Search

By using an acid free wet chemical method, porous nano-ZnO with high photocatalytic performance was synthesized from galvanizing dross at room temperature. The route is an environmental way to realize high value conversion and reuse of galvanizing dross. X-ray diffraction, microstructure, electron diffraction and specific surface area analyses show, the prepared porous nano-ZnOs are hexagonal wurtzite structure ZnO strips. The strips are consist of ZnO nanoparticles, the strips growth direction is perpendicularly to the C axis when the calcination temperature is up to 350°C. With the increase of calcination temperature, the specific surface area of ZnO decreases and the crystallinity increases. The photocatalytic activity of nano-ZnO is related to its crystallinity and grain size. When the calcination temperature is 400°C and the calcination time is 2h, the nano-ZnO has been completely crystallized, the ZnO particle size is uniform and is about 20 nm, the photocatalytic activity is the best and can reach up to 95%.

A numerical model is established to investigate the effects of the influencing factors such as design parameters and operating conditions on the performance and behavior of the engagement process of the wet clutch based on the Navier–Stokes equations, contact mechanics, and heat transfer theory. A finite element contact model called KE contact model is used to analyze the rough contact during engagement process and thermal effect on the viscosity is considered based on heat transfer theory. The integration of the grooving into the simulation and the method of coupled finite element by domain decomposition of groove and ungrooved areas are put forward to facilitate the analysis. The experimental results agree well with the numerical model which takes the normal pressure, the temperature of ATF, relative revolution speed, the permeability and the groove geometry into account. The results of numerical simulation and the experiment indicate that the applied pressure not only affects the engagement time, but also has influence on the value of the engagement torque. Besides, the engagement time is roughly proportional to the relative revolution speed. The influencing factors such as the temperature of ATF, the permeability, grooves, the torque judders and effects of PID control parameters are also discussed in the paper. The performance and behavior of the engagement of the wet clutch were studied by two methods of numerical calculation and experimental research, which make the working process of the wet clutch more detailed.

Objectives: Hereditary spherocytosis (HS) represents a group of congenital diseases characterized by sphere-shaped erythrocytes on peripheral blood smears. The typical clinical manifestatio...

Uniform alignment of rigid-rod liquid crystal (LC) molecules under applied voltage is critical for achievement of high-quality display for thin-film transistor-driven liquid crystal display devices (TFT-LCDs). The polymeric components that can induce the alignment of randomly aligned LC molecules are called alignment layers (ALs). In the current work, a series of organo-soluble polyimide (SPI) ALs were designed and prepared from an alicyclic dianhydride, hydrogenated 3,3&prime, 4,4&prime, biphenyltetracarboxylic dianhydride (HBPDA), and various aromatic diamines, including 4,4&prime, methylenedianiline (MDA) for SPI-1, 4,4&prime, aminodianiline (NDA) for SPI-2, 3,3&prime, 5,5&prime, tetramethyl-4,4&prime, diaminodiphenylmethane (TMMDA) for SPI-3, and 3,3&prime, diethyl-5,5&prime, dimethyl-4,4&prime, diaminodiphenylmethane (DMDEDA) for SPI-4. The derived SPI resins were all soluble in N-methyl-2-pyrrolidone (NMP). Four SPI alignment agents with the solid content of 6 wt.% were prepared by dissolving the SPI resins in the mixed solvent of NMP and butyl cellulose (BC) (NMP/BC = 80:20, weight ratio). Liquid crystal minicells were successfully fabricated using the developed SPI varnishes as the LC molecule alignment components. The SPI ALs showed good alignment ability for the LC molecules with the pretilt angles in the range of 1.58&deg, &ndash, 1.97&deg, The LC minicells exhibited good optoelectronic characteristics with voltage holding ratio (VHR) values higher than 96%. The good alignment ability of the SPI ALs is mainly attributed to the good comprehensive properties of the SPI layers, including high volume resistivity, high degree of imidization at the processing temperature (230 &deg, C), good rubbing resistance, good thermal stability with glass transition temperatures (Tgs) higher than 260 &deg, C, and excellent optical transparency with the transmittance higher than 97% at the wavelength of 550 nm.

Oxcarbazepine is a second‐generation antiepileptic drug that is used to treat partial seizures. Although it has been increasingly used in pregnant women, its fetal safety has not been fully validated. We describe a 12‐hour‐old neonate who developed neonatal abstinence syndrome (NAS) after intrauterine exposure to oxcarbazepine. The neonate was born via cesarean section to a mother who took oxcarbazepine 300 mg/day for treatment of seizures throughout her pregnancy. Approximately 12 hours after birth, the infant developed paroxysmal jitter, which mainly presented as increased excitability, irritability, limb shaking, and increased muscle tone. These symptoms resolved by day 9 of life. Although NAS occurs most often after in utero exposure to opioids, exposure to other drugs during pregnancy may contribute to a small proportion of NAS cases. To our knowledge, this is the second case report of oxcarbazepine‐induced NAS. Pregnant women with epilepsy should weigh the pros and cons of continuing oxcarbazepine during their pregnancy when they are prescribed this drug. For infants with in utero oxcarbazepine exposure, comprehensive assessments and examinations are necessary for screening oxcarbazepine‐induced NAS.

Rapid solidification of Co-Si alloys was investigated by using vacuum suction casting in this study. Different microstructures and intermediate phases were obtained. Eutectic εCo phase and eutectoid εCo + αCo2Si structures were obtained in the first eutectic Co76.9Si23.1 alloy. The microstructures of hypereutectic Co70Si30 alloys were composed of primary αCo2Si phase and interdendritic lamellar eutectoid εCo + αCo2Si. While for hypoeutectic Co63Si37 alloy at the second eutectic point, CoSi dendrites were the primary phase, and αCo2Si+CoSi eutectoid structures can be seen at the interdendritic region. Especially, a metastable CoSi2 phase was found in Co63Si37 alloy. This indicates that eutectoid decomposition βCo2Si→ CoSi+αCo2Si is restrained in eutectic Co60.3Si39.7 alloy. For rapid solidified Co55Si45 and Co52Si48 alloys, αCo2Si+CoSi eutectoid structures were not observed, while metastable CoSi2 were obtained. The higher hardness achieved in Co-Si alloys at the second eutectic point, for the reason of the higher volume fractions of compound phases.

Liquid phase separation occurred in undercooled Fe-Cu alloys when the undercooling of the melt exceeds a critical value. 5at.% of Si was added into Cu50Fe50 alloy to investigate its effect on the liquid phase separation of Fe-Cu alloys in this paper. It indicated that the addition of Si could enhance the liquid-phase separation in Cu50Fe50 alloy. Additionally, with the increase of undercooling, second liquid-separation occurred in Fe-rich liquids, and many globular, tadpole and peanut-like morphology emerged in the Fe-rich region of Fe45Cu50Si5 alloy. Because of the mixing enthalpy of Fe-Si atomic pairs is more negative than that of Cu-Si atomic pairs; so Si is inclined to rich in Fe-rich region.

An audio digital watermarking algorithm based on QR decomposition and dither-modulation quantization is proposed. Arnold transform is utilized to scramble watermarking image in order to improve the security of the algorithm. Then chaotic sequence encrypts the watermarking which was folded before. DCT coefficients of the original audio signal are selected to embed the encrypted watermarking after QR decomposition. Dither-modulation quantization changes the largest R component values of the QR decomposition. Imperceptibility, security and robust test results show that the present method is more robust, and possesses good transparency and high security compared with the scheme based on SVD and dither-modulation quantization.

Li-Fraumeni syndrome (LFS) is a hereditary cancer predisposition syndrome, with the characteristics of early onset of cancer and high cancer incidence. TP53 is widely accepted as a pathogenic gene of LFS. A 2 years and 6 months old boy is reported in this article, who was diagnosed with embryonal rhabdomyosarcoma (RMS) in the left submandibular region. His brother died of RMS, and his grandmother was diagnosed with breast cancer. TP53 gene mutation detection was performed in this patient and some family members, indicating a missense mutation in exon 8 of the patient:c.844C > T (p.Arg282Trp, heterozygous). TP53 mutation was also found in his mother and sister. The boy met the diagnostic criteria for LFS. Among pediatric patients, the most common LFS diseases include osteosarcoma, adrenocortical cancer, central nervous system tumor, and soft tissue tumor. Additionally, leukemia and lymphoma are also involved. LFS patients have a high risk to suffer secondary or even multiple cancers. Therefore, it is necessary to perform genetic detection for pediatric cancer patients, especially those with hereditary predisposition cancers. TP53 mutation often indicates poor prognosis, so it is important to take active treatment and systematic monitoring for LFS family.