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EFFECT OF SUSPENDED SOLID PARTICLES ON UNSTABILITY OF TWO-DIMENSION MIXING LAYER
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作者 周泽宣 林建忠 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1997年第6期543-549,共7页
By considering the effect of suspended solid particles in the ordinary equations for two-dimension inviscid incompressible mixing layer, the Rayleigh equation and the modified Rayleigh equation are obtained. And then,... By considering the effect of suspended solid particles in the ordinary equations for two-dimension inviscid incompressible mixing layer, the Rayleigh equation and the modified Rayleigh equation are obtained. And then, by solving the corresponding eigen-value equations with numerical computational method, the relation curves between perturbation frequency and spacial growth rate of the mixing layer for the varying particle loading, ratio of particle velocity to fluid velocity and Stokes number are got. Sever al important conclusions on the effect of suspended solid particles on unstability of the mixing layer are presented in the end by analyzing all the relation curves. 展开更多
关键词 two-dimension mixing layer unstability suspended solid particles numerical computation
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The unstability of cytoplasmic male sterility of Brassica napus L.
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作者 宋文光 管荣展 任乐见 《华北农学报》 CSCD 北大核心 1993年第S2期40-44,共5页
The unstability of cytoplasmic male sterilities (CMS) of Brassica napus Lwas stud-ied from 1989 to 1992,and the results indicated: 1. The occurrence of trace-pollen plants In sterilematerials was caused by nuclear pol... The unstability of cytoplasmic male sterilities (CMS) of Brassica napus Lwas stud-ied from 1989 to 1992,and the results indicated: 1. The occurrence of trace-pollen plants In sterilematerials was caused by nuclear polygenes of the maintainers; 2. Progenies of partial sterility typeshowed segregation of sterile, partially sterile (with trace pollen )and fertile plants; 3. High andlow temperature CMS lines were crossed and its progenies manifested complex segregation; 4.There was a tendency to increase the fertility with successive selfing of the high temperatureCMS line. 展开更多
关键词 BRASSICA NAPUS L. CYTOPLASMIC male STERILITY UNSTABLE STERILITY partial STERILITY type
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Unstable evolution of railway slope under the rainfall-vibration joint action
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作者 DONG Haoyu WANG Jiading +2 位作者 ZHANG Dengfei LI Lin XU Yuanjun 《Journal of Mountain Science》 SCIE CSCD 2024年第4期1419-1431,共13页
Understanding the unstable evolution of railway slopes is the premise for preventing slope failure and ensuring the safe operation of trains.However,as two major factors affecting the stability of railway slopes,few s... Understanding the unstable evolution of railway slopes is the premise for preventing slope failure and ensuring the safe operation of trains.However,as two major factors affecting the stability of railway slopes,few scholars have explored the unstable evolution of railway slopes under the joint action of rainfall-vibration.Based on the model test of sandy soil slope,the unstable evolution process of slope under locomotive vibration,rainfall,and rainfall-vibration joint action conditions was simulated in this paper.By comparing and analyzing the variation trends of soil pressure and water content of slope under these conditions,the change laws of pore pressure under the influence of vibration and rainfall were explored.The main control factors affecting the stability of slope structure under the joint action conditions were further defined.Combined with the slope failure phenomena under these three conditions,the causes of slope instability resulting from each leading factor were clarified.Finally,according to the above conclusions,the unstable evolution of the slope under the rainfall-vibration joint action was determined.The test results show that the unstable evolution process of sandy soil slope,under the rainfall-vibration joint action,can be divided into:rainfall erosion cracking,vibration promotion penetrating,and slope instability sliding three stages.In the process of slope unstable evolution,rainfall and vibration play the roles of inducing and promoting slide respectively.In addition,the deep cracks,which are the premise for the formation of the sliding surface,and the violent irregular fluctuation of soil pressure,which reflects the near penetration of the sliding surface,constitute the instability characteristics of the railway slope together.This paper reveals the unstable evolution of sandy soil slopes under the joint action of rainfall-vibration,hoping to provide the theoretical basis for the early warning and prevention technology of railway slopes. 展开更多
关键词 Rainfall vibration joint action Small scale model tests Unstable evolution process Unstable characteristics Inducing sliding and promoting sliding
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Esophageal inserted subclavian catheter:a rare complication
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作者 DilberÜçöz Kocaşaban SertaçGüler 《World Journal of Emergency Medicine》 SCIE CAS CSCD 2024年第3期243-245,共3页
Central venous catheterization(CVC) is an invasive procedure for administering fluids,nutrients,and drugs;monitoring central venous pressure;performing pulmonary artery catheterization;and placing transvenous pacemake... Central venous catheterization(CVC) is an invasive procedure for administering fluids,nutrients,and drugs;monitoring central venous pressure;performing pulmonary artery catheterization;and placing transvenous pacemakers in intensive care units and all specialties,from anesthesia to emergency medicine,for the treatment of trauma and hemodynamically unstable pediatric and adult patients.[1,2]Complications have been observed in more than 15% of patients who underwent CVC.Mechanical,infectious,and thrombotic complications have been reported in 5%–19%,5%–26%,and 2%–26% of patients,respectively.[3] Malposition,on the other hand,is common in subclavian catheter insertion and is usually associated with an initially misplaced guidewire.[4] 展开更多
关键词 UNSTABLE INSERTION initially
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Analysis and Prospects of the World Economic Situation 2023-2024
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作者 Zhang Yuyan Xu Xiujun 《Contemporary World》 2024年第1期27-31,共5页
At present,the growth momentum of the world economy is clearly insufficient,and faced with many unstable,uncertain and unpredictable factors,the world economy is generally on a downward path.From the perspective of tr... At present,the growth momentum of the world economy is clearly insufficient,and faced with many unstable,uncertain and unpredictable factors,the world economy is generally on a downward path.From the perspective of trend changes,the world economy will still be in the process of reshaping its growth momentum in 2024,with positive factors accumulating but downward pressure remaining. 展开更多
关键词 DOWNWARD UNSTABLE ECONOMY
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PFNA2 versus 95 Degree Condylar Blade Plate in the Management of Unstable Trochanteric Fractures
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作者 Piyush Gadegone Wasudeo Gadegone +1 位作者 Vijayanand Lokhande Virender Kadian 《Open Journal of Orthopedics》 2024年第2期93-104,共12页
Purpose: The proximal femoral nail anti-rotation (PFNA) is known to have advantages in enhancing the anchorage ability of internal fixation in elderly unstable osteoporotic intertrochanteric fracture patients. However... Purpose: The proximal femoral nail anti-rotation (PFNA) is known to have advantages in enhancing the anchorage ability of internal fixation in elderly unstable osteoporotic intertrochanteric fracture patients. However whether it is superior to condylar blade fixation is not clear. This study aimed to determine which treatment has better clinical outcomes in older patients. Materials and Methods: A total of 86 patients over the age of 60 with unstable trochanteric fractures within the past 3 weeks, were included in this prospective study conducted from June 1, 2018, to May 31, 2021. All the intertrochanteric fractures were classified according to AO/OTA classification. Among them, 44 cases were treated with the Proximal Femoral Nail (PFNA2) with or without an augmentation screw, and 42 cases were treated with the Condylar Blade Plate. In addition, the operative time, intraoperative blood loss, intraoperative and postoperative blood transfusion, postoperative weight-bearing time, hospitalization time, Harris score of hip function, Kyle’s criteria and postoperative complications were compared between the two groups. Results: The mean duration of surgery for the PFN group was 66.8 minutes (on average), whereas for the condylar blade plate group, it was 99.30 minutes (on average). The PFNA2 group experienced less blood loss (average of 80 mL) compared to the condylar blade plate group (average of 120 mL). Union and partial weight-bearing occurred earlier in the PFNA2 group (14.1 weeks and 10.6 weeks, respectively) compared to the Condylar blade plate group (18.7 weeks and 15.8 weeks). In two patients from the PFNA2 group, screw backing out and varus collapse complications were encountered;however, these patients remained asymptomatic and did not require revision surgery. In two other patients, screw cut out and breakage of the nail at the helical screw hole leading to non-union of the proximal femur were observed during the nine-month follow-up, necessitating revision surgery with prosthetic replacement. Among the condylar blade plate group, three patients experienced complications, including blade breakage at the blade and plate junction. In two cases, the fracture united in varus, and in one case, the blade cut through, resulting in non-union of the femoral head, which required revision surgery. According to the Harris hip score and Kyle’s criteria, a good-excellent outcome was observed in 92.85% of cases in the PFNA2 group and 90.90% of cases in the condylar blade plate group. Conclusion: Both the Proximal Femoral Nail A2 and Condylar blade plate are effective implants for the treatment of unstable trochanteric fractures. The intramedullary implant promotes biological healing and allows for early ambulation with minimal complications. Similarly satisfactory restoration of anatomy and favorable radiological and functional results can be achieved with the biological fixation provided by the 95-degree condylar blade plate. However, the use of PFNA2 internal fixation technique has the advantage of less trauma in elderly patients than the 95-degree condylar blade plate. 展开更多
关键词 Proximal Femoral Nail Anti-Rotation Condylar Blade Plate Internal Fixation Unstable Intertrochanteric Fracture OSTEOPOROTIC
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Analysis of the Nursing Effect of Continuity of Care on Elderly Patients with Coronary Heart Disease Unstable Angina and its Impact on Quality of Life
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作者 Ling Yan 《Journal of Clinical and Nursing Research》 2024年第2期185-190,共6页
Objective:To analyze the effect of using continuity of care for elderly patients with coronary heart disease(CHD)with unstable angina pectoris(UAP)and its impact on their quality of life.Methods:100 cases of elderly p... Objective:To analyze the effect of using continuity of care for elderly patients with coronary heart disease(CHD)with unstable angina pectoris(UAP)and its impact on their quality of life.Methods:100 cases of elderly patients with CHD with UAP admitted to our hospital from March 2022 to March 2023 were selected and grouped into an observation group and a control group of 50 cases each according to the randomized number table method.The nursing effect and quality of life of the observation group(continuity nursing)and the control group(routine nursing)were compared.Results:The total effective rate of nursing care was 96.00%observation group and 80.00%for the control group,and the differences were significant(χ2=6.061,P<0.05).Patients in the observation group had fewer episodes(1.42±0.21)times/week and a shorter duration(5.46±0.39)min,which were better than the control group(t=3.465,2.973;P<0.05).The depression self-rating depression scale(SDS)score(42.16±6.64)and anxiety self-rating scale(SAS)score(32.26±7.35)in the observation group were lower and the quality of life was higher as compared to that of the control group(P<0.05).Conclusion:Continuous nursing care improved the nursing effect of elderly CHD with UAP patients,promoted the alleviation of UAP symptoms,improved patient mentality,and improved their quality of life.Hence,continuous nursing care possesses significant clinical application value. 展开更多
关键词 Continuity of care ELDERLY Coronary heart disease Unstable angina Nursing outcomes Quality of life
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Rapid correction of hyperglycemia:A necessity but at what price?A brief report of a patient living with type 1 diabetes 被引量:2
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作者 Priscille Huret Philippe Lopes +3 位作者 Randa Dardari Alfred Penfornis Claire Thomas Dured Dardari 《World Journal of Diabetes》 SCIE 2023年第11期1710-1716,共7页
BACKGROUND The correction and control of chronic hyperglycemia are the management goals of patients living with diabetes.Chronic hyperglycemia is the main factor inducing diabetes-related complications.However,in cert... BACKGROUND The correction and control of chronic hyperglycemia are the management goals of patients living with diabetes.Chronic hyperglycemia is the main factor inducing diabetes-related complications.However,in certain situations,the rapid and intense correction of chronic hyperglycemia can paradoxically favor the onset of microvascular complications.CASE SUMMARY In this case report,we describe the case of a 25-year-old woman living with type 1 diabetes since the age of 9 years.Her diabetes was chronic and unstable but without complications.During an unplanned pregnancy,her diabetes was intensely managed with the rapid correction of her hyperglycemia.However,over the following 2 years,she developed numerous degenerative microvascular complications:Charcot neuroarthropathy with multiple joint involvement,severe proliferative diabetic retinopathy,gastroparesis,bladder voiding disorders,and end-stage renal failure requiring hemodialysis.CONCLUSION In the literature to date,the occurrence of multiple microvascular complications following the rapid correction of chronic hyperglycemia has been rarely described in the same individual. 展开更多
关键词 Unstable diabetes Chronic hyperglycemia Microvascular complication Type 1 diabetes Case report
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盆底磁刺激联合盆底肌训练对女性膀胱过度活跃症的疗效观察 被引量:2
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作者 李嫜洁 张莉娟 +4 位作者 朱燕华 黄惠萍 袁晓红 孙赵娜 陈鸣华 《中国康复医学杂志》 CAS CSCD 北大核心 2023年第1期101-104,共4页
膀胱过度活跃症(overactive bladder,OAB)由国际尿控协会(International Continence Society,ICS)定义为一种以“尿急”为主要症状,伴有尿频、夜尿增多,伴或不伴有急迫性尿失禁(urge urinary incontinence,UUI)的症候群^([1])。过去也... 膀胱过度活跃症(overactive bladder,OAB)由国际尿控协会(International Continence Society,ICS)定义为一种以“尿急”为主要症状,伴有尿频、夜尿增多,伴或不伴有急迫性尿失禁(urge urinary incontinence,UUI)的症候群^([1])。过去也被命名为“不稳定膀胱(unstable bladder,UB)”“逼尿肌不稳定(detrusor instability,DI)”“逼尿肌过度活动(detrusor overactive,DO)”等。随着社会人口老龄化及对高质量生活需求的增长,该症候群逐渐被临床广泛关注。研究表明,亚洲男性OAB发生率为19.5%. 展开更多
关键词 夜尿增多 不稳定膀胱 盆底肌训练 逼尿肌不稳定 急迫性尿失禁 unstable 逼尿肌过度活动
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Double-up for single-ion masses 被引量:1
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作者 Philip M.Walker 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第7期159-161,共3页
A cunning addition for the determination of nuclear masses provides world-leading sensitivity for accurate measurements.This is already opening up new physics and applications.It may sound simple to weigh an atomic nu... A cunning addition for the determination of nuclear masses provides world-leading sensitivity for accurate measurements.This is already opening up new physics and applications.It may sound simple to weigh an atomic nucleus,but there is more to it than you might think,especially when the nucleus is very unstable.Finding out the properties of such fleeting nuclei,perhaps surviving for only a few milliseconds,can solve long-standing science problems.Short-lived nuclei are key to our understanding not only of how neutrons and protons bind together in nuclei,but also of the way that explosive events in the cosmos tell us about the life cycle of stars. 展开更多
关键词 ADDITION UNSTABLE STARS
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Structural Determination,Unstable Antiferromagnetism and Transport Properties of Fe-Kagome Y_(0.5)Fe_(3)Sn_(3) Single Crystals
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作者 刘洋 吕孟 +6 位作者 刘俊艳 张伸 杨金颖 杜志伟 王彬彬 魏红祥 刘恩克 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第4期50-55,共6页
Kagome materials have been studied intensively in condensed matter physics.With rich properties,various Kagome materials emerge during this process.Here,we grew single crystals of Y_(0.5)Fe_(3)Sn_(3)and confirmed an Y... Kagome materials have been studied intensively in condensed matter physics.With rich properties,various Kagome materials emerge during this process.Here,we grew single crystals of Y_(0.5)Fe_(3)Sn_(3)and confirmed an YCo_(6)Ge_(6)-type Kagome-lattice structure by detailed crystal structure characterizations.This compound bears an antiferromagnetic ordering at T_(N)= 551 K,and shows a weak ferromagnetism at low temperatures,where an anomalous Hall effect was observed,suggesting the non-zero Berry curvature.With the unstable antiferromagnetic ground state,our systematic investigations make Y_(0.5)Fe_(3)Sn_(3)a potential Kagome compound for Kagome or topological physics. 展开更多
关键词 Crystal structure UNSTABLE
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Application of lesser trochanteric reduction fixator in the treatment of unstable intertrochanteric fractures
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作者 Yao-Min Hui Guang Zeng +1 位作者 Pei-Yi Liu Bin Chai 《World Journal of Clinical Cases》 SCIE 2023年第25期5863-5869,共7页
BACKGROUND Closed reduction and internal fixation with intramedullary nails has been widely accepted for treating intertrochanteric fractures.AIM To focus on how to avoid displacement of the lesser trochanter in unsta... BACKGROUND Closed reduction and internal fixation with intramedullary nails has been widely accepted for treating intertrochanteric fractures.AIM To focus on how to avoid displacement of the lesser trochanter in unstable intertrochanteric fractures.METHODS We developed a lesser trochanteric reduction fixator for treating intertrochanteric fractures through fixing the lesser trochanter by combining the loop plate through the fixator after reduction by the reducer.Five patients with intertrochanteric fractures treated with the newly developed lesser trochanteric reduction fixator and loop plate combined with intramedullary nails,and 20 patients with intertrochanteric fractures treated with simple intramedullary nails were selected from December 2020 to March 2021.RESULTS The postoperative Harris hip score was significantly higher in patients treated with the lesser trochanteric reduction fixator than in patients treated without the lesser trochanteric reduction fixator,which indicated that this lesser trochanteric reduction fixator had a positive impact on rehabilitation of the hip joint after surgery and could significantly improve the quality of life of patients.CONCLUSION We fully realize the significance of trochanteric reduction and fixation,namely,reconstruction of structures under pressure,in the treatment of intertrochanteric fractures.As long as the general condition of patients is favorable and they are willing to undergo surgery,fixation of the main fracture end should be performed and the lesser trochanter should be reduced and fixed at the same time. 展开更多
关键词 Lesser trochanteric Intertrochanteric fractures Reduction fixator Loop plate Unstable fractures
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Internal fixator vs external fixator in the management of unstable pelvic ring injuries:A prospective comparative cohort study
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作者 Mohamed Abo-Elsoud Mostafa I Awad +2 位作者 Mahmoud Abdel Karim Sherif Khaled Mohamed Abdelmoneim 《World Journal of Orthopedics》 2023年第7期562-571,共10页
BACKGROUND Reconstruction of the pelvic ring anatomy in unstable anterior pelvic ring injuries is a significant step to reduce the mortality rate associated with these injuries efficiently.There is a debate on using e... BACKGROUND Reconstruction of the pelvic ring anatomy in unstable anterior pelvic ring injuries is a significant step to reduce the mortality rate associated with these injuries efficiently.There is a debate on using either an anterior subcutaneous pelvis internal fixator(INFIX)or an anterior supra-acetabular external fixator(EXFIX)to manage an unstable anterior pelvic ring fracture.AIM To compare the functional and radiological outcomes and complications of INFIX vs EXFIX in managing unstable pelvic ring injuries.METHODS A prospective cohort study included 54 patients with unstable pelvic ring fractures.The patients were divided into two groups;the INFIX group,in which 30 cases were fixed by INFIX,and the EXFIX group,in which 24 patients were treated by EXFIX.The average age in the EXFIX group was 31.17 years(16-57 years),while in the INFIX group,it was 34.5 years(17-53 years).The study included 20(66.7%)males and 10(33.3%)females in the INFIX group and 10(41.7%)males and 14(58.3%)females in the EXFIX group.The radiological outcomes were evaluated using Matta and Tornetta's score,and the functional outcomes using the Majeed score.RESULTS The results revealed a statistically significant difference between both groups(P=0.013)regarding radiological outcomes,according to Matta and Tornetta's score in favor of the INFIX group.Sitting,standing,and walking abilities were measured at a 3-mo follow-up visit using Majeed score modules.It was significantly better among the INFIX group than the EXFIX group in all three modules.At the final follow-up,both groups had no statistically significant difference according to the Majeed score;92.35 in the INFIX group and 90.99 in the EXFIX group(P=0.513).A lower surgical site infection rate was noticed in the INFIX group(P=0.007).CONCLUSION Anterior subcutaneous pelvis INFIX is associated with better radiological outcomes and a lower infection rate than anterior supra-acetabular EXFIX in managing patients with unstable anterior pelvic ring fractures. 展开更多
关键词 Internal fixator External fixator UNSTABLE ANTERIOR PELVIC INJURIES
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Effects of surgical treatment modalities on postoperative cognitive function and delirium in elderly patients with extremely unstable hip fractures
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作者 Xue Zhou Xiao-Hua Chen +3 位作者 Sheng-Hua Li Nan Li Feng Liu Hao-Ming Wang 《World Journal of Psychiatry》 SCIE 2023年第8期533-542,共10页
BACKGROUND As the perioperative risk of elderly patients with extremely unstable hip fractures(EUHFs)is relatively high and therapeutic effect is not satisfactory,new therapeutic strategies need to be proposed urgentl... BACKGROUND As the perioperative risk of elderly patients with extremely unstable hip fractures(EUHFs)is relatively high and therapeutic effect is not satisfactory,new therapeutic strategies need to be proposed urgently to improve the efficacy and clinical outcomes of such patients.AIM To determine the influence of two surgical treatment modalities on postoperative cognitive function(CF)and delirium in elderly patients with EUHFs.METHODS A total of 60 elderly patients consecutively diagnosed with EUHF between September 2020 and January 2022 in the Chongqing University Three Gorges Hospital were included.Of them,30 patients received conventional treatment(control group;general consultation+fracture type-guided internal fixation),and the other 30 received novel treatment(research group;perioperative multidisciplinary treatment diagnosis and treatment+individualized surgical plan+risk prediction).Information on hip function[Harris hip score(HHS)],perioperative risk of orthopedic surgery[Physiological and Operative Severity Score for the Enumeration of Mortality and Morbidity(POSSUM)],CF[Montreal cognitive assessment scale(MoCA)],postoperative delirium[mini-cognitive(Mini-Cog)],adverse events(AEs;internal fixation failure,infection,nonunion,malunion,and postoperative delirium),and clinical indicators[operation time(OT),postoperative hospital length of stay(HLOS),ambulation time,and intraoperative blood loss(IBL)]were collected from both groups for comparative analyses.RESULTS The HHS scores were similar between both groups.The POSSUM score at 6 mo after surgery was significantly lower in the research group compared with the control group,and MoCA and Mini-Cog scores were statistically higher.In addition,the overall postoperative complication rate was significantly lower in the research than in the control group,including reduced OT,postoperative HLOS,ambulation time,and IBL.CONCLUSION The new treatment modality has more clinical advantages over the conventional treatment,such as less IBL,faster functional recovery,more effectively optimized perioperative quality control,improved postoperative CF,mitigated postoperative delirium,and reduced operation-related AEs. 展开更多
关键词 Extremely unstable hip fracture ELDERLY Multidisciplinary treatment Cognitive function Postoperative delirium
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Analysis on the Cause and Forecast Deviation of an Extreme Rainstorm in Changsha Urban Area
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作者 Yun FANG Tianyao SHEN +2 位作者 Sheng ZHOU Jingjing PENG Lijun CHENG 《Meteorological and Environmental Research》 CAS 2023年第1期50-55,59,共7页
Using NCEP reanalysis data,high-altitude and ground observation data,numerical model data,satellite and radar data,formation cause and forecast deviation of an extreme rainstorm process in Changsha urban area at night... Using NCEP reanalysis data,high-altitude and ground observation data,numerical model data,satellite and radar data,formation cause and forecast deviation of an extreme rainstorm process in Changsha urban area at night on June 9,2020 were analyzed.The results showed that(1)the extreme rainstorm process developed near the surface convergence line,with strong localization,short duration and large hourly rainfall intensity.(2)Under the high temperature and high humidity environment,the low-level cold advection and the hot low-pressure system interacted,and the potential con-vective unstable energy was released,and a strong convective weather was formed.(3)The convergence of water vapor in the lower layer and the strong upward movement provided sufficient water vapor for the rainstorm.The low-centroid thunderstorm was the main reason for the extreme rainstorm.(4)The forecast deviation of the numerical model to the low-level shear line and the mesoscale convergence line was an important reason for the forecast deviation of the heavy rainfall area. 展开更多
关键词 Extreme rainstorm Ground convergence line Unstable energy
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A Retrospective Analysis of the Patterns and Outcomes of Tile B and Tile C Pelvic Fractures in Cameroon
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作者 Chunteng Theophile Nana Tsiagadigui Tsiagadigui Jean Gustave +12 位作者 Ngo Yamben Marie-Ange Batchom Daudet Bombah Freddy Muluem Kenedy Mokake Divine Ngomba Ekani Boukar Mahamat Ali Mahamat Takou Bougoue Andre Gaetan Simo Wambo Tagakou Mboula Christian Fotso Ndasi Henry Pius Fokam 《Open Journal of Orthopedics》 2023年第4期157-167,共11页
Background: Pelvic fractures constitute about 2% - 8% of all fractures. This incidence may rise up to 25% in poly-traumatised patients. These fractures have a high mortality rate due to the fact that they occur usuall... Background: Pelvic fractures constitute about 2% - 8% of all fractures. This incidence may rise up to 25% in poly-traumatised patients. These fractures have a high mortality rate due to the fact that they occur usually as a result of high energy trauma, and most of the injured are poly-traumatised with concomitant haemodynamic instability. The aim of this study is to describe the patterns of injury and complications of unstable pelvic fractures treated in a level III hospital in Cameroon. Methodology: This was a hospital based retrospective analysis of files of patients admitted and treated for unstable pelvic fractures at the Regional Hospital Limbe within a period of 10 years (from 1<sup>st</sup> of January 2009 to 31<sup>st</sup> of December 2018). Results: A total of 139 cases of pelvic fractures were identified, amongst which 77 were unstable;68 were finally analyzed. The ages ranged from 18 to 80 years with a mean of 39 ± 5 years. The age group from 20 - 40 years was most represented (58.88%, n = 40). There were 45 males and 23 females giving a sex-ratio of 2:1. Road traffic injuries accounted for most of the cases (73.53%, n = 50). Forty-five (66.2%) were classified Tile B and 23 (33.82%) were Tile C, and 15 cases were open fractures (22.06%). Associated lesions were recorded in 30 cases, fractures of the lower extremity being the most common (33.33%, n = 10). Most of the cases were definitively treated surgically (80.89%, n = 55). The most common complications were surgical site infections (23.64%, n = 13). Conclusion: Unstable pelvic fractures are relatively common. Young males in the age group 20 - 40 years are the most affected, and the most common cause of injury was road traffic accident. Surgical site infections, pressure ulcers, severe anaemia and thrombo-embolism are common complications. 展开更多
关键词 UNSTABLE Pelvic Fracture PATTERNS COMPLICATIONS Cameroon
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Surgical Management of Unstable Superior Femoral Epiphysiolysis with Great Displacement
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作者 Kalifa Coulibaly Cheick Oumar Sanogo +7 位作者 Mahamdou Diallo Abdoul Kadri Moussa Laye Toure Soumana Traore Aboubacar Diallo Sory Ibrahim Tambassi Souleymane Diallo Ousmane Traoré 《Open Journal of Orthopedics》 2023年第4期173-181,共9页
Introduction: Superior femoral epiphysiolysis (SFE) is a most progressive but sometimes abrupt displacement of the femoral head relative to the superior femoral metaphysis through the cervicocerebral growth plate of t... Introduction: Superior femoral epiphysiolysis (SFE) is a most progressive but sometimes abrupt displacement of the femoral head relative to the superior femoral metaphysis through the cervicocerebral growth plate of the femur. The displacement of the femoral head is most often downward and backward. It is a typical pathology of the pubescent adolescent, most often overweight. It occurs on average at the age of 12 years in girls and 14 years in boys. Unstable forms with large displacements have a high risk of femoral head necrosis and chondrolysis. Although in situ fixation is the generally accepted treatment for minor SFE, the treatment of more severe cases remains controversial. When the extent of the displacement makes it impossible to pass a screw between the femoral neck and the femoral head, the only option is to reduce the displacement. This reduction must be gentle, progressive and limited to the minimum necessary for osteosynthesis. Objective: The aim of the work was to evaluate the results of the technique of progressive reduction of epiphyseal displacement by transtibial traction followed by percutaneous fixation of the femoral head by screw. Patients and Method: This was a retrospective descriptive study over a 10-years period from January 1, 2013 to December 31, 2022. It focused on the surgical treatment of unstable upper femoral epiphysiolysis with large displacement in the orthopaedic trauma department of the University Hospital of Kati. All patients operated on in our department for large displacement SFE were included in this study. Cases of secondary large displacement upper femoral epiphysiolysis and patients who had already undergone surgery on the proximal femur were excluded. Continuous progressive traction on the Boppe splint through a pin under the anterior tibial tuberosity was performed for 15 days in all patients. The hip was flexed to 45° and the knee to 35°. Fixation was performed with one or two screws. No contralateral preventive fixation was performed. Minimum follow-up was one year. Functional outcome was assessed by the Postel Merle d’Aubigné score. Anatomical outcome was assessed by the quality of reduction, the occurrence or non-occurrence of femoral head necrosis, and chondrolysis. Results: We identified nine patients with a mean age of 12.8 years and extremes of 9 and 17 years. There were three boys and six girls. Trauma was mentioned in four cases. The cause was idiopathic in five cases. Functional impotence was complete in all patients. The slippage was acute on a chronic background in all patients. The left side was affected in 7 cases and the right side in 2 cases. The patients were overweight in 7 cases. The patient’s weight was within the normal range in two cases. At final follow-up, all nine patients were asymptomatic. Anatomically, all nine patients had a femoral head free of avascular necrosis. In eight patients, the posterior tilt was absent, identical to that obtained after the traction period. Only one patient had a moderate posterior tilt with a neck uncovering of less than 25%. Functionally, the PMA score was very good in eight cases and good in one case. Conclusion: This study shows that the treatment of acute and unstable forms of upper femoral epiphysiolysis by progressive reduction with transtibial traction can lead to satisfactory results. Reduction in large displacement forms should be gentle, progressive and limited to the minimum necessary for osteosynthesis. Magnetic resonance imaging examination is an essential and indispensable prognostic element. Indications for preventive fixation should be selectively reserved for specific cases. 展开更多
关键词 Epiphysiolysis UNSTABLE Femoral Head Continuous Traction
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Two-Dimensional Manifolds with Computation V-Function of ODE Systems
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作者 Suqi Ma Bohan Ma Xinping Wang 《International Journal of Modern Nonlinear Theory and Application》 2023年第4期99-106,共8页
The computation of stable or unstable manifold of two-dimensional is developed, which is an efficient method in studying stable structure analysis of system character geometrically. The Lorentz stable manifold is comp... The computation of stable or unstable manifold of two-dimensional is developed, which is an efficient method in studying stable structure analysis of system character geometrically. The Lorentz stable manifold is computed by the fixed arclength method and the hyperbolic equilibrium is a saddle. The two-dimensional stable structure of Lorentz manifold is significant in people’s usual view. We also introduce the V-function to compute the V-manifold correspondingly. The defined V-function is smooth in the unstable direction of the manifold. Especially, the routh to period-doubling attractor on manifold surface is discussed too. 展开更多
关键词 Stable Manifold Unstable Manifold V-Function Attraction Boundary
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Distinct roles of the IRE1αarm and PERK arm of unfolded protein response in arachidonic acid-induced ferroptosis in hepatocytes
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作者 Han Zhang Kai Han +3 位作者 Shutao Yin Lihong Fan Hongbo Hu Chong Zhao 《Food Innovation and Advances》 2023年第3期184-192,共9页
Ferroptosis is a distinct form of cell death that is driven by iron-dependent phospholipid peroxidation.Polyunsaturated fatty acids(PUFAs),particularly arachidonic acid(AA)and adrenal acid(AdA),are most prone to lipid... Ferroptosis is a distinct form of cell death that is driven by iron-dependent phospholipid peroxidation.Polyunsaturated fatty acids(PUFAs),particularly arachidonic acid(AA)and adrenal acid(AdA),are most prone to lipid peroxidation,which induces ferroptosis and affects the function of cell membranes.In this study,we discovered that AA induces ferritinophagy in hepatocytes,a selective form of autophagy that degrades ferritin,triggering unstable iron overload.Mechanistically,AA enhances cellular uptake of bound iron by up-regulating transferrin receptor 1(TfR1).Additionally,AA induces endoplasmic reticulum stress(ER stress)and simultaneously activates two of its branches,pancreatic ER kinase(PERK)and inositol-requiring enzyme 1(IRE1).Notably,PERK and IRE1 appear to play distinct roles in inducing ferritinophagy.Inhibition of PERK reduced the AA-induced increase of Fe^(2+)by alleviating ferritinophagy,while inhibition of IRE1 further exacerbated ferroptosis by activating ferritinophagy.Furthermore,there seems to be an interaction between the signaling pathways of ER stress,and inhibition of IRE1 exacerbates AA-induced ferritinophagy by further activating the PERK signaling pathway,thereby exacerbating the extent of cell death.Collectively,our findings suggest that iron overload is involved in AA-induced hepatocyte ferroptosis and that this process is regulated by ER stress-mediated ferritinophagy.This study suggests potential therapeutic strategies for treating liver diseases related to lipid metabolism disorders by intervening in the ferroptosis process. 展开更多
关键词 PEROXIDATION METABOLISM UNSTABLE
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Strategies for Advancing Road Construction Slope Stability: Unveiling Innovative Techniques for Managing Unstable Terrain
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作者 Guy Oyéniran Adeoti Judicaël Koffi Agbelele +2 位作者 Crespin Prudence Yabi Rufin Nongnidé Kinhoun Éric Adéchina Alamou 《Open Journal of Civil Engineering》 2023年第4期572-616,共45页
This comprehensive review paper explores various aspects of geotechnical engineering, with a focus on the management of unstable terrains, numerical methods for solving complex soil and consolidation problems, rheolog... This comprehensive review paper explores various aspects of geotechnical engineering, with a focus on the management of unstable terrains, numerical methods for solving complex soil and consolidation problems, rheological analysis of suspensions and muddy soils, and stability analysis of slopes. It begins by examining the unique physicochemical properties of cohesive sediments, including cohesion and specific surface area. The temporal evolution of deposit concentration and average bed concentration in unstable terrains is discussed, along with settling behavior of isolated particles and hindered settling using empirical equations. Key sedimentation theories, such as Kynch’s theory, and geotechnical consolidation theories, including Terzaghi’s consolidation equation and Gibson’s theory, are presented. The investigation interrelates these theories and principles to offer a holistic view of managing unstable terrains. It also addresses the challenges associated with experimental determination of constitutive relationships and presents alternative simplification methods proposed by researchers. Additionally, it delves into numerical methods for solving nonlinear partial differential equations governing soil behavior, emphasizing the need for numerical frameworks and discussing various techniques and associated challenges. The rheological analysis section covers material flow behavior, rheological behavior models, and the rheological properties of water and cohesive sediment mixtures. Fundamental geotechnical calculations, constitutive laws, and failure criteria are explained, highlighting their relevance in geotechnical engineering applications. This paper provides a multidimensional perspective on geotechnical engineering, offering valuable insights into soil properties, consolidation processes, numerical methods, rheological analysis, and slope stability assessment for professionals in the field. 展开更多
关键词 Consolidation Processes Managing Unstable Terrain Numerical Methods Safety Coefficient Slope Stability Assessment Soil Cohesion
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