江西省汛期降水的变化特征

为全面分析江西的汛期降水量的变化趋势,本文利用小波分析方法研究了赣北、赣中、赣南降水分布的特征和年代际变化,结果显示,赣北、赣中、赣南汛期降水线性趋势呈下降趋势。江西省汛期降水变化包含了多个不同时间尺度的周期变化和演变特征,目前及今后2～3年内赣北、赣中汛期降水呈偏少的趋势,赣南降水有偏少的趋势。利用mann-kendell方法检验了江西汛期降水的突变,赣南汛期降水的突变点发生在1978年。     

甘肃省能源经济系统分析与优化策略研究

能源经济系统的优化不仅是实现区域节能减排目标的重要途径,更是社会经济可持续发展的主要内容,本文以甘肃省为研究案例,基于计量经济学方法,对其经济增长与能源消耗之间的动态关系进行了定量研究;进而运用结构分解模型,对比分析了影响单位GDP能耗的主要因素。研究结果表明:甘肃省GDP与能耗总量之间存在长期的协整关系;促进甘肃省能源强度降低的主要因素是各产业能源利用效率的提高,而产业结构变动对全省能源强度降低的贡献份额较小;对能源强度降低贡献较大的为第二产业的效率份额与结构份额,而第三产业结构份额对能源强度降低的贡献为负。文章最后从产业结构优化、关键技术推进、能源结构优化三个角度提出了甘肃省能源经济系统的优化策略。     

中国华东及其周边地区NDVI对气温和降水的季节响应

地表植被与大气的相互作用过程是地球科学领域的研究重点和热点。本文基于SPOTVGT-NDVI数据和气象站点的气温和降水资料,采用时滞相关分析法,研究了1998年-2011年我国华东及其周边地区四季NDVI对气温和降水的时空响应特征。结果表明,在整个研究区,气温对NDVI的影响大于降水,NDVI与气温在夏季和秋季相关性较高,与降水在秋季和春季相关性较高,冬季NDVI与气温和降水相关性都最低。NDVI对气温响应的滞后期在春季和秋季较短,对降水响应的滞后期在冬季较短,夏季NDVI对气温和降水响应的滞后期都较长。在冬季、春季和秋季,NDVI对气温和降水最大相关系数的空间分布在研究区的南北部差异不明显,在夏季则具有较明显的南北差异。NDVI对气温变化响应的滞后期在春季、夏季和秋季具有较明显的南北差异,对降水变化响应的滞后期除在夏季具有一定的南北差异外,在其他季节空间分布规律性不显著。     

Effect of oral ingestion of different forms of silver on tissue content of some essential elements in chicks

Silver is ingested in India in the form of varak, Ayurvedic bhasm and water contained in silver utensils, but nobody knows their effects. We have examined the effect of interaction of silver ingested in the form of varak (leaf), bhasm (ash) and water (colloidal solution) on some essential elements (Na, K, Ca, Mg, Cu, Fe and Zn) in blood, liver, spleen and kidneys of chicks. The results showed significant rise of silver in all the tissues and significant fall in copper in the blood. The greatest rise was obtained in blood silver by silver sol while it had the lowest amount of silver. Iron significantly increased in tissues but somewhat decreased in blood. Zinc content increased in all the tissues by leaf and ash but decreased by sol. No consistent pattern was seen in case of other elements.     

Unintended consequences on gender diversity of high-tech growth and labor market polarization

There has been considerable media coverage highlighting the lack of gender diversity in Silicon Valley, stressing the relatively low participation of women in the high-tech economy. Austin offers a unique case for testing whether similar gender issues characterized other high-tech regions because the city has historically benefited from the expansion of Silicon Valley’s large high-tech firms since the 1980s. The gender-biased business practices identified in Silicon Valley firms may have been transferred to their branch plants in Austin. Our analysis shows women’s losses in middle-skill occupation employment shares were concentrated in the low-tech industry and were partially offset by job share gains in high-skill occupations in the same sector between 1980 and 2015. Men’s losses in middle-skill occupation job share were also mainly concentrated in the low-tech sector but were partially offset by employment share gains in high-skill occupations only in the high-tech industry during this period. Women made large gains in relative real median wages only in high-skill occupations in the high-tech industry while their relative real median wages in other skill occupations and in the low-tech industry stagnated around zero during this period. Men’s gains in relative median wages were also concentrated only in the high-tech industry but were less than half of women’s and were negative (between ?10 and ?21 percent) in other occupations in the high-tech industry and across all occupations in the low-tech industry. As noted in previous studies, the impact of job polarization is not well understood across sectors and gender. This study finds the high-tech industry in Austin has had unintended consequences in terms of job polarization across gender, providing relatively fewer job opportunities in high-skill occupations to women than men but offering much higher gains in relative real median wages to women than men. Males also found relatively more job opportunities in high-skill occupations in the high-tech industry than women but experienced only half of women’s gains in relative median wages in this industry between 1980 and 2015.     

人工髋关节翻修术25例疗效分析

目的：探讨人工髋关节置换术后翻修的原因、骨缺损的处理、假体的选择及相关翻修技术。方法：选择广西中医药大学附属瑞康医院2003年1月-2013年12月行人工髋关节翻修术的25例病例的临床资料,其翻修假体的类型：全生物型臼和柄12例,全骨水泥型臼和柄3例,只用骨水泥臼4例,只用骨水泥柄2例,混合型假体2例,用原假体2例。需要植骨8例。结果：疗效参考Harris评分：优19髋（90分以上）、良4髋（80-89分）、可2髋（70-79分）,优良率为92%。翻修的原因：假体松动9例,假体沉陷4例,假体脱位4例,感染2例,假体松动并周围骨折2例,假体周围骨折2例,假体松动并脱位1例,假体断裂1例。结论：找出初次置换失败的原因,针对性的制定翻修方案,合理的选择翻修假体,具备一定的翻修技术及经验是髋关节翻修术获得成功最基本的条件。     

完善我国企业并购的税收监管分析

针对企业并购的税收监管问题进行了研究.论文分析了我国企业并购税收监管的现状,在借鉴西方企业并购监管经验的基础上,探讨了我国实现并购税收监管的思路和建议.研究对于促进并购业务的长远发展具有现实意义.     

具有安全机制的电子商务应用系统框架的研究

本文首先介绍电子商务发展中的相关技术,详细分析了电子商务过程中存在的Internet网络和商务活动安全问题。接着给出了一个在电子交易过程中实现电子商务安全的应用系统框架。最后提出了电子商务安全技术发展不足的几个方面,以及发展我国电子商务应该采取的措施。     

利用累积湿润指数分析江淮地区农业旱涝时空变化

提出了一个农业旱涝气象指标一一累积湿润指数。该指标以相对湿润度指数为基础,通过确定不同区域综合农田作物系数对参考作物蒸散量进行订正,并考虑前期旱涝程度对当前旱涝状况的累积影响,从而具有农业意义。用土壤墒情指标对该指标进行分区域旬旱涝等级的确定和检验,其定量符合率为60％-70％,定性符合率为80％．90％。利用该指标分析近30年江淮地区农业旱涝时空变化的结果表明,从多年平均意义上江淮地区农田水分状况能满足作物需求,湿润程度湿润区高于半湿润区。农业旱涝年际变化大,变异率北部大于南部。北部旱涝并存,春旱、夏秋和秋冬连旱频率高,夏季洪涝严重;南部总体湿润,以涝居多,但夏秋干旱频发。在气候变化导致江淮地区降水格局发生变化的条件下,近年来北部夏季洪涝,南部夏秋旱问题突出,值得关注。     

高含沙河流汛期弃水量确定的分级最大值法

针对中国北方干旱半干旱缺水地区高含沙河流汛期洪水资源难于控制利用及评价的问题,以径流特征及水资源开发利用均具有典型性的泾河为例,根据河流径流特征和水资源利用特点,利用流域1933年-2001年汛期6月-10月的径流量、径流泥沙含量和引水量资料,基于它们之间的内在联系,把基本资料序列从小到大进行排列并划分成若干等级,通过对各等级的统计获得上三角形形式的洪水弃水系数与其影响要素之间的等级关系,提出汛期洪水弃水系数计算的分级最大值法,可快速准确地确定出不同沙限下的汛期洪水弃水量,通过与传统方法的比较,结果表明本研究提出的分级最大值法计算所得结果更为合理有效,为流域洪水资源的开发利用及评价提供一种行之有效的方法。     

技术进步偏向与要素配置对我国林业全要素生产率的影响

技术进步是促进林业全要素生产率增长的重要动力,聚焦林业技术进步偏向、要素配置与全要素生产率之间关系,为充分发挥林业技术进步的带动力提供量化支持,助力我国林业经济高质量发展。采用2005－2021年我国31个省（自治区、直辖市）面板数据,分别构建全样本及四大区域的超越对数生产函数进行实证分析。结果发现：技术进步偏向、要素配置状态是我国林业全要素生产率增长的重要引擎;林业全要素生产率增长存在地区差异,各区域全要素生产率增长率均有所下降,但下降程度不同;技术进步偏向并不总是促进林业全要素生产率增长,四大区域的林业技术进步在多数年份偏向于资本与林地;部分地区的林业全要素投入与要素效率状态未完全相适应,要素配置有待改善;技术进步、技术效率变化存在区域差异。在此基础上,从促进区域间交流合作、调整生产技术进步方向、改善要素配置、提高科技创新能力等方面提出促进我国林业全要素生产率增长的建议。     

Information Economy and Changing Occupational Structure in Singapore

Using population census data since 1921, this article traces changes in employment and occupational structure in Singapore in the past 80 years. This is a follow-up to an earlier paper by Kuo and Chen (1987) that reported the nascent formation of the information society in Singapore till the 1980s. It also makes an assessment of the role of proactive government policies in directing industrial restructuring and occupational changes in this city-state. It is found that the long-term growing trend in information-related occupations has been in tandem and supportive of industrial changes in Singapore. One more wave of growth of information producers (and certainly, innovators) and information distributors is expected in the next couple of decades. The momentum has started, and competition from regional countries similarly aspiring to be information and knowledge economies will quicken the pace. The government has initiated fundamental changes in the educational system to meet the challenges of the knowledge-based economy. The small city-state has also long adopted an adaptive philosophy to be responsive to the ever-changing environment, either in technology or in regional politics. Based on the trend analysis, it is expected that the emergent information society will graduate into full status when Singapore attains a developed country status in the forthcoming decades.     

Changes in the levels of glycoproteins and glycosaminoglycans in diabetes associated with myocardial infarction

Changes in the levels of glycoprotein (GP) and glycosminoglycans (GAG) were studied in diabetes associated with myocardial infarction in rats. Diabetes was induced by alloxan while myocardial infarction was induced using isoproterenol. Most of the GAG fraction increased in the heart and aorta in diabetes superimposed with myocardial infarction. The carbohydrate of GP also increased in heart while in serum only sialic acid showed an increase. The activity of lysosomal enzymes showed an increase in the case of β-glucuronidase and β-hexosaminidase while in the case of β-galactosidase and β-fucosidase it showed a decrease in the heart.     

虚拟企业盟主动态管理过程中信息活动和信息流分析

本文研究虚拟企业中盟主的动态管理过程中的信息活动．运用Mowshowitz过程原理构建了虚拟企业盟主动态管理过程模型，详尽分析了盟主动态管理中的信息活动的特征和过程模型各阶段内的信息流．     

中国房屋建筑中钢铁存量的时空变化

建筑业是中国最大的钢铁消费领域,动态分析建筑中的钢铁存量的变化特征,有助于把握其二次资源回收潜力,为铁资源的循环利用及相关管理提供科学支撑。本研究以动态物质流分析结合生命周期分布函数,测算了1949—2016年中国房屋建筑中的钢铁存量。结果显示：经过缓慢增长期、稳定增长期和快速增长期三个阶段后,中国房屋建筑中钢铁存量从1949年的10.0万t增长到2016年的28.1亿t,房屋建筑中人均钢铁存量也从0.2kg/人增加到2029kg/人;受工业化和城镇化进程影响,中国四大经济区域房屋建筑中人均钢铁存量差别明显,2016年东部地区房屋建筑中人均钢铁存量最大为2526kg/人,其次是东北地区2128kg/人、中部地区1732kg/人和西部地区1605kg/人;受城镇和农村的生活环境、经济水平差异影响,中国城乡房屋建筑中人均钢铁存量差异显著,2016年中国房屋建筑中城镇人均钢铁存量达3145kg/人,农村为530kg/人。     

Demand drops and innovation investments: Evidence from the Great Recession in Spain

The Great Recession, which began in 2008, brought about large contractions in aggregate consumption in many countries. In this research, we study the impact of heterogeneous decreases in demand on innovation investments by analyzing the evolution of innovation investments in a panel of Spanish manufacturing firms during the 2004–2013 period. We proxy heterogeneous variation in demand with net exit rates in the productive stratum of each firm, defined as the group of firms in the same industry and size class. These net exit rates are computed considering all firms in the stratum, including firms that are determined to be non-innovative firms. To support the identification strategy, we show that exit rates do not capture idiosyncratic unobservable characteristics among innovative firms. In addition, we control for the effect of time-varying credit constraints. We find that a one standard deviation increase in exit rates is associated with reductions of 1.5% in the share of firms investing in innovation. The drop is larger for smaller firms, which also experience greater decreases in sales. Since smaller firms are most sensitive to demand drops, they are the natural candidates to be the target of policies devoted to increasing R&D activities during crises. As additional analysis, we study firms’ perceptions of the main obstacles to innovation to find that net exit rates capture the heterogeneous variation in demand, rather than credit constraints. Finally, when analyzing the exit patterns of firms in the sample, we confirm that the net exit rate in a firm's stratum does not drive the exit of firms in our sample.     

艺术高校数字馆藏服务绩效影响因素分析

随着馆藏数字资源的迅速增长,数字馆藏服务绩效评估研究日益受到重视,相关理论研究也取得一定进展,但实践应用研究却相对不足,特别是艺术高校的数字馆藏服务绩效评估的相关研究。北京服装学院作为全国惟一以服装命名、具有鲜明办学特色的高等学校,图书馆拥有丰富的艺术馆藏。本文对该馆及其他艺术高校图书馆进行广泛调研的基础上,通过本体探讨及差异性分析解析数字馆藏服务绩效的影响因素,以期为艺术高校数字馆藏建设提供参考和依据。     

新疆塔里木河水资源开发利用与生态保育对策

该文分析了塔里木河近50年来水资源开发利用过程中出现的生态与环境问题。研究表明,塔里木河上游三源流灌区用水量的增加是导致塔里木河干流区来水量不断减少的主要原因,而塔里木河干流下游来水量的大幅度减少,则因塔里木河干流上中游耗水量增加引起。塔里木河下游来水量的锐减,造成下游河道断流321km,尾闾湖泊干涸,地下水位下降,天然植被全面衰败,沙漠化过程加剧。为此,要坚持生态与经济、上游与下游协同发展的原则,实现流域水资源的统一管理,打破水资源发生和利用过程中的多元主体边界; 加快实施塔里木河流域的“供水、堵水和输水”工程;控制源流引水,减少干流上、中游低效耗水,确保下游基本用水,实现流域水过程的完整性和水资源的可持续利用。     

基于可持续度的连云港市土地利用总体规划实施评价

土地利用总体规划实施评价对于落实规划、强化实施具有重要意义。本文在土地可持续利用研究成果的基础上,通过构建基于可持续度的土地利用总体规划实施评价体系,对连云港市土地利用总体规划实施的可持续度进行了评价。结果表明：①采用可持续度量的方法,可以较好的对土地利用总体规划的实施效果进行定量评价;②上一轮规划实施至今,连云港市土地利用总体规划实施的可持续度呈上升趋势,处于中度可持续状态,但环境指标和社会指标方面,规划实施仍不可持续。在此基础上,提出了新一轮规划着眼解决的3个难题：“生存与发展问题”、“刚性与弹性问题”、“静态与动态问题”,以及完善规划的若干措施和建议,为新一轮规划修编提供有利借鉴。     

省属高校经济管理专业人才大众化教育模式研究

针对黑龙江省老工业基地改造需要经济管理专业人才的情况,基于市场供求均衡理论,提出大众化时期省属高校经济管理人才素质培养模式的观点.经过对黑龙江省企业构成及其改革发展对人才需求动态研究,明确了省属高校经济管理专业人才培养质量要求,建立起省属高校经济管理专业人才培养模式。