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Tsien and His Work on Mechanics①

Tan Qingming

Strategic Study of CAE 2001, Volume 3, Issue 10,   Pages 1-6

Abstract: Tsien to modern mechanics and engineering sciences, especially his work on a series of key problems in

Keywords： Hsue-Shen Tsien     mechanics     engineering sciences    

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Intra-abdominal hypertension is an independent cause of acute renal failure after orthotopic liver transplantation

SHU Ming, PENG Chenghong, CHEN Hao, SHEN Boyong, ZHOU Guangwen, SHEN Chuan, LI Hongwei

Frontiers of Medicine 2007, Volume 1, Issue 2,   Pages 167-172 doi: 10.1007/s11684-007-0031-5

Abstract: An independent association between acute renal failure (ARF) and intra-abdominal hypertension (IAH) after liver transplantation has not been established previously. The aim of this retrospective study was to understand the role of IAH as an independent risk factor for ARF in the early postoperative period. This study involved 62 subjects who underwent liver transplantation. Intra-abdominal pressure (IAP) was measured in the first three days after surgery by using the urinary bladder technique. An IAP of at least 20 mmHg per day was defined as IAH. Clinical parameters between group IAH and group NO-IAH were compared in terms of the incidence of ARF, blood creatinine levels, blood urea nitrogen (BUN) levels, urine volume per hour and glomerular filtration gradient (GFG). Hemodynamic variations were recorded in the first three postoperative days between group ARF and group NO-ARF. The perioperative suspected risk factors of ARF were determined for statistical evaluation using correlation coefficients and logistic regression analysis. In group IAH, 45.8% patients developed ARF as against 7.9% in group NO-IAH; GFG was significantly lower at 0 72 h after surgery; and blood creatinine levels, BUN levels, urine volume per hour were significantly different at 24 72 h after surgery compared with group NO-IAH. The patients with ARF were not significantly different from those without ARF in terms of central venous pressure, pulmonary artery pressure and mean arterial pressure (MAP) in the first three postoperative days despite a significant increase in heart rate at 24 72h after operation. Postoperative IAH, intraoperative MAP and intraoperative blood transfusion volume of more than 15 U were found to be independent risk factors for ARF. IAH impaired renal function and was an independent risk factor for ARF after liver transplantation. Routine measurement should be taken to monitor IAP every eight hours postoperatively.
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New Trends in Intelligent Manufacturing

Liang Gao, Weiming Shen, Xinyu Li

Engineering 2019, Volume 5, Issue 4,   Pages 619-620 doi: 10.1016/j.eng.2019.07.001

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Managing stakeholder dynamics and complexity in mega infrastructure projects

Geoffrey Qiping SHEN, Jin XUE

Frontiers of Engineering Management 2021, Volume 8, Issue 1,   Pages 148-150 doi: 10.1007/s42524-020-0149-6

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Comparative study of oscillating flow characteristics of cryocooler regenerator at low temperatures

Yonglin JU , Qingqing SHEN ,

Frontiers in Energy 2009, Volume 3, Issue 1,   Pages 80-84 doi: 10.1007/s11708-009-0008-y

Abstract: A brief review is presented on previous experimental results and correlations on the friction factor of cryocooler regenerators operating at oscillating flow and pulsating pressure conditions, for different mesh sizes of packed woven screens, focusing on the effects of different operating frequencies ranging from 20 to 80 Hz, at room and cryogenic temperatures. A comparison of the friction factor data with those of other studies is presented to clarify the reason for the difference. Finally, a new oscillating flow correlation of regenerators, in terms of several non-dimensional parameters, is discussed and compared.

Keywords： friction factor     regenerator     oscillating flow     high frequency    

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Fuzzy cascade control based on control’s history for superheated temperature

WANG Guangjun, LI Gang, SHEN Shuguang

Frontiers in Energy 2007, Volume 1, Issue 3,   Pages 285-289 doi: 10.1007/s11708-007-0040-8

Abstract: To address the characteristics of the large delay and uncertainty of superheated temperature, a new cascade control system is presented based on control’s history. Based on the analysis of the control objects’ dynamic characteristics, historical control information (substituting for the deviation change rate) is used as the basis for decision-making of the fuzzy control. Therefore, the changing trend of the controlled variable can be accurately reflected. Furthermore, a proportional component is introduced, the advantages of PID and fuzzy controllers are integrated, and the structure weaknesses of conventional fuzzy controllers are overcome. Simulation shows that this control method can effectively reduce the adverse impact of the delay on control effects and, therefore, exhibit strong adaptability by comparing the superheated temperature control system by this controller with PID and conventional fuzzy controllers.
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Current techniques for assessing developmental neurotoxicity of pesticides

GAO Yu, TIAN Ying, SHEN Xiaoming

Frontiers of Medicine 2008, Volume 2, Issue 4,   Pages 337-343 doi: 10.1007/s11684-008-0064-4

Abstract: Organophosphates (OPs) and Pyrethroids (PRY) have been widely used in agriculture and in the home as broad spectrum insecticides, but may produce considerable risk to human health, especially to children. Children are more susceptible to environmental exposure, and concern about the neurotoxic effects of pesticide exposure on children is increasing. There is a need for better understanding of the potential developmental neurotoxicity of pesticides. Techniques for assessing developmental neurotoxicity of pesticides will continue to be developed, rendering a need for flexibility of testing paradigms. Current techniques used in evaluating the developmental neurotoxicity of OPs and PRY are presented in this review. These include: (1) techniques (PC12 cells, C6 cells and other cell models); (2) Non-mammalian models (sea urchins, zebrafish and other non-mammalian models); and (3) mammalian models (morphological techniques, neurobehavioral assessments and biomarkers).

Keywords： paradigms     Pyrethroids     non-mammalian     susceptible     morphological    

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Effect of fine solid particles on absorption rate of gaseous CO

LU Sumin, MA Youguang, SHEN Shuhua, ZHU Chunying

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 4,   Pages 368-372 doi: 10.1007/s11705-008-0067-3

Abstract: The influence of the properties of solid particles in slurry on the absorption of CO in the slurry was investigated in a stirred thermostatic reactor. The absorption experiments were carried out in three different slurries consisting of water, cyclohexane and soybean oil, respectively, and three kinds of solid particles (active carbon, active alumina and silica gel) were incorporated into each of the above mentioned slurries separately. The experimental results show that the active carbon particles could enhance the absorption rate of gaseous CO in the aqueous slurry, while in the cyclohexane slurry, active carbon particles indicated no the absorption enhancement effect. However, it was observed that the active alumina and silica gel particles could enhance the absorption rate of CO in the cyclohexane slurry. These phenomena indicate that the solid particles, which could enhance the gaseous CO absorption rate, should possess two properties simultaneously, i.e. they rejected the solvent and had higher adsorption capacity for the solute. The experimental results also show that, as for those solid particles which could enhance the gas absorption rate, the enhancement increased quickly with the increase of solid concentration in slurry at first, and then reached a constant value gradually. It was also found that the enhancement factor was related to the coverage fraction of solid particles on the gas-liquid interface, and due to the reduction of surface fraction with increasing stirred speed, the enhancement factor decreased.

Keywords： constant     influence     soybean     solvent     concentration    

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Effect of concrete creep and shrinkage on tall hybrid-structures and its countermeasures

Pusheng SHEN, Hui FANG, Xinhong XIA

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 234-239 doi: 10.1007/s11709-009-0020-7

Abstract: This paper aims to study the different vertical displacements in tall hybrid-structures and the corresponding engineering measures. First, the method to calculate the different vertical displacements in tall hybrid-structures is presented. This method takes into account the effects of construction process by applying loads sequentially story by story. Based on the concrete creep and shrinkage calculation formula in American Concrete Institute (ACI) code, with the assumption that loads are increased linearly in members, the creep and shrinkage effects of members are analyzed by adopting two parameters named average load-aged coefficient and average age-last coefficient. The effects of steel ratio on members creep are analyzed by age-adjusted module method (AEMM). The effects that core-tube were constructed in advance to outer steel frame were also considered. Then, based on the sample calculation, the measures to effectively reduce the different vertical displacements in hybrid-structures are proposed. This method is simple and practical in the calculation of different vertical displacements in tall and super-tall hybrid-structures.

Keywords： creep     shrinkage     construction process     hybrid-structure    

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Aortic aneurysm and chronic disseminated intravascular coagulation: a retrospective study of 235 patients

Yun Zhang,Chen Li,Min Shen,Bao Liu,Xuejun Zeng,Ti Shen

Frontiers of Medicine 2017, Volume 11, Issue 1,   Pages 62-67 doi: 10.1007/s11684-017-0498-7

Abstract:

Chronic disseminated intravascular coagulation (DIC) is a rare but devastating complication of aortic aneurysm (AA). This study investigated the clinical manifestations, laboratory findings, and treatment of patients with AA-associated chronic DIC (AA-DIC) and explored the mechanisms, duration, and therapeutic response of AA-DIC. We retrospectively reviewed the medical records of 235 AA patients admitted at the Peking Union Medical College Hospital between September 2009 and January 2015. The patients were classified as those with DIC (AA-DIC) and those without DIC (non-DIC). The AA-DIC group showed a significantly higher proportion of female patients and a significantly longer AA disease course than the non-DIC group did. The AA-DIC patients presented mural thrombi, dissecting aneurysms, a family history of AA, and diabetes significantly more frequently than the non-DIC patients did. Furthermore, multiple regression analyses revealed that sex, mural thrombus, aneurysm type, diabetes, and stent surgery are possible independent risk factors for AA-DIC patients. Fifty-two (22.1%) patients presented AA-DIC. Among these patients, 43 had non-typical DIC and 9 had typical DIC; the mortality rate of the latter was 22.2%. The mean age of the patients with typical DIC was significantly higher than of that of patients with non-typical DIC. The non-typical DIC patients also presented abnormal coagulation disorders of varying degrees. Furthermore, heparin or low-molecular-weight heparin improved the clinical symptoms and laboratory parameters in patients with AA and typical DIC. Thus, chronic DIC should be considered in patients with AA.

Keywords： aortic aneurysm     disseminated intravascular coagulation     anticoagulation therapy    

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3D fracture modelling and limit state analysis of prestressed composite concrete pipes

Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1,   Pages 165-175 doi: 10.1007/s11709-018-0484-4

Abstract: In this manuscript, we study fracture of prestressed cylindrical concrete pipes. Such concrete pipes play a major role in tunneling and underground engineering. The structure is modelled fully in 3D using three-dimensional continuum elements for the concrete structure which beam elements are employed to model the reinforcement. This allows the method to capture important phenomena compared to a pure shell model of concrete. A continuous approach to fracture is chosen when concrete is subjected to compressive loading while a combined continuous-discrete fracture method is employed in tension. The model is validated through comparisons with experimental data.

Keywords： cylindrical concrete structures     limit state analysis     3D fracture modelling     prestressed composite pipes     reinforced concrete     three-point bending test    

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Research on swimming by undulatory long dorsal fin propulsion

WANG Guangming, SHEN Lincheng, WU Yonghui

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 77-81 doi: 10.1007/s11465-007-0013-y

Abstract: The kinematics of steady forward swimming of is described. The geometric features of the body and locomotive characteristic and parameters of the flexible dorsal fin are discussed. On the basis of observation and experimental data, a simplified kinematic model on locomotion of the undulatory long dorsal fin propulsion is promoted. The hydromechanical performances of the undulatory long dorsal fin propeller of are estimated with the large-amplitude elongated-body theory. The hydromechanical efficiency of the undulatory long dorsal fin system ranged from 81.664% to 86.420% over a speed range of 0.728 0.985 length " s. It is suggested that the undulatory long dorsal fin propulsion is an adaptation to swimming with high hydromechanical efficiency.

Keywords： locomotive characteristic     hydromechanical     observation     propulsion     hydromechanical efficiency    

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Exploring solutions for sustainable agriculture with “green” and “development” tags in Africa

DAKORA, Jianbo SHEN, Fusuo ZHANG, Xiaoqiang JIAO

Frontiers of Agricultural Science and Engineering 2020, Volume 7, Issue 4,   Pages 363-365 doi: 10.15302/J-FASE-2020356

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Study on removing selenate from groundwater by autohydrogenotrophic microorganisms

Siqing XIA, Shuang SHEN, Jun LIANG, Xiaoyin XU

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 4,   Pages 552-558 doi: 10.1007/s11783-013-0531-2

Abstract: Performance of autohydrogenotrophic bacteria for bio-reduction of selenate (Se(VI)) under anaerobic conditions was investigated with batch experiments. Results showed Se(VI) was bio-reduced to selenite (Se(IV)) as an intermediate product, and then to elemental selenium (Se ). Reduction kinetics could be described by the pseudo-first-order model. In particular, the influences of pH value and temperature on Se(VI) reduction by autohydrogentrophic organisms were examined. The high degradation rate was achieved at pH 7.0 to 8.0; and the best reduction temperature was between 25°C and 35°C. This study is of help for treating groundwater with selenium contamination by autohydrogenotrophic bacteria as well as its reactor development.

Keywords： autohydrogenotrophic     selenate     hydrogen     groundwater    

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Removal of elemental mercury by KI-impregnated clay

Boxiong SHEN,Jianhong CHEN,Ji CAI

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 2,   Pages 236-243 doi: 10.1007/s11783-014-0765-7

Abstract: This study described the use of clay impregnated by KI in gas phase elemental mercury (Hg ) removal in flue gas. The effects of KI loading, temperature, O , SO and H O on Hg removal were investigated using a fixed bed reactor. The Hg removal efficiency of KI-clay with 3% KI loading could maintain at a high level (approximately 80 %) after 3 h. The KI-clay demonstrated to be a potential adsorbent for Hg removal when compared with activated carbon based adsorbent. O was found to be an important factor in improving the Hg removal. O was demonstrated to assist the transfer of KI to I on the surface of KI-clay, which could react with Hg directly. NO and SO could slightly improve Hg removal, while H O inhibited it greatly. The results indicated that after adsorption, most of the mercury escaped from the surface again. Some of the mercury may have been oxidized as it left the surface. The results demonstrated that the chemical reaction primarily occurred between KI and mercury on the surface of the KI-clay.

Keywords： clay     elemental mercury     removal efficiency     potassium iodide     mechanism    

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Title Author Date Type Operation

Tsien and His Work on Mechanics①

Tan Qingming

Journal Article

Intra-abdominal hypertension is an independent cause of acute renal failure after orthotopic liver transplantation

SHU Ming, PENG Chenghong, CHEN Hao, SHEN Boyong, ZHOU Guangwen, SHEN Chuan, LI Hongwei

Journal Article

New Trends in Intelligent Manufacturing

Liang Gao, Weiming Shen, Xinyu Li

Journal Article

Managing stakeholder dynamics and complexity in mega infrastructure projects

Geoffrey Qiping SHEN, Jin XUE

Journal Article

Comparative study of oscillating flow characteristics of cryocooler regenerator at low temperatures

Yonglin JU , Qingqing SHEN ,

Journal Article

Fuzzy cascade control based on control’s history for superheated temperature

WANG Guangjun, LI Gang, SHEN Shuguang

Journal Article

Current techniques for assessing developmental neurotoxicity of pesticides

GAO Yu, TIAN Ying, SHEN Xiaoming

Journal Article

Effect of fine solid particles on absorption rate of gaseous CO

LU Sumin, MA Youguang, SHEN Shuhua, ZHU Chunying

Journal Article

Effect of concrete creep and shrinkage on tall hybrid-structures and its countermeasures

Pusheng SHEN, Hui FANG, Xinhong XIA

Journal Article

Aortic aneurysm and chronic disseminated intravascular coagulation: a retrospective study of 235 patients

Yun Zhang,Chen Li,Min Shen,Bao Liu,Xuejun Zeng,Ti Shen

Journal Article

3D fracture modelling and limit state analysis of prestressed composite concrete pipes

Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN

Journal Article

Research on swimming by undulatory long dorsal fin propulsion

WANG Guangming, SHEN Lincheng, WU Yonghui

Journal Article

Exploring solutions for sustainable agriculture with “green” and “development” tags in Africa

DAKORA, Jianbo SHEN, Fusuo ZHANG, Xiaoqiang JIAO

Journal Article

Study on removing selenate from groundwater by autohydrogenotrophic microorganisms

Siqing XIA, Shuang SHEN, Jun LIANG, Xiaoyin XU

Journal Article

Removal of elemental mercury by KI-impregnated clay

Boxiong SHEN,Jianhong CHEN,Ji CAI

Journal Article