Joint Replenishment and Delivery Problem with Resource Constraint for Deteriorating Item

Chengyan Li,Jun Gao,Chuang Wang 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.2

The joint replenishment and delivery model with deterministic resource restriction for deteriorating item is developed. The model is formulated as cost minimization problem, including the ordering cost, the inventory holding cost, the transportation cost, the customer waiting cost and the deterioration cost. Differential evolution (DE) algorithm is proposed to solve the model. Numerical illustrations of the model and algorithm are presented and the sensitivity analysis with respect to deterioration rate of item is performed. The comparison between DE and genetic algorithm (GA) for solving the model are also made.

Differential Evolution Algorithm for Constraint Joint Replenishment Problem with Indirect Grouping Strategy

Li Chengyan,Gao Jun,Zhang Tianwei,Wang Xiaotian 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.5

The joint replenishment problem with deterministic resource restriction is considered. We present a differential evolution (DE) algorithm that uses indirect grouping strategy to solve constrained joint replenishment. The procedure and structure of the DE algorithm is proposed. Extensive computational experiments are performed to compare the performances of the DE algorithm with results of genetic algorithm (GA) and heuristic algorithm CRAND. The experimental results indicate that the DE algorithm performs relative to CRAND and superior to GA.

Olive Leaf Extract Facilitates Healing of Experimental Cartilaginous Injuries in Rabbits

Dezheng Gong,Chengyan Geng,Liping Jiang,Lihui Wang,Hiroyuki Yoshimuram,Laifu Zhong 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.3

We investigated the restorative effect of orally administered olive leaf extract (OLE) on experimentally produced cartilaginous injuries in rabbits. In total, three holes in the left stifle joint, including one in the medial trochlear ridge and two in the trochlear sulcus (proximal and distal) of articular cartilage, were prepared surgically using a drill. For the control group only tap water alone was administered daily, and for the OLE group a water-based solution of OLE (500 mg/kg/day) was administered daily. The injured areas were observed macroscopically and histologically at 3 weeks after the operation. The results indicate that OLE facilitated healing of the three holes and increased the weight of the biceps femoris muscle. Histological examination revealed that in the OLE group, matured cartilage tissues and connective tissues were mixed with regenerated or maturing cartilage tissues with massive proliferation in the injured parts, around which the proliferation of undifferentiated blast cells and the tissue with cartilage substrates were observed. The histological score of the OLE group was significantly lower than that of the control group. The percentage of proliferating cell nuclear antigen–positive cartilage cells in the OLE group was higher than in the control group. Mean density of the restored area observed with Safranin O staining was higher in the OLE group than in the control group. Therefore, OLE is effective for enhancing the healing of cartilaginous injuries. OLE may also have a beneficial effect of slowing and reducing the pathogenesis of degenerative joint diseases in humans.

Effect of Cu2O Content in Electrodeposited CuOx Film on Perovskite Solar Cells

Xu Miao,Shuo Wang,Wenhai Sun,Yu Zhu,Chen Du,Ruixin Ma,Chengyan Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.10

It is well known that the different proportions of CuO and Cu2O in CuOx hole transfer materials have a great influence on the hole transport property as well as the device performances of perovskite solar cells (PSCs). In this paper, we changed the content of Cu2O in the film by controlling the deposition voltage during electrodeposition, and the effects of different contents of Cu2O in the films on the device were investigated for the first time. It was found that the content of Cu2O in the film reached the highest point with the deposition voltage 0.5 V, such films have the highest transmittance and carrier mobility. After assembling the device, the power conversion efficiency (PCE) of the champion device reached 13.48% under a one-sun AM 1.5G (100 mW/cm2) illumination. Furthermore, the unpackaged device based on CuOx still retained over 75% PCE after being placed in the ambient condition (30–40% humidity, 20–30 ℃) for 500 h.

Extraction of valuable components from coal gangue through thermal activation and HNO3 leaching

Shuang Shao,Baozhong Ma,Chengyan Wang,Yongqiang Chen 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-

Coal gangue has the dual attributes of hazard and resource. With the increasing awareness of resourcesconservation and ecological sustainability, the high-value utilization of coal gangue has attracted activeattention. In this research, thermal activation followed by HNO3 leaching were performed to extract valuablecomponents from coal gangue. Firstly, the activation behavior and phase transformation mechanismduring thermal activation were revealed through the Gibbs free energy calculation and experimentalresearch. After activation, inert kaolinite was converted to active metakaolinite. Subsequently, thepotential-pH diagrams analyses confirmed that the strategy of extracting Al, Ga, and Li into the leachliquor while precipitating Fe into the leach residue was feasible. Meanwhile, systematic leaching experimentsshowed that 95.2% of Al, 56.4% of Ga, and 80.5% of Li were extracted, while only 2.1% of Fe wasdissolved at the optimal conditions. The leaching behavior of each component agreed well with the thermodynamicanalysis. Finally, the raw ore, activated product, and leach residue were analyzed via a suiteof characterization techniques. In contrast to the raw ore and activated product, the leach residue hadlarge BET surface area and high available Si content, and was a promising Si fertilizer source. This studyprovides a useful reference for the high-value utilization of coal gangue.

An effective method for directly extracting lithium from a-spodumene by activated roasting and sulfuric acid leaching

Yuqing Zhang,Baozhong Ma,Yingwei Lv,Chengyan Wang,Yongqiang Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-

The global trend toward electrification has encouraged lithium’s market position to grow prominently. Spodumene is the focus of lithium extraction owing to its abundant lithium resources. In this study, anovel lithium extraction method was proposed for a-spodumene by combining activated roasting andsulfuric acid leaching. First, the thermodynamics of the roasting process demonstrated that aspodumenewas converted into b-spodumene, which reacted with CaO to produce acid-solubleLiAlSiO4 and CaSiO3 concurrently. The addition of CaO reduced the melting temperature, which promotedthe structural transformation of b-spodumene and further acid leaching. Then, the influences of variousfactors on lithium extraction were investigated by a single-factor test. A lithium leaching yield of 96.18%was obtained under optimum conditions: 20% CaO, roasting temperature of 1200 C, holding time of1.5 h, H2SO4 concentration of 120 g/L, liquid–solid ratio of 7:1 mL/g, leaching temperature of 80 Cand leaching time of 1.5 h. Finally, Li entered into leach liquor by the action of sulfuric acid, and the maincomponents of the leach residue were silicate and calcium sulfate. Compared to the conventional acidapproach, this method has a higher lithium recovery and lower energy and acid consumption (decreaseby approximately 0.42 kg/ kg).

Strengthening extraction of lithium and rubidium from activated α-spodumene concentrate via sodium carbonate roasting

Huidong Zhou,Yubo Liu,Baozhong Ma,Chengyan Wang,Yongqiang Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

As a critical resource, lithium is necessary for the flourishing of clean energy as an upstream raw material. With the global popularity of lithium batteries and strict requirements for environmental protection, ashort, cost-effective lithium extraction process from a-spodumene was critical. In this paper, a novel processfor efficient and direct extraction of lithium from a-spodumene was proposed. The main contents ofthe process were sodium roasting, water quenching and strengthening leaching. Firstly, the thermodynamicbehavior of the roasting products was analyzed using Factsage 7.0 software. Subsequently, the factorsof lithium extraction were investigated by single-factor condition experiments. And the responsesurface methodology (RSM) was used to carry out the three-factor and three-level Box-Behnken experiments. The investigation revealed that a-spodumene reacted directly with Na2CO3 at high temperature toform Li2SiO3, NaAlSiO4, and Na2SiO3. The stable aluminosilicate structure in a-spodumene was destroyedby the combined effect of sodium roasting and water quenching, which played a significant role in therelease of lithium. In addition, the Na2CO3 dosage dominated the effect of lithium extraction, followedby roasting temperature and roasting time. Based on the model optimization results, the optimal roastingconditions were determined to be roasting at 1100 C for 30 min with the addition of 45% Na2CO3. Theextraction rates of Li and Rb were 95.9% and 90.3%, respectively, whereas those of Al was only 1.5%. This process provides a technological solution for the high-efficiency and synergistic extraction of valuableelements in a-spodumene.

Non-salt roasting mechanism of V–Cr slag toward efficient selective extraction of vanadium

Zhichao Yao,Qing Zhang,Ling Wang,Wenjuan Zhang,Baozhong Ma,Chengyan Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-

Developing a clean method for the sustainable utilization of reducing slag containing vanadium and chromium(V–Cr slag) is necessary, with the non-salt roasting method exhibiting considerable potential. Inthis study, we conducted a detailed analysis of the mechanisms driving non-salt roasting of the V–Cr slagby investigating phase transformations, valence transition, and redistribution of vanadium and associatedtransition elements. Based on our findings, we performed efficient selective extraction experimentsand revealed that spinel (Fe,Mn)(V,Cr)2O4, the carrier of vanadium, is converted to acid-soluble products,including VO2, Mg2V2O7, and Mn2V2O7, and acid-insoluble products, such as (Fe,Cr)2O3, TiO2, MnO2, andFe2TiO5 at a roasting temperature of 700 C; At roasting temperatures > 850 C, MnO2 is converted to halfMn2V2O7 and half (Fe,Cr,Mn)2O3. Vanadium is separated from Fe, Cr, Ti, Si, and half Mn via selective leaching. Under optimized conditions, the leaching efficiency of V reached 94.55%, and those of Fe, Cr, Ti, Si,and Mn were 0.71%, 0.50%, 0.44%, 0.23%, and 50%, respectively. This study provides a technical and theoreticalbasis for cleaner and safer utilization of V–Cr slag.

Phase transformation and roasting kinetics of cobalt-rich copper sulfide ore in oxygen atmosphere assisted by sodium sulfate

Xiang Li,Yubo Liu,Weijiao Yang,Baozhong Ma,Yongqiang Chen,Chengyan Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

The recovery rates of copper (99 %) and cobalt (93 %) could be significantly increased by adding sodiumsulfate in activated roasting of Cobalt-rich copper sulfide (CRCS). The mechanism and kinetic parametersof CRCS roasting with sodium sulfate addition were not clear. Thus, in this study, the thermal roastingkinetics of carrollite (the predominant cobalt occurrence mineral) in CRCS adding Na2SO4 with an airatmosphere was studied in detail by TG-DTG method. The apparent activation energy (E) and preexponentialfactor (A) were obtained via Flynn-Wall-Ozawa method (FWO) and Kissinger-Akahira-Sunose method (KAS) methods, where E values were 113.89 kJmol1 (KAS) and 120.87 kJmol1(FWO). The thermodynamic parameters of the roasting process were evaluated. The model function forthe carrollite reaction was determined via Malek analysis. The mechanism of sodium sulfate additionin CRCS roasting was studied. Results showed that the addition of sodium sulfate in activated roastingcan promote the transformation of carrollite mineral phase. The activation energy value of the oxidationprocess of carrollite decreases. From the kinetic point of view, the addition of sodium sulfate can promotethe activation roasting.