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Endoscopic therapy of weight regain after bariatric surgery 被引量:1
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作者 Milutin Bulajic Salvatore Francesco Vadalà di Prampero +1 位作者 Ivo Boškoski Guido Costamagna 《World Journal of Gastrointestinal Surgery》 SCIE 2021年第12期1584-1596,共13页
Weight regain following primary bariatric surgery occurs in a significant proportion of patients and is attributed to epidemiological,anatomical and metabolic factors.Surgical revision of these patients has significan... Weight regain following primary bariatric surgery occurs in a significant proportion of patients and is attributed to epidemiological,anatomical and metabolic factors.Surgical revision of these patients has significant risks and limited benefits.Endoscopic revisions that reduce gastric pouch size and diameter of the gastrojejunal anastomosis may offer an effective,safe,less invasive and even reproducible treatment.We herein discuss the indication,selection and feasibility of different endoscopic techniques that could be used in the management of weight regain following primary bariatric surgery.Future research could optimize a personalized approach not only in the endoscopic management but also in combination with other therapeutic modalities for weight regain after bariatric surgery. 展开更多
关键词 Morbid obesity Weight regain Endoscopic sleeve gastroplasty Transoral outlet reduction Bariatric surgery Full thickness suturing
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Determinates of Regain in Body Mass Index among Malnourished Aids Patients on Therapeutic Food in Amhara National Regional State, Northwest Ethiopia: A Retrospective Cohort Study
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作者 Molla Gedefaw Moges Tariku 《Open Journal of Epidemiology》 2015年第2期122-128,共7页
Although its utilization is greatly disputed, ready-to-use therapeutic food has been started as clinical nutrition care and treatment for malnourished adult AIDS patients since 2011 in Amhara National Regional State. ... Although its utilization is greatly disputed, ready-to-use therapeutic food has been started as clinical nutrition care and treatment for malnourished adult AIDS patients since 2011 in Amhara National Regional State. However, factors determining the intended outcome (weight gain) have not been properly investigated. The main objective of the study was to assess improvement in body mass index and to identify its determinant factors. A retrospective cohort study design was conducted. Cluster sampling was employed to select health facilities in which the service was provided in the region. Of the 44 health facilities, nine were selected using lottery method, and all patients receiving the care in these health institutions were included in the study. Using tailored structured checklist, data were collected, organized and cleaned. Using paired T-test existence of difference between the mean of body mass index at admission and at 3rd visit was measured. Finally analysis of association between some selected independent variables with the outcome variable was done using logistic regression model at 95% CI and p 2). Paired T-test revealed that there was a statistically significant difference between mean of body mass index at admission and at the 3rd visit. Good ready-to-use therapeutic food treatment adherence (AOR 11.145;95% CI 6.556, 18.946), moderate acute malnutrition at admission (AOR 6.71;95% CI 2.618, 17.195), good ART adherence (AOR 2.136;95% CI, 1.269, 3.595) and being male (AOR 1.73;95% CI 1.052, 2.850) have a statistically significant contribution for body mass index improvement. The study identifies factors that determine gain in body mass index among AIDS patients on ready-to-use therapeutic food. However, although the study revealed a statistically significant difference between body mass index during enrolment, and after three months, we disagreed with the right and left utilization of imported food because of lack of sustainability, and aid dependency. We rather recommend interventions that encourage households to produce food with similar outcomes from locally available food staff. 展开更多
关键词 THERAPEUTIC FOOD BODY Mass Index regain AIDS Ethiopia
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Weight regain after bariatric surgery: Promoters and potential predictors
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作者 Hala Mourad Demerdash 《World Journal of Meta-Analysis》 2021年第5期438-454,共17页
Obesity is globally viewed as chronic relapsing disease.Bariatric surgery offers the most efficient and durable weight loss approach.However,weight regain after surgery is a distressing issue as obesity can revert.Sur... Obesity is globally viewed as chronic relapsing disease.Bariatric surgery offers the most efficient and durable weight loss approach.However,weight regain after surgery is a distressing issue as obesity can revert.Surgical procedures were originally designed to reduce food intake and catalyze weight loss,provided that its role is marginalized in long-term weight maintenance.Consequently,it is essential to establish a scientifically standardized applicable definitions for weight regain,which necessitates enhanced comprehension of the clinical situation,as well as have realistic expectations concerning weight loss.Moreover,several factors are proposed to influence weight regain as psychological,behavioral factors,hormonal,metabolic,anatomical lapses,as well as genetic predisposition.Recently,there is a growing evidence of utilization of scoring system to anticipate excess body weight loss,along with characterizing certain biomarkers that identify subjects at risk of suboptimal weight loss after surgery.Furthermore,personalized counseling is warranted to help select bariatric procedure,reinforce self-monitoring skills,motivate patient,encourage mindful eating practices,to avoid recidivism. 展开更多
关键词 Weight regain Bariatric surgery HORMONES DIET EXERCISE Genetic factors
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The Hundred-Old Party Regains Its Former Gallantry
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作者 Dao Shulin Su Jingxiang Hu Shisheng Fu Xiaoqiang Ma Jiali Zhang Siqi 《Contemporary International Relations》 2004年第7期11-18,共8页
关键词 The Hundred-Old Party regains Its Former Gallantry
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China Action to Help Cataract Suffers Regain Eyesight
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作者 SHIYONGHONG 《China's Tibet》 1998年第6期16-17,共2页
关键词 China Action to Help Cataract Suffers regain Eyesight
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Mechanism of weight regain-The role of epigenetic modification in adipocytes
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作者 Yue Zhao Xiwen Ma Jianping Ye 《Acta Pharmaceutica Sinica B》 2025年第9期4961-4963,共3页
Weight regain(WR)is a significant challenge in clinical treatment of obesity after successful weight loss.WR happens frequently after weight loss(WL)by dietary or life style adjustment although it also occurs in WL by... Weight regain(WR)is a significant challenge in clinical treatment of obesity after successful weight loss.WR happens frequently after weight loss(WL)by dietary or life style adjustment although it also occurs in WL by bariatric surgery and medications1-3.A general mechanism of WR is“obesity memory”,which refers to a stable gene expression pattern in adipose tissue from obesity.However,the molecular mechanisms underlying obesity memory remain unclear.Recently,Hinte et al.1 reported that obesity memory is mediated by an epigenetic mechanism in adipocytes of adipose tissue in a Nature article. 展开更多
关键词 Weight regain Epigenetic modification Weight loss OBESITY Adipose tissue
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Comparison of the ability of wavelet index and bispectral index for reflecting regain of consciousness in patients undergone surgery 被引量:15
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作者 ZHANG Xiao-tong CHENG Hao XIONG Wei WANG Bao-guo 《Chinese Medical Journal》 SCIE CAS CSCD 2010年第12期1520-1523,共4页
Background Wavelet index (WLI) is a new parameter for monitoring depth of anesthesia based on Wavelet analysis. We observed the change of WLI and bispectral index (BIS) in patients regain of consciousness (ROC) ... Background Wavelet index (WLI) is a new parameter for monitoring depth of anesthesia based on Wavelet analysis. We observed the change of WLI and bispectral index (BIS) in patients regain of consciousness (ROC) in the absence of frontalis electromyographic (EMG) interference. The aim of this study was to compare the ability of WLI and BIS for reflecting ROC in patients undergone surgery. Methods Twelve patients who were scheduled for maxillofacial surgeries were enrolled in the study. BIS and WLI values were monitored continually. After being given midazolam and remifentanil, patients were asked to squeeze the investigator's hand ever 30 seconds. Patients were continuously given propofol until loss of consciousness (LOC1). Tunstalrs isolated forearm technique was used to test the surgical consciousness in patients. After total muscle relaxation endotracheal intubations were performed, and the patients were connected to a ventilator. Then, propofol was withdrawn until the patients showed regain of consciousness (ROC1) and an awareness reaction. After the command test, patients were readministered with propofol until loss of consciousness (LOC2). After surgery, all of the sedatives were withdrawn, and the patients were let to regain consciousness (ROC2), Results The BIS values of twelve patients at ROC1 after using muscle relaxant were much lower than those at LOC1 and ROC2 without using muscle relaxant, showing statistical significance (P 〈0.05). Meanwhile, the WLI values of twelve patients at ROC1 after using muscle relaxant were much higher than those at LOC1 and equal to ROC2 without using muscle relaxant, showing statistical significances (P 〈0.05) between ROC1 and LOCI. Conclusions This study showed that under muscle relaxation or facial paralysis, when there is no EMG signal, BIS can not accurately reflect regain of consciousness in surgical patients, but WLI can reflect it accurately. So WLI may have advantages for reflecting state of consciousness in surgical patients. 展开更多
关键词 frontalis electromyographic activity wavelet index bispectral index tunstall's isolated forearmexperiments regain of consciousness
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CD4+T cells memorize obesity and promote weight regain 被引量:4
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作者 Jianghuan Zou Beibei Lai +10 位作者 Mingzhu Zheng Qin Chen Shujun Jiang Anying Song Zan Huang Peiliang Shi Xin Tu Di Wang Linrong Lu Zhaoyu Lin Xiang Gao 《Cellular & Molecular Immunology》 SCIE CAS CSCD 2018年第6期630-639,共10页
Body weight regain often causes failure of obesity therapies while the underlying mechanism remains largely unknown.In this study,we report that immune cells,especially CD4+T cells,mediate the‘memory’of previous obe... Body weight regain often causes failure of obesity therapies while the underlying mechanism remains largely unknown.In this study,we report that immune cells,especially CD4+T cells,mediate the‘memory’of previous obese status.In a weight gain-loss-regain model,we found that C57BL/6J mice with an obesity history showed a much faster rate of body weight regain.This obesity memory could last for at least 2 months after previously obese mice were kept at the same body weight as non-obese mice.Surprisingly,such obesity memory was abrogated by dexamethasone treatment,whereas immunodeficient Rag1−/−and H2A−/−mice failed to establish such memory.Rag1−/−mice repossessed the obesity memory when immune cells or CD4+T cells isolated from previously obese mice were transferred.Furthermore,depletion of CD4+T cells led to obesity memory ablation.Taken together,we conclude that CD4+T cells mediate obesity memory and promote weight regain. 展开更多
关键词 CD4+T cell IMMUNODEFICIENCY METABOLISM obesity memory weight regain
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基于电阻法的皮棉回潮率在线检测装置设计与试验
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作者 徐健康 王培宇 +4 位作者 张若宇 钱一夫 方亮 常金强 刘遵严 《农业机械学报》 北大核心 2026年第4期97-107,共11页
针对棉花加工过程中负压环境下定量取样困难、回潮率实时在线检测精度低且稳定性差等问题,研制了一种基于电阻法的皮棉回潮率在线检测装置,提出了一种“动态定量取样—称量恒压测量—多参数补偿”的在线检测方法,设计了翻转式取样机构... 针对棉花加工过程中负压环境下定量取样困难、回潮率实时在线检测精度低且稳定性差等问题,研制了一种基于电阻法的皮棉回潮率在线检测装置,提出了一种“动态定量取样—称量恒压测量—多参数补偿”的在线检测方法,设计了翻转式取样机构和称量检测机构等关键部件,实现了皮棉在高速流动状态下稳定采样与连续检测。基于皮棉电阻特性及环境温湿度信息,构建了多参数回潮率预测模型,并通过多种算法对比,确定随机森林模型具有最佳预测性能,其决定系数为0.98,均方根误差为0.22%。开展装置性能验证试验,结果表明,该在线检测装置与标准测定仪的平均偏差为0.1%,单次检测平均耗时为23.4 s,样本质量对回潮率测量结果影响较弱(Pearson相关系数为0.47)。试验结果表明,该装置具有较高的检测精度和良好的稳定性,能够满足棉花加工过程对回潮率在线检测的实时性和准确性需求,为棉花加工过程的智能调控与质量追溯提供了可靠技术支撑。 展开更多
关键词 皮棉 定量取样 回潮率 电阻法 在线检测
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采棉机籽棉回潮率传感器设计与试验
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作者 方亮 刘康 +4 位作者 黄杰 常金强 石喻文 曾兆权 张若宇 《农业机械学报》 北大核心 2026年第4期62-71,共10页
针对采棉机在采收作业中,籽棉回潮率在线检测受环境温度与接触压力干扰大的问题,本文基于电阻法原理,设计了一种集成温度与压力补偿机制的采棉机籽棉回潮率传感器。通过优化电阻检测电路以拓宽测量范围,结合温度与压力传感单元,设计了... 针对采棉机在采收作业中,籽棉回潮率在线检测受环境温度与接触压力干扰大的问题,本文基于电阻法原理,设计了一种集成温度与压力补偿机制的采棉机籽棉回潮率传感器。通过优化电阻检测电路以拓宽测量范围,结合温度与压力传感单元,设计了可同步采集环境温度、接触压力及籽棉电阻的传感器硬件系统,并进行了校准与性能测试。搭建试验平台分析了温度、压力及回潮率对籽棉导电特性的影响规律,建立了融合多参数补偿的回潮率预测模型,结果表明,所设计的硬件电路温度测量平均绝对误差小于0.4℃,压力测量平均相对误差小于0.2%,电阻测量平均相对误差小于3%;回潮率预测模型中BPNN算法效果最佳,决定系数(R^(2))为0.986,均方根误差(RMSE)为0.377%。为了验证回潮率传感器的可靠性,进行了室内静态和田间收获试验。室内静态试验结果表明,传感器检测范围为4%~15%,平均绝对误差为0.22%,平均相对误差为2.32%;田间收获试验结果表明,检测结果绝对误差不大于0.5%,相对误差不大于4.32%。研究结果为采棉机籽棉回潮率在线检测提供有效的技术支撑。 展开更多
关键词 籽棉回潮率 采棉机 电阻法 传感器 补偿算法
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发制品甲醛含量及回潮率与材质的相关性研究
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作者 吴中佳 周文 居政翔 《广东化工》 2026年第1期33-35,89,共4页
采用分光光度法和烘箱干燥法分别研究了化学纤维、动物纤维、人发和混合材质对发制品甲醛含量和回潮率的影响。结果表明,100.00%化学纤维材质发制品的甲醛含量和回潮率都较低,其甲醛含量在1.00~20.00 mg·kg^(-1)之间,平均值为8.55 ... 采用分光光度法和烘箱干燥法分别研究了化学纤维、动物纤维、人发和混合材质对发制品甲醛含量和回潮率的影响。结果表明,100.00%化学纤维材质发制品的甲醛含量和回潮率都较低,其甲醛含量在1.00~20.00 mg·kg^(-1)之间,平均值为8.55 mg·kg^(-1),回潮率介于0.60%~4.50%之间,平均值为1.47%。动物纤维发制品和人发发制品的甲醛含量和回潮率都十分接近,但整体数值都偏高。其中,动物纤维发制品甲醛含量的范围为25.00~67.00 mg·kg^(-1),平均值为42.33 mg·kg^(-1),回潮率介于4.80%~12.40%之间,平均值为9.54%。混合材质发制品的甲醛含量和回潮率都分别介于100.00%化学纤维发制品和动物纤维/人发发制品的甲醛含量和回潮率之间。并且,动物纤维/人发的含量越高,其甲醛含量和回潮率也呈升高的趋势。不同材质发制品甲醛含量和回潮率的数值范围可用于辅助鉴别发制品的具体材质。 展开更多
关键词 发制品 甲醛 回潮率 分光光度法 化学纤维
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Made-in-China Regains Face
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作者 ZHANG ZHIPING 《Beijing Review》 2007年第50期2-2,共1页
As the grand celebration of Christmas Day approaches,people all over the world once again get caught up in the festive atmosphere that embraces the traditional spending spree.And being a time for children and gift giv... As the grand celebration of Christmas Day approaches,people all over the world once again get caught up in the festive atmosphere that embraces the traditional spending spree.And being a time for children and gift giving,it’s almost a given that most of us will be buying a toy at this holiday season.The chances that the toy chosen will carry a"Made-in-China"label are high as more than 80 percent of the world’s toys are now made here. 展开更多
关键词 AS Made-in-China regains Face
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Regaining Trust
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作者 By AN ZI 《Beijing Review》 2006年第25期38-41,共4页
Chinese consumers still lack confidence in Bausch & Lomb contact lens care products after some users in Singapore and elsewhere developed eye problems Since cases of keratitis, an eye infection linked to contact l... Chinese consumers still lack confidence in Bausch & Lomb contact lens care products after some users in Singapore and elsewhere developed eye problems Since cases of keratitis, an eye infection linked to contact lens use, were reported in Singapore earlier this year, the safety of Bausch & Lomb's contact lens solution has raised doubts in many regions and countries. China, a big consumer of contact lenses, 展开更多
关键词 PRO regaining Trust
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基于光电成像的籽棉回潮率与含杂率检测 被引量:1
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作者 夏彬 王会博 +3 位作者 高云龙 孟永法 李梦辉 王飞 《毛纺科技》 北大核心 2025年第9期110-115,共6页
针对籽棉回潮率与含杂率检测速度慢、效率低等问题,提出了一种基于光电成像的籽棉回潮率与含杂率检测方法。搭建了由棉样输送机构、压棉机构、回潮率光电检测机构、含杂率图像采集机构、数据处理与显示机构组成的试验系统,采用电阻分压... 针对籽棉回潮率与含杂率检测速度慢、效率低等问题,提出了一种基于光电成像的籽棉回潮率与含杂率检测方法。搭建了由棉样输送机构、压棉机构、回潮率光电检测机构、含杂率图像采集机构、数据处理与显示机构组成的试验系统,采用电阻分压原理建立了电阻值与回潮率数学模型,同时,采用RGB双面成像方法建立了图像含杂面积与含杂率的检测模型,实现了籽棉回潮率与含杂率的快速检测。试验结果表明:与现行标准检测方法相比,本文回潮率方法的绝对误差均值为±0.31%,其中,在4%~7%的低回潮区间,检测的绝对误差为±0.19%;含杂率检测方法的绝对误差均值为±0.36%,验证了该方法的检测精度与有效性,可为籽棉回潮率与含杂率仪器化检测提供技术参考。 展开更多
关键词 籽棉回潮率 籽棉含杂率 光电成像 检测
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轧花前籽棉加湿对北疆机采细绒棉加工质量的影响 被引量:2
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作者 秦建锋 史书伟 +2 位作者 孟永法 李梦辉 夏彬 《纺织学报》 北大核心 2025年第6期96-102,共7页
为探究我国新疆北部棉区机采细绒棉加工过程中轧花前籽棉加湿对皮棉加工质量的影响,选取奎屯市某机采棉加工生产线,改造二道干燥单元为调湿单元,采用同一块地同一时段采摘、储存条件相同的籽棉为试验材料,以二道调湿环节空气温度为试验... 为探究我国新疆北部棉区机采细绒棉加工过程中轧花前籽棉加湿对皮棉加工质量的影响,选取奎屯市某机采棉加工生产线,改造二道干燥单元为调湿单元,采用同一块地同一时段采摘、储存条件相同的籽棉为试验材料,以二道调湿环节空气温度为试验因素,以回潮率、含杂率、棉纤维长度、长度整齐度指数和断裂强度为棉加工质量指标,设计单因素试验分析因素对评价指标的影响。结果表明:轧花前籽棉加湿对棉花回潮率影响显著,且回潮率增加,但相比籽棉回潮率的增加量,皮棉回潮率提升的量较小;轧花前籽棉加湿对皮棉含杂率影响不显著,对皮棉棉纤维长度、长度整齐度指数及断裂强度的影响显著,且棉纤维长度、长度整齐度指数及断裂强度与棉花回潮率增加量呈正相关。 展开更多
关键词 棉花 机采棉 轧花 调湿 回潮率 含杂率 棉纤维长度 断裂强度
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司美格鲁肽治疗减重术后减重不足或体质量反弹患者有效性与安全性的Meta分析 被引量:2
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作者 边识博 张翊乔 +1 位作者 张萌 刘洋 《中国普通外科杂志》 北大核心 2025年第4期676-685,共10页
背景与目的:大约20%~25%人群在减重术后出现减重不足(IWL)或体质量反弹(WR)的情况,而有关司美格鲁肽在减重术后患者中的应用研究较少,药物的有效性和安全性有待验证。因此,本研究通过系统评价探讨司美格鲁肽用于减重术后IWL或WR患者治... 背景与目的:大约20%~25%人群在减重术后出现减重不足(IWL)或体质量反弹(WR)的情况,而有关司美格鲁肽在减重术后患者中的应用研究较少,药物的有效性和安全性有待验证。因此,本研究通过系统评价探讨司美格鲁肽用于减重术后IWL或WR患者治疗的有效性和安全性,为临床决策提供证据支持。方法:计算机检索多个国内外数据库,收集关于司美格鲁肽在减重术后IWL或WR患者中应用的相关研究,检索时间为建库至2024年7月1日。按照纳入和排除标准筛选文献后,使用Stata 14.0软件进行分析。结果:最终共纳入5项研究,均为回顾性研究,共289例患者在减重术后接受了司美格鲁肽治疗。分析结果显示,与治疗前相比,司美格鲁肽使用后总体质量下降10.66%(MD=10.66%,95%CI=6.47%~14.89%);患者体质量指数降低3.57 kg/m2(MD=3.57 kg/m2,95%CI=2.46~4.67 kg/m2);不同手术方式对体质量下降程度不产生影响(P>0.05);用药后体质量下降>5%患者所占比例为80%(OR=0.8,95%CI=0.76~0.85)、体质量下降>10%患者所占比例为45%(OR=0.45,95%CI=0.41~0.50)、体质量下降>15%患者所占比例为18%(OR=0.18,95%CI=0.08~0.27);IWL或WR患者中以行胃袖状切除术为主(69.8%);用药前后糖化血红蛋白水平差异无统计学意义(P>0.05);药物不良事件发生率为14%(OR=0.14,95%CI=0.01~0.28),以胃肠道不良反应为主。结论:司美格鲁肽可以显著降低减重术后IWL或WR患者的体质量,且药物的不良反应发生率较低,可应用于减重术后体质量下降效果不理想的患者,但是仍需要前瞻性、大规模临床研究的进一步验证。 展开更多
关键词 减肥手术 减重不足 体质量反弹 司美格鲁肽 META分析
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烟叶箱式烘烤高温蒸汽回潮装置设计及其工艺优化 被引量:2
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作者 葛维一 朱治忠 +5 位作者 蒋宸光 赵浩宾 王亚飞 路晓崇 遆晋松 尹光庭 《西北农林科技大学学报(自然科学版)》 北大核心 2025年第3期147-156,共10页
【目的】解决箱式烘烤在回潮环节回潮难、均匀性差等问题。【方法】设计了一种适用于烤后烟叶快速回潮的高温蒸汽回潮装置;然后以回潮装置的参数蒸汽温度、装烟密度和运转时间为试验因素,以烟叶含水率和有效吸水率为试验指标进行Box-Beh... 【目的】解决箱式烘烤在回潮环节回潮难、均匀性差等问题。【方法】设计了一种适用于烤后烟叶快速回潮的高温蒸汽回潮装置;然后以回潮装置的参数蒸汽温度、装烟密度和运转时间为试验因素,以烟叶含水率和有效吸水率为试验指标进行Box-Behnken三因素三水平试验,建立多元回归方程并进行响应面分析,优化高温蒸汽回潮工艺。【结果】Box-Behnken三因素三水平试验结果表明,烟叶含水率和有效吸水率回归模型的拟合系数R^(2)分别为0.9825和0.9957,回潮机的蒸汽温度、装烟密度和回潮机运转时间对烟叶含水率和有效吸水率的影响均达到极显著水平(P<0.01);交互作用分析结果表明,回潮机蒸汽温度与回潮机运转时间对烟叶含水率有显著影响(P<0.05),回潮机蒸汽温度与装烟密度、装烟密度与回潮机运转时间均对有效吸水率有显著影响(P<0.05)。箱式烘烤高温蒸汽回潮烟叶的优化工艺参数为:蒸汽温度115.00℃,装烟密度90.85 kg/m^(3),运转时间3.47 h,在该工艺条件下烟叶含水率为17.71%,有效吸水率为89.75%,各响应指标试验值与模型优化值的相对误差均小于2%。【结论】采用高温蒸汽回潮可有效提高箱式烘烤的回潮效率。 展开更多
关键词 烟草 箱式烤房 高温蒸汽设备 回潮工艺优化 响应面分析
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基于电阻法的棉花束纤维回潮率检测方法 被引量:1
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作者 张建强 黄杰 +3 位作者 常金强 崔国金 王洋 张若宇 《农业机械学报》 北大核心 2025年第5期150-158,共9页
回潮率严重影响棉花品质检测结果,精确测量回潮率对棉花分级意义重大。针对在棉花束纤维断裂比强度检测中回潮率的补偿校正问题,提出了一种基于电阻法的棉花束纤维回潮率检测方法。通过搭建电阻-图像同步采集平台,利用图像特征表征棉层... 回潮率严重影响棉花品质检测结果,精确测量回潮率对棉花分级意义重大。针对在棉花束纤维断裂比强度检测中回潮率的补偿校正问题,提出了一种基于电阻法的棉花束纤维回潮率检测方法。通过搭建电阻-图像同步采集平台,利用图像特征表征棉层厚度,探究在电阻法测回潮率时,电极间距、温度及棉层厚度对电阻测量的影响规律,建立以电阻、温度为输入变量的多元预测模型。实验结果表明:图像灰度特征与电阻高度相关且呈非线性关系,探明了棉层厚度对电阻测量的影响规律;电阻在电极间距为2~12 mm范围内呈显著正相关,解释了电极间距增大导致电阻测量误差扩大的内在机制,基于此,确立电极间距2 mm为最优检测参数,验证了该参数下不同品质棉花束纤维电阻无显著性差异(P>0.05)。进行32组4.44%~12.2%回潮率棉样实验,结果显示随机森林(Random forest,RF)模型预测精度最优,其R^(2)为0.99,均方根误差为0.24%。本研究突破传统松散团状棉纤维回潮率检测限制,实现了束状纤维回潮率快速测量,可为棉花断裂比强度等物理性能指标的精准补偿校正提供技术支撑。 展开更多
关键词 棉花束纤维 回潮率检测 电阻法 图像分析
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漫谈变风量空调系统优化设计 被引量:3
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作者 陈向阳 《暖通空调》 2025年第1期15-22,共8页
讨论了变风量空调系统设计中有关短风道多机房、双风机系统、风道同程设计、三通风管旁通管的静压复得、末端风管的对称同程设计、软管的使用、变风量末端装置选型等设计因素。通过对这些问题的探讨,明确了优化变风量空调系统设计的方向。
关键词 变风量空调系统 优化设计 室内静压控制 双风机 风道同程 静压复得 变风量末端装置
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基于Stacking集成的籽棉回潮率信息融合检测方法研究 被引量:2
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作者 钱一夫 黄杰 +2 位作者 方亮 段宏伟 张梦芸 《农业机械学报》 北大核心 2025年第5期159-166,共8页
针对棉花采收和收购环节中籽棉回潮率检测工序复杂、受人工影响因素较大、检测精度低的问题,提出了一种基于电阻技术的信息融合检测方法。分别采集了环境温湿度以及籽棉电阻、密度与回潮率,分析了籽棉回潮率随环境温湿度变化规律,讨论... 针对棉花采收和收购环节中籽棉回潮率检测工序复杂、受人工影响因素较大、检测精度低的问题,提出了一种基于电阻技术的信息融合检测方法。分别采集了环境温湿度以及籽棉电阻、密度与回潮率,分析了籽棉回潮率随环境温湿度变化规律,讨论了籽棉密度对籽棉电阻检测的影响,确定了籽棉电阻与回潮率的关系。为了提高籽棉回潮率检测的精确性和稳定性,融合环境温湿度及籽棉电阻和密度作为特征变量,将“环境参数-物理特性-电学特性”进行数据关联;建立多元线性回归、支持向量回归、随机森林等5类回归模型,采用“模型竞争-集成优化”策略建立堆叠集成融合模型预测回潮率,实现了数据级和决策级的信息融合。结果表明,基于信息融合的堆叠集成模型为最优回潮率预测模型,在测试数据集上其决定系数R^(2)为0.994,平均绝对误差(MAE)为0.104%,均方根误差(RMSE)为0.151%,验证了信息融合检测方法的可靠性。该方法可为棉花采收打包和收购环节的回潮率检测提供数据支撑。 展开更多
关键词 籽棉回潮率 信息融合 堆叠集成融合模型 电阻检测 回归预测模型
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