Effects of electroacupuncture at lower he-sea points on interleukin-1β and high mobility group box 1 in model rats with ulcerative colitis

Objective To comparatively observe the effect of electroacupuncture at digestive system-related lower he-sea points on the expressions of serum interleukin-1β（IL-1 β）, tumor necrosis factor-α（TNF-α） of colon tissues and high mobility group box 1 protein（HMGB 1） of ulcerative colitis（UC） model rats, and to explore whether there is relative specificity of electroacupuncture at Shàngjùxū（上巨虚 ST 37）, one of lower he-sea points of large intestine, in treatment of bowel diseases. Method A total of 60 SD rats were randomly divided into control group, model group, ST 37 group, Zúsānl？（足三里 ST 36） group, Xiàjùxū（下巨虚 ST 39） group and Yánglíngquán（阳陵泉 GB 34） group. There were ten rats in each group; five were males, and five were females. UC models were established by clysis with 2, 4, 6-trinitrobenzene sulfonic acid/alcohol solution. After modeling, treatment was conducted for ten days, specimens were collected, colonic ulcers and inflammation were inspected visually and scored. The content of serum IL-1β and the expressions of TNF-α and HMGB 1 in colon were detected through ELISA. Results 1 Compared with control group, the scores of colonic ulcers and inflammation, the content of serum IL-1β and the expressions of TNF-α（except ST 37 group） and HMGB 1 were all higher（P〈0.05, P〈0.01）; 2 compared with model group, the scores of colonic ulcers in ST 36 group and ST 37 group were lower obviously（P〈0.05, P〈0.01）; the expressions of IL-1β, TNF-α and HMGB 1 in the four treatment groups were lower obviously（P〈0.01）; 3 compared with ST 37 group, the expressions of IL-1β, TNF-α and HMGB 1 in other three treatment groups were higher obviously（P〈0.05, P〈0.01）; and the scores of colonic ulcers in ST 39 group and GB 34 group were higher obviously（P〈0.05）. Conclusion 1 The score of colonic ulcers can be reduced through electroacupuncture at ST 37, ST 36, ST 39 and GB 34, which can also reduce the content of serum IL-1β and the expressions of TNF-α and HMGB 1, and effectively inhibit inflammatory response of colon caused by UC; 2 the effect trend of the four acupoints in treatment of UC is： ST 37ST 36ST 39GB 34, and electroacupuncture at ST 37 has the best effect with relative specificity.

Effect of electroacupuncture at“ Zúsānlǐ”(足三里 ST 36) and other lower he-sea points on the expression of TNF-α and NF-κB of acute gastric mucosal lesion rats

Objective To contrastively observe the effect of electroacupuncture at lower he-sea points of stomach, large intestine, small intestine and gallbladder of acute gastric mucosal lesion（AGML） model rats on the expression of serum high mobility group protein B 1（HMGB 1）, tumor necrosis factor-α（TNF-α） and nuclear factor-κB（NF-κB） of gastric tissue, and to explore whether the lower he-sea points of stomach have relative specificity in treatment of stomach diseases. Methods Seventy healthy SD rats were randomly divided into seven groups, including control group, model group, ＂Zúsānlǐ＂（足三里 ST 36） group, ＂Shàngjùxū＂（上巨虚 ST 37） group, ＂Xiàjùxū＂（下巨虚 ST 39） group, ＂Yánglíngquán＂（阳陵泉 GB 34） group and ＂Chéngjīn＂（承筋 BL 56） group, with five male rats and five female rats in each group. Acute gastric mucosal lesion model was established by applying WRS method. After successful modeling and treatment for ten days, sampling was conducted, gastric mucosal lesion was observed visually and scored, the levels of serum HMGB 1 and gastric tissue TNF-α were detected by ELISA method, and the expression of NF-κB was detected by immunohistochemical method. Results①Compared with the model group, the levels of Ulcers and inflammation（UI） in gastric mucosal and serum HMGB1, and the expression of gastric tissue TNF-α and NF-κB in the four lower he-sea points groups reduced（P〈0.01 or P〈0.05）;② compared with ST 36 group, the levels of gastric mucosal UI and serum HMGB1, and the expression of gastric mucosal TNF-α and NF-κB in other treatment groups increased significantly, and the difference was statistically significant（P〈0.01 or P〈0.05）. Conclusion①Electroacupuncture at relevant lower he-sea points can inhibit the body＇s immune response, relieve inflammatory reaction and reduce mucosal lesion by regulating HMGB 1, TNF-α and NF-κB, so as to realize the intervention and treatment on AGML rats;② the total intervention effect in ST 36 group is superior to that in other groups, indicating partially that there is a relative specificity between ST 36 and stomach.

Effect of electroacupuncture at Lower He-Sea points including Yanglingquan(GB 34)on nuclear factor-κB and interleukin-1βin guinea pigs with acute cholecystitis

Objective:To observe the effect of electroacupuncture(EA)at Lower He-Sea points on the expression levels of interleukin-1β(IL-1β)in the serum and gallbladder tissues,and nuclear factor-κB(NF-κB)in gallbladder tissues of the guinea pigs with acute cholecystitis(AC),and to explore whether Yanglingquan(GB 34),the Lower He-Sea point pertaining to Dan Fu(gallbladder),is relatively specific for the Dan Fu(gallbladder)disorders.Methods:Eighty-two healthy guinea pigs were randomly divided into 6 groups according to the random number table method,a blank group,a model group,a Yanglingquan(GB 34)group,a Zusanli(ST 36)group,a Shangjuxu(ST 37)group,and a Xiajuxu(ST 39)group,with 12 guinea pigs in the blank group while 14 in the other groups,respectively,half males and half females in each group.Except for the blank group,guinea pigs in the other groups were injected with E.coli into the gallbladder to establish AC models.Guinea pigs in the blank group were fed routinely without special treatment;those in the model group were daily tied up for 30 min without EA treatment;those in the 4 groups receiving EA treatment were acupunctured at the corresponding Lower He-Sea points after daily binding and stimulated with the SDZ-V EA instrument.After successful modeling and treatment for 5 d,blood was collected from the abdominal aorta of the guinea pigs,and the gallbladder tissues in each group were isolated for hematoxylin-eosin(HE)staining to observe the morphological changes.Enzyme-linked immunosorbent assay(ELISA)was used to detect the serum IL-1βlevel,and immunohistochemistry(IHC)was used to detect the expression levels of NF-κB and IL-1βin gallbladder.Results:On the 3rd day after modeling,the guinea pigs in the five groups with modeling were mentally depressed with decreased appetite,significantly reduced activities,slouch,lassitude,slack and matted fur,and loose stools;two guinea pigs were selected from each group(one male and one female,not included in the final statistics)to isolate the gallbladder after sacrifice;macroscopic observation showed that the gallbladder wall was differently thickened;the bile color was dark green and opaque with particles suspended or accumulated;light microscope observation showed that the submucosal blood vessels of the gallbladder were congested,along with mucosal edema,ulceration,necrosis,shedding,and a large number of inflammatory cells infiltrating in the lamina propria,indicating that the AC model was successfully prepared.Compared with the model group,the gallbladder tissue injuries of the four groups receiving EA treatment were all differently repaired,the serum IL-1βlevels were reduced(P<0.01 or P<0.05),and the IL-1βlevels in the gallbladder tissues were reduced(P<0.01 or P<0.05).Compared with the model group,the NF-κB expression level in the Yanglingquan(GB 34)group was significantly reduced(P<0.01),but was not statistical different in the Zusanli(ST 36)group,Shangjuxu(ST 37)group and Xiajuxu(ST 39)group(all P>0.05).Compared with the Yanglingquan(GB 34)group,the gallbladder tissues of the Zusanli(ST 36)group,Shangjuxu(ST 37)group and Xiajuxu(ST 39)group were more severely damaged,and the expression levels of serum IL-1β,the NF-κB and IL-1βin the gallbladder tissues were increased(P<0.01 or P<0.05).Intervention effect of Yanglingquan(GB 34)on AC guinea pigs was superior to that of Zusanli(ST 36),Shangjuxu(ST 37)and Xiajuxu(ST 39).Conclusion:EA at the Lower He-Sea points of the stomach,large intestine,small intestine and gallbladder can produce curative effects on AC guinea pigs and reduced the inflammatory symptoms.Intervention effect of Yanglingquan(GB 34)on AC guinea pigs is superior to that of Zusanli(ST 36),Shangjuxu(ST 37)and Xiajuxu(ST 39).The mechanism of EA at Yanglingquan(GB 34)in treating AC may be regulating IL-1βand NF-κB to control the inflammatory response and improve the gallbladder tissue damage.

Almost Fixed Points and Fixed Points of Upper [Lower] Semicontinuous Multimap on Locally G-convex Spaces

In this paper, we use the well known KKM type theorem for generalized convex spaces due to Park （Elements of the KKM theory for generalized convex spaces, Korean J. Comp. Appl. Math., 7（2000）, 1-28） to obtain an almost fixed point theorem for upper [resp., lower] semicontinuous multimaps in locally G-convex spaces, and then give a fixed point theorem for upper semicontinuous multimap with closed Γ-convex values.

Lower rotating point nutrient vessels of sural nerve flap with distant pedicled repairing soft tissue defect of foot and ankle

To explore lower rotating potint nutrient vessels of sural nerve flap with distant pedicled repairing the soft tissue defect of foot and ankle.Methods Lay a foundation of anatomic studying from february 2003 to March 2004,using lower rotating point nutrient vessels of sural nerve flap with distant pedicled repairing the soft tissue defect of foot and ankle in 11 cases.Cause of injuring:traffic accident 7 cases,crushing 1 case,saw injury 1 case,skin cancer 1 case,chronic ulcer 1 case.Areas:foot heel 6 cases,shank lower section 2 cases,heel tendon 2 cases,the distant back of the foot 1 case.Using the flap axis point was 1～3 cm above the pin of the external heel,average 2 cm.The scope of the flap was 6.0 cm×8.0 cm～12.0 cm～18.0 cm.Results All sural nerve flaps were alive.Of them,2 cases have distant part necrosis,accompanying with subcutaneous tissue,1 case heels after change dressings,another heels after skin grafting.All case can walk as usual,the flap was wear-resisting and keenly feel.Conclusion Lower rotating point nutrient vessels of sural nerve flap,donner area was fine,available area was large,skin in the pink,easy grafting,without main blood vessel damage,survival rate high,it is a good donner area in repairing around heel,foot and shank lower section.7 refs,1 tab.

基于检测框下边沿的单目视觉车辆测距研究

对车辆测距是当今驾驶领域的热门研究方向。针对传统测距方法测距精度受到车型大小影响的问题以及前车存在的X轴偏移问题,提出了基于检测框下边沿中心点的车辆测距模型。该模型通过使用单目视觉摄像头及车辆检测算法获取前方车辆的位置信息,并通过车辆检测框得出的下边沿中心点坐标,以及相机安装的俯仰角信息综合建立了车辆测距模型,解决了车型大小带来的误差问题;通过构建三角函数模型,解决了前车相对于实验车辆存在的X轴分量问题,并优化改进了前车安全距离的判定方式;设定车尾矩形框中心点横坐标与车辆外接矩形框宽度的比值λ,根据λ取值分情况讨论,使该模型更符合场景应用需要。并提出了基于测距关键点的逆透视变换模型,减小了测距误差。实验表明,改进后测距模型的测距精度不受车型大小的影响且能考虑到前车位置的X轴分量问题,改进后的测距模型相对于传统测距模型,测距误差降低了约1.5%,且测距精度明显提高。

动态四点跪位训练对脊髓损伤患者髋关节骨密度及下肢运动功能的影响

目的:探讨脊髓损伤患者进行动态四点跪位训练对髋关节骨密度及下肢运动功能的影响。方法:采用前瞻性随机对照研究方法,选取2019年1月至2022年1月收治的80例脊髓损伤患者,采用随机数字表法分为对照组与观察组各40例,对照组采用常规康复训练+直立床训练,观察组采用常规康复训练+动态四点跪位训练,两组均连续干预12周。干预前及干预4周、8周、12周时,分别记录髋关节骨密度、下肢臀大肌及腘绳肌肌电信号、感觉评分、下肢运动功能评分(LEMS),股四头肌、臀大肌及腘绳肌的肌张力(改良Ashworth分级)和肌力,并统计两组不良事件(体位性低血压、膝关节疼痛、摩擦伤、跌倒)发生情况。结果:干预4周、8周、12周时,两组髋关节骨密度T-值均低于干预前,观察组高于对照组(P<0.05);干预4周、8周、12周时,两组表面肌电信号积分肌电值及LEMS均高于干预前,且观察组高于对照组(P<0.05);干预前及干预4周、8周、12周时,两组感觉评分差异无统计学意义(P>0.05);干预4周、8周、12周时,观察组肌张力低于对照组(P<0.05),肌力高于对照组(P<0.05);两组不良事件发生率比较差异无统计学意义(P>0.05)。结论:动态四点跪位训练可以在部分负重下通过动态训练刺激髋关节周围肌肉收缩以延缓脊髓损伤患者髋关节骨量流失,改善损伤平面以下下肢运动功能,且安全性较好。

极限下限分析的区域光滑径向点插值法

极限分析的高效数值计算方法在结构设计和安全评定中具有非常重要的作用.为了更加有效地求解极限分析问题,将区域光滑径向点插值法与二阶锥规划相结合,提出了理想弹塑性结构极限下限分析的一种新方法.将问题域离散为简单的三角形背景单元,每个单元进一步划分成若干个光滑域.为了将复杂的域积分转化为简单的边界积分,并且避免计算形函数的导数,采用广义梯度光滑技术对每个光滑域进行应变光滑处理.由于径向点插值法构造的形函数满足Kronecker delta性质,本质边界条件可以直接施加.依据下限定理,在满足以等效积分弱形式表达的自平衡应力场平衡条件的基础上,用二阶锥规划成功构建了极限分析下限法的计算模型,从而可方便地通过基于原始-对偶内点法的数学规划求解器MOSEK直接求解该问题.数值算例结果表明,本文所提方法有效地克服了维数障碍问题,具有较高的计算精度,并且计算结果对网格畸变十分不敏感.

固体激光器可靠性评估技术研究

主要介绍了在获得固体激光器的失效数据下,利用AIC、BIC信息量最小准则的分布类型选择方法,确定固体激光器的失效分布类型,再利用已有的数据,对其可靠性进行有效的评估,得到固体激光器MTBF的点估计和不同置信度下的MTBF置信下限,为该产品设计定型和生产决策提供管理信息。

三层正放四角锥预应力网架稳定性分析

网架以其优良的工程性能成为大跨度结构的首选结构类型之一。为改善传统网架结构在大跨度条件下变形大、用钢量大的缺陷,文中通过对网架施加预应力的方式,达到增强结构整体刚度和承载能力的目的。预应力的施加必然会对网架的稳定性能造成影响,其中支承形式对网架结构的稳定性影响较大。并通过对网架施加不同预应力后进行稳定性分析,得到不同预应力布索方式对网架稳定性影响,为网架的实际工程建设提供参考。

《黄帝内经》不同语境下“三焦”涵义考

《黄帝内经》中“三焦”一词见于22篇计40处,其中29处意义明确,历代注解无异义;4处有不同观点;另有存在校勘问题者4处;尚有三焦理、三焦下腧、三焦之源3个衍生名词。在不同语境下,29处意义明确的“三焦”分别指三焦腑、手少阳三焦经、上中下三焦,并无争议,只要在阅读过程中仔细分辨,就能够明确其所指。有争议处,为咳论篇之“三焦受之”“三焦咳”、四时气之“三焦约”、经别之“下走三焦”。4处“三焦”存在校勘问题,即“三焦”与“足三焦”、“三焦”与“上焦”(2次)、“三焦”与“三椎”。三焦理、三焦下腧、三焦之源3个衍生名词均与三焦理论有关。

下刚果盆地早白垩世Pointe Indienne组湖相浊积岩特征及石油地质意义

为了明确下刚果盆地盐下重点勘探层系,采用沉积学、石油地质学的相关理论和方法,结合区域地质背景、钻测井数据和分析测试结果等资料,对下刚果盆地早白垩世Pointe Indienne组湖相浊积岩特征及其石油地质意义进行了探讨,并建立了Pointe Indienne组大型浊积扇的发育模式。结果表明:该浊积岩形成于深湖相沉积环境,其叠置砂体具有典型的浊流沉积特征,发育典型的鲍玛序列及特征沉积构造;该浊积砂岩为长石岩屑质石英砂岩或杂砂岩,其成分成熟度低、结构成熟度较差,表现为快速堆积的重力流沉积特征;该浊积砂岩内部识别出了多套完整和不完整的鲍玛序列,显示了厚层块状浊积岩和薄层或微层浊积岩的组合形式,指示了浊积扇内扇、中扇、外扇的沉积特征;该浊积砂岩为中孔低渗储层,与Pointe Indienne组上段和下段发育的厚层优质烃源岩接触,具有良好的生、储、盖组合,是下刚果盆地盐下油气勘探的重点层系。

电针步行核心肌肉运动点对亚急性期脑卒中患者下肢运动功能重建的影响

目的:观察电针步行核心肌肉运动点对亚急性期脑卒中患者下肢运动功能重建的影响。方法:选取符合纳入标准的脑卒中下肢运动功能障碍患者60例作为研究对象,根据Stata/SE 16.0生成的随机数序列,将患者随机分为两组,均给予中风病常规治疗。此外,对照组给予环跳、阳陵泉、阴陵泉、风市、足三里及太冲电针治疗,试验组给予股内侧肌、股外侧肌、胫骨前肌、腓骨长肌、股二头肌、半腱肌、腓肠内侧肌及比目鱼肌步行核心肌肉运动点电针治疗。治疗前后采用徒手肌力评定(MMT)测量下肢肌力、Holden步行功能分级量表(FAC)评定步行功能、改良Barthel量表(MBI)评定患者日常生活活动能力和表面肌电信号均方根值(RMS)评定肌肉实时收缩情况并对比两组治疗后的临床疗效。结果:两组患者MMT评分、FAC评分、MBI评分及RMS值治疗后分值均升高,治疗后两组患者MMT评分、FAC评分、MBI评分及RMS值组间比较,差异有统计学意义(P<0.05),且试验组总有效率为93.33%(28/30),优于对照组的70%(21/30)。结论:电针步行核心肌肉运动点能改善亚急性期脑卒中患者的下肢肌力、步行能力和日常生活活动能力,临床疗效明确。

湖相重力流沉积特征及沉积模式——以下刚果盆地A区块白垩系Pointe Indienne组为例

应用深水沉积学和地震沉积学的相关理论,通过岩心观察描述、钻测井资料分析及平面沉积相编图,对下刚果盆地A区块白垩系Pointe Indienne组深水重力流的类型、沉积特征、垂向沉积组合及沉积模式进行了探讨分析,指出该地区发育砂质碎屑流、泥质碎屑流、浊流及与重力流形成过程相关的滑动—滑塌沉积,并总结了该深水重力流的沉积模式。结果表明:砂质碎屑流沉积以块状层理细砂岩为主,含大型漂浮泥砾和泥岩撕裂屑;泥质碎屑流沉积以泥级碎屑为主,含有少量的暗色泥岩碎屑和砂质团块,见"泥包砾"结构;浊流沉积以发育完整或不完整的鲍马序列为特征;滑动—滑塌沉积具有明显的剪切滑移面,可见旋转火焰构造、砂岩扭曲杂乱分布及褶皱变形层;纵向上可识别出4种类型的重力流沉积垂向组合,以多期砂质碎屑流沉积叠置和砂质碎屑流沉积与浊流沉积叠置最为常见;研究区深水重力流沉积可分为上部扇、中部扇和外部扇3部分,上部扇以主水道沉积为主;中部扇以辫状水道和溢岸沉积为主,砂体厚度较大;外部扇以朵叶体沉积和薄层浊积岩为主,砂体厚度相对较薄。

Monaco放疗计划系统控制点设定对中下段食管癌动态调强放射治疗计划剂量学的影响

目的:研究Monaco放射治疗计划系统中控制点(CP)不同取值对中下段食管癌动态调强放疗(dIMRT)计划的剂量学影响。方法:选取2023年1-6月在商洛市中心医院接受动态调强放疗的13例中下段食管癌患者,在Monaco放疗计划系统中对每例患者分别以CP限值为10、20、30、40、50、60、80、130和200设计9组dIMRT计划,除CP参数外其他优化参数均保持不变,分析靶区和危及器官(OAR)肺部、心脏和脊髓的剂量差异。结果:随着CP限值的增大,靶区最大剂量即2%靶区体积的受照剂量(D_(2%))、平均剂量即50%靶区体积的受照剂量(D_(50%))和剂量均匀性指数(HI)呈先减小然后趋于平稳;靶区最小剂量即98%靶区体积的受照剂量(D_(98%))和靶区适形度指数(CI)呈先增大然后趋于平稳;OAR的各剂量指标差异均无统计学意义(P>0.05);肺部5、10、20、30Gy剂量的体积百分比(V_(5)、V_(10)、V_(20)、V_(30))变化范围分别为1.13%、0.75%、0.29%和0.19%,肺部平均剂量(V_(mean))最大偏差18.7 cGy;心脏V_(10)、V_(20)、V_(30)、V_(40)变化范围分别为2.2%、1.23%、1.39%和1.12%,心脏V_(mean)最大偏差63.85 cGy,脊髓D_(max)最大偏差70.78 cGy.9组计划实际控制点个数(CP_(s))、计划执行时间(DT)、计划复杂度机器跳数与实际控制点个数比值(MU/CP_(s))比较,差异具有统计学意义(F=2.857、25.145、135.467,P<0.05)。结论:在中下段食管癌dIMRT计划中,最大CP值设定为40~50,在满足靶区和OAR剂量的前提下能够减少计划的优化时间、子野数目和患者的治疗时间。

A Review on Flow Boiling of the Fluid with Lower Boiling Point in Micro-Channels

With the advancement of micro machining technology,the high-heat-flux removal from miniature electronic devices and components has become an attractive topic.Flow boiling in micro-channels is an optimal form of heat transfer and has been widely employed in high-heat-flux cooling applications.This comprehensively-reviewed article focused on the available recent literatures of experimental investigation regarding the flow boiling heat transfer and unstable behaviors of the fluid with lower boiling point in micro-channels.The thermal-fluid characteristics and potential heat transfer mechanisms of low-boiling-point fluids flow boiling in different narrow passages were summarized and discussed.The literatures regarding the pressure drop and occurrence of the unstable phenomena existing in two-phase flow boiling process were also discussed.The emphasis was given to the heat transfer enhancement methods as well as instability elimination,and various methods such as modification of surface and channel flow geometries were considered.Some future researches in the field of micro-scale flow boiling were suggested.

激痛点火针疗法对腰背肌筋膜炎患者疼痛的影响

目的观察激痛点火针疗法对腰背肌筋膜炎患者疼痛的影响。方法选取2021年3月—2023年3月在福建中医药大学附属三明市中西医结合医院康复科就诊的腰背肌筋膜炎患者65例,按随机数字表法分为对照组(n=32)与观察组(n=33)。对照组采用常规针刺治疗,观察组采用针刺联合激痛点火针疗法。6周后评估2组患者疼痛评分、腰椎功能评分,观察腰背部红外成像结果。结果观察组患者视觉模拟评分法(visual analog scale,VAS)评分[(3.76±1.08)分vs.(5.28±1.55)分],Oswestry功能障碍指数问卷(Oswestry disability index,ODI)评分[(13.76±3.42)分vs.(11.50±4.58)分]及腰背部红外成像的平均温度[(30.21±3.03)℃vs.(33.31±3.16)℃]均显著低于对照组,差异有统计学意义(P<0.05)。结论针刺联合激痛点火针疗法可以有效缓解腰背肌筋膜炎患者疼痛,改善腰椎功能障碍。

长江中下游粮食主产区耕地面源污染时空分异特征

为揭示长江中下游粮食主产区耕地面源污染时空规律,利用长江中下游粮食主产区58个市(州、区)统计数据,采用空间分析模型、重心模型、冷热点分析等方法分析了2009—2019年长江中下游粮食主产区耕地面源污染时空分异特征。结果表明:长江中下游流域整体以及赣湘鄂皖4省2009—2019年耕地面源污染总量和强度总体均呈现出“先升后降”的变化趋势,其中湖北省的耕地面源污染强度与总量均位于前列。2009—2019年耕地面源污染强度总体表现为“西高东低”的空间分布特征,其中江西省整体上一直保持为低污染强度,湖北省则为高污染强度聚集区。长江中下游粮食主产区耕地面源污染强度重心变化呈现出“区间震荡”的规律,且长江中下游粮食主产区耕地面源污染强度重心迁移呈现明显的阶段特征。2009—2019年长江中下游粮食主产区耕地面源污染强度呈现出明显的空间聚集态势,总体表现为“东冷西热”的空间分布格局。因此,长江流域中游段特别是湖北省和湖南省是未来进一步推进耕地面源污染防治的重点区域,要统筹好国家粮食安全和耕地生态安全双重目标。

捕食-食饵系统在气候变化下强迫波的存在性

捕食-食饵系统是一种描述种群之间相互作用的数学模型,在维护生态平衡方面发挥着重要作用。研究了在气候变化环境下的一类三物种捕食-食饵系统,通过构造合适的上下解并结合Schauder不动点定理,得到了强迫波的存在性。

基于卷积神经网络的X线片下肢关节角度识别算法

提出一种基于卷积神经网络的X线片下肢关节角度识别算法,首先在X线片中使用Yolov5目标检测模型来识别特定类别的感兴趣区域,并使用U-Net模型进行热图回归来识别关键特征点,最后进行下肢关节角度的计算。研究结果表明,本文提出的算法相比于之前的算法精度更高,结果准确可靠,为临床研究和实践提供参考。