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Stability analysis of an unsaturated soil slope considering rainfall infiltration based on the Green-Ampt model

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Journal of Mountain Science 2020年第10期17卷 2577-2590页

作者： liu Zi-zhen YAN zhi-xin qiu Zhan-hong WANG Xiao-gang li Ji-wei School of Civil Engineering and Architecture Taizhou UniversityTaizhou318000China School of Civil Engineering and Mechanics Lanzhou UniversityLanzhou730000China School of Civil and Traffic Engineering Henan University of Urban ConstructionPingdingshan467000China

Based on the principle of saturated infiltration and the Green-Ampt model,an unsaturated infiltration model for a soil slope surface was established for either constant moisture content,or depth-varying moisture content and the *** parameters in the partially saturated slope were revealed under sustained *** analysis of the variation of initial moisture content in the slope,the ponding time,infiltration depth,and infiltration rate were deduced for an unsaturated soil slope subject to rainfall *** is no ponded water on the surface of the slope under sustained low-intensity *** results show that the infiltration parameters of an unsaturated slope are influenced by the initial moisture content and the wetting front saturation,the soil cohesion and rainfall intensity under sustained *** short-term slope failures can occur with the decrease of cohesion of the soil of the *** ponding time and infiltration depth differ considering constant or different initial moisture content respectively in the soil ***,best-fit curves of the infiltration rate,ponding time,and infiltration depth to the wetting front saturation were obtained with constant or different initial moisture *** the slope failure time is roughly uniform when subject to a rainfall intensity I>5 mm/h.

关键词： Rainfall infiltration Unsaturated infiltration model Wetting front saturation Slope safety factor

Small bowel diverticulum with enterolith causing intestinal obstruction: A case report

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World Journal of Gastrointestinal Surgery 2023年第6期15卷 1256-1261页

作者： li-Wen Wang Peng Chen jiang liu zhi-wei jiang xin-xin liu Department of General Surgery Jiangsu Province Hospital of Chinese MedicineAffiliated Hospital of Nanjing University of Chinese MedicineNanjing 210000Jiangsu ProvinceChina

BACKGROUND Small bowel diverticula are rare in clinics,and small intestinal obstruction caused by coprolites is rarer and difficult to diagnose *** true incidence of these diverticula may be underestimated due to their clinical symptoms not differing from those of small bowel obstruction resulting from other *** is common in the elderly,although it can occur at any *** SUMMARY This is a case report of a 78-year-old man with epigastric pain for 5 *** treatment does not effectively relieve pain,inflammatory indicators are elevated,and computed tomography suggests jejunal intussusception and mild ischemic changes in the intestinal *** exploration showed that the left upper abdominal loop was slightly edematous,the jejunum mass at the near Flex ligament was palpable,the size was about 7 cm×8 cm,the local movement was slight,and the diverticulum was seen 10 cm downward,and the local small intestine was dilated and *** was *** the short parenteral nutrition after surgery,the fluid and enteral nutrition solution were pumped through the jejunostomy tube,and the patient was discharged after the treatment was stable,and the jejunostomy tube was removed in an outpatient clinic one month after the *** pathology:Jejunectomy specimen:(1)Small intestinal diverticulum with chronic inflammation,ulcer with full-thickness activity,and necrosis of the intestinal wall in some areas;(2)also see that the hard object is consistent with stone changes;and(3)the incision margin on both sides shows chronic inflammation of mucosal *** Clinically,the diagnosis of small bowel diverticulum is difficult to distinguish from jejunal *** with the patient’s condition,rule out other possibilities after a timely disease *** to the patient’s body tolerance adopt personalized surgical methods to achieve better recovery after surgery.

关键词： Small bowel diverticulum Surgery Complications Case report

Numerical study of inhibition mechanism of high-pressure hydrogen leakage self-ignition with the addition of ammonia

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Petroleum Science 2023年第5期20卷 3184-3193页

作者： lin Teng Xi-Gui li zhi-wei Shan wei-Dong li xin Huang Peng-Bo Yin Yong-Zhen liu jiang Bian Yu Luo li-Long jiang National Engineering Research Center of Chemical Fertilizer Catalyst(NERC-CFC) College of Chemical EngineeringFuzhou UniversityFuzhou350000FujianChina Qingyuan Innovation Laboratory(QYIL Fujian Innovation Laboratory of Chemical Engineering)Quanzhou362000FujianChina cEngineering China University of Petroleum(East China)Qingdao266580ShandongChina State Key Laboratory of Automobile Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing100084China

Hydrogen and ammonia have attracted increasing attention as carbon-free *** is considered to be an effective energy storage and hydrogen storage ***,a small amount of unremoved NH3 is still present in the product during the decomposition of ammonia to produce ***,it is very essential to investigate the self-ignition of hydrogen-ammonia mixtures in order to accommodate the various scenarios of hydrogen energy *** this paper,the effect of NH3 addition on the self-ignition of high-pressure hydrogen release is numerically *** RNG k-εturbulence model,EDC combustion model,and 213-step detailed NH_(3)/H_(2) combustion mechanism are ***-Pro programs for zero-dimensional homogeneous and constant volume adiabatic reactor models are used for sensitivity analysis and ignition delay time of the chemical reaction *** results showed that the minimum burst pressure required for self-ignition increased significantly after the addition of *** maximum temperature and shock wave intensity inside the tube decreases with increasing ammonia *** ignition delay time and H,HO2,and OH radicals reduce with increasing ammonia concentration.H and HO2 radicals are suggested as indicators for tracking the second and third flame branches,respectively.

关键词： Ammonia-hydrogen energy Self-ignition Shock waves Diffusion ignition Computational fluid dynamics

Assimilation of temporal-spatial leaf area index into the CERES-Wheat model with ensemble Kalman filter and uncertainty assessment for improving winter wheat yield estimation

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Journal of Integrative Agriculture 2017年第10期16卷 2283-2299页

作者： li He jiang zhi-wei CHEN Zhong-xin REN Jian-qiang liu Bin Hasituya Key Laboratory of Agricultural Remote Sensing Ministry of Agriculture/Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural Sciences National Meteorological Information Center China Meteorological Administration

To accurately estimate winter wheat yields and analyze the uncertainty in crop model data assimilations, winter wheat yield estimates were obtained by assimilating measured or remotely sensed leaf area index （LAI） values. The performances of the calibrated crop environment resource synthesis for wheat （CERES-Wheat） model for two different assimilation scenarios were compared by employing ensemble Kalman filter （EnKF）-based strategies. The uncertainty factors of the crop model data assimilation was analyzed by considering the observation errors, assimilation stages and temporal-spatial scales. Overalll the results indicated a better yield estimate performance when the EnKF-based strategy was used to comprehen- sively consider several factors in the initial conditions and observations. When using this strategy, an adjusted coefficients of determination （R2） of 0.84, a root mean square error （RMSE） of 323 kg ha-1, and a relative errors （RE） of 4.15% were obtained at the field plot scale and an R2 of 0.81, an RMSE of 362 kg ha-1, and an RE of 4.52% were obtained at the pixel scale of 30 mx30 m. With increasing observation errors, the accuracy of the yield estimates obviously decreased, but an acceptable estimate was observed when the observation errors were within 20%. Winter wheat yield estimates could be improved significantly by assimilating observations from the middle to the end of the crop growing seasons. With decreasing assimilation frequency and pixel resolution, the accuracy of the crop yield estimates decreased; however, the computation time decreased. It is important to consider reasonable temporal-spatial scales and assimilation stages to obtain tradeoffs between accuracy and computation time, especially in operational systems used for regional crop yield estimates.

关键词： winter wheat yield estimates crop model data assimilation ensemble Kalman filter uncertainty leaf area index

Two new triterpenoid saponins from notoginseng medicinal fungal substance

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Chinese Chemical Letters 2015年第10期26卷 1298-1302页

作者： wei Xu Cai-Feng Ding xin-Wen Wang Xiao-li liu zhi-Dong qiu College of Pharmacy Changchun University of Chinese Medicine

Two new triterpenoid saponins, named ginsenoside Rh10（1） and notoginsenoside ST-6（2）, were isolated from notoginseng medicinal fungal substance. Their structures were elucidated by a combination of 1D and 2D NMR, ... 详细信息

关键词： Notoginseng Triterpenoid ginsenoside Ginsenoside Rh_(10) Notoginsenoside ST-6

New flexible CsPbBr_(3)-based scintillator for X-ray tomography

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Nuclear Science and Techniques 2022年第8期33卷 34-44页

作者： zhi-wei Lü Gong-Xiang wei Han-qiu Wang Yu Guan Ning jiang Yun-Yan liu Zhao li Hua Qin Hui-Qiang liu School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China

The evolution of lead halide perovskites used for X-ray imaging scintillators has been facilitated by the development of solution-processable semiconductors characterized by large-area,flexible,fast *** stability and durability of these new perovskites are insufficient to achieve extended computed tomography scanning times with hard *** this study,we fabricated a self-assembled CsPbBr_(3)-based scintillator film with a flexible large-area uniform thickness using a new roomtemperature solution-processable *** sensitivity and responsivity of X-ray photon conversion were quantitatively measured and showed a good linear response relationship suitable for X-ray *** also demonstrated,for the first time,that the self-assembled CsPbBr_(3)-based scintillator has good stability for hard X-ray ***,such an inexpensive solution-processed semiconductor easily prepared at room temperature can be used as a hard X-ray scintillator and equipped with flexible CsPbBr3-based X-ray *** has great potential in three-dimensional high-resolution phase-contrast X-ray-imaging applications in biomedicine and material science because of its heavy Pb and Br atoms.

关键词： X-ray scintillator X-ray illumination Computed tomography CsPbBr_(3)-based film perovskite Solution-processable semiconductor

Seroprevalence and evolutionary dynamics of genotype 4 hepatitis E virus in Shandong Province,China

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World Journal of Gastroenterology 2014年第24期20卷 7955-7963页

作者： Dong Yang Mei jiang Min Jin zhi-Gang qiu zhi-Qiang Shen wei-Hong Cui da-Ning Wang lian-Feng Gong Bo li xin-wei Wang Jun-Wen li Department of Environment and Health Tianjin Institute of Health and Environmental Medicine Key Laboratory of Risk Assessment and Control for Environment and Food Safety Yantai Center for Disease Control and Prevention

AIM: To investigate the seroprevalence and evolutionary dynamics of hepatitis E virus (HEV) and assess the ancestor of HEVs in China’s Shandong Province.

关键词： Hepatitis E virus Zoonotic Cross-species transmission Trans-regional transmission Evolutionary dynamics

Avoidance of urinary drainage during perioperative period of open elective colonic resection within enhanced recovery after surgery programme

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Gastroenterology Report 2021年第6期9卷 589-594页

作者： Yun li zhi-wei jiang xin-xin liu Hua-Feng Pan Guan-Wen Gong Cheng Zhang Zheng-Rong li Department of Gastrointestinal Surgery The First Affiliated Hospital of Nanchang UniversityNanchangJiangxiP.R.China jiangxi Institute of Digestive surgery NanchangJiangxi 330006P.R.China Department of General Surgery The Affiliated Hospital of Nanjing University of Chinese MedicineNanjingJiangsuP.R.China

Background:Urinary catheterization(UC)is a conventional perioperative measure for major abdominal *** of perioperative catheter management is an essential component of the enhanced recovery after surgery(ERAS)*** aimed to investigate the risk factors of urinary retention(UR)after open colonic resection within the ERAS protocol and to assess the feasibility of avoiding urinary drainage during the perioperative ***:A total of 110 colonic-cancer patients undergoing open elective colonic resection between July 2014 and May 2018 were enrolled in this *** patients were treated within our ERAS protocol during the perioperative *** on patients’demographics,clinicopathologic characteristics,and perioperative outcomes were collected and analysed ***:Sixty-eight patients(61.8%)underwent surgery without any perioperative *** patients(27.3%)received indwelling UC during the surgical ***(10.9%)cases developed UR after surgery necessitating *** patients with intraoperative UC had a lower incidence of post-operative UR[0%(0/30)vs 15%(12/80),P=0.034],intraoperative UC was not testified as an independent protective factor inmultivariate logistic *** history of prostatic diseases and the body mass index were strongly associated with post-operative *** patients were diagnosed with post-operative urinary-tract infection,among whom two had intraoperative UC and four were complicated with post-operative UR requiring ***:Avoidance of urinary drainage for open elective colonic resection is feasible with the implementation of the ERAS programme as the required *** and a history of prostatic diseases are significant predictors of postoperative UR.

关键词： colectomy urinary catheterization urinary retention enhanced recovery after surgery

Full robot-assisted gastrectomy with intracorporeal robot-sewn anastomosis produces satisfying outcomes

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World Journal of Gastroenterology 2013年第38期19卷 6427-6437页

作者： xin-xin liu zhi-wei jiang Ping Chen Yan Zhao Hua-Feng Pan Jie-Shou li Department of Gastrointestinal Surgery Subei People’s Hospital of Jiangsu Province Post-doctoral Mobile Stations of Nanjing University Clinical Medical College of Yangzhou University Department of General Surgery Jinling HospitalSchool of MedicineNanjing University

AIM:To evaluate the feasibility and safety of full robotassisted gastrectomy with intracorporeal robot handsewn anastomosis in the treatment of gastric ***:From September 2011 to March 2013,110consecutive patients with gastric cancer at the authors’institution were enrolled for robotic *** to tumor location,total gastrectomy,distal or proximal subtotal gastrectomy with D2 lymphadenectomy was fully performed by the da Vinci Robotic Surgical *** construction,including Roux-en-Y jejunal limb,esophagojejunal,gastroduodenal and gastrojejunal anastomoses were fully carried out by the intracorporeal robot-sewn *** the end of surgery,the specimen was removed through a 3-4 cm incision at the umbilicus trocar *** details of the surgical technique are well *** benefits in terms of surgical and oncologic outcomes are well documented,as well as the failure rate and postoperative ***:From a total of 110 enrolled patients,radical gastrectomy could not be performed in 2 patients due to late stage disease;1 patient was converted to laparotomy because of uncontrollable hemorrhage,and1 obese patient was converted due to difficult exposure;2 patients underwent extra-corporeal anastomosis by minilaparotomy to ensure adequate tumor ***-sewn anastomoses were successfully performed for 12 proximal,38 distal and 54 total *** average surgical time was 272.52±53.91 min and the average amount of bleeding was 80.78±32.37 *** average number of harvested lymph nodes was 23.1±*** specimens showed adequate surgical *** regard to tumor staging,26,32 and 46 patients were staged asⅠ,ⅡandⅢ,*** average hospitalization time after surgery was 6.2 *** patient experienced a duodenal stump anastomotic leak,which was mild and treated *** patient was readmitted for intra-abdominal infection and was treated *** afferent loop obstruction occurred i

关键词： Robotic surgery Gastric cancer Total gastrectomy Esophagojejunal anastomosis