作者机构：
[Sun, Delin; Sun, DL; Song, Ling; Yu, Minggong] Cent South Univ Forestry Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.
通讯机构：
[Sun, DL ] C;Cent South Univ Forestry Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.
关键词：
Finite element method;Mechanical strength;Product design;Security analysis;Structural evaluation
摘要：
This study focuses on the design and preparation of a thin-walled plastic chair, and its mechanical properties were investigated by high load, cyclic load and drop impact. The finite element method (FEM) was employed to accurately evaluate the chair's safety under these forces. Additionally, the effects of important structural parameters on the loading process in different states were investigated. Furthermore, a solid plastic chair prototype was created for experimental analysis. The findings revealed that increasing the thickness of the key structural parameters enhanced the safety properties of the chair under various load conditions. Optimal results were obtained when both dimensions were set to 5mm. The deformation errors in FEM, experimental strength analysis, fatigue analysis, and drop impact analysis were measured at 3.7%, 3.6%, and 11.7%, respectively. Similarly, the stress errors were determined to be 5.9%, 5.2%, and 6.5%. These results suggest that the structural design of the chair demonstrates excellent reliability. Studying the crucial structural parameters of a plastic chair can provide valuable insights for the scientific design and safety evaluation of thin-walled furniture.
通讯机构：
[Sun, DL ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
摘要：
Bamboo is an environmentally friendly building structural material. This work investigated the cavity structural characteristics and physical and mechanical properties of honeycomb sandwiches and natural bamboo in the longitudinal direction. The effective elastic parameters of periodically arranged hexagonal bamboo honeycomb cells under in-plane and out-of-plane loads were modeled using analytical and numerical approaches. Then, the effective elastic parameter model of bamboo honeycomb cells was validated by experiments and finite element analysis. The average errors between the calculated and experimental equivalent modulus of elasticity, Poisson's ratio, and shear modulus in the three principal axis directions were 7.43, 4.37, and 8.68%, respectively. The average relativities between the model values of the elastic parameters of the bamboo honeycomb cell and the simulation results in the three directions were 5.46, 5.40, and 6.12%, respectively. The experimental and finite element analysis showed that the constructed effective elastic parameter model of the bamboo honeycomb cell better reflected the state of the bamboo core when subjected to force. This study provides insights for further research on the mechanical properties of bamboo materials and their application in bamboo-based lightweight and high-strength sandwich structures.
摘要：
Ensuring sufficient mechanical performance while enabling lightweight design is critical for utilizing paper sandwich panels in the furniture industry. To design lightweight sandwich panels that balance mechanical properties and cost, this study developed a circular core paper sandwich panel (CCPSP) and investigated its structural efficiency using multi-objective optimization. The response surface method (RSM) based on Box-Behnken design was utilized to establish mathematical models relating the paper tube spacing, inner diameter, and height to the out-of-plane compressive strength, density, and cost. The resulting models effectively revealed the coupled effects of the parameters on the responses. Subsequently, the models were optimized using the non-dominated sorting genetic algorithm II (NSGA-II) to find the Pareto optimal trade-offs between maximizing compressive strength while minimizing its density and cost. The optimization solution resulted in an optimal set of paper tube geometries that maximized the structural efficiency of CCPSP. Overall, lower tube height conferred superior structural efficiency, while tube spacing and diameter were constrained. The results highlight the potential of CCPSP as an efficient and sustainable material for furniture manufacturing, enabled by multi-objective optimization of its structure.
期刊：
INTERNATIONAL JOURNAL OF GENERAL SYSTEMS,2024年 ISSN：0308-1079
通讯作者：
Sun, DL
作者机构：
[Sun, Delin; Sun, DL; Song, Ling; Yuan, Yuan; Yu, Minggong] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.;[Yuan, Yuan] Hunan Vocat Coll Sci & Technol, Changsha, Peoples R China.;[Qi, Cheng] Changsha Normal Univ, Changsha, Peoples R China.;[Minasov, Shamil] Ufa Univ Sci & Technol, Fac Informat & Robot, Ufa, Russia.;[Minasov, Shamil] Gulf Univ Sci & Technol, Dept Math & Nat Sci, Mubarak Al Abdullah, Kuwait.
通讯机构：
[Sun, DL ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.
关键词：
Median filter;quantum-dot cellular automata;QCADesigner-E 2.2 simulation;nano-design;digital image processing
摘要：
Digital image processing is manipulating and analyzing digital images using computer algorithms to enhance or extract information. Designing a median filter based on QCA offers potential advantages in terms of improved speed and energy efficiency. QCA technology utilizes the unique properties of quantum dots to perform computational tasks, including image processing. This study promotes the use of QCA technology since it is crucial to develop and implement the MF for DIP as it helps reduce noise. The suggested QCA-based MF has a single layer, a few cells, and exceptionally low latency. Comparing the suggested MF's cell consumption and occupied area to its best predecessor reveals 77.67% and 83.50% improvements, respectively. The MF is created using the comparison and selective module (CSM). Finally, each of the suggested architectures is designed and validated using the QCA Designer-E 2.2 simulation and a configuration tool for the Bistable approximation engine.
摘要：
Flexible, lightweight, and green cellulose films are highly desired to meet the increasing demands of flexible electronics, but they show a trade-off between their electrical conductivity and electrochemical properties. In this context, a phosphorus self-doped, interfacially-coupled electron transfer network was constructed to improve the interfacial bonding strength between nickel sulfide (Ni3S2) and bamboo fiber film (Ni3S2/BFF) to prepare biomass-based flexible electrodes with high specific capacitance (Ni3S2/BFF). Due to interfacial coupling, the conductive network was interconnected with the active material to form a complete 3-D structure that provided a fast network for electron transport. As a result, the prepared Ni3S2/BFF flexible electrode showed excellent electrochemical properties (6116 mF cm(- 2) at 36 mA cm(- 2 )) and good flexibility (it maintained electrochemical stability when bent to 180 degrees). degrees ). In addition, the P atoms introduced during electroless deposition greatly influenced the electrochemical performance of the electrode. After adding the optimal amount of sodium hypophosphite reductant (25 g/mL), the prepared Ni3S2/BFF at a current density of 40 mA cm(- 2) obtained a high areal specific capacitance of 5204 mF cm(- 2) . This value was about 3.8 times higher than that of low phosphorus (3.2 wt%) and 5.3 times higher than that of high phosphorus (6.9 wt%). A symmetric all-solid-state supercapacitor based on Ni3S2/BFF flexible electrodes exhibited a capacitance of 2925 mF cm-2 at a current density of 5 mA cm-(- 2) . The volumetric energy density reached 4.87 mWh cm(-- 3) when the power density was 121.86 mW cm(-3) . This work provides a new strategy for enhancing the interaction of biomass materials at the interface with metal sulfides and a new avenue for developing advanced supercapacitor electrodes.
摘要：
Bamboo fiber has attracted attention due to its high strength and flexibility, but it shows poor electron mobility and functionalities. In this research, phosphorus-doped flexible electrodes were constructed using bamboo fiber as the substrate, which was pretreated using sodium borohydride, followed by chemical nickel plating, and then used for urea electrocatalytic oxidation. The results showed that the bamboo fiber film provided a flexible support for nickel metal loading and a uniform and dense metal coating. Along with phosphorus self-doping, this conferred significant electrocatalytic activity to the nickel-phosphorus/bamboo fiber film (Ni–P/BFF). Notably, the electrode demonstrated an initial oxidation potential of 436.4 mV during urea oxidation. Phosphorus doping induced charge density redistribution and changed the electronic states during chemical plating, making the area around nickel atoms effective electron-trapping centers. This lowered the free energy of OH− adsorption on the surface of the conductive network in the electrolyte, which in turn lowered the onset potential and Tafel slope. These findings present a novel perspective for using biomass materials to create flexible electrodes.
期刊：
Journal of Materials Science,2024年:1-16 ISSN：0022-2461
通讯作者：
Sun, DL
作者机构：
[Yu, Xianchun; Zeng, Xufeng; Gong, Le; Sun, Delin; Sun, DL; Zeng, Rongxiang; Liu, Jingyi; Shi, Yiqing] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Wang, Xiangjun] Jiangmen Pengjiang Dist Wensen Decorat Mat Co LTD, Jiangmen 529000, Guangdong, Peoples R China.
通讯机构：
[Sun, DL ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
摘要：
To investigate the effect of Co(OH)(2) on the performance of the special capacitor, graphene was holed (HG) using microwave and KMnO4 and electrostatically sprayed with CNT to prepare a laminated structure bamboo woodceramics matrix (C/HG@BE). Then, Co(OH)(2) was electrodeposited on the matrix to form a supercapacitor electrode (C/HG@BE-Co-x). The results showed that the Mn nanoparticles generated by KMnO4 under the action of microwave were partially embedded in the graphene sheet mesh and formed holes in the graphene sheet after removal. The matrix had a clear laminated structure and good electrical conductivity. The electrical resistivity was approximately 0.163 Omega cm at 1000 degree celsius sintering temperature and remained low after the electrode was modified Co(OH)(2). Meanwhile, the Co(OH)(2) was uniformly deposited on the surface and within pores of the wall of the matrix and anchored by PPy to reduce fall. The electrode of C/HG@BE-Co-(1500) modified with Co(OH)(2) exhibited a good pseudocapacitance effect. At the current density of 0.1 A/g, the specific capacitance was approximately 255.12 F/g, and the retention of specific capacitance was maintained at 83.75% after 10000 cycles. When the energy density was 40.78 Wh/kg, the power density was 480 W/kg, indicating excellent electrochemical performance, which contributed of the synergistic action of electronic double layer capacitor and pseudocapacitance.
摘要：
Exploring new electrode structures and co-doped composite biomass material electrodes is considered to be an effective way of developing cheap, efficient carbon-based supercapacitors. A bamboo-based sandwich-structured matrix was prepared from thin bamboo veneer and bamboo fiber by pretreatment with H(3)PO(4) and Co(2+)-catalyzed graphitization. The pore structure was modulated by hydrothermal activation with NaOH and electrodeposition of carbon nanotubes (CNTs) to obtain CNTs modified, Co/P co-doped sandwich-structured woodceramics electrode (CNT@Co/P). It not only has an obvious sandwich structure, but also retains the natural structural characteristics of bamboo. The specific capacitance of the resulting electrode (CNT@Co/P-20) is as high as 453.72F/g using 1wt% of carboxylated multi-walled carbon nanotubes (CMWCNT) solution as the deposition electrolyte at a current density of 0.2 A/g for 20min at room temperature. When the power density is 500W/kg, the energy density reaches 21.3Wh /kg, showing a good electrochemical performance.
摘要：
Prepared in this study, Mn, N and S co-doped woodceramics electrodes (WC@Mn-N/S) were prepared using waste bamboo as the base material, carbon fiber as the reinforcement fiber, KMnO4 and CH4N2S as dopants and activators. Mechanical analysis revealed a 68 % increase in the flexural strength of the matrix material reinforced with carbon fibers. Scanning electron microscopy observation indicated that WC@Mn-N/S retained the original natural pore structure of bamboo. The specific surface area (BET) analysis revealed that WC@Mn-N/S exhibited a specific surface area of 861.7 m2/g, with its pore size structure mainly distributed in the range of 1.3–3.8 nm. Electrochemical performance tests showed that the introduction of Mn, N and S elements endowed the bamboo-based electrode with pseudocapacitance characteristics. Additionally, the synergistic effect between these three elements imparted pseudocapacitance to the electrode material. WC@Mn-N/S performent a specific capacitance of 615 F/g, at 0.2 A/g with excellent capacitance retention (99.4 % after 5000 cycles). In the practical assembled in symmetrical capacitor the material showed high power density 500 W/kg and energy density 57.9 Wh/kg, indicating its excellent electrochemical performance.
期刊：
INDUSTRIAL CROPS AND PRODUCTS,2024年222 ISSN：0926-6690
通讯作者：
Sun, DL
作者机构：
[Yu, Xianchun; Sun, Delin; Sun, DL; Zhao, Shan; Yu, Minggong; Shi, Yiqing; Wang, Zhangheng] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Zhao, Shan] Hunan First Normal Univ, Coll Art & Design, Changsha, Peoples R China.
通讯机构：
[Sun, DL ] C;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Hydrothermal response;Natural polymer materials;Radial compression;Shape memory;Structural support
摘要：
Wood is a naturally porous material with hydrothermal response properties, but the hard ingredients in the cell walls greatly affects its resilience properties, limiting its application in the field of shape memory. In this study, balsa wood was impregnated and reacted in an aqueous solution of ethylenediamine to remove the amorphous region of cellulose in the cell wall thereby expanding its lateral movement space. The wood was then combined with glycerol/malic acid/polyvinyl alcohol hydrogel to strengthen the overall support structure of the cells. In this way, the microscopic honeycomb porous network structure of the wood is preserved to the greatest extent possible, and the macroscopic representation is an elastomer that can withstand repeated extrusion without structural damage. The resulting wood has good plasticity at a moisture content of 50% or more, a good shapefixing effect when dried at low temperature to a moisture content of 15% or less, and can be restored to more than 90 % of its initial shape by hydrothermal treatment at a deformation rate of 40 % or less, and can be memorized many times in different shapes after the same process. In addition, the sample was still able to recover to more than 90 % after compressed to 15% of its initial height; the wood cells remained intact after several radial compressions to 50 %. These reflect the good elasticity of the treated wood. Rational utilization of natural resources is crucial for sustainable development, and this treatment, which preserves the pore structure of wood cells, brings into play the natural characteristics of the wood and provides a useful reference for the application of wood materials in the field of shape memory.
摘要：
Solid wood bending component has good mechanical properties and unique artistic characteristics. To investigate bending properties of solid wood and its mechanism, this paper has conducted the studies of softening and bending teakwood which is chosen as raw material, vacuum impregnation was carried out with environmentally friendly triethanolamine (TEA), sodium chloride (NaCl) and sodium dodecyl benzene sulfonate (SDBS) as compound softening solution, and the wood was softened with superheated steam as the medium. The results show that the infiltration of softening solution can increase the content of O and N elements in the wood and form C-NH2 and C-N bonds with C element. When the concentration of softening solution is 15% (m/m), the wood presents the best bending property, and the bending coefficient can reach 1/9.24, which is 20.48% higher than that of the untreated wood, and the qualification rate of bending components is increased to 85%. After drying and shaping, compression strength parallel to grain and bending strength increased by 22.91% and 20.82%, as well the indentation modulus and hardness of the cell wall increased by 16.70% and 21.45%, respectively. Meanwhile, the wet swelling rate and chord length change rate decreased by 51.39% and 3.37%.
期刊：
Colloid and Interface Science Communications,2023年57:100755 ISSN：2215-0382
通讯作者：
Sun, DL;Yuan, ZQ;Yang, KL
作者机构：
[Sun, Delin; Jiang, Xiawang; Yu, Minggong; Sun, DL] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Li, Cancheng; Yang, Qianqian; Jiang, Xiawang; Yuan, Zhiqing; Yuan, ZQ; Liu, Shujuan; Du, Juan; Meng, Shoutong; Li, Xinyi] Hunan Univ Technol, Natl & Local Joint Engn Res Ctr Adv Packaging Mat, Sch Packaging & Mat Engn, Zhuzhou 412007, Peoples R China.;[Yang, KL; Yang, Kangli] Cent South Univ, Zhuzhou Cent Hosp, Xiangya Med Coll, Dept Teaching, Zhuzhou 412000, Peoples R China.;[Yang, KL; Yang, Kangli] Cent South Univ, Zhuzhou Affiliated Hosp, Xiangya Med Coll, Zhuzhou 412000, Peoples R China.
通讯机构：
[Yang, KL ; Sun, DL ] C;[Yuan, ZQ ] H;Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;Hunan Univ Technol, Natl & Local Joint Engn Res Ctr Adv Packaging Mat, Sch Packaging & Mat Engn, Zhuzhou 412007, Peoples R China.;Cent South Univ, Zhuzhou Cent Hosp, Xiangya Med Coll, Dept Teaching, Zhuzhou 412000, Peoples R China.
关键词：
Highly flame-retardant;Superhydrophobic surface;Kraft paper;Carbon black nanoparticles;Polydimethylsiloxane
摘要：
To solve the problem of poor water resistance and flammability of kraft paper, we proposed a simple and efficient method for preparing highly flame-retardant superhydrophobic coating for kraft paper. Ammonium poly-phosphate (APP) and aluminum hydroxide (ATH) were utilized as the flame retardant layer, while Poly-dimethylsiloxane (PDMS) and candle soot were employed for the superhydrophobic layer. The results revealed that the limiting oxygen index (LOI) of superhydrophobic flame retardant kraft paper (SFKP) was as high as 80%, 296.0% higher than that of ordinary kraft paper (OKP). In addition, the water contact angle (WCA) of the SFKP surface reaches 154.1 degrees, and the water sliding angle (WSA) is 3 degrees. Meanwhile, the WCA of SFKP remains above 150 degrees after 12 h of immersion in water. This indicates that SFKP has excellent flame retardancy and water resistance, and is expected to be utilized in harsh environments such as floods or fires.
