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China’s Energy Transition Pathway in a Carbon Neutral Vision

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Engineering 2022年第7期8卷 64-76页

作者： shu zhang Wenying Chen Institute of Energy Environment and EconomyTsinghua UniversityBeijing 100084China

China’s energy system requires a thorough transformation to achieve carbon ***,leveraging the highly acclaimed the Integrated MARKAL-EFOM System model of China(China TIMES)that takes energy,the environment,and the economy into consideration,four carbon-neutral scenarios are proposed and compared for different emission peak times and carbon emissions in *** results show that China’s carbon emissions will peak at 10.3–10.4 Gt between 2025 and *** 2050,renewables will account for 60%of total energy consumption(calorific value calculation)and 90%of total electricity generation,and the electrification rate will be close to 60%.The energy transition will bring sustained air quality improvement,with an 85%reduction in local air pollutants in 2050 compared with 2020 levels,and an early emission peak will yield more near-term *** peak attainment requires the extensive deployment of renewables over the next decade and an accelerated phasing out of coal after ***,it will bring benefits such as obtaining better air quality sooner,reducing cumulative CO_(2) emissions,and buying more time for other sectors to *** pressure for more ambitious emission reductions in 2050 can be transmitted to the near future,affecting renewable energy development,energy service demand,and welfare losses.

关键词： Carbon neutrality Energy transition Climate change mitigation China TIMES model Synergistic effects

Clinical considerations of anticoagulation therapy for patients with atrial fibrillation

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第8期13卷 609-615页

作者： shu zhang Arrhythmias Center and Clinical EP Lab. Cardiovascular Institute and Fuwai HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China

Atrial fibrillation (AF) increases the risk of stroke. New anticoagulation agents have recently provided alternative and promising approaches. This paper reviews the current state of anticoagulation therapy in AF patients, focusing on various clinical scenarios and on comparisons, where possible, between western and eastern populations.

关键词： Anticoagulation therapy Atrial fibrillation,Warfarin Dabigatran Riveroxaban Apixaban

Fault Feeder Identification in Non-effectively Grounded Distribution Network with Secondary Earth Fault

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 1137-1148页

作者： shu zhang Tianlei Zang Wenhai zhang Xianyong Xiao Department of Electrical Engineering Sichuan UniversityChengduChina

Secondary earth faults occur frequently in power distribution networks under harsh weather *** to its characteristics,a secondary earth fault is typically hidden within the transient of the first ***,most researchers tend to focus on a feeder with single fault while disregarding secondary *** paper presents a fault feeder identification method that considers secondary earth faults in a non-effectively grounded distribution ***,the wavelet singular entropy method is used to detect a secondary fault *** method can identify the moment at which a secondary fault *** zero-sequence current data can be categorized into two fault *** first and second fault stages correspond to the first and secondary faults,***,a similarity matrix containing the time-frequency transient information of the zero-sequence current at the two fault stages is defined to identify the fault ***,to confirm the effectiveness and reliability of the proposed method,we conduct simulation experiments and an adaptability analysis based on an electromagnetic transient program.

关键词： Secondary earth fault non-effectively grounded distribution network wavelet singular entropy similarity matrix zero-sequence current

Random Neighbor Sandpile Model with Constrained Total Energy

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Chinese Physics Letters 2000年第1期17卷 37-39页

作者： zhang shu-Dong Institute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing 100875

We propose an energy-constrained sandpile model with random *** critical behavior of the model is in the same universality class as the mean-field self-organized criticality *** critical energy Ec depends on the number of neighbors n of each site,but the various exponents do *** n=6,we got that Ec=0.4545;and a sei匸similar structure of the energy distribution function with five major peaks is also *** is a natural result of system dynamics and the way the system is disturbed.

关键词： system neighbor critical

Oscillation control for n-dimensional congestion control model via time-varying delay

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Science China(Technological Sciences) 2011年第8期54卷 2044-2053页

作者： zhang shu XU Jian School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai 200092 China

Time delay or round trip time (RTT) is an important parameter in the model of Internet congestion control. On the one hand, the delay may induce oscillation via the Hopf bifurcation. In the present paper, a congestion control model of n dimensions is considered to study the delay-induced oscillation. By linear analysis of the n-dimensional system, the critical delay for the Hopf bifurcation is obtained. To describe the relation between the delay and oscillation analytically, the method of multiple scales (MMS) is employed to obtain the bifurcating periodic solution. On the other hand, it can be understood that the oscillation will increase the risk of congestion for the network system. To avoid the congestion derived from the oscillation, a new control scheme is proposed by perturbing the delay periodically. Particularly, according to our study, it is possible to control the oscillation by perturbing only one of the n delays. This provides a practical scheme for the oscillation control in the real network system. By MMS, the strengths of the perturbations are predicted analytically such that the oscillation disappears. To give an example, an eight-dimensional model is studied in detail. The analytical results are in good agreement with the numerical simulations.

关键词： internet congestion control high-dimensional system Hopf bifurcation time-varying delay method of multiple scales

Petrology and Geochemistry of the Huangshan Granitic Intrusion in Anhui Province,Southeast China:Implications for Petrogenesis and Geodynamics

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Acta Geologica Sinica(English Edition) 2010年第3期84卷 581-596页

作者： zhang shu zhang Zhaochong State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China

The Huangshan granitic intrusion in Anhui province,SE China,is tectonically located at the southeastern boundary of the Yangtze *** on the contact relation and the petrography,the Huangshan granitic intrusion can be divided into four stages,from early to late,medium-grained monzogranite,coarse-grained porphyric granite,fine-medium grained porphyric granite,and finecoarse grained *** rocks from the Huangshan granitic intrusion display similar petrological and geochemical characteristics,*** high SiO_2（〉75%） and alkali（7.85%-8.59%）,low CaO （〈1%）,high Fe-number（FeO_T/（MgO＋FeO_T） = 0.93-0.97） and A/CNK（atomic Al/（Ca＋Na＋K））=1.04- *** are also enriched in rare earth elements（REE,except for Eu,with a total REE contents ranging from 116 ppm to 421 ppm）,high strength field elements such as Zr,Hf,Nb,but depleted in Ba,Sr and *** 10 000×Ga/Al ratios are higher than 2.6,which are consistent with the A-type *** on the classification diagrams proposed by Eby,the Huangshan granite can be classified into the A2 group,which is usually believed to be formed under an extensional tectonic *** Nd isotopic compositions suggest that the primary magmas of the Huangshan granite are predominantly derived from the Proterozoic andesitic rocks in the region,and this conclusion is also supported by REE *** systemic investigations on the geochemistry of the Huangshan granitic intrusion can provide significant implications for the understanding of the petrogenesis and the geodynamic regime of southeastern China during the Late-Mesozoic.

关键词： Huangshan granitic intrusion A-type granitoids geochemistry Late-Mesozoic,lithospheric extension

Insight-HXMT Research Progress Since 2023

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空间科学学报 2024年第4期44卷 643-667页

作者： zhang shu zhang shuang-Nan Key Laboratory for Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049

Since the launch in June 2017,Insight-HXMT has been in service smoothly in orbit and particularly productive in 2023 and *** a total number of 238 papers published so far based on Insight-HXMT data,63 were published in 2023,and 32 in the early 2024(till 2024 April),accounting for 40%of the *** studies cover a variety of scientific subjects including the basic properties of black holes and neutron stars,the outburst of accreting black hole and neutron star X-ray binaries,thermal nuclear burst probes,isolated pulsars,quasi periodical oscillations,cyclotron resonant scattering features,fast radio bursts and gamma-ray bursts,*** paper introduces the overall progress with focus on some potential breakthroughs.

关键词： Insight-HXMT Black hole Neutron star Outburst

Intraspecific differences in effects of co-contamination of cadmium and arsenate on early seedling growth and metal uptake by wheat

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Journal of Environmental Sciences 2007年第10期19卷 1221-1227页

作者： LIU Xiao-li zhang shu-zhen State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

A hydroponic experiment was carried out to study intraspecific differences in the effects of different concentrations of cadmium （Cd）（0-10 mg/L） and arsenate （As（V））（0-8 mg/L） on the growth parameters and accumulation of Cd and As in six wheat varieties Jing- 9428, Duokang- 1, Jingdong- 11, Jing-411, Jingdong-8 and Zhongrnai-8. The endpoints of wheat seedlings, including seed germination, biomass, root length and shoot height, decreased with increasing the Cd and As concentrations. Significant differences in seed germination, biomass, root length, shoot height and the accumulation of Cd and As were observed between the treatments and among the varieties （p 〈 0.05）. The lethal dosage 50% were about 20, 80, 60, 60, 80 and 20 mg As/L for Jing-9428, Duokang-1, Jingdong-11, Jing-411, Jingdong-8 and Zhongrnai-8, respectively, and the corresponding values for Cd were about 30, 80, 20, 40, 60 and 10 mg Cd/L, respectively. Among the six varieties, Duokang-1 was found to be the most resistant to Cd and As toxicity, and Zhongrnai-8 was the most sensitive to Cd and As co-contamination. The resistance of the six varieties was found dependant on the seedling uptake of Cd and As. Duokang-1 was the most suitable for cultivation in Cd and As co-contaminated soils.

关键词： Cd As varieties co-contamination wheat seedling

Suppression of oscillatory congestion via trunk link bandwidth and control gain in star network

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Applied Mathematics and Mechanics(English Edition) 2019年第1期40卷 25-48页

作者： Sainan WANG shu zhang Jian XU School of Aerospace Engineering and Applied Mechanics Tongji University

The time delay-induced instability in an Internet congestion control model is investigated. The star topology is considered, and the link bandwidth ratio and the control gain are selected as the tunable parameters for congestion suppression. The stability switch boundary is obtained by the eigenvalue analysis for the linearized system around the equilibrium. To investigate the oscillatory congestion when the equilibrium becomes unstable, the center manifold reduction and the normal form theory are used to study the periodic oscillation induced by the delay. The theoretical analysis and numerical simulation show that the ratio between bandwidths of the trunk link and the regular link,rather than these bandwidths themselves, is crucial for the stability of the congestion control system. The present results demonstrate that it is not always effective to increase the link bandwidth ratio for stabilizing the system, and for some certain delays, adjusting the control gain is more efficient.

关键词： Internet congestion control Hopf bifurcation delayed differential equation stability normal form