地区出口:集聚、动量和动因

近十年来,我国地区出口发展很不均衡,通过构建集聚指数和动量指数,分析1994～2002年外贸出口的地区特征及变化趋势,并以外商投资企业出口、外商直接投资和实际利用外资作为解释变量,可以比较清楚地分析出地区外贸出口的动因,这为实现外贸均衡发展提供了参考。

澳洲经济背景下的三大货币指数比较研究

本文在模拟澳州经济背景下,通过对迪维西亚指数、费雪理想指数以及动量货币指数的比较分析发现:三者在自身稳定性方面并无特别差异,但从宏观经济预测效果判断,动量货币由于兼得数量和速度双重因子,其总体表现要优于其他两者。这一结论具有重要的理论和现实意义,既为货币交易速度复归提供了有力的理论支撑,也为货币政策中介目标的选择提供了新的参考样本。

下颌前突患者升支矢状劈开术前后咀嚼肌的肌电分析

目的测量下颌前突患者行正颌手术前后的肌电值,分析矢状劈开截骨术(SSRO)后咀嚼肌系统的变化,进一步探讨肌电的改变与术后咀嚼肌适应性改建之间的关系。方法选取18例接受SSRO治疗的下颌前突患者,记录术前及术后3个月、1年时主要咀嚼肌在功能运动中的电生理指标,计算相关参数并进行统计分析。结果下颌前突患者在正常状态下,大部分肌电指标低于健康对照组;行SSRO治疗后3个月,咀嚼肌的肌电指标有所下降,部分指标明显低于术前;术后1年,肌电指标较术前有明显上升,但部分仍低于健康对照组。结论正颌术后,咀嚼肌系统的重建是一个长期的过程,与术前相比较,咀嚼肌的性能得到了一定程度的改善。

Ecological environmental quality evaluation and driving factor analysis of the Lijiang River Basin,based on Google Earth Engine

For regional ecological management,it is important to evaluate the quality of ecosystems and analyze the underlying causes of ecological changes.Using the Google Earth Engine(GEE)platform,the remote sensing ecological index(RSEI)was calculated for the Lijiang River Basin in Guangxi Zhuang Autonomous Region for 1991,2001,2011,and 2021.Spatial autocorrelation analysis was employed to investigate spatiotemporal variations in the ecological environmental quality of the Lijiang River Basin.Furthermore,geographic detectors were used to quantitatively analyze influencing factors and their interaction effects on ecological environmental quality.The results verified that:1)From 1991 to 2021,the ecological environmental quality of the Lijiang River Basin demonstrated significant improvement.The area with good and excellent ecological environmental quality in proportion increased by 19.69%(3406.57 km^(2)),while the area with fair and poor ecological environmental quality in proportion decreased by 10.76%(1860.36 km^(2)).2)Spatially,the ecological environmental quality of the Lijiang River Basin exhibited a pattern of low quality in the central region and high quality in the periphery.Specifically,poor ecological environmental quality characterized the Guilin urban area,Pingle County,and Lingchuan County.3)From 1991 to 2021,a significant positive spatial correlation was observed in ecological environmental quality of the Lijiang River Basin.Areas with high-high agglomeration were predominantly forests and grasslands,indicating good ecological environmental quality,whereas areas with low-low agglomeration were dominated by cultivated land and construction land,indicating poor ecological environmental quality.4)Annual average precipitation and temperature exerted the most significant influence on the ecological environmental quality of the basin,and their interactions with other factors had the great influence.This study aimed to enhance understanding of the evolution of the ecological environment in the Lijiang River Basin of Guangxi Zhuang Autonomous Region and provide scientific guidance for decision-making and management related to ecology in the region.

坚强内固定与颌间结扎治疗偏突颌畸形的电生理研究

目的:研究正颌术后咀嚼肌系统的电生理变化,比较坚强内固定和传统颌间结扎对疗效的影响。方法:选取24例接受正颌手术的偏突颌畸形患者,12例行坚强内固定者作为对照组;12例颌间结扎者作为试验组。记录术前及术后1年主要咀嚼肌的电生理指标,计算相关参数并统计比较。结果:术后1年,两组患者的咀嚼肌不对称指数、活动量指数、功能储备指数均有明显改善,与本组术前比较差异均有统计学意义(P<0.05)。术后1年,试验组患者咀嚼肌不对称指数、活动量指数均明显优于对照组,比较差异均有统计学意义(P<0.05);两组患者咀嚼肌功能储备指数比较差异无统计学意义(P>0.05)。结论:传统颌间结扎和坚强内固定术后咀嚼肌系统均得到了有效的改建,但坚强内固定组患者术后咀嚼肌系统的平衡性及稳定性不如颌间结扎组。

二元q-Szász-Mirakyan算子的逼近性质

该文在Ali.A提出的q-Szász-Mirakyan算子的基础上,提出了二元q-Szász-Mirakyan算子,并研究了它的性质和Cp1,p2空间上的函数在算子作用下的逼近,利用泰勒定理和它的性质,证明了二元q-Szasz-Mirakyan算子的Voronovskaya型定理。

证券市场噪音交易影响因素研究:以房地产业为例

我国证券市场存在着大量的噪音交易,从而导致证券市场股票价格波动较大。为了研究影响噪音交易的相关因素,本文以噪音交易较多的房地产行业为研究对象,通过市场指标和财务指标这两类指标,分别选取了换手率、市盈率等变量,探究其对噪音交易的影响程度。实证结果显示,换手率对噪声交易的影响程度最大。据此我们修正了构造行为市场组合的DVI动量指数,即用换手率代替成交量建立指数。这不仅使得行为贝塔的估算更准确,同时也为行为资产定价模型在我国证券市场上的应用奠定了理论基础。

山东省和广东省社会发展总体情况第三次比较

山东省和广东省社会发展总体情况第三次比较王训礼，王丽，蒋晓云前年和去年，我们曾对山东省和广东省社会发展总体情况进行了两次综合评价和比较，现在又经过一年的发展。两省的社会发展究竟又出现了什么变化呢？现根据中国社科院社会学所《社会指标与社会发展》课题组对...

Shear-thickening rheological response of PCC/PEG suspensions

The steady and dynamic rheological behaviors of precipitated calcium carbonate (PCC) suspension in polyethylene glycol (PEG) were investigated on a TA AR2000ex rheometer. Under steady shear consistency index K and flow exponent N of suspensions with different volume fractions were determined. The shear-thinning and the discontinuous shear-thickening behavior were observed at different constant frequencies from 10 to 100 rad/s. The relationship between the complex viscosity and the constant frequency were determined. As the volume fraction increases,flow exponent N shows a rapid increase,and it increases dramatically when the discontinuous shear-thickening takes place,while consistency index K decreases. Dynamic oscillatory shear experiments were conducted at constant strain amplitude and constant frequency,respectively. For the frequency sweep,the system shows viscous property in entire range of the frequency investigated,and the complex viscosity shows discontinuous jump at a critical frequency of 10 rad/s. For the strain sweep,on the other hand,at low strain the elastic modulus is strongly dependent on the strain,and the viscous modulus is independent of the strain. But at the critical strain point both of the moduli show an abrupt jump and the system transits from elastic to viscous at a strain of 0.1.

噪声交易风险引发的套利限制研究

传统的金融学认为:在证券市场中,投资者的套利行为能有效地消除市场中的错误定价。然而,越来越多的实例证实了证券市场中套利这一行为是有限制的。对套利限制这一问题进行了研究,用实证分析的方法证实了噪声交易风险的长期存在性,最后给出了研究结论,并对监管部门提出了相关的政策建议。

New Convenient Way for Disentangling Exponential Operator Composed of Angular Momentum Operators

In the preceding paper （Commun. Theor. Phys. 51 （2009） 321） we have recommended a convenient method for disentangling exponential operators. In this work we use this method for disentangling exponential operators composed of angular momentum operators. We mainly desentangle the form of exp[2hJz ＋ g J＋ ＋ kJ_] as the ordering exp（... J＋）exp（... Jz）exp（... J_）, we employ the Schwinger Bose realization J_ = bta, J＋ = atb, Jz=（ata - btb）/2 to fulfil this task, without appealing to Lie algebra method. Note that this operator＇s desentanglng is different from its decomposition in normal ordering.

Dynamics of Soil Fauna in Da Hinggan Mountains, Northeast China

The dynamics of soil animals was studied in seven representative forest communities in the north of the Da Hinggan Mountains, Northeast China. The results indicate that it was distinctive in the changes of the numbers of soil animals and groups and diversity in relationship with seasons for macrofauna and meso-micro fauna in the study area. The numbers of the observed soil animals in different months were: October>August>June. Group number was larger in August and October, but smaller in June. The change of diversity index in different months was: August>June>Oc- tober. The biomass for macrofauna in different months was: October>June>August. The composition and number of each functional group was relatively stable. In the community of the predominant soil environment, the percentage of saprophagous animals was higher than carnivorous animals and herbivorous animals. The dynamics changes of sapro- phagous and carnivorous animals were distinctive, increasing from June to October, while the change of herbivorous animals was unremarkable.

Observed dryness and wetness variability in Shanghai during 1873-2005

Dryness and wetness variations on different time scales in Shanghai were analyzed using the Standardized Precipitation Index （SPI） based on monthly precipitation data for 1873-2005. The SPI on scales of 3, 6, 12 and 24 months has been calculated. The SPI on 3, 6, 12 and 24 months present 4 wet periods prevailed during 1873-1885, 1904-1923, 1938-1960 and 1983-2005, and 3 dry episodes during 1886-1903, 1924-1937 and 1961-1982. Significant periods of higher wavelet power in the SPI-24 months occurred on the time scales of 2-7-year band in around 1880-1890, 1910-1950 and 1970-1990, and at 8-15-year band in 1920-1960 and 1965-2000 respectively. Periodicities in the SOl and ENSO indices are similar to those in SPI-24 months with little difference, namely, in the SPI-24 months, there are significant periods at the 2-7- and 8-15-year bands during 1930-1940. The periodicity components in individual SPI-24 months, SOl and ENSO indices are more complicated, showing the wetness and dryness variability in Shanghai is controlled by more than one physical factors. The research results indicate that the Shanghai area has experienced dryness and wetness variability on different time scales during the past 133 years.

Research on single image super-resolution based on very deep super-resolution convolutional neural network

Single image super-resolution(SISR)is a fundamentally challenging problem because a low-resolution(LR)image can correspond to a set of high-resolution(HR)images,while most are not expected.Recently,SISR can be achieved by a deep learning-based method.By constructing a very deep super-resolution convolutional neural network(VDSRCNN),the LR images can be improved to HR images.This study mainly achieves two objectives:image super-resolution(ISR)and deblurring the image from VDSRCNN.Firstly,by analyzing ISR,we modify different training parameters to test the performance of VDSRCNN.Secondly,we add the motion blurred images to the training set to optimize the performance of VDSRCNN.Finally,we use image quality indexes to evaluate the difference between the images from classical methods and VDSRCNN.The results indicate that the VDSRCNN performs better in generating HR images from LR images using the optimized VDSRCNN in a proper method.

我国增强型商品期货指数编制研究

随着我国经济的发展以及金融市场的不断完善,期货市场已成为我国市场经济体系中不可缺少的组成部分。本文编制飞创商品期货价格动量指数,并与中证指数公司的8只基础及增强型期货指数进行了比较。研究发现:增强型商品指数①有益于投资策略的资产分配,在排除流动性风险后,飞创动量商品指数表现最好;通过与其他传统指数对比分析发现,增强型指数收益率的提高并未完全牺牲指数的流动性,且相比于传统商品价格指数更能够分散投资风险。

Effects of three needling manipulations of the right-side Zusanli(ST 36) on brain using functional magnetic resonance imaging

OBJECTIVE: To investigate the effects on the brain using three needling manipulations(twirling, lifting-thrusting, and twirling plus lifting-thrusting)when the right-side Zusanli(ST 36) acupoint was stimulated with needles.METHODS: Seventeen healthy subjects accepted three needling manipulations stimulating the right Zusanli(ST 36) over separate days. Functional magnetic resonance imaging was used to detect changes in the brain during the manipulations, and then the needling sensations were recorded using the MGH acupuncture sensation scale(MASS) after each scan. f MRI data were processed using Statistical Parametric Mapping 8 to analyze the positiveand negative activation in the brain induced by different acupuncture manipulations.RESULTS: The individual needling sensations showed no statistically significant differences among the three manipulations. However, the MASS index showed that lifting-thrusting > twirling plus lifting-thrusting > twirling. Lifting-thrusting activated left premotor cortex, left postcentral,right middle frontal gyrus, left inferior frontal gyrus,right lingual gyrus, left insula, right putamen, bilateral cingulate gyrus and right cerebellum; and deactivated bilateral hippocampus and left caudate.Twirling activated bilateral orbital middle frontal gyrus, left opercular and triangular inferior frontal gyrus, and right middle occipital gyrus; and deactivated bilateral precuneus, right amygdala, left anterior cingulate gyrus, right inferior temporal gyrus,right middle frontal gyrus, right supplementary motor gyrus, and left postcentral. Twirling plus lifting-thrusting activated bilateral postcentral, left inferior occipital gyrus, left insula, left thalamus, left cingulate gyrus, and right putamen; and deactivated right superior frontal gyrus, right superior parietal gyrus, right temporal gyrus, right middle occipital gyrus, right insula, and left lingual gyrus. Pairwise comparisons of the three manipulations showed that signals induced by lifting-thrusting were the strongest, especially in the limbic system,followed by twirling plus lifting-thrusting; twirling alone was the weakest.CONCLUSION: Three methods of needling manipulations similarly activated areas associated with the somatosensory system, vision, cognition, and emotional regulation. This may have significant implications for acupuncture in clinical practice.

Exact solutions to the Klein-Gordon equation in the vicinity of Schwarzschild black holes

We find exact solutions to the Klein-Gordon equation in the vicinity of Schwarzschild black holes.For particles with a zero angular momentum,the convergence range of the solution is r < 4M.One of the solutions describes an exponential enhancement of the density of particles in the vicinity of Schwarzschild black holes,which might be the mechanism of gamma-ray bursts.

Surgical outcomes of subtotal colectomy with antiperistaltic caecorectal anastomosis vs total colectomy with ileorectal anastomosis for intractable slow-transit constipation

Background:Few studies have compared the surgical outcomes of different surgical procedures currently used to treat refractory colonic slow-transit constipation(STC),despite the increase in the number of cases.This study aimed to analyse the long-termsurgical outcomes of subtotal colectomy with antiperistaltic caecorectal anastomosis(SC-ACRA)vs total colectomy with ileorectal anastomosis(TC-IRA)for severe STC.Methods:Between January 2005 and January 2015,we retrospectively collected clinical data of 55 patients who underwent TC-IRA(n=35)or SC-ACRA(n=20)for severe STC at our institution.The post-operative functional outcomes between the two groups were compared.Results:There were no significant differences in age(P=0.655),sex(P=0.234),period of constipation(P=0.105)and defecation frequency(P=0.698)between the TC-IRA and SC-ACRA groups.During a median follow-up period of 72 months(range,12–120 months),there were no significant differences between the TC-IRA and SC-ACRA groups regarding the median number of bowel movements per day[3(1/6–7)vs 3(1/6–5),P=0.578],Cleveland Clinic Florida Constipation Score[2(0–20)vs 2(0–19),P=0.454],Cleveland Clinic Incontinence Score[0(0–5)vs 0(0–2),P=0.333]and Gastrointestinal Quality of Life Index[122(81–132)vs 120(80–132),P=0.661].Moreover,there was no significant difference in the incidence of postoperative complications between the two groups(37.1%vs 25.0%,P=0.285).Conclusions:Our findings indicate that both TC-IRA and SC-ACRA are effective treatments for severe STC,with similar long-termoutcomes.

Temporal Variations in Growth and Aboveground Biomass of Phragmites australis and EVI Analysis in Jiaozhou Bay Coastal Salt Marshes, China

To better ascertain leaf, stem and flower traits, and analyze aboveground allocation during the vegetation period, three sampling vegetation transects were settled and reed samples were collected at intervals to determine morphological parameters and dry and wet weights in Jiaozhou Bay wetland. Remote sensing data were also combined to evaluate regional biomass through EVI regression models. Results show that growth dynamics of leaves and stems changed during the vegetation period. Stem length increased rapidly and peaked in September（194.40 ± 23.89 cm）, whereas leaf width peaked in July. There was a significantly negative correlation between stem length and stem diameter with a value of-0.785. Stem biomass was higher than that of leaves, and the maximum value of aboveground biomass was 27.17 ± 3.56 g. F/C exhibited a tendency to increase and values ranged from 0.37–0.76. The aboveground biomass of sample plots reached a peak of 2356 ± 457 g/m^2 in September. EVI was 0.05–0.5; EVI and biomass had a better fitting effect using the power-exponent model compared with other models and its function was y = 4219.30 x^0.88（R^2 = 0.7810）. R^2 of the other three models ranked as linear function〉 polynomial function 〉exponent function, with the values being 0.7769, 0.7623 and 0.6963, respectively. EVI can be used to estimate vegetation biomass, and effectively solved the problems of the destructive effect to sample plots resulting from traditional harvest methods.

基层法院民事审判工作视角下的法官助理制度构建

我国现有的审判工作人员配置模式不能适应现代法治社会的要求,应当引入西方法治发达国家的法官助理制度。法官助理的职责分工应根据法院工作的专业知识需求指数来确定,法官助理与法官的人数比例应根据法院工作的劳动量消耗指数来确定,同时应根据审判工作与个案案情联系程度的不同,将法官助理区分为事务型助理与助手型助理。