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Hao Xu,GUOHUA LUO 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
This review gives a summary on heterogeneous non-mercury catalysts for acetylene hydrochlorination process. First, various catalysts are classified and their performances are compared. Next, studies on catalytic performance by theoretical characterizations and molecule level simulations are introduced. Then, efforts for industrial scaling up and corresponding long-term plant trial results are presented to show enormous potential of state-of-the-art catalysts. Finally, the crucial engineering issues for future industrialization process including kinetic study, reactor design & simulation and material recycling process are proposed. Based on promising achievements, we believe that extensive industrial application of non-mercury catalysts for acetylene hydrochlorination will soon become reality.
Xu Zhao,Yucheng Su,Hongqiang Wang,Zhiwu Lei,Eming Hu,Fang Hu,Qingliang Wang,Lechang Xu,Shiyao Fan,Xinwei Liu,Xuanzhang Hao 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.1
With the wide application of beryllium globally, industrial wastewater has rapidly increased. Previously, adsorption was effective in treating this issue. However, most adsorbents have a poor removal rate, primarily in the low adsorption capacity. To remove Be from industrial wastewater and overcome the disadvantages of low adsorption capacity and poor removal rate of existing adsorbents, typical agricultural waste lotus leaf was used to prepare Al-activated carbon (Al-AC) by the impregnation-calcination modification of Al(NO3)3. The theoretical maximum adsorption capacity of Al-AC was 32.86 mg/g. Langmuir, Freundlich, and Temkin models were used to thermodynamically analyze Al-AC, and adsorption thermodynamics demonstrated that the adsorption reaction of Al-AC was endothermic. Through characterization analysis, the specific surface area of the modified AC increased from 4.3573 to 155.87 m2/g. This study provides a new approach to preparing and modifying AC and a new method for removing Be from industrial wastewater.
Regional Science and Technology Resource Allocation Optimization Based on Improved Genetic Algorithm
( Hao Xu ),( Lining Xing ),( Lan Huang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.4
With the advent of the knowledge economy, science and technology resources have played an important role in economic competition, and their optimal allocation has been regarded as very important across the world. Thus, allocation optimization research for regional science and technology resources is significant for accelerating the reform of regional science and tech-nology systems. Regional science and technology resource allocation optimization is modeled as a double-layer optimization model: the entire system is characterized by top-layer optimi-zation, whereas the subsystems are characterized by bottom-layer optimization. To effica-ciously solve this optimization problem, we propose a mixed search method based on the orthogonal genetic algorithm and sensitivity analysis. This novel method adopts the integrated modeling concept with a combination of the knowledge model and heuristic search model, on the basis of the heuristic search model, and simultaneously highlights the effect of the knowledge model. To compare the performance of different methods, five methods and two channels were used to address an application example. Both the optimized results and simu-lation time of the proposed method outperformed those of the other methods. The application of the proposed method to solve the problem of entire system optimization is feasible, correct, and effective.
Xu, Hao,Mei, Xiao-Peng,Xu, Li-Xian The Korean Dental Society of Anesthsiology 2017 Journal of Dental Anesthesia and Pain Medicine Vol.17 No.1
Cleft palate is one of the most common congenital malformations of the oral and maxillofacial region, with an incidence rate of around 0.1%. Early surgical repair is the only method for treatment of a cleft lip and palate. However, because of the use of inhalation anesthesia in children and the physiological characteristics of the cleft palate itself combined with the particularities of cleft palate surgery, the incidence rate of postoperative emergence agitation (EA) in cleft palate surgery is significantly higher than in other types of interventions. The exact mechanism of EA is still unclear. Although restlessness after general anesthesia in children with cleft palate is self-limiting, its effects should be considered by clinicians. In this paper, the related literature on restlessness after surgery involving general anesthesia in recent years is summarized. This paper focuses on induction factors as well as prevention and treatment of postoperative restlessness in children with cleft palate after general anesthesia. The corresponding countermeasures to guide clinical practice are also presented in this paper.
Xu, Hao,Wise, John H.,Norman, Michael L.,Ahn, Kyungjin,O’Shea, Brian W. American Astronomical Society 2016 The Astrophysical journal Vol.833 No.1
<P>Cosmic reionization is thought to be primarily fueled by the first generations of galaxies. We examine their stellar and gaseous properties, focusing on the star formation rates and the escape of ionizing photons, as a function of halo mass, redshift, and environment using the full suite of the Renaissance Simulations with an eye to provide better inputs to global reionization simulations. This suite probes overdense, average, and underdense regions of the universe of several hundred comoving Mpc(3), each yielding a sample of over 3000 halos in the mass range of 10(7)-10(9.5)M(circle dot) at their final redshifts of 15, 12.5, and 8, respectively. In the process, we simulate the effects of radiative and supernova feedback from 5000 to 10,000 Population III stars in each simulation. We find that halos as small as 10(7) M-circle dot are able to host bursty star formation due to metal-line cooling from earlier enrichment by massive Population III stars. Using our large sample, we find that the galaxy-halo occupation fraction drops from unity at virial masses above 10(8.5) M-circle dot to similar to 50% at 10(8) M-circle dot and similar to 10% at 10(7) M-circle dot, quite independent of redshift and region. Their average ionizing escape fraction is similar to 5% in the mass range of 10(8)-10(9) M-circle dot and increases with decreasing halo mass below this range, reaching 40%-60% at 10(7) M-circle dot. Interestingly, we find that the escape fraction varies between 10%-20% in halos with virial masses of similar to 3 x 10(9) M-circle dot. Taken together, our results confirm the importance of the smallest galaxies as sources of ionizing radiation contributing to the reionization of the universe.</P>