Case study on the mechanics of NPR anchor cable compensation for large deformation tunnel in soft rock in the Transverse Mountain area,China

A study was conducted to analyze the deformation mechanism of strongly weathered quartz schist in the Daliangshan Tunnel,located in the western Transverse Mountain area.A large deformation problem was experienced during the tunnel construction.To mitigate this problem,a support system was designed incorporating negative Poisson ratio(NPR)anchor cables with negative Poisson ratio effect.Physical model experiments,field experiments,and numerical simulation experiments were conducted to investigate the compensation mechanical behavior of NPR anchor cables.The large deformations of soft rocks in the Daliangshan Tunnel are caused by a high ground stress,a high degree of joint fracture development,and a high degree of surrounding rock fragmentation.A compensation mechanics support system combining long and short NPR anchor cables was suggested to provide sufficient counter-support force(approximately 350 kN)for the surrounding rock inside the tunnel.Comparing the NPR anchor cable support system with the original support system used in the Daliangshan tunnel showed that an NPR anchor cable support system,combining cables of 6.3 m and 10.3 m in length,effectively prevented convergence of surrounding rock deformation,and the integrated settlement convergence value remained below 300 mm.This study provides an effective scientific basis for resolving large deformation problems in deeply buried soft rocks in western transverse mountain areas.

Exploring the Mechanical Properties,Shrinkage and Compensation Mechanism of Cement Stabilized Macadam-Steel Slag from Multiple Perspectives

Steel slag is characterized by high strength,good wear resistance and micro-expansion.This study aims at exploring the potential of steel slag in cement stabilized aggregates,mainly including mechanical properties,shrinkage and compensation mechanisms.For this purpose,the compressive strength and compressive resilient modulus of cement stabilized aggregates with different steel slag contents(CSMS)were initially investigated.Subsequently,the effects of steel slag and cement on dry shrinkage,temperature shrinkage,and total shrinkage were analyzed through a series of shrinkage test designs.Additionally,in combination with X-ray diffraction(XRD)and Scanning electron microscope(SEM),the characteristic peaks and microscopic images of cement,steel slag and cement-steel slag at different hydration ages were analyzed to identify the chemical substances causing the expansion volume of steel slag and reveal the compensation mechanism of CSMS.The results show that the introduction of 20%steel slag improved the mechanical properties of CSMS by 16.7%,reduced dry shrinkage by 21%,increased temperature shrinkage by 5.8%and reduced its total shrinkage by 19.2%.Compared with the hydration reaction of cement alone,the composite hydration reaction of steel slag with cement does not produce new hydrates.Furthermore,it is noteworthy that the volume expansion of the f-CaO hydration reaction in steel slag can compensate for the volume shrinkage of cement-stabilized macadam.This research can provide a solid theoretical basis for the application and promotion of steel slag in cement-stabilized macadam and reduce the possibility of shrinkage cracking.

Microstructure and properties of 35 kg large aluminum alloy flywheel housing components formed by squeeze casting with local pressure compensation

The squeeze casting method with local pressure compensation was proposed to form a flywheel housing component with a weight of 35 kg.The numerical simulation,microstructure observation and phase characterization were performed,and the influence of local pressure compensation on feeding of thick-wall position,microstructure and mechanical properties of the formed components were discussed.Results show that the molten metal keeps a good fluidity and the filling is complete during the filling process.Although the solidification at thick-wall positions of the mounting ports is slow,the local pressure compensation effectively realizes the local forced feeding,significantly eliminating the shrinkage cavity defects.In the microstructure of AlSi9Mg alloy,α-Al primarily consists of fragmented dendrites and rosette grains,while eutectic Si predominantly comprises needles and short rods.The impact of local pressure compensation on strength is relatively minimal,yet its influence on elongation is considerable.Following local pressure compensation,the average elongation at the compensated areas is 9.18%,which represents a 44.90%higher than that before compensation.The average tensile strength is 209.1 MPa,and the average yield strength is 100.6 MPa.The local pressure compensation can significantly reduce or even eliminate the internal defects in the 35 kg large-weight components formed by squeeze casting.

Study on thermal decomposition kinetics of azobenzene-4,4′-dicarboxylic acid by using compensation parameter method and nonlinear fitting evaluation

Recently,azobenzene-4,4'-dicarboxylic acid(ADCA)has been produced gradually for use as an organic synthesis or pharmaceutical intermediate due to its eminent performance.With large quantities put into application in the future,the thermal stability of this substance during storage,transportation,and use will become quite important.Thus,in this work,the thermal decomposition behavior,thermal decomposition kinetics,and thermal hazard of ADCA were investigated.Experiments were conducted by using a SENSYS evo DSC device.A combination of differential iso-conversion method,compensation parameter method,and nonlinear fitting evaluation were also used to analyze thermal kinetics and mechanism of ADCA decomposition.The results show that when conversion rate α increases,the activation energies of ADCA's first and main decomposition peaks fall.The amount of heat released during decomposition varies between 182.46 and 231.16 J·g^(-1).The proposed kinetic equation is based on the Avrami-Erofeev model,which is consistent with the decomposition progress.Applying the Frank-Kamenetskii model,a calculated self-accelerating decomposition temperature of 287.0℃is obtained.

Carbon decorated Li_(3)V_(2)(PO_(4))_(3) for high-rate lithium-ion batteries:Electrochemical performance and charge compensation mechanism

Fast charging and high-power delivering batteries are highly demanded in mobile electronics,electric vehicles and grid energy storage,but there are full of challenges.The star-material Li_(3)V_(2)(PO_(4))_(3) is demonstrated as a promising high-rate cathode material meeting the above requirements.Herein,we report the carbon decorated Li_(3)V_(2)(PO_(4))_(3) (LVP/C) cathode prepared via a facile method,which displays a remarkable high-rate capability and long-term cycling performance.Briefly,the prepared LVP/C delivers a high discharge capacity of 122 mAh g^(-1)(-93% of the theoretical capacity) at a high rate up to 20 C and a superior capacity retention of 87.1% after 1000 cycles.Importantly,by applying a combination of X-ray absorption spectroscopy and full-range mapping of resonant inelastic X-ray scattering,we clearly elucidate the structural and chemical evolutions of LVP upon various potentials and cycle numbers.We show unambiguous spectroscopic evidences that the evolution of the hybridization strength between V and O in LVP/C as a consequence of lithiation/delithiation is highly reversible both in the bulk and on the surface during the discharge-charge processes even over extended cycles,which should be responsible for the remarkable electrochemical performance of LVP/C.Our present study provides not only an effective synthesis strategy but also deeper insights into the surface and bulk electrochemical reaction mechanism of LVP,which should be beneficial for the further design of high-performance LVP electrode materials.

A Position and Orientation Compensation Mechanism for Automatic Docking Device of Launch Rocket

A position and orientation compensation mechanism for the automatic docking device of a launch rocketwas established.The docking process was simulated,and the maximum docking deviation was used for the prototype testing of the compensation mechanism.The compensation mechanism mainly comprises four column pairmotion branch chains with the same structure.When the position of the ground connector panel changes relative to the moving platform,the sliding rods in the four motion branch chains move and rotate to either compress or stretch the connected spring,thereby compensating the position and orientation.First,the dynamic simulation model of the compensation mechanism was established.The docking process was then simulated under the maximum docking deviation.Bench testing of the automatic docking device prototype was carried out.Afterwards,the device was manufactured,and a maximum load test and maximum deviation test were carried out.The results demonstrate that the compensation mechanism meets the design requirements,and the spring stiffness was found as the most important factor in determining the mechanical properties of the system.The proposed compensation mechanism has a number of advantages,including a simple structure,large load bearing capacity,small size,simple installation,and adjustment.

Design Principle of High-precision Flexure Mechanisms Based on Parasitic-motion Compensation

In design of flexure mechanism, diminishing the parasitic-motion is a key point to improve the accuracy. However, most of existing topics concentrate on improving the accuracy of linear-motion flexure mechanisms via compensating the parasitic error, but few research the multi-dimensional flexure mechanisms. A general design principle and method for high-precision flexure mechanisms based on the parasitic-motion compensation is presented, and the proposed method can compensate the parasitic rotation in company with translation, or the parasitic translation in company with rotation, or both. The crucial step for the method is that the parasitic motion of a flexure mechanism is formulated and evaluated in terms of its compliance. The overall compliance matrix of a general flexure mechanism is formulated by using screw theory firstly, then the criteria for the parasitic motions is introduced by analyzing the characteristics of the resultant compliance matrix as well as with aid of the concept of instantaneous rotation center. Subsequently, a compliance-based compensation approach for reducing parasitic-motion is addressed as the most important part. The design principles and procedure are further discussed to help with improving the accuracy of flexure mechanisms, and case studies are provided to illustrate this method. Finally, an analytical verification is provided to demonstrate that the symmetry design philosophy widely used in flexure design can effectively improve accuracy in terms of the proposed method. The proposed compensation method can be well used to diminish the parasitic-motion of multi-dimensional flexure mechanisms.

Public Policy Supply for Successful Practice of the Xin’anjiang River Ecological Compensation Mechanism

The ecological protection of the inter-provincial river basin of Xin’anjiang River takes the ecological compensation mechanism as the starting point and achieves good results.The success of the mechanism is best reflected in its innovation of public policy supply,which is not only a vivid practice of Xi Jinping’s ecological civilization thought in the new era,but also establishes a model for absorption,transformation and export of policy supply.The effective supply of public policies on ecological environment is the realistic choice for the construction of ecological civilization in the new era.

Research on Compensation Mechanism of Land Acquisition in Rural Areas Based on the Practice of Anhui Province

With the continuous development of Chinese economy and rapid progress it has made,land demand for urban construction becomes larger and larger. Rural urbanization has a great relation to common prosperity and plays a key role in realizing the 21 st century great dream of Chinese people of all ethnic groups. Because of the complicated situation of land acquisition and compensation mechanism,we will conduct a systematic analysis on the compensation mechanism of land acquisition in Anhui Province and put forward the compensation methods to perfect the compensation mechanism according to the present compensation mechanism and the existing shortages of land acquisition in Anhui Province.

Core Issues in Design of Tibetan Grassland Ecological Compensation Mechanism

Scientific grassland ecological compensation mechanism is favorable for improving the grassland ecological environment and promote the sustainable development of animal husbandry. Combined with actual situations of Tibet,this paper discussed core issues in the design of grassland ecological compensation mechanism,including compensation purpose,compensation subject,compensation object,compensation standard,and compensation method. It pointed out that the design of mechanism is a complex and systematic project. Each issue is complex and varied. The government at all levels should be cautious and make scientific treatment,and should not apply a single solution for all issues.

Ocean ecological compensation mechanism in Liaoning area from the angle of ecological civilization——based on analysis of Dalian's cooperative governance

How to speed up the establishment of marine ecological compensation and the ecological compensation system is inevitable choice from ocean country to marine power.Therefore,construction of marine ecological compensation mechanism is the effective means which incentives marine ecosystem services supply,improves the quality of marine ecology,and promotes the ocean to the green transformation.Combined with Dalian maritime case study in Liaoning Province,three dimensional interactive marine ecological compensation mechanism,the compensation frame work,path and operation mechanism were built up.Suggestions on accelerating the legislation process;perfecting the management system;establishing proper system for both incentive constraint and reward-punishment;increasing the source of Ocean Ecological Compensation funds;accelerating On the study of the Ocean Ecological Compensation Mechanism in Liaoning Area from the Angl-e of Ecological Civilization Based on Case Analysis of Dalian.

Initial Exploration on the Ecological Compensation Mechanism of Baiyangdian Watershed

Establishment of the ecological compensation mechanism is one important way for solving a series of issues in Baiyangdian Watershed, including environment pollution, ecological deterioration, unsustained water supplement, rural pollution aggravation and ecological migration. Based on the principles of main functional area, public goods, welfare economics, financial transfer payment and watershed management, we put forward the construction framework of ecological compensation mechanism in Baiyangdian Watershed. Compensation subject is governments at all levels and beneficiary within watershed. Compensation object is governments at all levels, eco-builder and victim within watershed. Compensation way in- dudes government-led and market-oriented and game-negotiation types. Compensation standard includes financial transfer payment, compensation between upstream and downstream of the watershed, rural environmental protection with collections of management fees and subsidies to co-gov- ernance, ecological migration and inter-basin section. The safeguard measures of implementation for ecological compensation mechanism in Baiy- angdian Watershed are setting legal system and status of the ecological compensation, ensuring special usage of the ecological compensation fund, carrying out performance evaluation index system, building social management system of the ecological compensation and promoting the reform of watershed manaQement structure.

Research Electricity Production Costs and External Compensation Mechanism

China's power enterprises are mainly dominated by thermal power, thermal power is the key industry of coal consumption, so the thermal power enterprises have a fundamental influence on the environment, and how to not affect the vital interests of power enterprises under the condition of power plant to increase the strength of governance is to solve the current problem of letter. On the basis of various types of power generation enterprise environmental cost of thermal power, hydropower, wind power and nuclear power pollutant treatment cost were described, through the analysis of emission control scheme and the cost compensation of pollutants, environmental governance cost model, using a actual plant data, calculation of various pollutants compensation cost of thermal power plant, and according to the thermal power and wind power for quantitative comparison before and after compensation.

Perfecting the Market-Oriented Ecological Compensation Mechanism of Ethnic Minority Areas: A Case Study of Gannan Tibetan Autonomous Prefecture

The construction of the market-oriented ecological compensation mechanism in China is complicated system engineering. China's ecological compensation funds are mainly derived from the public finance, lacking market-oriented operation. That not only increases the financial burden of the government, but also leads to the incomprehensive compensation scope. Moreover, China's ecological compensation lacks market mechanism so that it is difficult to set compensation standards and calculate offsets. This paper takes Gannan Tibetan Autonomous Prefecture as an example to analyze the market-oriented ecological compensation system of ethnic minority areas from the perspective of market economy, so as to provide a theoretical basis and a reference point for the establishment of efficient and reasonable ecological compensation mechanism and policies in ethnic minority areas and provide environmental protection for the sustainable development of economy and society of ethnic minority areas.

Compensation：A Synchronic Dynamic Mechanism in Language

In this paper, compensation mechanism—a synchronic dynamic rule in language is postulated and theorized. The rule raises the acceptability of clauses by effecting the positive side of some variations with exceptional expression and offsetting their negative side. This mechanism is determined by the instrumentality and systematicality of language so that its basic principle should be applicable to all exceptional expressions for particular positive effects and thus universal synchronically.

Exploration on Ecological Compensation Mechanism of Family Farm

Family farm is a new type of agricultural operation,and the research on ecological compensation for its production behavior is conducive to consolidating the basic position of agriculture and protecting agricultural resources and environment.By summarizing and drawing lessons from the domestic research results in related fields,the family farm is selected as the object,and the opportunity cost method is used to analyze the setting of the ecological compensation standard of the family farm.The basic framework of ecological compensation mechanism of family farm is constructed from three aspects:ecological compensation responsibility determination mechanism;compensation object establishment mechanism;compensation standard determination and mode selection mechanism.The operation mechanism of ecological compensation of family farm is analyzed from three aspects:farmer;farm production;resources and environment.The results show that the family farms'pursuit of agricultural products and ecological services is the response mechanism of ecological compensation for their production behavior.On the basis of this,this paper puts forward some measures and suggestions to ensure the ecological compensation mechanism of family farms from three aspects:perfecting the land use system;widening the compensation channels;constructing the green GDP accounting.

Compensation mechanism for ecological interests of Erhai Lake tourist destination in Dali, Yunnan province

Erhai Lake in Dali,Yunnan province,is the"Mother Lake"of the Bai people.It has superior location advantages,remarkable comprehensive functions and profound historical culture.It is the cradle of Dali’s politics,economy and culture,and also the foundation of the sustainable economic development of the Autonomous Prefecture.After the government put great efforts to govern Erhai Lake,the original interest demand structure of the surrounding residents was broke down,and the problems of interest friction and interest conflict became the practical problems faced by the region.This paper will analyze the compensation mechanism of Erhai Lake’s ecological interests from the aspects of ecological damage,stakeholders,interests,tourism transformation and so on,so as to provide a reference for the transformation and upgrading of national tourism destinations and tourism industry.

Improving the ecological compensation mechanism for drinking water source in Yunnan province

Ecological compensation mechanism for drinking water source is one of the effective economic ways to solve the issues of the shortage of the protection investment and the lack of the driving forces to protect the water quality.The successful cases of compensation mechanism for drinking water source have examined the dilemma of improving the trans-administrative boundary compensation mechanism both in China and Yunnan.The lack of the provincial rules and regulations in Yunnan is the fundamental reason for the local government not willingly to establish the compensation mechanism.On the other hand,the shortage of the compensation funds is the key difficulty for the shareholders to reach an agreement.Formulating the rules and regulations about the construction of the compensation mechanism of drinking water source in Yunnan would be a feasible way to stipulate the local government to set up the compensation mechanism.Meanwhile,designing a complete set of compensation mechanism would make full use of the mechanism to work well to protect the water quality in an economic way.

Ecological compensation mechanism for Beijing-Tianjin-Hebei region based on footprint balance and footprint deficit

Construction of the ecological compensation mechanism is an important approach to put the“Beijing-Tianjin-Hebei Coordinated Development Plan”into practice and improve the ecological environment of the Beijing-Tianjin-Hebei region.This paper constructs an ecological compensation mechanism for the Beijing-Tianjin-Hebei region based on the footprint balance and footprint deficit after clarifying ecological governance objectives.First,this paper proposes to establish a uniform,hierarchical and classified supply mechanism of ecosystem services according to the classification of land resources,water resources and forest resources for the Beijing-Tianjin-Hebei region.Then,the“Authority with Corresponding Responsibility”for the supply of ecosystem services in the Beijing-Tianjin-Hebei region can be realized through a footprint balance and footprint deficit indicator circulation mechanism.Finally,the scientific and rational ecological compensation standard can be guaranteed through establishing the integrated governance mechanism for ecological compensation in the Beijing-Tianjin-Hebei region and improving the“ecological compensation standard”.The results of this paper can provide sound theoretical support for effectively promoting the improvement of ecosystem services and human well-being in the Beijing-Tianjin-Hebei region.

Subsea Compensation of Pressure Based on Reducer Bellows

In this study,the pressure compensation mechanism of a reducer bellows is analyzed.This device is typically used to reduce the size of undersea instruments and improve related pressure resistance and sealing capabilities.Here,its axial stiffness is studied through a multi-fold approach based on theory,simulations and experiments.The results indicate that the mechanical strength of the reducer bellows,together with the oil volume and temperature are the main factors influencing its performances.In particular,the wall thickness,wave number,middle distance,and wave height are the most influential parameters.For a certain type of reducer bellows,the compensation capacity attains a maximum when the wave number ratio is between 6:6 and 8:4,the wall thickness is 0.3 mm,and the wave height is between 4–5 mm and 5–6 mm.Moreover,the maximum allowable ambient pres-sure of the optimized reducer bellows can reach 62.6 MPa without failure,and the maximum working water depth is 6284 m.