微血管血流成像与二维立体血流成像技术鉴别诊断妊娠子宫局限性收缩与子宫肌瘤的应用价值

目的探讨微血管血流(MV-Flow)成像、二维立体血流(LumiFlow)成像在鉴别妊娠早期子宫局限性收缩与子宫肌瘤中的应用价值。方法选取2021年8月至2022年12月本院利用MV-Flow与LumiFlow技术鉴别诊断的60例早孕期子宫肌瘤和子宫收缩孕妇作为研究对象,其中子宫肌瘤24例,子宫收缩36例,观察二者的回声及边界。分析MV-Flow与LumiFlow技术观察其内血流、分布、走行等对子宫肌瘤与子宫局限性收缩。结果子宫肌瘤与子宫收缩患者二维灰阶成像对子宫壁稍低回声比较差异无统计学意义;子宫肌瘤患者等回声、均匀回声、边界不清占比低于子宫收缩患者,差异有统计学意义(P<0.05)。子宫肌瘤与子宫收缩患者在MV-Flow与LumiFlow成像血管分级<50%、100%~150%、150%~200%区间的乏血供区间比较差异有统计学意义(P<0.05),但合并100%~200%区间时,子宫肌瘤与子宫收缩血流比较差异无统计学意义。子宫肌瘤患者血流走行与子宫壁垂直,间距均匀、内部血流走行自然,分布均匀占比低于子宫收缩患者,环状血流(或血流绕行)、内血流呈火球样,走行扭曲占比均高于子宫收缩患者,差异有统计学意义(P<0.05)。子宫收缩患者有丰富血流进入胎盘占比高于子宫肌瘤患者,差异有统计学意义(P<0.05)。结论MV-Flow与LumiFlow技术能清晰显示子宫肌瘤、子宫局限性收缩内的超低血流信号,子宫肌瘤的血管绕行显示率高,具有确诊价值;垂直于子宫壁的梳状血流及有丰富进入胎盘内的血流对子宫收缩具有确诊价值,该技术能简便、快捷、精确的鉴别诊断早孕期子宫肌瘤与子宫局限性收缩。

胃助显剂充盈超声检查声像图特征对胃囊肿的诊断价值

目的探讨胃助显剂充盈超声检查声像图特征对胃囊肿的诊断价值。方法回顾性分析2012年6月至2021年12月于莲花县人民医院行胃助显剂充盈超声检查且经外院手术、内镜超声或CT增强确诊的12例胃囊肿及28例胃实质性占位性病灶患者的临床资料。12例胃囊肿患者纳入诊断组,28例胃实质性占位性病灶患者纳入对照组,均行胃助显剂充盈超声检查,比较两组超声影像特征。结果诊断组包膜纤细清晰、与胃壁呈钝角、形态呈椭圆形、后方回声增强比例均高于对照组,差异有统计学意义(P<0.05)。诊断组无血流信号、体位形态改变比例均略高于对照组,但组间比较差异无统计学意义。结论胃助显剂充盈超声检查声像图特征能有效诊断胃囊肿,并可与胃实质性占位性病灶鉴别,适合在基层医院广泛推广。

珠海二手房价格空间分布趋势及港珠澳大桥通车空间相关性分析

港珠澳大桥是世界最长的跨海大桥。为了论证二手房价格与大桥通车时空效应的相关关系,以及大桥通车对二手房价格的影响程度和持续时间,引入百度指数,通过Moran's I指数分析珠海房价的空间自相关性,再通过ESDA探索性空间数据分析法检查空间数据趋势,最后通过逐步回归普通最小二乘法和显著性分析,筛选出相关变量,使用皮尔森相关性矩阵和随机森林模型依次进行相关性和重要性分析。研究发现:①珠海市二手房房价空间分布趋势以东西向差异为主,自西向东房价逐渐升高,南北向无明显差异;②百度指数显著性得分在通车前逐渐提高,通车后迅速下降,随机森林重要性得分高于其他类型变量,能反映居民对于大桥通车对二手房价格的变化预期,在短期房价变化研究中有较好表现;③港珠澳大桥通车时空变量与二手房价格相关性得分随着通车时间的临近而大幅升高,距离港珠澳大桥越近的二手房,其价格受到大桥通车的影响越显著;④大桥通车对房价的影响范围在3 km左右,3 km内房价在短期内呈显著上涨趋势,其趋势与连通点距离呈负相关关系,而3 km外房价在短期内无明显变化。

Magnetoplasmon-Polariton Modes of Finite Cantor-Type Heterostructures

By using local theory and taking into account retardation,we investigate the plasmonpolariton modes of a finite Cantor-type heterostructures which are composed of two alternating materials with their thicknesses following Cantor sequence.The effects of an external magnetic field applied parallel to the interfaces are considered.We find that the modes have fractal structure due to the special geometry of the system,and the dispersion relations of the modes are strikingly modified by the external magnetic field.Some new modes appear because of the application of the field.By plotting the profiles of the amplitudes of the electric field,we also investigate the localization properties of the modes.

有机磷农药中毒患者实施护理心理干预的临床效果

目的探讨有机磷农药中毒患者实施护理心理干预的临床效果。方法选取我院2016年5月至2019年12月收治的44例不同程度的有机磷农药中毒患者为研究对象,随机分为对照组(n=22,实施常规护理)和干预组(n=22,在对照组的基础上采取心理护理干预)。比较两组患者的治疗依从性、胆碱酯酶活性恢复时间、住院时间和焦虑、抑郁发生率。结果干预组治疗依从率(95.45%)显著高于对照组(77.27%),胆碱酯酶活性恢复时间及住院时间显著少于对照组,焦虑、抑郁的发生率显著低于对照组,两组比较差异显著(P<0.05)。结论有机磷农药中毒患者实施心理护理干预,患者的胆碱酯酶活性复原时间、住院时间、治疗依从率、焦虑抑郁的发生率均起到缩短或降低作用,有利于患者的心理健康,对患者社会生活的自信心建立有明显的帮助作用。

雅鲁藏布江干流山南森布日段防洪工程护坡施工要点浅析

雅鲁藏布江干流山南森布日段防洪工程通过对森布日段新建堤防措施,提高保护区防洪标准,达到保护人口、财产、耕地、河道安全行洪等目的。近些年,护坡工程的建设在水土流失的控制方面发挥了显著的成效。以堤防为主,堤路结合的护坡形式,兼有防止水土流失和促进经济发展等综合作用,在雅鲁藏布江干流山南森布日段防洪工程中得到了良好地应用,文章重点对其护坡施工技术要点进行简要分析。

Tunable multiple-channel filters based on photonic heterostructures using single-negative materials

We studied the multiple-channel filters based on photonic heterostructures consisting of single-negative permittivity and single-negative permeability media. The results showed that the number of resonance modes inside the zero-φeff gap increases as the number of heterogenous interface M increases. The number of resonance modes inside the zero-φeff gap is equal to that of heterogenous interface M, and it can be used as M channels filter. This result provides a feasible method to adjust the channel number of multiple-channel filters. When losses are involved, the results showed that the electric fields of the resonance modes decay largely with the increase of the number of heterogenous interface and damping factors. Besides, the relationship between the quality factor of multiple-channel filters and the number of heterogenous interface M is linear, and the quality factor of multiple-channel filters decreases with the increase of the damping factor. These results provide feasible methods to adjust the quality factor of multiple-channel filters.

A Theoretical Analysis of Torque and Superlubric Motion in Bilayer Graphene Disks

To identify the relation between torque and superlubric motion, we investigate the interlayer sliding behavior of two graphene disks with numerical computation methods. The potential energy, lateral force and torque between the top and bottom graphene disks, which are associated with misfit angle, translational displacement and interlayer distance, are analyzed. The results show that the rotation of the top disk is feeble for commensurate state, but it is difficult to realize superlubricity due to the lateral force fluctuating remarkably. For incommensurate state, the flake exhibits vanishing torque approaching to zero only for partial sliding directions. The superlubricity between the top and bottom disks will be eliminated due to torque-induced reorientation along other sliding directions. Whether for commensurate or incommensurate contact, the amplitudes of the lateral force （516 pN and 13 pN, respectively） are in qualitative agreement with experimental observation （typically 250 pN and 50 pN, respectively）. It shows that the interlayer torque is insensitive to the top disk size with incommensurate contact. The results suggest that the superlubric motion of graphene disk can be controlled by adjusting the torque.