mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
The sub-fossils of leaf fragments in sediments as an indicator of mangrove development in the Yingluo Bay, Guangxi, Southwest China over the last 130 years

Located in the intertidal zone of the tropical and subtropical coasts, mangrove forests are an important ecosystem in the global carbon cycle and serve as a protector of local seashores. Under the double impacts of climate change, especially sea-level rise, and human activity, mangrove forests around the world have faced degradation, against which the reconstruction of the historical development of mangrove forests using an effective indicator has been regarded as a necessary strategy for designing a predictable model. As the primary product of mangrove forest, it is reasonable that the content of leaf fragments of mangrove (CLFM) buried in sediments in the form of sub-fossils potentially has the same indicative function for the development of mangrove forests as that of widely-used mangrove pollen. In this study, the leaf fragments of mangrove in two sediment cores (YLW02 and YLW03) drilled in the Yingluo Bay in Guangxi, Southwest China were picked out and weighted for calculation of CLFM, which was used as an indicator of mangrove development after examination of parallelism and a statistical correlation of the CLFM with the concentration of mangrove pollen. The results clearly show that the vertical distribution of the CLFM for the core taken from the landward margin of mangrove forests (YLW03) only parallels that of the local mangrove species (Rhizophora. stylosa) with a significantly positive correlation (R=0.56, P=0.05), while the vertical distribution of the CLFM for the core taken from the interface between seaward margin of mangrove forest and the trunk of tidal creeks of the bay (YLW02) parallels the summed concentration of mangrove pollen (SCMP) with a more positive correlation than that of YLW03 (R=0.85, P=0.01), indicating that the trunk outlet of tidal creeks must have been the site where mangrove production gathered from the overall forest rather than from local production. The variations in the CLFM of both cores indicate that overall the mangrove forests in the Yingluo Bay have increasingly flourished over the last 130 years except for the interval of 1940–1950 AD in response to an increase in air temperature and decrease in rainfall, which would have resulted in an increase in seawater salinity; while the coupled extreme increases in air temperature and in rainfall in summer, which would have resulted in extreme decreases in seawater salinity, would be responsible for the relative degradation of mangrove forests in the interval of 1940–1950 AD.
Distribution, residence time, autotrophic production, and heterotrophic removal of DOP in the Mirs Bay, northern South China Sea

The importance of dissolved organic phosphorus (DOP) as a potential nutrient source for primary producers in marine systems has been recognized for up to eight decades, but currently, the understanding of the biogeochemistry of DOP is in its infancy. In the present study, monthly data between 2000 and 2014 were used to analyze the temporal and spatial distributions of DOP in the Mir Bay, the northern South China Sea. The DOP residence time (TDOP) was also investigated using a simple regression analysis in combination with chlorophyll a (Chl a) measurements while excess DOP (ΔDOP), produced by the biogeochemical processes of autotrophic production and heterotrophic removal, was determined using a two-component mixing mass-balance model in combination with salinity measurements. The results showed that the DOP concentration was (0.017±0.010) mg/L higher in the surface-water compared with the bottom-water and higher in the inner Tolo Harbour and waters adjacent to Shatoujiao compared with the main zone of the bay. Although seasonal changes and annual variability in the DOP were small, the surface DOP concentration was higher in the wet season (April–September) than in the dry season (October–March) due to the impacts of seaward discharges and atmospheric deposition into the bay. Measurement and regression results showed that the DOP release rate from phytoplankton production was about 1.83 (g P)/(g Chl a) and the T_(DOP) was about 7 d, which implied that the DOP cycle in the bay was rapid. The ΔDOP was calculated from the model to be about 0.000 mg/L in the main zone of the bay and about 0.002 mg/L in the inner Tolo Harbour and waters adjacent to Shaotoujiao, suggesting that the autotrophic production of DOP was almost balanced by the heterotrophic removal in the main zone of the bay and dominated in the inner Tolo Harbour and waters adjacent to Shaotoujiao. In conclusion, the Mirs Bay is very productive and fairly heterotrophic.
Safeguarding Traditional Villages in China: The Role and Challenges of Rural Heritage Preservation

Since the reform and opening-up policy of 1978, China has established the double-track inventory system of rural heritage preservation to cope with the impact of rapid urbanisation on rural areas. This paper analyses the evolution in the concept of policy making from the Historical and Cultural Villages system to the Traditional Villages system. It argues that the mass recognition of Traditional Villages in China since 2012 indicates that the understandings of rural heritage have evolved from the distinguished to the diverse, the tangible only to the intangible included, and the material-based to the human-based. Under the rural revitalisation policy, the role of Traditional Villages in social development will be further explored and promoted as 'means of improvement; looking for the balance between protection and development of rural heritage in the urban-rural dual structure.
The Promotion of Building Culture in Rural Germany

Over the past two decades, building culture has increasingly caught the attention of the architectural and planning professions. The building culture is to be understood in the broadest sense as the sum of all cultural, economic, technological, social and ecological factors influencing the quality and process of planning and construction. While the revitalisation and promotion of building culture is central to discussions on urban areas, these are generally ignored in regard to rural areas. This article aims to provide an overview of how building culture has been promoted in Germany's rural areas, thereby contributing to international research on this topic. The paper adopts a general descriptive approach in examining the promotion of building culture in rural Germany. It provides background knowledge on institutional promotion and demonstrates the diverse approaches implemented in representative villages as best practices examples. The German experience confirms that the promotion of building culture is a meaningful and effective measure to help revitalise rural areas. Moreover, the three selected rural municipalities show how stakeholders from civil society are increasingly involved in measures to implement and promote building culture in the local context.
On the mechanism and control for the ultra-low frequency oscillation in NY Power Grid with large-scale hydropower

The power grid with large proportion of hydropower may engage the ultra-low frequency oscillation (ULFO), which threatening the operation of system. To the NY Power Grid system, whose dimension is over thousands, this paper reveals the cause of ULFO with the phase portrait method, i.e., lies in the saturation of the different limits of the governor system of the generators, in other words, the occurrence of limit cycle is due to the non-smooth bifurcation. And furthermore, it proposes two methods to suppress ULFO with the philosophy of destroying the condition of non-smooth bifurcation. In detail, first, the phenomenon of ULFO in NY Power Grid, the damping characteristics and the limits in the governor system of the hydropower units are presented. Second, based on the non-smooth bifurcation theory, the mathematical basis of the oscillation in the non-smooth system caused by the saturation of limits is introduced. And then, the non-oscillation and oscillation dynamic of the system corresponding to without/with limits in the governor system are analyzed. Furthermore, it discusses the influence of the saturation of single limit on the characteristics of ULFO with the phase portraits. Moreover, the phase portraits of the ULFO under different faults is analyzed, and it shows that the limiting saturation occurs with a large enough disturbance. Thus, the ULFO is resulting from the negative damping of generation and the saturation of multiple limits under a large enough disturbance. In addition, according to the above mechanism, two strategies to suppress the ULFO, i.e., the governor parameters tuning and the fault strength relief are designed. The simulation shows the effectiveness of proposed strategies.
Five new polyhydroxylated furostanol saponins from the rhizomes of Tupistra chinensis

Five new polyhydroxylated furostanol saponins were isolated from the roots and rhizomes of Tupistra chinensis, and their structures were determined as tupistrosides J–N (1–5), together with four known furostanol saponins (6–9), on the basis of physico- chemical properties and spectral analysis. Among them, compounds 3 and 5 showed cytotoxicity against human cancer cell lines SW620 with IC_(50) values of 72.5 ± 2.4 and 77.3 ± 2.5 μmol·L~(-1), respectively. Compound 4 showed cytotoxicity against human cancer cell line HepG2 with IC_(50) value of 88.6 ± 2.1 μmol·L~(-1).
Picropodophyllin inhibits type I endometrial cancer cell proliferation via disruption of the PI3K/Akt pathway

The type-I insulin-like growth factor receptor (IGF-IR) is overexpressed in endometrial cancer.High IGF-IR expression was considered as an important prognostic factor for tumor progression.The purpose of this study was to investigate the role and molecular mechanism of IGF-IR inhibitor picropodophyllin (PPP) in the growth and development of endometrial cancer.High expression of IGF-IR was observed in endometrial cancer tissues,as well as in ECC-1 and KLE cell lines.PPP suppressed the number of clones of ECC-1 and KLE cell lines;however,it had no significant effect on HEC-1-A cell line,which expressed lower IGF-IR than ECC-1 and KLE cell lines.Furthermore,PPP reduced cell proliferation capacity,inhibited the IGF-IR mRNA expression,and suppressed protein phosphorylation of IGF-IR and Akt in the three cell lines.In addition,PPP inhibited the protein expression of survivin in KLE cell line after 1 h of exposure,though this effect did not last for prolonged time.In conclusion,IGF-IR was mostly overexpressed in type I endometrial cancer.High IGF-IR expression was an important prognostic factor of tumor progression.PPP mediated the down-regulation of IGF-IR phosphorylation and inhibited cell proliferation via the PI3K/Akt signal pathway.PPP may have the potential to become a clinical treatment target in endometrial carcinoma.
抗苗勒氏管激素在不同卵巢储备功能患者的表达及相关性分析

目的了解抗苗勒氏管激素(AMH)在多囊卵巢综合征(PCOS),卵巢功能不全(POI)和正常对照组三组间的表达差异。方法将2017年1月至2018年5月就诊于北京市通州区妇幼保健院的18-40岁育龄期100例女性进行血清AMH、女性激素及窦卵泡数(AFC)测定。结果PCOS组AMH水平最高、POI组最低。PCOS组T、E2明显高于POI组与对照组,对照组明显高于POI组,差异有统计学意义(P < 0.01);POI组FSH、LH水平高于PCOS组和对照组,差异均有统计学意义(P < 0.01);PCOS组AFC明显高于另外两组,差异有统计学意义(P < 0.01)。POI组AFC明显低于正常对照组(P < 0.01)。AMH水平与AFC、E2、T间呈明显正相关,与年龄、FSH及LH间呈明显负相关,差异均有统计学意义(P < 0.01)。结论AMH水平随年龄呈下降趋势;年龄增长,卵巢储备功能随之下降;PCOS组患者的AMH高于正常水平,且在三组间处于最高水平; AMH水平在三种不同卵巢储备功能患者人群中有明显差异,且与年龄、女性基础激素及AFC有明显相关性。
限制性液体复苏与积极液体复苏救治产科失血性休克的血液动力学比较

目的比较限制性液体复苏与积极液体复苏救治产科失血性休克的血液动力学变化。方法选择辽宁省抚顺矿务局总医院2014年5月至2018年2月诊治的采用限制性液体复苏治疗的42例失血性休克产妇为研究组,同期采用积极性液体复苏治疗的51例失血性休克产妇为对照组。对比两组产妇治疗后30、120 min血流动力学指标[收缩压(SBP)、舒张压(DBP)、平均动脉压(MAP)、心率(HR)、中心静脉压(CVP)]的差异。结果研究组患者输液量、出血量、输血量明显低于对照组[(1 305.58±392.02)ml vs(1 825.51±613.62)ml、 (1 523.85±159.35)ml vs(2 014.52±228.73)ml、(1 021.09±108.55)ml vs(1 824.95±364.88)ml,P < 0.05]。两组患者经液体复苏治疗后120 min SBP、DBP、MAP、CVP均显著上升(P < 0.05),HR显著下降(P < 0.05),研究组复苏治疗后30、120 min SBP、DBP、MAP、CVP均高于对照组(P < 0.05),HR均低于对照组(P < 0.05)。研究组复苏治疗后ARDS、MODF、死亡发生率明显低于对照组( 0.00% vs 11.76%、2.37% vs 15.69%、0.00% vs 9.80%,P < 0.05),ARF发生率与对照组无差异(2.38% vs 13.73%,P > 0.05)。结论限制性液体复苏可降低失血性休克产妇出血量、输血量、并发症和病死率,对血流动力学的改善效果优于积极液体复苏治疗。
Hydrochlorination of acetylene over the Ru-based catalysts treated by plasma under different atmospheres

Ru-based catalysts modified in different atmospheres by plasma technology were prepared to catalyze the acetylene hydrochlorination reaction. The (Ru/AC)-N_2 (AC = activated carbon) catalyst yielded by the plasma modification of Ru/AC catalyst in N_2 atmosphere exhibits the best catalytic performance with a stable C_2H_2 conversion of 87.2%; a relative increase of 27.1% in C_2H_2 conversion was achieved compared with that of the untreated Ru/AC catalyst. The results of the analysis revealed that the modification produced a mutual effect between the generated function groups on carrier AC and the active components, which can disperse and yield more active species in the fresh catalysts. These are benefits of enhancing the activity of the catalysts. Moreover, the modification can restrain coke formation and inhibit the loss of active species in the reaction, as well as strengthen the adsorption ability of reactants on the catalysts. These are benefits of improving the catalysts' performance.
Effects of Ni Content and Ball Milling Time on the Hydrogen Storage Thermodynamics and Kinetics Performances of La–Mg–Ni Ternary Alloys

The effects of Ni content and ball milling time on the hydrogen storage thermodynamics and kinetics performances of asmilled La_5Mg_(95–x)Ni_x(x = 5,10,15) ternary alloys have been investigated.The evolution of microstructure and phase of experimental alloys in the absorption/desorption process has been characterized by XRD,SEM and HRTEM.The hydrogen storage kinetics and thermodynamics performances and PCI curves have been tested using the Sievert apparatus.It is found that the rising of Ni content remarkably improves the hydrogen storage kinetic performance,but reduces hydrogen storage capacity.And with the increase in milling time,hydrogen desorption activation (E_a) value decreases firstly and then increases;the minimum value is 47.6 kJ/mol,and the corresponding milling time is 10 h for La_5Mg_(85)Ni_(10) alloy.As for the thermodynamics properties,the hydrogenation enthalpy (ΔH) and hydrogenation entropy (ΔS) both decrease firstly and then increase with the rising of Ni content and milling time.The composite La_5Mg_(85)Ni_(10) alloy milled for 10 h exhibits the best thermodynamics and kinetics performances,the lowest E_a of 47.6 kJ/mol,absorption of 5.4 wt.% within 5 min and desorption of 5.2 wt.% within 3 min at 360 °C and the lowest ΔH and ΔS of 72.1 kJ/mol and 123.2 J/mol/K.
Availability modeling for periodically inspection system with different lifetime and repair-time distribution

Availability is a main feature of design and operation of all engineering system. Recently, availability evaluation of periodical inspection systems with different structures is at the center of attention due to the wide application in engineering. In this paper, an analytical and probabilistic availability model for periodical inspection system is proposed by a new recursively algorithm, which can achieve limiting average availability and instantaneous availability of periodical inspection system under arbitrary lifetime and repair-time distributions. Then three application examples are presented, the systems lifetime and repair-time are respectively fellow exponential/exponential, Weibull/normal and Weibull/lognormal distribution. Finally, a Weibull/lognormal system is studied to analyze the dynamic relationship between inspection period and availability. The results indicate that the proposed approach can provide the technology support for improving system availability and determining reasonable inspection period.
Flight dynamics characteristics of canard rotor/wing aircraft in helicopter flight mode

The aerodynamic layout of the Canard Rotor/Wing (CRW) aircraft in helicopter flight mode differs significantly from that of conventional helicopters. In order to study the flight dynamics characteristics of CRW aircraft in helicopter mode, first, the aerodynamic model of the main rotor system is established based on the blade element theory and wind tunnel test results. The aerodynamic forces and moments of the canard wing, horizontal tail, vertical tail and fuselage are obtained via theoretical analysis and empirical formula. The flight dynamics model of the CRW aircraft in helicopter mode is developed and validated by flight test data. Next, a method of model trimming using an optimization algorithm is proposed. The flight dynamics characteristics of the CRW are investigated by the method of linearized small perturbations via Simulink. The trim results are consistent with the conventional helicopter characteristics, and the results show that with increasing forward flight speed, the canard wing and horizontal tail can provide considerable lift, which reflects the unique characteristics of the CRW aircraft. Finally, mode analysis is implemented for the linearized CRW in helicopter mode. The results demonstrate that the stability of majority modes increases with increasing flight speed. However, one mode that diverges monotonously, and the reason is that the CRW helicopter mode has a large vertical tail compared to the conventional helicopter. The results of the dynamic analysis provide optimization guidance and reference for the overall design of the CRW aircraft in helicopter mode, and the model developed can be used for control system design.
A numerical study on flame and large-scale flow structures in bluff-body stabilized flames

Large Eddy Simulations (LES) in conjunction with the Flamelet Progress Variable (FPV) approach have been performed to investigate the flame and large-scale flow structures in the bluff-body stabilized non-premixed flames, HM1 and HM3. The validity of the numerical methods is first verified by comparing the predicted velocity and composition fields with experimental measurements. Then the evolution of the flame and large-scale flow structures is analyzed when the flames approach blow-off. The analysis of instantaneous and statistical data indicates that there exists a shift of the control mechanism in the recirculation zone in the two flames. In the recirculation zone, HM1 flame is mainly controlled by the mixing effect and ignition mainly occurs in the outer shear layer. In HM3 flame, both the chemical reactions and mixing are important in the recirculation zone. The Proper Orthogonal Decomposition (POD) results show that the fluctuations in the outer shear layer are more intense in HM1, while the flow structures are more obvious in the outer vortex structure in HM3, due to the different control mechanism in the recirculation zone. It further shows that the flow structures in HM1 spread larger in the intense mixing zone due to higher temperature and less extinction.
Switched adaptive active disturbance rejection control of variable structure near space vehicles based on adaptive dynamic programming

Based on the switched nonlinear system, a switched adaptive Active Disturbance Rejection Control (ADRC) law is proposed for the Variable Structure Near Space Vehicle (VSNSV) with unknown uncertainties and external disturbances. The reduced-order Extended State Observers (ESOs) are constructed for the attitude angle system and the angular rate system to estimate the total disturbance in real time. With the extended state introduced to counteract the effects of uncertainties and disturbances, a systematic procedure is presented for the synthesis of the switched adaptive ADRC strategy. Rigorous proof shows that the estimation errors of the reduced-order ESOs would converge to a small neighborhood of zero in finite time, and that the output of the closedloop system can track a given signal stably for a class of switching signals with average dwell time via the proposed approach. The variable gain control strategy based on Adaptive Dynamic Programming (ADP) with the actor-critic structure is also designed to improve the dynamic performance of the system. Simulation results verify the effectiveness and advantage of the proposed control scheme.
Weak Seismic Signal Extraction Based on the Curvelet Transform

Seismic signal denoising is a key step in seismic data processing. Airgun signals are easy to be interfered with by noise when it travels a long distance due to the weak energy of active source signal of the airgun. Aiming to solve this problem,and considering that the conventional Curvelet transform threshold processing method does not use the seismic spectrum information,we independently process the Curvelet scale layer corresponding to valid data based on the characteristics of the Curvelet transform of multi-scale,multidirection and capable of expressing the sparse seismic signals in order to fully excavate the information features. Combined with the Curvelet adaptive threshold denoising the algorithm,we apply the Curvelet transform to denoising seismic signals while retaining the weak information in the signal as much as possible. The simulation experiments show that the improved threshold denoising method based on Curvelet transform is superior to the frequency domain filtering,wavelet denoising and traditional Curvelet denoising method in detailed information extraction and signal denoising of low SNR signals. The calculation accuracy of the relative wave velocity variation of underground medium is improved.
豇豆根腐病病原菌鉴定

豇豆营养价值较高,且在改善土壤肥力等方面具有重要作用。近年来,由于环境恶劣、栽培管理不当、抗病品种缺乏等原因,使得豇豆根腐病发生严重,现已成为制约豇豆生产的重要土传病害。目前,国内外已报道可引起豇豆根腐病的镰孢菌有11种,如茄病镰孢Fusarium solani、尖孢镰孢F. oxysporum 、轮枝镰孢F. verticillioides等(https://nt.ars-grin. gov/fungaldatabases/),但是对茄病镰孢种下专化型尚未见报道。明确病原菌是防治病害的关键,本研究拟通过形态学特征观察、寄主专化型测定和分子生物学鉴定,明确引起山东省豇豆根腐病的病原菌类型,以期为其防治和抗病育种提供理论依据。