“有编不补”与“临聘教师”在乡村小学何以共存?——基于J县的个案

我国已建立了县级基本财力保障机制,已培育了足够的中小学储备师资,但一些地方依旧有编不补,在乡村小学长期使用临聘教师。这种怪象根植于县级公共部门长期使用临时工的二元用工土壤,造成了乡村小学教育质量的持续低下,导致了乡村小学生的持续流出,强化了乡村小学教育管理者的避责逻辑。其背后是县级公共部门长期使用临时工的政策惯性,非“一票否决”考核语境下的行政“理性”,为纾解财政压力、应对部门间编制需求博弈的“平衡策略”,以及失范的乡村小学教师编制管理。应基于公共部门临时工问题治理的视域,审视乡村小学临聘教师问题的复杂性和长期性。在乡村教育振兴背景下,建议把“有编不补”问题纳入对县级政府的“一票否决”考核清单,通过乡村小学教师编制专项治理、盘活存量师资、建立乡村小学教师编制退出机制等举措,尽量为乡村小学补充编制。对于确实需要临聘教师填补的空缺,建议通过政府购买临时师资服务的方式,加以解决。

不确定条件下缺货不补货的库存模型分析

对以前研究得很少的一种情况——连续检查库存、提前期固定、需求随机且缺货不补进行了分析,详细推导了其最佳订货点和订货批量,并探讨了简化计算的合理性,然后用EXCEL进行了实例计算,最后进一步推广到提前期也随机的情况。

农机短板不补 粮食安全有患

保障粮食安全的要害是种子和耕地,但农机短板也不容忽视。春耕时节,记者走访江苏多所涉农高校、农机企业和农户,发现目前我国农机研发制造能力与发达国家相比仍有较大差距,精密液压、农用传感器等关键部件受制于人。

小洞不补,大洞吃苦

中队里的李帅大大咧咧,时常会犯点小错,但他却不放在心上,自认为“犯小错没关系,只要成绩跟上就行”。如果你是他的好朋友,想要帮助他改变这种想法,会怎么戏说呢?

“特岗计划”实施的现实困境与优化建议——基于辽宁省三个县区“特岗计划”实施情况的实地调研

“特岗计划”是推进城乡义务教育均衡发展、全面提高义务教育质量的有效途径。十几年来,“特岗计划”为补充乡村教师数量不足、缓解乡村教师结构性短缺、提高乡村教师队伍整体素质做出了巨大贡献,但也面临着超编县区无法及时补充教师、特岗教师没有延伸到村小和教学点、服务期满后流失率比较高、转岗和跨学科教学与课时量过大并存、特岗教师面临交通食宿诸多生活难题并承受婚恋与家庭等巨大压力等问题。“特岗计划”的未来发展,既需要优化整合教师编制动态管理、教师退出和补充以及全科教师培养使用等政策,又需要在扩大政策受益面、落实差别化补助政策、构建梯度化评价方式和晋升制度、扩大本土生源比例等运行机制方面对“特岗计划”进行调整和完善。

COMPENSATION CONTROL OF REAL-TIME UNBALANCE FORCE FOR ACTIVE MAGNETIC BEARING SYSTEM

Aiming at the stability and others properties of active magnetic bearing （AMB） system influenced by the periodic unbalance stimulation synchronous with rotor rotational speed, a new real-time adaptive feed-forward unbalance force compensation scheme is proposed based on variable step-size least mean square（LMS） algorithm as the feed-forward compensation controller. The controller can provide some suitable sinusoidal signals to com- pensate the feedback unbalance response signals synchronous with the rotary frequency, then reduce the fluctua- tion of the control currents and weaken the active control of AMB system. The variable step-size proportional to the rotational frequency is deduced by analyzing the principle of normal LMS algorithm and its deficiency in the application of real-time filtering of AMB system. Experimental results show that the new method can implement real-time unbalance force compensation in a wide frequency band, reduce the effect of unbalance stimulant force on the housing of AMB system, and provide convenience to improve rotational speed.

Incompressible Pairwise Incompressible Surfaces in Knot Exteriors

We discuss the properties of incompressible pairwise incompressible surfaces in a knot complement by using twist crossing number. Let K be a pretzel knot or rational knot that its twistindex is less than 6, and let F be an incompressible pairwise incompressible surface in S 3-K. Then F is a punctured sphere.

Clinical features of acute hepatitis E super-infections on chronic hepatitis B

AIM To examine the clinical features and risk factors for adverse outcomes in chronic hepatitis B(CHB) superimposed with hepatitis E virus(HEV).METHODS This retrospective cohort study included 228 patients with acute HEV infection(showing clinical acute hepatitis symptomology and positivity for anti-HEV immunoglobulin M) with underlying CHB(confirmed by positivity for hepatitis B surface antigen and/or hepatitis B virus(HBV) DNA over 6 mo) who had been admitted to the Shanghai Public Health Clinical Center, which represents the regional tertiary hospital for infectious diseases in Shanghai city, China. Data for adverse outcomes were collected, and included severe liver diseases(defined as liver failure and/or acute liver decompensation) and liver-related mortality. Logistic regression modeling was performed to determine the risk factors for adverse outcomes.RESULTS The symptoms caused by superimposed acute hepatitis E(AHE) were much more severe in cirrhotic patients(n = 94) than in non-cirrhotic patients(n = 134), as evidenced by significantly higher liver complications(77.7% vs 28.4%, P < 0.001) and mortality rate(21.3% vs 7.5%, P = 0.002). Most of the cirrhotic patients(n = 85, 90.4%) had no prior decompensation. Among the non-cirrhotic patients, superimposed AHE caused progressively more severe diseases that corresponded with the CHB disease stages, from immune tolerant to immune reactivation phases. Few risk factors were identified in the cirrhotic patients, but risk factors for non-cirrhotic patients were found to be intermediate HBV DNA levels(OR: 5.1, P = 0.012), alcohol consumption(OR: 6.4, P = 0.020), and underlying diabetes(OR: 7.5, P = 0.003) and kidney diseases(OR: 12.7, P = 0.005). Only 28.7% of the cirrhotic patients and 9.0% of the non-cirrhotic patients had received anti-HBV therapy previously and, in all cases, the efficacy had been suboptimal. CONCLUSION CHB-related cirrhosis and intermediate HBV DNA level were associated with severe disease in superinfected patients, and successful antiviral treatment might counter this outcome.

Golay Sequence Based Time-Domain Compensation of Frequency-Dependent I/Q Imbalance

A time-domain frequencydependent I/Q imbalance compensation scheme based on Golay complementary sequence for receiver is presented. By utilizing property of Golay sequence, the signal and its conjugate interference(image interference)in preamble are separated by correlation and used to estimate I/Q imbalance parameters.After that, a Least Square(LS) estimation of compensation filter is obtained and adopted in the compensation structure. Two applications of the presented algorithm are discussed: we could either estimate the channel along with I/Q imbalance or estimate the imbalance parameter only to maintain a lower cost. Both applications are testified by simulation. The results show that the image interference is significantly suppressed even in poor SNR condition, and the computation cost of the algorithms is low.

Sparse Approximations of the Schur Complement for Parallel Algebraic Hybrid Solvers in 3D

In this paper we study the computational performance of variants of an algebraic additive Schwarz preconditioner for the Schur complement for the solution of large sparse linear systems.In earlier works,the local Schur complements were computed exactly using a sparse direct solver.The robustness of the preconditioner comes at the price of this memory and time intensive computation that is the main bottleneck of the approach for tackling huge problems.In this work we investigate the use of sparse approximation of the dense local Schur complements.These approximations are computed using a partial incomplete LU factorization.Such a numerical calculation is the core of the multi-level incomplete factorization such as the one implemented in pARMS. The numerical and computing performance of the new numerical scheme is illustrated on a set of large 3D convection-diffusion problems;preliminary experiments on linear systems arising from structural mechanics are also reported.

Mathematical Modeling of the Oxidation of Polyunsaturated Fatty Acids in Emulsions with Stirring and Limited Oxygen Compensation

The oxidation of polyunsaturated fatty acids （PUFA） in emulsion with stirring and limited oxygen compensation was studied. A mathematical model of diffusion-oxidation was developed considering the mass transfer resistance of a gas-liquid boundary, the resistance of the boundary layer from the emulsifier membrane, and the autocatalytic-type autoxidation reaction of PUFA. The dynamic mass transfer coefficient of the emulsifier membrane, k0, was introduced. The model was verified by comparing the predictions of the model with the experi- mental data. The results indicated that the model was in good agreement with the oxygen diffusion and linoleic acid oxidation in the emulsion, and showed good applicability in the prediction of the effect of the emulsifier type on the oxidation of PUFA in the emulsion. It indicated that the oxidation of PUFA in emulsions, with stirring and limited oxygen compensation from the atmosphere, was controlled mostly by mass transfer resistance from the emulsifier membrane.

Intelligent model of rehabilitation training program for stroke

In view of the uncertainty and complexity,the intelligent model of rehabilitation training program for stroke was proposed,combining with the case-based reasoning(CBR) and interval type-2 fuzzy reasoning(IT2FR).The model consists of two parts:the setting model based on CBR and the feedback compensation model based on IT2FR.The former presets the value of rehabilitation training program,and the latter carries on the feedback compensation of the preset value.Experimental results show that the average percentage error of two rehabilitation training programs is 0.074%.The two programs are made by the intelligent model and rehabilitation physician.That is,the two different programs are nearly identical.It means that the intelligent model can make a rehabilitation training program effectively and improve the rehabilitation efficiency.

Clinical Effects of Bushen Culuan Prescription on Infertility Due to Decreased Ovarian Reserve of Kidney Deficiency and Liver Depression Pattern

Objective The objective of this study was to explore the clinical effects of Bushen Culuan prescription on infertility due to decreased ovarian reserve of kidney deficiency and liver depression pattern.Methods Totally 100 infertile patients with ovarian hypofunction treated from October 2019 to January 2022 were selected and divided into the observation group and the control group by a random number table.The control group was treated with estrogen sequential therapy,and the observation group was treated with Bushen Culuan prescription.The clinical efficacy,sex hormone levels including(follicle-stimulating hormone[FSH],luteinizing hormone[LH],and estradiol[E_(2)]),ovarian function,ovarian blood flow status(peak systolic velocity[PSV],antral follicle count[AFC],arterial pulse index[PI],and resistance index[RI]),and pregnancy outcome in the two groups were compared and analyzed.Results The total effective rate of the observation group(96.00%)was significantly higher than that of the control group(80.00%).The difference was statistically significant(p<0.05).Before treatment,there was no significant difference in sex hormone levels(FSH,LH,E_(2),and FSH/LH),ovarian function(number of primary follicles,number of dominant follicles,ovulation number,and endometrial thickness),and ovarian blood flow(PSV,RI,PI,and AFC)between the two groups(p>0.05).After treatment,the levels of serum hormones FSH,LH,E_(2),and FSH/LH decreased significantly in both groups.The number of primary follicles,dominant follicles,and ovulation increased significantly,and the thickness of endometrium decreased significantly;the indexes of PSV,RI,and AFC of ovarian blood flow increased significantly,and the PI index decreased significantly.The levels of each index in the observation group were better than those in the control group(p<0.05).In the control group,32 cases were pregnant within 1 year after treatment,and the pregnancy rate was 64.00%;21 cases in the observation group were pregnant within 1 year after treatment,and the pregnancy rate was 42.00%;the pregnancy rate in the observation group was higher than that in the control group,and the difference was statistically significant(χ^(2)=4.014,p=0.045<0.05).Conclusion Bushen Culuan prescription has a definite effect on infertility due to ovarian hypofunction.The action mechanism may involve multicomponent and multitarget stimulation to improve patients'ovarian function,regulate the level of sex hormones,and improve the pregnancy outcome.

Optimal design of auxiliary-teeth to solve circulation current reduction of permanent magnet linear synchronous motor

A discontinuity of magnetic circuits according to the end effect is generated in the permanent magnet linear synchronous motor （PMLSM）. Due to the unbalanced back electro-motive force （EMF） and impedance produced, unbalanced current is generated. The cireulatin8 current, which is caused by a decrease in the thrust, is generated by the unbalanced current. The optimal design of auxiliary-teeth at the end of the mover was carried out to solve the unbalance of phase by using design of experiment （DOE）, and compared with the basic model through finite element analysis （FEA）. As a result, the auxiliary-teeth model compensates for the decrease of thrust caused by the unbalanced phase. Also, this model is proven to reduce the detent force by the vibration and noise of the PMLSM and copper loss caused by the circulating current.

Secondary aortoduodenal fistula

Aorto-duodenal fistulae (ADF) are the most frequent aorto-enteric fistulae (80%), presenting with upper gastrointestinal bleeding. We report the first case of a man with a secondary aorto-duodenal fistula presenting with a history of persistent occlusive syndrome. A 59-year old man who underwent an aortic-bi-femoral bypass 5 years ago, presented with dyspepsia and biliary vomiting. Computed tomography scan showed in the third duodenal segment the presence of inflammatory tissue with air bubbles between the duodenum and prosthesis, adherent to the duodenum. The patient was submitted to surgery, during which the prosthesis was detached from the duodenum, the intestine failed to close and a gastro-jejunal anastomosis was performed. The post-operative course was simple, secondary ADF was a complication (0.3%-2%) of aortic surgery. Mechanical erosion of the prosthetic material into the bowel was due to the lack of interposed retroperitoneal tissue or the excessive pulsation of redundantly placed grafts or septic procedures. The third or fourth duodenal segment was most frequently involved. Diagnosis of ADF was difficult. Surgical treatment is always recommended by explorative laparotomy. ADF must be suspected whenever a patient with aortic prosthesis has digestive bleeding or unexplained obstructive syndrome. Rarely the clinical picture of ADF is subtle presenting as an obstructive syndrome and in these cases the principal goal is to effectively relieve the mechanical bowel obstruction.

A Case Study Survey of the Impact of the Inductive Loads on Power Quality

Power quality is a complex term that is defined by the legislation, but also as an obligation of the supplier and customer. The customer must return the negative effects of its consumers （taking reactive power, harmonic generation, phase unbalance） down to the prescribed limits. This primarily refers to the presence of non-linear consumers, leading to distortion of the basic parameters of voltage and current, in steady or transient conditions, and therefore the deformation of waveform. One way to reduce the negative feedback effects, especially with inductive loads, is the reactive energy compensation. The paper presents one of the solution for reactive power compensation, applied on the pumping station of public company ＂Waterworks and Sewerage---Bar＂, Bar.

HYBRID FILTER WITH PREDICT-ESTIMATOR AND COMPENSATOR FOR THE LINEAR TIME INVARIANT DELAYED SYSTEM

This paper investigates the problem of real-time estimation for one kind of linear time invariant systems which subject to limited communication capacity. The communication limitations include signal transmission delay, the out-of-sequence measurements and data packet dropout, which appear typically in a network environment. The kernel of filter design is equally to formularize the traditional Kalman filter as one linear weighted summation which is composed of the initial state estimate and all sequential sampled measurements. For it can adapt aforementioned information limitations, the linear weighted summation is then decomposed into two stages. One is a predict-estimator composed by all reached measurements, another is one compensator constructed by those time-delayed data. In the network environment, there are obvious differences between the new hybrid filter and those existing delayed Kalman filters. For example, the novel filter can be optimal in the sense of linear minimum mean square error as soon as all measurements available and has the lowest running time than these existing delayed filters. One simulation, including two cases, is utilized to illustrate the design procedures proposed in this paper.

Skulls Symmetry of ＂White Rasquera＂ Goat

Three common categories of bilateral asymmetry have been described： directional asymmetry, antisymmetry, and FA （fluctuating asymmetry）. FA is the most subtle of the three types of asymmetry, and differs from the patterns of the others in that paired structures tend to be symmetric in size. The analysis of FA allows to estimate the influence of stress factors on animal development and enables evaluation of resistance to stress. The aim of this work was to estimate the symmetry of skulls of a contemporary pure goat breed, as there is currently no study of FA as an estimate of individual quality for domestic goats. For this purpose, 11 landmarks were digitized in two dimensions from the crania of 24 adult goats （12 males and 12 females） belonging to the ＂White Rasquera＂ breed. The skulls showed nearly perfect bilateral symmetry. The low detected values of FA in skulls revealed a weak influence of developmental stress on this goat contemporary population and its strong ability to compensate stress.

古人如何重农抑奢,扶贫济弱

《道德经》第77章曰:“天之道,损有余而补不足。”如果放任有余而不损、不足而不补,必定会因贫富悬殊而导致社会冲突。而简单地追求经济增长不能解决两极分化的问题。贫富悬殊是经济发展不均衡的产物。财富集中在少数人的手里,民众就难以真正富裕。