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Macro-and micro-mechanical response and damage mechanism of sandstone under high-temperature conditions

International Journal of Mining Science and Technology 2025年第2期35卷 265-274页

作者： Laiwei Wu Yanli Huang Junmeng Li Guiyuan Wang Yingshun Li Xiaotong Li Junzhi Chen Chuning ji State Key Laboratory of Coal Exploration and Intelligent Mining School of MinesChina University of Mining and TechnologyXuzhou 221116China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The thermal effects of coal combustion considerably influence the physical and chemical properties,structural characteristics, and stability of rocks, posing a serious threat to the safety of coal mining operations. In this study, the impacts of temperature on the physical and chemical characteristics(i.e., mineral phase, microstructure, and mechanical strength) of sandstone were investigated by employing experimental methods, including microstructural analysis, uniaxial acoustic emission(AE), and nuclear magnetic resonance(NMR). The results indicate that temperature alters the mineral phase and the pore characteristics, and these two factors jointly affect the mechanical properties of sandstone. The influence of temperature on the mechanical strength of sandstone is categorized into low-temperature strengthening and high-temperature damage, with a threshold temperature identified at 600 ℃. The lowtemperature strengthening effect encompasses both pore strengthening and mineral phase strengthening, while the high-temperature damage effect primarily results from pore damage. As the experimental temperature rises, both the number of AE events and the AE energy transition from a surge in the postpeak failure stage to a stepwise increase during the loading process. This transition implies that the failure mode of the sandstone sample evolves from brittle failure to tensile failure.

关键词： Thermal effects Mineral phase Pore structure Acoustic emission energy Microscopic morphology

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Ghost species form an important component of the epiphytic lichens in temperate forests

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Forest Ecosystems 2025年第01期 20-28页

作者： Jan Vondrák ji?í Ko?nar Stanislav Svoboda Zdeněk Palice Jaroslav ?oun ji?í Kubásek Pavel Ríha ji?í Malí?ek Jan Rydlo Jeňyk Hofmeister Institute of Botany of the Czech Academy of Sciences Department of Botany Faculty of ScienceUniversity of South Bohemia Museum of Dr.Bohuslav Horák in Rokycany Branch of Museum of West Bohemia Department of Experimental Plant Biology Faculty of ScienceUniversity of South Bohemia ReDpeupbalritcment of Forest Ecology Faculty of Forestry and Wood SciencesCzech University of Life Sciences in Prague Global Change Research Institute of the Czech Academy of Sciences

Sequencing of environmental samples has great potential for biodiversity research, but its application is limited by the lack of reliable DNA barcode databases for species identifications. Such a database has been created for epiphytic lichens of Europe, allowing us to compare the results of environmental sequencing with standard taxonomic surveys. The species undetected by taxonomic surveys(what we term the ghost component) amount to about half of the species actually present in hectare plots of Central European forests. Some of these, which currently occur only as diaspores or weakly developed thalli, are likely to be favoured in the course of global change. The ghost component usually represents a larger fraction in managed forests than in old-growth unmanaged forests. The total species composition of different plots is much more similar than suggested by taxonomic surveys alone. On a regional scale, this supports the well-known statement that“everything is everywhere,but, the environment selects”.

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Unraveling the mechanism of action of Shangxia Liangji formula for treating insomnia:a metabolomics and network pharmacology approach

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Traditional Medicine Research 2025年第2期10卷 16-29页

作者： Xia-jie Quan Hao Liang Yong-hong Tang Li jiang Xiong-Ying ji Feng-Ying Zhang Ping Zhang Bo Ouyang Department of Information The Affiliated Nanhua HospitalHengyang Medical SchoolUniversity of South ChinaHengyang 421002China Department of Neurology The Affiliated Nanhua HospitalHengyang Medical SchoolUniversity of South ChinaHengyang 421002China Department of Gastroscopy The Affiliated Nanhua HospitalHengyang Medical SchoolUniversity of South ChinaHengyang 421002China Department of Traditional Chinese Medicine The Affiliated Nanhua HospitalHengyang Medical SchoolUniversity of South ChinaHengyang 421002China

Background:Insomnia is a prevalent clinical condition and Shangxia Liangji formula(SXLJF)is a well-established method of ***,the specific mechanism of action of SXLJF remains ***:The mouse model of insomnia was established by intraperitoneal injection of ***-two mice were randomly divided into a negative control group,model group,SXLJF group(18.72 g/kg/day),and positive control group(diazepam,2 mg/kg)and treated with the corresponding drugs for 7 consecutive *** open field test and pentobarbital-induced sleeping test were ***-MS-based untargeted metabolomics and network pharmacology were applied to explore the potential targets of SXLJF for treating ***,key targets were validated using ***:Behavioral tests demonstrated that SXLJF reduced the total distance,average velocity,central distance,and sleep latency,and prolonged sleep *** and network pharmacology revealed potential targets,signaling pathways,metabolic pathways,and metabolites associated with the anti-insomnia effects of ***,tyrosine hydroxylase(TH)and tyrosine metabolism emerged as crucial metabolic pathways and targets,***-qPCR results supported the role of TH in the mechanism of SXLJF in treating ***:In conclusion,TH and tyrosine metabolism may represent significant targets and pathways for SXLJF in treating insomnia.

关键词： Shangxia Liangji formula insomnia metabolomics network pharmacology tyrosine hydroxylase tyrosine metabolism

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A Continued Fight China’s 2024 anti-corruption achievements

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Beijing Review 2025年第2期68卷 32-33页

作者： ji jing 不详

China’s anti-graft campaign maintained its powerful momentum throughout 2024,achieving solid *** from the Central Commission for Discipline Inspection(CCDI)of the Communist Party of China(CPC)and the National Commission of Supervision(NCS)have revealed that in the first three quarters of 2024,discipline inspection and supervision authorities nationwide filed approximately 642,000 cases.

关键词： nationwide maintained filed

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Bringing Healthcare Closer

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Beijing Review 2025年第3期68卷 36-37页

作者： ji jing 不详

Increasing accessibility,better catering to the needs of seniors and offering more personalized forms of care have all been major trends in the development of China’s healthcare industry in recent *** achieve these goals,major apps and online platforms,as well as individual hospitals,have been using technology to increase the availability and efficiency of in-home nursing *** a result of their efforts,calling a nurse to your doorstep is now as easy as ordering food delivery.

关键词： offering nurse goals

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Regional AgendasLocal Two Sessions set the course for development

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北京周报（英文版） 2025年第5期68卷 26-27页

作者： ji jing

The annual local Two Sessions,one session of the people's congress and one of the commiupttee of the Chinese People's Political Consultative Conference(CPPCC)in each provincial-level region,serve as a crucial window for observing the economic and social development of various *** mid-to-late January,provincial-level Two Sessions have been convened intensively,unveiling the blueprint for local economic and social development this year.

关键词： regional agendas

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Interfacial behaviors between ZG13Cr9Mo1VNbN stainless steel and chromite sand

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Journal of Iron and Steel Research International 2025年第1期32卷 129-143页

作者： Shi-sen Li Xi-min Zang ji-lin Chen jie Yang Yu-an jing Zhi-ying Wang Ling-zhong Kong School of Materials and Metallurgy University of Science and Technology LiaoningAnshan114051LiaoningChina School of Material Science and Engineering Shenyang University of TechnologyShenyang110870LiaoningChina Central Iron and Steel Research Institute Co. Ltd.Beijing100081China Xingtai Iron and Steel Co. Ltd.Xingtai054027HebeiChina

To elucidate the formation mechanisms of burn-on sand and metal penetration during sand casting,some laboratory experiments were carried out at different temperatures(1813,1833,1853,and 1873 K)and holding time(20,40,60,and 90 min)to simulate the interaction between ZG13Cr9Mo1VNbN stainless steel and chromite *** results demonstrate that the defects primarily consist of a mixture of the liquid phase,chromite,and *** main components of the liquid phase are SiO_(2),MnO,MgO,Cr_(2)O_(3),FeO,and Al_(2)O_(3),and the formation of Cr_(2)O_(3)through interfacial redox reactions has been *** presence of a liquid phase plays a pivotal role in influencing burn-on sand and metal *** reactions are prioritized,with burn-on sand maintaining a predominant *** the liquid phase quantity within the sand escalates,there is a corresponding incremental rise in the incidence of metal *** a minimal presence of the silicon element in steel can impact the liquid phase’s ***,the decomposition or dissolution of chromite sand is a significant factor in the development of burn-on sand and metal ***,a thorough investigation into the conditions and contributing factors of this phenomenon is essential for its effective management and mitigation.

关键词： Heat-resistant steel Chromite sand Interfacial reaction Burn-on sand Metal penetration Temperature Holding time

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TRACKS OF PROGRESS

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Beijing Review 2025年第4期68卷 12-15页

作者： ji jing 不详

Huang Yue,who works in Hezhou,a city in south China's Guangxi Zhuang Autonomous Region,opted for a change in her journey home to Changbaishan in jilin Province in northeast China,a distance of 3,000 *** of her usual f... 详细信息

关键词： PROGRESS northeast jilin

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Prophylactic hyperthermic intraperitoneal chemotherapy in patients with locally advanced gastric cancer after curative surgery:Final results of a phase Ⅱ trial

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Chinese Journal of Cancer Research 2025年第01期 66-72页

作者： Biao Fan Hao Su Lingqian Wang Xin ji Yinan Zhang Ziyu jia ji Zhang Zhaode Bu Xiaojiang Wu Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing) Gastrointestinal Cancer Center Peking University Cancer Hospital & Institute State Key Laboratory of Holistic Integrative Management of Gastrointestinal Cancers Beijing Key Laboratory of Carcinogenesis and Translational Research Gastrointestinal Cancer Center Peking University Cancer Hospital & Institute

Objective: The trial was designed to evaluate the efficacy of prophylactic hyperthermic intraperitoneal chemotherapy(HIPEC) with cisplatin for patients with locally advanced gastric cancer(LAGC).Methods: Between March 2015 and November 2016, a phase II clinical trial was performed. Fifty consecutive patients with LAGC were randomly assigned to two groups: the experimental group(radical gastrectomy + HIPEC with cisplatin + adjuvant chemotherapy) and the control group(radical gastrectomy + adjuvant chemotherapy).Survival rates were closely ***: The 5-year overall survival(OS) rate of all patients was 80.0%. The 5-year OS rate in the experimental group was lower than that in the control group, at 75.8% and 88.2%, respectively, with no statistical *** addition, 5-year recurrence-free survival(RFS) rates of patients who underwent HIPEC or not were also 75.8%and 88.2%, respectively. In the multivariate analysis, only pT stage [risk ratio(RR)=7.079, P=0.018] was significantly associated with prognosis. The most common recurrence pattern was peritoneal recurrence in both groups. The experimental group had a lower incidence of peritoneal recurrence than the control group with no statistical ***: This trial clearly revealed that prophylactic HIPEC with cisplatin neither decrease the risk of peritoneal recurrence nor improve the prognosis of patients with LAGC. Thus, HIPEC with cisplatin is not recommended as a prophylactic treatment for peritoneal recurrence of LAGC after radical gastrectomy.

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On-orbit attitude planning for Earth observation imaging with star-based geometric calibration

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Science China(Technological Sciences) 2025年第2期68卷 243-256页

作者： Di HUANG Zhifu WANG jianya GONG Haoran ji Institute of Aerospace Science and Technology School of Remote Sensing and Information EngineeringWuhan UniversityWuhan 430072China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingSchool of Remote Sensing and Information EngineeringWuhan UniversityWuhan 430072China National Key Laboratory of Air-based Information Perception and Fusion Luoyang 471009China Intelligent Game and Decision Laboratory Beijing 100071China

To improve the quality of remote sensing images,a novel on-orbit attitude planning method for Earth observation imaging with star-based geometric calibration is presented in this *** traditional imaging processes,the proposed method includes both pre-calibration and post-calibration stages to enhance the accuracy of satellite geometric positioning.A multiple-constraint attitude planning algorithm was developed to ensure star-based calibration,wherein the satellite camera and star sensors simultaneously capture the images of *** integration of cameras and multiple star sensors enables effective attitude *** the Earth imaging stage,a fast on-orbit attitude planning algorithm was developed to determine the satellite attitude and the optimal imaging times for ground *** with existing methods,the fast on-orbit attitude planning algorithm can significantly reduce computational time and resource consumption via initial value selection and *** demonstrate the effectiveness of the proposed attitude planning method,which was successfully applied to Wuhan 1 satellite.

关键词： attitude planning Earth observation imaging geometric calibration attitude constraints

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