[Objective] The devlopmental stratagies for modern agricultural logistics industry in Xi’an were studied based on system dynamics.[Method] By dint of system dynamics,reality analysis and relevant data were applied to...[Objective] The devlopmental stratagies for modern agricultural logistics industry in Xi’an were studied based on system dynamics.[Method] By dint of system dynamics,reality analysis and relevant data were applied to support the exploration of each factor for the development of modern agricultural logistics industry.In the meantime,according to the concrete data,the systematic dynamics model was set up based on the third party logistics and Xi’an agricultural economy cooperation.In addition,each influencing factor was expounded.[Result] The agricultural production,logistics requirement and logistics supply in Xi’an City were increasing;the idea of reducing the cost through improving agricultural logistics requirement was not ideal;the increasing input to agricultural logistics can reduce cost and can promote the development of economy;the third party increasing investment can reduce cost and accelerate economic development.[Conclusion] It provided theoretical basis for the adjustment of economic structure.展开更多
Since 1992 the author has led research group in Xi'an Jiaotong University to investigate and develop micro-electro mechanical systems(MEMS) sensors,including pressure sensor,acceleration sensor,gas sensor,viscosit...Since 1992 the author has led research group in Xi'an Jiaotong University to investigate and develop micro-electro mechanical systems(MEMS) sensors,including pressure sensor,acceleration sensor,gas sensor,viscosity & density sensor,polymerase chain reaction(PCR) chip and integrated sensor etc.This paper introduces the technologies and research results related to MEMS sensors we achieved in the last 20 years.展开更多
Fourteen stream segments were investigated throughout the Xin’an Spring in Shanxi Province, China in 2004. The variation ranges in stream size, current velocity, discharge, dissolved oxygen, and specific conductance ...Fourteen stream segments were investigated throughout the Xin’an Spring in Shanxi Province, China in 2004. The variation ranges in stream size, current velocity, discharge, dissolved oxygen, and specific conductance were large. Twenty-two macroalgae species were found in the stream. Major divisions in terms of species numbers were Chlorophyta (59.1%), Cyanophyta (22.8%), Xanthophyta (9.1%), Rhodophyta (4.5%) and Charophyta (4.5%). The most widespread species, Cladophora rivularis (50.0%), also Oedogonium sp. (42.9%) and Spirogyra sp. (42.9%) were well represented throughout the stream, whereas another 10 species were found in only one sampling site. Total percentage cover varied from <1% to 90%. Red algae Batrachospermum acuatum and the charophytes Chara vulgaris have the highest percentage cover. Among the parameters analyzed, the stream width, specific conductance and dissolved oxygen were the ones that more closely related to the species number and percentage cover of macroalgal communities. The species number of each site was negatively correlated with dissolved oxygen content. The total percentage cover of the macroalgae was negatively correlated with the stream width and the specific conductance.展开更多
Additive manufacturing technology has been developed in Xi' an Jiaotong University for almost 20 years. Up to now~ it is still attracting the attentions of the researchers or manufacturers all over the world. Some in...Additive manufacturing technology has been developed in Xi' an Jiaotong University for almost 20 years. Up to now~ it is still attracting the attentions of the researchers or manufacturers all over the world. Some in- novative processes and frontier application research are all being conducted here to catch up with the new develop- ment of this technology. In the paper, newly developed processes, such as ultraviolet-light emitting diode (UV- LED) stereolithography, ceramic stereolithography, and direct metal forming, were described. Some results of the frontier application researches, such as indirect fabrication of ceramic casting mould, wind-tunnel-testing models, photonic crystals and metamatcrials, were also briefly reviewed.展开更多
This paper focuses on the female English teachers' work-related stress in the School of Foreign Languages, Xi'an Jiaotong University. A survey produced some results that are worth studying. The teachers in this spec...This paper focuses on the female English teachers' work-related stress in the School of Foreign Languages, Xi'an Jiaotong University. A survey produced some results that are worth studying. The teachers in this special group are keeping their heavy-burdened teaching job by finding ways to escape their work-related stress and at the same time trying to save face. Answers to the questionnaire have proved that Chinese cultural characteristics have been deeply rooted in the SFL teaching staff even though they have accepted and learned western culture over a period of many years.展开更多
In the teaching of course Management Science, how to effectively make use of network teaching platform is a very important reform. How will be the best effect achieved? On the basis of the network teaching platform s...In the teaching of course Management Science, how to effectively make use of network teaching platform is a very important reform. How will be the best effect achieved? On the basis of the network teaching platform system available from Xi' an International University and also by combining with the teaching situation of course Management Science, the existing problems are analyzed and also the related suggestions are proposed, in order to achieve a better teaching effect.展开更多
Scalenus syndrome is a kind of thoracicoutlet syndrome. I treated 16 such cases withmassage in combination with acupointinjection from 1989-1996. The results weresatisfactory and introduced as follows.
Water comes from various different sources, such as lakes, rivers, streams, springs and boreholes. Depending on the quality of its source, water will almost certainly have to be treated to make it safe to drink. All w...Water comes from various different sources, such as lakes, rivers, streams, springs and boreholes. Depending on the quality of its source, water will almost certainly have to be treated to make it safe to drink. All water supplies for human consumption must be well stored, free from micro-organisms, parasites and any substances that endanger public health if found in sufficient numbers or concentrations, in the same time. In our continued effort for a better result in our study of qualitative aspects, by physicochemical and bacteriological analysis, the authors focus in two crucial questions: a) is the water quality of Sidi-bel-Abbes good or bad ,and well stored? b) is the people of Sidi-bel-Abbes are aware of the importance of water and knowledgeable about how to use this vital? This study is the first to use data from I real work based upon a developed method and a good investigation to know exactly if water of Sidi-Bel-Abbes is safely treated, well stored and consumed in resemble way. In first, the authors plotted the method in analysing the qualitative aspect of water using developed material for a precise result starting by the distribution connection (condition and management) and the verification of water tank storage and finishing by analyzing the all the aspect of water (physicochemical and bacteriological analysis). In second, the authors focus on the way that people of Sidi Bel Abbes used and consumption water by introducing a targeted method (questionnaires) which help us a lot to know precisely the way, time and the real quantity of water consumed daily. In final step of our study of qualitative aspects, by physico-chemical and bacteriological, and environmental analyses, investigation processed by PCA (principal component analysis) of the drinking water supplied to Sidi Bel Abbes city (Algeria north-west) concluded by an encouraging result, that despite the various constraints faced by the departments concerned, they ensure the supply of safe drinking water in households almost daily.展开更多
The paleosol samples from the fifth layer of the loess profile at Renjiapo in the eastern suburb of Xi'an are observed and analyzed using electron microscope and energy spectrum. Minerals such as AgSO4 and molybde...The paleosol samples from the fifth layer of the loess profile at Renjiapo in the eastern suburb of Xi'an are observed and analyzed using electron microscope and energy spectrum. Minerals such as AgSO4 and molybdenum, which are rare to find and can indicate typical dry climate environment, are found in this layer of paleosol. Secondary mineral is usually granular form of ellipsoidal and crystallization, and has the characteristics of chemical precipitating crystallization of apertures and fracture. Molybdenum minerals have the characteristics of colloidal substances. There are two kinds of secondary minerals. One is silver sulfate mineral and the other is silver oxide mineral. The movement of secondary silver, molybdenum and cobalt minerals, new clay mineral, Fe2O3 and Al2O3 indicates that S5 has experienced strong chemical weathering and mineral dissolution during its development. Silver, molybdenum, and cobalt can be released from primary minerals. During that period, the precipitation was abundant in Xi'an where soil reached an acidity stage of chemical weathering. At the later development stage of paleosol in the lowest part of S5, warm and wet monsoon climate had changed to dry and non-monsoon climate. In the period of the formation of AgSO4, which is easier to dissolve than CaSO4, a dry and non-monsoon climate was present in the Guanzhong Plain. Strong evaporation resulted in the accumulation of SO42-in the soil water solution and the formation of AgSO4. At that time, summer monsoon of East Asia was weak and did not cross Qinling Mountains to reach Guanzhong Plain. And at that time, the precipitation in Xi'an was less than 300 mm, and it was drier then in Xi'an than at present in Lanzhou.展开更多
文摘[Objective] The devlopmental stratagies for modern agricultural logistics industry in Xi’an were studied based on system dynamics.[Method] By dint of system dynamics,reality analysis and relevant data were applied to support the exploration of each factor for the development of modern agricultural logistics industry.In the meantime,according to the concrete data,the systematic dynamics model was set up based on the third party logistics and Xi’an agricultural economy cooperation.In addition,each influencing factor was expounded.[Result] The agricultural production,logistics requirement and logistics supply in Xi’an City were increasing;the idea of reducing the cost through improving agricultural logistics requirement was not ideal;the increasing input to agricultural logistics can reduce cost and can promote the development of economy;the third party increasing investment can reduce cost and accelerate economic development.[Conclusion] It provided theoretical basis for the adjustment of economic structure.
文摘Since 1992 the author has led research group in Xi'an Jiaotong University to investigate and develop micro-electro mechanical systems(MEMS) sensors,including pressure sensor,acceleration sensor,gas sensor,viscosity & density sensor,polymerase chain reaction(PCR) chip and integrated sensor etc.This paper introduces the technologies and research results related to MEMS sensors we achieved in the last 20 years.
基金Supported by the National Nature Science Foundation of China (No. 30470118 and 30270119)the Nature Science Foundation of Shanxi Province, China (No. 20021079).
文摘Fourteen stream segments were investigated throughout the Xin’an Spring in Shanxi Province, China in 2004. The variation ranges in stream size, current velocity, discharge, dissolved oxygen, and specific conductance were large. Twenty-two macroalgae species were found in the stream. Major divisions in terms of species numbers were Chlorophyta (59.1%), Cyanophyta (22.8%), Xanthophyta (9.1%), Rhodophyta (4.5%) and Charophyta (4.5%). The most widespread species, Cladophora rivularis (50.0%), also Oedogonium sp. (42.9%) and Spirogyra sp. (42.9%) were well represented throughout the stream, whereas another 10 species were found in only one sampling site. Total percentage cover varied from <1% to 90%. Red algae Batrachospermum acuatum and the charophytes Chara vulgaris have the highest percentage cover. Among the parameters analyzed, the stream width, specific conductance and dissolved oxygen were the ones that more closely related to the species number and percentage cover of macroalgal communities. The species number of each site was negatively correlated with dissolved oxygen content. The total percentage cover of the macroalgae was negatively correlated with the stream width and the specific conductance.
文摘Additive manufacturing technology has been developed in Xi' an Jiaotong University for almost 20 years. Up to now~ it is still attracting the attentions of the researchers or manufacturers all over the world. Some in- novative processes and frontier application research are all being conducted here to catch up with the new develop- ment of this technology. In the paper, newly developed processes, such as ultraviolet-light emitting diode (UV- LED) stereolithography, ceramic stereolithography, and direct metal forming, were described. Some results of the frontier application researches, such as indirect fabrication of ceramic casting mould, wind-tunnel-testing models, photonic crystals and metamatcrials, were also briefly reviewed.
文摘This paper focuses on the female English teachers' work-related stress in the School of Foreign Languages, Xi'an Jiaotong University. A survey produced some results that are worth studying. The teachers in this special group are keeping their heavy-burdened teaching job by finding ways to escape their work-related stress and at the same time trying to save face. Answers to the questionnaire have proved that Chinese cultural characteristics have been deeply rooted in the SFL teaching staff even though they have accepted and learned western culture over a period of many years.
文摘In the teaching of course Management Science, how to effectively make use of network teaching platform is a very important reform. How will be the best effect achieved? On the basis of the network teaching platform system available from Xi' an International University and also by combining with the teaching situation of course Management Science, the existing problems are analyzed and also the related suggestions are proposed, in order to achieve a better teaching effect.
文摘Scalenus syndrome is a kind of thoracicoutlet syndrome. I treated 16 such cases withmassage in combination with acupointinjection from 1989-1996. The results weresatisfactory and introduced as follows.
文摘Water comes from various different sources, such as lakes, rivers, streams, springs and boreholes. Depending on the quality of its source, water will almost certainly have to be treated to make it safe to drink. All water supplies for human consumption must be well stored, free from micro-organisms, parasites and any substances that endanger public health if found in sufficient numbers or concentrations, in the same time. In our continued effort for a better result in our study of qualitative aspects, by physicochemical and bacteriological analysis, the authors focus in two crucial questions: a) is the water quality of Sidi-bel-Abbes good or bad ,and well stored? b) is the people of Sidi-bel-Abbes are aware of the importance of water and knowledgeable about how to use this vital? This study is the first to use data from I real work based upon a developed method and a good investigation to know exactly if water of Sidi-Bel-Abbes is safely treated, well stored and consumed in resemble way. In first, the authors plotted the method in analysing the qualitative aspect of water using developed material for a precise result starting by the distribution connection (condition and management) and the verification of water tank storage and finishing by analyzing the all the aspect of water (physicochemical and bacteriological analysis). In second, the authors focus on the way that people of Sidi Bel Abbes used and consumption water by introducing a targeted method (questionnaires) which help us a lot to know precisely the way, time and the real quantity of water consumed daily. In final step of our study of qualitative aspects, by physico-chemical and bacteriological, and environmental analyses, investigation processed by PCA (principal component analysis) of the drinking water supplied to Sidi Bel Abbes city (Algeria north-west) concluded by an encouraging result, that despite the various constraints faced by the departments concerned, they ensure the supply of safe drinking water in households almost daily.
基金supported by National Natural Science Foundation of China(Grant No. 40672108)State Key Laboratory of Chinese Academy of Sciences (Grant No. SKLLQG0916)
文摘The paleosol samples from the fifth layer of the loess profile at Renjiapo in the eastern suburb of Xi'an are observed and analyzed using electron microscope and energy spectrum. Minerals such as AgSO4 and molybdenum, which are rare to find and can indicate typical dry climate environment, are found in this layer of paleosol. Secondary mineral is usually granular form of ellipsoidal and crystallization, and has the characteristics of chemical precipitating crystallization of apertures and fracture. Molybdenum minerals have the characteristics of colloidal substances. There are two kinds of secondary minerals. One is silver sulfate mineral and the other is silver oxide mineral. The movement of secondary silver, molybdenum and cobalt minerals, new clay mineral, Fe2O3 and Al2O3 indicates that S5 has experienced strong chemical weathering and mineral dissolution during its development. Silver, molybdenum, and cobalt can be released from primary minerals. During that period, the precipitation was abundant in Xi'an where soil reached an acidity stage of chemical weathering. At the later development stage of paleosol in the lowest part of S5, warm and wet monsoon climate had changed to dry and non-monsoon climate. In the period of the formation of AgSO4, which is easier to dissolve than CaSO4, a dry and non-monsoon climate was present in the Guanzhong Plain. Strong evaporation resulted in the accumulation of SO42-in the soil water solution and the formation of AgSO4. At that time, summer monsoon of East Asia was weak and did not cross Qinling Mountains to reach Guanzhong Plain. And at that time, the precipitation in Xi'an was less than 300 mm, and it was drier then in Xi'an than at present in Lanzhou.