礼物流动模式的反向——评《礼物的流动》

《礼物的流动》的作者通过生动的社会生活交往,分析了黑龙江下岬村礼物交换原则、模式及其所反映出来的社会关系网络运行方式,发现单向送礼会导致受礼者权力和声望增加,这与以往绝大多数人类学家研究结果正好相反,可谓是礼物流动模式的反向。这对中国人类学研究具有非常重要的意义,填补了中国的礼物与乡村人际关系研究的空白。     

Assessing China's Cybersecurity Law

In November 2016, China passed its first Cybersecurity Law, aiming to strengthen cyberspace governance through a number of initiatives, including Internet operator security protection, personal information protection, special protection of critical information infrastructure, local storage of data, and security evaluation for data export. This Article discusses the major concepts and principles of the Cybersecurity Law. It also discusses the tensions and controversies inherent in the law. All in all, the Cybersecurity Law exhibits distinctive Chinese characteristics. It is premised on the concept of cyberspace sovereignty and emphasizes security over free flow of data and freedom of speech. It provides a basic legal framework for cyberspace governance in China, to be supplemented by implementing regulations in years to come.     

浅谈路由基础结构免遭拒绝服务

当网络遭受拒绝服务时，信息包不能达到目的地，已有的邮件路由协议不能很好地解决拒绝服务问题。作者在文中提出了路由基础结构拒绝服务的模型，并描述了用入侵检测保护路由基础结构免遭拒绝服务的方法。     

平交路口左转交通流的组织与管理

如何合理组织与控制路口的左转弯交通流,是平交路口交通秩序管理及提高路口通行能力的核心问题。可以通过连续向右绕行,远引交叉等措施实现左转。同时这种路口禁止左转弯的交通管制要与路网布局匹配,尽可能不给车辆的行驶造成太大的不便。在条件允许的地方,仍需通过合理渠化设置左转专用车道和相位。     

"智慧景区"背景下交通组织管理方式探究

"智慧景区"已经成为我国旅游业发展的新趋势,利用大数据可对景区运行状态进行整体把控,系统性地诊断景区管理问题成因,及时监测和发现景区问题区域,提出景区游览管理措施和方案。就景区外部而言,利用大数据可分析游客在景区外部游览路线趋势。在此基础上,组织者可通过对周边道路采取交通管控措施,实现对游客进出景区的合理诱导,缓解景区进出口通道的交通拥堵。就景区内部而言,利用大数据可分析各景点人流聚集与移动情况。同时,组织者可采取"容量限制"和"流向调控"等有效管理措施,实现对人流游览路径的调控,对游客进行科学的疏导和分流,提升景区管理服务水平。     

Groundwater irrigation management in the Kingdom of Saudi Arabia： A case study of Al-Wajid aquifer

Groundwater is the primary source for water irrigation in the Kingdom of Saudi Arabia. As a result of lack of basic knowledge on irrigation practices, massive abstractions of groundwater occurred in 1980s. A decision support linear programming （LP） model was developed to help in allocation of optimal groundwater irrigation use, to assess policies implication for water management efficiency, and to estimate welfare impact on producer surplus is developed. Due to massive abstractions occurring in 1980s, Al-Wajid aquifer water levels have dropped in agricultural areas by more than 200 m. The total groundwater of Al-Wajid aquifer that can be saved is equal to 158.7 MCM for the first scenario, 211.9 MCM for the second scenario, and 15,087 MCM for the third scenario. Regarding welfare analysis impact, it is clear that the second scenario alternative is the best alternative, since the value of the producer surplus is the highest for the two study regions and also the two type schemes of modern and traditional irrigation, except the traditional irrigation of Najran region.     

大陆仍然是台商对外投资的首选之地

台湾岛内有的媒体认为台商在大陆投资被边缘化了。这是不符合事实的。本文以大量的实际资料说明,台商在大陆投资始终为大陆所欢迎和重视。因而其投资趋势不但未缩小,还在扩大,技术也在升级。这是符合资本流动规律的,也是一种不可逆转的趋势。     

不同光照条件下褪黑素对鸡鸭鹌鹑外周血淋巴细胞及其亚群变化的影响

为探讨不同褪黑素水平对禽类机体免疫系统的调节作用,通过控制不同光照条件,分3组(短光照组、长光照组和对照组)饲养鸡45只、鸭45只、鹌鹑45只,采用荧光双色染色法和流式细胞仪分别检测鸡、鸭、鹌鹑外周血中CD3 、CD4 、CD8 T淋巴细胞及其亚群和Bu-1a B淋巴细胞数量变化。结果,短光照组由于体内褪黑素水平较高,外周血中CD3 CD4 T细胞、CD3 CD8 T细胞、Bu-1a B细胞及白细胞总数都有不同程度升高,且与对照组相比差异显著;长光照组由于体内褪黑素分泌较少,外周血中CD3 CD4 T细胞、CD3 CD8 T细胞、Bu-1a B细胞及白细胞总数都有不同程度降低,且与对照组相比差异显著。结果表明,内源性褪黑素对鸡、鸭、鹌鹑外周血中淋巴细胞及其亚群的数量变化有显著影响。     

浅论青年人才的职业流动

随着市场经济的发展 ,青年人才的流动日益频繁 ,并呈现出以下发展趋势 :青年人才向高科技产业流动 ;青年人才向经济发达地区和发达国家流动 ;青年人才向外资和私营企业流动。充分研究青年人才流动的原因及当前存在的问题 ,并加强对流动的正确引导 ,使青年人才流动向着更合理、更科学的方面发展     

Nitrate and Nitrite Determination in Gunshot Residue Samples by Capillary Electrophoresis in Acidic Run Buffer,

Simultaneous determination of nitrate and nitrite in gunshot residue has been conducted by capillary electrophoresis using an acidic run buffer (pH 3.5). In previously developed capillary electrophoretic methods, alkaline pH separation buffers were used where nitrite and nitrate possess similar electrophoretic mobility. In this study, the electroosmotic flow has been reversed by using low pH running buffer without any additives. As a result of reversing the electroosmotic flow, very fast analysis has been actualized, well‐defined and separated ion peaks emerge in less than 4 min. Besides, the limit of detection was improved by employing large volume sample stacking. Limit of detection values were 6.7 and 4.3 μM for nitrate and nitrite, respectively. In traditional procedure, mechanical agitation is employed for extraction, while in this work the extraction efficiency of ultrasound mixing for 30 min was found sufficient. The proposed method was successfully applied to authentic gunshot residue samples.