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Appendiceal intussusception complicated by adenocarcinoma of the cecum:A case report

World Journal of Clinical Cases 2024年第8期12卷 1461-1466页

作者： Yu Long Yi-ning xiang Fei Huang Lei Xu Xiao-Yun Li Yun-Huan Zhen Department of Colorectal Surgery The Affiliated Hospital of Guizhou Medical UniversityGuiyang 550001Guzihou ProvinceChina Department of Colorectal Surgery Guizhou Medical UniversityGuiyang 550001Guizhou ProvinceChina Department of Pathology The Affiliated Hospital of Guizhou Medical UniversityGuiyang 550001Guizhou ProvinceChina

BACKGROUND Appendiceal intussusception is a pathological condition in which the appendix is inverted into the cecum,which may cause symptoms that resemble those of other gastrointestinal disorders and may induce intestinal obstruction.The rarity of this case presentation is the co-occurrence of appendiceal intussusception and cecal adenocarcinoma,a combination that to our knowledge has not previously been reported in the medical literature.This case provides new insights into the complexities of diagnosing and managing overlapping pathologies.CASE SUMMARY A 25-year-old woman presented with persistent periumbilical pain and bloody stools.An initial biopsy showed cecal cancer;however,subsequent colonoscopy and computed tomography findings raised the suspicion of appendiceal intussus-ception,which was later confirmed postoperatively.This unique case was charac-terized by a combination of intussusception and adenocarcinoma of the cecum.The intervention included a laparoscopic right hemicolectomy,which led to the histopathological diagnosis of mucinous adenocarcinoma with appendiceal intussusception.The patient recovered well postoperatively and was advised to initiate adjuvant chemotherapy.This case highlights not only the importance of considering appendiceal intussusception in the differential diagnosis,but also the possibility of appendicitis and the atypical presentation of neoplastic lesions.CONCLUSIONS Physicians should consider the possibility of appendiceal intussusception in cases of atypical appendicitis,particularly when associated with neoplastic presentation.

关键词： Appendiceal intussusception Appendicitis Cecal cancer Target signs Misdiagnosis Case report

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One-year results for myopia control of orthokeratology with different back optic zone diameters: a randomized trial using a novel multispectral-based topographer

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International Journal of Ophthalmology(English edition) 2024年第2期17卷 324-330页

作者： Wen-Ting Tang xiang-ning Luo Wen-Jing Zhao Jia Liao Xin-Yue Xu Hui-Dan Zhang Li Zhang Department of Ophthalmology the First Affiliated Hospital of Chengdu Medical CollegeChengdu Medical CollegeChengdu 610500Sichuan ProvinceChina

AIM:To present the 1-year results of a prospective cohort study investigating the efficacy,potential mechanism,and safety of orthokeratology(ortho-k)with different back optic zone diameters(BOZD)for myopia control in children.METHODS:This randomized clinical study was performed between Dec.2020 and Dec.2021.Participants were randomly assigned to three groups wearing ortho-k:5 mm BOZD(5-MM group),5.5 mm BOZD(5.5-MM group),and 6 mm BOZD(6-MM group).The 1-year data were recorded,including axial length,relative peripheral refraction(RPR,measured by multispectral refractive topography,MRT),and visual quality.The contrast sensitivity(CS)was evaluated by CSV-1000 instrument with spatial frequencies of 3,6,12,and 18 cycles/degree(c/d);the corneal higher-order aberrations(HOAs)were measured by iTrace aberration analyzer.The one-way ANOVA was performed to assess the differences between the three groups.The correlation between the change in AL and RPR was calculated by Pearson’s correlation coefficient.RESULTS:The 1-year results of 20,21,and 21 subjects in the 5-MM,5.5-MM,and 6-MM groups,respectively,were presented.There were no statistical differences in baseline age,sex,or ocular parameters between the three groups(all P>0.05).At the 1-year visit,the 5-MM group had lower axial elongation than the 6-MM group(0.07±0.09 vs 0.18±0.11 mm,P=0.001).The 5-MM group had more myopic total RPR(TRPR,P=0.014),with RPR in the 15°–30°(RPR 15–30,P=0.015),30°–45°(RPR 30–45,P=0.011),temporal(RPR-T,P=0.008),and nasal area(RPR-N,P<0.001)than the 6-MM group.RPR 15–30 in the 5.5-MM group was more myopic than that in the 6-MM group(P=0.002),and RPR-N in the 5-MM group was more myopic than that in the 5.5-MM group(P<0.001).There were positive correlations between the axial elongation and the change in TRPR(r=0.756,P<0.001),RPR 15–30(r=0.364,P=0.004),RPR 30–45(r=0.306,P=0.016),and RPR-N(r=0.253,P=0.047).The CS decreased at 3 c/d(P<0.001),and the corneal HOAs increased in the 5-MM group(P=0.030).CONCLUSION:Ortho-k with 5 mm BOZD can control myopia

关键词： relative peripheral refraction orthokeratology myopia back optic zone diameter axial length multispectral refractive topography

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Modeling flow stress and grain size of GCr15 bearing steel at hightemperature deformation near end of solidification

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Journal of Iron and Steel Research(International) 2023年第1期30卷 88-101页

作者： Rui-hao Li Hai-jun Li ning xiang Guo-dong Wang Li-juan Bai The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina HBIS Group Technology Research Institute Shijiazhuang 050000HebeiChina

Hot-core heavy reduction rolling is an innovative technology for continuous casting billet at the end of solidification.The deformation characteristics of GCr15 bearing billet were investigated over the temperature range of 1000-1300℃ with the strain rate of 0.001-10 s^(-1) by the Gleeble 3800 thermo-mechanical simulator.Firstly,the true stress-strain data are calibrated by the friction correction method to acquire accurate parameters near the solidus.Then,the Laasraoui-type constitutive model and dynamic austenite grain size model are established by the thermal compression results and corrosion experimental results,and the predicted values of the experimental interval are obtained by using the models.Meanwhile,the accuracy of models is verified by comparing the predicted curves with the experimental data.Last but not the least,the dynamic parameters between solidus and liquidus are predicted by the two models,and the difficulty of experimental collecting near the melting point is solved.

关键词： Hot-core heavy reduction rolling High-temperature deformation GCr15 bearing billet Dynamic recrystallization Dynamic grain model

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Signature of Superconductivity in Pressurized La_(4)Ni_(3)O_(10)

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Chinese Physics Letters 2024年第1期41卷 77-84页

作者：李庆张英杰项浙宁张宇航祝熙宇闻海虎 National Laboratory of Solid State Microstructures and Department of Physics Center for Superconducting Physics and MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

The discovery of high-temperature superconductivity near 80K in bilayer nickelate La_(3)Ni_(2)O_(7)under high pressures has renewed the exploration of superconducting nickelate in bulk materials.The extension of superconductivity in other nickelates in a broader family is also essential.Here,we report the experimental observation of superconducting signature in trilayer nickelate La_(4)Ni_(3)O_(10)under high pressures.By using a modified solgel method and post-annealing treatment under high oxygen pressure,we successfully obtained polycrystalline La_(4)Ni_(3)O_(10)samples with different transport behaviors at ambient pressure.Then we performed high-pressure electrical resistance measurements on these samples in a diamond-anvil-cell apparatus.Surprisingly,the signature of possible superconducting transition with a maximum transition temperature(T_(c))of about 20K under high pressures is observed,as evidenced by a clear drop of resistance and the suppression of resistance drops under magnetic fields.Although the resistance drop is sample-dependent and relatively small,it appears in all of our measured samples.We argue that the observed superconducting signal is most likely to originate from the main phase of La_(4)Ni_(3)O_(10).Our findings will motivate the exploration of superconductivity in a broader family of nickelates and shed light on the understanding of the underlying mechanisms of high-T_(c) superconductivity in nickelates.

关键词： materials superconductivity signature

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预处理方法对定向有机玻璃表面性能及黏结强度影响

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材料工程 2024年第5期52卷 156-162页

作者：齐梦雨相宁张晓雯颜悦郑梦瑶中国航发北京航空材料研究院北京市先进运载系统结构透明件工程技术研究中心北京100095

为研究不同表面预处理方法对定向有机玻璃表面性能以及与热塑性聚氨酯(TPU)间黏结强度的影响规律及机理,使用AFM、FTIR和接触角测量仪测定酸处理、等离子处理和过渡层处理后定向有机玻璃的表面化学组成、粗糙度与表面接触角,并使用90°... 详细信息

为研究不同表面预处理方法对定向有机玻璃表面性能以及与热塑性聚氨酯(TPU)间黏结强度的影响规律及机理,使用AFM、FTIR和接触角测量仪测定酸处理、等离子处理和过渡层处理后定向有机玻璃的表面化学组成、粗糙度与表面接触角,并使用90°剥离实验测试预处理前后定向有机玻璃与TPU之间的黏结强度。结果表明:酸处理和等离子处理后定向有机玻璃表面粗糙度和表面极性增加,同时表面润湿性能得到改善,使黏结强度分别上升了14%和22%;而过渡层预处理提高了基材与TPU的化学相容性,处理后定向有机玻璃表面极性与TPU相近,降低了界面张力,明显改善界面黏结性能,黏结强度由4.44 kN/m上升至23.61 kN/m。

关键词：定向有机玻璃热塑性聚氨酯黏结机理表面性能

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日本落叶松LkF3H2基因克隆及调控类黄酮代谢功能研究

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生物技术通报 2024年第2期40卷 245-252页

作者：李灿蒋湘宁盖颖林木遗传育种全国重点实验室北京林业大学生物科学与技术学院北京100083 树木花卉育种生物工程国家林业和草原局重点实验室北京100083

【目的】日本落叶松黄烷酮3-羟化酶(flavanone 3-hydroxylase 2,LkF3H2)基因在类黄酮生物合成过程中发挥着重要的调控功能。探究LkF3H2基因在日本落叶松中发挥的具体功能和植物类黄酮生物代谢过程。【方法】根据实验室前期转录组数据克... 详细信息

【目的】日本落叶松黄烷酮3-羟化酶(flavanone 3-hydroxylase 2,LkF3H2)基因在类黄酮生物合成过程中发挥着重要的调控功能。探究LkF3H2基因在日本落叶松中发挥的具体功能和植物类黄酮生物代谢过程。【方法】根据实验室前期转录组数据克隆日本落叶松LkF3H2基因并进行生物信息学分析及组织表达分析。随后将该基因转化烟草进行转基因烟草组织表达分析及类黄酮含量测定,以探究基因表达量与类黄酮含量之间的关系。【结果】LkF3H2基因cDNA序列长度为1074 bp,其蛋白编码358个氨基酸,分子式C_(1785)H_(2807)N_(481)O_(541)S_(18),分子量为40.24 kD,该蛋白是不稳定的亲水性蛋白且不含信号肽;同时系统进化分析得出日本落叶松LkF3H2与火炬松、辐射松、白云杉和欧洲云杉F3H亲缘关系较近并且该蛋白含有保守结构域2OG-Fe(Ⅱ)oxygenase superfamily,属于2-酮戊二酸依赖性双加氧家族。另外组织表达分析显示LkF3H2基因在一月龄日本落叶松幼苗叶中表达量最高,在一年生日本落叶松幼苗茎中表达量最高,并且在转基因烟草叶中也显示了最高的表达量。值得一提的是,转基因烟草叶中的类黄酮含量也是最高的,其次为茎和根,转基因烟草中类黄酮含量与LkF3H2基因表达量呈正相关关系。【结论】日本落叶松LkF3H2基因属于2-酮戊二酸依赖性双加氧家族并且在类黄酮生物合成过程中发挥着重要功能。

关键词：黄烷酮3-羟化酶基因转基因烟草组织表达类黄酮

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热芯大压下轧制大方坯内部孔洞压合及表面裂纹分析

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轧钢 2024年第2期41卷 36-43页

作者：项宁李海军宁新禹李睿昊东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110819

采用热芯大压下工艺可以消除大方坯芯部疏松、缩孔缺陷,然而大方坯应力状态复杂多变,符合大压下变形过程的断裂判据匮乏,制约了热芯大压下工艺的工业化应用。以GCr15大方坯为研究对象,通过设计异形压缩试样获取材料变形时不同的应力状... 详细信息

采用热芯大压下工艺可以消除大方坯芯部疏松、缩孔缺陷,然而大方坯应力状态复杂多变,符合大压下变形过程的断裂判据匮乏,制约了热芯大压下工艺的工业化应用。以GCr15大方坯为研究对象,通过设计异形压缩试样获取材料变形时不同的应力状态演化路径,还原了大方坯大压下过程复杂受力情况,建立了适用于热芯大压下轧制工艺的表面裂纹判据;结合大方坯芯部孔洞压合实验有限元模拟,分析了热芯大压下轧制时孔洞形状演变和表面开裂风险。结果表明:得益于热芯大压下大方坯的厚向温度梯度,压下率越大,对于铸坯芯部缺陷的改善效果越明显。当压下率为33.3%时,铸坯芯部孔洞实现完全闭合,且此时铸坯表面实际损伤值低于临界损伤值,不会产生新的表面裂纹缺陷。

关键词：热芯大压下轧制表面裂纹孔洞压合数值模拟 GCr15大方坯

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New Species of the Isolated Psaroniaceous Rachis from the Early Permian in China

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Journal of Integrative Plant Biology 2008年第1期50卷 119-127页

作者： ning xiang Shi-Min Ma Bao-Lin Tian Shi-Jun Wang Ming-Shan Zhang State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany the Chinese Academy of Sciences Beijing 100093 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China China University of Mining and Technology Beijing 100083 China 107th Team Northeast Coal Geology Bureau Fuxin 123000 China

A new kind of marattialean raches are reported from the coal balls in Coal Seam No.7 in the upper part of the Taiyuan Formation （early Early Permian） from Taiyuan, Shanxi, China and are assigned to the genus Stipitopteris Grand＇Eury （Psaroniaceae）. The present specimens are different from all six reported species of the genus, and are therefore proposed as a new species： Stipitopteris shanxiensis. The raches of the new species are generally dorsi-ventrally flattened. The main raches usually exhibit scales of different forms on their surface. Beneath the epidermis is a zone of parenchymatous cells, some of which contain tannin-like contents. Inside this is a zone of small sclerenchymatous cells. Inward are the ground tissue and vascular bundles. The vascular bundles are continuous and are in two circles： the outer circle assumes a transversely elliptical shape with the gap and pinna trace, and the inner circle assumes a shallow C.shape with inrolled ends. The ground tissue located at the inner side of the vascular bundle is composed of thicker-walled parenchymatous cells. The cells of the ground tissue are vertically elongated in longitudinal sections. Subordered raches are smaller and have simpler structures than the main raches. The parenchyma zone beneath the epidermis is thinner, usually one to two cells wide and the sclerenchyma zone is usually absent. The scales are poorly developed and there is only one C-shaped vascular bundle. The new species is comparable to the crosiers of Psaroniaceae of the Euramerican Flora in some aspects, for example, it has a dorsi-ventrally flattened rachis and scales on the surface of the rachis. However, the other features and the preservative conditions of the present specimens indicate that they are not crosiers, but fully developed or mature raches. The new species is the first well-studied anatomically-preserved rachis of Psaroniaceae from the Cathaysian Flora and bears significance not only in understanding the anatomy and taxonomy of Psaroniaceae in the Cathaysian Flora,

关键词： coal ball Early Permian new species Psaroniaceae rachis Stipitopteris.

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基于超声的高浓度浆液两相流粒径在线测量

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化工进展 2024年第2期43卷 593-601页

作者：张世玮李玉宇孟磊宁翔苏明旭上海理工大学上海市动力工程多相流动与传热重点实验室上海200093 大唐环境产业集团股份有限公司北京100097

近年来颗粒粒径测量问题受到了国内外的广泛研究,其中高浓度两相流的在线测量越来越成为关注的焦点。为测量石灰石浆液在流动过程中的颗粒粒径分布,由超声在线测量装置获得质量分数10%~40%浆液在不同时间的超声衰减谱。根据Harker&Templ... 详细信息

近年来颗粒粒径测量问题受到了国内外的广泛研究,其中高浓度两相流的在线测量越来越成为关注的焦点。为测量石灰石浆液在流动过程中的颗粒粒径分布,由超声在线测量装置获得质量分数10%~40%浆液在不同时间的超声衰减谱。根据Harker&Temple和BLBL散射叠加模型预测,结合基于最优正则化的加权非负最小二乘算法(ORT-WTLS)计算浆液粒径分布。结果表明:由不同粒径理论衰减谱和10dB含噪衰减谱计算的颗粒直径与设定值的相对误差均小于5%。衰减系数并非随浆液浓度线性递增,表明Harker&Temple和BLBL非线性模型适用于高浓度浆液体系的理论预测。使用ORT-WTLS算法对浆液实验衰减谱中的测量误差作加权处理并计算颗粒粒径分布,其测量结果与图像法基本吻合,动态测量误差小于7%。因此结合实验超声衰减谱、颗粒测量的非线性声学理论模型及ORT-WTLS反演算法可准确计算高浓度浆液的颗粒粒径分布。

关键词：浆液两相流超声粒径分布测量

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复杂地质深基坑施工关键技术

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建筑机械 2024年第4期 124-128,135页

作者：郑湘宁中铁十九局集团有限公司北京102600

文章以上海市轨道交通14号线工程为例,通过数值模拟手段研究了分区异步拆换撑施工对基坑变形的影响。结果表明,第二道支撑拆除会增加桩基最大位移,第一道支撑拆除时桩基最大变形基本不变,但桩顶位移会急剧增加,分区内施工对其他区域支... 详细信息

文章以上海市轨道交通14号线工程为例,通过数值模拟手段研究了分区异步拆换撑施工对基坑变形的影响。结果表明,第二道支撑拆除会增加桩基最大位移,第一道支撑拆除时桩基最大变形基本不变,但桩顶位移会急剧增加,分区内施工对其他区域支撑体系影响很小,且桩基变形均满足规范要求;换撑施工完毕后周边土地沉降值增加,施工时应注意进行实时监测,必要情况下对周边建筑进行加固处理。

关键词：复杂地质深大基坑拆换撑技术施工技术支撑变形

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