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随着电子器件芯片功率的不断提高，对散热材料的热物理性能提出了更高的要求。将高导热、低膨胀的增强相和高导热的金属进行复合得到的金属基复合材料，能够兼顾高的热导率和可调控的热膨胀系数，是理想的散热材料。本文对以Si、SiCp、金刚石、鳞片石墨为增强相的铜基及铝基复合材料的研究进展进行了总结，并就金属基复合材料目前存在的问题及未来的研究方向进行了展望。

目的分析急性脑梗死患者治疗前一站式CT灌注成像（CTP）及治疗前后临床影像资料，明确与预后相关的临床及影像特征。方法纳入CT/MRI 随访证实的39例急性脑梗死患者（男：女= 21：18，平均年龄65岁，平均起病时间8.4 h），所有患者均随访90天获取其mRS评分（平均2.8分）。对上述患者行320排螺旋CT一站式CTP［非增强CT（NCCT）-CT血管成像（CTA）-CTP］扫描，对NCCT图像行ASPECTS（alberta stroke program early ct score）评分，经后处理获得脑血管图，脑梗死核心区、缺血半暗带体积以及其相应比值，并获得CTP各灌注参数图［CBF，CBV，MTT，TTP，延迟达峰时间（Delay-TTP）］。将大小一致的感兴趣区分别放置在脑梗死核心区、缺血半暗带及其相应对侧脑实质，分别测量3次，取平均值。结果39例患者中，20例预后良好 （mRS ≤2）。相关分析发现，治疗前后NIHSS评分、梗死核心体积、缺血半暗带MTT及相应区域Delay-TTP 与随访90天mRS评分成明显正相关（P≤0.04）；而治疗后ASPECTS评分及梗死核心区CBF值与90 d mRS评分成明显负相关（P< 0.05）。进一步两组对比分析发现，治疗前后NIHSS、治疗后ASPECTS、CTP示梗死核心区体积及梗死核心CBF值与患者预后明显相关并具有统计学差异（P≤0.03）。ROC分析显示治疗后NIHSS评分对于预测急性脑梗死患者预后有着最高的诊断效能（AUC为0.90），其中敏感度、特异度及拐点值分别为79%，85%和4.5；而梗死核心区CBF具有最佳的特异度（89%），治疗后ASPECTS评分在预测预后方面具有最高的敏感度（94%）。结论急性脑梗死患者梗死核心区体积、CBF、治疗前后NIHSS及治疗后ASPECTS评分与患者的预后密切相关。相比较NIHSS评分，梗死核心区CBF对于预测急性脑梗死预后有着更高的特异度。

Copyright of Tianjin Medical Journal is the property of Tianjin Medical Journal 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.)

Copyright of Mining & Metallurgy (10057854) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group 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.)

Copyright of Journal of Drainage & Irrigation Machinery Engineering / Paiguan Jixie Gongcheng Xuebao is the property of Editorial Department of Drainage & Irrigation Machinery Engineering 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.)

After more than 50 years mining activities, deep prospecting for new orebodies rich in Ni and Cu become more and more important in Jinchuan super-large Ni-Cu-PGE sulfide deposit of Gansu, China. The 4 major orebodies of Jinchuan deposit are not connected each other, and location patterns of the orebodies have been affected by movement of the faults. On the basis of the studies on geology and geochemistry of these orebodies and the associated faults of Jinchuan deposit, the bifurcate magma conduit during the formation of Jinchuan deposit was identified. Branches of the bifurcate magma conduit develop and form the four major orebodies successively. Therefore, each individual orebody is formed by following a time sequence and has distinguishable features. The influence of post-mineralization faults on the spatial distribution of Jinchuan pluton and ore bodies was discussed; subsequently, potential and deep prospecting targets were also discussed. [ABSTRACT FROM AUTHOR]

As an effective treatment for end-stage liver disease, liver transplantation has been widely carried out worldwide and gradually captivated widespread recognition. With the advancement of liver transplantation techniques, the incidence of postoperative complications has been gradually declined, and the short-term and long-term prognosis of recipients have been constantly improved. However, a huge gap has existed between the supply and demand of donor organs, which is a major factors restricting the development of liver transplantation. The amount of liver transplantation operation in China is increasing year by year, the shortage of donor liver is becoming more and more prominent, and marginal donor liver is increasingly used in clinic. In recent years, the selection criteria of donor organs, organ preservation and functional maintenance have been continuously improved. In this article, the application and development trend of different techniques were reviewed from the perspectives of donor liver preservation and functional maintenance, and recent technical development and research results were summarized, aiming to provide reference for further enhancing the survival rate of grafts and recipients and promoting the development of liver transplantation in China. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Chemistry is the property of Chinese Journal of Applied Chemistry 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.)

Copyright of China Brewing is the property of China Brewing 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.)

Copyright of Tianjin Medical Journal is the property of Tianjin Medical Journal 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.)

Copyright of Tianjin Medical Journal is the property of Tianjin Medical Journal 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 develop a new model for predicting recurrence after liver transplantation for hepatocellular carcinoma ( HCC) beyond Milan criteria based on related preoperative and postoperative indicators. Methods A retrospective analysis was performed for the clinical data of the patients with HCC beyond Milan criteria who underwent orthotopic liver transplantation for the first time in Tianjin First Central Hospital from August 2014 to July 2018, and according to the presence or absence of recurrence during follow - up, the patients were divided into recurrence group and no - recurrence group. The t - test or the Mann - Whitney U test was used for comparison of continuous data between groups, and the chi - square test or the Fisher ' s exact test was used for comparison of categorical data between groups. The Kaplan - Meier method was used to plot survival curves, and the log - rank test was used for comparison of survival curves. Univariate and multivariate Cox proportional hazards regression analyses were used to identify the risk factors for recurrence - free survival after surgery. A new model was developed for recurrence after liver transplantation in the patients with HCC beyond Milan criteria based on the risk factors identified. The area under the receiver operating characteristic curve ( AUC) was used to evaluate predictive performance, and the Hosmer - Lemeshow test was used to assess the goodness of fit of the model Results A total of 117 patients with HCC beyond Milan criteria were enrolled in this study, with a median follow - up time of 24 ( 1 - 74 ) months. A total of 53 patients ( 45. 3 % ) experienced recurrence after surgery, among whom 52 (98. 1 % ) had recurrence within 3 years after surgery, with a median time to recurrence of 6 ( 1 - 52) months. The Cox proportional hazards regression analysis showed that preoperative serum alpha - fetoprotein ( AFP) > 769 ng/mL, neutrophil - lymphocyte ratio ( NLR) > 3. 75, and ki67 index > 0. 25 were independent risk factors for recurrence - free survival after liver transplantation. The model established based on these three risk factors had an A UC of 0. 843, with good sensitivity ( 88. 7%) and specificity ( 70. 3%) . The optimal cut - off value was selected according to the maximization of Youden index, and then the patients were divided into low - risk group ( 0 - 1 point) and high - risk group ( 1. 5 -4 points). The log - rank test showed that the low - risk group had significantly higher 3 -and 5 - year recurrence - free survival rates than the high - risk group ( 84. 1 %/72. 0% vs 10. 9% / 10. 9%, ² = 29. 425, P < 0. 001) Conclusion Liver transplantation for HCC beyond Milan criteria should be performed with caution, and the predictive model established based on preoperative AFP, NLR, and ki67 index can accurately assess the indication for liver transplantation in such patients. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Guangxi Normal University - Natural Science Edition is the property of Gai Kan Bian Wei Hui 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.)

Copyright of Journal of Guangxi Normal University - Natural Science Edition is the property of Gai Kan Bian Wei Hui 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 compare the difference of clinical efficacy between surgical magnifying glass and surgical microscope assisted hepatic artery reconstruction in living donor liver transplantation (LDLT). Methods Clinical data of 272 donors and recipients undergoing LDLT were retrospectively analyzed. According to different patterns of hepatic artery reconstruction, all recipients were divided into the magnifying glass group (n=189) and microscope group (n=83). The operation time, intraoperative blood loss, hepatic artery reconstruction site, diameter of anastomosis, incidence of postoperative complications and survival rate of recipients were statistically compared between two groups. Results Compared with the microscope group, the operation time, hepatic artery reconstruction time and intraoperative blood loss were significantly less in the magnifying glass group (all P<0.001). The most common site of hepatic artery reconstruction was the right hepatic artery in two groups, and the diameter of anastomosis was (2.1±0.9) mm in the magnifying glass group and (2.1±0.8) mm in the microscope group, with no statistical significance between two groups (P>0.05). The 1-, 2- and 3-year survival rates of recipients in the magnifying glass group were 88%, 86% and 85%, which did not significantly differ from 89%, 87% and 86% in the microscope group (all P>0.05). The incidence of postoperative complications did not significantly differ between two groups (all P>0.05). Conclusions The efficacy and safety of hepatic artery reconstruction in LDLT under surgical magnifying glass are equivalent to those under surgical microscope, with less operation workload and intraoperative blood loss. For experienced transplantation surgeons, it is recommended to perform hepatic artery reconstruction assisted by surgical magnifying glass. [ABSTRACT FROM AUTHOR]

Copyright of Tianjin Medical Journal is the property of Tianjin Medical Journal 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.)

Liver transplantation is the most effective method for hepatitis B-related liver failure, liver cirrhosis and hepatocellular carcinoma. However, the reactivation of hepatitis B virus (HBV) after liver transplantation is not conducive to the recovery of liver function and leads to poor clinical prognosis. The prevention and treatment of HBV reactivation is currently the focus of research by physicians and surgeons. The current viral suppression strategies can not completely eradicate HBV nor completely prevent the recurrence of HBV infection in the future. This article aims to explore the molecular mechanism of HBV reactivation after liver transplantation, in order to more effectively prevent the recurrence of hepatitis B after liver transplantation. [ABSTRACT FROM AUTHOR]

目的 观察不同年龄良性胆囊疾病患者腹腔镜胆囊切除前后肠道菌群变化。方法 126 例良性胆囊疾病患者按年龄分为青年组(<45岁) 37例、中年组(45～60岁) 70例、老年组(> 60岁) 19例,3组均行腹腔镜胆囊切除术(LC),比较各组手术前后粪便优势菌双歧杆菌(Lgg)、乳酸菌(Lac)、大肠杆菌(E. coli)和肠球菌(Ecc)计数及差值。结果 与同组术前比较,青年组术后 Lgg 计数减少,中年组和老年组 Lgg、Lac 计数减少和E. coli、Ecc计数增加(P均<0. 05)。与青年组比较,中年组E. coli、Ecc 及老年组 Lgg、Lac、E. coli、Ecc 计数差值增加 (P均<0. 05); 与中年组比较,老年组Lgg、Lac、E. coli、Ecc 计数差值增加(P均<0.05)。结论 LC可以引起良性胆囊疾病患者肠道菌群变化,这种变化随着年龄的增长更加明显,老年组 LC 术后肠道菌群失调较中、青年组严重,且表现为Lgg和Lac等益生菌减少,因此肠道微生态制剂应注重制剂种类和剂量对不同人群的针对性,以获得更好疗效。 [ABSTRACT FROM AUTHOR]

The Ni-Cu sulfide deposits in orogenic belts are very important in China. Nickel metal reserves of the Ni-Cu sulfide deposits discovered in orogenic belts, China, including a series of deposits in the southern margin of Central Asian orogenic belt and the large Xiarihamu Ni-Co deposit in East Kunlun orogenic belt, are more than 300×104 t. These discoveries make China having the most abundant magmatic sulfide deposits in orogenic belts over the world. However, some important issues on the formation of such deposits have not been well understood. For instance, what results in the formation of those large and super-large Ni-Cu sulfide deposits in the orogenic belts? What are the features of the related magmatism? When the magmatism occurs during tectonic evolution of the orogenic belts? What is the mechanism leading the extensive mafic magmatism? The above issues predominantly based on the recent studies of Huangshan-Jing’erquan Ni-Cu sulfide deposit belt as well as Permian regional strike-slip structure in northern Tianshan, Xinjiang were focused on. The results show that the collision between Junggar-Kazakhstan block and Tarim block along with regional dextral strike-slip structure in Permian results in break-off of the subduction oceanic slab and upwelling of the asthenosphere; the upwelling of the asthenosphere causes extensive melting of itself, and the metasomatized wedge mantle produces mafic magma; the strike-slip faults provide the pass way for the ascending mafic magmas and create spaces for the magmatic sulfide mineralized intrusions in the crust of Huangshan-Jing’erquan Ni-Cu sulfide deposit belt. [ABSTRACT FROM AUTHOR]

Objective To summarize the experience of diagnosis and treatment of Takotsubo syndrome (TTS) after liver transplantation. Methods Clinical data of one TTS patient after liver transplantation was retrospectively analyzed. Clinical features, diagnosis and treatment strategies were summarized, and literature review was conducted. Results A 43-year-old female patient successfully underwent split liver transplantation due to primary biliary cirrhosis for 8 years. At postoperative 3 d, the patient developed anxiety, irritation, dyspnea, disorientation, hypotension, N-terminal pro-brain natriuretic peptide (NT-proBNP) of >35 000 pg/mL, creatine kinase isoenzyme (CK-MB) of 5.9 U/L and troponin I (TnI) of 1.78 μg/L. Electrocardiogram indicated the signs of sinus rhythm. Echocardiography indicated diffuse weakening of the left ventricular wall motion and spherical dilatation of the apex, accompanied with moderate and severe regurgitation of the mitral valve and tricuspid valve. The left ventricular ejection fraction (LVEF) declined to 23%, whereas no abnormal segmental motion of ventricular wall or corresponding electrocardiogram changes were observed. The possibility of acute coronary syndrome was excluded. The InterTAK diagnostic score was 73. The diagnosis of TTS after liver transplantation was considered. Metoprolol, coenzyme Q10, recombinant human brain natriuretic peptide, deacetyl lanatoside and lorazepam were given. Echocardiography at postoperative 10 d showed that the left ventricular function was significantly improved and the LVEF recovered to 50%. The patient was discharged 40 d after liver transplantation. The liver function was recovered well. During postoperative follow-up, she was given with metoprolol till the submission date, and no recurrence was reported. Conclusions TTS after liver transplantation is rare in clinical practice. It is difficult to make the diagnosis. The condition of TTS is severe and clinical prognosis is poor. Prompt diagnosis and interventions should be implemented. [ABSTRACT FROM AUTHOR]