Empirical Study on the Benefit Increase of New Contract Farming 1+3+X Model

For a long time,the development model of traditional rice planting industry has been single,linear,and focusing on production first and then market.However,with the low price of rice,such problems as slow technological upgrading,meager profits,and unstable rice quality in the primary industry planting units and farmers have become increasingly prominent.The integration and development of the rural primary,secondary,and tertiary industries and industrial integration have the same root.They are integrated industrial development based on technological or model innovation,vertical and horizontal integration.Three agricultural leading companies(Nanjing Tianwei Agricultural Technology Co.,Ltd.,Nanjing CHYKINGYOUNG Biological Technology Co.,Ltd.,and Jiangsu Jingshan Eco-organic Agriculture Co.,Ltd.)established an industrialization complex,and used their respective technical,operational,and market advantages to integrate and form a rice contract farming 1+3+X model.This model effectively integrates scattered rice planting,rice processing,and rice sales in Nanjing City of Jiangsu Province,and Chuzhou City of Anhui Province,and unifies planting regulations and supply of production materials,safeguards the supply of green and high-quality rice and realizes high quality and high price.In addition,it integrates farmers into the entire industrial chain of contract farming,summons up the production enthusiasm of farmers and greatly increases their income from planting production.

The Problem analysis of the dairy farming in our country

After the reform and opening up, especially in recent years. Dairy farming has a rapid development in our country, however, the dairy farming link in our country also is in a small scale, and dairy cows yield at lower levels, based on the present situation of dair farming in our country, This article mainly analysis the problems of dairy farming link, and puts torward the corresponding countermeasures and suggestions to solve these problems.

Experimental Evaluation of the Performance of Local Shape Descriptors for the Classification of 3D Data in Precision Farming

Object classification in high-density 3D point clouds with applications in precision farming is a very challenging area due to high intra-class variances and high degrees of occlusions and overlaps due to self-similarities and densely packed plant organs, especially in ripe growing stages. Due to these application specific challenges, this contribution gives an experimental evaluation of the performance of local shape descriptors (namely Point-Feature Histogram (PFH), Fast-Point-Feature Histogram (FPFH), Signature of Histograms of Orientations (SHOT), Rotational Projection Statistics (RoPS) and Spin Images) in the classification of 3D points into different types of plant organs. We achieve very good results on four representative scans of a leave, a grape bunch, a grape branch and a flower of between 94 and 99% accuracy in the case of supervised classification with an SVM and between 88 and 96% accuracy using a k-means clustering approach. Additionally, different distance measures and the influence of the number of cluster centres are examined.

The influencing factors and Development Countermeasures of Large Farming Household in Jiangxi Province

As an important part of the new agricultural business entities, large-scale grain-production households play a significantly positive role in improving the land resource utilization, improving agricultural productivity, increasing agricultural output and farmers＂ income, and making a certain contribution to stabilize grain production. This paper analyzed the current situation of large-scale grain-production household in Jiangxi Province, as well as the problems in land transfer, farmland infrastructure, production and management, capital and other risks. At last, the paper proposed targeted countermeasures.

中高职“3+2”衔接教育及存在的问题、原因与对策

通过对湖北省及全国部分地区中高职“3+2”衔接技能人才分段培养的调研,梳理人才培养过程中存在的问题及主要原因。一是高职阶段学生学习动力不足,学生管理难度大;原因有中职段管理不严,学习无压力,及教学设计存在问题;二是课程设置存在脱节与重叠现象;问题原因是标准未严格执行,并且中高职校缺乏沟通;三是存在衔接口径不匹配现象;原因在于缺乏专业设置标准及监督。针对问题提出了相应的对策建议。一是要建立统一的专业衔接标准、专业教学标准,加强标准执行情况的检查力度;二是要改革“3+2”转段考核的方式,加强中职学生平时成绩的要求与管理;三是加强中高职的沟通与交流;四是延伸中高职衔接为中高本衔接。

Why is the Danger Cylinder Dangerous in the P3P Problem?

The PnP problem is a widely used technique for pose determination in computer vision community,and finding out geometric conditions of multiple solutions is the ultimate and most desirable goal of the multi-solution analysis,which is also a key research issue of the problem.In this paper,we prove that given 3 control points,if the camera's optical center lies on the so-called“danger cylinder”and is enough far from the supporting plane of control points,the corresponding P3P problem must have 3 positive solutions.This result can bring some new insights into a better understanding of the multi-solution problem.For example,it is shown in the literature that the solution of the P3P problem is instable if the optical center lies on this danger cylinder,we think such occurrence of triple-solution is the primary source of this instability.

Key Problems of Cold Power Spinning of Ti-15-3 Alloy

The key problems of cold power spinning of Ti-15-3 alloy are studied. Reasonable billet preparation methods are presented to improve crystal structure and avoid crack of billet. Influences of original wall thickness, reduction rate and feed rate on expanding in diameter are analyzed and some methods to prevent expanding in diameter are given.

Problems of Family Farms in China and Countermeasures

In the Communiqué of the Third Plenary Session of the 18 th Central Committee of the CPC,it proposed the tasks of accelerating the building of a new type of agricultural operation system,endowing farmers with more property rights,promoting equal exchanges of factors of production and balanced allocation of public resources between urban and rural areas,and improving the institutions and mechanisms for promoting the sound development of urbanization. However,as new agricultural operating entities,family farms have problems of land circulation,lack of scientific and technological talents,and backward infrastructure. In line with these problems,this study put forward recommendations and countermeasures,in the hope of promoting increase in farmers' income,increasing agricultural intensification and large-scale level,and realizing agricultural modernization.

随机正则3-可满足性问题的解簇结构分析

正则3-可满足性(3-SAT)问题是一个NP难问题,研究正则3-SAT问题解簇结构变化,旨在深入理解该问题的判定难度和可满足性解的分布情况。然而,现有分析模型只研究了接近簇集相变点的几个离散值,在不同约束密度下,缺乏统一的分析模型来描述解簇的结构演变。为了解决这一问题,提出解簇结构相变分析模型(PMSS)。该模型主要思想是采用WalkSAT算法和信息传播算法求得正则3-SAT问题可满足的初始解,再利用随机游走构造该初始解的解簇,并对解簇进行分析。用模块度和社区度量解簇社区结构,用结构熵度量解簇结构复杂性。实验结果表明,PMSS能够准确分析解簇结构演变过程,并且正则3-SAT问题实例的可满足相变点位于13~14,与使用Zchaff求解器得到的相变点一致,进一步验证了PMSS的有效性。

An adiabatic quantum optimization for exact cover 3 problem

A perturbation method is applied to study the structure of the ground state of the adiabatic quantum optimization for the exact cover 3 problem. It is found that the instantaneous ground state near the end of the evolution is mainly composed of the eigenstates of the problem Hamiltonian, which are Hamming close to the solution state. And the instantaneous ground state immediately after the starting is mainly formed of low energy eigenstates of the problem Hamiltonian. These results are then applied to estimate the minimum gap for a special case.

On the Solution to the Separated Equation in the 3-Particle Calogero-Moser Problem

We propose the exact solution of the equation in separated variable which appears in the process of constructing solutions to the quantum Calogero-Moser three-particle problem with elliptic two-particle potential . This solution is found for special values of coupling constants . It can be used for solving three-particle Calogero-Moser problem under the appropriate boundary conditions.

Approximation Schemes for the 3-Partitioning Problems

The 3-partitioning problem is to decide whether a given multiset of nonnegative integers can be partitioned into triples that all have the same sum. It is considerably used to prove the strong NP-hardness of many scheduling problems. In this paper, we consider four optimization versions of the 3-partitioning problem, and then present four polynomial time approximation schemes for these problems.

Structure Formation and Non Linear Electrodynamics with Attendant Changes in Gravitational Potential and Its Relationship to the 3 Body Problem

We find that having the scale factor close to zero due to a given magnetic field value, an early universe magnetic field affects how we would interpret Mukhanov’s chapter on “self reproduction of the universe”. We extend such arguments, and refer to the possibility of modified gravity. We hope that some of the issues raised by Kobayashi and Seto as to allowed inflation models may be addressed, once further refinement of these preliminary results commences. We close with statements as to the value of α in a gravitational potential proportional to r?α and how this adjustment affects the 3 body problem.

The Analysis of Convergence for the 3<i>X</i>+ 1 Problem and Crandall Conjecture for the a<i>X</i>+ 1 Problem

The 3X + 1 problem (Collatz conjecture) has been proposed for many years, however no major breakthrough has been made so far. As we know, the Crandall conjecture is a well-known generalization of the 3X + 1 problem. It is worth noting that, both conjectures are infamous for their simplicity in stating but intractability in solving. In this paper, I aim to provide a clear explanation about the reason why these two problems are difficult to handle and have very different characteristics on convergence of the series via creatively applying the probability theory and global expectancy value E(n) of energy contraction index. The corresponding convergence analysis explicitly shows that a = 3 leads to a difficult problem, while a > 3 leads to a divergent series. To the best of my knowledge, this is the first work to point out the difference between these cases. The corresponding results not only propose a new angle to analyze the 3X + 1 problem, but also shed some light on the future research.

An Analysis of Farming in the Rural Economic Development of West Virginia

Farming is still an important sector in rural economic development of West Virginia where 44% of the population lives in rural areas and 24% of the land is used for farming. While income earnings, education and employment rates are low in rural areas, poverty rates and unemployment are high compared to the urban areas. Thus, in the context of rural development farming is a potential major economic sector where 42% of the people＇s primary occupation is reported as farming. The objective of this study is to identify and estimate the potential impacts of farm employment in rural economic growth of West Virginia. Data from U.S. Bureau of Labor Statistics and U.S Census Bureau for the period of 1993 to 2008 are used for the empirical analysis. A model derived from the three simultaneous equations of Duncan is used for analysis. Three-Stage Least Squares （3SLS） method using the statistical package of STATA is used for estimation. The results concerning simultaneous relationships with population density growth, per capita income growth, and farm employment growth reveal significant importance of farming in rural economic development of West Virginia. Furthermore, the results indicate the positive impacts of population density, number of people with farming as principal occupation, and crop production on rural farming sector.

GENERALIZED UPWIND SCHEME WITH FRACTIONAL STEPS FOR 3-D PROBLEM OF CONVECTION DOMINATING GROUNDWATER TRANSPORT

A generalized upwind scheme with fractional steps for 3-D mathematical models of convection dominating groundwater quality is suggested. The mass transport equation is split into a convection equation and a dispersive equation. The generalized upwind scheme is used to solve the convection equation and the finite element method is used to compute the dispersive equation.These procedures which not only overcome the phenomenon of the negative concentration and numerical dispersion appear frequently with normal FEM or FDM to solve models of convection dominating groundwater transport but also avoid the step for computing each node velocity give a more suitable method to calculate the concentrations of the well points.

On the Change Rule of 3x + 1 Problem

This article introduces a change rule of 3x + 1 problem (Collatz conjecture), it’s named LiKe’s Rule. It’s a map of 3x + 1 problem, and details the path of each step of the change: For any positive integer, change by the Collatz conjecture. 1) This positive integer will change to an odd number;2) The odd number must change to a number of LiKe’s second sequence {3n – 1| n ∈ Z+};3) Then this 3n - 1 will change to a smaller 3n – 1 and gradually decrease to 8 (that is 32 - 1) then back to 1 in the end. If we can determine each step, the Collatz conjecture will be true. This is certainly more valuable than 2n (it might even explain 2n). And to illustrate the importance of this rule, introduced some important funny corollaries related to it.

Numerical Solution of Some Diffusion Problems in 3-Layered 3D Domain

In this paper we consider averaging and finite difference methods for solving the 3-D boundary-value problem in a multilayered domain. We consider the metal concentration in the 3 layered peat blocks. Using experimental data the mathematical model for calculating the concentration of metal at different points in peat layers is developed. A specific feature of these problems is that it is necessary to solve the 3-D boundary-value problems for the partial differential equations （PDEs） of the elliptic type of second order with piece-wise diffusion coefficients in the three layer domain. We develop here a finite-difference method for solving a problem of the above type with the periodical boundary condition in x direction. This procedure allows reducing the 3-D problem to a system of 2-D problems by using a circulant matrix.

三孩政策下0—3岁婴幼儿托育服务存在的问题与对策

2021年三孩政策在全国范围内正式实施,使得托育服务成为民生刚性需求。随着托育服务事业的迅速发展,其面临的一系列困境值得关注。从托育服务的四大主体政府、社会、教师和家庭四方面分析当前0—3岁婴幼儿托育服务存在的问题。在此基础上,提出相应的优化对策,即完善政策体系与托育制度,持续加大政府扶持力度,重点发展普惠性托育服务,提高托育服务质量,加强托育人员队伍建设,发展特色早教课程,创新社区托育模式等,以期促进0—3岁婴幼儿健康成长。