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Characteristics of the active-layer under the China-Russia Crude Oil pipeline

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Journal of Mountain Science 2021年第2期18卷 323-337页

作者： SERBAN Mihaela LI Guo-yu SERBAN Raul-David WANG Fei FEDOROV Alexander VERA Samsonova CAO Ya-peng chen peng-chao WANG Wei State Key Laboratory of Frozen Soils Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Da Xing’anling Observation and Research Station of Frozen-Ground Engineering and Environment Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesJiagedaqi 165000China University of Chinese Academy of Sciences Beijing 100049China Melnikov Permafrost Institute SB RASYakutsk 677010Russia PetroChina Pipeline Company Langfang 065000China Jiagedaqi Oil and Gas Transmission Sub-company PetroChina Pipeline CompanyJiagedaqi 165000China

Active layer is a key component for permafrost environment studies as many subsurface biological,biogeochemical,ecological,and pedogenic activities prevail in this *** study focuses on active layer temperature monitoring in an area with sporadic permafrost at two adjacent sites along China-Russia Crude Oil Pipeline(CRCOP),NorthEast *** T1 is located in disturbed ground on the right-of-way(on-ROW)2 m away from the center of the oil pipeline.T2 is located in a natural and undisturbed site,around 16.6 m *** objective was to study seasonal variability of the active layer depth and thermal regime from October 2017 to September *** monitoring sites consist of soil temperature probes arranged in a vertical array at different depths at both *** following parameters were computed:number of isothermal days(ID),freezing days(FD),thawing days(TD),freezing degree days(FDD),thawing degree days(TDD),number of freeze-thaw days(FTD).The mean air temperature in the monitoring period reached-3.2℃.The temperature profile indicates that the maximum active layer thickness observed during the study period was 10 m at T1 and 2 m at *** majority of the soil temperatures were above or close to 0℃,resulting in great values of TDD,especially in the first 4 m *** for T1 were predominant and ranged between 600-1160℃·days(0-4 m depth)reflecting the influence of oil temperature from the *** T2 borehole FDD were predominant for all the soil layer depths resulting in less permafrost *** comparison emphasizes the significant influence of vegetation removal and the dispersed heat from the pipeline on the active layer thickness.

关键词： Soil thermal regime Permafrost China Russia Crude Oil Pipeline Active layer

Highly electrically conductive graphene papers via catalytic graphitization

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Nano Research 2022年第6期15卷 4902-4908页

作者： Huanqin peng Xin Ming Kai Pang Yanru chen Ji Zhou Zhen Xu Yingjun Liu Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang University38 Zheda RoadHangzhou 310027China Beijing Institute of Space Mechanics&Electricity Haidian DistrictBeijing Friendship Road 104Beijing 100094China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

The highly electrically conductive graphene papers prepared from graphene oxide have shown promising perspectives in flexible electronics,electromagnetic interference(EMI)shielding,and *** achieve high electrical conductivity,the graphene oxide precursor usually needs to be graphitized at extremely high temperature(~2,800°C),which severely increases the energy consumption and production ***,we report an efficient catalytic graphitization approach to fabricate highly conductive graphene papers at lower annealing *** graphene papers with boron catalyst annealed at 2,000°C show a high conductivity of~3,400 S·cm^(-1),about 47%higher than pure graphene *** catalyst facilitates the recovery of structural defects and improves the degree of graphitization by 80%.We further study the catalytic effect of boron on the graphitization behavior of graphene *** results show that the activation energy of the catalytic graphitization process is as low as 80.1 kJ·mol^(–1)in the temperature ranges *** effective strategy of catalytic graphitization should also be helpful in the fabrication of other kinds of highly conductive graphene macroscopic materials.

关键词： graphene papers catalytic graphitization boron catalyst catalytic kinetics

Hierarchical engineering of CoNi@Air@C/SiO_(2)@Polypyrrole multicomponent nanocubes to improve the dielectric loss capability and magnetic-dielectric synergy

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Journal of Materials Science & Technology 2023年第16期147卷 37-46页

作者： Qiqin Liang Lei Wang Xiaosi Qi Qiong peng Xiu Gong Yanli chen Ren Xie Wei Zhong College of Physics Guizhou Province Key Laboratory for Photoelectrics Technology and ApplicationGuizhou UniversityGuiyang 550025China National Demonstration Center for Experimental Materials Science and Engineering Education Jiangsu University of Science and Technology Zhenjiang 212003China National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology Nanjing UniversityNanjing 210093China

Impedance matching characteristics and loss capabilities including magnetic loss,polarization loss and conduction loss are critical factors to improve microwave absorption performances(MAPs).To elevate these aspects,herein,yolk-shell structured CoNi@Air@C/SiO_(2)@Polypyrrole(PPy)magnetic multicomponent nanocubes(MCNCs)were designed and successfully fabricated in high efficiency through a continuous co-precipitation route,classical Stöber method,thermal treatment and polymerization *** obtained results indicated that the formation of SiO_(2) effectively stabilized the cubic geometrical morphology and yolk-shell structure during the high-temperature pyrolysis *** introduction of PPy greatly boosted their polarization loss and conductive loss ***,the as-prepared yolkshell structured CoNi@Air@C/SiO_(2)@PPy MCNCs presented superior MAPs compared to CoNi@Air@C/SiO_(2) ***,by regulating the content of PPy,the obtained CoNi@Air@C/SiO_(2)@PPy MCNCs displayed tunable and excellent comprehensive MAPs in terms of strong absorption capabilities,broad frequency bandwidths and thin matching thicknesses,which could be ascribed to the unique structure and excellent magnetic-dielectric synergistic ***,our findings provided an alternative pathway to effectively utilize the magnetic-dielectric synergy and loss capabilities for the developing yolk-shell structured magnetic MCNCs as the strong wideband microwave absorbers.

关键词： Yolk-shell structure CoNi@Air@C/SiO_(2)@PPy Polarization and conductive loss Magnetic-dielectric synergy Microwave absorption

Effect of brain-derived neurotrophic factor on c-jun expression in the rd mouse retina

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International Journal of Ophthalmology(English edition) 2012年第3期5卷 266-271页

作者： Rui chen Xiao-Bei Yin Chun-Xia peng and Gen-Lin Li Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing Key Laboratory of Ophthalmology and Visual Sciences Beijing 100730 China

AIM: To determine the location of c-jun protein, dynamic changes in c-jun mRNA and protein expression, and ultrastructure characteristics in the rd mouse retina, following a single dose of brain-derived neurotrophic factor (BDNF) in a short period of time. METHODS: A single intravitreal injection of BDNF at two dosages (25 mu g/L or 50 mu g/L) was given to the right eye of the rd mouse at age 2 and 3 weeks respectively. Two weeks after injection, the location of c-jun protein in the retina was observed by immunofluorescence detection, c-jun mRNA and protein expression in retinas were detected by quantitative real time polymerase chain reaction (RT-PCR) and western immunoblotting analysis, ultrastructure characteristics of retinas were detected by transmission electron microscope (TEM) observation. RESULTS: c-jun protein was expressed in the inner nuclear layer (INL) of retina. BDNF at two dosages (25 mu g/L and 50 mu g/L) increased c-jun mRNA expression at PN-4 weeks respectively (P-1 =0.019, P-2=0.021). 50 mu g/L BDNF increased c-jun protein expression at PN-4 weeks (P =0.000). The retinal ultrastructure was improved. CONCLUSION: The effects of BDNF exerts on the c-jun expression in the retina are dose-dependent and time-dependent, which may mediate photoreceptor rescue indirectly in the pathological process of retinitis pigmentosa (RP)at early stage.

关键词： BDNF c-jun retina photoreceptor

Monitoring and Prediction of the Vibration Intensity of Seismic Waves Induced in Underwater Rock by Underwater Drilling and Blasting

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Defence Technology（防务技术） 2022年第1期18卷 109-118页

作者： Zhen-xiong Wang Wen-bin Gu Ting Liang Shou-tian Zhao peng chen Liu-fang Yu Research Institute of Chemical Defence 102205 China Armry Engineering University 210007China Archives Department of Space System100094China

All underwater drilling and blasting operations generate seismic ***,due to a lack of suitable vibration sensing instruments,most studies on the propagation of seismic waves have been limited to shorelines near construction areas or wharfs,whereas comparatively few studies have beerconducted on the larger seafloor *** address this gap,a seafloor vibration sensor system was developed and applied in this study that consists of an autonomous acquisition storage terminal,soft-ware platform,and hole-plugging device that was designed to record the blasting vibration intensities received through submarine rocks at a given measurement ***,dimensional analyses were used to derive a predictive equation for the strength of blast vibrations that considered the in fluence of the water *** combining reliable vibration data obtained using the sensor system in submarine rock and the developed predictive equation,it was determined that the water depth was ar important factor influencing the measured vibration *** results using the newly derivedequation were compared to those determined using the Sadowski equation,which is commonly used on land,and it was found that predictions using the derived equation were closer to the experimental values with an average error of less than 10%,representing a significant *** on these results the developed sensor system and preliminary theoretical basis was deemed suitable for studying the propagation behavior of submarine seismic waves generated by underwater drilling and blasting operations.

关键词： Seismic wave Underwater drilling and blasting Blasting vibration Dimensional analysis Induced seismicity

Optimization of mechanical properties and corrosion resistance of Zn-0.4Mn-0.8Li alloy using the hot rolling process

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Journal of Materials Science & Technology 2023年第14期145卷 136-147页

作者： Xinxin Yang peng Du Kun Li Weizong Bao Tao Xiang Jie chen Xingjun Liu Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Zinc-based degradable metals are considered one of the most promising biodegradable materials due to their moderate corrosion rate,excellent mechanical properties,and good *** this work,biodegradable Zn-0.4Mn-0.8Li alloy was fabricated and rolled in multiple passes at different tem *** the hot rolling temperature increases,the grain size of Zn-0.4Mn-0.8Li alloy was found to increase ***,a multi-scale structure with the coexistence of coarse grains and fine grains was *** results demonstrated that the mechanical strength and corrosion resistance were improved by increasing the rolled *** was observed that Zn-0.4Mn-0.8Li alloy with a total reduction of 90%after hot rolling at 325℃ exhibited excellent mechanical and corrosion *** cooperation of multi-scale microstructure and twinning was found to improve the strength and guarantee the duc-tility of Zn-0.4Mn-0.8Li alloy significantly so that the 325℃ hot-rolled Zn-0.4Mn-0.8Li alloy has optimal comprehensive ***,yield strength,ultimate tensile strength,and elongation were found to be 449.7±5.3 MPa,505.1±6.5 MPa,and 40.5%±7.5%,***,Zn-0.4Mn-0.8Li al-loy via 325℃ hot-rolled processes also exhibited excellent corrosion *** corrosion current density and corrosion potential were found to be 8.8×10-5 mA cm^(-2)and−0.929 V,*** preliminary study indicates that Zn-0.4Mn-0.8Li alloy is a promising candidate material for medical de-vice applications.

关键词： Zn-based degradable metal Hot rolling Mechanical property Corrosion behavior

Time-sequenced damage behavior of reactive projectile impacting double-layer plates

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Defence Technology(防务技术) 2023年第9期27卷 263-272页

作者： Ying Yuan Yi-qiang Cai Huan-guo Guo peng-wan chen Rui Liu Hai-fu Wang Beijing Institute of Technology Beijing100081China

The time-sequenced damage behavior of the reactive projectile impacting double-layer plates is *** analytical model considering the combined effect of kinetic and chemical energy is developed to reveal the damage *** influences of impact velocity and reactive projectile chemical characteristics on the damage effect are decoupled analyzed based on this *** analyses indicate that the high energy releasing efficiency and fast reaction propagation velocity of the reactive projectile are conducive to enhancing the damage *** experiments with various reactive projectiles impact velocity increasing from 702 to 1385 m/s were conducted to verify this *** experimental results presented that,the damage hole radius of the rear-plate increases with the increase of impact *** the impact velocity of 1350 m/s,the radius of damage hole formed by PTFE/Al/Bi_(2)O_(3),PTFE/Al/MoO_(3),PTFE/Al/Fe_(2)O_(3)projectile on the rear-plate become smaller in *** results are consistent with the analytical model prediction,demonstrating that this model can predict the damage effect *** work is of constructive significance to the application of reactive projectiles.

关键词： Reactive projectile Damage behaviors Impact Double-layer plates

Self-oriented central-tumor delivery of legumain-cleavable vehicles governed by circulating monocyte/macrophage for precise tumor enrichment and immune activation

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Nano Research 2023年第4期16卷 5189-5205页

作者： Fangying Yu Xuwei Shang Yun Zhu Lijun peng Simin chen Tingting Meng Hong Yuan Fuqiang Hu College of Pharmaceutical Science Zhejiang UniversityHangzhou 310058China Department of Pharmacy Nanjing Drum Tower Hospitalthe Affiliated Hospital of Nanjing University Medical SchoolNanjing 210008China

Compressed blood and intratumoral lymphatic vessels induced by proliferated tumor cells and elevated interstitial fluid pressure produce regional hypoxic and necrotic region within tumors,which severely reduced the accessibility of immunogenic cell death(ICD)related drugs and immune-related ***,the strategy of self-oriented deep tumor delivery by circulating monocyte/macrophage was ***,CS-AI including an indoleamine 2,3-dioxygenase(IDO)inhibitor indoximod(IND)and hydrophilic chitosan(CSO)linked with alanine-alanine-asparagine(AAN)was prepared,which could be selectively cleaved by legumain overexpressed in macrophages and promote the collapse in ***,CS-AI was modified with mannose on the surface and further encapsulated the ICD inducer doxorubicin(DOX)to obtain M-CS-AI/*** intravenous injection,MCS-AI/DOX was specially recognized and internalized by circulating monocyte in *** formed drugs/monocyte tend to distribute in hypoxia/necrosis region guided by the homing signals released by *** monocytes then further differentiated into macrophages,up-regulating the expression of legumain and promoting the sensitive-release of chemo-drug DOX,IND,and the mannose-modified CSO(M-CSO).The released IND would specifically regulate immunosuppressive tumor microenvironment,and synergistically inhibit tumor growth with immune activation elements,ICD-induced DOX,and the favorable adjuvant *** summary,the self-oriented deep tumor delivery of legumain-cleavable nanovesicles through circulating monocyte makes it possible for reaching tumor regions inaccessible for nanoparticles and provides a novel insight for precise tumor enrichment and immune activation.

关键词： self-oriented circulating monocyte/macrophage hitchhike legumain-sensitive vehicles precise central-tumor enrichment immune activation

Efficacy and safety of low-dose thalidomide combined with mesalazine in the treatment of refractory ulcerative colitis in adults

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Gastroenterology Report 2022年第1期10卷 653-655页

作者： Jun-Rong chen Lei Mai Jia-chen Sun Xiang peng Min Zhang Min Zhi Department of General Practice The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China Department of Gastroenterology The Fifth Affiliated HospitalSun Yat-sen UniversityZhuhaiGuangdongP.R.China Department of Gastrointestinal Endoscopy The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China Department of Gastroenterology The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China

Introduction Inducing and maintaining clinical remission and mucosal healing is essential in the treatment of ulcerative colitis(UC),a nonspecific chronic recurrent inflammatory disorder[1].Mesalazine(5-ASA)is commonly prescribed as a first-line drug for *** the short-term efficacy of ciclosporin and infliximab,some patients may develop methylprednisolone resistance or dependence[2].

关键词： healing clinical treatment