Research on coning compensation algorithms for SINS of angular rate input

To compensate the coning error of Strap-down Inertial Navigation Systems (SINS) under high dynamic angular motion, many rotation vector algorithms have been developed using angle increments information. However, most SINS use angular rate gyros. Aimed at this problem, 18 algorithms are derived based on analysis of the conventional algorithms, and corresponding coning error expressions are given. At last simulation is made which indicates that the new algorithms have much higher precision.

稻麦复种模式下氮肥与稻秸互作对小麦产量和N_(2)O排放影响及推荐施肥研究

优化氮肥施用和秸秆还田技术为途径的农业管理措施被认为是提升农业可持续性的有效手段,然而当前关于氮肥和秸秆还田对小麦产量和N_(2)O排放影响的研究仍十分有限。为此,本研究基于2000—2022年发表的关于长江中下游流域氮肥和秸秆投入下小麦产量和N_(2)O排放变化的文献,运用随机森林建模,定量分析氮肥和秸秆还田对小麦产量和N_(2)O排放的影响,并结合情景设置进行了特定地点的小麦产量和N_(2)O排放模拟,同时评估了碳排放强度(CEE)和净生态系统经济效益(NEEB)。结果表明,建立的区域尺度小麦产量与N_(2)O排放对氮秸互作响应的随机森林模型,验证结果R^(2)分别为0.66和0.65,RMSE分别为0.70和1.11。结果表明施氮量和土壤有机质是影响小麦产量和N_(2)O排放的重要因素。综合来看,达到最大产量所需的氮肥量为208~212 kg hm^(-2),达到最小CEE所需的氮肥量为113~130 kg hm^(-2),达到最高的NEEB所需的氮肥量为202~205 kg hm^(-2),其中在6.75 t hm^(-2)的秸秆投入下施用202 kg hm^(-2)的氮肥可以获得最高的生态收益1.37万元。优化氮肥和秸秆投入具备减少作物碳排放强度并获得最大净生态环境效益的潜力。

原油负压稳定装置拔出率特性分析

原油稳定装置的拔出率是原油稳定深度的决定性因素。负压稳定工艺是国内油田所采用的主要的原油稳定方式之一。针对某油田联合站负压闪蒸稳定工艺,利用HYSYS软件,模拟分析负压稳定系统操作温度、操作压力、原油含水率等对稳定装置拔出率的影响规律,明确负压稳定系统优化运行参数,提高稳定系统运行能力和水平。

增值税下两种工程计价税金计算方式的应用研究

随着政府投资管控的强化和工程总承包模式的大力推行,为更好地适应和满足投资估算、设计概算、施工图预算以及不同阶段发承包方式的计价需要,对增值税下工程计价税金计算方式进行了深入的应用研究。在介绍一般计税法和简易计税法的基础上,深入分析“人为除去进项税”及“用综合计税率计税”两种工程计价税金计算方式,提出:采用综合计税率调整工程计价规则是最适宜的工程计税方式,该方式顺应商品市场定价方法,与现行纳税规定契合。采用综合计税率在工程建设不同阶段、不同发承包模式下计价均适用。希望通过梳理需要解决的计价规则认识问题,提出税金计算建议,为“综合计税率”扫清理解障碍并奠定一定的推广应用基础。

多联机空调系统电气设计常见问题探讨

针对多联机空调系统电气设计中的一些常见问题,从室外机配电功率,断路器是否需要设置RCD,断路器降容,电缆敷设及载流量修正和室内机配电方式、控制等方面进行探讨,并给出相应的意见及建议。

基于聚类算法的叠加星座图可见光通信系统

简述了利用叠加星座图调制的方法来解决可见光多输入多输出通信系统容易受高信道相干性影响的问题,同时探究了机器学习中的聚类算法,以降低系统的误码率,提高通信传输的可靠性。研究结果表明,当星座图因受到非线性效应影响而发生旋转时,与不加入任何算法的系统相比,采用了K-means和模糊C均值算法的通信系统的误码率有了大幅度的下降,且不会受到旋转角度的影响。此外,对比分析2种聚类算法发现,K-means的原理和运算过程相对而言更加简便,可以更好地提高数据传输速率,提供更可靠安全的通信传输。

社会保险缴费调整、企业资源配置效率与宏观经济效应

文章实证检验了社会保险缴费调整对企业资源配置效率的影响及其宏观经济效应。研究发现,社会保险费率上调挤出了企业资本要素投入,企业难以维系过度依赖人口红利的增长模式,企业整体资源配置效率显著下降;社会保险费率上调通过提高劳动成本,降低企业内部现金流和增加外部融资约束,从而对投资产生了挤出效应;社会保险费率上调通过增加实际缴费额,受融资约束的企业以降低参保程度的方式降低劳动投入。此外,养老金费率降到16%时,样本期间所有企业的总量生产率年均提升了4.24%,说明社会保险降费有助于从成本端提升企业的中长期竞争力。该研究对深入理解社会保险降费引致经济增长的微观企业传导路径具有重要意义。

Positive Research on China’s Economic Growth Quality——Analyze the Fluctuating Situation of the Factor Input and Aggregative Productivity

To analyze China’s fluctuating situation of the factor input and aggregative productivity is not only the main method to seek the source of the economic growth but also the main way to weigh the level of economic growth quality.As to economic growth ofa country,the improvementofthe productivity is extremely important.The growth of the output can be realized through two kinds of ways: increasing the quantity of factor input of or improving the efficiency of the input and output.There fore, the level of economic growth quality does not mainly depend on the amount of invested factor,but the importance of improving the productivity since resources are rare. The relative improvement of efficiency in use of the invested factor marks the economic growing quality.So,in order to understand the economic growth quality of China to some extent, it must analyze Chinese factor input and aggregative productivity. This is the main topic that this text will be probed into.

FORECAST OF CHINA'S GRAINPRODUCTION DEVELOPMENT AND ITSSELF-SUPPORT RATE ANALYSIS

This far stern difficulhes and challenges fatal by the dev ofadn P in etna. to the bac national snon of China and the of and min the world market, China must meet the and Inainly by her own production. Using the input output and system edence metal, this makesa foast abbot China’s glain output, grain and allsupport rate in the year 2030.

Contribution of Agricultural Input to Output in Hohhot City

Based on the research data from the economics and management platform of Inner Mongolia Agricultural University,we analyze the changes in the input of agricultural production factors,such as farmland,labor and capital in Hohhot City. Based on the principle of econometrics,we select the agricultural production input-output data in Hohhot City during the period 1992-2010,and establish the econometric model using Cobb-Douglas production factor,to estimate the rate of contribution of agricultural input to the growth of agricultural output value,and study the quantitative relations between agricultural input and agricultural output value. The results show that in Hohhot City,the contribution of chemical fertilizer input to the growth of agricultural output value is the greatest; the contribution of mechanical power to agricultural output value is still not brought into full play; the contribution of remaining production inputs ( including technical progress) accounts for 35. 69% . In the future,Hohhot City should pay more attention to the technical input to develop agriculture.

Forecast model of safety economy contribution rate of China

It is the rational and exact computation of the safety economy contribution rate that has the far-reaching realistic meaning to the improvement of society cognition to safety and the investment to the nation safety and the national macro-safety deci-sion-makings. The accurate function between safety inputs and outputs was obtained through a founded econometric model. Then the forecasted safety economy contribution rate is 3.01% and the forecasted ratio between safety inputs and outputs is 1:1.81 in China in 2005. And the model accords with the practice of China and the results are satis-fying.

Performance of terahertz channel with multiple input multiple output techniques

Terahertz(THz) communication is being considered as a potential solution to mitigate the demand for high bandwidth. The characteristic of THz band is relatively different from present wireless channel and imposes technical challenges in the design and development of communication systems. Due to the high path loss in THz band,wireless THz communication can be used for relatively short distances. Even,for a distance of few meters( > 5 m),the absorption coefficient is very high and hence the performance of the system is poor. The use of multiple antennas for wireless communication systems has gained overwhelming interest during the last two decades.Multiple Input Multiple Output( MIMO) Spatial diversity technique has been exploited in this paper to improve the performance in terahertz band. The results show that the Bit Error Rate( BER) is considerably improved for short distance( < 5 m) with MIMO. However,as the distance increases,the improvement in the error performance is not significant even with increase in the order of diversity. This is because,as distance increases,in some frequency bands the signal gets absorbed by water vapor and results in poor transmission. Adaptive modulation scheme is implemented to avoid these error prone frequencies. Adaptive modulation with receiver diversity is proposed in this work and has improved the BER performance of the channel for distance greater than 5 m.

A QoS-aware scheduling algorithm for combined-input-crosspoint-queued switch

In this paper, we study the quality of service requirement and guaranteed-rate scheduling problem for combined-input-crosspoint-queued (CICQ) switches. Using crosspoint buffers between input queues and output ports, the input and output scheduling can be decoupled in CICQ switches. Here we propose a new guaranteed-rate scheduling algorithm which is divided seperately into input and output scheduling. Simulation results show that our algorithm can perform better than existing scheduling schemes in both packet loss and jitter control.

速效缓释型有机无机复混肥对油菜产量及肥料利用率的影响

为了解决肥料速效与缓释性问题,实现油菜“一次性施肥”的最终目标。对研制出的速效缓释型有机无机复混肥油菜专用配方和施用方法进行田间筛选及验证研究。配方及施用方法试验:油菜成熟后,检测茎秆、角壳、籽粒的全氮、全磷、全钾及干物质量,研究不同配方和施用方法对产量、肥料贡献率、农学利用率等的影响,明确速效缓释型有机无机复混肥油菜专用肥的最佳配方及施用方法;验证试验:在四川选择6个试验点,开展常规肥与速效缓释型有机无机复混肥的同田对比试验。综合分析配方筛选试验表明:SH3(18-5-7)各指标显著优于常规肥,产量、肥料贡献率、农学利用率的均值分别为3473 kg/hm^(2)、39.61%、5.56 kg/kg;施用方法试验表明:采用“基施+追施”的方法更有利于养分向籽粒运输,从而增加油菜籽产量与产值,“基肥一次性施用”次之,两者之间差异不显著,较常规施肥最高增产25.49%,增收2498元/hm^(2),产投比则是“基肥一次性施用”最高;验证试验表明:6个试验点,速效缓释型有机无机复混肥SH3(18-5-7)较常规肥农学利用率提高1.62 kg/kg,肥料贡献率提高8.57%,增产470 kg/hm^(2),肥料效益提高1632元/hm^(2)。适宜油菜种植的速效缓释型有机无机复混肥配方为SH3(18-5-7),采用“基肥一次性施用”和“基施+追施”两种方式均显著提高油菜产量、经济效益及产投比,可结合当地劳动力实际情况选择。

低热输入高效成形电弧增材制造研究进展及展望

电弧增材制造作为金属增材制造技术的一个重要分支,以电弧为载能束采用逐层堆积的方式制造金属构件,因其制造成本低、成形效率高、材料利用率高等优势,在航空航天、国防领域具有广阔的应用前景。沉积层热输入与丝材熔化效率的解耦控制是推进电弧增材制造技术高效、高质量发展与应用必须解决的关键科学与技术难题。分析了热输入与成形效率强耦合的主要原因,重点阐述现有的高效成形方法、热积累控制方法、低热输入热源的研究进展与不足,指出了未来电弧增材制造低热输入高效成形的主要发展方向。

智能反射面辅助多用户大规模MIMO系统的联合波束成形

智能反射面(Intelligent Reflecting Surface,IRS)作为面向第6代通信的关键技术之一具有创新、高效、节能和成本效益高等特点,但其联合波束成形设计为非凸优化问题,仍然是具有挑战的难题。为此,提出了一种用于IRS辅助多用户大规模多输入多输出系统的联合波束成形设计方案,以实现系统数据速率最大化。该方案在基站端采用迫零波束成形以消除用户间干扰,同时在IRS端设计了近最优反射波束成形以实现系统和数据速率最大化。仿真结果表明,该方案可获得较高的系统和数据速率,也为IRS位置布局的选择提供了数据支持与参考准则。

石油化工行业安全投入与经济效益

石油化工行业的风险因素存在环境和物的因素、技术风险、管理风险和人为因素。随着行政干预,行业安全投入逐年升高,事故伤亡人数逐年降低,但投入的增长率明显高于伤亡人数的下降速率。从表面现象来看,这种现象是不具有经济效益的,但从员工安全感影响装置的开工率出发,提高安全投入反而会带来更大的经济价值。

聚磷酸盐与水溶性磷酸二铵不同比例掺混施用对滴灌棉花产量形成和经济效应的影响

探究聚磷酸盐与常规水溶磷肥在滴灌棉田中最佳的掺混方式,以期达到磷肥施用兼顾经济和高效利用的目的。在等磷施用量下(P_(2)O_(5)120 kg/hm~2),将聚磷酸铵1(APP1)、聚磷酸铵2(APP2)和三聚磷酸钾(KTPP)按照含P_(2)O_(5)占总磷用量的10%、30%和50%与水溶性磷酸二铵掺混,形成9种不同种类的聚磷酸掺混磷肥,依次表示为APP1-10、APP2-10、KTPP-10、APP1-30、APP2-30、KTPP-30、APP1-50、APP2-50和KTPP-50。同时设置不掺混聚磷酸盐的常规水溶磷肥(DAP)和不施磷肥(P0)为对照。于滴灌棉花盛花期和盛铃期分别测定土壤深度0~20和20~40 cm土壤有效磷含量、棉花植株生物量和磷吸收量。同时监测棉花结铃动态,成熟期测定产量及产量构成。0~20 cm土壤有效磷含量、棉花地上部生物量、磷吸收量、棉花单株结铃数、籽棉产量、伏前桃数、磷肥农学利用率和产投比均随聚磷酸盐掺混比例的增加表现出增加趋势。3种不同聚磷酸盐在增加土壤有效磷含量、棉花地上部生物量、磷吸收量、棉花单株结铃数、籽棉产量、伏前桃数、磷肥农学利用率和产投比上总体表现为APP2最优,其次是KTPP,最后为APP1。在棉花盛花期和盛铃期,APP2-50处理0~20 cm土壤有效磷含量和棉花磷吸收量均显著高于DAP和其他施磷处理,20~40 cm土壤有效磷在所有施肥处理间无显著性差异。盛花期APP2-50处理棉花生物量与DAP无显著差异,但在盛铃期APP2-50棉花生物量显著高于DAP和其他施磷处理。所有聚磷酸掺混磷肥处理棉花结铃数均显著高于DAP,但棉花单铃重在各施磷处理间无差异。APP2-50处理籽棉产量、磷肥农学利用率和产投比最高。与DAP相比,APP2-50处理籽棉产量、磷肥农学利用率和产投比分别增加了10.7%、88.3%和7.6%。以上结果表明,将APP2按照含P_(2)O_(5)占总磷用量的50%与水溶性磷酸二铵掺混施用,可以提高滴灌棉田土壤有效磷含量,且对棉花产量和产投比增加有积极作用,是一种兼顾磷肥高效和经济施用的施肥选择。

Construction of Regular Rate-Compatible LDPC Convolutional Codes

In this paper, we propose a new method to derive a family of regular rate-compatible low-density parity-check（RC-LDPC） convolutional codes from RC-LDPC block codes. In the RC-LDPC convolutional family, each extended sub-matrix of each extended code is obtained by choosing specified elements from two fixed matrices HE1K and HE1K, which are derived by modifying the extended matrices HE1 and HE2 of a systematic RC-LDPC block code. The proposed method which is based on graph extension simplifies the design, and prevent the defects caused by the puncturing method. It can be used to generate both regular and irregular RC-LDPC convolutional codes. All resulted codes in the family are systematic which simplify the encoder structure and have maximum encoding memories which ensure the property. Simulation results show the family collectively offer a steady improvement in performance with code compatibility over binary-input additive white Gaussian noise channel（BI-AWGNC）.

上市公司ESG评级对审计费用的影响研究——基于审计投入与企业经营风险的中介作用

基于华证ESG评级数据,以2010—2021年我国A股上市公司为研究样本,利用固定效应模型,采用依次逐步回归法,实证检验上市公司ESG评级对审计费用的影响及作用机制。研究结果表明,上市公司良好的ESG评级能够显著降低审计费用,通过工具变量法、滞后变量、替换变量和缩短样本期等多种稳健性检验后,结果依然成立。机制分析发现,良好的ESG评级能够通过减少事务所自身审计投入和降低被审单位经营风险显著降低审计费用。进一步研究发现,在企业经国内十大会计师事务所审计时,ESG评级与审计费用间负向关系会被削弱;而在企业内控质量较高时,ESG评级与审计费用间负向关系会被加强。