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Article ; Online: A New Dynamic Analysis Method for Hang’s Mudding-Off Technique based on Circulation Loss in Return

Liu Hong / Liu Pu / Xu Feng-ling / Chen Qiao / Zhu Hong-ling / Su De-gui

E3S Web of Conferences, Vol 143, p

2020 Volume 02049

Abstract: Hang’s mudding-off technique is a well control measure used to maintain the dynamic balance ... in a well shaft, there has been no analytical basis for applying Hang’s mudding-off technique in practice ... and as a result, the technique is typically applied as a “blind Hang”. In this study ...

Abstract	Hang’s mudding-off technique is a well control measure used to maintain the dynamic balance of the pressure inside a well and thus ensure safe operation when there is circulation loss in the return. Given the lack of a dynamic analysis method that reflects the principles of annulus liquid level changes in a well shaft, there has been no analytical basis for applying Hang’s mudding-off technique in practice, and as a result, the technique is typically applied as a “blind Hang”. In this study, a dynamic analysis method was employed to model well shaft leakage loss, based on actual engineering conditions under which Hang’s mudding-off technique is used, and models were developed for the effective height of the well shaft annulus liquid level in Hang’s mudding-off technique and for a safe operation time after the application of the technique. The calculation of variations in the cross-sectional area of the annulus was also addressed. The reliability of the proposed models was evaluated using calculation examples. The error in the calculated effective liquid level height was 1.22% when dynamic leakage loss was considered, and the error in the safe operation time calculation was 3.58%. These results illustrate the accuracy of the models. The analysis method proposed in this paper can be used to solve problems related to calculation of the engineering parameters involved in Hang’s mudding-off technique and averting the risks of well control safety under conditions of circulation loss in the return, thereby optimising Hang’s mudding-off technique and reducing project costs.
Keywords	Environmental sciences ; GE1-350
Subject code	621
Language	English
Publishing date	2020-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The epidemiological characteristics of measles and difficulties of measles elimination in Hang Zhou, China.

Liu, Shijun / Xu, Erping / Zhang, Xioaping / Liu, Yan / Du, Jian / Wang, Jun / Che, Xinren / Gu, Wenwen

Human vaccines & immunotherapeutics

2013 Volume 9, Issue 6, Page(s) 1296–1302

Abstract: Objective: Following the national proclaim of Measles Elimination 2012, plenty of activities for controlling the incidence had practiced in Hangzhou. However, the incidence did not decrease to low degree and remained perform as gap to the elimination ... ...

Abstract	Objective: Following the national proclaim of Measles Elimination 2012, plenty of activities for controlling the incidence had practiced in Hangzhou. However, the incidence did not decrease to low degree and remained perform as gap to the elimination target. The present study aimed to describe the epidemiological characteristics of measles, and proposed reasonable method to the target in Hangzhou. Method: Cases were collected by the National Notiﬁable Diseases Surveillance System (NNDSS) from 2004 to 2011. The descriptive epidemiology was employed to analyze characteristics of measles. Results: A total of 4712 confirmed cases were enrolled by the NNDSS with 7.87 per 100,000 people of incidence rate on average from 2004 to 2011. Individuals lived urban districts had higher risk of measles than counties. Infants aged＜1 year observed the highest incidence rate with 239.35/100,000, and the age-specific incidence rate declined along with aged-group but reversed at adults. 52.20% of cases were floating cases and the measles vaccination was significantly different from the local cases (χ(2)=51.65, p＜ 0.001). February to June was the epidemic period for measles incidence with 81.88% of cases reported in cluster. Conclusion: The descriptive characteristics of measles suggested that factors included infant and adult individual, floating population, and living urban area might be relate to the elimination target. More efforts were need to ensure susceptible population had accepted qualified measles vaccination.
MeSH term(s)	Adolescent ; Adult ; Aged ; Child ; Child, Preschool ; China/epidemiology ; Disease Eradication ; Female ; Human Migration ; Humans ; Incidence ; Infant ; Infant, Newborn ; Male ; Measles/epidemiology ; Measles/prevention & control ; Middle Aged ; Risk Factors ; Urban Population ; Young Adult
Language	English
Publishing date	2013-06-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	2664176-8
ISSN	2164-554X ; 2164-5515
ISSN (online)	2164-554X
ISSN	2164-5515
DOI	10.4161/hv.24032
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Article: Is parental body weight related with their children's overweight and obesity in Gao Hang Town, Shanghai?

Wan, Yanping / Xu, Renying / Feng, Haixia / Zhou, Yiquan / Zhang, Xiaomin / Lu, Liping / Tan, Tao / Jiang, Ying / Chen, Zhiqi / Wu, Yingjie

Asia Pacific journal of clinical nutrition

2015 Volume 24, Issue 3, Page(s) 509–514

Abstract: ... their children's overweight and obesity in school students in Gao Hang Town, Shanghai.: Methods ... A cross-sectional study was performed in five primary schools in Gao Hang Town, Shanghai. Overall, 2,025 sets of parents ...

Abstract	Objectives: This study aimed to evaluate the relationship between parental body weight and their children's overweight and obesity in school students in Gao Hang Town, Shanghai. Methods: A cross-sectional study was performed in five primary schools in Gao Hang Town, Shanghai. Overall, 2,025 sets of parents and their children (7-13 years, 981 boys/1044 girls) were enrolled. Body mass index (BMI) and waist circumference for each child were measured. Age, gender, birth weight, and breastfeeding history was recorded for each child and the BMI of their parents was obtained by a self-completion questionnaire. Overweight (including obesity) was defined as a BMI of >=24.0 kg/m2 in parents and a BMI >=P85 in children according to age- and gender-specific percentiles. Re-sults: The total prevalence of overweight was higher in boys than in girls (35.5% vs 19.5%), while it was the same in fathers compared with mothers (50.6% vs 18.9%). The prevalence of overweight in boys showed a trend with increasing age, but remained stable versus age in girls. Parents were further divided into four subgroups as follows: I) both father and mother had a normal BMI; II) father overweight, mother normal weight; III) father normal weight, mother overweight; IV) both father and mother are overweight. The odds ratio of overweight was 2.26 for group II, 2.71 for group III, and 4.36 for group IV, respectively, compared with group I. Gender, paternal BMI, and maternal BMI were chosen as risk factors for children overweight. Conclusions: Parental BMI affects their offspring overweight and obesity in Chinese school students.
MeSH term(s)	Adolescent ; Body Weight ; Child ; China/epidemiology ; Cross-Sectional Studies ; Female ; Humans ; Male ; Odds Ratio ; Overweight/epidemiology ; Parents ; Pediatric Obesity/epidemiology ; Prevalence ; Risk Factors ; Sex Distribution ; Surveys and Questionnaires
Language	English
Publishing date	2015
Publishing country	Australia
Document type	Journal Article
ZDB-ID	1460012-2
ISSN	0964-7058
ISSN	0964-7058
DOI	10.6133/apjcn.2015.24.3.09
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Book: Ying Han hang kong tu jie ci dian

Kumar, Bharat / De Remer, Dale / Xu, Yuanming

Illustrated dictionary of aviation

2009

Title variant	Cover title also in English: Illustrated dictionary of aviation
Author's details	Kumaer, Deleimu bian; Xu Yuanming yi; Han Shijie shen
Keywords	Aeronautics
Language	Chinese
Size	553 S, 27 cm
Publisher	Hang kong gong ye chu ban she
Publishing place	Beijing
Document type	Book
ISBN	7802433967 ; 9787802433960
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Article ; Online: An approach to analyzing spatial patterns of protozoan communities for assessing water quality in the Hangzhou section of Jing-Hang Grand Canal in China.

Shi, Xinlu / Liu, Xiaojiang / Liu, Guijie / Sun, Zhiqiang / Xu, Henglong

Environmental science and pollution research international

2011 Volume 19, Issue 3, Page(s) 739–747

Abstract: Introduction: In order to evaluate water quality of a canal system, the spatial pattern of protozoan communities in response to physicochemical variables was studied in the Hangzhou section of the Grand Canal, northern China during a 1-year cycle ( ... ...

Abstract	Introduction: In order to evaluate water quality of a canal system, the spatial pattern of protozoan communities in response to physicochemical variables was studied in the Hangzhou section of the Grand Canal, northern China during a 1-year cycle (February 2008-January 2009). Materials and methods: Protozoan samples were monthly collected at six sampling stations with a spatial gradient of environmental status. Physicochemical parameters, e.g., water temperature, dissolved oxygen, chemical oxygen demand (COD), biological oxygen demand, total nitrogen (TN), and total phosphorus (TP), were measured synchronously for comparison with biotic parameters. Results: The protozoan community structures represented significant differences among the six sampling stations. The spatial patterns of protozoan communities were significantly correlated with the changes of chemical variables, especially COD, either alone or in combination with TP and/or TN. Of 88 protozoan taxa recorded over the study period, ten species (e.g., Carchesium polypinum, Colpidium campylum, Prorodon teres, Vorticella putrina, Zoothamnium arbuscula, Euglena spp., and Phacus spp.) were significantly related to COD, either alone or in combination with TP and/or TN. Conclusion: These findings suggest that protozoa can be used as a robust bioindicator of water quality in freshwater river systems.
MeSH term(s)	Biological Oxygen Demand Analysis ; Chemical Phenomena ; China ; Cilia/metabolism ; Ciliophora/classification ; Ciliophora/cytology ; Ciliophora/genetics ; Ciliophora/isolation & purification ; Ecosystem ; Environmental Monitoring/methods ; Euglenida/classification ; Euglenida/cytology ; Euglenida/genetics ; Euglenida/isolation & purification ; Flagella/metabolism ; Fresh Water/chemistry ; Fresh Water/parasitology ; Nitrogen/analysis ; Oxygen/analysis ; Oxygen/chemistry ; Phosphorus/analysis ; Phylogeny ; Principal Component Analysis ; Rivers/chemistry ; Rivers/parasitology ; Seasons ; Solubility ; Temperature ; Water Quality
Chemical Substances	Phosphorus (27YLU75U4W) ; Nitrogen (N762921K75) ; Oxygen (S88TT14065)
Language	English
Publishing date	2011-09-17
Publishing country	Germany
Document type	Comparative Study ; Evaluation Study ; Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-011-0615-0
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Book: Zhang dai "ye hang chuan" yan jiu

Xu, Shizhen

jian lun wan ming wen ren zhi shi ti xi yu shen mei yi shi

(Gu dian wen xian yan jiu ji kan : 古典文獻研究輯刊 ; : chu bian / Pan mei yue, du jie xiang zhu bian ; 39)

2005

Author's details	Xu shi zhen
Series title	Gu dian wen xian yan jiu ji kan : 古典文獻研究輯刊 : chu bian / Pan mei yue, du jie xiang zhu bian ; 39
Language	Chinese
Size	2, 211 S, Ill
Edition	Di 1 ban
Publisher	Hua mu lan wen hua gong zuo fang
Publishing place	Yong he, Tai bei
Document type	Book
ISBN	9867128060 ; 9789867128065
Database	Former special subject collection: coastal and deep sea fishing

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Article ; Online: Using Kernel Method to Include Firm Correlation for Stock Price Prediction

Hang Xu

Computational Intelligence and Neuroscience, Vol

2022 Volume 2022

Abstract: In this work, we propose AGKN (attention-based graph learning kernel network), a novel framework to incorporate information of correlated firms of a target stock for its price prediction in an end-to-end way. We first construct a stock-axis attention ... ...

Abstract	In this work, we propose AGKN (attention-based graph learning kernel network), a novel framework to incorporate information of correlated firms of a target stock for its price prediction in an end-to-end way. We first construct a stock-axis attention module to extract dynamic and asymmetric spatial correlations through the kernel method and a graph learning module into which more accurate information can be integrated. An ensemble time-axis attention module is then applied to learn temporal correlations within each stock and market index. Finally, we utilize a transformer encoder to jointly attend to obtain information from different levels for correlations’ aggregation and prediction. Experiments with data collected from the Chinese stock market show that AGKN outperforms state-of-the-art baseline methods, making up to 4.3% lower error than the best competitors. The ablation study shows that AGKN pays more attention to hidden correlation between stocks, which improves model’s performance greatly.
Keywords	Computer applications to medicine. Medical informatics ; R858-859.7 ; Neurosciences. Biological psychiatry. Neuropsychiatry ; RC321-571
Subject code	006
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	Hindawi Limited
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Using Kernel Method to Include Firm Correlation for Stock Price Prediction.

Xu, Hang

Computational intelligence and neuroscience

2022 Volume 2022, Page(s) 4964394

Abstract	In this work, we propose AGKN (attention-based graph learning kernel network), a novel framework to incorporate information of correlated firms of a target stock for its price prediction in an end-to-end way. We first construct a stock-axis attention module to extract dynamic and asymmetric spatial correlations through the kernel method and a graph learning module into which more accurate information can be integrated. An ensemble time-axis attention module is then applied to learn temporal correlations within each stock and market index. Finally, we utilize a transformer encoder to jointly attend to obtain information from different levels for correlations' aggregation and prediction. Experiments with data collected from the Chinese stock market show that AGKN outperforms state-of-the-art baseline methods, making up to 4.3% lower error than the best competitors. The ablation study shows that AGKN pays more attention to hidden correlation between stocks, which improves model's performance greatly.
MeSH term(s)	Investments ; Learning ; Neural Networks, Computer
Language	English
Publishing date	2022-04-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	2388208-6
ISSN	1687-5273 ; 1687-5273
ISSN (online)	1687-5273
ISSN	1687-5273
DOI	10.1155/2022/4964394
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Article ; Online: Synthesis of cobalt phosphide hybrid for simultaneous electrochemical detection of ascorbic acid, dopamine, and uric acid.

Xu, Hongyan / Hang, Yulu / Lei, Xiaoyu / Deng, Jinan / Yang, Jun

RSC advances

2024 Volume 14, Issue 21, Page(s) 14665–14671

Abstract: Ascorbic acid (AA), dopamine (DA), and uric acid (UA) are important biomarkers for the clinical screening of diseases. However, the simultaneous determination of these three analytes is still challenging. Herein, we report a facile metal-organic ... ...

Abstract	Ascorbic acid (AA), dopamine (DA), and uric acid (UA) are important biomarkers for the clinical screening of diseases. However, the simultaneous determination of these three analytes is still challenging. Herein, we report a facile metal-organic framework (MOF)-derived method to synthesize a cobalt phosphide (Co
Language	English
Publishing date	2024-05-03
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d4ra01702a
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Article ; Online: The delta-fluvial evolution of a lacustrine basin with gentle slope and low sedimentation rate: A case study of the Fudong Slope, Junggar Basin, Northwest China

Wei, Zede / Li, Shengli / Zhang, Tong / Liu, Yong / Yao, Zongquan / Xu, Wenqian / Li, Hang

Elsevier B.V. Sedimentary Geology. 2023 July, v. 453 p.106441-

2023

Abstract: Gentle slope belts of lacustrine basins are important areas for the generation of stratigraphic ... Formation (J₂t) in the Fudong slope of the Junggar Basin were analysed. The results indicated ... that the Fudong slope showed the characteristics of low sediment input. Sediments mainly originated from the Shaqi ...

Abstract	Gentle slope belts of lacustrine basins are important areas for the generation of stratigraphic petroleum reservoirs controlled by sedimentary systems. Based on coring, well logging, 3D seismic and analytical test data, the sedimentary system and sandbody distribution characteristics of the Jurassic Toutunhe Formation (J₂t) in the Fudong slope of the Junggar Basin were analysed. The results indicated that the Fudong slope showed the characteristics of low sediment input. Sediments mainly originated from the Shaqi uplift, and the sediment input gradually weakened from the early to the late J₂t stages. The sedimentary system evolved from a delta to a meandering river, resulting in a delta front facies in the 1st member (J₂t₁) and a meandering river facies in the 2nd (J₂t₂) and 3rd (J₂t₃) members of the Toutunhe Formation. A sedimentary evolution pattern for the gentle slope with low sediment input was established. Thick deltaic sandbodies developed locally in the J₂t₁ stage. However, meandering rivers with high sinuosities predominantly developed and resulted in a striped geometry in the J₂t₂ and J₂t₃ members. Moreover, the meandering sandbodies exhibited an anastomosing morphology after multistage superposition. The channel and point bar facies in J₂t₂ were more developed than those in J₂t₃ because of sediment input differences. Under low-sediment input conditions, the sedimentary environment of the gentle slope belt in the lacustrine basin was controlled by changes in the palaeoclimate, palaeogeomorphology, gradient (slope) and base level. Palaeoclimate was the main factor controlling the evolution of the sedimentary environment. Palaeogeomorphology and slope controlled the distribution of sedimentary microfacies, channel sinuosity and sandbodies. Base-level change restricted the sandbody superimposition style. Under the low sediment input conditions of the Fudong slope, the subaqueous distributary channels of the delta environment and the point bars of the meandering river environment in the transitional belt of the Fudong slope are the main potential targets for stratigraphic petroleum reservoirs, whilst the 2nd member of the Toutunhe Formation (J₂t₂) is the main favourable interval for stratigraphic reservoir exploration.
Keywords	Jurassic period ; basins ; case studies ; evolution ; geometry ; geophysics ; paleoclimatology ; petroleum ; rivers ; sedimentation rate ; sediments ; China ; Gentle slope belt of a lacustrine basin ; Sedimentary evolution ; Low sediment input ; Controlling factors ; The Fudong slope of the Junggar Basin
Language	English
Dates of publication	2023-07
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	216739-6
ISSN	0037-0738
ISSN	0037-0738
DOI	10.1016/j.sedgeo.2023.106441
Database	NAL-Catalogue (AGRICOLA)

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