检索结果-南通市图书馆

Carbon isotope fractionation during shale gas transport: Mechanism, characterization and significance

Science China Earth Sciences 2020年第5期63卷 674-689页

作者： Wenbiao LI Shuangfang LU Junqian LI Pengfei ZHANG siyuan wang Wenjun FENG Yongbo WEI School of Geosciences China University of Petroleum(East China)Qingdao 266580China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

The gas in-place(GIP)content and the ratio of adsorbed/free gas are two key parameters for the assessment of shale gas resources and have thus received extensive attention.A variety of methods have been proposed to solve these issues,however none have gained widespread *** isotope fractionation during the methane transport process provides abundant information,serving as an effective method for differentiating the gas transport processes of adsorbed gas and free gas and ultimately evaluating the two key *** this study,four stages of methane carbon isotope fractionation were documented during a laboratory experiment that simulated gas transport through *** four stages reflect different transport processes:the free gas seepage stage(Ⅰ),transition stage(Ⅱ),adsorbed gas desorption stage(Ⅲ)and concentration diffusion stage(Ⅳ).Combined with the results of decoupling experiments,the isotope fractionation characteristics donated by the single effect(seepage,adsorption-desorption and diffusion)were clearly *** further propose a technique integrating the Amoco curve fit(ACF)method and carbon isotope fractionation(CIF)to determine the dynamic change in adsorbed and free gas ratios during gas *** find that the gases produced in stage Ⅰ are primarily composed of free gas and that carbon isotope ratios of methane(δ13C1)are stable and equal to the ratios of source gas(13C 10).In stage Ⅱ,the contribution of free gas decreases,while the proportion of adsorbed gas increases,and the δ13C1 gradually becomes *** the depletion of free gas,the adsorbed gas contribution in stage Ⅲ reaches 100%,and the δ13C1 becomes ***,in stage Ⅳ,the desorbed gas remaining in the pore spaces diffuses out under the concentration difference,and the δ13C1 becomes lighter again and finally *** addition,a kinetic model for the quantitative description of isotope fractionation during desorption and diffusion was established.

关键词： Shale gas Carbon isotope fractionation Seepage Adsorption-desorption Diffusion Gas in-place content Adsorbed/Free gas ratio

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The occurrence mechanism,assessment,and non-pharmacological treatment of dyspnea

引用

Medical Review 2024年第5期4卷 395-412页

作者： Beiyao Gao siyuan wang Shan Jiang Department of Rehabilitation Medicine China-Japan Friendship HospitalBeijing100029China

Dyspnea is a subjective sensation often described as a feeling of respiratory effort,tightness,or air *** underlying mechanisms of this symptom are multifaceted and involve factors such as respiratory centers,cardiovas-cular system,airways,neuromuscular components,and metabolic factors,although not fully *** classical theory of imbalance between inspiratory neural drive(IND)and the simultaneous dynamic responses of the respiratory system posits that the disruption of a normal and harmo-nious relationship fundamentally shapes the expression of respiratory *** and comprehensive treatment of dyspnea are crucial for patient rehabilitation,including subjective self-reporting and objective clinical ***-pharmacological interventions,such as pulmonary rehabilitation,fan therapy,exercise,chest wall vibration,virtual reality technology,traditional Chinese medicine(acupuncture and acupressure),and yoga,have shown promise in alleviating dyspnea ***-ally,oxygen therapy,has demonstrated short-term beneﬁts for patients with pre-hospital respiratory distress and *** review provides a comprehensive overview of dyspnea,emphasizing the importance of a multifaceted approach for its assessment and management,with a focus on non-pharmacological interventions that contribute to enhanced patient outcomes and quality of life.

关键词： dyspnea assessment interventions

来源：

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

A portable viable Salmonella detection device based on microfluidic chip and recombinase aided amplification

引用

Chinese Chemical Letters 2023年第2期34卷 268-273页

作者： Wuzhen Qi siyuan wang Lei wang Xinge Xi Shangyi Wu Yanbin Li Ming Liao Jianhan Lin Key Laboratory of Agricultural Information Acquisition Technology Ministry of Agriculture and Rural AffairsChina Agricultural UniversityBeijing 100083China Department of Biological and Agricultural Engineering University of ArkansasFayetteville 72701United States College of Veterinary medicine South China Agricultural UniversityGuangzhou 510642China

creening of foodborne pathogens is important to prevent contaminated foods from their supply chains.n this study, a portable detection device was developed for rapid, sensitive and simple detection of viable almonella using a finger-actuated microfluidic chip and an improved recombinase aided amplification (RAA) assay. Improved propidium monoazide(PMAxx) was combined with RAA to enable this device to distinguish viable bacteria from dead ones. The modification of PMAxx into dead bacteria, the magnetic xtraction of nucleic acids from viable bacteria and the RAA detection of extracted nucleic acids were performed using the microfluidic chip on its supporting device by finger press-release operations. The fluorescent signal resulting from RAA amplification of the nucleic acids was collected using a USB camera nd analyzed using a self-developed smartphone App to quantitatively determine the bacterial concenration. This device could detect Salmonella typhimurium in spiked chicken meats from 1.3 × 10^(2) CFU/m L o 1.3 × 10^(7) CFU/m L in 2 h with a lower detection limit of 130 CFU/m L, and has shown its potential for on-site detection of foodborne pathogens.

关键词： Finger-actuated microfluidic chip PMAxx Recombinase aid amplification Smartphone App Viable bacterial detection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The role of dendritic cells in the immunomodulation to implanted biomaterials

引用

International Journal of Oral Science 2022年第4期14卷 424-438页

作者： siyuan wang Yanqi Chen Zhaoting Ling Jia Li Jun Hu Fuming He Qianming Chen Stomatology Hospital School of StomatologyZhejiang University School of MedicineClinical Research Center for Oral Disease of Zhejiang ProvinceKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceCancer Centerof Zhejiang UniversityHangzhouChina

Considering the substantial role played by dendritic cells(DCs) in the immune system to bridge innate and adaptive immunity,studies on DC-mediated immunity toward biomaterials principally center on their adjuvant effects in facilitating the adaptive immunity of codelivered antigens. However, the effect of the intrinsic properties of biomaterials on dendritic cells has not been clarified. Recently, researchers have begun to investigate and found that biomaterials that are nonadjuvant could also regulate the immune function of DCs and thus affect subsequent tissue regeneration. In the case of proteins adsorbed onto biomaterial surfaces,their intrinsic properties can direct their orientation and conformation, forming “biomaterial-associated molecular patterns(BAMPs)”. Thus, in this review, we focused on the intrinsic physiochemical properties of biomaterials in the absence of antigens that affect DC immune function and summarized the underlying signaling pathways. Moreover, we preliminarily clarified the specific composition of BAMPs and the interplay between some key molecules and DCs, such as heat shock proteins(HSPs) and high mobility group box 1(HMGB1). This review provides a new direction for future biomaterial design, through which modulation of host immune responses is applicable to tissue engineering and immunotherapy.

关键词： immunity biomaterials clarified

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A lab-on-a-disc platform based on nickel nanowire net and smartphone imaging for rapid and automatic detection of foodborne bacteria

引用

Chinese Chemical Letters 2022年第4期33卷 2091-2095页

作者： Xiaoting Huo Lei wang Wuzhen Qi Na Rong Yingjia Liu siyuan wang Hong Duan Jianhan Lin Key Laboratory of Agricultural Information Acquisition Technology Ministry of Agriculture and Rural AffairsChina Agricultural UniversityBeijing 100083China Key Laboratory of Modern Precision Agriculture System Integration Research Ministry of EducationChina Agricultural UniversityBeijing 100083China

Foodborne pathogenic bacteria have been considered as a major risk factor for food safety. It is of great significance to carry out in-field screening of pathogenic bacteria to prevent the outbreaks of foodborne diseases. In this study, a portable lab-on-a-disc platform with a microfluidic disc was developed for rapid and automatic detection of Salmonella typhimurium using a nickel nanowire(Ni NW) net for effective separation of target bacteria, horseradish peroxidase nanoflowers(HRP NFs) for efficient amplification of biological signals, and a self-developed smartphone APP for accurate analysis of colorimetric images. First,the microfluidic disc was preloaded with reagents and samples and centrifuged to form one bacterial sample column, one immune Ni NW column, one HRP NF column, two washing buffer columns and one tetramethylbenzidine(TMB) column, which were separated by air gaps. Then, a rotatable magnetic field was specifically developed to assemble the Ni NWs into a net, which was automatically controlled by a stepped motor to successively pass through the sample column for specific capture of target bacteria, the HRP NF column for specific label of target bacteria, the washing columns for effective removal of sample background and non-specific binding NFs, and the TMB column for colorimetric determination of target bacteria. The color change of TMB from colorless to blue was finally analyzed using the smartphone APP to quantitatively determine the target bacteria. This lab-on-a-disc platform could detect Salmonella typhimurium from 5.6 × 10^(1) CFU/20 μL to 5.6 × 10^(5) CFU/20 μL in 1 h with a lower detection limit of 56 CFU/20 μL. The recovery of target bacteria in spiked chicken samples ranged from 97.5% to 101.8%. This portable platform integrating separation, labeling, washing, catalysis and detection onto a single disc is featured with automatic operation, fast reaction, and small size and has shown its potential for in-field detection of foodborne pathoge

关键词： Lab-on-a-disk platform Nickel nanowire net Horseradish peroxidase nanoflowers Smartphone Bacteria detection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Triboelectric-Based Artificial Whisker for Reactive Obstacle Avoidance and Local Mapping

引用

Research 2021年第1期2021卷 1485-1494页

作者： Peng Xu Xinyu wang siyuan wang Tianyu Chen Jianhua Liu Jiaxi Zheng Wenxiang Li Minyi Xu Jin Tao Guangming Xie Marine Engineering College Dalian Maritime UniversityDalian 116026China College of Artificial Intelligence Nankai UniversityTianjin 300350China Department of Electrical Engineering and Automation Aalto UniversityEspoo 02150Finland Intelligent Biomimetic Design Lab College of EngineeringPeking UniversityBeijing 100871China Institute of Ocean Research Peking UniversityBeijing 100871China

Since designing efficient tactile sensors for autonomous robots is still a challenge,this paper proposes a perceptual system based on a bioinspired triboelectric whisker sensor(TWS)that is aimed at reactive obstacle avoidance and local mapping in unknown *** proposed TWS is based on a triboelectric nanogenerator(TENG)and mimics the structure of rat whisker *** operates to generate an output voltage via triboelectrification and electrostatic induction between the PTFE pellet and copper films(0.3 mm thickness),where a forced whisker shaft displaces a PTFE pellet(10 mm diameter).With the help of a biologically inspired structural design,the artificial whisker sensor can sense the contact position and approximate the external stimulation area,particularly in a dark *** highlight this sensor’s applicability and scalability,we demonstrate different functions,such as controlling LED lights,reactive obstacle avoidance,and local mapping of autonomous surface *** results show that the proposed TWS can be used as a tactile sensor for reactive obstacle avoidance and local mapping in robotics.

关键词： whisker obstacle autonomous

来源：

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

Deep-Learning-Assisted Underwater 3D Tactile Tensegrity

引用

Research 2023年第3期2023卷 683-695页

作者： Peng Xu Jiaxi Zheng Jianhua Liu Xiangyu Liu Xinyu wang siyuan wang Tangzhen Guan Xianping Fu Minyi Xu Guangming Xie Zhong Lin wang Dalian Key Laboratory of Marine Micro/Nano Energy and Self-powered Systems Marine Engineering CollegeDalian Maritime UniversityDalian 116026China School of Information Science and Technology Dalian Maritime UniversityDalian 116026China Intelligent Biomimetic Design Lab College of EngineeringPeking UniversityBeijing 100871China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100871China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332-0245USA

The growth of underwater robotic applications in ocean exploration and research has created an urgent need for effective tactile ***,we propose an underwater 3-dimensional tactile tensegrity(U3DTT)based on soft self-powered triboelectric nanogenerators and deep-learning-assisted data *** device can measure and distinguish the magnitude,location,and orientation of perturbations in real time from both flow field and interaction with obstacles and provide collision protection for underwater vehicles *** is enabled by the structure that mimics terrestrial animals’musculoskeletal systems composed of both stiff bones and stretchable ***,when successfully integrated with underwater vehicles,the U3DTT shows advantages of multiple degrees of freedom in its shape modes,an ultrahigh sensitivity,and fast response times with a low cost and *** real-time 3-dimensional pose of the U3DTT has been predicted with an average root-mean-square error of 0.76 in a water pool,indicating that this developed U3DTT is a promising technology in vehicles with tactile feedback.

关键词： underwater tile stiff

来源：

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

Extending MoS_(2)-based materials into the catalysis of non-acidic hydrogen evolution:challenges,progress,and perspectives

Materials Futures

引用

Materials Futures 2023年第2期2卷 54-78页

作者： Hao Fei Ruoqi Liu Yunze Zhang Hongsheng wang Miao wang siyuan wang Meng Ni Zhuangzhi Wu Jian wang School of Materials Science and Engineering Central South UniversityChangsha 410083People’s Republic of China School of Energy and Environment City University of Hong KongKowloonHong Kong SARPeople’s Republic of China Department of Building and Real Estate Research Institute for Sustainable Urban Development(RISUD)&Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityHong Kong SARPeople’s Republic of China

Water splitting is regarded as among the most prospective methods of generating green *** electrolytes of water electrolysis from acidic to non-acidic ones will enable the use of noble-metal-free electrocatalysts and mitigate material corrosion,thus lowering the capital cost of water electrolyzers and improving their operational ***,increasing electrolyte pH will degrade the hydrogen evolution reaction(HER)activity because of the reduced concentration of H_(3)O^(+)as reactants,making non-acidic HER *** accelerate HER,MoS_(2)-based materials with the advantages of unique atomistic structure,low cost,and high abundance have been considered prospective electrocatalysts to substitute for Pt in *** efforts are being spent on extending MoS_(2)-based materials into the catalysis of non-acidic HER,and their further development requires clarification of the existing challenges and current ***,it has not yet been discussed for non-acidic HER on MoS_(2)-based *** mitigate the disparity,we systematically overview MoS_(2)-based electrocatalysts for non-acidic HER,covering catalytic mechanisms,modulation strategies,materials development,current challenges,research progress,and *** review will contribute to the rational design of MoS_(2)-based materials for high-performance HER in non-acidic conditions.

关键词： MoS_(2) hydrogen evolution reaction non-acidic electrocatalyst

来源：

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

Scale-Dependent Nature of Porosity and Pore Size Distribution in Lacustrine Shales: An Investigation by BIB-SEM and X-Ray CT Methods

引用

Journal of Earth Science 2019年第4期30卷 823-833页

作者： Junqian Li Pengfei Zhang Shuangfang Lu Chen Chen Haitao Xue siyuan wang Wenbiao Li School of Geosciences China University of Petroleum (East China)

Due to heterogeneous pore distributions within shales,petrophysical properties of shales determined by scanning electron microscopy(SEM) and X-ray computed tomography(CT) methods strongly depend on the observed domain size(analysis scale). In this paper,the influence of the analysis scale on areal and bulk porosities and pore size distribution(PSD) for lacustrine shales from the Dongying sag of Bohai Bay Basin,China were investigated using broad ion beam(BIB)-SEM and X-ray CT *** BIB-SEM cross-sections with high imaging resolution(10 nm/pixel) and a large field of view(>1 mm2)mainly describe the 2 D nanoscale pore system in the two shales(samples F41#-2 and Y556#-1),while CTbased 3 D reconstructions with resolutions of 0.42(F41#-1) and 0.5 μm/pixel(H172#-1) reflect the 3 D submicron pore system. The results indicate that the areal(bulk) porosity exhibits a multiple power-law distribution with increasing analysis area(volume),which can be used to extrapolate the porosity of a given area(volume). Based on SEM and CT investigations,the sizes of the minimum representative elementary areas(REAs) and volumes(REVs) were determined respectively,which are closely associated with the heterogeneousness of the pore system. Minimum REAs are proposed to be 2.93×10~4(F41#-2) and 0.91×10~4μm2(Y556#-1),and minimum REVs are 0.016(F41#-1) and 0.027 mm^3(H172#-1). As the analyzed areas(volumes) are larger than the minimum REA(REV),obtained 2 D(3 D) PSDs are comparable to each other and can be considered to reflect the shale PSD. These results provide insights into the porosity and PSD characterization of shales by SEM and X-ray CT methods.

关键词： lacustrine shale porosity pore size distribution BIB-SEM X-ray CT

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Single Crystal Fibers:Diversified Functional Crystal Material

引用

Advanced Fiber Materials 2019年第3期1卷 163-187页

作者： Tao wang Jian Zhang Na Zhang siyuan wang Baiyi Wu Na Lin Peter Kusalik Zhitai Jia Xutang Tao State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100People’s Republic of China Key Laboratory of Functional Crystal Materials and Device Ministry of EducationJinan 250100China Department of Chemistry University of CalgaryCalgaryAB T2N 1N4Canada Key Laboratory of Functional Crystals and Laser Technology TIPCCASBeijing 100190China

Single crystal fibers(SCF)are considered to be a combination of bulk crystals and conventional fibers,thereby possessing the stable physical and chemical properties accompanied with excellent waveguide *** paper gives a detailed introduction to the development history of single crystal fibers,including the evolution of the growth technique and the optimization of the growth ***-heated pedestal growth(LHPG)and Micro-pulling-down(μ-PD)methods are considered to be the most widely used growth techniques for growing single crystal fibers,and the advantages of the two methods are also introduced in *** second part of this paper describes the characterization of single crystal fibers,including diameter fluctuation,crystal quality and optical losses.A series of cladding approaches for SCF,such as magnetron sputtering,sol-gel,liquid phase epitaxy,co-drawing LHPG,ion implantation and micro-structure cladding will be *** addition,the research status of single crystal fiber laser and single crystal fiber sensor are also summarized in view of the current research foundation.

关键词： Single crystal fibers LHPG μ-PD Characterization method Cladding approaches Single crystal fiber laser Single crystal fiber sensor

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：