粮食安全视域下耕地保护制度构建的三维进路研究

作为粮食生产最基本物质条件的耕地,通过其功能的发挥源源不断为我们提供粮食作物,因此,保护耕地是确保粮食安全的逻辑起点。但当前以《土地管理法》为中心架构的耕地保护制度中,仍有诸多束缚粮食安全实现的困境,诸如对耕地保护目标存在认知和导向的不足,耕地保护主体缺位,耕地保护模式相对单一。针对既有耕地保护制度面临的三重困境,亟待推动耕地“三位一体”的全要素均衡实现,推进政府、市场主体和社会主体的协同参与,实现管控性、建设性以及激励性保护方式的耦合,从而构建起耕地保护制度的三维进路。

我国农村普惠金融发展法律保障体系的构建

农村普惠金融既是农村金融发展目标与理念的重要创新,也是农村金融发展的高级形态。农村普惠金融发展战略的实现,不仅需要更新理念与价值目标,也需要完善法律保障体系。我国虽已初步建立农村普惠金融发展法律保障体系,但在指导理念、原则组成、体系框架、制度建设等方面还存在不科学、不适应、不系统、不完善的问题。我国农村普惠金融发展法律保障体系的构建,应贯彻普惠金融理念的指引作用,坚持市场主导调节、彰显金融公平、促进公众参与、差异化调整、强化金融消费者权益保护的基本原则,构筑以《促进农村金融发展法》为龙头,以农村商业金融法、农村政策金融法、农村合作金融法、民间金融法等为分支的法律框架体系,并从农村普惠金融发展管控、农村弱势者金融权利保护、制度实施保障三个维度构建基本制度体系。

基于P2PSIP的移动实时流媒体系统的安全架构

在分析移动实时流媒体应用对P2P环境提出的安全性方面挑战的基础上,提出了基于P2PSIP的移动实时流媒体系统MPSLSS的安全架构。针对MPSLSS系统的可管控性设计了一种分层混合式P2P网络架构,并采用STRIDE模型举例分析了MPSLSS系统面临的安全威胁,在此基础上提出了一种适用于移动实时流媒体应用的系统安全架构,并对其进行了分析。

基于多角度的陆域生态保护红线评估调整研究——以福建省漳州市为例

福建省漳州市自2019年开展生态保护红线评估调整工作以来,出现了红线生态价值效率降低、红线图斑格局两极分化、红线管控规则不明确等问题。文章以福建省漳州市陆域生态保护红线为研究对象,运用景观格局分析法、NPP定量分析法等方法,从生态格局完整性、生态系统功能性和生态空间管控性角度对各县(市、区)生态保护红线评估调整中间成果进行分析总结,并在管控规则、空间优化和实施监督三个方面对后续的生态保护红线管控实施工作提出建议。

从“管控”到“共享”:编制资源的统筹分配及其社会化治理——以L省Y市案例为中心的质性研究

统筹编制改革是党中央基于新时代提出的重要要求,应当结合结构优化、存量盘活与资源整合等关键点,对地方统筹编制资源、进行编制统筹分配的经验和教训进行观察,明确编制作为内部资源的有限性、可分配性以及使用受监督性。本文选取L省Y市为样本,对其编制资源的规划、统筹分配以及纪律监督情况进行描述,指出在科层制思维下出现的编内、编外人员的工作困境,在盲目求效的工作习惯下出现的专户竞赛与专户冗余的实践困境,以及在僵化执行纪律的情况下用人自主权与编制管控权的矛盾。根据L省Y市的相关构想以及初步实践,提出对“管控式”的编制统筹管理有所补充的“共享式”社会化治理模式。这一模式强调在编制规划过程中的多方参与,在编制分配的过程中进行多向研究,在编制监督的过程中采取多重规范的保障措施,促进编制资源在统筹分配之下,形成社会各方权责明确的共建、共治、共享格局。

Fuzzy variable structure delay control algorithms and their applications to AQM

This paper analyzes the fuzzy variable structure control algorithms for delay systems and describes the compensation mechanism of the integral factor to the effect of the delay. Based on the linearized model of the congestion-avoidance flow-control mode of transmission control protocol (TCP), we present delay control algorithms for active queue management (AQM) and discuss the parameter tuning of the algorithms. The NS (network simulator) simulation results show that the proposed control scheme for the nonlinear TCP/AQM model has good performance and robustness with respect to the uncertainties of the round-trip time (RTT) and the number of active TCP sessions. Compared to other similar schemes, our algorithms perform better in terms of packet loss ratio, throughput and butter fluctuation.

ENERGY STATE APPROACH TO THE INTEGRATED FLIGHT PERFORMANCE MANAGEMENT OF COMMERCIAL AIRCRAFT

The integrated aircraft flight performance management techniques are discussed in this paper based on the point-mass energy state approximation principle. The flight performance optimization algorithms, developed with energy state approximation approach, are first introduced, the functionally integrated flight path/speed control system, so called total energy control system (TECS), is then discussed, and the guidance technique and algorithms, which relate the performance optimization results directly with the TECS, are analyzed and developed. Digital simulation results for a specific transport aircraft model demonstrate the satisfactory performances of the resulted flight performance management system.

Design of a 4.224GHz Quadrature LC-VCO

A 4. 224GHz quadrature voltage-controlled oscillator （QVCO） applied in MB-OFDM UWB synthesizers is implemented in 0.18μm RF-CMOS technology. An improved structure of the QVCO is presented for better phase noise. A novel configuration of a MOS varactor is designed for good linearity of K as well as a new digital capacitor controlled array topology with lower parasitic capacitance and lower Ron. Measurement results show a phase noise of - 90.4dBc/Hz at 100kHz offset and - 116.7dBc/Hz at 1MHz offset from a carrier close to 4. 224GHz. The power dissipation is 10. 55mW from a 1.8V supply.

Controllability, Budget Flexibility and New Model of Budgeting System

How to extend the flexibility of the budget control to adapt for need of strategy management and management control is a difficult and very important problem. The purpose of this paper is to study tentatively this problem based on the extant results of controllability principle and budgeting in management control system of organization. In this paper, three main results are as follows： （1） To disclose that the controllability of an organization is one characteristic of the budgeting systems and the controllability is not impartial and not single personal action. （2） To discuss tentatively an improved budgeting system to improve the several weaknesses of traditional budgeting control that Otley （1999） summarized from the academic and practitioner literatures in order to improve the controllability of strategy management with budget flexibility. （3） To build the new model of flexible budget with three new features： it makes strategy objectives easily achievable and controllable; it makes controllers have a more strategic role; it can balance these multiple goals when they cannot be achieved simultaneously and external conditions are more demanding.

High stable power control of alaser diode

In this paper,the low and the high frequency noises of a laser diode have been analyzed. Based on the analysis a novel scheme that adapts analog and digital hybrid techniques is proposed to stabilize the output power of a laser diode. With the hybrid controller,the low and the high frequency noises of a laser diode are conspicuously reduced.By accurate calculation,the short-term stability of the output power of laser diode reaches ±0.55‰, and the long-term stability is ±0.7‰.

Iterative Learning Model Predictive Control for a Class of Continuous/Batch Processes

An iterative learning model predictive control （ILMPC） technique is applied to a class of continuous/batch processes. Such processes are characterized by the operations of batch processes generating periodic strong disturbances to the continuous processes and traditional regulatory controllers are unable to eliminate these periodic disturbances. ILMPC integrates the feature of iterative learning control （ILC） handling repetitive signal and the flexibility of model predictive control （MPC）. By on-line monitoring the operation status of batch processes, an event-driven iterative learning algorithm for batch repetitive disturbances is initiated and the soft constraints are adjusted timely as the feasible region is away from the desired operating zone. The results of an industrial application show that the proposed ILMPC method is effective for a class of continuous/batch processes.

Dielectric Properties of ZrTiO4 Thin Films Prepared by Reactive DC Magnetron Co-sputtering

ZrTiO4 is a small ceramic constituent material which has very good thermal and electrical properties. ZrTiO4 thin films were deposited by reactive dc magnetron co-sputtering method. The crystal structure, surface morphology, thickness and dielectric properties were characterized by XRD （X-ray diffraction）, AFM （atomic force microscopy）, FE-SEM （field emission scanning electron microscope）, and precision impedance analyzer respectively. These films were crystallization of the orthorhombic phase （111） of ZrTiOa. The microstructure of well-crystallized ZrTiO4 thin films had the surface morphology was smooth with 1.695 nmrms roughness. The high dielectric constant width decreases from 129.2 to 110.6 when sputtering current increases which are higher more than that had researched because of higher energy but impedance; ｜Z｜ increases from 1.97 to 2.47 kΩ. These results are consistent with the RMS roughness results, which are the RMS roughness decrease with increasing sputtering current.

Proximal and distal esophageal sensitivity is decreased in patients with Barrett’s esophagus

AIM: To investigate sensations to multimodal pain stimulation in the metaplastic and normal parts of the esophagus in patients with Barrett’s esophagus (BE). METHODS: Fifteen patients with BE and 15 age-matched healthy volunteers were subjected to mechanical, thermal and electrical pain stimuli of the esophagus. Both the metaplastic part and the normal part (4 and 14 cm, respectively, above the esophago-gastric junction) were examined. At sensory thresholds the stimulation intensity, referred pain areas, and evoked brain potentials were recorded. RESULTS: Patients were hyposensitive to heat stimulation both in the metaplastic part [median stimulation time to reach the pain detection threshold: 15 (12-34) s vs 14 (6-23) s in controls; F = 4.5, P = 0.04] and the normal part of the esophagus [median 17 (6-32) s vs 13 (8-20) s in controls; F = 6.2, P = 0.02]. Furthermore, patients were hyposensitive in the metaplastic part of the esophagus to mechanical distension [median volume at moderate pain: 50 (20-50) mL vs 33 (13-50) mL in controls; F = 5.7, P = 0.02]. No indication of central nervous system abnormalities was present, as responses were comparable between groups to electrical pain stimuli in the metaplastic part [median current evoking moderate pain: 13 (6-26) mA vs 12 (9-24) mA in controls; F = 0.1, P = 0.7], and in the normal part of the esophagus [median current evoking moderate pain: 9 (6-16) mA, vs 11 (5-11) mA in controls; F = 3.4, P = 0.07]. Furthermore, no differences were seen for the referred pain areas (P-values all > 0.3) or latencies and amplitudes for the evoked brain potentials (P-values all > 0.1). CONCLUSION: Patients with BE are hyposensitive both in the metaplastic and normal part of esophagus likely as a result of abnormalities affecting peripheral nerve pathways.

Synergetic Analysis and Possible Control of Vortex-Induced Vibrations in a Fluid-Conveying Steel Catenary Riser

This work aimed to demonstrate possibilities for both active and passive control of the vortex-induced vibration and fatigue life of steel catenary risers via an analysis of the self-organization and evolution of the structural vibration based on synergetic theory. An analysis of the complex interrelated and synergistic relationship between the order parameter and the fast variable was performed, and the master equation of the nodal displacements was established as the order parameter for the evolution of the riser's structural vibration. Passive control methods include modifying the structure's elastic modulus, the internal fluid velocity, the top tension and the structural damping ratio, while an active control involves adjusting the external flow rate. Optimized parameters were obtained by analyzing the non-steady state solution of the master equation. The results show that the fatigue life greatly increases as the riser's elastic modulus decreases. In contrast, the fatigue life decreases with an increase of the internal fluid velocity. With an increase of the top tension, the vibration amplitudes and the number of modes may decrease, resulting in fewer bending stress cycles and a longer fatigue life. Furthermore, the structural damping ratio should be as large as possible. Finally, an active and passive control of the riser structure's response to vortex-induced vibration and its fatigue life can be achieved by carefully modifying the parameters mentioned above. The results may provide a theoretical framework for engineering practice concerning the design and control of steel catenary riser structures which are affected by vortex-induced vibration.

Weld Characteristics and NC Bending Formability of QSTE340 Welded Tube

The mechanical characteristics of the weld joint were investigated by tensile test, microstructure test, and microhardness test. The welded tube NC bending tests were carried out to evaluate the weld on the formability of the QSTE340 welded tube. The results show that the wall thinning degree, cross-sectional deformation and springback angle increase significantly as the weld line is located on the outside of the bend compared with that located on the middle and inside, and the welded tubes produce nearly identical performance as the weld line is located on the middle and inside. The wall thickening degree decreases much as the weld line is located on the inside of the bend. So the welded tube can acquire good bending formability as the weld line is located in the region away from the outside of the bend.

The expression of the jigging bed porosity and its realizing of the computer detection system

This paper proposes the expression of the jigging bed porosity based on the jumping height of the jigging bed and water wave. This kind of expression can help to realize the jigging process automation and intelligence. The computer detection system is also developed.

Hybrid Operation of Fault Current Limiter and Thyristor Controlled Braking Resistor

The effectiveness of a combination of fault current limiter and thyristor controlled braking resistor on power system stability enhancement and damping turbine shaft torsional oscillations has been studied. If both devices operate at the same bus, the stabilization control scheme can be carried out continuously and with flexibility. As a result, the fault currents are limited, and the generator disturbances and the turbine shaft torsional oscillations are converged quickly. In this paper, the effectiveness of the combination of both devices has been demonstrated by considering 3LG （three-lines-to-ground） fault in a two-machine infinite bus system. Also, temperature rise effect of both devices with various resistance values and weights has been demonstrated. Simulation results indicate a significant power system stability enhancement and damping turbine shaft torsional oscillations as well as with allowable temperature rise.

Control Power Source of PV-10 Piezoelectric Crystal Valve

Parameters of the power source used to control PV-10 piezoelectric crystal valve are following DC output voltage： 0 - 120 V, continuously controllable, linear enlargement factor of input direct current voltage： approximate 25 times, the accuracy of DC output voltage： ±5%, manual control and automatic control.

Consumer Central Energy Flexibility in Office Buildings

Energy flexibility in buildings will play an important role in the smart energy system. Office buildings have more potentials to provide energy flexibility to the grid compared to other types of buildings, due to the existing building management, control systems and large energy consumption. Consumers in office buildings （building owners/managers and occupants） take a main role for adopting and engaging in building energy flexibility. This paper provides a systematic review of consumer central energy flexibility in office buildings with the discussion of social, technical and business aspects. This paper clarifies the correlations of consumers＇ concems, external influential factors, energy flexibility resources and technology with eight hypotheses. This paper suggests that technical solutions with the integration of distributed energy resources, building management and control system can boost energy flexibility in the office buildings.

A Phenomenological Understanding of Digital Processes of Subjectification： The Example of Lifelogging

By lifelogging, we understand a specific, very recent phenomenon of digital technology, which falls within the range of practices of the quantified self. It is a complex form of self-management through self-monitoring and self-tracking practices, which combines the use of wearable computers for measuring psycho-physical performances through specific apps for the processing, selecting and describing of the data collected, possibly in combination with video recordings. Given that lifelogging is becoming increasingly widespread in technologically advanced societies and that practices related to it are becoming part of most people＇s everyday lives, it is more important than ever to gain an understanding of the phenomenon. In this paper, I am interested in particular in exploring the issue of the transformations in the perception, comprehension, and construction of self, and hence in subjectification practices, deriving from the new digital technologies, and especially lifelogging.