Research on electro-hydraulic composite drive winch and energy recovery system for mobile crane

Owing to the high power consumption and limited control precision of traditional hydraulic drive winch systems, this study proposes hydraulic and electric-type energy recovery systems. The accumulator used in the hydraulic type has low energy density, which makes it difficult to store a large amount of energy. Meanwhile, the electric motor/generator used in the electric type cannot solve the secondary slip because of oil leakage, which leads to low controllability and high-power consumption under near-zero speed and high torque conditions. Thus, based on electric construction machinery with high-pressure, energy-dense electric energy storage units, this study proposes an electro-hydraulic composite drive winch and energy recovery system and control strategy for mobile cranes. Considering the good control characteristics of the electric motor/generator and the high-power density of the hydraulic accumulator, this hydroelectric composite drive and energy recovery system may solve the secondary sliding challenge and ensure large torque output at near-zero speed. A simulation model of the mobile crane is established to verify the feasibility of the proposed system and control strategy. The research results showed that the system is more efficient at recovering energy when the weight is lowered by a greater distance

Effect of anlotinib combined with camrelizumab on clinical efficacy and short-term prognosis in male patients with advanced gastric cancer

This study aimed to investigate the effects of combining anlotinib with camrelizumab on clinical efficacy and short-term prognosis in male patients with advanced gastric cancer. A total of 88 male patients admitted to our hospital between May 2019 and March 2022 with advanced gastric cancer were included and randomly assigned to Group A (treated with anlotinib alone) or Group B (treated with anlotinib combined with camrelizumab) using the envelope method, with 44 patients in each group. Their clinical efficacy, vascular endothelial growth factor (VEGF) and programmeddeath-1 (PD-1) expression on Cluster of differentiation 4+ (CD4+) and cytotoxic Tlymphocyte (CD8+ T) cells in peripheral blood, immune function parameters, tumor markers, incidence of adverse reactions and survival time were compared. The results showed that the patients in Group B had significantly higher objective response rate (ORR) and disease control rate (DCR), superior PD-1 in VEGF, CD4+ T cells and CD8+ T cells, significantly improved immune function indicators and tumor markers (Carbohydrate antigen 50 (CA50), carcinoembryonic antigen (CEA) and cytokeratin 19 fragment (CYFRA21-1)), and significantly longer progression-free survival and overall survival than Group A. In addition, no significant difference in the incidence of adverse reactions between the two groups was observed. Therefore, the combination of anlotinib and camrelizumab could be a clinically beneficial treatment option and recommended for male patients with advanced gastric cancer as it can effectively control tumor progression, improve clinical efficacy and prolong their survival without increasing adverse reactions

Sustainable development of coastal cities through control of land subsidence: activities of IGCP Project 663 in Jakarta

The awareness on the importance that land subsidence plays on coastal processes at the regional scale is increased over the last two decades, and it clearly appears that land subsidence can contribute primarily to the relative sea level rise affecting coastal zones. Jakarta is one of the cities mostly affected by the combination of sea-level rise and land subsidence. In this paper, the activities carried out in Jakarta under the umbrella of the IGCP Project 663 were presented, and the possible measures and best practices mitigating land subsidence for the research associates and potential stakeholders were provided, with which can serve as inspiration for authorities and communities facing land subsidence. Meanwhile, major achievements of IGCP 663 in Jakarta were summarized and introduced, including dissemination session, scientific session and field trips. Specifically, major advances on coastal subsidence studies regarding the effect of relative sea level rise, subsidence mapping, monitoring and simulation, as well as the support of policy making are highlighted and summarized

Sustainable development of coastal cities through control of land subsidence: Activities of IGCP Project 663 in Jakarta

The awareness on the importance that land subsidence plays on coastal processes at the regional scale is increased over the last two decades, and it clearly appears that land subsidence can contribute primarily to the relative sea level rise affecting coastal zones. Jakarta is one of the cities mostly affected by the combination of sea-level rise and land subsidence. In this paper, the activities carried out in Jakarta under the umbrella of the IGCP Project 663 were presented, and the possible measures and best practices mitigating land subsidence for the research associates and potential stakeholders were provided, with which can serve as inspiration for authorities and communities facing land subsidence. Meanwhile, major achievements of IGCP 663 in Jakarta were summarized and introduced, including dissemination session, scientific session and field trips. Specifically, major advances on coastal subsidence studies regarding the effect of relative sea level rise, subsidence mapping, monitoring and simulation, as well as the support of policy making are highlighted and summarized

Automatic Shift Control of an Electric Motor Direct Drive for an Electric Loader

Traditional loaders with engines present the drawbacks of high energy consumption and poor emissions performance. The usage of an electric motor instead of an engine in an electric loader can effectively improve energy efficiency and emissions. The loader is mainly used in the earthwork construction of unstructured roads. Compared to the automobile, during the working process of the loader, the load fluctuates violently, and the vibration is serious. A large torque range during operation, a wide speed range during transfer, and frequently switching gears to ensure power are required by the loader. Therefore, the automatic shift control strategy for an automobile cannot be well applied to the loader directly. In this paper, a novel distributed electric motor-driven loader in which the walking drive system and the hydraulic system is decoupled is studied. The shift rule of the electric loader is also studied. A comprehensive automatic shift control strategy considering power and economy is proposed. Simulations are carried out to verify the feasibility of the proposed control strategy. The results show that under the “V” cycle operation condition of the loader, the shift rule meets the control requirements and the shift effect is obvious and reasonable. In terms of transfer conditions, the proposed control strategy yields ideal power performance and energy savings

studiesontherolesofvanadylsulfateandsodiumnitriteincatalyticoxidationofbenzylalcoholwithmolecularoxygen

An efficient catalytic system consisting of vanadyl sulfate/sodium nitrite was disclosed previously for the oxidation of benzylic alcohols into aldehydes with molecular oxygen. However, the roles of catalyst components were not investigated. In this paper, we examined catalytic oxidation of benzyl alcohol as a model reaction, especially by infrared spectroscopy. The role of each component is discussed including nitrite, vanadyl, sulphate, and water. Sodium nitrite could be converted into nitrate and nitric acid. The vanadium(IV) could be smoothly oxidized into vanadium(V) under mild and acidic conditions without any organic ligands. The transformation of sulfate and bisulfate, the cessation of an induction period, and the oxidation of benzyl alcohol were closely interrelated. The multiple roles of water are discussed, including reduction of the induction period, participation in redox cycles of nitric compounds, deactivation of vanadium, and as a byproduct of oxidation. This study contributes to further development of aerobic oxidation using vanadium based catalysts