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| 1 | Multi-detector CT enterography with iso-osmotic mannitol as oral contrast for detecting small bowel disease显示文摘AIM: To assess the feasibility and usefulness of multi-detector CT enterography with orally administered iso-osmotic mannitol as negative contrast in demonstrating small bowel disease.METHODS: Thirteen volunteers and 38 patients with various kinds of small bowel disease were examined. We administered about 1 500 mL iso-osmotic mannitol as negative contrast agent and then proceeded with helical CT scanning on a Siemens Sensation 16 scanner. All volunteers and patients were interviewed about their tolerance of the procedure. Two radiologists postprocessed imaging data with MPR, thin MIP, VRT and INSPACE when necessary and then interpreted the scans,and adequacy of luminal distention was evaluated on a four-point scale. Demonstration of features of various kinds of small bowel disease was analyzed.RESULTS: The taste of iso-osmotic mannitol is good (slightly sweet) and acceptable by all. Small bowel distention was excellent and moderate in most volunteers and patients. CT features of many kinds of diseases such as tumors, Crohn's disease,and small bowel obstruction,etc. were clearly displayed.CONCLUSION: Multi-detector CT enterography with iso-osmotic mannitol as negative contrast to distend the small bowel is a simple, rapid, noninvasive and effective method of evaluating small bowel disease. | Lian-HeZhang Shi-ZhengZhang Hong-JieHu MinGao MingZhang QianCao Qiao-weiZhang | 2005 | World Journal of Gastroenterology2005，11，15： | 9 |
| 2 | Expression of growth hormone and its receptor in chronic atrophic gastritis and its clinical significance显示文摘AIM: To investigate the growth hormone (GH) and growthhormone receptor (GHR) expression of and its clinicalsignificance in patients with chronic atrophic gastritis (CAG).METHODS: A total of 90 cases were enrolled in the study.Thirty were healthy controls, the other 60 patients weredivided into two groups according to the endoscopical andhistological diagnosis. Blood samples were drawn in themorning (menarche did not occur during the bloodextraction in female patients), gastric mucosa was obtainedby endoscopy. Serum GH and gastrice mucosal GHR levelswere measured using radioimmunoassay (RIA) and EnVinsion technique.RESULTS: The average GH level was 1.021*0.132 pg/L inCAG patients, in controls it was 2.869+_0.512 )~g/L. Therewas a significant difference between these two groups(P<0.01). The positive rate of GHR in CAG patients was10%, in controls the rate was 100%. There was asignificant difference (P<0.01). There was no significantchange of GH level (3.176+0.421 ~tg/L) in patients withgastric carcinoma compared with controls (P>0.05).CONCLUSION: The study shows that levels of GH andGHR expression are low in CAG patients. CAG pathogenesishas a correlation with mucosal nutrient deficiency,decreased levels of GH and GHR have an adverse effect onthe repair and regeneration of CAG. There is no significantchange of GH in gastric carcinorma patients, GH dose notplay a role in the pathogenesis of gastric cancer. | Jian-MinSi QianCao MinGao | 2004 | World Journal of Gastroenterology2004，10，19： | 7 |
| 3 | Event-triggered neural network control of autonomous surface vehicles over wireless network显示文摘In this paper, an event-triggered neural network control method is proposed for autonomous surface vehicles subject to uncertainties and input constraints over wireless network. An event-triggered mechanism with three logic rules is employed to determine the wireless data transmission of states and control inputs. An event-driven neural network is applied to approximate the uncertainties using aperiodic sampled states. In addition, a predictor is employed to update the weights of neural network. An event-based bounded kinetic control law is applied to address the actuator constraints. The advantage of the proposed event-triggered neural network control approach is that the network traffic can be reduced while guaranteeing system stability and speed following performance. The closed-loop control system is proved to be input-tostate stable via cascade theory. The Zeno behavior can be avoided via the proposed event-triggered neural network control approach. A simulation example is provided to demonstrate the effectiveness of the proposed event-triggered neural network control approach for autonomous surface vehicles. | Mingao LV Dan WANG Zhouhua PENG Lu LIU Haoliang WANG | 2020 | Science China(Information Sciences)2020，63，5： | 3 |
| 4 | Conformal vector fields on some Finsler manifolds显示文摘We study conformal vector fields on a Finsler manifold whose metric is defined by a Riemannian metric, a 1-form and its norm. We find PDEs characterizing conformal vector fields. Then we obtain the explicit expressions of conformal vector fields for certain spherically symmetric metrics on R^n. | SHEN ZhongMin YUAN MinGao | 2016 | Science China Mathematics2016，59，1： | 3 |
| 5 | Research on deformation mechanism of AZ31 magnesium alloy sheet with non-basal texture during uniaxial tension at room temperature:A visco-plastic self-consistent analysis显示文摘The relationship between activities of involved deformation mechanisms and the evolution of microstructure and texture during uniaxial tension of AZ31 magnesium alloy with a rare non-basal texture has been thoroughly investigated in the present study by means of electron backscattered diffraction(EBSD) measurement and visco-plastic self-consistent(VPSC) modeling. These results show that except basal slip and prismatic slip, {10■2} extension twin(ET) also plays a significant role during plastic deformation. With the increasing tilted angle between loading direction and rolling direction(RD) of sheet, the activity of {10■2} ET possesses a decreasing tendency and its role in plastic deformation changes from the one mainly sustaining plastic strain to the one mainly accommodating local strain between individual grains. When {10■2} ET serves as a carrier of plastic strain, it mainly results in the formation of basal texture component(c-axis//ND, normal direction). By comparison, when the role of {10■2} ET is to accommodate local strain, it mainly brings about the formation of prismatic texture component(c-axis//TD, transverse direction). At large plastic deformation, the competition between basal slip and pyramidal slip is responsible for the concentration of tilted basal poles towards ND within all deformed samples. The larger difference is between the activities of basal slip and pyramidal slip, the smaller separation is between these two tilted basal poles. Besides,VPSC modeling overesttmates volume fractions of {10■2} ET in samples with angle of 0 to 30° between loading direction and RD of sheet because interactions between twin variants are not included in VPSC modeling procedure at the present form. In addition, as compatible deformation between individual grains cannot be considered in VPSC modeling, the predicted volume fractions of {10■2} ET in samples with angle of 45 to 90° between loading direction and RD of sheet are smaller than the correspondingly measured results. | Li Hu Huyuan Lv Laixin Shi Yu Chen Qiang Chen Tao Zhou Mingao Li Mingbo Yang | 2022 | Journal of Magnesium and Alloys2022，10，7： | 2 |
| 6 | The influence of a thick hard rock stratum on underground mining subsidence显示文摘 | Lixin Wu Mingao Qian Jinzhuang Wang | 1997 | International Journal of Rock Mechanics and Mining Sciences1997，，2： | 1 |
| 7 | Dependence of Microstructure Evolution and Mechanical Properties on Loading Direction for AZ31 Magnesium Alloy Sheet with Non-basal Texture During In-Plane Uniaxial Tension显示文摘In-plane uniaxial tension of AZ31 magnesium alloy sheet with non-basal texture has been conducted in order to demonstrate the effects of loading direction on the microstructure evolution and mechanical properties at ambient temperature.Loading axes are chosen to be along five directions distributed between rolling direction(RD)and transverse direction(TD),allowing various activities in involved slip and twinning modes to take place.As for twinning modes,electron backscattered diffraction observations confirm that the contribution of{1011}compression twinning is minimal to the plastic deformation of all deformed samples.By comparison,{1012}extension twinning(ET)not only serves as an important carrier on sustaining and accommodating plastic strain but also contributes to the emergence of TD-component texture with the progression of plastic strain.In terms of slip modes,analysis on Schmid factor demonstrates that the increasing tilted angle between loading direction and RD of sheet is unfavorable to the activation of basalslip,whereas it contributes to the activation of prismaticslip.These observations consequently explain the increasing tendency of 0.2%proof yield stress.Moreover,the activations of basalslip and{1012}ET collectively contribute to the concentration of two tilted basal poles toward normal direction.With increasing angle between loading direction and RD,the activations of basalslip and{1012}ET are gradually weakened.This leads to a weakening tendency about concentration of two tilted basal poles,a generally increasing tendency about Lankford value(r-value)and a generally decreasing tendency about strain-hardening exponent(n-value). | Li Hu Mingao Li Qiang Chen Tao Zhou Laixin Shi Mingbo Yang | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，2： | 0 |
| 8 | Data-Driven Learning Extended State Observers for Nonlinear Systems:Design,Analysis and Hardware-in-Loop Simulations显示文摘Dear Editor, This paper considers the disturbance/uncertainty estimation of first-order nonlinear system subject to fully unknown internal dynamic, external disturbance, and unknown control input gain.Compared with existing extended state observer(ESO) where priori knowledge of model parameter such as nominal input gain should be known as a priori. | Zhouhua Peng Mingao Lv Lu Liu Dan Wang | 2023 | IEEE/CAA Journal of Automatica Sinica2023，10，1： | 0 |
| 9 | Correction to:Dependence of Microstructure Evolution and Mechanical Properties on Loading Direction for AZ31 Magnesium Alloy Sheet with Non‑basal Texture During In‑Plane Uniaxial Tension显示文摘In the originally published PDF version of the article,a reference citation[34]has been omitted in the caption of Fig.6.The added reference No.34 is“L.Hu,H.Lv,L.Shi,Y.Chen,Q.Chen,T.Zhou,M.Li,M.Yang,J.Magnes.Alloy.10,1994(2022)http://gffzzd3cc09b8251d45dfsb5kn6uuqkqcw6v9q.ffgz.tsg.suse.edu.cn/10.1016/j.jma.2020.12.008.” | Li Hu Mingao Li Qiang Chen Tao Zhou Laixin Shi Mingbo Yang | 2024 | Acta Metallurgica Sinica(English Letters)2024，37，2： | 0 |
| 10 | Influence of bimodal non-basal texture on microstructure characteristics,texture evolution and deformation mechanisms of AZ31 magnesium alloy sheet rolled at liquid-nitrogen temperature显示文摘Cryogenic rolling experiments have been conducted on the AZ31 magnesium(Mg)alloy sheet with bimodal non-basal texture,which is fabricated via the newly developed equal channel angular rolling and continuous bending process with subsequent annealing(ECAR-CB-A)process.Results demonstrate that this sheet shows no edge cracks until the accumulated thickness reduction reaches about 18.5%,which is about 105.6%larger than that of the sheet with traditional basal texture.Characterization experiments including optical microstructure(OM),X-ray diffractometer(XRD),and electron backscatter diffraction(EBSD)measurements are then performed to explore the microstructure characteristics,texture evolution and deformation mechanisms during cryogenic rolling.Experimental observations confirm the occurrence of abundant{10–12}extension twins(ETs),twin-twin interactions among{10–12}ET variants and{10–12}-{10–12}double twins(DTs).The twinning behaviors as for{10–12}ETs are responsible for the concentration of c-axes of grains towards normal direction(ND)and the formation of transverse direction(TD)-component texture at the beginning of cryogenic rolling.The twinning behaviors with respect to{10–12}-{10–12}DTs are responsible for the disappearance of TD-component texture at the later stage of cryogenic rolling.The involved deformation mechanisms can be summarized as follows:Firstly{10–12}ETs dominate the plastic deformation.Subsequently,dislocation slip,especially basalslip,starts to sustain more plastic strain,while{10–12}ETs occur more frequently and enlarge continuously,resulting in the formation of twin-twin interaction among{10–12}ET variants.With the increasing rolling passes,{10–12}-{10–12}DTs incorporate in the plastic deformation and dislocation slip serves as the major one to sustain plastic strain.The activities of basalslip,{10–12}ETs and{10–12}-{10–12}DTs benefit in accommodating the plastic strain in sheet thickness,which contributes to the improved rolling formability in AZ31 Mg alloy sheet with bimodal non-basal texture during cryogenic rolling. | Shouzuo Zhang Li Hu Yutao Ruan Tao Zhou Qiang Chen Yang Zhong Laixin Shi Mingao Li Mingbo Yang Shuyong Jiang | 2023 | Journal of Magnesium and Alloys2023，11，7： | 0 |
| 11 | Over 18% binary organic solar cells enabled by isomerization of non-fullerene acceptors with alkylthiophene side chains显示文摘Side-chain engineering has been demonstrated as an effective method for fine-tuning the optical,electrical,and morphological properties of organic semiconductors toward efficient organic solar cells(OSCs).In this work,three isomeric non-fullerene small molecule acceptors(SMAs),named as BTP-4F-T2C8,BTP-4F-T2EH and BTP-4F-T3EH,with linear and branched alkyl chains substituted on the α or β positions of thiophene as the side chains,were synthesized and systematically investigated.The results demonstrate that the size and substitution position of alkyl side chains can greatly affect the electronic properties,molecular packing as well as crystallinity of the SMAs.After blending with donor polymer D18-Cl,the prominent device performance of 18.25% was achieved by the BTP-4F-T3EH-based solar cells,which is higher than those of the BTP-4F-T2EH-based(17.41%)and BTP-4F-T2C8-based(15.92%)ones.The enhanced performance of the BTP-4F-T3EH-based devices is attributed to its stronger crystallinity,higher electron mobility,suppressed bimolecular recombination,and the appropriate intermolecular interaction with the donor polymer.This work reveals that the side chain isomerization strategy can be a practical way in tuning the molecular packing and blend morphology for improving the performance of organic solar cells. | Ao Shang Siwei Luo Jianquan Zhang Heng Zhao Xinxin Xia Mingao Pan Chao Li Yuzhong Chen Jicheng Yi Xinhui Lu Wei Ma He Yan Huawei Hu | 2022 | Science China Chemistry2022，65，9： | 0 |
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