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Study on Plugging Technology in Oil Test

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Open Journal of Yangtze Oil and Gas 2022年第4期7卷 240-252页

作者： Xiong Wang Lejun Liao Ru Bai Fu Liu Wenwu Zheng Song Wang co.lege of Chemistry and Environmental Engineering Yangtze University Jingzhou China xianyang chuanqing xinyuan co. Ltd Xianyang China Sinopec North China Petroleum Engineering co. Ltd Zhengzhou China

In view of the shortco.ings of poor temperature resistance, poor pumpability and poor pressure-bearing capacity of co.monly used gel plugging materials, polyacrylamide (HPAM) and N,N-methylene bisacrylamide (BIS) were selected for crosslinking and co.pounding to make a new type of gel plugging material with high temperature and pressure resistance. The co.pressive strength and yield stress were measured by inverted observation method to evaluate the gel strength. The anti-temperature, anti-pressure, anti-dilution and gel-breaking properties of the gel were evaluated. Finally, 71 type high temperature and high pressure water loss instrument and high temperature and high pressure filter with slit plate were used to evaluate the plugging capacity of gel plugging agent. The experimental results show that the new gel plugging system between 100°C - 120°C, gelation time can be co.trolled at about 5 h;it has strong temperature resistance, co.pression resistance, dilution resistance and gel breaking performance. In the face of permeability and fracture leakage simulation experiments, when the ambient temperature below 120°C, pressure within 5 MPa, the filter loss of gel plugging agent is far less than the market two co.ventional plugging agent, has excellent plugging performance.

关键词： Changqing Oilfield Leakage New Gel Plugging Agent Gel Strength Temperature and Salt Resistance Plugging Performance

Determination of Working Pressure for Airport Runway Rubber Mark Cleaning Vehicle Based on Numeric Simulation

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co.puter Modeling in Engineering & Sciences 2019年第9期120卷 799-813页

作者： Haojun Peng Zhongwei Wu Jinbing Xia Bolin Dong Yuntao Peng Linghe Wang Xingxing Ma Wei Shen School of Mechanical Engineering Hefei University of TechnologyHefeiChina Fire Detachment in Xi’an xianyang International Airport co. Ltd.XianyangChina Security Service co.Ltd. Xi’an Xianyang International AirportChina West Airport GroupXianyangChina

In this paper,numeric simulations are performed for three dimension models built acco.ding to actual surface cleaner in airport runway rubber mark cleaning vehicle using ANSYS FLUENT software on the basis of previous research finished by the *** analyzing the simulated flow fields under different standoff distances between nozzle outlet and runway surface and different discharge pressures at nozzle outlet,the relationships of normal stress and shear stress at striking point to outlet pressure and standoff distance are ***,the most appropriate discharge pressure at nozzle outlet for the studied surface cleaner model is found,and this will provide theoretical basis for future rubber mark cleaning process in airports and equipment model selection in subsequent design of airport runway rubber mark cleaning vehicles.

关键词： Runway cleaning surface cleaner numeric simulation nozzle pressure pump model selection

Water Repellent Finishing on co.ton Fabric via Atom Transfer Radical Polymerization

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Journal of Donghua University(English Edition) 2015年第1期32卷 7-12页

作者：李时伟邢铁玲李战雄陈国强 National Engineering Laboratory for Modern Silk College of Textile and Clothing EngineeringSoochow University xinyuan co.oon and Silk Group co. Ltd.

In order to enhance the water repellence property of co.ton fabric, co.ton fabric was grafted using hexafluorobutyl methacrylate( HFMT) monomer via atom transfer radical polymerization( ATRP) method. Water repellent co.ton fabric was successfully prepared, and characterized by scanning electron microsco.y( SEM),Fourier transform infrared spectrosco.y( FTIR), and X-ray photoelectron spectrosco.y( XPS). The SEM images of the HFMT-treated co.ton displayed significant difference from the untreated one. FT-IR characterization of the HFMTtreated co.ton indicated that HFMT was successfully grafted onto the surface of the co.ton fabric. XPS analysis indicated that the fluorine element of the HFMT-treated co.ton existing on the surface of the co.ton fabric. The surface co.tact angle test as well as the water repellence rating test showed that the water repellence of the HFMTtreated co.ton fabric was much better than that of the untreated co.ton fabric. The surface co.tact angle of the HFMT-treated co.ton fabric co.ld reach( 132. 4 ± 2. 2) °,and the water repellence rating co.ld achieve grade 3. The washing durability of the HFMT-treated fabric was also investigated. The surface co.tact angle of the HFMTtreated co.ton fabric co.ld reach( 121. 1 ± 2. 1) ° after 20 washing times. Furthermore, the whiteness, air permeability, breaking strength,and breaking elongation of the HFMT-treated co.ton fabric decreased slightly co.pared with the untreated co.ton ***,co.ton fabric with good water repellence property and excellent washing durability co.ld be obtained with little effect on the intrinsic properties of co.ton fabric.

关键词： co.ton fabric structure properties atom transfer radical polymerization(ATRP) hexafluorobutyl methacrylate(HFMT) water repellence

Transient Damping of Virtual Synchronous Generator for Enhancing Synchronization Stability during Voltage Dips

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CES Transactions on Electrical Machines and Systems 2024年第2期8卷 143-151页

作者： Shitao Sun Yu Lei Guowen Hao Yi Lu Jindong Liu Zhaoxin Song Jie Zhang North China Electric Power Research Institute co. Ltd.Beijing 100045China State Grid xinyuan co. Ltd.Beijing 100761China Hebei Fengning Pumped Storage Energy co.Ltd. Chengde 068350China

Virtual synchronous generators(VSGs)are widely introduced to the renewable power generation,the variablespeed pumped storage units,and so on,as a promising gridforming *** is noted that VSGs can provide virtual inertia for frequency support,but the larger inertia would worsen the synchronization stability,referring to keeping synchronization with the grid during voltage ***,this paper presents a transient damping method of VSGs for enhancing the synchronization stability during voltage *** is revealed that the loss of synchronization(LOS)of VSGs always acco.panies with the positive frequency deviation and the damping is the key factor to remove LOS when the equilibrium point *** order to enhance synchronization stability during voltage dips,the transient damping is proposed,which is generated by the frequency deviation in active power ***,the proposed method can realize seamless switching between normal state and grid ***,detailed co.trol design for transient damping gain is given to ensure the synchronization stability under different inertia requirements during voltage ***,the experimental results are presented to validate the analysis and the effectiveness of the improved transient damping method.

关键词： Virtual synchronous generator(VSG) Transient damping Synchronization stability Voltage dips

Differential metabolite analysis of the pharmaco.ynamic differences between different ratios of Dahuang(Radix Et Rhizoma Rhei Palmati)-Taoren(Semen Persicae) herb pair

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Journal of Traditional Chinese Medicine 2024年第3期44卷 515-523页

作者： WANG Xiang HUANG Jianping WANG Yupeng WANG Qilong JING Yajiang ZHANG Gang PENG Liang GAO Jing WANG Hongyan YAN Yonggang Department of Key Laboratory of"Qin Pharmaceutical"Research and Development Shaanxi University of Traditional Chinese MedicineXianyang 712046China Department of Yupeng Shaanxi Haitian Pharmaceutical co. Ltd.Xianyang 712046China Department of Acupuncture and Tuina Shaanxi University of Traditional Chinese MedicineXianyang 712000China

OBJECTIVE: To explore the material basis of the difference of efficacy of Dahuang(Radix Et Rhizoma Rhei Palmati)-Taoren(Semen Persicae)(DT) drugs with different proportions. METHODS: Samples of different ratios of Dahuang(Radix et Rhizoma Rhei Palnati, DH) to Taoren(Semen Persicae, TR)(Group A 1∶1, B 2∶3, C 3∶2) were analyzed based on gas chromatography time-of-flight mass spectrometry untargeted metabolomics technique. RESULTS: A total of 240 primary metabolites were detected. Forty-one differential metabolites involved nine differential metabolic pathways, of which four were closely related to the efficacy of DT in the treatment of heat and blood stasis syndrome. These pathways included the biosynthesis of amino acid(phenylalanine tyrosine and tryptophan), flavonoids, unsaturated fatty acids, and the glyco.ysis/glyco.enesis pathway. co.CLUSION: There are significant differences in the efficacy of different ratios of DT drugs, and their optimal ratio for the treatment of heat and blood stasis syndrome should be 1∶1.

关键词： metabolomics metabolic networks and pathways differential metabolites Dahuang(Radix Et Rhizoma Rhei Palmati) Taoren(Semen Persicae) kernel drug pairs

co.stitutive model of visco.lastic dynamic damage for the material of gas obturator in modular-charge howitzer

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Defence Technology（防务技术） 2024年第9期39卷 203-216页

作者： Zhonggang Li Longmiao Chen Yifan Li Yufeng Jia Quan Zhang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Technology Center Shanxi North Machine-building Co.Ltd.Taiyuan 030009China Research and Development Department Kelong New Material Technology Co.Ltd.Xianyang 712000China

In order to investigate the mechanical response behavior of the gas obturator of the breech mechanism,made of polychloroprene rubber(PCR), uniaxial co.pression experiments were carried out by using a universal testing machine and a split Hopkinson pressure bar(SHPB), obtaining stress-strain responses at different temperatures and strain rates. The results revealed that, in co.parison to other polymers, the gas obturator material exhibited inco.spicuous strain softening and hardening effects;meanwhile, the mechanical response was more affected by the strain rate than by temperature. Subsequently, a succinct visco.lastic damage co.stitutive model was developed based on the ZWT model, including ten undetermined parameters, formulated with inco.porating three parallel co.ponents to capture the visco.lastic response at high strain rate and further enhanced by integrating a three-parameter Weibull function to describe the damage. co.pared to the ZWT model, the modified model co.ld effectively describe the mechanical response behavior of the gas obturator material at high strain rates. This research laid a theoretical foundation for further investigation into the influence of chamber sealing issues on artillery firing.

关键词： Breech mechanism Gas obturator Polychloroprene rubber co.stitutive model Strain rate Damage

co.position design and performance evaluation of rubber-particle cement-stabilized gravel

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Frontiers of Structural and Civil Engineering 2024年第9期18卷 1466-1477页

作者： Chaohui WANG Ke YI Feng CHEN Luqing LIU Xiaolei ZHOU Zhiwei GAO School of Highway Chang’an UniversityXi’an 710064China Shaanxi Transportation Technology co.sulting co. Ltd.Xi’an 710068China School of Information Engineering Xizang Minzu UniversityXianyang 71208China

To improve the mechanical properties and durability of the cement-stabilized base,rubber particles of three different sizes and with three different co.tents were optimally selected,the evolution laws of the mechanical strength and toughness of rubber-particle cement-stabilized gravel(RCSG)under different schemes were determined,and the optimal particle size and co.tent of rubber particles were *** this basis,the durability of the RCSG base was *** results show that with an increase in the rubber particle size and co.tent,the mechanical strength of RCSG gradually decreased,whereas the toughness and transverse deformation ability gradually increased.1%co.tent and 2–4 mm sized RCSG can better balance the relationship between mechanical strength and *** 7 d unco.fined co.pressive strength was 17.7%higher than that of the 4–8 mm *** 28 d toughness index and ultimate splitting strain can be increased by 9.8%and 6.3 times,respectively,co.pared with ordinary cement-stabilized gravel(CSG).In terms of durability,co.pared with CSG,RCSG showed a 3.7%increase in the water stability property of cement-stabilized base with 1%co.tent and 2–4 mm rubber particles,5.5%increase in the frozen co.fficient,and 80.6%and 37.9%increase in the fatigue life at 0.70 and 0.85 stress ratio levels,respectively.

关键词： pavement materials cement-stabilized gravel rubber particles material co.ponents mechanical property durability performance

Polyvinyl alco.ol fiber cement-stabilized macadam:A review and performance evaluation

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第3期11卷 406-423页

作者： Chaohui Wang Jikang Liu Shaochang Chen Feng Chen Zhiwei Gao School of Highway Chang'an UniversityXi'an 710064China Shaanxi Transportation Technology co.sulting co. Ltd.Xi'an 710068China School of Information Engineering Xizang Minzu UniversityXianyang 712082China

This review evaluated research results on polyvinyl alco.ol fiber cement-stabilized macadam(PVA-FCSM)to further improve the long-term durability of road structures and promote its in-depth study and high-quality *** suitable PVA fiber technical indexes for ordinary cement-stabilized macadam(CSM)were *** difference in the mechanical properties between CSM and PVA-FCSM was *** extent to which PVA fibers enhance the durability of CSM were ***,the mechanism of enhancement of CSM by PVA fibers was ***,the performance of each type of fiber cement-stabilized macadam(FCSM)was co.pared and *** results indicated that the suggested PVA fiber length and co.tent for CSM were 12-30 mm and 0.6-1.2 kg/m^(3),*** different ages,the mean degree of improvement in the unco.fined co.pressive strength was 14%,20%,and 14%,that in the co.pressive resilience modulus was 8%,11%,and 6%,and that in the splitting strength was 29%,15%,and 22%,*** different ages,the mean degree of decreased in the dry shrinkage co.fficient was 21%,16%,and 15%and that in the temperature shrinkage co.fficient(20℃-30℃)was 23%,23%,and 18%,*** co.fficients increased with extended curing ***,at the same stress level,PVA-FCSM has a higher fatigue life co.pared to *** bridging effect,high strength,and high modulus of PVA fiber enhance the strength and anti-cracking of *** reco.mended fiber type for CSM is PVA fiber.

关键词： Highway and railway engineering PVA fiber cement-stabilized macadam Mechanical performance Durability Enhancement mechanism Performance valuation

A 2D co.alt(Ⅱ) co.rdination Polymer [co.iqnc)_2]_n: Synthesis, Crystal Structure and Characterization

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Chinese Journal of Structural Chemistry 2015年第10期34卷 1612-1616页

作者：范广郭金婵李小博马占营邓玲娟张引莉 co.lege of Chemistry & Chemical Engineering Xianyang Normal University

A new co.alt（Ⅱ） co.rdination polymer with the formula of [co.iqnc）2]n（1, iqnc = l-isoquinolinecarboxylate） has been synthesized through hydrothermal synthesis and structurally characterized by single-crystal X-ray diffraction method. The title co.rdination polymer represents a two-dimensional layer structure featuring adjacent one-dimensional [co.iqnc）2]n chains co.nected with each other by unco.rdinated oxygen atoms of carboxylate. Crystal data： monoclinic, space group P21/c, a = 15.4302（2）, b = 5.6743（7）, c = 9.2307（1） A, β = 98.459（2）o, V = 799.41（2） A3, Z = 2, S = 1.019, the final R = 0.0346, w R = 0.0876（I 2σ（I）） and R = 0.0477 and wR = 0.1159 for all reflections. In addition, elemental analysis, IR, and magnetism properties are presented.

关键词： co.rdination polymer crystal structure hydrothermal synthesis single-crystal X-ray diffraction magnetism properties