检索结果-南通市图书馆

Investigation on Pulverized Coal Combustion Behavior by Non-Isothermic Integral Thermogravimetry Method

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第8期18卷 1-8页

作者： QI Cheng-lin ZHANG jian-liang lin Xiang-hai LIU Qin-yuan WANG Xiao-liu School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The combustion process of pulverized coal was investigated by non-isothermic integral thermogravimetry. The thermogravimetry curves were fitted by the Coats-Redferm approximation function, and kinetic parameters and characteristic temperatures were obtained. The optimal mixing ratio and particle size can be ascertained. The characteristic temperature of pulverized coal can be obtained from the thermogravimetry curve, and the combustion of coal can be divided into homogeneous and heterogeneous combustion according to the differential thermal analysis curve. The activation energy of a single type of coal ranking from low to high is as follows： bituminous coal, meager-lean coal, and anthracite. In the first mixing method, with more low-price meager-lean coal B replacing high price anthracite A, the activation energy slightly decreases; with more bituminous coal replacing meager-lean coal, total tendency makes a declining of activation. In the later mixing method, with an increase in particle size, a declining activation energy can be seen in total tendency.

关键词： pulverized coal combustion themogravimetry kinetics mixed-coal granularity coal combustion

Digital signal acquisition system for complex nuclear reaction experiments

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第1期35卷 124-133页

作者： Wei-liang Pu Yan-lin Ye jian-ling Lou Jia-Hao Chen School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China Institute of Applied Physics and Computational Mathematics Beijing 100094China

A digital data-acquisition system based on XIA LLC products was used in a complex nuclear reaction experiment using radioactive ion beams.A flexible trigger system based on a field-programmable gate array(FPGA)parametrization was developed to adapt to different experimental sizes.A user-friendly interface was implemented,which allows converting script language expressions into FPGA internal control *** proposed digital system can be combined with a conventional analog data acquisition system to provide more *** performance of the combined system was veri-fied using experimental data.

关键词： Digital signal acquisition system Trigger Programmable logic Timestamp

中药内服方治疗毒蛇咬伤的用药规律的数据挖掘

在线全文

学校读者我要写书评

暂无评论

广州中医药大学学报 2024年第1期41卷 251-256页

作者：张松杰李典鸿蔡伟才吴庆湘林剑良梁满光广州中医药大学广东广州510405 广东省第二中医院广东广州510095

【目的】采用数据挖掘方法分析国内主要文献数据库及《中华医方》外科卷中有关治疗毒蛇咬伤的中药内服方,以探讨其潜在的组方用药规律,为基层治疗毒蛇咬伤提供参考。【方法】通过检索中国知网、维普、万方数据库中有关治疗毒蛇咬伤的中... 详细信息

【目的】采用数据挖掘方法分析国内主要文献数据库及《中华医方》外科卷中有关治疗毒蛇咬伤的中药内服方,以探讨其潜在的组方用药规律,为基层治疗毒蛇咬伤提供参考。【方法】通过检索中国知网、维普、万方数据库中有关治疗毒蛇咬伤的中药内服方,并查阅《中华医方》外科卷,筛选其中治疗毒蛇咬伤的古方。运用Excel软件提取方药的相关信息,采用R语言对中药的使用频率、性味归经、关联规则、聚类情况等进行分析。【结果】共得到治疗毒蛇咬伤内服方187首,涉及中药284味;使用频次居前15位的中药依次为半边莲、大黄、白芷、甘草、重楼、地黄、黄连、黄芩、金银花、赤芍、牡丹皮、白花蛇舌草、白茅根、车前草、半枝莲;治疗毒蛇咬伤方药的药味偏苦、辛、甘,药性偏寒,归经以归肝、肺经为主;关联规则分析及聚类分析得到以大黄、半边莲、重楼为基础的核心组方。【结论】中药治疗毒蛇咬伤以清热解毒为主,常在大黄、半边莲、重楼的基础上配以清热凉血、熄风止痉、清热利尿等药物。

关键词：毒蛇咬伤文献数据库《中华医方》内服方大黄半边莲重楼用药规律数据挖掘

Lipid metabolism, amino acid metabolism, and prostate cancer: a crucial metabolic journey

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2024年第2期26卷 123-134页

作者： lin Chen Yu-Xin Xu Yuan-Shuo Wang jian-liang Zhou School of Pharmacy Hangzhou Normal UniversityHangzhou 311121China Key Laboratory of Elemene Class Anti-Cancer Chinese Medicines Collaborative Innovation Center of Traditional Chinese Medicines of Zhejiang Province Hangzhou Normal UniversityHangzhou 311121China School of Pharmacy Guangxi Medical UniversityNanning530021China

Prostate cancer(PCa)is one of the most common malignancies in males worldwide,and its development and progression involve the regulation of multiple metabolic *** in lipid metabolism affect the proliferation and metastatic capabilities of PCa *** cells increase lipid synthesis and regulate fatty acid oxidation to meet their growth and energy ***,changes occur in amino acid metabolism in *** cells exhibit an increased demand for specific amino acids,and they regulate amino acid transport and metabolic pathways to fulfill their proliferation and survival *** changes are closely associated with disease progression and treatment response in PCa ***,a comprehensive investigation of the metabolic characteristics of PCa is expected to offer novel insights and approaches for the early diagnosis and treatment of this disease.

关键词： amino acid metabolism lipid metabolism metabolic pathways prostate cancer treatment strategies

Microstructure evolution and mechanical properties of high-boron steel with different ratios of boron and carbon

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2022年第2期19卷 169-176页

作者： Ming-chen Ma Chao-qing Luo Si-min Chen Hong-qun Tang Shan-shan Hu Yu-mei Zhou jian-lin liang Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured Materials Center of Ecological Collaborative Innovation for Aluminium Industry in GuangxiSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China School of Mechanical Engineering Guangxi UniversityNanning 530004China School of Mechatronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Boron and carbon contents are the main factors influencing the properties of high-boron *** this study,experimental samples with different boron-to-carbon ratios(%B/%C)were *** microstructures of the different samples were observed,and their hardness,bending strength,and impact toughness were *** show that the main microstructures in the investigated high-boron steel samples are the eutectic Fe_(2)B structure with a fishbone shape and the ternary peritectic Fe_(3)(C,B)structure with a chrysanthemum *** the boron content is 2.5wt.%and the carbon content is 0.43wt.%(i.e.,%B/%C=5.82),the overall mechanical properties of the alloy are the *** alloy's hardness,bending strength and impact toughness reach their maximums,which are 67.3 HRC,1,267.36 MPa and 6.19 J·cm^(-2),*** optimized alloy is compared with conventional materials exhibiting excellent wear resistance(namely,high-manganese steel and high-chromium cast iron)through two-body and three-body abrasion *** wear resistance of this high-boron steelinvestigated in this work is found to be superior to those of the more common materials.

关键词： high-boron steel boron and carbon contents wear resistance microstructure mechanical properties

Analysis and experimental study on resistance-increasing behavior of composite high efficiency autonomous inflow control device

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 1290-1304页

作者： liang-liang Dong Yu-lin Zhang School of Mechatronic Engineering Southwest Petroleum UniversityChengdu610500SichuanChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Oil and Gas Equipment Technology Sharing and Service Platform of Sichuan ProvinceChengdu610500SichuanChina

Bottom water coning is the main reason to reduce the recovery of horizontal bottom water reservoir. By water coning, we mean the oil-water interface changes from a horizontal state to a mound-shaped cone and breaks through to the wellbore. Autonomous inflow control device(AICD) is an important instrument maintain normal production after bottom water coning, however, the resistance increasing ability of the swirl type AICD is insufficient at present, which seriously affects the water control effect. Aiming this problem, this paper designs a multi-stage resistance-increasing and composite type AICD. The separation mechanism of oil-water two phases in this structure, the resistance form of oil-water single phase and the resistance-increasing principle of water phase are analyzed. Establishing the dual-phase multi-stage separation and resistance-increasing model, and verified by measuring the throttling pressure drop and oil-water volume fraction of the AICD, it is found that the composite type AICD has the effect of ICD and AICD at the same time, which can balance the production rate of each well section at the initial stage of production, delay the occurrence of bottom water coning. In the middle and later stages of production, water-blocking can be effectively increased to achieve water control and stable *** structural sensitivity analysis, the influence law of various structural parameters on the water control performance of composite AICD was obtained. The simulation calculation results show that,compared with the existing swirl type AICD, composite AICD has higher sensitivity to moisture content,the water phase throttling pressure drop is increased by 4.5 times on average. The composite AICD is suitable for the entire stage of horizontal well production.

关键词： Water control Flow separation Flow resistance-increasing AICD device Simulation and experiment

A new interacting capillary bundle model on the multiphase flow in micropores of tight rocks

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 1099-1112页

作者： Wen-Quan Deng Tian-Bo liang Wen-Zhong Wang Hao Liu Jun-lin Wu Fu-jian Zhou National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China

Surfactants are widely used in the fracturing fluid to enhance the imbibition and thus the oil recovery rate. However, current numerical models cannot capture the physics behind capillary imbibition during the wettability alteration by surfactants. Although the interacting capillary bundle(ICB) model shows potential in characterizing imbibition rates in different pores during wettability alteration, the existing ICB models neglect the influence of wettability and viscosity ratio on the imbibition behavior, making it difficult to accurately describe the oil-water imbibition behavior within the porous media. In this work,a new ICB mathematical model is established by introducing pressure balance without assuming the position of the leading front to comprehensively describe the imbibition behavior in a porous medium under different conditions, including gas-liquid spontaneous imbibition and oil-water *** the pore size distribution of a tight rock is known, this new model can predict the changes of water saturation during the displacement process in the tight rock, and also determine the imbibition rate in pores of different sizes. The water saturation profiles obtained from the new model are validated against the waterflooding simulation results from the CMG, while the imbibition rates calculated by the model are validated against the experimental observations of gas-liquid spontaneous imbibition. The good match above indicates the newly proposed model can show the water saturation profile at a macroscopic scale while capture the underlying physics of the multiphase flow in a porous medium at a microscopic scale. Simulation results obtained from this model indicate that both wettability and viscosity ratio can affect the sequence of fluid imbibition into pores of different sizes during the multiphase flow, where less-viscous wetting fluid is preferentially imbibed into larger pores while more-viscous wetting fluid tends to be imbibed into smaller pores. Fur

关键词： Imbibition Multiphase flow Tight rock Interacting capillary bundle model Wettability

Processing of a low-costγ-γ'NiPtAl coating with improved oxidation resistance

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第6期43卷 2832-2841页

作者： Yan jiang liang-liang Wei jian He Hong-Bo Guo School of Materials Science and Engineering Beihang UniversityBeijing 100191China Key Laboratory of High-Temperature Structural Materials and Protective Coatings Ministry of Industry and Information TechnologyBeihang UniversityBeijing 100191China

A novelγ-γ'(Ni solid solution—Ni_(3)Al)NiPtAl coating was produced on advanced single-crystal(SC)superalloy N5 by electroplating of a thin Pt coating with~3μm in thickness followed by heat treatment at 1000℃in *** comparison,a traditionalγ-γ'NiPtAl coating was also produced by electroplating of a thick Pt coating with~6μm in thickness followed by heat treatment at 1100℃in *** novel coating has a mass gain of~0.5 mg·cm^(-2)after 100 h 1-h cyclic oxidation at 1150℃,showing better oxidation resistance than the traditional *** oxide scale mostly consisting ofα-Al_(2)O_(3)grew on the novel coating because the element Cr from the SC alloy substrate contributes to the formation ofα-Al_(2)O_(3).Pt content in the novel coating has significant effect on the oxidation *** optimized Pt content in the coating is about 16 at%,which is helpful to reduce the diffusion of harmful elements from the substrate into the coating but also to reduce the cost of the coating.

关键词： γ-γ'NiPtAl coating Platinum Oxidation Al_(2)O_(3) Superalloy

Energy spectrum computed tomography multi-parameter imaging in preoperative assessment of vascular and neuroinvasive status in gastric cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第8期16卷 2511-2520页

作者： Jing Wang jian-Cheng liang Fa-Te lin Jun Ma Department of Radiology Pingluo County People's HospitalShizuishan 753400Ningxia Hui Autonomous RegionChina Department of Gastrointestinal Surgery Jiangsu Provincial People's HospitalNanjing 210029Jiangsu ProvinceChina

BACKGROUND Vascular and nerve infiltration are important indicators for the progression and prognosis of gastric cancer(GC),but traditional imaging methods have some limitations in preoperative *** recent years,energy spectrum computed tomography(CT)multiparameter imaging technology has been gradually applied in clinical practice because of its advantages in tissue contrast and lesion detail *** To explore and analyze the value of multiparameter energy spectrum CT imaging in the preoperative assessment of vascular invasion(LVI)and nerve invasion(PNI)in GC *** Data from 62 patients with GC confirmed by pathology and accompanied by energy spectrum CT scanning at our hospital between September 2022 and September 2023,including 46 males and 16 females aged 36-71(57.5±9.1)years,were retrospectively *** patients were divided into a positive group(42 patients)and a negative group(20 patients)according to the presence of LVI/*** CT values(CT40 keV,CT70 keV),iodine concentration(IC),and normalized IC(NIC)of lesions in the upper energy spectrum CT images of the arterial phase,venous phase,and delayed phase 40 and 70 keV were measured,and the slopes of the energy spectrum curves[K(40-70)]from 40 to 70 keV were *** Core Tip:To investigate the application value of multiparameter energy spectrum computed tomography(CT)imaging in the preoperative assessment of vascular and nerve infiltration in patients with gastric cancer(GC).The imaging data of GC patients were retrospectively analyzed to evaluate the accuracy and sensitivity of CT for identifying and quantifying vascular and nerve infiltration and for comparison with postoperative pathological *** purpose of this study was to verify the clinical feasibility and potential advantages of multiparameter energy spectrum CT imaging in guiding preoperative diagnosis and treatment decision-making and to provide a new imaging basis for improving the diagnostic accuracy

关键词： Tomography X-ray computer Energy spectrum computed tomography Gastric cancer Vascular invasion Nerve invasion Cross-sectional study