Depositional architecture of the late Ordovician drowned carbonate platform margin and its responses to sea-level fluctuation in the northern slope of the Tazhong region, Tarim Basin

The Tazhong Uplift of the late Ordovician is a drowned rimmed carbonate platform. The carbonate rock of the late Ordovician Lianglitage Formation in the northern slope of the Tazhong region is one of the significant petroliferous intervals. Based on petrofacies, depositional cycles, natural gammaray spectrometry and carbon/oxygen isotope data from the Lianglitage Formation, one 2nd-order, three 3rd-order and several 4th-order sequences have been recognized, and the late Ordovician relative sealevel fluctuation curve has been established. The sequences O3 1-1 and O3 1-2 on the platform are composed of highstand and transgressive systems tracts, but lack the lowstand systems tract. The sequence O3 1-3 is a drowning sequence. The sequence O3 1-1 overlapped the eroded slope and pinched out to the northwest and landward. The highstand systems tract in the sequence O3 1-2 consists of low-angle sigmoid and high-angle shingled progradation configuration. Major sedimentary facies of the Lianglitage Formation include reef and shoal in the platform margin and lagoon, which can be subdivided into coral-sponge-stromatoporoid reef complex, sand shoal, lime mud mound, and intershoal sea. Reefs, sand shoals and their complex are potential reservoir facies. The reefs and sand shoals in the sequence O3 1-1 developed in the upper of its highstand systems tract. In the sequence O3 1-2, the highstand systems tract with an internal prograding configuration is a response to the lateral shifting of the complex of reef and sand shoal. The transgressive systems tract, in particular the sand shoals, developed widely on the slope of the platform margin and interior. The reefs in the sequence O3 1-3 migrated towards high positions and formed retrograding reefs in the western platform and low relief in the platform interior. Basinward lateral migration of the reefs and pure carbonate rock both characterize highstand systems tract and show that the rise of the relative sea-level was very slow. Shingled prograding stacking pattern of the 4th-order sequences and reefs grow horizontally, which represents the late stage of highstand systems tract and implies relative sealevel stillstand. Reefs migrating towards high land and impure carbonate rock both indicate transgressive systems tract and suggest that the relative sea-level rose fast. Erosional truncation and epidiagenetic karstification represent a falling relative sea-level. The relative sea-level fluctuation and antecedent palaeotopography control the development and distribution of reef complexes and unconformity karst zones. Currently, the composite zone of epidiagenetic karstic intervals and high-energy complexes of reefs and sand shoals with prograding configuration is an important oil and gas reservoir in the northern slope of the Tazhong carbonate platform.

Symmetry properties of fluctuations in an actively driven rotor

We investigate rotational dynamics of an actively driven rotor through experiments and numerical simulations. While probability density distributions of rotor angular velocity are strongly non-Gaussian, relative probabilities of observing rotation in opposite directions are shown to be linearly related to the angular velocity magnitude. We construct a stochastic model to describe transitions between different states from rotor angular velocity data and use the stochastic model to show that symmetry properties in probability density distributions are related to the detailed fluctuation relation(FR) of entropy productions.

Online dynamic measurement of saturation-capillary pressure relation in sandy medium under water level fluctuation

An online dynamic method based on electrical conductivity probe, tensiometer and datataker was presented to measure saturation-capillary pressure （S-p） relation in water-light nonaqueous phase liquid （LNAPL） two-phase sandy medium under water level fluctuation. Three-electrode electrical conductivity probe （ECP） was used to measure water saturation. Hydrophobic tensiometer was obtained by spraying waterproof material to the ceramic cup of commercially available hydrophilic tensiometer. A couple of hydrophilic tensiometer and hydrophobic tensiometer were used to measure pore water pressure and pore LNAPL pressure of the sandy medium, respectively. All the signals from ECP and tensiometer were collected by a data taker connected with a computer. The results show that this method can finish the measurement of S-R relation of a complete drainage or imbibition process in less than 60 min. It is much more timesaving compared with 10-40 d of traditional methods. Two cycles of water level fluctuation were produced, and four saturation-capillary pressure relations including two stable residual LNAPL saturations of the sandy medium were obtained during in 350 h. The results show that this method has a good durable performance and feasibility in the porous medium with complicated multiphase flow. Although further studies are needed on the signal stability and accuracy drift of the ECP, this online dynamic method can be used successfully in the rapid characterization of a LNAPL migration in porous media.

Multi-fractal Behaviors of Relative Humidity over China

The multi-fractal ity over China are studied behaviors of relative humid using the multi-fractal de trended fluctuation analysis （DFA） method. Three multi fractal parameters （the spectrum width Aa, the asymmetry Aaas, and the long-range correlation exponent a0） of the singularity spectrum are introduced to quantify the multi-fractal behaviors. The results show that multi-frac tality exists in daily humidity records over most stations in China and is mainly due to the broad distribution of the probability density of the sequence values. Strong multi fractal behaviors over some stations in the Yunnan, Guangdong, and Inner Mongolia provinces are obvious. These behaviors are mainly caused by different long range correlations between large and small fluctuations. The asymmetry of the singularity of relative humidity records is weak, except for a small number of stations in the far east and west of China, where the singularity spec trum is left-skewed. Finally, the long-range correlations in North China are stronger than those in South China, which indicates better predictability in North China. By studying the parameters of the multi-fractal spectrum, various data of long-range power law correlations of the relative humidity records are obtained, which may pro vide theoretical support for climate prediction.

胰岛素注射相关皮下脂肪增生对糖尿病患者短期血糖波动的影响

目的探讨胰岛素注射相关皮下脂肪增生对糖尿病患者短期血糖波动的影响。方法选择2022年5月至2023年3月于我院进行胰岛素注射治疗且行动态血糖监测的30例胰岛素注射相关皮下脂肪增生1型糖尿病患者作为1型增生组,另选择同期同类治疗的30例无胰岛素注射相关皮下脂肪增生的1型糖尿病患者作为1型非增生组。选择同期我院胰岛素注射治疗且行动态血糖监测的30例胰岛素注射相关皮下脂肪增生2型糖尿病患者作为2型增生组,另选择同期同类治疗的30例无胰岛素注射相关皮下脂肪增生的2型糖尿病患者作为2型非增生组。统计患者血糖波动相关指标情况。结果1型增生组LAGE、MADE、MODD水平显著高于1型非增生组(P<0.05)。两组SD、CV、LI、CONGAn1h、CCONGAn4h比较,差异无统计学意义(P>0.05)。1型增生组短期血糖波动发生率水平(53.33%,16/30)显著高于1型非增生组(10.00%,3/30)(P<0.05)。2型增生组血糖波动相关指标与2型非增生组比较(P<0.05)。2型增生组短期血糖波动发生率水平(73.33%,22/30)显著高于2型非增生组(13.33%,4/30)(P<0.001)。结论胰岛素注射相关皮下脂肪增生对1型和2型糖尿病患者均对血糖指标有影响,可增加短期血糖波动风险,对于血糖控制较为不利,需积极防控该类脂肪增生发生发展。

乳腺癌术前化疗过程中脑静息态功能活动与类淋巴功能改变及相关性分析

目的探究女性乳腺癌患者术前新辅助化疗后脑静息态功能和类淋巴功能变化及其之间的相关性。方法40名健康女性被试及80名女性乳腺癌患者被纳入本次研究,乳腺癌患者均进行术前新辅助化疗。应用MMSE、DSST和FACT-CogPCI评分评估被试认知功能。应用rsfMRI获取反映大脑功能活动的ALFF指标。应用DTI-ALPS技术获取反映脑类淋巴功能的ALPS指数。分析乳腺癌患者化疗前后ALFF及ALPS变化,分析各指标与认知评分之间的相关性,并分析ALFF与ALPS之间的相关性情况。结果乳腺癌患者化疗后MMSE、DSST及FACT-CogPCI评分均减低(P<0.05)。化疗后,左侧颞极中部、左侧丘脑腹外侧核及右侧顶后中回团块ALFF值减低,双侧颞叶、枕叶及顶叶多个脑区的ALFF值与FACTCogPCI评分呈正相关(pFDR-C<0.001)。化疗后ALPS指数相比正常被试增高(1.42±0.29 vs 1.56±0.24,P=0.011),同时ALPS指数与FACT-CogPCI评分呈正相关(r=0.241,P=0.04)。与此同时化疗后左侧舌状回ALFF值与ALPS指数呈正相关(r=0.69,P<0.001)。结论研究结果提示,大脑功能活动和类淋巴引流均参与化疗后认知功能改变的过程,同时两者存在相关性。

Effective temperature and fluctuation-dissipation theorem in athermal granular systems:A review

The definition and the previous measurements of a dynamics-relevant temperature-like quantity in granular media are reviewed for slow and fast particle systems. Especially, the validity of the fluctuation-dissipation theorem in such an athermal system is explored. Experimental evidences for the fluctuation-dissipation theorem relevant effect temperature support the athermal statistical mechanics, which has been widely explored in recent years by physicists. Difficulties encountered in defining temperature or establishing thermodynamics or statistical mechanics in non-equilibrium situations are discussed.

Carbon and strontium isotope variations and responses to sea-level fluctuations in the Ordovician of the Tarim Basin

In the Ordovician, a carbonate platform system grading from the platformal interior eastwards to basin was developed in the Tazhong area of the Tarim Basin, and the study column is located in the place where the paleoslope occurred. The isotope compositions of the carbonates there are thus considered as having reflected those of simultaneous sea waters in view of its good connection with the open seas. The carbon and strontium isotope compositions of the Ordovician carbonates in the Tazhong area are analyzed, and their relationships to the sea-level fluctuations are discussed as well. Studies have revealed that the carbon isotope composition is related positively with the sea-level fluctuations, whereas an opposing situation occurs to the strontium isotope variation. Similar responses of carbon and strontium isotope compositions to the sea-level fluctuations are reported elsewhere in the world, suggesting that the Ordovician sea-level fluctuations of the Tarim Basin were of eustatic implication.

Relative sea-level rising and its control strategy in coastal regions of China in the 21st century

The Chinese coastal regions are the high risk areas of natural disasters for their lowland and weak and sensitive eco-evironment. The relative sea-level rising (RSLR), resulting from the piling of global sea-level rising and regional land subsidence, is to speed up in the 21st century. Certainly the RSLR will exacerbate the land submerging, the disaster from storm-tide and flood-waterlogging and the water shortage, and then affect urban withstanding function, construction safety and eco-resources. According to sustainable development theory, the sustainable utilization of resources and environment and sustainable development of economy and society can both be effectively achieved in coastal regions of China in the 21st century only by the implementation of controlling discharge of greenhouse gas, optimal exploitation of and artificial recharge of ground-water, systematic control of land subsidence, higher design standards for tide and flood controlengineering, improving urban anti-disaster ability, a study on strategy and policy for RSLR and establishment of forecast and pre-warning institution.

Board independence and fluctuations of corporate performance--A research from the angle of social relations of independent directors

Based on whether there is social relation between independent directors and CEOs,there are two types of independence in the board of directors:nominal independence and real independence.Their influences on the fluctuations of corporate performance are varied.First,the board independence will strengthen supervision and reduce the fluctuations in corporate performance.Second,the nominal board independence will reduce performance fluctuations but with inadequate significance;however,the real independence significantly reduces fluctuations of corporate performance;social relations between CEO and independent directors will encourage fluctuations of corporate performance.This also confirms that the independent directors can reduce the corporate performance instead of just holding the post and doing nothing.At the same time,in order to improve the real board independence,when recruiting independent directors,those gray directors who have social relations with CEO must be identified and excluded.

静脉溶栓治疗的急性脑梗死患者早期症状反复波动的相关因素分析

目的探讨静脉溶栓的急性脑梗死患者溶栓24 h内症状反复波动的相关因素。方法收集在发病4.5 h内接受重组组织型纤溶酶原激活剂(rt-PA)静脉溶栓的急性脑梗死患者101例,分为波动组与无波动组。收集两组患者的临床资料,并进行比较。结果波动组与无波动组患者的年龄、性别、溶栓前血压、溶栓前INR、发病-溶栓时间、低密度脂蛋白胆固醇(LDL-C)水平及高血压病、糖尿病史/糖化血红蛋白(HbA1c)>6%、吸烟史、TOAST分型、溶栓后24 h内颅内出血的比率差异均无统计学意义(均P>0.05)。波动组溶栓前NIHSS>3分及前循环梗死的比率显著高于无波动组(均P<0.05)。多因素Logistic回归分析显示,NIHSS>3分(OR=2.953,95%CI:1.044~8.354,P=0.041)和梗死部位(OR=4.020,95%CI:1.067~15.140,P=0.040)是症状波动的独立相关因素。结论静脉溶栓24 h内的症状反复波动与卒中严重程度及梗死部位相关。

中国产业结构分布与经济波动

本文在阿西莫格鲁(Acemoglu)关于产业结构分布与经济波动关系研究的基础上,引入劳动力占比,实证分析了中国产业结构分布与经济波动之间的关系。基于中国投入产出表的数据,设定多种产业规模指标反映中国不同产业的关联度差异,既验证中国产业结构的不对称性,也探讨了产业层面潜在的波动形成源。通过Nadaraya-watson非参数估计回归,发现产业规模不对称时,产业部门的波动确实会导致宏观经济波动。由于高阶关联关系的存在,波动会有一定的持续性,对宏观经济的影响较大,产业波动可以解释9%的宏观波动原因。

河北省粮食产量波动及其形成的影响因素定量化分析

利用波动方程对粮食产量及气候和粮食生产物质资料投入要素波动性进行分离,对粮食生产投入产出和气候因子进行时间序列波动变化特征分析,运用灰色关联分析方法结合两两比较判断矩阵,探求粮食产量波动形成的主控因子。结果表明,河北省粮食产出波动具有阶段性变化特征,整体趋势与农业政策制度变化具有明显相关性;物质资料投入因素年际间波动高于气候因素波动;粮食播种面积、有效灌溉面积、化肥施用量、降水量波动以及政策制度变化是产量波动的主要影响因素。

明渠交汇区水位变化特性试验研究

基于物理模型试验,探讨了天然河流交汇区水位变化特性,分析不同干支流来水条件下水位沿程变化、交汇区典型断面水位流量关系、交汇区泥沙起动流速变化等特性。结果表明,交汇区水位变化的强弱与干支流流量等密切相关,交汇区泥沙起动流速沿程变化与单一河道有明显差异。

周期性盐度波动对凡纳滨对虾游离氨基酸含量及渗透调节相关基因表达的影响

在实验室条件下,以盐度30为对照组(S0),4 d为1个盐度波动周期,研究了幅度为4(S4)和10(S10)的周期性盐度波动对凡纳滨对虾(Litopenaeus vannamei)稚虾离子通道和水通道相关基因表达、游离氨基酸(FAA)含量及其FAA代谢相关基因表达的影响。结果发现:(1)在盐度波动条件下,凡纳滨对虾离子通道相关基因Na^+/K^+-ATPaseα(NKAα)、Na^+/K^+-ATPaseβ(NKAβ)、碳酸酐酶(CA)、V型H^+-ATPase 1(VHA 1)表达量随盐度波动幅度的增加而极显著升高(P<0.01);S4组对虾Na^+/H^+交换因子(NHE)和F型H^+-ATPase 1(FHA 1)表达量显著高于S0和S10组(P<0.05);而Cl-通道蛋白(CLC)表达量在各组间差异不显著(P>0.05);(2)周期性盐度波动极显著影响凡纳滨对虾水通道蛋白(AQP 4)的基因表达(P<0.01),其表达量随盐度波动幅度的升高而下降;(3)周期性盐度波动对凡纳滨对虾肌肉中FAA总量无显著影响(P>0.05);鳃中FAA总量随盐度波动幅度的增加而显著升高(P<0.05),各组甘氨酸、精氨酸、脯氨酸等含量存在显著差异(P<0.05)。(4)与S0组相比,S10组对虾的丙氨酸转氨酶(ALT)表达量极显著升高,S4和S10组对虾的氨基转移酶(AMT)、脯氨酸脱氢酶(PDH)基因表达量极显著降低(P<0.01)。实验结果初步表明,周期性盐度波动条件下,凡纳滨对虾渗透调控在转录水平上产生积极响应,且随着盐度波动幅度的增大,对虾的渗透适应性调控水平升高。在盐度波动幅度达到10时,凡纳滨对虾仍能维持体内的渗透平衡,说明其具有较强的耐受盐度波动的能力。

重症颅脑损伤病人血糖波动对炎症指标和继发性肺炎的影响

目的探讨重症颅脑损伤病人血糖波动对体内炎症指标及继发性肺炎的影响及意义。方法选择2015年10月至2017年12月广西壮族自治区人民医院首次诊断发病≤24 h的重症颅脑损伤病人47例,采用动态血糖监测系统(CGMs)对病人进行72 h的血糖监测,记录血糖波动指标包括初始血糖值(GluAdm)、血糖平均值(GluMean)、最低血糖值(GluMin)、最高血糖值(GluMax)、血糖标准差(GluSD)、最大血糖波动幅度(LAGE)、平均血糖波动幅度(MAGE)和血糖不稳定指数(GLI);同时检测血清白细胞介素-6(IL-6)、C-反应蛋白(CRP)及降钙素原(PCT)水平,并采用高分辨率胸部CT明确病人肺炎情况,根据是否存在肺部感染分为感染组和非感染组。采用Spearman法分析血糖波动指标与病人临床资料的相关性,采用logistic回归法分析病人出现肺炎的影响因素。结果感染组与非感染组入院时性别、年龄、全身性感染相关性器官功能衰竭评分(SOFA)评分、激素使用例数比较均差异无统计学意义(均P>0.05)。非感染组病人GluMean、GluSD、LAGE、GLI、MAGE水平明显低于感染组[(9.69±0.86)比(10.54±0.86)mmol/L,(1.92±0.77)比(2.52±0.55)mmol/L,(8.10±1.60)比(11.12±1.83)mmol/L,(33.34±9.20)比(54.28±6.25)mmol/L,(3.66±0.75)比(5.16±0.95)mmol/L],血清RP、IL-6、PCT水平明显高于非感染组[(15.17±0.96)比(17.82±0.96)mg/L,(25.81±1.53)比(27.62±1.80)ng/L,(0.69±0.10)比(2.17±0.11)ng/mL,均P<0.05]。logistic回归分析结果显示LAGE、MAGE是预测出现肺炎的危险因素(P<0.05)。结论血糖波动是重度颅脑损伤后全身炎性因子释放重要影响因素,LAGE、MAGE与继发性肺炎密切相关。

豆粕价格与生猪价格波动关系的实证研究

文章从实证的角度,运用协整检验、格兰杰检验和脉冲响应函数等方法,深入分析了我国豆粕价格与生猪价格的相互关系。发现豆粕价格和生猪价格存在双向的因果关系,二者具有长期均衡关系,豆粕价格每波动1%,生猪价格将同向波动0.325 4%,从短期来看,豆粕价格对生猪价格的影响和生猪价格对豆粕价格的影响均存在一定的时滞,但豆粕价格对猪价的影响大于猪价对豆粕价格的影响。基于上述结论,提出了相应的政策建议。

变动回水影响下的水位流量过程对应关系分析

闸坝变动回水影响的河道,其水位流量过程对应关系非常复杂,与来水量大小、闸门启闭、蓄泄量有关,因而存在着反峰、错峰、多峰对应等关系。以水量平衡原理为基础,分析推导了定量关系式,讨论了不同条件下的水位流量变化过程。结果表明,受闸坝变动回水影响的河段,不仅要增加测流次数,还要了解来水情况及闸门启闭条件。该分析结果可作为闸坝变动回水影响河段的流量测验、整编、分析及合理性检查等参考借鉴。

轴向运动纱线束的非线性横向振动特性

为控制纱线张力波动,提高毯面质量,研究了地毯织造过程中黏弹性纱线束振动模型及其影响因素。应用三参数本构关系表征纱线束黏弹性,结合轴向几何非线性变形和材料非线性因素,用牛顿第二定律建立纱线束横向振动方程。经无量纲化和一阶Galerkin截断,应用四阶Runge-Kutta法求解常微分方程,可得纱线束喂入速度、张力波动幅度以及阻尼系数对振动特性的影响。结果显示,当纱线束材料确定后,降低纱线束振动振幅从而减少张力波动的方法主要是增加阻尼系数,如增加提花罗拉表面摩擦因数。

流通业发展与城镇化——基于面板数据模型的实证研究

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