Corrosion Behavior of Cu₆₀Zr₃₀Ti₁₀Metallic Glass in the Cl^–Containing Solution

Cu60Zr30Ti10 (at. %) ribbon was prepared by melt spinning. Its glassy structure was confirmed by X-ray diffraction (XRD). Its corrosion behavior in HCl and NaCl solutions was investigated by electrochemical polarization measurement. The surfaces before and after corrosion were observed with scanning electron microscope (SEM) and analysis was performed using electron dispersive spectroscopy (EDS). The results show that the decrease of current density is due to the formation of a mixture of simple oxides or complex oxidic compounds. In both cases, the corrosion potential decreases with increasing chloride concentration. The passive film forms easier in HCl than in NaCl. In addition, the higher is the chloride concentration, the easier is the passivation.

Correlation of peripheral blood NK cell content with tumor marker content and proliferation molecule expression in patients with non-small cell lung cancer

Objective:To study the correlation of peripheral blood NK cell content with tumor marker content and proliferation molecule expression in patients with non-small cell lung cancer (NSCLC).Methods: A total of 80 patients who were diagnosed with NSCLC in our hospital between June 2014 and October 2016 were selected as the NSCLC group of the research, and 96 healthy volunteers who received physical examination in our hospital during the same period were selected as the control group of the research. The peripheral blood NK cell content and serum tumor marker contents of two groups of subjects were determined, and the proliferation molecule expression levels in lung cancer focus tissue and focus tissue adjacent to carcinoma of NSCLC group were determined.Results:Peripheral blood NK cell content of NSCLC group was significantly lower than that of control group;serum CEA, CA125, Cyfra21-1 and HE4 contents were significantly higher than those of control group, and serum CEA, CA125, Cyfra21-1 and HE4 contents of NSCLC patients with high NK cell content were significantly lower than those of NSCLC patients with low NK cell content;c-myc, c-FLIP, Livin, Moesin and k-ras protein expression in lung cancer focus tissue were significantly higher than those in focus tissue adjacent to carcinoma, and c-myc, c-FLIP, Livin, Moesin and k-ras protein expression in lung cancer focus tissue with high NK cell content were significantly lower than those in lung cancer focus tissue with low NK cell content.Conclusion: Peripheral blood NK cell content significantly reduces in patients with NSCLC and is associated with the cancer cell proliferation activity.

非均质显微组织对Ti-15Zr合金阳极氧化行为与生物相容性的影响

研究非均质显微组织对钛合金阳极氧化行为与生物相容性的影响。采用粉末冶金及后续热轧和热处理方法制备非均质Ti-15Zr合金,并采用电化学阳极氧化法获得纳米管阵列表面。结果表明,阳极氧化非均质Ti-15Zr上形成由纳米管团簇和显微裂纹构成的微纳结构表面,这种结构的形成与条纹状的(0001)取向晶粒以及Zr的非均质分布有关。与阳极氧化的电弧熔炼Ti-15Zr对照组相比,阳极氧化非均质Ti-15Zr具有与其相当的超亲水性,且蛋白吸附与细胞增殖效果更好,这主要是由于后者具有多尺度结构表面。

Enhanced effect of plasma on catalytic reduction of CO2 to CO with hydrogen over Au/CeO2 at low temperature

In terms of the reaction of COreduction to CO with hydrogen, COconversion is very low at low temperature due to the limitation of thermodynamic equilibrium（TE）. To overcome this limitation, plasma catalytic reduction of COto CO in a catalyst-filled dielectric barrier discharge（DBD） reactor is studied. An enhanced effect of plasma on the reaction over Au/CeOcatalysts is observed. For both the conventionally catalytic（CC） and plasma catalytic（PC, Pin= 15 W） reactions under conditions of 400 °C, H/CO= 1,200 SCCM, GHSV = 12,000 mL·gcat·h, COconversions over Au/CeOreach 15.4% and 25.5% due to the presence of Au, respectively, however, those over CeOare extremely low and negligible. Moreover,COconversion over Au/CeOin the PC reaction exceeds 22.4% of the TE conversion. Surface intermediate species formed on the catalyst samples during the reactions are determined by in-situ temperatureprogrammed decomposition（TPD） technique. Interestingly, it disclosed that in the PC reaction, the formation of formate intermediate is enhanced by plasma, and the acceleration by plasma in the decomposition of formate species is much greater than that in the formation of formate species on Au/CeO. Enhancement factor is introduced to quantify the enhanced effect of plasma. Lower reactor temperature, higher gas hourly space velocity（GHSV）, and lower molar ratio of H/COwould be associated with larger enhancement factor.

Interfacial phenomena of water striders on water surfaces: a review from biology to biomechanics

Water striders have intrigued researchers for centuries from the viewpoints of biology to biomechanics. In this review, we introduce the basic theories and techniques of physics and force measurement for biomechanical research into water striders. Morphological and behavioral traits of water striders are summarized and discussed from biomechanical perspectives, along with comparative study. This integrated review also highlights potential directions for studies on water-walking arthropods,which might inspire future biological and biomechanical research.

Pancreaticoduodenectomy with Roux-Y anastomosis in reconstructing the digestive tract: report of 26 patients

Objective: To explore the way to lower the morbidity and mortality of patients after pancreaticoduodenec- tomy. Methods: Between March 1998 and March 2001, 26 patients with periampullary tumors received pancre- aticoduodenectomy (PD) with Roux-Y anastomosis to reconstruct the digestive tract. Of these patients, 6 had ductal cell carcinoma at the head of the pan- creas, 8 distal common bile duct carcinoma, 5 amp- ullar adenocarcinoma of the Vater, 6 duodenal ade- nocarcinoma, and 1 duodenal malignant lynphoma. A 30-40 cm free vascularized segment of the proxi- mal jejunum was taken and pulled up to the bed of the duodenum for end-to-end pancreaticojejunosto- my, end-to-side choledocojejunostomy or side-to-side jejunojejunostomy by a single loop. Results: The operative mortality was zero. Postoper- ative intraabdominal hemorrhage occurred in 2 pa- tients, but no leakage during pancreaticojejunostomy or choledocojejunostomy as well as abdominal infec- tion. The patients were discharged from the hospital on the tenth to fourteenth day after operation. Fol- low-up for 5 to 36 months (mean 21 months) re- vealed chronic steatorrhea and malnutrition in one patient (3.85%), and good digestive function and normal nutritional status in 25 (96.15%). No bile reflux gastritis, retrograde infection, anastomotic ul- cer, and dumping syndrome were observed. Conclusion: Our results show that this procedure can effectively reduce the morbidity and mortality of pa- tients after PD.

Superhydrophobic Fe-based amorphous coating fabricated by detonation spraying with excellent anti-corrosion and self-cleaning properties

Amorphous alloys without crystalline defects(dislocation,crystal boundary)are ideal hydrophobic coating materials due to their low surface energy.This work used a synergistic method of detonation spraying and surface modification to obtain the superhydrophobic Febased amorphous coatings with high hardness and dense structure on the Q 235 substrate.The results showed that the water contact angles(WCA)of the superhydrophobic coating was 160°±3.6°,and water droplets could bounce off the superhydrophobic coating surface,illustrating the excellent self-cleaning performance of coating.Notably,the corrosion current density(i_(corr))of the superhydrophobic coating further decreased by 2 orders of magnitude down to8.008×10^(-8)A·cm^(-2)compared to the as-deposited coating with 5.473×10^(-6)A·cm^(-2);the corrosion potential(E_(corr))of the superhydrophobic coating shifted by 34 mV to the positive side compared with that of the as-deposited coating(-310 mV).Likewise,the impedance modulus|Z|values of the superhydrophobic coating increased by nearly2 orders of magnitude up to 1×10^(5.6)compared to the asdeposited coating with 1×10^(3.8).Even through lasting immersion in NaCl for 10 days,|Z|values of the superhydrophobic coating were still much higher than those of the as-deposited coating.The superhydrophobic Fe-based amorphous coatings could respond to their applications under extreme conditions due to their excellent hydrophobicity and self-cleaning properties,illustrating their promising future in aerospace,automotive,and machinery industries.

Surgical management of newborns with combined tracheoesophageal fistula, esophageal atresia, and duodenal obstruction

To the Editor: The incidence of esophageal atresia (EA) along with tracheoesophageal fistula (TEF) is approximately 1/3000 in newborns.[1] A large population study revealed that 46% of patients with TEF/EA had at least one of the other vertebral, anal, cardiac, tracheal, esophageal, renal, and limb (VACTERL) malformations.[2] Duodenal obstruction has an incidence of 1/7000 live births and can be caused by duodenal atresia (DA) or annular pancreas (AP).[3] AP is an uncommon congenital anomaly, and duodenal obstruction most commonly presents in the infancy or early childhood of patients.[4] The incidence of DA combined with EA varies between 3% and 6%,[5] and DA combined with EA is often associated with significant morbidity and mortality.[6]