检索结果-南通市图书馆

Environmental risks for application of magnesium slag to soils in China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第7期19卷 1671-1679页

作者： WANG Xiao-bin YAN xiang LI Xiu-ying Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081P.R.China

Magnesium slag(MS)is one of the main industrial solid wastes produced by the magnesium *** the problem of its disposal has attracted much attention with increasing amounts of solid wastes generated in the production of metallic *** MS contains calcium(Ca),magnesium(Mg),and silicon(si),some have tried to use MS as si-Ca-Mg fertilizer or for soil amendment in ***,in the magnesium metallurgical process,some pollutant elements are introduced into MS,resulting in the enrichment of these pollutants in MS,such as arsenic(As),chromium(Cr),cadmium(Cd),mercury(Hg),copper(Cu),nickel(Ni),fluorine(F)and chlorine(CI).Research indicates that the enrichment of these pollutants can result in high levels,especially for Cd,Hg,Cu,Ni,F and CI(0-4,0-0.74,20-127,100-170,2277-14800 and 133-1000 mg kg1,respectively)in some MS in *** levels are often far beyond the limits(S0.3,s0.5,≤50 and≤60 mg·kg-1 for Cd,Hg,Cu and Ni,respectively)of the Chinese Risk Screening Values for Soil Contamination of Agricultural Land based on the Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land(GB 15618-2018)or the critical reference values(<800 and≤200 for F and CI,respectively).The elements Hg,Cu,Cr and F(detected in MS leachate at 0.00023--0.0052,0.043--3.89,0.026-0.171,and 1.43-8.52 mg·L-1,respectively)also exceed the limits(Class IV-V)of the Chinese Standard for Groundwater Quality(GB/T 14848-2017).Based on the above results,it is suggested that without any pretreatment for reducing harmful pollutants MS should not be allowed to be applied for soil remediation or conditioning directly into farmlands in order to ensure soil health,food safety and environmental quality.

关键词： environmental safety risk heavy metals industrial solid wastes magnesium slag

Environmental risk for application of ammonia-soda white mud in soils in China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2020年第3期19卷 601-611页

作者： WANG Xiao-bin YAN xiang LI Xiu-ying Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences

In recent years,some reports,mainly from Chinese research,show that there has been an increasing trend in the use of ammonia-soda residue(ASR)(or called ammonia-soda white mud) as a soil conditioner in *** to now,the studies on ASR have focused on its utilization for acid soil amendment in agriculture,but few studies have assessed its environmental *** contains pollutant elements such as mercury(Hg),cadmium(Cd),copper(Cu) and fluorine(F) and the purpose of this study was to review research on the environmental impacts of ASR application in *** obtained from 23 research reports indicate that the concentrations of Hg,Cd,Cu,F and Cl(0-170,0.01-2.8,4.5-200,2000-24700 and 1 600-188 000 mg kg^-1,respectively) in ASR may exceed the limits(≤0.5,≤0.3 and ≤50 mg kg^-1 for Hg,Cd and Cu,respectively) of Chinese Risk Screening Values for Soil Contamination of Agricultural Land(GB 15618-2018 2018) or the refereed critical value(≤800 and ≤200 mg kg^-1 for F and Cl,respectively) based on Chinese *** concentrations of the elements Hg,Cd,Cu,F and Cl in the leachate of ASR detected by the extraction tests also exceed the limits(Class IV-V) of the Chinese Standard for Groundwater Quality(GB/T 14848-2017 2017).Based on the above results,it is suggested that ASR without any pretreatment for reducing harmful pollutants should not be used for soil remediation or conditioning of farmlands,to ensure soil health,food safety and environmental quality.

关键词： environmental safety risk heavy metals industrial solid wastes ammonia-soda white mud ammonia-soda residue

Effect of Peak Perforation on Flow Past A Conic Cylinder at Re=100:Drag,Lift and Strouhal Number

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2017年第3期31卷 330-340页

作者： LIN Li-ming ZHONG Xing-fu WU ying-xiang The Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China

A flow past a circular-section cylinder with a perforated conic shroud, in which the perforation is located at the peak of the conic disturbance as the shroud installed on the cylinder and uniformly distributed with several circular holes, is numerically simulated at a Reynolds number of 100. Two factors in the perforation are taken into account, i.e. the attack angle relative to the direction of incoming flow and diameter of holes. The effect of such perforation on the drag, lift and vortex-shedding frequency is mainly investigated. Results have shown that variation of the attack angle has a little effect, especially on the drag and vortex-shedding frequency, except in certain cases due to the varied vortex-shedding patterns in the near wake. The increasing hole diameter still exhibits a little effect on the drag and frequency of vortex shedding, but really reduces the lift, in particular at larger wavelength, such as the lift reduction reaching almost 66% 68% after introducing the perforation.

关键词： vortex-induced vibration perforation conic disturbance drag lift Strouhal number

*** Rate and L^(p)-Convergence of Bisexual Branching Processes in a Random Environment and Varying Environment

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae sinica 2023年第2期39卷 337-353页

作者： Sheng XIAO xiang-dong LIU ying-qiu LI School of economics Jinan UniversityGuangzhou510632China School of Mathematics and Statistics Changsha University of Science and TechnologyChangsha 410004China Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering Changsha University of Science and TechnologyChangsha 410004China

Let(Z_(n))be a supercritical bisexual branching process in a random environmentξ.We study the almost sure(a.s.)convergence rate of the submartingale W_(n)=Z_(n)/In to its limit W,where(In)is an usually used norming *** prove that under a moment condition of order p∈(1,2),W-W_(n)=o(e^(-na))*** some a>0 that we find explicitly;assuming the logarithmic moment condition holds,we haveW-W_(n)=o(n^(-α))a.s..In order to obtain these results,we provide the L^(p)-convergence of(W_(n));similar conclusions hold for a bisexual branching process in a varying environment.

关键词： bisexual branching process convergence rate varying environment random environment

Application prospects of urine-derived stem cells in neurological and musculoskeletal diseases

在线全文

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2024年第10期15卷 918-931页

作者： Hui-si Yang Yue-xiang Zheng Xue Bai Xiu-ying He Ting-Hua Wang Department of Neurology and National Traditional Chinese Medicine Clinical Research Base The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of Anesthesiology Institute of Neurological DiseaseWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Anesthesiology Institute of Neurological DiseaseTranslational Neuroscience CenterWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina

Urine-derived stem cells(USCs)are derived from urine and harbor the potential of proliferation and multidirectional ***,USCs could be reprogrammed into pluripotent stem cells[namely urine-derived induced pluripotent stem cells(UiPSCs)]through transcription factors,such as octamer binding transcription factor 4,sex determining region Y-box 2,kruppel-like factor 4,myelocytomatosis oncogene,and Nanog homeobox and protein lin-28,in which the first four are known as Yamanaka *** evidence supports that USCs and UiPSCs possess high potential of neurogenic,myogenic,and osteogenic differentiation,indicating that they may play a crucial role in the treatment of neurological and musculoskeletal ***,we summarized the origin and physiological characteristics of USCs and UiPSCs and their therapeutic application in neurological and musculoskeletal disorders in this review,which not only contributes to deepen our understanding of hallmarks of USCs and UiPSCs but also provides the theoretical basis for the treatment of neurological and musculoskeletal disorders with USCs and UiPSCs.

关键词： Urine-derived stem cells Urine-derived induced pluripotent stem cells Neurological diseases Musculoskeletal diseases Treatment prospect

Advances in endoscopic diagnosis and management of colorectal cancer

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

World Journal of Gastrointestinal Oncology 2024年第10期16卷 4045-4051页

作者： Shi-Wei Li xiang Liu si-Yu Sun Department of Gastroenterology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina Engineering Research Center of Ministry of Education for Minimally Invasive Gastrointestinal Endoscopic Techniques Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

Colorectal cancer(CRC)is a leading global health concern,and early identification and precise prognosis play a vital role in enhancing patient *** is a minimally invasive imaging technique that is crucial for the screening,diagnosis,and treatment of *** editorial discusses the importance of advances in endoscopic techniques,the integration of artificial intelligence,and the potential of novel technologies in enhancing the diagnosis and management of CRC.

关键词： Colorectal cancer Endoscopic diagnosis Endoscopic management Artificial intelligence Endoscopic devices

Ultra-lightweight Ti3C2Tx MXene modified separator for Li–S batteries:Thickness regulation enabled polysulfide inhibition and lithium ion transportation

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

Journal of Energy Chemistry 2020年第3期29卷 116-125页

作者： Nuo Li ying Xie Shuting Peng xiang Xiong Kai Han Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina State Key Laboratory for Powder Metallurgy Powder Metallurgy Research InstituteCentral South UniversityChangsha 410083HunanChina

The practical application of lithium–sulfur(Li–S)batteries is limited by the easy dissolution of polysulfides in the electrolyte,resulting in the lithium polysulfide(LPS)shuttle *** two-dimensional(2D)materials with abundant active binding sites and high surface-to-volume ratios have been developed to prepare functional separators that suppress the diffusion of ***,the influence of modified layer thickness on Li+transport has not been ***,we synthesized individual and multilayered 2D Ti3C2Tx MXene nanosheets and used them to fabricate a series of Ti3C2Tx-PP modified *** separators had mass loadings ranging from 0.16 to 0.016 mg cm-2,which is the lowest value reported for 2D materials to the best of our *** corresponding reductions in thickness ranged from 1.2μm to 100 *** shuttling was effectively suppressed,even at the lowest mass loading of 0.016 mg *** was due to the strong interaction between LPS intermediates and Ti atoms and hydroxyl functional groups on the separator *** lithium-ion diffusion coefficient increased with the reduction of Ti3C2Tx layers on the *** cycling stability and rate performance were attained when the separator with a Ti3C2Tx-PP mass loading of 0.016 mg cm-2 was incorporated into a Li–S *** nanotubes(CNTs)were introduced into the separators to further improve the electrical and Li+ionic conductivity in the cross-plane direction of the 2D *** the ultralightweight Ti3C2Tx/CNTs modified PP separator,the cell maintained a capacity of 640 m Ah g-1after 200cycles at 1C with a capacity decay of only 0.079%per cycle.

关键词： Lithium sulfur batteries Separator MXene Thicknesses 2D materials

Arbitrary topological charge vortex beams from carbon dots random lasers

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3844-3853页

作者： xiang-Dong Wang Xiao-Bo Mi Jiu-Ru He Feng-ying Ma Jun-Qiao Wang Li Song Yong-Qiang Zhang si-Yu Lu Yong-Sheng Hu School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Reliability and Intelligence of Electrical Equipment and Tianjin Key Laboratory of Electronic Materials and Devices School of Electronics and Information EngineeringHebei University of TechnologyTianjin 300401China Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou450001China

Vortex beams have attracted great attention due to their promising applications in the fields of high-capacity optical communication,optical micromanipulation,and quantum information ***,we demonstrate vortex beams with flexible control of the topological charge and modes in a carbon dots random laser for the first *** beams with different types,including the Laguerre-Gaussian(LG),Bessel-Gaussian(BG),LG-superposition,and polarized vortex beams with topological charges up to 50,have been successfully ***,vortex beams can be well realized in carbon dots random lasers with different emission wavelengths covering from 465 to 612 *** work would not only enrich the types of vortex laser,especially for solution-processable lasers,but also provide a new route to realizing multicolor and wavelength-tunable vortex lasers.

关键词： Carbon dots Random lasers Vortex beam Topological charge Spatial light modulator

Modeling and character analyzing of multiple fractional-order memcapacitors in parallel connection

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第1期31卷 642-651页

作者： xiang Xu Gangquan si Zhang Guo Babajide Oluwatosin Oresanya State Key Laboratory of Electrical Insulation and Power Equipment Shaanxi Key Laboratory of Smart GridSchool of Electrical EngineeringXi'an Jiaotong UniversityXi'an 710049China

Recently,the memory elements-based circuits have been addressed frequently in the nonlinear circuit theory due to their unique ***,the modeling and characterizing of the mem-elements become *** this paper,the analysis of the multiple fractional-order voltage-controlled memcapacitors model in parallel connection is ***,two fractional-order memcapacitors are connected in parallel,the equivalent model is derived,and the characteristic of the equivalent memcapacitor is analyzed in positive or negative *** a new understanding manner according to different rate factor K and fractional orderαis derived to explain the equivalent modeling structure ***,the negative order appears,which is a consequence of the combination of memcapacitors in different ***,the equivalent parallel memcapacitance has been drawn to determine that multiple fractional-order memcapacitors could be calculated as one composite ***,an arbitrary fractional-order equivalent memcapacitor could be constructed by multiple fractional-order memcapacitors.

关键词： memcapacitor fractional calculus parallel connection equivalent model