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Encapsulated boron-based energetic spherical composites with improved reaction efficiency and combustion performance

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CHEMICAL ENGINEERING JOURNAL 2022年第Part1期433卷 134478-134478页

作者： Hu, Yinghui Wang, xuwen Zhang, Jian Zhu, Zhaoyang Ren, Xiaoting Yang, Yulin lin, Kaifeng Pang, Aimin Shuai, Yong Harbin Inst Technol Sch Chem & Chem Engn MIIT Key Lab Crit Mat Technol New Energy Convers Harbin 150001 Peoples R China Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China Hubei Inst Aerosp Chemotechnol Sci & Technol Aerosp Chem Power Lab Xiangyang 441003 Hubei Peoples R China

The low energy release efficiency seriously hinders the application of Boron (B) powder as metal fuel in solid propellants. To overcome this issue, a series of B-based spherical composites were produced by encapsulating B based metastable intermixed composites (MICs) with ammonium perchlorate (AP) by a solvent evaporation induced self-assembly (EISA) method in this work. A self-developed combustion system containing an ignition pool, indicator light, and high-speed camera to precisely monitor ignition delay and burning times was utilized. The EISA-prepared B/Bii(2)O(3)/AP spherical composites showed higher combustion temperature (1435 ?) and shorter ignition delay time (379 & PLUSMN;25 ms) than the physically mixed sample (1264 ? and 1035 & PLUSMN;63 ms). The isolated reaction units of spherical B/Bi2O3/AP composite accelerated heat transfer and accumulation and reduced sintering and agglomeration, thus promoting the combustion efficiency of B powder. This study presents a promising strategy by doping and encapsulating process to increase the combustion performance of B-based metal fuel.

关键词： Boron-based Energetic Composites Encapsulated Structure EISA Method Combustion Performance Reaction Mechanism

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A Three-Dimensional Cyclic Multiplication - Convolution Neural Network for Hyperspectral Image Classification

A Three-Dimensional Cyclic Multiplication - Convolution Neur...

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Symposia and Workshops on Ubiquitous, Autonomic and Trusted Computing, UIC-ATC

作者： Xiaorui Xiong Zihan Huang Zhongyin Sheng Zihan Xu xuwen He Qiaoling lin School of Mathematics and Computer Science Wuhan Polytechnic University Wuhan China

Hyperspectral images have a large amount of spectral and spatial information, and play a significant role in remote sensing. However, the traditional image classification techniques are no longer applicable to the developing hyperspectral remote sensing images, and how to reasonably utilize the rich feature information of hyperspectral images to obtain high-accuracy classification results has become one of the most important research topics at present. This paper proposes a new 3D convolutional neural network to solve the problem of feature wastage in hyperspectral images. The framework cycles the convolutional kernel size, and the number of convolutional kernels increases in a multiplicative relationship for hyperspectral image classification (CM-CNN). Compared with existing neural network frameworks on different datasets, CMCNN achieves the highest Kappa coefficient and confusion matrix accuracy, which are stable at above 95%. From the classification results, there are almost no obvious classification errors.

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FETAL TYPE CLASSIFICATION BASED ON FETAL ELECTROCARDIOGRAPH IN NON-STRESS TESTS

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JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY 2021年第9期21卷 2140052-2140052页

作者： Liu, Jianli Yang, Yimin Zhang, Song Li, xuwen Yang, lin Hao, Dongmei Beijing Univ Technol Fac Environm & Life Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100024 Peoples R China

Electronic fetal heart rate (FHR) monitoring is a technical means to evaluate the state of the fetus in the uterus by monitoring FHR. The main purpose is to detect intrauterine hypoxia and take corresponding medical measures timely. Because the fetus sleeps quietly for up to 1 hour sometimes, ultrasound Doppler is not easy to continuously detect for a long time. The electronic fetal monitor obtains the fetal heart rate, which not only improves the accuracy and comfort, but also the convenient implementation of long-term monitoring. It is beneficial to reduce perinatal fetal morbidity and mortality. This study used maternal-fetal Holter monitor which is based on the technology of fetal electrocardiograph (FECG) to collect the FHR, and then design algorithm to extract the baseline FHR, acceleration, variation, sleep-wake cycle and nonlinear parameters. There were significant differences in the 22 parameters between the normal and the suspicious group. Using the 22 characteristic parameters, the support vector machine was used to classify the normal and the suspected group of fetuses. 80% of the data was used to train a classification model. The remaining 20% of the data was used as a test set and its accuracy reached 93.75%.

关键词： Fetal Holter monitor fetal heart rate support vector machine

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Establishment of a personalized fetal growth curve model

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TECHNOLOGY AND HEALTH CARE 2021年第1_suppl期29卷 S311-S317页

作者： Bao, Xinyu Wang, Yan Zhang, Song Yang, lin Liu, Guoli Yang, Yimin Li, xuwen Hao, Dongmei Chen, Aiqing Liu, Xiaohong Shao, Jing Beijing Univ Technol Fac Environm & Life Sci Beijing 100124 Peoples R China Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100124 Peoples R China Peking Univ Peoples Hosp Beijing 100044 Peoples R China Beijing Yes Med Devices Co Ltd Beijing 100152 Peoples R China

BACKGROUND: Fetal weight is one of the important indicators for judging whether fetal growth and development are normal. Fetal weight exceeding the normal range may lead to poor delivery outcomes. OBJECTIVE: We aimed to establish a personalized fetal growth curve in order to effectively monitor fetal growth during pregnancy. Fetal weight can be monitored while fetal growth and development are assessed. METHODS: This study retrospectively analyzed the birth weight and ultrasound database of 3,093 newborns delivered at normal term. The personalized fetal growth curve model was generated based on the birth weight formula established by Gardosi combined with the proportional weight equation. RESULTS: (1) The average birth weight of the single fetus at normal term was 3,457g. (2) According to the regression results of the proportion of fetal weight in full-term pregnancy and gestational week, the proportional weight equation is Weight% = 500.9 + 51.60GA + 1.727GA(2) 0.01718GA(3) (GA is gestational week), R-2 is 98%, P < 0.001. CONCLUSIONS: In this study, the normal birth weight of newborns and normal range of fetal weight can be estimated by using the personalized fetal growth curve model.

关键词： Fetal weight fetal growth curve birth weight proportional weight equation normal range

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Fibrin gel-assisted stone extraction in retrograde intrarenal surgery

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BJU INTERNATIONAL 2022年第2期129卷 170-173页

作者： Yu, Yue Xi, Haibo Chen, Yujun Li, xuwen Liu, Wei Hu, Jieping Deng, Jun Liu, Xiaoqiang lin, Longhui Li, Chen Wang, Mengzhen Fu, Bin Wang, Gongxian Kuang, Renrui Zhou, Xiaochen Nanchang Univ Affiliated Hosp 1 Dept Urol Nanchang Jiangxi Peoples R China

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Fetal growth prediction: Establishing fetal growth prediction curves in the second trimester

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TECHNOLOGY AND HEALTH CARE 2021年第1_suppl期29卷 S345-S350页

作者： Wang, Yan Bao, Xinyu Zhang, Song Yang, lin Liu, Guoli Yang, Yimin Li, xuwen Hao, Dongmei Chen, Aiqing Liu, Xiaohong Shao, Jing Peking Univ Peoples Hosp Beijing 100044 Peoples R China Beijing Univ Technol Fac Environm & Life Sci Beijing 100124 Peoples R China Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100124 Peoples R China Beijing Yes Med Devices Co Ltd Beijing 100152 Peoples R China

BACKGROUND: Monitoring fetal weight during pregnancy has a guiding role in prenatal care. OBJECTIVE: To establish a personalized fetal growth curve for effectively monitoring fetal growth during pregnancy. METHODS: (1) This study retrospectively analyzed the birth weight database of 2,474 singleton newborns delivered normally at term. The personalized fetal growth curve model was formed by combining the estimating birth weight of newborns with the proportional weight formula. (2) Multiple linear stepwise regression method was used to estimate the birth weight of newborns. RESULTS: (1) Delivery gestational age, weight at first visit, maternal height, pre-pregnancy body mass index, fetal sex, parity had significant effects on birth weight. Based on these parameters, the formula for calculating term optimal weight was obtained (R-2 = 22.8%, P < 0.001). (2) The personalized fetal growth curve was obtained according to the epidemiological factors input model of each pregnant woman. CONCLUSIONS: A model of personalized fetal growth curve can be established, and be used to evaluate fetal growth and development through estimated fetal weight monitoring.

关键词： Fetal weight growth charts personal health services

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Economic evaluation of varicella vaccination strategies in Jiangsu province, China: a decision-tree Markov model

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HUMAN VACCINES & IMMUNOTHERAPEUTICS 2021年第11期17卷 4194-4202页

作者： Wang, Qiang Xiu, Shixin Yang, Liuqing Huang, Jinxin Cui, Tingting Shi, Naiyang Wang, xuwen Shen, Yuan Chen, Enpin Lu, Bing Jin, Hui lin, Leesa Southeast Univ Sch Publ Hlth Dept Epidemiol & Hlth Stat 87 Dingjiaqiao Nanjing 210009 Peoples R China Southeast Univ Sch Publ Hlth Key Lab Environm Med Engn Minist Educ Nanjing Peoples R China Wuxi Ctr Dis Control & Prevent Dept Immunizat Planning Wuxi Jiangsu Peoples R China London Sch Hyg & Trop Med Dept Infect Dis Epidemiol London England Hong Kong Sci Pk Lab Data Discovery Hlth D24H Hong Kong Peoples R China

This study evaluated different varicella vaccination strategies in Jiangsu province, China. A decision-tree Markov model was used to evaluate the cost effectiveness of various varicella vaccination strategies for children, including direct and selective vaccination (serotesting pre-vaccination). A cohort of one-year-old children was followed through 60 one-year Markov cycles. The parameter estimation was based on field work, the literature, and statistical yearbooks. We calculated the incremental cost-utility ratio (ICUR) using the saved quality-adjusted life year (QALY). One-way and probability sensitivity analyses were performed to assess uncertainty. Among 100,000 cohort members, one-dose and two-dose direct vaccination averted 8061 and 10,701 varicella cases, respectively, compared with no vaccination. Furthermore, compared with no vaccination, one-dose and two-dose direct vaccination saved one QALY at the ICUR of USD 21,401.33 and USD 35,420.81, respectively, at less than three times the per capita gross domestic product (USD 47,626.86) of Jiangsu. The ICURs of the one-dose and two-dose selective strategies versus no vaccination were USD 42,623.62 and USD 51,406.35 per QALY gained, respectively. The cost effectiveness results were most sensitive to the QALY loss of outpatients and vaccine prices. Thus, in Jiangsu, one-dose and two-dose direct varicella vaccination in children could be cost effective at the willingness to pay threshold of three times provincial GDP per capita from a societal perspective. The findings were sensitive to the vaccine price and health utility of varicella cases.

关键词： Varicella vaccination children cost utility decision tree model China

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新生儿脾破裂保脾手术1例

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中华小儿外科杂志 2024年第11期45卷 1050-1051页

作者：赵伟赵绪稳齐晓敏张骜马林程红莲尚华胡博天津大学附属儿童医院(天津市儿童医院)新生儿外科天津300074

男, 日龄2 d, 因"腹胀、吃奶差24小时"来天津大学附属儿童医院新生儿内科。患儿系第2胎第2产, 胎龄38周+1, 于外院产科经阴道自然分娩, 具体产程家属不清楚, 出生体重为3.9 kg。否认宫内窘迫、胎膜早破, 否认羊水、脐带及胎... 详细信息

男, 日龄2 d, 因"腹胀、吃奶差24小时"来天津大学附属儿童医院新生儿内科。患儿系第2胎第2产, 胎龄38周+1, 于外院产科经阴道自然分娩, 具体产程家属不清楚, 出生体重为3.9 kg。否认宫内窘迫、胎膜早破, 否认羊水、脐带及胎盘异常。母体孕期无慢性病史、无用药史及无外伤史。出生Apgar评分不详。入院时精神反应差, 全身皮肤呈贫血貌, 腹胀, 无压痛, 四肢末梢凉, 股动脉搏动弱, 毛细血管充盈时间>4 s。实验室检查:静脉血气分析pH<6.75, 碱剩余测不出, 血红蛋白为22 g/L, 凝血酶原时间为20.3 s, 活化部分凝血酶原时间为74.2 s, 乳酸浓度为31.38 mmol/L。患儿入院后即刻液体复苏、呼吸机支持及输血治疗。急查床旁B型超声提示脾区缺血改变、腹腔大量积液(积血可能)。为进一步明确患儿病情, 完善腹部增强CT示考虑脾破裂可能, 腹盆腔大量积液(积血)。患儿诊断明确后转入本院新生儿外科进一步诊疗。

关键词：附属儿童医院宫内窘迫胎膜早破慢性病史新生儿外科四肢末梢用药史胎盘异常

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Modelling the Public Perception of Urban Public Space Lighting Based on SDGSAT-1 Glimmer Imagery: A Case Study in Beijing, China

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SUSTAINABLE CITIES AND SOCIETY 2023年 88卷

作者： lin, Zirong Jiao, Weili Liu, Huichan Long, Tengfei Liu, Yongkun Wei, Shengrong He, Guojin Trop, Tamar Portnov, Boris A. Liu, Ming Li, xuwen Wen, Chunhui Chinese Acad Sci Aerosp Informat Res Inst Beijing 100094 Peoples R China Int Res Ctr Big Data Sustainable Dev Goals CBAS Beijing 100094 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Chinese Acad Forestry CAF Inst Forest Resource Informat Tech Beijing 100091 Peoples R China Natl Forestry & Grassland Adm Key Lab Forestry Remote Sensing & Informat Syst Beijing 100091 Peoples R China Univ Haifa Dept Nat Resources & Environm Management IL-3498838 Haifa Israel Dalian Univ Technol Sch Architecture & Fine Art Dalian 116024 Peoples R China McGill Univ Dept Mech Engn Montreal PQ H3A 0G4 Canada

Public space lighting is important for public perception, human health and urban planning. Previous studies used nighttime light remote sensing data to evaluate light pollution and its impacts on human health, few investigated the impact on public perception. This study combines Beijing's SDGSAT-1 imagery with ground-measured and public perception data to evaluate the feasibility of SDGSAT-1 images simulating public perception. First, ground measurements were performed to collect light attributes and questionnaires were distributed to assess public safety and comfort. Next, the relationship between SDGSAT-1 image and measured illuminance was established. Lastly, public perception in Beijing was estimated. The results show that, (1) public perception is affected by panoramic illuminance, uniformity, and blue light;(2) although illuminance is positively related to public perception, it shows diminishing marginal returns;(3) a strong correlation is found between panoramic illu-minance and SDGSAT-1 image;(4) the perception map shows that most areas in Beijing can provide safe and comfortable lighting, while there are also insufficient or overlit in some places. This study explores methods for assessing public perceptions by satellite data, indicates remote sensing can provide a larger-scale and quanti-tative evaluation of public perception, which can contribute to urban lighting design and sustainable development.

关键词： Public space lighting Public perception Nighttime light remote sensing SDGSAT-1 imagery Sustainable development

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Investigation of anionic group effects on the shale inhibition performance of fatty acid-based ionic liquids and their inhibition mechanism

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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 2022年第0期636卷 128135-128135页

作者： Jia, Han Wang, Shaoyan Wang, Zhe Wang, Qiang Jia, Haidong Song, lin Qin, xuwen Fan, Fangning Li, Zhe Huang, Pan China Univ Petr East China Key Lab Unconvent Oil & Gas Dev Minist Educ Qingdao 266580 Peoples R China China Univ Petr East China Shandong Key Lab Oilfield Chem Sch Petr Engn Qingdao 266580 Peoples R China Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada

Ionic liquids (ILs) have been introduced as novel high-performance shale inhibitors. The inhibition performance and mechanism of the cation groups in ILs have been widely investigated, whereas the effects of the anionic groups in ILs on the inhibitory capacity have rarely been reported. In this work, a series of fatty acid-based ionic liquids (FAILs) with different anionic groups, methyltrioctylammonium octanoate ([N8881][C8:0]), methyltrioctylammonium laurate ([N8881][C12:0]), and methyltrioctylammonium palmitate ([N8881][C16:0]), were synthesized to evaluate their inhibition ability via the sodium bentonite (Na-Bent) immersion test, the linear swelling test, and the shale hot-rolling recovery test. Compared with the traditional inhibitor KCl (2 wt%), FAIL [N8881][C8:0] showed greater inhibition performance at a much lower concentration (0.1 wt%). The inhibition mechanism of FAILs was further analysed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), zeta potential measurements, and contact angle measurements. It was speculated that the best inhibition ability and thermal stability of [N8881][C8:0] should be attributed to the intensive interaction and the sizematching effect between cationic and anionic groups. The present study provided novel insight into the research and development of high-efficiency shale inhibitors.

关键词： Shale inhibitor Fatty acid-based ionic liquids Size-matching effect Intermolecular interaction Inhibition mechanism

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