高掺量粉煤灰制备轻质高强陶粒

提出一种从粉煤灰中制备高强轻质陶粒的方法,为粉煤灰的贮存和有效利用粉煤灰中SiO_(2)、Al_(2)O_(3)等有用物质提供一种潜在的解决方案。在热力学分析的基础上,结合复杂硅酸盐体系中的矿物转化,对冷却方法、焙烧工艺和原料配方进行改进,设计出高掺量(60%~90%,质量分数)粉煤灰烧结制备轻质高强陶粒的优化方法。在焙烧温度为1200℃、保温时间5 min的条件下,得到密度小于0.93 g/cm^(3)、强度高达1.08 kN的陶粒。用该方法制备的陶粒比强度明显高于市场上随机购买的几种陶粒产品。

Increased prevalence of parent ratings of ADHD symptoms among children with bilateral congenital cataracts

AIM: To investigate the behavioral and psychological disorders and the prevalence of parent ratings of attention deficit hyperactivity disorder(ADHD) symptoms among children with bilateral congenital cataracts(CCs). METHODS: This cross-sectional study investigated children with bilateral CC aged 3-8 y(CC group) using Conners’ Parent Rating Scale-48(CPRS-48) from July to December 2016. The abnormal rates of psychological symptoms in CC children and normal vision(NV) children were compared using the Chi-square test. The scores of CC children were compared with those of NV children and the Chinese urban norm using the independent samples t-test and one-sample t-test, respectively. RESULTS: A total of 262 valid questionnaires were collected. The ratio of CC children to NV children was 119:143. The overall rate of psychological symptoms in CC children was 2.28 times higher than that in NV children(46.22% vs 20.28%, Pearson’s χ2=20.062;P<0.001). CC children showed higher scores for conduct problems, learning problems, impulsiveness/hyperactivity, anxiety, and hyperactivity index than NV children and the Chinese urban norm, particularly between the ages of 3 and 5 y. Furthermore, male children aged between 6 and 8 y showed a higher impulsive/hyperactive score than females of the same age(t=6.083, P<0.001). CONCLUSION: Children with bilateral CCs have a higher rate of ADHD symptoms than children with NV. This study provides clinical evidence that screening for psychological symptoms and particularly for ADHD symptoms in children with bilateral CC are recommended for an early diagnosis and timely treatment.

Effect of Compound Danshen Injection Combined with Labetalol on Liver Function and Placental Growth Factor in Patients with Eclampsia

Objective: To explore the effect of Compound Danshen Injection combined with Labetalol on liver function and placental growth factor in patients with eclampsia. Methods: Seventy patients with eclampsia who were treated in the Hospital from February 2017 to February 2019 were enrolled. The patients were divided into two groups according to the random number table, with 35 cases in each group. The Observation group was treated with Labetalol, and the combined therapy group was treated with Compound Danshen Injection combined with Labetalol. The liver function [alanine aminotransferase, aspartate aminotransferase, total protein, and albumin], hemorheology indicators, placental growth factor and serum insulin-like growth factor-1 and clinical indicators in the two groups were analyzed. Results: After treatment, the levels of alanine aminotransferase and aspartate aminotransferase in the combined therapy group were significantly lower than those in the Observation group. The levels of total protein and albumin in the combined therapy group were significantly higher than those in the Observation group (P<0.05). After treatment, the high-cut and low-cut whole blood viscosity, plasma viscosity and erythrocyte rigidity index in the combined therapy group were significantly lower than the Observation group, and the difference was statistically significant (P<0.05). After treatment, the levels of PLGF and IGF-1 in the combined therapy group were significantly higher than those in the Observation group, and the difference was statistically significant (P<0.05). After treatment, the gestational age, neonatal weight index, placental weight and neonatal 1 min Apgar score in the combined therapy group were significantly higher than the Observation group, and the difference was statistically significant (P<0.05). Conclusion: For patients with eclampsia, Compound Danshen Injection combined with Labetalol is with great safety, which can help stabilize their condition, and improve their liver function and placental growth factor status.

Controlling Corrosion Resistance of a Biodegradable Mg–Y–Zn Alloy with LPSO Phases via Multi-pass ECAP Process

Mg-RE(rear earth) alloys with long period stacking(LPSO) structures have great potential in biomedical applications. The present work focused on the microstructure and corrosion behaviors of Mg 98.5 Y1 Zn0.5 alloys with 18 R LPSO structure after equal channel angular pressing(ECAP). The results showed that the ECAP process changed the grain size and the distribution of LPSO particles thus controlled the total corrosion rates of Mg 98.5 Y1 Zn0.5 alloys. During the ECAP process from 0 p to 12 p, the grain size reduced from 160–180 μm(as-cast) to 6–8 μm(12 p). The LPSO structures became kinked(4 p), then started to be broken into smaller pieces(8 p), and at last comminuted to fine particles and redistributed uniformly inside the matrix(12 p). The improvement in the corrosion resistance for ECAP samples was obtained from 0 p to 8 p, with the corrosion rate reduced from 3.24 mm/year(0 p) to 2.35 mm/year(8 p) in simulated body fluid, and the 12 p ECAP alloy exhibited the highest corrosion rate of 4.54 mm/year.

A High-Strength and Biodegradable Zn–Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP

In this study, the microstructure, mechanical properties and corrosion behaviors of a Zn–1.6 Mg(wt%) alloy during multipass rotary die equal channel angle pressing(RD-ECAP) processing at 150 °C were systematically investigated. The results indicated that a Zn + Mg2 Zn11 + MgZn2 ternary eutectic structure was formed in as-cast Zn–Mg alloy. After ECAP, the primary Zn matrix turned to fine dynamic recrystallization(DRX) grains, and the network-shaped eutectic structure was crushed into fine particles and blended with DRX grains. Owing to the refined microstructure, dispersed eutectic structure and dynamically precipitated precipitates, the 8 p-ECAP alloy possessed the optimal mechanical properties with ultimate tensile strength of 474 MPa and elongation of 7%. Moreover, the electrochemical results showed that the ECAP alloys exhibited similar corrosion rates with that of as-cast alloys in simulated body fluid, which suggests that a high-strength Zn–Mg alloy was successfully developed without sacrifice of the corrosion resistance.

襄阳市新型冠状病毒肺炎住院患者特征的横断面研究

目的研究我院新型冠状病毒肺炎(Corona virus disease 2019,COVID-19)住院患者的临床流行病学特点和临床特征,为COVID-19的防控、诊断、治疗提供参考。方法提取、评估并分析截止2020年2月9日0时我院确诊的COVID-19患者资料,总结其流行病学特点和临床特征。结果我院共收治核酸检测确诊COVID-19患者102例,男52例,女50例;平均年龄50.38±16.86岁。输入性患者7例,37例有武汉旅行史。病毒潜伏期1-20天,平均8.09±4.99天。主要症状包括发热(84%)、咳嗽(57%)、咳痰(12%)、乏力(27%)、呼吸不畅(23%)、腹泻(15%)、食欲下降(10%)等。21例白细胞计数降低,56例淋巴细胞计数降低,66例(66/97)C反应蛋白升高,49例(49/85)血沉增快,19例(19/72)降钙素原升高,12例(12/13)铁蛋白升高。均行抗病毒、抗炎、对症治疗。8例入住ICU,6例出现呼吸衰竭,3例出现多器官功能衰竭,3例死亡。首次胸部CT检查90例、两次检查共有100例出现比较典型影像学表现,与核酸检测符合率98%。核酸检测首检阳性率66%,累计两次检测阳性率86%,累计3次96%。结论襄阳市COVID-19以二代传播为主,部分潜伏期长,性别易感性无明显差异。中老年为易感人群,重症及死亡病例集中分布在70岁以上年龄段,需采取针对性防控和诊断治疗措施。铁蛋白有可能反映该病炎症等变化情况。本地区重症及病死率低,可能与采取了积极有效的防治措施有关。3次核酸检测、2次CT检查,核酸、CT结合症状可大幅提高其诊断阳性率,有利于疾病防控和诊断治疗。

Novel synthesis of CuW composite reinforced with lamellar precipitates via aluminothermic reduction

The in situ synthesized reinforced phases in the matrix have the advantages of uniform dispersion and good interfacial bonding.Aiming at in situ synthesizing reinforced phases in CuW composite,a novel methodology for direct synthetization of CuW composite reinforced with lamellar precipitates by aluminothermic reduction is proposed,and CuW composites and their slags were systematically analyzed.The results indicate that,at temperatures of above 1800 K,the mole percentage of Al,copper oxides,tungsten oxide,and CuO·Al_(2)O_(3)increased rapidly with temperature increasing,which was not conducive to CuO and W0_(3)thermite reduction.