Zhanguo Zhu  Feifeng Zheng  Chengbin Chu 《国际生产研究杂志》2017,55(1):296-312

Motivated by the behavioral phenomena that occur while human operators are carrying out tasks, we study multitasking scheduling problems with a rate-modifying activity. In the problems, the processing of a selected task suffers from interruptions by other tasks that are available but unfinished, and the human operators regularly engage rest breaks during work shifts allowing them to recover or mitigate some of the negative effects of fatigue. The objectives are to respectively minimize: makespan, total completion time, maximum lateness, and due-date assignment related cost by determining when to schedule the rate modifying activity and the optimal task sequence in the presence of multitasking. Scheduling models and algorithms are proposed to solve the problems. The numerical examples are presented to illustrate the theorems and algorithms.  相似文献   

    

Mengnan Guo  Shiyu Liu  Manman Wang  Yifei Lv  Jialei Shi  Yuan Zeng  Jiannong Ye  Qingcui Chu 《Journal of the science of food and agriculture》2020,100(1):301-307

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Yusong Sheng  Wenxian Ji  Yanmeng Chu  Yue Ming  Anyi Mei  Yue Hu  Yaoguang Rong  Hongwei Han 《Solar RRL》2020,4(9)

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Lei Zhang  Haitao Zhang  Xiang Chu  Fangyan Liu  Chunsheng Guo  Weiqing Yang 《ENERGY & ENVIRONMENTAL MATERIALS》2020,3(3):421-428

Although the synthesis of novel nanostructured metal sulfides has been well established, further size‐controllable optimization is still valuable to enhance their performance for various applications. Herein, a self‐template method to size‐controllably synthesize the hollow NiCo₂S₄ nanospheres is reported. Uniformly monodisperse NiCo precursors with diameter widely ranging from 97 to 550 nm are controllably synthesized and subsequently transformed into hollow NiCo₂S₄ nanospheres through in situ sulfidation. Smaller nanoparticles' diameter results in the hollow NiCo₂S₄ nanospheres larger surface area and thinner shell thickness and hence provides much more electrochemical active sites as well as facilitate the ion and electron transfer. Consequently, the hollow NiCo₂S₄ nanospheres—used as the electrode materials in supercapacitors—achieve 19% enhancement of specific capacity from 484.8 to 575.1 C g⁻¹ through lowering the 42.5% diameter of hollow NiCo₂S₄ nanospheres from 407 to 234 nm. Moreover, the hollow NiCo₂S₄ nanospheres with 234 nm diameter exhibit superior rate capacity indicated by 49% capacity retention from 1 to 50 A g⁻¹ and excellent cycling stability (77% after 2000 cycles). Furthermore, this method is a potentially general strategy in the size‐controllable synthesis of the metal sulfides hollow nanostructures and results in the remarkable electrochemical applications.  相似文献   

Isobavachalcone ameliorates diabetic nephropathy in rats by inhibiting the NF-κB pathway     

Wen-hong Dong  Qiang-qiang Chu  Shang-quan Liu  Da-tong Deng  Qian Xu 《Journal of Food Biochemistry》2020,44(9):e13405

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Yi Gan  Hong Chen  Xian-Rong Zhou  Ling-Ling Chu  Wan-Ting Ran  Fang Tan  Xin Zhao 《Journal of Food Biochemistry》2020,44(11):e13495

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Jun Tong  Wei Li  Hai‐Chu Chen  Ling‐Cao Tan 《大分子材料与工程》2020,305(8)

Expanded graphite (EG) is introduced into poly(vinylidene fluoride) (PVDF) by melt mixing extrusion with water injection. The results demonstrate that the unfunctionalized EG in composite prepared with water injection exbibits better dispersion than that in the one prepared without water injection due to the promoting role of water during extrusion. Thus, the PVDF/EG composite with loading of 4 wt% prepared by water‐assisted mixing extrusion (WAME) exhibits electrical conductivity of about three orders of magnitude higher than the neat PVDF and one order of magnitude higher than the one prepared without water injection. Comparing to the neat PVDF, the thermal conductivity of the composites prepared with and without water injection is increased by 101.5% and 75.0%, respectively. The introduced EG leads to increased Young’s modulus and tensile strength especially for the composite prepared by WAME. The present work indicates that WAME can promote the dispersion of EG in PVDF matrix without any extra functionalization.  相似文献   

    

Dr. Xin-Yi Chu  Dr. Hong-Yu Zhang 《Chembiochem : a European journal of chemical biology》2020,21(22):3161-3168

Due to their early origin and extreme conservation, cofactors are valuable molecular fossils for tracing the origin and evolution of proteins. First, as the order of protein folds binding with cofactors roughly coincides with protein-fold chronology, cofactors are considered to have facilitated the origin of primitive proteins by selecting them from pools of random amino acid sequences. Second, in the subsequent evolution of proteins, cofactors still played an important role. More interestingly, as metallic cofactors evolved with geochemical variations, some geochemical events left imprints in the chronology of protein architecture; this provides further evidence supporting the coevolution of biochemistry and geochemistry. In this paper, we attempt to review the molecular fossils used in tracing the origin and evolution of proteins, with a special focus on cofactors.  相似文献   

    

Liqiong Luo  Bo Jin  Zuohu Chai  Qiong Huang  Shijin Chu  Rufang Peng 《Propellants, Explosives, Pyrotechnics》2020,45(6):880-888

The effects of various aniline stabilizers on the thermal stability of nitrocellulose (NC) were investigated via isothermal thermal decomposition dynamics. The pressure-time curves of NC/stabilizer composites were found to have a distinct inflection point, which was not observed on the pressure-time curves of NC. The effects of stabilizers on the isothermal thermal decomposition kinetics of NC were evaluated using Arrhenius equation and model-fitting method, and the effect of stabilizers on the storage time of NC was estimated using Berthelot equation. Results showed that the activation energy of NC/MNA, NC/ENA, NC/i-PNA, and NC/n-BNA before the inflection point were 162.9, 153.3, 147.4, and 150.6 kJ mol⁻¹, respectively, which were significantly increased compared with that of pure NC (144.7 kJ mol⁻¹). Furthermore, the time required for the decomposition extent of NC/MNA, NC/ENA, NC/i-PNA, and NC/n-BNA to reach 0.1 % were 24.9, 11.2, 16.7, and 11.2 years, respectively, at 298.15 K, which was longer than that required of NC (10.6 years). UV-vis revealed that the stabilizers were almost consumed when the NC/stabilizer thermal decomposition pressure-time curve reached the inflection point. Based on the above results, the stability order was MNA>i-PNA>ENA>n-BNA as the criterion for time of the inflection point.  相似文献   

    

Jie Chen  Na Chu  Miao Zhao  Fan-Long Jin  Soo-Jin Park 《应用聚合物科学杂志》2020,137(48):49592

Epoxy resin, which is extensively used in civil and industrial applications, shows excellent comprehensive performance, especially as a polymer matrix used in fiber-reinforced composites. A thermal latent initiator, used as an epoxy curing agent, has high storage stability and is widely applied in the preparation of epoxy-based blends and fiber-reinforced composites. In this review, the basic properties of epoxy resins and commonly used curing agents are discussed while progress on the synthesis of thermal latent initiators is reviewed in detail. Moreover, the curing mechanisms, thermal stability, and mechanical properties of epoxy resins with thermal latent initiators are also discussed.  相似文献