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A four-dimensional interaction-based appraisal approach towards the performance enhancement of a vehicular waste heat recovery system

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Science China(Technological Sciences) 2022年第12期65卷 2921-2941页

作者： LU BoWen SHI LingFeng TIAN Hua wang xuan ZHANG MeiYan SHU GeQun Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Engines Tianjin UniversityTianjin 300072China

The non-linear multifactorial impacts on fuel-saving potential constrain the practical performance of the vehicular waste heat recovery system(WHRS). This study proposed a four-dimensional interaction-based appraisal approach to interpreting these impacts for enhancing WHRS's in-vehicle performance. The interaction incorporates a heat exchanger, configuration, engine,and vehicle. The proposed approach comprises two successive steps, emphasizing evaluation under the rated(Step 1) and off-design(Step 2) heat source conditions. A case study of waste heat recovery from a passenger vehicle was conducted to evaluate the in-vehicle performance of a novel co-split system and two single-split ones(with/without a regenerator) through this approach. The novel system theoretically modifies vehicular performance but remains ambiguous concerning real-world behaviour, which is assessed and verified by the proposed approach. Two key factors determining vehicular performance were identified by Step 1, namely, net power output and engine backpressure. As the co-split system modified both factors, its fuel-saving potential could be increased by up to 20.3% compared with single-split systems. Also, the limiting factor for off-design performance was pinpointed by Step 2, namely, the mismatch between the heat source and working fluid, which led to the solution, i.e., the synergistic split regulation of the working fluid and heat source. An up to 8.8% improvement in net power output was achieved by the co-split system at off-design heat sources compared with fixed split ratios. Consequently, the approach enables holistic performance improvement of the vehicular WHRS under design/off-design heat source conditions.

关键词： waste heat recovery passenger vehicle in-vehicle scenario dual heat source operational flexibility

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Analysis of an electricity-cooling cogeneration system for waste heat recovery of gaseous fuel engines

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Science China(Technological Sciences) 2015年第1期58卷 37-46页

作者： SHU GeQun wang xuan TIAN Hua LIANG YouCai LIU Yu LIU Peng State Key Laboratory of Engines Tianjin University

Waste heat recovery(WHR)is one of the most useful ways to improve the efficiency of internal combustion engines,and an electricity-cooling cogeneration system(ECCS)based on Rankin-absorption refrigeration combined cycle for the WHR of gaseous fuel engines is proposed in the *** system can avoid wasting the heat in condenser so that the efficiency of the whole WHR system improves,but the condensing temperature of Rankin cycle(RC)must increase in order to use absorption refrigeration system,which leads to the decrease of RC output ***,the relationship between the profit of absorption refrigeration system and the loss of RC in this combined system is the mainly studied content in the *** the energy quality of cooling and electricity are different,cooling power in absorption refrigeration is converted to corresponding electrical power consumed by electric cooling system,which is defined as equivalent electrical *** this method,the effects of some important operation parameters on the performance of the ECCS are researched,and the equivalent efficiency,exergy efficiency and primary energy rate are compared in the paper.

关键词： gaseous fuel engines waste heat recovery electricity-cooling cogeneration Rankin cycle absorption refrigeration

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The depletion of coastal environmental resources by human activities and its monetary evaluation

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Ecological Economy 2007年第1期3卷 67-76页

作者： wang xuan Chen Weiqi Environmental Science Research Center Xiamen University Xiament 361005P.R.China

The marine environment provides rich and varied resources and services or functions for human’s produc-tion and life. Many countries have competitively exploited and utilized sea and ocean to develop marine economy for someyears. The over-exploitation of marine environment and the overuse of marine resources have led to resource degradation,environmental pollution and ecosystem destruction. Considering the depletion of coastal environmental resources dur-ing planning, governing and decision-making is an important measure to promote the harmonious and sustainabledevelopment of coastal environmental resources and social economy, the main precondition of which is that the depletionof coastal environmental resources by human activities has been monetarily evaluated. Firstly, this paper summarizesrelevant references in this field and analyzes different sorts of depletion of coastal environmental resources caused byhuman activities and the necessity and importance of the monetary evaluation. Finally, this paper extensively discussesthe corresponding evaluation models of the depletion of marine mineral resources, marine organism resources, mari-time transport resources, intertidal zones and shallow seas, and marine environmental functions and services includingenvironmental capacity, gas regulation, disturbance prevention, recreation and biodiversity.

关键词： Coastal environmental resources Depletion Monetary evaluation Human activities

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Aperture-averaged scintillation index and fade statistics in weak oceanic turbulence

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Chinese Physics B 2021年第6期30卷 320-328页

作者： Hao wang Fu-Zeng Kang xuan wang Wei Zhao Shu-Wei Sun State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi'an 710119China University of Chinese Academy of Sciences Beijing 100049China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

With the rapid demand for underwater optical communication(UOC), studies of UOC degradation by oceanic turbulence have attached increasing attention worldwide and become a research hot-spot in recent years. Previous studies used a simplified and inaccurate oceanic turbulence spectrum, in which the eddy diffusivity ratio between temperature and salinity is assumed to be unity and the outer scale of turbulence is assumed to be infinite. However, both assumptions are not true in most of the actual marine environments. In this paper, based on the Rytov theory in weak turbulence, we derive analytical expressions of "the aperture-averaged scintillation index"(SI) for both plane and spherical waves, which can clearly demonstrate how SI is influenced by several key factors in UOC. Then, typical fade statistics of the UOC system in weak turbulence is discussed including the probability of fade, the expected number of fades per time, the mean fade time,signal-to-noise ratio and bit error rate. Our results show that spherical wave is preferable in the UOC system in weak turbulence compared to plane wave, and the aperture-averaged effect has a significant impact on UOC system's *** results can be used to determine those key parameters for designing the UOC system over reasonable ranges.

关键词： underwater optical communication(UOC) aperture-averaged scintillation index fade statistics

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Recognition of mortar pumpability via computer vision and deep learning

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Journal of Electronic Science and Technology 2023年第3期21卷 73-81页

作者： Hao-Zhe Feng Hong-Yang Yu Wen-Yong wang Wen-xuan wang Ming-Qian Du Research Institute Electronic Science and Technology University of Electronic Science and Technology of ChinaChengdu611731China School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China The Second Research Institute of Civil Aviation Administration of China Chengdu610041China

The mortar pumpability is essential in the construction industry,which requires much labor to estimate manually and always causes material *** paper proposes an effective method by combining a 3-dimensional convolutional neural network(3D CNN)with a 2-dimensional convolutional long short-term memory network(ConvLSTM2D)to automatically classify the mortar *** results show that the proposed model has an accuracy rate of 100%with a fast convergence speed,based on the dataset organized by collecting the corresponding mortar image *** work demonstrates the feasibility of using computer vision and deep learning for mortar pumpability classification.

关键词： Classification Computer vision Deep learning Pumpability 2-dimensional convolutional long short-term memory network (ConvLSTM2D) 3-dimensional convolutional neural network(3D CNN)

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Iteration dependent interval based open‐closed‐loop iterative learning control for time varying systems with vector relative degree

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CAAI Transactions on Intelligence Technology 2023年第3期8卷 645-660页

作者： Yun‐Shan Wei Jin‐Fan wang Jia‐xuan wang Qing‐Yuan Xu Jaime Lloret School of Electronics and Communication Engineering Guangzhou UniversityGuangzhouChina School of Electronic and Information Guangdong Polytechnic Normal UniversityGuangzhouChina Universitat Politècnica de València ValenciaSpain

For linear time varying(LTV)multiple input multiple output(MIMO)systems with vector relative degree,an open‐closed‐loop iterative learning control(ILC)strategy is developed in this article,where the time interval of operation is iteration *** compensate the missing tracking signal caused by iteration dependent interval,the feedback control is introduced in ILC *** the tracking signal of many continuous iterations is lost in a certain interval,the feedback control part can employ the tracking signal of current iteration for *** the assumption that the initial state vibrates around the desired initial state uniformly in mathematical expectation sense,the expectation of ILC tracking error can converge to zero as the number of iteration tends to *** the circumstance that the initial state varies around the desired initial state with a bound,as the number of iteration tends to infinity,the expectation of ILC tracking error can be driven to a bounded range,whose upper bound is proportional to the *** is revealed that the convergence condition is dependent on the feed-forward control gains,while the feedback control can accelerate convergence speed by selecting appropriate feedback control *** a special case,the controlled system with integrated high relative degree is also addressed by proposing a simplified iteration dependent interval based open‐closed‐loop ILC ***,the effectiveness of the developed iteration dependent interval based open‐closed‐loop ILC is illustrated by a simulation example with two cases on initial state.

关键词： intelligent control iterative methods

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Effects of MCI-186 on intracellular calcium ion concentration and membrane fluidity of hippocampal neurons in a rat model of Alzheimer's disease

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Neural Regeneration Research 2011年第29期6卷 2245-2250页

作者： Ming Yu Lei Qin Zhao wang Xiaohong Lu Ying Zhu Wenhui Leng xuan wang Department of Neurology Affiliated Hospital of Jiangsu University Zhenjiang 212001 Jiangsu Province China Department of Preventive Medicine Nanjing University of Chinese Medicine Nanjing 210046 Jiangsu Province China Department of Biochemistry Basic Medical College of Jiamusi University Jiamusi 154007 Heilongjiang Province China Department of Neurology Affiliated First Hospital of Jiamusi University Jiamusi 154002 Heilongjiang Province China

The present study observed the effects of MCI-186 on the intracellular calcium ion concentration （[Ca2＋]i） and membrane fluidity of hippocampal neurons in Alzheimer＇s disease （AD） model rats to validate the neuroprotective effects of MCI-186. Compared with normal and sham-operated rats, the escape latency was obviously prolonged, spanning platform times were obviously reduced, [Ca2＋]i was increased, and microviscosity η value was increased in AD rats. MCI-186 at 0.5 mg/mL and 0.2 mg/mL obviously shortened escape latency, increased spanning platform times and decreased [Ca2＋]i and microviscosity η values in AD rats at 7 and 17 days after induction of the model. The differences in the above-mentioned indices between normal and MCI-186-treated rats were statistically significant. MCI-186 at 0.2 mg/mL yielded better curative effects than 0.5 mg/mL MCI-186. These findings suggest that MCI-186 improves learning and memory abilities in AD rats by decreasing [Ca2＋]i and increasing membrane fluidity of hippocampal neurons.

关键词： MCI-186 Alzheimer's disease learning memory calcium ion neurodegenerative diseases neural regeneration

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Side population cells isolated from KATO Ⅲ human gastric cancer cell line have cancer stem cell-like characteristics

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World Journal of Gastroenterology 2012年第33期18卷 4610-4617页

作者： Jun-Jun She Peng-Ge Zhang xuan wang Xiang-Ming Che Zi-Ming wang Department of General Surgery First Affiliated Hospital of Medical College Xi'an Jiaotong University Xi'an 710061 Shaanxi Province China

AIM: To investigate whether the side population (SP) cells possess cancer stem cell-like characteristics in vitro and the role of SP cells in tumorigenic process in gastric cancer. METHODS: We analyzed the presence of SP cells indifferent human gastric carcinoma cell lines, and then isolated and identified the SP cells from the KATO Ⅲ human gastric cancer cell line by flow cytometry. The clonogenic ability and self-renewal were evaluated by clone and sphere formation assays. The related genes were determined by reverse transcription polymerase chain reaction. To compare tumorigenic ability, SP and non-side population (NSP) cells from the KATO Ⅲ human gastric cancer cell line were subcutaneously injected into nude mice. RESULTS: SP cells from the total population accounted for 0.57% in KATO Ⅲ, 1.04% in Hs-746T, and 0.02% in AGS (CRL-1739). SP cells could grow clonally and have self-renewal capability in conditioned media. The expression of ABCG2, MDRI, Bmi-1 and Oct-4 was different between SP and NSP cells. However, there was no apparent difference between SP and NSP cells when they were injected into nude mice. CONCLUSION: SP cells have some cancer stem celllike characteristics in vitro and can be used for studying the tumorigenic process in gastric cancer.

关键词： Side population Cancer stem cells Selfrenewal Gastric cancer KATO Ⅲ

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Towards relieving center segregation in twin-roll cast Al-Mg-Si-Cu strips by controlling the thermal-mechanical process

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Journal of Materials Science & Technology 2023年第17期148卷 31-40页

作者： Shao-You Zhang xuan wang Yuan-Ting Mo Cheng wang Tuo Cheng Orest Ivasishin Pin-Kui Ma Hui-Yuan wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityChangchun 130025China International Center of Future Science Jilin UniversityChangchun 130012China

Serious center segregation greatly limits the application of twin-roll casting(TRC)technology for produc-ing 6xxx alloy ***,Al-0.9Mg-0.6Si-0.2Cu-0.1Fe(wt.%,6061)strips with different thicknesses were fabricated by TRC,and we found that the center segregation was well relieved with the thick-ness increased from 3 mm to 4 *** reveal the mechanisms of mitigation of center segregation in the 4 mm strip,various techniques including solidification simulation,crystallographic calculation,elec-tron backscatter diffraction(EBSD),and electron probe micro-analyzer(EPMA)were *** re-sults disclosed that the Fe-containing phase in the 3 mm strip wasπ-AlFeMgSi,while the counterpart in the 4 mm strip wasα-***α-AlFeSi could serve as nucleation substrates for Mg_(2)Si and Q-AlCuMgSi phases,thus promoting the uniform distribution of elements and preventing the accumulation of phases in the center *** matching planes between theα-AlFeSi and Q/Mg_(2)Si were exam-ined as:(1120)_(α-AlFeSi)//(0001)_(Q),(0001)_(α-AlFeSi)//(110)_(Mg2Si),and(1120)_(α-AlFeSi)//(110)_(Mg2Si).Meanwhile,the smaller roll separating force during the TRC process in the 4 mm strip could weaken the force-induced liquid flow behavior in the semi-solid region,which is the other reason for the alleviation of center *** to the elimination of the center segregation,a more excellent fracture elongation was achieved in the as-homogenized 4 mm strip(∼29%)compared with the counterpart of the 3 mm strip(∼20%).This work may provide a strategy to eliminate the center segregation,thus further promoting the application of TRC process and producing high-performance Al alloy strips efficiently.

关键词： Aluminum alloy Twin-roll casting Center segregation Fe-containing phase Nucleation substrate

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Effect of Water Deficit on Self-thinning Line in Spring Wheat （Triticum aestivum L.） Populations

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Journal of Integrative Plant Biology 2006年第4期48卷 415-419页

作者： Jing Liu Liang Wei Chun-Ming wang Gen-xuan wang Xiao-Ping Wei Key Laboratory of Arid and Grassland Ecology Lanzhou University Ministry of Education Lanzhou 730000 China College of Life Sciences Zhejiang University Hangzhou 310027 China School of Life Sciences Lanzhou University Lanzhou 730000 China

Monocultures of spring wheat （Triticum aestivum L.） were grown at overcrowded densities （10 000 and 3 000 plants per m^2） under well-watered and water-stressed conditions to investigate the effects of water deficits on self-thinning. The results showed that density reduction in water-stressed populations was delayed compared with that In well-watered populations. Populations grown In well-watered conditions conformed to the -3/2- power law. Compared with the well-watered condition, there was no significant decrease of the self-thinning line under water-stressed conditions In this experiment, although the rate of average shoot blomass accumulatlon decreased. This result Implied that the exponent of the -3/2-power equation Is not as sensitive as the rate of average shoot blomass accumulation to water stress. Further analysis indicated that, In each density treatment, the lines of the height versus shoot blomass relationships did not differ significantly between the two water conditions. However, the Intercepts of the height versus shoot blomass relationships were greater In the higher-density populations （10 000/m^2） than those In the lower-density populations （3 000/m^2）. These results showed that water deficit did not change plant geometry In this experiment. That Is to say, shoot competition for light remains constant at a given blomass, although root competition for water becomes more serious In water deficit conditions. Based on these results and previous reports we propose that, to affect the thinning line slope, changes In symmetric competition are not as efficient as changes In asymmetric competition.

关键词： -3/2-power rule competition density self-thinning water deficit.

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