Predictive factors analysis of cesarean scar pregnancy treated by local injection of Lauromacrogol combined with curettage

To explore factors related to local injection of Lauromacrogol combined with curettage in the treatment of cesarean scar pregnancy. A total of 24 successful and 8 unsuccessful cases were included. The age, gravidity, parity, times of cesarean section, interval from the last cesarean section, preoperative human chorionic gonadotropin (HCG), HCG on the first day after operation, decreasing rate of HCG on the first day after operation, average diameter of gestational sac, and preoperative vaginal bleeding days were analyzed. There were no significant differences of age, gravidity, parity, previous cesarean section times between groups. The differences of preoperative HCG, HCG on the first day after operation, the decreasing rate of HCG, gestational sac diameter, preoperative vaginal bleeding days were statistically significant between groups. The interval from the last cesarean section and the decreasing rate of HCG were protective factors, while the mean diameter of gestational sac and period of vaginal bleeding before operation were risk factors for the success of the treatment. The mean diameter of gestational sac owned the best predictive value.     

Characterization of Inclusion Size Distributions in Steel Wire Rods

The control of inclusions in steel components is essential to guarantee strong performance. The reliable characterization of inclusion populations is essential not only to evaluate the quality of the components but also to allow the use of analytical procedures for the comparison and discrimination of inclusion populations. In this work, inclusion size distributions in wire rod specimens from six plant-scale heats were measured and analyzed. For the measurements, the metallographic procedure specified in the ASTM E2283 standard was used. The population density function (PDF) approach and the extreme value statistical procedure specified in the ASTM E2283 standard were used to analyze the whole size distribution and the upper tail of the size distribution, respectively. The PDF approach allowed us to identify differences among inclusion size distributions and showed that new inclusions were not formed after the liquid steel treatment process. The extreme value statistical procedure led to the prediction of the maximum inclusion length for each heat, which was used for the statistical discrimination of heats. Furthermore, the estimation of the probability of finding an inclusion larger than a given inclusion size using the extreme value theory allowed us to order the heats for different critical inclusion sizes.     

Strengthening Process by Electron Beam to Carbon Fiber for Impact Strength Enhancement of Interlayered Thermoplastic-Polypropylene Carbon Fiber Composite

Strong adhesion between recyclable thermoplastic (TP) polymer and carbon fiber (CF) has always been highly sought after. Therefore, for an interlayered CF reinforced TP polypropylene (CFRTPP) composite composed of 3 sized CF plies, alternating between 4 PP sheets, designated [PP]₄[CF]₃, a process of activating CF plies directly on both sides with homogeneous low energy electron beam irradiation (EBI) under N₂ gas, prior to lamination assembly and hot press of 4.0 MPa at 493 K for 3 min was carried out. Experimental results showed EBI dose of 43.2, 129, or 216 kGy significantly raised Charpy impact values, a_uc at all fracture probabilities, P_f. The 129 kGy dose appeared to be at or near optimum increasing a_uc 103%, 83%, and 65% at low-, median-, and high-P_f = 0.07, 0.50, and 0.93; while raising statistically lowest impact value, a_s at P_f = 0 calculated by 3-dimensional Weibull equation about 110%, indicating increased safety and reliability. It is assumed dangling bonds generated by the EBI rapidly form covalent bonds CF:C:O:C:PP and CF:C:C:PP at the interface, along with cross-linking in the PP near the CF. This is by charge transfer from CF to PP.     

大脑功能及α波优势频分析在厌学青少年的应用

目的探讨厌学青少年大脑功能状态和α波优势频特点及对心理咨询的指导价值。方法以厌学进行心理咨询的青少年为研究组,以发展咨询的青少年为对照组。统一使用ML-2001脑功能状态检查仪对其脑功能状态和α波优势竞争频率及熵值进行测量,并对测量结果进行分析。结果两组的α波竞争优势主频分布于各频之间无显著性差异,但主频与次频之差均值和熵值差异显著（P〈0.01）;各脑区同时段主频不统一和多频互扰现象和大脑少氧、疲劳、左右对称性、前后功率逆转情况差异显著（P〈0.01）。结论厌学青少年大脑工作状态和脑电活动的有序性和统一性较差,影响厌学青少年的认知和行为。     

中期18F-FDG PET/CT预测结外弥漫大B细胞淋巴瘤疗效和预后的方法学研究

目的 对比分析基于中期18F-氟脱氧葡萄糖（FDG） PET/CT的4项评估指标预测结外弥漫大B细胞淋巴瘤（EN-DLBCL）初始化疗疗效和预后的效能。 方法 回顾性分析2011年5月至2020年4月于北京医院经组织病理学检查或随访结果明确诊断为EN-DLBCL的77例初诊患者[其中,男性35例、女性42例,年龄（62.7±16.2）岁]的资料,包括治疗前基线PET/CT、初始化疗3~4个周期时的中期PET/CT和临床资料,并通过医院电子病历系统或电话随访。采用受试者工作特征（ROC）曲线确定中期PET/CT的最大标准化摄取值（SUVmax）的最佳临界值,将患者分为中期SUVmax<最佳临界值组和中期SUVmax≥最佳临界值组;按照中华医学会核医学分会淋巴瘤18F-FDG PET/CT及PET/MR显像临床应用指南推荐,以ΔSUVmax%=70%为最佳临界值,将患者分为ΔSUVmax%<70%组和ΔSUVmax%≥70%组;根据中期Deauville五分法评分,将患者分为Deauville五分法评分1~3分组和4~5分组;根据Lugano疗效评估标准,以中期疗效将患者分为缓解组和未缓解组。采用χ2检验、Kaplan-Meier生存分析和COX回归分析等方法分析基于中期PET/CT的SUVmax、Deauville五分法评分、Lugano疗效评估结果、ΔSUVmax%等指标对EN-DLBCL初始化疗疗效和预后预测的效能。 结果 （1）初始化疗结束时51例（66.2%）患者完全缓解;中期SUVmax<4.9组、Deauville五分法评分1~3分组的完全缓解率分别为82.6%（38/46）和85.0%（34/40）,显著高于对应的其他组,差异均有统计学意义（χ2=13.699、13.108,均P<0.001）;以ΔSUVmax70%和Lugano疗效评估结果进行分组的各组,其完全缓解率之间的差异均无统计学意义（χ2=0.018、0.368,均P>0.05）。（2）中位随访时间为24个月,范围为4~105个月,随访结束时19例（24.7%）患者疾病进展、复发或死亡;SUVmax<4.9组、Deauville五分法评分1~3分组、Lugano疗效评估缓解组患者的2年无进展生存期（PFS）均显著优于对应的其他组,差异均有统计学意义（χ2=6.148、4.586、4.765,均P<0.05）;Lugano疗效评估缓解组患者的2年总生存期（OS）优于未缓解组,差异有统计学意义（χ2=7.248,P=0.007）;以ΔSUVmax70%分组的患者之间的PFS和OS的差异均无统计学意义（χ2=0.051、3.331,均P>0.05）。多因素COX回归分析结果显示,Lugano疗效评估结果、国际预后指数评分是EN-DLBCL患者PFS（HR=12.179、14.330,P=0.015、0.005）和OS（HR=8.645、8.903,P=0.008、0.041）的独立预测指标。 结论 基于EN-DLBCL患者中期18F-FDG PET/CT的4项评估指标中,中期SUVmax<4.9和Deauville五分法评分1~3分能较好地预测EN-DLBCL患者初始化疗结束时的疗效是否为完全缓解,Lugano疗效评估结果是PFS和OS的独立预测指标。     

术后首次MELD评分及其衍生评分对肝衰竭患者肝移植术后早期生存率的预测价值

目的  探讨术后首次终末期肝病模型(MELD)评分及其衍生评分MELD联合血清钠(MELD-Na)评分、MELD联合血乳酸(MELD-Lac)评分对于肝衰竭患者肝移植术后早期生存率的预测能力。方法  回顾性分析135例肝衰竭肝移植受者的临床资料,根据术后28 d的生存情况分为早期生存组(110例)和早期死亡组(25例),比较两组患者的临床资料,采用受试者工作特征(ROC)曲线确定MELD评分、MELD-Na评分与MELD-Lac评分对肝衰竭患者肝移植术后早期生存率预测的最佳截取值,以评价不同评分预测肝衰竭患者肝移植术后早期生存率的能力。结果  两组患者术后首次MELD评分、MELD-Na评分、MELD-Lac评分比较,差异均有统计学意义(均为P < 0.05)。术后首次MELD评分、MELD-Na评分、MELD-Lac评分预测肝衰竭患者肝移植术后早期生存率的AUC分别为0.653 [95%可信区间(CI) 0.515~0.792]、0.648(95% CI 0.514~0.781)、0.809 (95% CI 0.718~0.900),最佳截取值分别为18.09、18.09、19.97,约登指数分别为0.398、0.380、0.525,灵敏度分别为0.680、0.680、0.840,特异度分别为0.720、0.700、0.690。MELD-Lac评分预测肝衰竭患者肝移植术后早期生存率的AUC大于MELD评分和MELD-Na评分,差异均有统计学意义(均为P < 0.05)。结论  术后首次MELD评分及MELD-Na评分对于肝衰竭患者肝移植术后早期生存率预测能力一般,而术后首次MELD-Lac评分是肝衰竭患者肝移植术后早期生存率更为可靠的预测指标。     

大学男生形态学指标比较和优选

目的 优选科学合理的大学男生形态学指标。方法 选取3 577名安徽省大学男生2013年健康体质测试数据,利用数理统计和密切值法研究8种人体形态学指标的差异。结果 男大学生8项形态学指标间相关程度较高,均能反映出大学生体质发育状况,但指标间差异有统计学意义(P<0.01),此差异来源于指标的不同算法;结果显示最优的指标为克托莱指数,其次是人体体积和体表面积体重指数,体质指数排在第4位。结论 男大学生体质发育评价最优指标为克托莱指数。     

The Microstructure and Pitting Corrosion Behavior of K-TIG Welded Joints of the UNS S32101 Duplex Stainless Steel

In this paper, the microstructure and pitting corrosion resistance of {"type":"entrez-protein","attrs":{"text":"S32101","term_id":"422005","term_text":"pir||S32101"}}S32101 duplex stainless steel keyhole tungsten inert gas welded joints with different heat inputs were studied. The electrochemical experiments were conducted in a 1 mol/L NaCl solution at room temperature. The pitting rupture potential of the heat affected zone and the weld metal zone under different heat inputs were tested. The research showed that with the increase of heat inputs, more ferrite was converted to austenite and the number and size of intragranular austenite grains in the weld metal zone increased. The austenite content of the heat affected zone and the weld metal zone increase with the increase of heat inputs, and the CrN and Cr₂N in the heat affected zone and the weld metal zone were mainly precipitated in the ferrite, in the austenite and ferrite/austenite interfaces. The pitting rupture potential value of the heat affected zone and the weld metal zone were increased with the increase of heat inputs, and the pitting corrosion resistance of the heat affected zone and weld metal zone were also increased with the increase of heat inputs. The relationship between the position CrN and Cr₂N, the austenite content and the pitting corrosion resistance were elucidated, and the initiation mechanism of the pitting was investigated. Additionally, in this work, the heat affected zone and weld metal zone made at 2.46 kJ/mm heat inputs had the best pitting corrosion resistance. The research results provided useful information for improving the pitting corrosion resistance of {"type":"entrez-protein","attrs":{"text":"S32101","term_id":"422005","term_text":"pir||S32101"}}S32101 duplex stainless steel keyhole tungsten inert gas welded joints.     

The neural correlates of value representation: From single items to bundles

One of the core questions in Neuro‐economics is to determine where value is represented. To date, most studies have focused on simple options and identified the ventromedial prefrontal cortex (VMPFC) as the common value region. We report the findings of an fMRI study in which we asked participants to make pairwise comparisons involving options of varying complexity: single items (Control condition), bundles made of the same two single items (Scaling condition) and bundles made of two different single items (Bundling condition). We construct a measure of choice consistency to capture how coherent the choices of a participant are with one another. We also record brain activity while participants make these choices. We find that a common core of regions involving the left VMPFC, the left dorsolateral prefrontal cortex (DLPFC), regions associated with complex visual processing and the left cerebellum track value across all conditions. Also, regions in the DLPFC, the ventrolateral prefrontal cortex (VLPFC) and the cerebellum are differentially recruited across conditions. Last, variations in activity in VMPFC and DLPFC value‐tracking regions are associated with variations in choice consistency. This suggests that value based decision‐making recruits a core set of regions as well as specific regions based on task demands. Further, correlations between consistency and the magnitude of signal change with lateral portions of the PFC suggest the possibility that activity in these regions may play a causal role in decision quality.     

1.5 T磁共振扩散加权成像可用于评估前列腺良恶性病变

目的探究前列腺良恶性病变采用1.5 T磁共振扩散加权成像(MR DWI)检查应用价值。方法对2017年10月~2020年8月我院收治136例前列腺病变患者相关资料进行回顾性分析,患者均接受MR DWI检查。分析DWI对于前列腺良恶性病变诊断价值,比较前列腺良恶性病变患者ADC值、eADC值及其对前列腺良恶性病变诊断价值,比较前列腺良恶性病变患者DWI半定量分级分布情况。结果以病理检查作为金标准,DWI诊断前列腺恶性病变敏感度、特异性及准确度分别为95.16%、98.65%、97.06%,Kappa值为0.941;恶性病变患者ADC值显著低于良性病变,eADC值显著高于良性病变(P < 0.05);ROC曲线显示,ADC值、eADC值及两指标联合诊断前列腺良恶性病变ADC值分别为0.902、0.967、0.990;恶性病变患者DWI半定量分级主要为4~5级,良性病变患者DWI半定量分级主要为1~3级,差异有统计学意义(P < 0.05)。结论1.5 T MR DWI用于评估前列腺良恶性病变价值优异,值得临床推广应用。