Experimental Study on Vortex-Induced Vibration of Marine Riser Model with Coupling Interference Effect Under Combined Internal and External Flow

A partition model of interference efficiency was constructed to study the coupling interference effect under combined internal and external flow.The concept of“internal flow efficiency”,“velocity ratio”and“interference efficiency”were introduced to quantify the effect of internal flow and interference,and reveal the coupling mechanism among internal flow,external flow and interference effect.The results showed that the dynamic response of risers under variable angles was significantly different after considering the effect of internal flow.When the external flow velocity was smaller than 0.25 m/s,the vibration of risers was promoted by the internal flow.With the increase of external flow velocity,the effect of internal flow was weakened and the dynamic response of riser mainly depended on the external flow and interference effect.Under the effect of different internal flow,the interference efficiency had similar change trend.The interference effect amplified the complex secondary flow effect inside the riser,making the dynamic response of riser complex and random.In this paper,the overlap area and subdivision criterion of interference effect were constructed within the range of experimental velocity ratio,and the change curve of interference efficiency was obtained with an average meaning,which may have important practical meaning.

A method for identifying coalbed methane co-production interference based on production characteristic curves: A case study of the Zhijin block, western Guizhou, China

Efficient detection of coalbed methane(CBM) co-production interference is the key to timely adjusting the development plan and improving the co-production efficiency. Based on production data of six typical CBM co-production wells in the Zhijin block of western Guizhou Province, China, the production characteristic curves, including production indication curve, curve of daily water production per unit drawdown of producing fluid level with time, and curve of water production per unit differential pressure with time have been analyzed to explore the response characteristics of co-production interference on the production characteristic curves. Based on the unit water inflow data of pumping test in coal measures, the critical value of in-situ water production of the CBM wells is 2 m^(3)/(d·m). The form and the slope of the initial linear section of the production indication curves have clear responses to the interference, which can be used to discriminate internal water source from external water source based on the critical slope value of 200 m^(3)/MPa in the initial linear section of the production indication curve. The time variation curves of water production per unit differential pressure can be divided into two morphological types: up-concave curve and down-concave curve. The former is represented by producing internal water with average daily gas production greater than 800 m^(3)/d, and the latter produces external water with average daily gas production smaller than 400 m^(3)/d. The method and critical indexes for recognition of CBM co-production interference based on the production characteristic curve are constructed. A template for discriminating interference of CBM co-production was constructed combined with the gas production efficiency analysis, which can provide reference for optimizing co-production engineering design and exploring economic and efficient co-production mode.

History of the PRC’s Participation in International Human Rights Affairs and Its Contribution to the Cause of International Human Rights

The history of the participation of People’s republic of china in international human rights affairs can be mainly divided into two phases since its founding 70 years ago,and it can be further divided into four stages with typical events after the launch of reform and opening-up.Since the adoption and implementation of the reform and opening-up policy in the late 1970 s china has witnessed the active participation and fruitful achievements of china in bilateral and multilateral human rights cooperation and communication,as well as making important contributions to the international human rights cause.

Work in Cooperation for A New Chapter in the Cause of International Human Rights——Speech by Yang Jiechi,Vice Minister of Foreign Affairs of the People's Republic of China at the Inaugural Session of the United Nations Human Rights Council

Mr Chairman, I would like to start by congratulating you, on behalf of the Chinese Govern- ment, on your assumption of the Chair of the inaugural session of the Human Rights Council. I have every confidence that under your able leadership this session will be successful.

Interference of internal involute bevoloid gears with parallel axes

The involute bevoloid gears has been more and more widely used in Practical industry, but the researchahout its interference has never been reported. In order to satisfy the design need of intemal involute bevoloid geare,two importan interference conditions are discussed in deail and verification formulae are given as appropriate. There-fore, this paper has an instructive meaning to the design of intemal boloid geare.

The Evolution of US-Cuba Relations in the Trump Era

Since 2017, US president Donald Trump has adopted a series of tough policies aimed at overturning Obama' s legacy of diplomacy toward Cuba. In order to ensure the stability of the political transition and economic development, the Cuban government has adopted a urational and prudent” struggle strategy vis-a-vis the United States, and this has meant that relations have not completely broken down. However, stagnation in the normalization process ofUS-Cuba relations has produced some negative effects, and these have led not only to an impact on the Cuban economy, but also to adverse effects on the United States in many areas. Nevertheless, US-Cuba relations in the Trump era will remain at rock bottom, and Cuba will continue to face significant pressure for survival.

Enhance the Influence of China-UK “One Belt and One Road” Cooperation

The Belt and Road Initiative is a new concept of opening-up put forward by Chinese leader Xi Jinping after he took office.It is the most influential international initiative since China’s reform and opening up.Its implementation has achieved remarkable results in the past few years,with more than expected results.More and more countries in the world have supported and responded to the Belt and Road Initiative.China and the UK are countries with important influence in the world.The Belt and Road Initiative has great potential and far-reaching impact between two countries.This paper analyzes the theory of influence of the Belt and Road and discusses the practical problems existing in the China-UK Belt and Road Cooperation.By applying the research method of matching theory with reality,the author puts forward some measures to enhance the influence of the Belt and Road Cooperation between the two countries.It is of great academic and practical significance to study the Belt and Road Theory and the international relations between China and Britain.

Effect of internal pressure on strength of hydraulically expanded joints

To analyze the effect of internal pressure on the connection strength of hydraulically expanded joints,a hydraulic expanding and push-out process of a joint of tube to sleeve was simulated by using FEM and validated by experiments at various internal pressure values.The stress and residual stress in the joined pair during the joining process illustrates that the contact pressure on the interface is not uniform along the longitudinal direction.The research reveals that if the sleeve does not experience any plastic deformation,the connection strength increases with the internal pressure linearly.For sleeve material with yield point elongation,if the sleeve experiences some degree of plastic deformation,there is an internal pressure interval in which the connection strength decreases slightly as internal pressure increases.Therefore,the internal pressure should be controlled depending on the deformation of the sleeve,but not as high as possible.The simulated results are in good agreement with those from experiments.

Optical feedback characteristics in a helium neon laser with a birefringent internal cavity

The output characteristics of optical feedback in a helium neon laser with a birefringent internal cavity are studied systematically in five different regions of the gain curve for the two orthogonally polarized modes. When the laser operates in the two end regions of the laser gain curve, one of the two orthogonally polarized modes will be a leading one in optical feedback. Strong mode competition can be observed. However, when the laser operates in the middle region of the laser gain curve, the two modes can oscillate equally with optical feedback. Besides the intensity of the two polarized lights, the total light intensity is also studied at the same time. M-shaped optical feedback curves are found. Particularly, when the average intensities of the two lights are comparable, the intensity modulation curve of the total light is doubled, which can be used to improve the resolution of an optical feedback system.

Development from Right to Interfere to Responsibility to Protect

Right to interfere applies to circumstances where human rights abuses occur. It did function well in early years, however, as time goes by, some defects emerge and introducing a new theory to protect humarL rights conditions is necessary. Responsibility to protect evolves from right to interfere and overcomes the deficiencies inherent in its predecessor. But responsibility to protect is not a perfect system, and to improve it, some measures such as establishing a performance evaluation mechanism should be adopted.

Many Countries Say Xinjiang Riot China’s Internal Affair

Many countries around the world said the July 5 riot in northwest China is an internal affair of the country, and the Chinese government is handling the incident properly.

Accurately Comprehending the Concept of"Rule of Law in Foreign- Related Affairs" to Promote Coordinated Advancement in the Rule of Law in Chinese Domestic and Foreign-Related Affairs

The n notion of"rule of law in foreign-related affairs"signifies a critical innovation and evolution in the theory and practice of socialist rule of law with Chinese characteristics.It underscores the pivotal role of rule of law in foreign-related affairs in the law-based governance and presents new topics for the theoretical study for rule of law.A precise comprehension of"rule of law in foreign-related affairs"necessitates tracing its origins and elucidating its correlations with both"rule of law in domestic affairs"as well as with"international rule of law."Acknowledging both domestic and international plerugatives,while holistically advancing law-based governance,constitutes the foundational rationale behind"rule of law in foreign-related affairs."In addition,the cognitive transition from a"socialist legal system"to the"socialist rule of law"in foreign-related affairs."In addition,the cognitive transition from a"socialist legal system"to the"socialist rule of law"forms a theoretical foundation for the rule of law in foreign-related affairs.Although national governance and global governance,as well as the rule of law in domestic and foreign-related affairs fall under distinct governance categories and legal systems,they are interconnected,mutually influential,and integrated.As a component of national rule of law,the rule of law in foreign related affairs acts as a bridge between the two independent legal systems of the rule of law in national affairs and international rule of law.It is imperative to promote a harmonized advancement of the rule of law in domestic and foreign-related affairs,thereby expediting the strategic deployment of the rule of law in foreign contexts.This strategy more effectively safeguards national sovereignty,security,and developmental interests while contributing to build a human community with|a shared future.

The Rule of Law in Foreign-Related Affairs in Building China into a Great Modern Country

The call to advance the rule of law in foreign-related affairs is an important component of China's strategic move to a great modern country.In modern times,Western countries have applied rule of law practices in their modernization,demonstrating the values of a sound rule of law system for national strength.In particular,the rule of law,extended beyond national borders,provides a crucial guarantee for a great modern country's sustained,stable,and healthy path,and is also a clear symbol of a country's soft power.As China is progressing to become a great modern country,there is a need to pay a particularly close attention to the rule of law,actively promoting the legalization of foreign-related work.China's stance on the rule of law in foreign-related affairs should include both a principle of defending its core interests and a principle of advocating shared values and of promoting mutually beneficial cooperation.In the context of this era,China's international law professional community should delve into appropriate models that can facilitate smooth progress on the path to modernization,further enhancing the rule of law in China and the successful emergence of a great modern country.

内埋武器机弹分离动态风洞投放试验研究

基于动力学相似的动态风洞投放试验研究了尖拱圆柱体从空腔中分离的气动及运动特性,并创新性地采用快响应压敏漆技术对动态运动模型表面上的压力分布测量进行初步探索研究,试验中探究了不同空腔模型攻角(α=0°,-1.5°,-3°)及弹体在空腔内的不同位置(L_(0)=25 mm,39 mm)对内埋武器机弹分离特性的影响。结果表明:弹体在空腔内的位置对机弹分离运动特性的影响最大,当L_(0)=25 mm时,弹体模型头部区域压力明显高于后部区域压力,产生抬头俯仰力矩,导致弹体模型俯仰角逐渐增大,最终碰撞空腔模型,降低载机攻角并未改变弹体模型碰撞空腔模型的效果。当L_(0)=39 mm时,弹体模型在给定的攻角下均能安全地从空腔中分离。

近代变局与庆宽的仕宦人生

庆宽是晚清民初的“奇人”,以民籍混入内务府旗籍,借助绘画的特长和办皇差的机会,在晚清拥堵的官场上,逐级升迁至候选内务府三院卿,积累了大量财富,也引发了官场侧目,遭到光绪帝下旨抄家的惩罚。戊戌之后,庆宽利用往日的关系网成为访日特使,又因为辛丑议约的劳绩,获得保举,恢复了原有旗籍和职衔。晚清最后十年,庆宽在仕途上做最后一搏,但最终止步于四品道台,遂决心离开官场。在民初的十年,庆宽以平民视角观察政局,时而以旗人身份筹划旗人生计,时而作为普通市民关注城市自治,逐渐淡出了时代舞台。

新时代侨务政策的国际比较与经验启示

侨务工作作为党和国家的一项长期性、战略性工作,是推动国家经济社会发展的重要力量。文章基于百年未有之大变局的背景,分析了近年来国家侨务工作面临的复杂多变的国际竞争环境、全球化人才流动格局变化和海外侨情变化等新挑战新要求。比较了各国侨民战略与侨务政策的阶段转变和特色差异。新时代我国侨民战略与侨务政策体系仍面临不少挑战,必须积极借鉴国外在构建侨民战略框架、完善涉侨法律体系、推行引资引智计划、创新侨民工作格局等方面的经验,从建立中国特色侨民战略体系、加强海外人才风险预防、整合优化涉外资源、构建“大侨务”工作格局、积极开展民间外交、加强实地调研等方面优化侨民战略与侨务政策体系。

从清宫内务府汉文奏销档看织染局种种

文章基于中国第一历史档案馆藏内务府汉文奏销档中关于织染局的七份档案,通过梳理乾隆和嘉庆年间内织染局设置及所辖人、财、物变更等重要事项,分析了清朝中期织染局的沿革历史、人员构成和分工、所用物料、织造品类和使用去向等种种问题,阐明了织染局作为清代官营织造机构之一的特殊性质和使命,以及与江南三织造的联系和区别。织染局作为清代唯一一处位于京内的官营织造机构,其用丝主要来自江南三织造的供应,在匠役的来源上也与江南地区有着密切联系。由于地理条件及生产规模所限,织染局所产丝织原料质量、生产规模和产品类别均不能与三织造相比。但是作为随传随办的织造机构,织染局能够灵活应变,满足上用和内用的临时需求,因此在清代官营织造机构中具有特殊地位。而且,自乾隆十七年(公元1752年)织染局迁入万寿山演化为耕织图后,不仅通过精简人员和技艺优化来扩大生产品类和提高产品质量,更与皇帝倡导农桑的政策紧密结合,逐渐形成兼具实际生产意义和政策示范性的场所,同时也满足了皇帝对江南田园生活的向往,成为承载官营生产织造和皇帝人文思想的理想机构。

论涉外法治关系的法理结构及实践意义

本文从一个全新的法理视角来阐释从党的十八届四中全会《中共中央关于全面推进依法治国若干重大问题的决定》(以下简称《决定》)提出的“加强涉外法律工作”到党的十九届四中全会《中共中央关于坚持和完善中国特色社会主义制度推进国家治理体系和治理能力现代化若干重大问题的决定》(以下简称《决定》)确定的“加强涉外法治工作”政策术语演变背后的法理依据,并对作为习近平法治思想核心要义之一的“坚持统筹国内法治和涉外法治”的法理内涵进行了创新意义上的解读,其基本分析方法就是打破了传统法理学使用的法律关系概念的逻辑界限,用法理内涵和外延更加丰富的法治关系的概念来分析“统筹”国内法治和涉外法治关系中的各种法律问题,主张应当把制定法规则与法律秩序效果有机结合起来综合性地判断一个主权国家的法治状态,不能仅仅将研究视野停留在制定法规则占优势的传统法理上。本文在分析法治关系概念的建构功能时指出,在涉外法治关系体系中,法治关系的构成要素至少应当分为九个方面,包括法律规则要素、法律关系主体要素、法律关系客体要素、法律关系内容要素(主要是权利义务关系)、法律关系时空要素、法律关系手段要素、法律关系目的要素、法律关系效力要素和法律关系秩序要素。上述九个方面的法治关系构成要素只要其中一个类型的要素中包含“涉外”因素,那么,这种法治关系就具有了“涉外法治关系”的特性,就必须从整体上来协调法律关系中的法律规则与法律秩序之间的价值要求,统筹基于传统法律关系理论形成的“国内法治”与根据法治关系理论产生的“涉外法治”,以具有实效性的“法治”价值来保证涉外法律工作的制度化、规范化,不断提高涉外工作法治化水平。

基于低相干干涉的孔类零件内表面测量系统研究

对孔类零件的内表面进行测量是判断其加工质量和使用寿命的重要手段。针对精密孔类零件内表面测量的需求,提出一种基于低相干干涉的内表面测量及信号处理方法,并搭建了完整的检测系统。对低相干干涉的测量原理进行了分析;搭建了以迈克尔逊干涉仪为主体,主要包含光源、探测器、数据采集仪、参考臂、样品臂等部分的检测系统;研究了干涉信号滤波以及包络峰值提取算法;最后,通过实验验证了此系统可以表征孔类零件的内部特征,并且其测量精度可达10μm以内。

动态单模InGaAsP/InP内反射干涉半导体激光器

本文报导了1.3μm InGaAsP/InP内反射干涉型动态单模半导体激光器,器件由质子轰击工艺形成中段耦合干涉腔,最高单模运转调制速率达600 MHz,典型边模抑制比为20∶1。