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目的本研究探讨老年慢性心力衰竭（CHF）患者发生低三碘甲状腺原氨酸综合征（LTS）的临床特点及可能的危险因素，建立预测LTS的列线图模型。方法回顾性分析老年CHF患者291例，根据患者入院后检测的甲状腺功能，将其分为LTS组107例和非LTS组184例。收集所有研究对象的一般信息资料和生化指标，同时对可能引起LTS的危险因素中的数值变量（除年龄）均采用中位数进行分组。采用卡方检验对各变量进行统计分析，多因素回归模型分析老年CHF患者合并 LTS的独立危险因素并建立列线图模型。采用C指数、校准曲线及受试者工作特征（ROC）曲线对预测模型进行评估。结果血肌酐（Scr）、C-反应蛋白（CRP）、白介素-6（IL-6）及纽约心脏病协会（NYHA）心功能分级与LTS发生呈正相关（OR 值分别为1.893、2.356、1.021、1.815， P ＜ 0.05），而血清白蛋白（Alb）与LTS呈负相关（OR = 0.412， P ＜ 0.05），即血清Alb水平越低，LTS越容易发生，将上述具有统计学意义的变量引入列线图后，其C指数为0.807［95% CI = （0.757，0.856）］；内部验证的校准曲线表明此预测模型的校准度良好；ROC 曲线分析显示此预测模型的区分度良好。结论老年CHF患者血清Scr、CRP、IL-6、Alb及心功能分级可能是LTS发病的危险因素；血清Alb可能是LTS发病的保护因素。基于以上多种危险因素构建的预测老年CHF患者发生LTS的列线图模型，具有较好的区分度和准确度，可为临床个体化防治提供指导。

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of South-Central Minzu University (Natural Science Edition) is the property of Journal of South-Central Minzu University (Natural Science Edition) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To analyze the influence of intraoperative blood glucose fluctuation and postoperative insulin resistance (IR) on postoperative cognitive dyfunction (POCD) in elderly patients undergoing thoracoscopic radical resection of lung cancer under general anesthesia. Methods A total of 352 elderly patients undergoing thoracoscopic radical resection of lung cancer under general anesthesia were collected and divided into the POCD group (n=84) and the nonPOCD group (n=268). The covariates between the two groups were balanced by propensity score matching method (PSM). Eighty-four cases in each group were successfully matched. The data between the two groups before and after PSM were compared. After PSM, receiver operating characteristic (ROC) curve of blood glucose fluctuation amplitude for predicting POCD was drawn, and patients were divided into the low-level blood glucose fluctuation group (n=97) and the high-level blood glucose fluctuation group (n=71) according to the cut-off value. According to the existence of postoperative IR, patients were divided into the IR group (n=53) and the non-IR group (n=115). Then, incidences of POCD between groups were compared. Logistic regression was used to analyze the influencing factors of POCD. Results Before PSM, the POCD group had older age, higher blood glucose fluctuation amplitude, IR ratio, operation time, anesthesia time, propofol dosage, remifentanil dosage and sufentanil dosage in anesthesia maintenance period than those in the non-POCD group (P＜0.05). The POCD group had higher blood glucose fluctuation amplitude and IR ratio than those in the non-POCD group after PSM (P＜0.05). After PSM, the incidences of POCD in the high-level blood glucose fluctuation group and the IR group were higher than those in the low-level blood glucose fluctuation group and the non-IR group (P＜0.05). Logistic regression analysis showed that higher intraoperative blood glucose fluctuation (OR=9.140, 95%CI: 4.338-19.257) and postoperative IR (OR=4.034, 95%CI: 1.163-13.991) were risk factors of POCD. Conclusion The risk of POCD in elderly patients undergoing thoracoscopic radical lung cancer surgery under general anesthesia is increased in patients with higher intraoperative blood glucose fluctuation and postoperative IR. [ABSTRACT FROM AUTHOR]

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In order to study the echo characteristics of sea-skimming laser weapons in the sea fog aerosol environment, it is necessary to further obtain the parameters of sea fog aerosols. Based on the mesoscale numerical atmospheric model WRF, a more intensive η layering was set in the vertical space for the spatial region where the sea fog exists, and the formation process of sea fog was numerically simulated from April 28 to April 29, 2015. The data of the sea fog characteristic parameters, such as the cloud-water mixing ratio and the fog top height, are calculated, and the horizontal visibility data affecting the laser echo is calculated. The results show that the η layer number can be further refined according to the spatial region where the sea fog exists (up to 400 m above sea level), and the characteristic parameters of sea fog can be further refined to improve the accuracy of the acquired data. The visibility parameter can be calculated from the sea fog characteristic parameters, such as cloud-water mixing ratio. The calculating accuracy is affected by the accuracy of the sea fog parameters. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Contemporary Pediatrics is the property of Xiangya Medical Periodical Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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The changes of outflow field caused by tank moving and the concentration distribution of dust at different wind speeds and mass flow rates are simulated using ANSYS Fluent software based on the theory of gas-solid two-phase flow. The generation mechanism of dust caused by tank moving in a typical battlefield and the laws of dust concentration distribution under the influences of different factors are studied, which can provide theoretical support and data reference for laboratory simulation of dust caused by tank moving. The results indicate that a large number of turbulent eddies generated at its tail and sides during tank moving are one of the main reasons to cause the movement of dust particles. The greater the wind speed is, the lower the dust concentration at the center of tank tail is, the higher the dust concentration at the sides of the tank tail is, and the more rapidly the concentration changes. When the dust flow rate is higher, the dust diffuses more fastly, and the average dust concentration increases linearly with the increase in the mass flow rate. The average dust concentration at other mass flow rates can be calculated based on the average dust concentration data at a certain mass flow rate. [ABSTRACT FROM AUTHOR]

BACKGROUND: Previous findings show that osteoblast-specific peptides can promote the repair and regeneration of skull defects in rabbits, and β-tricalcium phosphate (β-TCP) is used as a scaffold to carry osteoblast-specific polypeptides. Both of them not only complement each other, but also fully exert dual effects of osteoinduction and bone conduction. OBJECTIVE: To investigate the effect of osteoblast-specific peptide on the preservation of the anterior tooth extraction site in rabbits, and to study the effect on the alveolar bone remodeling. METHODS: Twenty-seven New Zealand white rabbits were randomly divided into three groups (n=9 per group), and the right mandibular incisors were removed to establish the animal models of tooth extraction. β-TCP/osteoblast-specific peptide compounds were implanted in the experimental group, and pure β-TCP meal was implanted into the material group. The blank control group had no implantation. Three rabbits from each group were scarified at 4, 8 and 12 postoperative weeks, and tissue samples were prepared for gross observation, histomorphology measurements, and radiographic measurements of extraction socket healing. RESULTS AND CONCLUSION: (1) Imaging results showed that the relative length of residual alveolar bone after modeling was ranked as follows: the experimental group > the material group > the blank control group, and the difference was statistically significant among groups (P < 0.05). Cone-beam CT findings in the three groups changed as time went on. At 4 and 8 postoperative weeks, the implanted materials in the experimental and material groups gradually degraded; the bone mass in the experimental group was significantly higher than that in the material and blank control groups. At 12 postoperative weeks, the experimental group had basically completed the reconstruction of tooth socket, but there were still some bone defects in the material and blank control groups. (2) Histomorphological findings showed that at 4 postoperative weeks, the experimental group exhibited obvious bone deposition lines, and the bone trabecula was widened; in the material and blank control groups, the new bone was less. At 8 postoperative weeks, a small amount of undegraded scaffold was found in the experimental group, with mature lamellar bone, the amount of new bone tissues in the material group increased and osteoblasts were obviously detected in the blank control group. At 12 postoperative weeks, the bone remodeling in the extraction socket of the experimental group was basically completed; in the material group, there were still a small amount of scaffold materials and dense plate-like new bone; and in the blank control group, the new bone tended to be mature, and there was obvious lamellar structure. To conclude, osteoblast-specific peptides can effectively preserve the length of the residual alveolar bone after tooth extraction, promote the formation of new bone, and have the function of preserving the tooth extraction site. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Physical Education / Tiyu Xuekan is the property of Journal of Physical Education Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The distribution of dust concentration in battlefield plays an important role in the study of anti-dust interference of laser fuze. Based on the computational fluid dynamics method, the RNG k-ε model and the discrete phase model are used to simulate the distribution rule of dust raised during tank moving. The dust distribution graphics and the changes of mean concentration with time on different cross sections in the computational domain are analyzed, and the influence rule of moving speeds of tank on the concentration distribution of raised dust is obtained. The results show that the dust concentration near tank tail changes more rapidly, while the dynamic range of dust concentration far away from the rear area of tank is larger. The influence of gravity on dust diffusion can be neglected, and the area of dust distribution is larger when the tank moves faster. Besides, the dust concentration decays exponentially in vertical direction. [ABSTRACT FROM AUTHOR]