Research on the impact effect of AP1000 shield building subjected to large commercial aircraft

Wang, Xiuqing,Wang, Dayang,Zhang, Yongshan,Wu, Chenqing Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.5

This study addresses the numerical simulation of the shield building of an AP1000 nuclear power plant (NPP) subjected to a large commercial aircraft impact. First, a simplified finite element model (F.E. model) of the large commercial Boeing 737 MAX 8 aircraft is established. The F.E. model of the AP1000 shield building is constructed, which is a reasonably simplified reinforced concrete structure. The effectiveness of both F.E. models is verified by the classical Riera method and the impact test of a 1/7.5 scaled GE-J79 engine model. Then, based on the verified F.E. models, the entire impact process of the aircraft on the shield building is simulated by the missile-target interaction method (coupled method) and by the ANSYS/LS-DYNA software, which is at different initial impact velocities and impact heights. Finally, the laws and characteristics of the aircraft impact force, residual velocity, kinetic energy, concrete damage, axial reinforcement stress, and perforated size are analyzed in detail. The results show that all of them increase with the addition to the initial impact velocity. The first four are not very sensitive to the impact height. The engine impact mainly contributes to the peak impact force, and the peak impact force is six times higher than that in the first stage. With increasing initial impact velocity, the maximum aircraft impact force rises linearly. The range of the tension and pressure of the reinforcement axial stress changes with the impact height. The perforated size increases with increasing impact height. The radial perforation area is almost insensitive to the initial impact velocity and impact height. The research of this study can provide help for engineers in designing AP1000 shield buildings.

Arbitrated Proxy Signature Scheme Based on Quantum Cryptography

Wang xiuqing,Zhang Jun 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.1

Proxy signature is a special signature which provided the signer can delegate his signing capability to others. The proxy signature provides that the original signer can delegate his signing permission to a proxy signer, and the proxy signer can replace the original signer to sign the message. In this paper, we propose a proxy signature scheme based on ideas from classical proxy signature schemes and quantum cryptography. The scheme is implemented by Bell states and a symmetrical quantum key cryptosystem. Compile with classical proxy signature schemes, the new scheme can guarantee the security by using quantum key distribution and one-time pads. And it also can prove that the scheme have the characteristics of non-counterfeit, non-disavowal and traceability. Furthermore, the new scheme uses a special quantum encryption to ensure the receiver cannot forge the signature. The validity of the new scheme can be verified, and it is a secure proxy signature scheme.

Addition of Theophylline or Increasing the Dose of Inhaled Corticosteroid in Symptomatic Asthma: A Meta-Analysis of Randomized Controlled Trials

Yan Wang,Kexiong Lin,Changzheng Wang,Xiuqing Liao 연세대학교의과대학 2011 Yonsei medical journal Vol.52 No.2

Purpose: Low-dose theophylline has anti-inflammatory effects. The aim of this study was to evaluate the effects of adding theophylline compared with increasing the dose of inhaled corticosteroid (ICS) on symptomatic asthma. Materials and Methods: The associated literature was acquired through deliberate searching and selected based on the established inclusion criteria for publications. The extracted data were further analyzed by a meta-analysis. Results: Four randomized, controlled,parallel studies were selected. Addition of theophylline produced a greater increase of forced expiratory volume in one second as %predicted (FEV1pred) by 2.49% [95% confidence interval (CI) 1.99-3.00; z = 9.70; p < 0.001], compared with increasing the dose of ICS. There was no difference between the two treatments in terms of peak expiratory flow (PEF). Conclusion: Addition of theophylline to ICS has similar therapeutic effects on improving lung function as increasing the dose of ICS in the treatment of symptomatic asthma.

Research on Influencing Factors of Continuous Learning Willingness in Online Art Education Based on the UTAUT Model

Youwang Wang,Xiuqing Fang 한국콘텐츠학회 2022 International Journal of Contents Vol.18 No.2

Fabrication and Analysis of an Effective Composite Desiccant for the Rapid Dehydration of Shield Waste Slurry

Xuquan Huang,Xiuqing Xie,Zhuo Liu,Anyi Huang,Zaiqian Wang,Ruting Wang,Xiaorong Zhao 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8

Massive shield waste slurry generated in shield tunnel construction is difficult to deal with because of its high water content (WC). Only when the WC of waste slurry is reduced to 40% − 60% it can be further disposed and reutilized. Three inorganic materials including attapulgite (AT), montmorillonite (MT) and water-washed kaolin (WK) were utilized to dehydrate the shield waste slurry and found that the WC of shield waste slurry dropped to 48.3%, 48.2% and 49.6% with 12.5% AT, 10% MT, and 12.5% WK as the desiccant, respectively. To enhance the dehydration efficiency, a composite desiccant was prepared with AT, MT and WK for the rapid dehydration of waste slurry. The optimized ratio of composite desiccant for AT: MT: WK was decided as 3.23%: 3.50%: 3.40% by response surface methodology based on Box-Behnken design, corresponding with the predicted WC as 44.9%. The WC of shield waste slurry can be decreased to 44.1% after the waste slurry has been dehydrated with the optimal composite desiccant after 6 days. The pH value of solidified shield waste slurry cured with the optimal composite desiccant was approximately 10.5, benefiting the further disposal and resource reutilization of shield waste slurry. The shield waste slurry was characterized by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. The results revealed that hydration products came into being during the hydration reaction when the shield waste slurry was cured with desiccant. The hydration products refabricated the microscopic lamellar structure of the waste slurry, squeezed the interlayer gap and drove the interlayer water away, leading to the depression of the WC of waste slurry.

Optimizing Oily Wastewater Treatment Via Wet Peroxide Oxidation Using Response Surface Methodology

Shi, Jianzhong,Wang, Xiuqing,Wang, Xiaoyin Korean Chemical Society 2014 대한화학회지 Vol.58 No.1

The process of petroleum involves in a large amount of oily wastewater that contains high levels of chemical oxygen demand (COD) and toxic compounds. So they must be treated before their discharge into the receptor medium. In this paper, wet peroxide oxidation (WPO) was adopted to treat the oily wastewater. Central composite design, an experimental design for response surface methodology (RSM), was used to create a set of 31 experimental runs needed for optimizing of the operating conditions. Quadratic regression models with estimated coefficients were developed to describe the COD removals. The experimental results show that WPO could effectively reduce COD by 96.8% at the optimum conditions of temperature $290^{\circ}C$, $H_2O_2$ excess (HE) 0.8, the initial concentration of oily wastewater 3855 mg/L and reaction time 9 min. RSM could be effectively adopted to optimize the operating multifactors in complex WPO process.

Concentration of polychlorinated biphenyls and risk assessment in finless porpoises from the East China Sea

Chen Bingyao,Jiang Huiping,Wang Hui,Yang Guang,Hao Xiuqing 한국독성학회 2024 Toxicological Research Vol.40 No.2

Polychlorinated biphenyls (PCBs) are bioaccumulative persistent organic pollutants with a great impact on cetaceans. To examine the content of PCBs and their risks to finless porpoises, this study determined the concentrations of seven typical PCB congeners in 56 tissue samples of East Asian finless porpoises (EAFPs) sampled in 2009–2012 from Ningbo (29.8835° N, 122.0644° E), Pingtan (25.5133° N, 119.8172° E) and Lvsi (32.1035° N, 121.6078° E). PCB138, PCB153 and PCB101 were the predominant congeners, accounting for 31.15%, 18.59% and 15.75%, respectively, of all PCBs detected. The content of PCBs increased with age in males but decreased from juveniles to adults in females due to transfer to calves by reproduction and lactation. EAFPs in Ningbo and Pingtan accumulated more PCBs than those in Lvsi Port. The trophic positions of EAFPs from Lvsi, Pingtan and Ningbo were 9.41, 8.95 and 9.43, respectively. PCB concentrations did not accumulate significantly with increasing trophic levels. The risk quotient index indicated that the risk of trichlorobiphenyl (3-PCB), tetrachlorobiphenyl (4-PCB), pentachlorobiphenyls (5-PCB), and hexachlorobiphenyls (6-PCB) to EAFPs in the East China Sea was generally low and within safe limits thus far.

Experimental Study on the Effect of Additives on Drainage Consolidation in Vacuum Preloading Combined with Electroosmosis

Jianli Hu,Xiaobing Li,Dikang Zhang,Jun Wang,Xiuqing Hu,Yuanqiang Cai 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.9

Vacuum-electroosmosis is a common method of foundation treatment; however, it is disadvantaged by fine soil particles clogging the drainage plate. To overcome this issue, this study treated the dredged fill from vacuum-electroosmosis with different additives. The parameters of discharged water, current, water content, and shear strength of soils treated with different amounts of Ca(OH)2, FeCl3, and NaCl were analyzed. The results showed that different additives have different effects on the vacuum-electroosmosis method for reinforcing dredger filling. Excessive additive contents were found to have an adverse effect on vacuum-electroosmosis, and hence, optimum amounts are required for the three additives. On comparing the optimum dosage of these additives, FeCl3 was observed to be the most energy-saving. From the aspect of anode corrosion and the costs involved, Ca(OH)2 was the most economical. For practical engineering applications, Ca(OH)2 was the most preferable additive. The results of this study provide guidance and scientific criteria for similar dredging foundation treatments.

Preparation and Characterization of Platinum Nanoparticles Supported by Non-woven Fabric for Formaldehyde Decomposition

Gaodan Luo,Qian Yu,Lin Yu,Xiaorui Wang,Xiuqing Hao,Jing Fu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10

Vacuum adsorption was employed to synthesize platinum/polyethylene terephthalate (PET) samples with greatpotential for indoor air quality improvement application. Pt nanoparticles (PNPS) were loaded onto surface of non-wovenfabric composed of polyethylene terephthalate (PET) and with high air permeability. High activity was sought for the Pt/PETcatalyst by investigating the effects of hexadecyl trimethyl ammonium bromide (CTAB) on PNP sizes and PET fibersurfaces. The prepared samples were characterized by XRD, SEM, TEM, TG, FTIR and XPS analysis. The results indicatedthat Pt/PET samples were successfully fabricated, and a formaldehyde conversation of 70.8 % was obtained within 150 minat 35 oC using Pt/PET with 0.6 wt% Pt loading. This research provided a facile method for depositing Pt onto PET fibers(non-woven fabric), and the catalytic activities of the resulting composite Pt/PET materials indicated them to be promisingfor applications to indoor air remediation.

Influence of Dynamic Loading Activation Time on Electro-osmotic Consolidation of Soft Soil

Xiaobing Li,Jianyu Shu,Jun Wang,Hongtao Fu,Peng Wang,Xiuqing Hu 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.11

Electro-osmosis is a suitable method for the consolidation of soft soil. However, the significant potential loss caused by the cracking of the soil near the electrode in the later stages of electro-osmosis hinders further improvement of its efficiency. Dynamic loading is applied to overcome this problem. The dynamic loading activation time is considered to strongly influence the performance of the combined electro-osmosis-dynamic loading process. In this paper, the maximum current ratio (MCR) is proposed as an index of the dynamic loading activation time. Laboratory tests were performed with different dynamic loading activation times to confirm the influence of the dynamic loading time on electro-osmosis consolidation. During the combined processes of dynamic loading and electro-osmosis, the current, electric potential, discharged water, and surface settlement were monitored. In the following testing, the water content and undrained shear strength were measured. Compared with the electro-osmosis method alone, electro-osmosis and dynamic loading was found to yield superior performance improvement. The method described in this paper to determine the optimal dynamic loading activation time as a function of the MCR, and electro-osmosis, exhibits potential as an improved approach for the consolidation of soft soil in engineering practice.