variations could determine susceptibility to PCa in the Northern Chinese Han population.

Nigrospora Species Associated with Various Hosts from Shandong Peninsula, China

  • Hao, Yuanyuan;Aluthmuhandiram, Janith V.S.;Chethana, K.W. Thilini;Manawasinghe, Ishara S.;Li, Xinghong;Liu, Mei;Hyde, Kevin D.;Phillips, Alan J.L.;Zhang, Wei
    • Mycobiology
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    • v.48 no.3
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    • pp.169-183
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    • 2020
  • Nigrospora is a monophyletic genus belonging to Apiosporaceae. Species in this genus are phytopathogenic, endophytic, and saprobic on different hosts. In this study, leaf specimens with disease symptoms were collected from host plants from the Shandong Peninsula, China. The fungal taxa associated with these leaf spots were studied using morphology and phylogeny based on ITS, TEF1, and TUB2 gene regions. In this article, we report on the genus Nigrospora with N. gorlenkoana, N. oryzae, N. osmanthi, N. rubi, and N. sphaerica identified with 13 novel host associations including crops with economic importance such as bamboo and Chinese rose.

Sustaining Low-Carbon Emission Development: An Energy Efficient Transportation Plan for CPEC

  • Zubedi, Asma;Jianqiu, Zeng;Arain, Qasim Ali;Memon, Imran;Khan, Sehrish;Khan, Muhammad Saad;Zhang, Ying
    • Journal of Information Processing Systems
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    • v.14 no.2
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    • pp.322-345
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    • 2018
  • Climate change has become a major challenge for sustainable development of human society. This study is an attempt to analyze existing literature to identify economic indicators that hamper the process of global warming. This paper includes case studies based on various countries to examine the nexus for environment and its relationship with Foreign Direct Investment, transportation, economic growth and energy consumption. Furthermore, the observations are analyzed from the perspective of China-Pakistan Economic Corridor (CPEC) and probable impact on carbon emission of Pakistan. A major portion of CPEC investment is allocated for transportation. However, it is evident that transportation sector is substantial emitter of carbon dioxide (CO2) gas. Unfortunately, there is no empirical work on the subject of CPEC and carbon emission for vehicular transportation. This paper infers that empirical results from various other countries are ambiguous and inconclusive. Moreover, the evidence for the pollution haven hypothesis and the halo effect hypothesis is limited in general and inapplicable for CPEC in particular. The major contribution of this study is the proposal of an energy efficient transportation model for reducing CO2 emission. In the end, the paper suggests strategies to climate researchers and policymakers for adaptation and mitigation of greenhouse gases (GHG).