Due to the fine-grained communication scenarios characterization and stability,Wi-Fi channel state information(CSI)has been increasingly applied to indoor sensing tasks recently.Although spatial variations are explici...Due to the fine-grained communication scenarios characterization and stability,Wi-Fi channel state information(CSI)has been increasingly applied to indoor sensing tasks recently.Although spatial variations are explicitlyreflected in CSI measurements,the representation differences caused by small contextual changes are easilysubmerged in the fluctuations of multipath effects,especially in device-free Wi-Fi sensing.Most existing datasolutions cannot fully exploit the temporal,spatial,and frequency information carried by CSI,which results ininsufficient sensing resolution for indoor scenario changes.As a result,the well-liked machine learning(ML)-based CSI sensing models still struggling with stable performance.This paper formulates a time-frequency matrixon the premise of demonstrating that the CSI has low-rank potential and then proposes a distributed factorizationalgorithm to effectively separate the stable structured information and context fluctuations in the CSI matrix.Finally,a multidimensional tensor is generated by combining the time-frequency gradients of CSI,which containsrich and fine-grained real-time contextual information.Extensive evaluations and case studies highlight thesuperiority of the proposal.展开更多
A surfactant-polyalkane system is investigated using chemical reagents to dissolve methane and control coal seam gas from low-energy,high-efficiency,safety,and environmental protection perspectives.At different temper...A surfactant-polyalkane system is investigated using chemical reagents to dissolve methane and control coal seam gas from low-energy,high-efficiency,safety,and environmental protection perspectives.At different temperatures and pressures,a high-temperature and high-pressure reactor,gas chromatograph,and other related experimental equipment were used to perform methane dissolution experiments,and a single surfactant sodium oleate(NaOA)and n-hexane demonstrated superior results.The single-factor experiments of temperature,pressure,and NaOA addition were performed and fitted via a response surface analysis.The optimal conditions for methane solubility were as follows:temperature of 34C,pressure of 4.5 MPa,NaOA addition of 85 g/L,and time of 1 h.The optimal effect of the surfactant-polyalkane system in dissolving methane was achieved with 32.31 mL/100 mL.Meanwhile,the change in the surface structure of coal before and after washing with the system was compared using scanning electron microscopy.The results indicated that the gas after washing with the surfactant-polyalkane system dissolved,and the surface pore structure of the coal changed.Moreover,the specific surface area and pore size of the coal surface increased after washing.Hence,the desorption of gas from the coal surface into the system becomes easy,thereby reducing the gas content in the coal sample.展开更多
Rational design and exploitation of nanomaterials with superior treatment properties for suitable indications is a way out to relieve cost constraint of therapy and solve the unsatisfactory efficacy for cancer patient...Rational design and exploitation of nanomaterials with superior treatment properties for suitable indications is a way out to relieve cost constraint of therapy and solve the unsatisfactory efficacy for cancer patients.In this work,we propose a greatly facile approach to produce heterogeneous Pd-Au nanorods(Pd-Au NRs)that solve the current bottleneck problems of photothermal thermal therapy(PTT)as well as completely eliminate tumors in animal models without toxic side effects.Depositing Pd clusters on both tips of Au NRs offers Pd-Au NRs three novel functions,i.e.,the extension of the absorption into NIR-Ⅱ region,the activation of prodrug of 5-fluorouracil(5-Fu)via the bioorthogonal reaction,and the peroxidase-mimic activity to produce·OH.The heterogeneous nanorods showed a high and stable photothermal conversion efficiency(52.07%)in a safer NIR-Ⅱ irradiation region(1,064 nm),which not only eliminate most of tumor cells at only one dose of the irradiation for 5 min but also improve the in situ conversion of 5-fluoro-1-propargyluracil and H2O2 into active 5-Fu and·OH to eradicate residual tumors for inhibiting tumor metastasis.This dual catalytic activity-synergistic mechanism of PTT demonstrates the importance of material design in solving current bottleneck problem of tumor therapy.展开更多
基金the National Natural Science Foundation of China under Grant 61771258 and Grant U1804142the Key Science and Technology Project of Henan Province under Grants 202102210280,212102210159,222102210192,232102210051the Key Scientific Research Projects of Colleges and Universities in Henan Province under Grant 20B460008.
文摘Due to the fine-grained communication scenarios characterization and stability,Wi-Fi channel state information(CSI)has been increasingly applied to indoor sensing tasks recently.Although spatial variations are explicitlyreflected in CSI measurements,the representation differences caused by small contextual changes are easilysubmerged in the fluctuations of multipath effects,especially in device-free Wi-Fi sensing.Most existing datasolutions cannot fully exploit the temporal,spatial,and frequency information carried by CSI,which results ininsufficient sensing resolution for indoor scenario changes.As a result,the well-liked machine learning(ML)-based CSI sensing models still struggling with stable performance.This paper formulates a time-frequency matrixon the premise of demonstrating that the CSI has low-rank potential and then proposes a distributed factorizationalgorithm to effectively separate the stable structured information and context fluctuations in the CSI matrix.Finally,a multidimensional tensor is generated by combining the time-frequency gradients of CSI,which containsrich and fine-grained real-time contextual information.Extensive evaluations and case studies highlight thesuperiority of the proposal.
基金the financial support of project No.FRFIC-20-01 and No.FRF-IC-19-013the Fundamental Research Funds for the Central Universities,China project No.51974015,No.51904292,and No.51474017+5 种基金the National Natural Science Foundation of China,China project No.2018YFC0810600the National Key Research and Development Program of China,China project No.2017CXNL02the Fundamental Research Funds for the Central Universities(China University of Mining and Technology),China project No.BK20180655the Natural Science Foundation of Jiangsu Province,China project No.WS2018B03the State Key Laboratory Cultivation Base for Gas Geology and Gas Control(Henan Polytechnic University),China and project No.E21724the Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines of China(Hunan University of Science and Technology),China.
文摘A surfactant-polyalkane system is investigated using chemical reagents to dissolve methane and control coal seam gas from low-energy,high-efficiency,safety,and environmental protection perspectives.At different temperatures and pressures,a high-temperature and high-pressure reactor,gas chromatograph,and other related experimental equipment were used to perform methane dissolution experiments,and a single surfactant sodium oleate(NaOA)and n-hexane demonstrated superior results.The single-factor experiments of temperature,pressure,and NaOA addition were performed and fitted via a response surface analysis.The optimal conditions for methane solubility were as follows:temperature of 34C,pressure of 4.5 MPa,NaOA addition of 85 g/L,and time of 1 h.The optimal effect of the surfactant-polyalkane system in dissolving methane was achieved with 32.31 mL/100 mL.Meanwhile,the change in the surface structure of coal before and after washing with the system was compared using scanning electron microscopy.The results indicated that the gas after washing with the surfactant-polyalkane system dissolved,and the surface pore structure of the coal changed.Moreover,the specific surface area and pore size of the coal surface increased after washing.Hence,the desorption of gas from the coal surface into the system becomes easy,thereby reducing the gas content in the coal sample.
基金This work was supported by grants from the National Natural Science Foundation of China(Nos.31870946,81421004,52027801,31470916,and 51631001)the Natural Science Foundation of Beijing Municipality(No.2191001)+2 种基金the Funding of Double First-rate discipline construction(No.CPU2018GF07)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Open Project Program of MOE Key Laboratory of Drug Quality Control and Pharmacovigilance(No.DQCP20/21MS01).
文摘Rational design and exploitation of nanomaterials with superior treatment properties for suitable indications is a way out to relieve cost constraint of therapy and solve the unsatisfactory efficacy for cancer patients.In this work,we propose a greatly facile approach to produce heterogeneous Pd-Au nanorods(Pd-Au NRs)that solve the current bottleneck problems of photothermal thermal therapy(PTT)as well as completely eliminate tumors in animal models without toxic side effects.Depositing Pd clusters on both tips of Au NRs offers Pd-Au NRs three novel functions,i.e.,the extension of the absorption into NIR-Ⅱ region,the activation of prodrug of 5-fluorouracil(5-Fu)via the bioorthogonal reaction,and the peroxidase-mimic activity to produce·OH.The heterogeneous nanorods showed a high and stable photothermal conversion efficiency(52.07%)in a safer NIR-Ⅱ irradiation region(1,064 nm),which not only eliminate most of tumor cells at only one dose of the irradiation for 5 min but also improve the in situ conversion of 5-fluoro-1-propargyluracil and H2O2 into active 5-Fu and·OH to eradicate residual tumors for inhibiting tumor metastasis.This dual catalytic activity-synergistic mechanism of PTT demonstrates the importance of material design in solving current bottleneck problem of tumor therapy.
