检索结果-南通市图书馆

Effects of water and salt coordinated regulation at the different growth stages on water consumption and yield of tomato

引用

International Journal of Agricultural and Biological Engineering 2021年第4期14卷 96-105页

作者： Weihua Wang Yidan gong Faculty of Agriculture and Food Kunming University of Science and TechnologyKunming 650500China

The objective of this study was to explore the effects of different degrees of water and salt stress on the actual water consumption and soil salt accumulation of tomatoes and the salt tolerance characteristics of tomatoes under brackish water combined with regulated deficit irrigation *** greenhouse pot experiment was used to set three influencing factors,the irrigation water salinity S1 was 1.1 g/l(local shallow groundwater),S2 was 2.0 g/l,and S3 was 4.0 g/l,respectively,and different degrees of water deficit(W1 ranged from 65%-75%Field Capacity(FC),W2 ranged from 55%-65%FC,W3 ranged from 45%-55%FC)and seedling stage(T1),blossoming and bearing fruits stage(T2)and mature picking stage(T3).The response of fresh fruit weight,stems and leaves weight,yield and water use efficiency of tomato under water and salt stress were monitored and *** results showed the coordinated regulation of water and salt can significantly reduce the electrical conductivity of the 0-30 cm soil of the tomato root *** higher the salinity of irrigation water,the better the salt control effects of the coordinated regulation of water and salt;the coordinated regulation of water and salt at different growth stages had significant effects on the weight of fresh tomato fruits,the weight of stems and leaves and the *** salinity of irrigation water was in inverse proportion to the yield of tomatoes;In S1 treatment irrigation(irrigation water salinity was 1.1 g/l)under the mildly regulated deficit in the seedling stage(irrigation water was 55%-65%of the field water capacity)can effectively reduce the irrigation water volume during the whole growth stage while ensuring that there was no significant reduction in *** research results provided a scientific and reliable theoretical basis for the increase of local tomato production,the improvement of water use efficiency and the formulation of suitable irrigation patterns.

关键词： tomato coordinated regulation of water and salt soil electrical conductivity water consumption yield

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Coping with the Bullwhip Effect Using Inventory or Cash: An Environment-Behavior-Performance Paradigm

引用

Journal of Systems Science and Systems Engineering 2021年第2期30卷 215-235页

作者： Baile lu Qihui gong Baofeng Huo Weihua Zhou School of management Zhejiang UniversityHangzhou 310058China

The bullwhip effect is w idely found in business and exerts adverse effects on business *** investigate the influence of the bullwhip effect on firm s'performance and their responses,this study proposed an environment-behavior-performance analysis fram ework and offered a new perspective for studying the bullwhip *** data collected from 1,734 listed manufacturers in China from 2002 to 2017,we adopted regression models to test the proposed m odel and conducted a series of robustness *** find that the bullwhip effect is positively related to operating risk,inventory,and cash holdings,and the moderate levels of inventory and cash are negatively associated with operating ***,inventory and cash play different roles and work together to alleviate operating risk induced by the bullwhip ***,excess resource holdings are positively associated with operating ***,firm swith different levels of resources should hold suitable levels of inventory,cash,or both as contingent responses to the bullwhip effect.

关键词： Bullwhip effect inventory holding cash holding operating risk

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Compact,efficient diode-end-pumped Nd:GdVO_4 slab continuous-wave 912-nm laser

引用

Chinese Physics B 2012年第2期21卷 333-337页

作者： liu Huan gong ma-li State Key laboratory of Tribology Center for Photonics and ElectronicsDepartment of Precision Instruments and MechanologyTsinghua UniversityBeijing 100084China

A fiber-coupled laser-diode （lD） end-pumped Nd：GdVO4 slab continuous-wave （CW） 912-nm laser and an lD bar end-pumped Nd：GdVO4 slab CW 912-nm laser are both demonstrated in this paper. Using the fiber-coupled lD of end-pumped type, a highest CW 912-nm laser output power of 10.17 W is obtained with a high optical to-optical conversion efficiency of 24.6% and a slope efficiency of 34.5%. The measured m2 factors of beam quality in x and y directions are 5.3 and 5.1, respectively. Besides, an lD bar of end-pumped type is used to realize CW 912-nm laser output, which has the advantages of compactness and low cost. When the pump power is 38.8 W, the output power is 8.87 W and the measured m^2 factors of beam quality in x and y directions are 16 and 1.31, respectively. In order to improve the beam quality of the 912-nm laser at x direction, a new quasi-concentric laser resonator will be designed, and an lD bar end-pumped Nd：GdVO4 slab high-power CW 912-nm TEm00 laser will be realized in the future.

关键词： diode-end-pumped Nd:GdVO4 slab lD bar 912-nm laser

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Concept of radial slippage propagation triggering self-loosening and optimisation design of novel anti-loosening structures

引用

Friction 2023年第6期11卷 865-880页

作者： Hao gong Jianhua lIU Huihua FENG Jiayu HUANG Beijing Institute of Technology School of Mechanical EngineeringBeijing100081China

Self-loosening of bolted joints can occur in a vibration environment,and it may induce bolt fatigue fracture with catastrophic *** is essential to clarify the self-loosening mechanism,based on which novel anti-loosening thread structures can be *** this paper,we propose the concept of radial slippage propagation and provide new insights into the self-loosening *** new theory states that the slippage along the radial direction of the thread surface induces more slippage areas(slippage propagation),and self-loosening occurs due to the dynamic evolution and propagation of contact states on the thread and bearing surfaces with an increase in the number of vibration *** element analysis(FEA)was used to validate the propagation process of slippage areas on the thread surface.A novel bolted joint with step thread engagement was developed,which could prevent the occurrence of relative motion of the external and internal threads in the radial direction and thus block slippage propagation.A three-dimensional(3D)finite element model(FEm)of the novel thread structure was established,and a test specimen was manufactured using two special *** and experiments validated its superior anti-loosening and anti-fatigue performances,and the convenience of installation and *** validation of the radial slippage propagation theory and the performance optimisation of the step-thread structure should be performed in the future.

关键词： bolted joint self-loosening slippage propagation step thread transversal vibration

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高精度地震勘探采集技术探讨

引用

石油地球物理勘探 2005年第3期40卷 261-266页

作者：吕公河西安交通大学建力学院

针对目前高精度地震勘探采集中存在的问题,本文重点从激发、接收、噪声和覆盖次数等方面进行了分析探讨。提出了一些新的认识和建议:①激发耦合问题不要过分强调炸药爆速,要分析围岩介质的特性;②激发井深要从定性的确定方法提高到定量... 详细信息

针对目前高精度地震勘探采集中存在的问题,本文重点从激发、接收、噪声和覆盖次数等方面进行了分析探讨。提出了一些新的认识和建议:①激发耦合问题不要过分强调炸药爆速,要分析围岩介质的特性;②激发井深要从定性的确定方法提高到定量的方法上来;③慎用自然频率较高的检波器,它不仅从根本上丢失了低频段的地震信号,同时对高频信号没有任何改善,反而较大程度地改造了地震信号;④检波器置于井中接收的做法使接收环境和波场变得复杂,最好还是将检波器近地表埋实即可;⑤检波器集中组装、单点接收的做法降低了耦合谐振频率,失去了一次压噪机会,既不利于提高分辨率,又不利于提高信噪比;⑥小面积组合可以有针对性地压制高频段噪声,拓宽优势频带;⑦覆盖次数的选择既要考虑信噪比又要考虑分辨率,同时还要考虑经济效益,在三者之间求平衡。

关键词：地震勘探高精度技术探讨采集覆盖次数地震信号检波器耦合问题激发井深自然频率高频信号谐振频率高分辨率高信噪比优势频带经济效益接收低频段近地表高频段集中噪声波场

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inclusion of the tunneling phase shift for interferometric particle imaging for bubble sizing

引用

Particuology 2021年第1期19卷 50-57页

作者： Xiang liu Jianqi Shen Peng gong Haitao Yu College of Science University of Shanghai for Science and TechnologyShanghai 200093China

The interferometric particle imaging technique makes use of the angular oscillations of the scattered light in the forward direction for droplet or bubble *** out-of-focus image consists of fringes,the spacing of which reflects the interference between the surface-reflected light and the twofold-refracted *** internal reflection occurs when the incident light hits the bubble at a large incident *** tunneling phase shift is not included in the geometric optics approximation,which leads to a deviation from mie *** this work,we modified the formula for describing the fringe spacing by including the tunneling phase shift of total internal *** analysis and experiments showed that the modification is effective for the measurement of bubbles smaller than 60μm.

关键词： Interferometric particle imaging Bubbles Total internal reflection Tunneling phase shift

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

THE BAND STRUCTURE AND WORK FUNCTION OF TRANSPARENT CONDUCTING AlUmINUm AND mANGANESE CO-DOPED ZINC OXIDE FIlmS

引用

Acta metallurgica Sinica(English letters) 2005年第3期18卷 356-362页

作者： H.T.Cao Z.l.Pei X.B.Zhang J.gong C.Sun l.S.Wen DivisionofSurfaceEngineeringofmaterials InstituteofMetalResearchTheChineseAcademyofSciencesShenyang110016China DivisionofSurfaceEngineeringofmaterials InstituteofMetalResearchTheChineseAcademyofSciencesShenyang110016China／／ShenyangResearchCenterforInterfacialMaterialsShenyang110016China

Al and mn co-doped-ZnO films have been prepared at room temperature by DC reacti ve magnetron sputtering technique. The optical absorption coefficient, apparent and fundamental band gap, and work function of the films have been investigated using optical spectroscopy, band structure analyses and ultraviolet photoelectro n spectroscopy (UPS). ZnO films have direct allowed transition band structure, w hich has been confirmed by the character of the optical absorption coefficient. The apparent band gap has been found directly proportional to N2/3, showing that the effect of Burstein-moss shift on the band gap variations dominates over the many-body effect. With only standard cleaning protocols, the work function of ZnO: (Al, mn) and ZnO: Al films have been measured to be 4.26 and 4.21eV, respec tively. The incorporation of mn element into the matrix of ZnO, as a relatively deep donor, can remove some electrons from the conduction band and deplete the d ensity of occupied states at the Fermi energy, which causes a loss in measured p hotoemission intensity and an increase in the surface work function. Based on th e band gap and work function results, the energy band diagram of the ZnO: (Al, m n) film near its surface is also given.

关键词： transparent conducting oxide film band gap UPS work function

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Kachchh (India) earthquake 2001——causes,severity and impact on groundwater resources

引用

Journal of Environmental Sciences 2003年第4期15卷 500-505页

作者： m.A.Khan m.l.Sharma CentralAridZoneResearchInstitute CentralAridZoneResearchInstitute Jodhpur342003IndiaJodhpur342003India

Earthquake 2001 in Bhuj region of Kachchh district of Gujarat(India) was one of the most devastating earthquakes in the Indian history. This earthquake has caused severe damage to human life and properties. The impact of earthquake on groundwater resources at many locations was significant. Steep rise in static water level due to earthquake was observed at Bhachau and Chandarani. At other location groundwater followed the declining trend.

关键词： earthquake geology groundwater Bhuj, Kachchh

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On calculating glacial isostatic adjustment

引用

Geodesy and Geodynamics 2024年第5期15卷 441-452页

作者： l.m.Cathles Cornell University IthacaNY 14853USA

modeling the earth's fluid and elastic response to the melting of the glaciers of the last ice age is the most direct way to infer the earth's radial viscosity ***,we compare two methods for calculating the viscoelastic response to surface *** one,the elastic equation of motion is converted to a viscoelastic equation using the Correspondence *** the other,elastic deformation is added to the viscous flow as isostatic adjustment *** two modeling methods predict adjustment histories that are different enough to potentially impact the interpretation of the observed glacial isostatic adjustment(GIA).The differences arise from buoyancy and whether fluid displacements are subjected to hydrostatic *** methods agree if they use the same equations and boundary *** origin of the differences is determined by varying the boundary conditions and pre-stress application.

关键词： Glacial isostatic adjustment Viscoelastic normal modes Hydrostatic pre-stress Elastic buoyancy Correspondence principle

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enhancement of spike coherence by the departure from Gaussian noise in a Hodgkin-Huxley neuron

引用

Science China Chemistry 2009年第8期52卷 1186-1191页

作者： XIE YanHang gong YuBing HAO YingHang School of Physics&Electronic Engineering Ludong UniversityYantai 264025China

Experimental study has shown that non-Gaussian noise exists in sensory systems like *** departure from Gaussian behavior is a characteristic parameter of non-Gaussian *** this paper,we have numerically studied the effect of a particular kind of non-Gaussian colored noise(NGN),especially its departure q from Gaussian noise(q = 1),on the spiking activity in a deterministic Hodgkin-Huxley(HH) neuron driven by sub-threshold periodic *** results show that the departure q can affect the spiking activity induced by noise intensity *** smaller q values,the minimum in the variation coefficient(CV) as a function of noise intensity(D) becomes smaller,showing that D-induced stochastic resonance(SR) becomes ***,depending on the value of D,q can either enhance or reduce the spiking ***,CV changes non-monotonously with varying q and passes through a minimum at an intermediate q,representing the presence of "departure-induced SR".This result shows that appropriate departures of the NGN can enhance the spike coherence in the HH *** the departure of the NGN determines the probability distribution and hence may denote the type of the noise,"departure-induced SR" shows that different types of noise can enhance the spike coherence,and hence may improve the timing precision of sub-threshold signal encoding in the HH neuron.

关键词： neuron non-Gaussian colored noise spike coherence stochastic resonance stochastic dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：