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Calcium-based polymers for suppression of soil acidification by improving acid-buffering capacity and inhibiting nitrification

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Journal of Environmental Sciences 2024年第5期139卷 138-149页

作者： Fei Kang Yunshan Meng Yanning Ge Yun Zhang Haixiang Gao xueqin ren Jie Wang Shuwen Hu Beijing Key Laboratory of Farmland Soil Pollution Prevention-control and Remediation College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China Department of Applied Chemistry China Agricultural UniversityBeijing 100193China

Soil acidification is a major threat to agricultural sustainability in tropical and subtropical regions.Biodegradable and environmentally friendly materials,such as calcium lignosulfonate(CaLS),calcium poly(aspartic acid)(PASP-Ca),and calcium polyγ-glutamic acid(γ-PGA-Ca),are known to effectively ameliorate soil acidity.However,their effectiveness in inhibiting soil acidification has not been studied.This study aimed to evaluate the effect of CaLS,PASP-Ca,andγ-PGA-Ca on the resistance of soil toward acidification as directly and indirectly(i.e.,via nitrification)caused by the application of HNO_(3)and urea,respectively.For comparison,Ca(OH)_(2)and lignin were used as the inorganic and organic controls,respectively.Among the materials,γ-PGA-Ca drove the substantial improvements in the pH buffering capacity(pHBC)of the soil and exhibited the greatest potential in inhibiting HNO_(3)-induced soil acidification via protonation of carboxyl,complexing with Al~(3+),and cation exchange processes.Under acidification induced by urea,CaLS was the optimal one in inhibiting acidification and increasing exchangeable acidity during incubation.Furthermore,the sharp reduction in the population sizes of ammonia-oxidizing bacteria(AOB)and ammonia-oxidizing archaea(AOA)confirmed the inhibition of nitrification via CaLS application.Therefore,compared to improving soil pHBC,CaLS may play a more important role in suppressing indirect acidification.Overall,γ-PGA-Ca was superior to PASP-Ca and CaLS in enhancing the soil pHBC and the its resistance to acidification induced by HNO_(3) addition,whereas CaLS was the best at suppressing urea-driven soil acidification by inhibiting nitrification.In conclusion,these results provide a reference for inhibiting soil re-acidification in intensive agricultural systems.

关键词： Calcium-based polymer Soil acidification pH buffering capacity Nitrification inhibition

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针织物图案变化与精准纺纱工艺的关系模型

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毛纺科技 2024年第3期52卷 51-55页

作者：董真真李文雅孟天玉梁建行任学勤西安工程大学纺织科学与工程学院陕西西安710048

为进一步确定基于一根结构可控的自固结子线经过织造可直接在织物上形成精准图案的尺寸变化与纺纱工艺之间的关系,以织物尺寸不变、图案等比例放大为研究要点,分析随着图案大小变化时各纱线段长度以及纺纱时间的变化规律,最终建立图案... 详细信息

为进一步确定基于一根结构可控的自固结子线经过织造可直接在织物上形成精准图案的尺寸变化与纺纱工艺之间的关系,以织物尺寸不变、图案等比例放大为研究要点,分析随着图案大小变化时各纱线段长度以及纺纱时间的变化规律,最终建立图案放大倍数与精准纺纱工艺的关系模型。以基础图案为基准,2个矩形图案间距不变,分别将矩形横向放大2倍和3倍。经过纺纱织造后分析可得:图案放大倍数(a)与循环纱长L呈(L)=1.65a+67.17的线性关系;各结构段长度及纺纱时间也呈现线性规律变化;所得精准纺纱工艺计算模型可快速确定各纱线段长度及运行时间,为织物图案尺寸变化后相对应的精准纺纱工艺参数预测提供了依据,减少试织次数和成本,提高制备效率。

关键词：精准图案图案放大循环纱长纺纱工艺

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福建龙栖山国家级自然保护区林下鸟类和兽类资源的红外相机监测

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陆地生态系统与保护学报 2024年第2期4卷 90-99页

作者：任雪琴邹智超袁鑫肖忠辉吴迪中国农业大学资源与环境学院北京100193 福建龙栖山国家级自然保护区管理局三明353305 中国科学院沈阳应用生态研究所沈阳110016

【目的】深入了解福建龙栖山国家级自然保护区野生动物资源现状。【方法】从2022年6月至2023年6月,在保护区内布设了33台红外相机对鸟类和兽类多样性进行初步调查。【结果】调查累计11680个相机工作日,共获得照片15009张,其中可识别物... 详细信息

【目的】深入了解福建龙栖山国家级自然保护区野生动物资源现状。【方法】从2022年6月至2023年6月,在保护区内布设了33台红外相机对鸟类和兽类多样性进行初步调查。【结果】调查累计11680个相机工作日,共获得照片15009张,其中可识别物种的独立有效照片2831张,记录到兽类和鸟类共22种,其中兽类16种,隶属于5目9科;鸟类6种,隶属于2目3科。发现国家一级重点保护野生动物3种,即黑麂(Muntiacus crinifrons)、黄腹角雉(Tragopan caboti)和白颈长尾雉(Sytmaticus ellioti);国家二级重点保护野生动物6种,分别是黑熊(Ursus thibetanus)、猕猴(Macaca mulatta)、短尾猴(M.arctoides)、中华鬣羚(Capricornis milneedwardsii)、白鹇(Lophura nycthemera)和白眉山鹧鸪(Arborophila gingica);被IUCN红色名录评估为易危(VU)的动物6种以及隶属于近危(NT)的动物1种。兽类相对多度指数最高的是小麂(M.reevesi)(RAI=7.852),鸟类相对多度指数最高的是白鹇(RAI=8.031)。【结论】调查补充了福建龙栖山国家级自然保护区的鸟兽多样性数据,调查结果反映了现今保护区内野生动物资源状况,为保护区野生动物保护和资源管理提供了参考信息,是保护区系统建立野生动物监测体系、有效开展保护管理的基础,并可为长期的生物多样性监测和评价提供支撑。

关键词：龙栖山生物多样性鸟类兽类分布现状红外相机陷阱

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A FAS approach for stabilization of generalized chained forms: part 1. Discontinuous control laws

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Science China(Information Sciences) 2024年第2期67卷 118-143页

作者： Guang-ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology Center for Control Science and Technology Southern University of Science and Technology

In this paper, a type of general nonholonomic systems is proposed, which contains both the Brockett’s two example systems, and their extended n-dimensional chained forms, as special cases. For the stabilization of such systems, a stabilizing controller is proposed based on the fully actuated system(FAS)approach, which is discontinuous at the origin but time-invariant when the open-loop system is time-invariant,and drives the feasible trajectories of the system to the origin exponentially. Furthermore, the proposed FAS approach is also extended to the sub-normal system case and the time-delay system case.

关键词： nonholonomic systems feedback stabilization exponential convergence sub-fully actuated systems time-delay systems

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Big Bucks Hit China

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Beijing Review 2007年第4期50卷 40-41页

作者： By ren xueqin

The article discusses the results of the 2006 Annual Study Report on Private Equity Investment in China issued by Zero2IPO in Shanghai in December 2006. According to the report, 35 private equity funds that invest solely in the Asian market successfully raised capital of $12.161 billion from January to November 2006. Traditional industries are most favored by private equity funds with regard to industry preferences. The report also found that 26 private equity funds successfully exited investments in 2006.

关键词： IPO Big Bucks Hit China

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Elemene Antitumor Drugs Development Based on "Molecular Compatibility Theory" and Clinical Application: A Retrospective and Prospective Outlook

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Chinese Journal of Integrative Medicine 2024年第1期30卷 62-74页

作者： JIANG Xiao-ying SHI Li-ping ZHU Jun-long BAI ren-ren XIE Tian School of Pharmacy Hangzhou Normal UniversityHangzhou(311121)China Key Laboratory of Elemene Class Anti-cancer Chinese Medicines Engineering Laboratory of Development and Application of Traditional Chinese MedicinesCollaborative Innovation Center of Traditional Chinese Medicines of Zhejiang ProvinceHangzhou Normal UniversityHangzhou(311121)China Good Clinical Practice Center Affliliated Hospital of Nanjing University of Chinese MedicineNanjing(210000)China

Elemene, derived from Curcuma wenyujin, one of the "8 famous genuine medicinal materials of Zhejiang province," exhibits remarkable antitumor activity. It has gained wide recognition in clinical practice for effectiveness on tumors. Dr. XIE Tian introduced the innovative concept of "molecular compatibility theory" by combining Chinese medicine principles, specifically the "monarch, minister, assistant, and envoy" theory, with modern biomedical technology. This groundbreaking approach, along with a systematic analysis of Chinese medicine and modern biomedical knowledge, led to the development of elemene nanoliposome formulations. These novel formulations offer numerous advantages, including low toxicity, well-defined composition, synergistic effects on multiple targets, and excellent biocompatibility. Following the principles of the "molecular compatibility theory", further exploration of cancer treatment strategies and methods based on elemene was undertaken. This comprehensive review consolidates the current understanding of elemene's potential antitumor mechanisms, recent clinical investigations, advancements in drug delivery systems, and structural modifications. The ultimate goal of this review is to establish a solid theoretical foundation for researchers, empowering them to develop more effective antitumor drugs based on the principles of "molecular compatibility theory".

关键词： molecular compatibility theory Chinese integrative medicine elemene antitumor activity drug delivery structural modification

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Study on the mechanism and reaction characteristics of metal-supported phosphogypsum as oxygen carrier in a chemical looping gasification application

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Journal of Environmental Sciences 2024年第4期138卷 428-438页

作者： Jing Yang Yujie ren Shuoyu Chen Jinsuo Lu School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China

This study aimed to explore the chemical looping gasification(CLG)reaction characteristics of the metal-supported composite phosphogypsum(PG)oxygen carriers(OCs)and the thermodynamic mechanism.The FactSage 7.1 thermodynamic simulation was used to explore the oxygen release and H_(2)S removal mechanisms.The experimental results showed that the syngas yield of CLG with PG-CuFe_(2)O_(4)was more than that with PG-Fe_(2)O_(3)20/CuO40 or PG-Fe_(2)O_(3)30/CuO30 OC at 1023 K when the water vapor content was 0.3.Furthermore,the maximum syngas yield of the CO selectivity was 70.3% and of the CO_(2)selectivity was 23.8%.The H_(2)/CO value was 0.78,and the highest carbon conversion efficiency was 91.9% in PG-CuFe_(2)O_(4)at the gasification temperature of 1073 K.The metal-supported PG composite oxygen carrier was proved not only as an oxygen carrier to participate in the preparation of syngas but also as a catalyst to catalyze coal gasification reactions.Furthermore,both the experimental results and FactSage 7.1 thermodynamic analysis revealed that the trapping mechanism of H_(2)S by composite OCs was as follows:CuO first lost lattice oxygen as an oxygen carrier to generate Cu_(2)O,which,in turn,reacted with H_(2)S to generate Cu_(2)S.This study provided efficient guidance and reference for OC design in CLG.

关键词： Metal-supported composite phosphogypsum Reaction characteristics Thermodynamic mechanism Chemical looping gasification

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Event-triggered H_(∞) consensus control for input-constrained multi-agent systems via reinforcement learning

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Control Theory and Technology 2024年第1期22卷 25-38页

作者： Jinxuan Zhang Chang-E ren College of Information Engineering Capital Normal UniversityBeijing100089China

This article presents an event-triggered H_(∞) consensus control scheme using reinforcement learning (RL) for nonlinear second-order multi-agent systems (MASs) with control constraints. First, considering control constraints, the constrained H_(∞) consensus problem is transformed into a multi-player zero-sum game with non-quadratic performance functions. Then, an event-triggered control method is presented to conserve communication resources and a new triggering condition is developed for each agent to make the triggering threshold independent of the disturbance attenuation level. To derive the optimal controller that can minimize the cost function in the case of worst disturbance, a constrained Hamilton–Jacobi–Bellman (HJB) equation is defined. Since it is difficult to solve analytically due to its strongly non-linearity, reinforcement learning (RL) is implemented to obtain the optimal controller. In specific, the optimal performance function and the worst-case disturbance are approximated by a time-triggered critic network;meanwhile, the optimal controller is approximated by event-triggered actor network. After that, Lyapunov analysis is utilized to prove the uniformly ultimately bounded (UUB) stability of the system and that the network weight errors are UUB. Finally, a simulation example is utilized to demonstrate the effectiveness of the control strategy provided.

关键词： H_(∞)optimal control Input constrains Multi-agent systems(MASs) Reinforcement learning(RL)

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A Comprehensive Overview of the Neural Mechanisms of Light Therapy

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Neuroscience Bulletin 2024年第3期40卷 350-362页

作者： Xiaodan Huang Qian Tao Chaoran ren Guangdong-Hongkong-Macao Institute of CNS Regeneration Ministry of Education CNS Regeneration Collaborative Joint LaboratoryJinan UniversityGuangzhou 510632China Psychology Department School of MedicineJinan UniversityGuangzhou 510632China

Light is a powerful environmental factor influencing diverse brain functions.Clinical evidence supports the beneficial effect of light therapy on several diseases,including depression,cognitive dysfunction,chronic pain,and sleep disorders.However,the precise mechanisms underlying the effects of light therapy are still not well understood.In this review,we critically evaluate current clinical evidence showing the beneficial effects of light therapy on diseases.In addition,we introduce the research progress regarding the neural circuit mechanisms underlying the modulatory effects of light on brain functions,including mood,memory,pain perception,sleep,circadian rhythm,brain development,and metabolism.

关键词： Light therapy Neural circuit Mood Cognition Pain Sleep Development Metabolism

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A FAS approach for stabilization of generalized chained forms: part 2. Continuous control laws

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Science China(Information Sciences) 2024年第3期67卷 114-135页

作者： Guang-ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and Technology

In this paper, continuous time-varying stabilizing controllers for the type of general nonholonomic systems proposed and treated in part 1 are designed using the fully actuated system(FAS) approach. The key step is to differentiate the first scalar equation, and by control of the obtained second-order scalar system, a proportional plus integral feedback form for the first control variable is obtained. With the solution to this designed second-order scalar system, the rest equations in the nonholonomic system form an independent time-varying subsystem which is then handled by the FAS approach. The overall designed controller contains an almost arbitrarily chosen design parameter, and is proven to guarantee the uniformly and globally exponential stability of the closed-loop system. The proposed approach is simple and effective,and is demonstrated with a practical example of ship control.

关键词： nonholonomic systems feedback stabilization fully actuated systems Lyapunov stability continuous controllers

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