Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： A hexadecanol-palmitic acid-lauric acid/SiO2 composite as phase change material for humidity control was prepared with SiO2 as carrier and hexadecanol- palmitic acid- lauric acid as phase change material. The performance, molecular structure and morphology of the prepared composite were characterized by using methods of isothermal sorption, cooling curve, FT-IR, SEM, LPSA, TG, DSC and so on. The results show that SiO2 was good coated with hexadecanol-palmitic acid-lauric acid; the prepared phase change material exhibits good performance both in temperature- and humidity-control.
Subjects: Biology >> Ecology submitted time 2018-03-14 Cooperative journals: 《生态学报》
Abstract：土壤微生物是反映土壤质量状况的重要指标，研究侵蚀地植被恢复后土壤微生物群落结构的变化对深入认识土壤质量的演变具有重要意义。对比分析了未治理地（Y0）、治理13年（Y13）和31年（Y31）的马尾松林（Pinus massoniana）林下芒萁（Dicranopteris dichotoma）覆盖地（NRd）、去除芒萁覆盖地（Rd）与林下裸地（CK）土壤微生物生物量和群落结构差异，结果表明：林下裸地土壤微生物生物量碳（MBC）、微生物生物量氮（MBN）和总微生物磷脂脂肪酸量（总PLFAs）的含量均显著低于芒萁覆盖地，且去除芒萁4个月后，MBC和总PLFAs均有降低趋势，表明芒萁覆盖对土壤微生物生物量具有重要影响；林下芒萁覆盖地土壤革兰氏阳性菌（GP）、革兰氏阴性菌（GN）、丛植菌根真菌（VAM）、真菌（Fungi）、放线菌（ACT）的PLFAs含量显著高于林下裸地（Y13例外），去除芒萁4个月后，各值均有有接近林下裸地的趋势；芒萁覆盖地真菌/细菌的比值（F/B）均显著高于林下裸地（P P P < 0.05）（Y13例外），意味着芒萁覆盖地土壤生态系统更稳定，土壤的养分可利用性更高，微生物生物量和群落结构更丰富，活性更强；皮尔逊相关分析和冗余分析发现，土壤理化性质与土壤微生物生物量和群落结构关系密切，土壤C/N、pH和氮素水平是调控芒萁覆盖下土壤微生物生物量和群落结构的主要生态因子。
Subjects: Psychology >> Social Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： User perspective taking is a critical way in which entrepreneurs can identify opportunities and cope with market competition. However, existing studies have ignored its modes, formation mechanism and impact on opportunity belief performance. Considering these issues, first, by introducing structural alignment theory and the attentional engagement model, we identify and deconstruct the modes of user perspective taking from the two perspectives of "the main characteristics of the thinking process" and "the immersion degree of user perspective taking", and these four modes are absorptive, inductive, heuristic and analytical user perspective taking. Second, based on the dual perspective of the “individual-user”, we refine the influencing factors of user perspective taking, which include user-related prior knowledge, flexible role orientation, cognitive complexity, and the uncertainty and fragmentation of user needs. Then, we analyze the positive effects of these factors on the formation of user perspective taking. Third, taking the formation speed and innovativeness of opportunity beliefs as performance indicators, we explain the impact of the modes of user perspective taking on opportunity belief formation performance. This research finds that absorptive and inductive user perspective taking have positive effects on opportunity belief formation speed, while heuristic and analytical user perspective taking have negative effects on opportunity belief formation speed. Moreover, inductive and analytical user perspective taking have positive effects on opportunity belief innovativeness, while absorption and heuristic user perspective taking have negative effects on opportunity belief innovativeness. Finally, we examine the moderating effects of cognitive management strategies involving adaptation to new information environments and the invocation of the entrepreneur’s own knowledge structure on the modes of user perspective taking and opportunity belief formation performance. This research finds that a cognitive management strategy that adapts to a new information environment strengthens the positive effects of absorptive and inductive user perspective taking on opportunity belief formation speed and weakens the negative effects of heuristic and analytical user perspective taking on opportunity belief formation speed. Moreover, a cognitive management strategy that adapts to a new information environment strengthens the positive effects of inductive and analytical user perspective taking on opportunity belief innovativeness, while the moderating effect of this type of strategy on the relationship between absorptive and heuristic user perspective taking and opportunity belief innovativeness is not significant. A cognitive management strategy that invokes the entrepreneur’s own knowledge structure weakens the negative effects of absorptive and heuristic user perspective taking on opportunity belief innovativeness and strengthens the positive effects of inductive and analytical user perspective taking on opportunity belief innovativeness, while the moderating effect of this type of strategy on the relationship between absorptive, heuristic, inductive and analytical user perspective taking and opportunity belief formation speed is not significant. This study enriches the understanding of user perspective taking and deeply explores the formation mechanism of user perspective taking and its impact on opportunity beliefs. The theoretical advancement of this research mainly relates to the following aspects. First, the identification and deconstruction of user perspective taking modes have certain reference significance for promoting the operational development of this vague concept. Second, the clarification of the influencing factors of user perspective taking lays a foundation for subsequent research on the antecedents of user perspective taking. Third, this study clarifies the impact of the modes of user perspective taking on opportunity belief formation performance and introduces two different cognitive management strategies that have certain enlightening significance regarding the cognitive process and the boundary conditions of user perspective taking. Moreover, it promotes the development of research related to user perspective taking and opportunity belief. Regarding the practical significance of this research, entrepreneurs can employ user perspective taking to form opportunity beliefs and identify opportunities. On the one hand, entrepreneurs should be good at distinguishing between the characteristics of different user perspective-taking modes and adopt appropriate user perspective-taking modes according to different conditions. On the other hand, entrepreneurs should actively control the user perspective-taking process and make rational use of two different cognitive management strategies to eliminate the negative impact of "cognitive imbalance".
Subjects: Management Science >> Other Disciplines of Management Science submitted time 2022-07-20
Abstract： User perspective taking is a critical way in which entrepreneurs can identify opportunities and cope with market competition. However, existing studies have ignored its modes, formation mechanism and impact on opportunity belief performance. Considering these issues, we deconstruct the modes of user perspective taking based on structural alignment theory and the attentional engagement model, and these modes include absorptive, inductive, heuristic and analytical user perspective taking. Then, from the dual perspective of the “individual-user”, we explore the positive effects of user-related prior knowledge, flexible role orientation, cognitive complexity, and the uncertainty and fragmentation of user needs on the formation of user perspective taking. Finally, taking the formation speed and innovativeness of opportunity beliefs as performance indicators, we explain the impact of the modes of user perspective taking on opportunity belief formation performance and examine the moderating effects of cognitive management strategies involving adaptation to new information environments and the invocation of the entrepreneur’s own knowledge structure on the modes of user perspective taking and opportunity belief formation performance. This study enriches the connotation of user perspective taking, extends the explanatory scope of structural alignment theory and the attentional engagement model, and provides a reference that can guide entrepreneurs to better identify opportunities by employing user perspective taking. It is of great significance for entrepreneurs to think about and understand users.
Peer Review Status:
Awaiting Review
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： Double-shell phase change nano-capsules were prepared by the emulsion interfacial polymerization method with phase change materials as core, polystyrene as inner shell, hydrophilic chitosan as outer shell, with a 1:1 ratio of core to shell, sodium dodecyl sulfate as emulsifier, hexadecane as co-emulsifier and azodiisobutyronitrile as initiator. The prepared capsules were characterized by fourier transform infrared (FT-IR), differential scanning calorimetry (DSC), scanning electron microscope (SEM), laser particle size analyzer (LPSA) etc. The results show that the morphology of the double-shell phase change nano-capsules was greatly influenced by the kind of cores, the amount of emulsifier, co-emulsifier and initiator, and also related to phacoemulsification time and mixing speed.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： The phase change materials of fatty acid/SiO2 composite were prepared by sol-gel method with SiO2 as carrier material, fatty acid as phase change material, absolute alcohol and deionized water as solvent, Which then were characterized by scanning electron microscope (SEM), laser particle size analyzer (LPSA), Fourier transform infrared (FT-IR), differential scanning calorimetry (DSC) etc. The effect of the type of cores, the amount of phase change material and absolute alcohol and deionized water as well as the solution pH value and ultrasonic wave power on the texture of the prepared composites were investigated systematically. The results show that the texture of the phase change materials of fatty acid/SiO2 composite was greatly influenced by the type of cores, the amount of phase change material and absolute alcohol and deionized water, and also related to solution pH value and ultrasonic wave power. The optimal processing parameters for preparation a good composite are: decanoic acid-palmitic acid acts as core, the mole ratio of decanoic acid-palmitic acid to tetraethyl orthosilicate is 0.4, the mole ratio of absolute alcohol to tetraethyl orthosilicate is 5, the mole ratio of deionized water to tetraethyl orthosilicate is 9, solution pH value is 4 and ultrasonic wave power is 200 W.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract： Optimization for Preparation of Phase Change and Humidity Control Composite Materials of Hexadecanol-Palmitic Acid-lauric Acid/SiO2
Subjects: Other Disciplines >> Synthetic discipline submitted time 2018-06-24 Cooperative journals: 《中国科学院院刊》
Abstract：精准扶贫是实现全面建成小康社会宏伟目标的根本途径。文章梳理了中国科学院亚热带农业生态研究所20多年来在广西环江县扶贫工作过程中历经的3个阶段，总结了环江县不同阶段“精准扶贫”模式的主要成效及社会影响，分析了新形势下该模式面临的挑战，探讨了科技助力环江县“精准脱贫”的新思路。
Subjects: Computer Science >> Computer Network submitted time 2016-11-02
Abstract：随着高性能计算需求的日益增加，片上众核（many-core）成为未来处理器结构的发展方向。目前，大多数众核处理器原型均采用分块的拓扑结构，通过片上网络相连。在面向通信密集型的应用时，片上网络的吞吐量（throughput）或者延迟（latency）通常成为制约系统性能的瓶颈。我们通过对片上数据存储和通信管理提供系统结构的支持，在众核处理器上实现了高效的片上数据通信。本文的主要贡献包括：（1）实现基于分块的众核处理器结构，支持程序可控的片上数据存储管理和数据传输管理；（2）提出异步数据块传输机制是一种容忍二维Mesh 片上网络延迟的有效方法。最后，我们在众核处理器上对快速傅立叶变换（FFT）进行了评估，在获得43.9Gflops 计算性能的同时，计算效率达到22.9%。
Peer Review Status:Awaiting Review
Subjects: Other Disciplines >> Synthetic discipline submitted time 2024-03-05 Cooperative journals: 《第八届海峡两岸暨港澳地区高校现代书院制教育论坛 》
Abstract：书院制的蓬勃发展为高等教育人才培养赋予了新的生命力，提供了新的可能性。近年来，在国家提倡“三全育人”，强调“五育并举”的大背景下，单一的书院或学院教育侧重已很难全面满足新时代对人才的需求，因此，必须加强两院协同育人以保证人才培养的质效。本文创造性地借助于韦恩图、平面二维直角坐标系以及集合映射等数学模型，从两院存在关系、两院育人效果、两院对应关系三方面来探讨构析两院之间的“协同”关系，结合实际工作问题，有针对性地给出了“优化两院议事机制”“健全两院沟通队伍”“理顺两院工作流程”“夯实两院工作举措”四方面的优化协同建议，对于新时期持续探索和做好两院协同育人工作具有一定的积极意义。
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》
Abstract： Microcapsules of phase change- and humidity- controlling material were synthesized by sol- gel method with hexadecanol- palmitic acid- lauric acid as core, SiO2 as shell and silaneas coupling agent. Then their performance of humidity controlling and temperature controlling, particle size distribution, composition and structure, surface morphology and thermal properties were characterized by isothermal sorption method, cooling curve measurement, laser particle analyzer (LPSA), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC) respectively. The results show that the amount of deionizedwater, absolute alcohol, hexadecanolpalmitic acid- lauric acid and silane coupling agent had great effect on the properties of the prepared phase change- and humidity-controlling materials. The phase change- and humidity-controlling material of good performance as spherical particles with smooth surface, homogeneous size distribution in a range of 1680.60~1735.35 nm and excellent dispersibility may be synthesized by the following optimal processing parameters: the mole ratio of deionized water totetraethyl orthosilicateis 9, the mole ratio of absolute alcohol totetraethyl orthosilicate 5, the mole ratio of hexadecanol-palmitic acid-lauric acid to tetraethyl orthosilicate 0.5, and the mole ratio of silane coupling agent totetraethyl orthosilicate 0.1.
Subjects: Astronomy >> Astrophysical processes submitted time 2019-11-13 Cooperative journals: 《天文研究与技术》
Abstract： 空间VLBI由于基线更长，在相同观测频率下，可获得比地基VLBI更高的分辨率。我国正在推进空间VLBI科学与技术研究。俄罗斯RadioAstron空间VLBI项目于2018年结束，其成功经验可资借鉴。该项目采用不同于常规地面VLBI的专用数据格式RDF（RadioAstron Data Format）记录观测数据，利用配备的星载或地面上行氢原子频标提供频率基准，数据经采集量化后传输至地面站，打上时标并记录于硬盘。为处理RadioAstron数据，本文分析了RDF格式，完成了RDF数据解码及VLBI相关处理，然后对比分析了Mark5B、VDIF等地面VLBI通用数据格式和RDF格式的特点。这些工作将为我国未来空间VLBI数据格式设计与处理积累经验。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract：通过密度泛函理论(DFT)对1,1,1,3一四氟丙烯(HFO-1234ze(Z),CF3CH}HF)的热解反应路径进行研究，对可能得热解产物(CF3H, CF4, HF)进行了分析。结果表明:在均裂反应中，CF:自由基最易生成，其活化能为210.25 kJ mol-1。相比之下，由于较高的活化能，F自由基最难产生。在随后的链式反应中，生成CF3H所需的活化能最低为64.23 kJ mol-1。而生成CF4和HF所需的活化能较高。本文从分子尺度研究了HFO-1234ze的热解机理并为研究有机工质的热稳定性提供了参考。
Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：传统学术期刊往往不够重视选题策划的意义和作用，常规工作中只着重于学术论文的整理和发布，缺乏将学术期刊做精、做热、做专、做成品牌的意识。【目的】为在专业性基础上提升特色性，通过选题策划将学术期刊在同质化模式中达成脱颖而出的传播效应，并将相应经验与其他学术期刊进行交流、互相借鉴。【方法】以国家政策导向为指引，以所在学科领域内的热点议题为切入角度，结合新媒体传播手段的探索与应用，构思并实践学术期刊选题策划的意识与习惯的建立。【结果】近些年，《海洋环境科学》围绕国家海洋工作政策重点和学科热点进行选题策划，产出多个取得良好社会效益的专刊、专栏产品，并因此受益，行业关注度、美誉度和影响因子等各项统计指标均有所提升。【结论】学术期刊应加强抓住政策热点和学科热点的能力，在实践中磨练选题策划能力，并探索通过新媒体技术手段打破传统出版形式的限制，从而提升期刊的品牌价值和学科影响力。
Subjects: Materials Science >> Materials Science (General) submitted time 2023-02-14 Cooperative journals: 《桂林电子科技大学学报》
Abstract： Lithium phosphorus oxynitride (LiPON) is the most representative thin-film solid-state electrolyte for the applications
of thin-film battery. It is also used as an interfacial protective layer to improve the interfacial stability of the electrolyte
with the positive and negative electrodes. The radio frequency magnetron sputtering was used to deposit Li3PO4 as the sputtering
target, and the solid electrolyte of lithium phosphorus oxynitride (LiPON) thin film was deposited under nitrogen atmosphere.
By optimizing the sputtering power, working pressure, substrate temperature and other process conditions, the
LiPON thin film with dense, uniform and defect-free surfaces was prepared. The XPS indicates that the sputtering process
of the thin film is a reactive sputtering process, and N replaced the bridge oxygen bond (—O—) and non-bridge oxygen
bond (O) in the Li3PO4 structure to reconstitute nitrogen three-coordinate bond Nt (—N) and nitrogen double-coordinate
bond Nd(N—) to form a LiPON film with a network structure. The room temperature ionic conductivity of the LiPON
thin film solid electrolyte was measured to be 7×10-7 S·cm-1, and the electronic conductivity was 4.8×10-13 S·cm-1.
The dense morphology and stable electrochemical performance of LiPON thin-film solid-state electrolytes have significant advantages
for the application of LiPON in thin-film batteries and interfacial modification of solid-state batteries.
Key words:LiPON; thin film solid electrolyte; RF magnetron sputtering; process optimization; thin film batter
Subjects: Medicine, Pharmacy >> Preventive Medicine and Hygienics submitted time 2024-06-20 Cooperative journals: 《中国全科医学》
MA Ning1 ，ZHAO Yang1*，LYU Shaobo1 ，ZHANG Haodong1 ，WANG Changming2 ，MENG Jie1
ZHAO Yang
LYU Shaobo
ZHANG Haodong
WANG Changming
MENG Jie
Abstract： Background The sleep characteristics of school-age children have a crucial impact on the development of emotional and behavioral problems. Sleep characteristics also play a role in the development of executive function in school#2;age children. There is a close relationship between the emergence of emotional and behavioral problems and the development of executive function in these children. Currently，there are few studies on the mediating effect of the relationship between sleep characteristics，executive function，and emotional and behavioral problems in school-age children. Objective To explore the relationship between sleep characteristics，executive function，and emotional and behavioral problems in school-age children，and to examine the mediating role of executive function in the relationship between sleep characteristics and emotional and behavioral problems. Methods From August 21 to October 8，2021，a convenience sampling method was used to select 516 school-age children from grades 1 to 6 in Xiwu Primary School and the Fourth Experimental Primary School in Shexian County，Handan City，Hebei Province. The Children's Sleep Habits Questionnaire（CSHQ），the Strengths and Difficulties Questionnaire（SDQ），and the Behavior Rating Inventory of Executive Function（BRIEF） were used to assess the sleep characteristics，emotional and behavioral problems，and executive function of the school-age children，respectively. Correlation analysis，regression analysis，and mediation analysis were conducted using SPSS 27.0 and the PROCESSv4.1 plugin. Results A total of 516 questionnaires were distributed，and 496 valid questionnaires were recovered，with an effective recovery rate of 96.1%. Correlation analysis showed that the total score of the CSHQ was negatively correlated with the Behavioral Regulation Index（BRI），Metacognition Index（MI），inhibition，shifting，emotional control，task initiation，working memory，planning，organization，and monitoring factors of the BRIEF（P<0.001）. The total score of the SDQ was positively correlated with the BRI，MI，inhibition，shifting，emotional control，task initiation，working memory，planning，organization，and monitoring factors of the BRIEF（P<0.001）. Forced entry method results showed that sleep characteristics negatively predicted emotional and behavioral problems（B=-0.15，t=-5.33，P<0.01），while executive function positively predicted emotional and behavioral problems（B=0.13，t=20.88，P<0.01）. Mediation analysis showed that when executive function，BRI，and MI were used as mediating variables，there was a complete mediating effect between sleep characteristics and emotional and behavioral problems in children. The 95% CI for both the main effect and the indirect effect did not include 0（P<0.001），and the 95% CI for the direct effect included 0（P>0.05）. Conclusion There is a close relationship between sleep characteristics，executive function，and emotional and behavioral problems in school-age children. Executive function has a complete mediating effect on the relationship between sleep characteristics and emotional and behavioral problems. This finding emphasizes the importance of good sleep for the behavioral and emotional well-being of school-age children and provides new perspectives and intervention approaches for enhancing executive function and overall development in school-age children.
Subjects: Biology >> Ecology submitted time 2018-04-14 Cooperative journals: 《生态学报》
Abstract：土壤氮素的可利用性是控制土壤微生物呼吸的重要因素之一，大量研究已经表明增加土壤活性氮的含量可以降低微生物呼吸，但是土壤氮输入对土壤微生物呼吸温度敏感性的影响还不清楚。以青藏高原高寒草甸为研究对象，通过野外施氮试验和室内控制试验相结合的方式，在5℃、15℃和25℃条件下对3种施氮水平的土壤（对照，0g N m-2 a-1；低氮，5g N m-2 a-1；高氮，15g N m-2 a-1）进行培养，探讨土壤微生物呼吸及其温度敏感性对不同氮添加水平的响应情况。结果表明：（1）3个温度培养下的土壤微生物呼吸速率和累积碳释放量均随施氮量的增加而显著降低（P P P P < 0.05）。结果表明，在全球气候变暖的背景下，土壤氮输入将增加预测青藏高原高寒草甸地区土壤碳排放的不确定性。
Subjects: Astronomy >> Astrophysical processes submitted time 2023-12-06 Cooperative journals: 《天文研究与技术》
Abstract： In response to the requirements of high sampling rate, wide bandwidth, multi-channel amplitude-phase consistency as well as high-speed direct sampling and time-domain data storage in current radio observation devices, this paper investigates and analyzes the technical architecture and functionalities of digital processing systems in multiple radio observation devices. It proposes a 4-channel digital receiver system based on ZYNQ SOC and core components such as ADS54J60. This system achieves a maximum sampling rate of 1GSPS per single channel, demonstrating flexibility and scalability, which allows for the addition of expansion cards to increase sampling channels for meeting the fundamental requirements of future large-scale expandable radio interference arrays. The system consists of three parts: a high-speed data acquisition card, an optical communication receiving card, and a server. Currently, the high-speed serial interface technology based on SerDes has achieved direct sampling with a quantization accuracy of 16 bits and a sampling rate of 300 MSPS, providing a full-scale signal-to-noise ratio of 60 dB, a 40 Gbps SFP+ data transmission bandwidth, and a 1.5 GB/ s PCIe communication bandwidth. It can capture analog signals in the intermediate frequency range of 4.5 MHz to 150 MHz. The system has completed both hardware and software design and testing. In our tests, we sampled a 10 MHz sine wave signal with an amplitude of 125 mV, and the amplitude difference between the 4 channels was less than 1 mV, with a phase delay of less than 3.3 ns. The system integrates programmable SFP+ communication interfaces and a multi-machine synchronization mechanism to accommodate the synchronous acquisition needs of multi-element arrays. It can also store the data of the original radio signals, providing more detailed time-domain data for radio research.
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2018-01-02 Cooperative journals: 《工程热物理学报》
Abstract： The reaction pathways of thermal decomposition of 1,1,1,3-tetrafluoro-1-propene（HFO-1234ze(Z), CF3CH=CHF）werepresented to investigate the formation mechanism of some possible products(CF3H, CF4, HF) by using density function theory (DFT)simulations. The results point out that CF3 is the most preferred product in homolytic cleavage reaction with the lowest energy barrier of210.25 kJ/mol. F radical is hard to be generated during thermal decomposition processes because of its higher energy barrier. Insubsequent radical attacking chain reactions, a lower energy barrier (64.23 kJ/mol) is required to form CF3H. CF4 and HF will begenerated with higher energy barriers. Our work presents the mechanism of thermal decomposition of HFO-1234ze from a moleculelevel and provides a reference for studying the thermal stability of organic working fluids.
Subjects: Biology >> Zoology submitted time 2017-11-08 Cooperative journals: 《动物营养学报》
Abstract：本研究采取比较屠宰法测定20~35 kg杜泊羊×湖羊（杜湖）F1代公羔代常量元素[钙（Ca）、磷（P）、钾（K）、钠（Na）和镁（Mg）]的维持和生长需要量。选择35只杜湖F1代公羔[初体重为（19.20±0.36） kg]作为试验动物。随机选取7只羊，体重达约20 kg时进行屠宰以测定羊体常量元素含量的初始值。再随机选取7只羊，饲喂全混合颗粒饲粮，自由采食（AL），体重达约28 kg时进行屠宰。剩余的21只羊随机分为3个组，分别为AL组、70%AL组和40%AL组，每组7只羊。当AL组体重大约为35 kg时，这3组将被屠宰。屠宰后，测定空腹体（头+足、皮、内脏+血液和胴体）常量元素含量。结果表明：在20~35 kg体重阶段，杜湖F1代公羔的钙、磷、钾、钠和镁维持需要量[空腹体重（EBW）为基础]分别为24.01、11.70、3.20、6.60、1.20 mg/kg EBW，生长需要量[空腹体增重(EBWG)为基础]分别为11.55~11.41 g/kg EBWG、5.82~5.77 g/kg EBWG、1.47~1.69 g/kg EBWG、0.42~0.44 g/kg EBWG和0.98~0.88 g/kg EBWG。总之，20~35 kg杜湖F1代常量元素需要量的确定将有助于此生长阶段合理饲粮的配制，有利于羔羊生长性能的提高。
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