The systematism of weapon combat is the typical characteristic of a modern battlefield. The process of combat is complex and the demand description of weapon system of systems (SOS) is difficult. Granular analyzing ...The systematism of weapon combat is the typical characteristic of a modern battlefield. The process of combat is complex and the demand description of weapon system of systems (SOS) is difficult. Granular analyzing is an important method for solving the complex problem in the world. Granular thinking is introduced into the demand description of weapon SoS. Granular computing and granular combination based on a relation of compatibility is proposed. Based on the level of degree and degree of detail, the granular resolution of weapon SoS is defined and an example is illustrated at the end.展开更多
We fabricated wearable perspiration analyzing sites for actively monitoring physiological status during exercises without any batteries or other power supply.The device mainly consists of ZnO nanowire(NW)arrays and fl...We fabricated wearable perspiration analyzing sites for actively monitoring physiological status during exercises without any batteries or other power supply.The device mainly consists of ZnO nanowire(NW)arrays and flexible polydimethylsiloxane substrate.Sweat on the skin can flow into the flow channels of the device through capillary action and flow along the channels to ZnO NWs.The sweat flowing on the NWs(with lactate oxidase modification)can output a DC electrical signal,and the outputting voltage is dependent on the lactate concentration in the sweat as the biosensing signal.ZnO NWs generate electric double layer(EDL)in sweat,which causes a potential difference between the upper and lower ends(hydrovoltaic effect).The product of the enzymatic reaction can adjust the EDL and influence the output.This device can be integrated with wireless transmitter and may have potential application in constructing sports big data.This work promotes the development of next generation of biosensors and expands the scope of self-powered physiological monitoring system.展开更多
Metallic flaky sendust particles are prepared for use as fillers in electromagnetic attenuation composites. We report the interface reflection model to divide the broad bandwidth into electromagnetic loss and quarter-...Metallic flaky sendust particles are prepared for use as fillers in electromagnetic attenuation composites. We report the interface reflection model to divide the broad bandwidth into electromagnetic loss and quarter-wavelength (λ/4) cancelation. Combining with the face reflection calculation, we identify the electromagnetic loss originated from skin effect, which is used to explain over half of the absorbed energy in high frequency band. Most impor- tantly, the unique electromagnetic loss cannot generate the reflection loss (RL) peak. Using the phase relation of face reflection, we show evidence that the λ/4 cancelation is vital to generate the RL peak. The calculated energy loss agrees well with the experimental data and lays the foundation for further research.展开更多
The financial boundaries of negotiation for the acquirer and acquiree of a non-equity corporate Merger & Acquisition (hereafter M&A) is defined. A new analyzing model to determine financial boundary for thc M&...The financial boundaries of negotiation for the acquirer and acquiree of a non-equity corporate Merger & Acquisition (hereafter M&A) is defined. A new analyzing model to determine financial boundary for thc M&A decision is developed. The negotiation range of transaction price and condition for the acquirer and acquiree by quantitative analyzing is put forward.展开更多
Dynamic architecture of multi-agent systems (MAS) is important for critical systems. As the existing formal specifications of MAS cannot describe its dynamic architecture, a formal approach using n-calculus is prese...Dynamic architecture of multi-agent systems (MAS) is important for critical systems. As the existing formal specifications of MAS cannot describe its dynamic architecture, a formal approach using n-calculus is presented, which is suited for the describing and analyzing of concurrent MAS with dynamic topology, n-calculus describes the belief-desireintention (BDI) model that represents agent's mental states and provides many useful facilities to analyze MAS model such as deadlock, behavior equivalence, and model checking. To illustrate the favorable representation capability of n-calculus, an example of dynamic multi-agent systems in e-commerce is provided. Finally, by using an existing n-calculus supporting tool, MAS model and some key behaviors properties are analyzed and verified.展开更多
Phonon modes in spherical Si quantum dots (QDs) with up to 7.9 nm in diameter are calculated by using the projection operators of the group theory into valence force field model. The phonons of dot modes in each of fi...Phonon modes in spherical Si quantum dots (QDs) with up to 7.9 nm in diameter are calculated by using the projection operators of the group theory into valence force field model. The phonons of dot modes in each of five irreducible representations (symmetries) are classified by using a dual space analysis method. It is found that the bulk-like modes with localization radius much smaller than the dot's radius have clearly pronounced bulk specific-κdefinite bulk band (one in six modes). In Si dots of all sizes, each specific bulk-like dot mode has specific symmetry.TO dot modes and bulk-like X-derived TA and LA dot modes red-shift in frequency with decreasing dot size. There is almost not LO/TO mixing for bulk-like modes. As for the surface-like modes localized at the periphery of the dot,their eigenmodes have not a dominant bulk specific-κ point parentage or a dominant BZ parentage around some special point. They are a superposition of many bulk bands with κ from all over the bulk BZ. They have much significant mode mixing than the bulk-like phonons. The classification of dot modes based on the symmetry of group theory will bring advantageous to the discussion of Ramam spectrum, electron-phonon interaction and other phonon-assisted effects in QDs.展开更多
A computer aided decision support system (merger and acquisition analyzing and evaluating-decision support system (MAAE-DSS)) for analyzing and evaluating corporate merger and acquisition (M&A) strategies, was pro...A computer aided decision support system (merger and acquisition analyzing and evaluating-decision support system (MAAE-DSS)) for analyzing and evaluating corporate merger and acquisition (M&A) strategies, was proposed. Strategic management tools such as scale index-market growth rate matrix (S-M matrix), industrial attraction-corporate strength matrix (I-S matrix), market growth rate-market occupancy matrix (G-O matrix), and life cycle-competitive position matrix (L-C matrix), were applied in the MAAE-DSS with its own data base (DB), model base (MB), method base (MeB), and knowledge base (KB), in order to support the management bureau in the formulation of M&A strategies.展开更多
BACKGROUND: ^31p magnetic resonance spectroscopy (^31p MRS) can be used to non-injuredly and dynamicly detect vadous metabolites including phosphorus in organis and reflect changes of phospholipid metabolism and en...BACKGROUND: ^31p magnetic resonance spectroscopy (^31p MRS) can be used to non-injuredly and dynamicly detect vadous metabolites including phosphorus in organis and reflect changes of phospholipid metabolism and energy metabolism in tissue and pH value in cells. OBJECTIVE: To observe changes of pH value, phospholipid metabolism and energy metabolism of various cerebral tumors and normal brain tissue with sip MRS. DESIGN: Semi-quantitative contrast observation PARTICIPANTS : A total of 44 patients with cerebral tumor diagnosed with surgery operation were selected from the Department of Magnetic Resonance, Central South Hospital, Wuhan University from September 2004 to June 2006. All the subjects had complete sip MRS data before steroid and operation. Among them, 16 patients had glioma of grade Ⅱ-Ⅲ, 12 spongioblastoma and 16 meningioma. The mean age was (45±6) years. Another 36 subjects without focus on cerebral MRI were regarded as normal group, including 19 males and 18 females, and the mean age was (41±4) years. Included subjects were consent. METHODS: Eclipse1.5T MRS (Philips Company) was used to collect wave spectrum; jMRUI(1.3) was used to analyze expenmental data and calculate pH value in voxel and ratios of phosphocreatine (PCr)/inorganic phosphate (Pi), PCr/phosphodiesterase (PDE) and phosphomonoesterase (PME)/β-adenosine triphosphate (β-ATP) of vadous metabolites. ^31p MRS results were compared with t test between tumor patients and normal subjects. MAIN OUTCOME MEASURES: Changes of phospholipid metabolism (PME./PDE), energy metabolism (PCr/ATP) and pH value of various cerebral tumors and normal brain tissues. RESULTS : A total of 44 cases with cerebral tumor and 36 normal subjects were involved in the final analysis. pH value and semi-quantitative measurements of normal brain tissues and various cerebral tumors: ① pH value at top occipital region and temple occipital region of normal brain tissue was 7.04 ±0.02; PCr/β-ATP was 1.51 ±0.03; PCr/Pi was 2.85±0.20; PDE/β-ATP was 2.70±0.40; PME/β-ATP was 1.01 ±0.03. Giioma of grade Ⅱ - Ⅲ : Tumor tissue was alkalized. The pH value was 7.09±0.01, which was higher than that in normal group (t=-1.823, P 〈 0.05); PCr/β-ATP, PME/β-ATP and PCr/ Pi were 1.50±0.04, 1.04±0.07 and 2.49±0.21, respectively, which was close to that in normal group (P 〉 0.05); PDE/β-ATP was 1.73±0.20, which was lower than that in normal group (t=-2.168, P 〈 0.05). ③ Spongioblastoma: Tumor tissue was alkalized. The pH value was 7.12±0.02, which was higher than that in normal group (t=-2.170, P 〈 0.05); PCr/β-ATP and PCr/Pi were 1.48±0.05 and 2.39±0.23, respectively, which was lower than that in normal group, but the difference was not significant (P 〉 0.05); PDE/β-ATP was 1.61±0.25, which was lower than that in normal group (t=-3.582, P 〈 0.01); PME/β-ATP was 1.64±0.05, which was higher than that in normal group (t=-3.930, P 〈 0.01). ④ Meningioma: Tumor tissue was alkalized. The pH value was 7.16±0.03, which was higher than that in normal group (t=-2.978, P 〈 0.01); PCr/β-ATP, PCr/Pi and PDE/β-ATP were 0.46±0.04, 1.08±0.16 and 0.82±0.10, respectively, which was lower than that in normal group (t=-3.132, 3.983, 3.985, P 〉 0.01); PME/β-ATP was 2.05±0.03, which was higher than that in normal group (t=-3.007, P〈 0.01). CONCLUSION: ^31p MRS can provide informations about pH value of cerebral tumor, phospholipid metabolism and energy metabolism. Changes of pH value, PCr, PME and PDE can reflect metabolic characteristics of various cerebral tumors.展开更多
Published research is minimal on vibration characteristics of hermetically sealed electromagnetic relay (EMR) ex- posed to mechanical environment. The vibration characteristics of armature system, link contact system ...Published research is minimal on vibration characteristics of hermetically sealed electromagnetic relay (EMR) ex- posed to mechanical environment. The vibration characteristics of armature system, link contact system with electromagnetic system will cause EMR malfunction. The nonlinear dynamics model of armature systems was studied by considering electro- magnetic attraction force and opposite mechanical force in this paper. Angular displacements of armature under different sinu- soidal vibration conditions are solved in order to obtain the failure mode result from armature system. Vibration tests showed the presented analyzing method is suitable for EMR. The conclusions are instructive for increasing vibration resistance of armature systems of EMR, and are significant for reliability design of switch apparatus.展开更多
How to determine accurately the association states of solutes in aqueous systems is of fundamental importance in a variety of chemical, physical, and biological processes, We apply four widely used criteria to analyze...How to determine accurately the association states of solutes in aqueous systems is of fundamental importance in a variety of chemical, physical, and biological processes, We apply four widely used criteria to analyze the dynamic association processes of solutes, e.g., amphiphilic molecules, and to find the inappropriate selections of representative sites on solutes in these criteria may bring about appreciable influence on the estimation of dynamic association behaviors such as unrealistic packing radii and even misleading packing structures. It would be better to select dynamically representative sites on solute molecules based on the characteristic of solute associations. Our detailed discussions give a guide on how to determine an appropriate criterion to accurately analyze the association behaviors of solute molecules in aqueous solutions.展开更多
This study focused on the performance of where elements analysing techniques were used to detect the elements in granite stones. These techniques are NAA (neutron activation analysis) and XRF (X-ray fluorescence)....This study focused on the performance of where elements analysing techniques were used to detect the elements in granite stones. These techniques are NAA (neutron activation analysis) and XRF (X-ray fluorescence). They were applied to detect the elements in samples which had been chosen from different areas of Pulua Penang in Malaysia collected by geophysics group which helped to describe and identify the elements found in the granite stone that were used in the study procedures to control the analytical results. The integration of both methods has enabled the researcher to determine 40 elements in the samples. The numbers of elements detected by XRF analysis method are 12 elements (Ar, K, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn); while, the elements detected by NAA method have three folds of elements with XRF analysis method were 35 elements (Na, AI, Si, K, Ca, Sc,Ti, Mn, Fe, Co, Ga, Ce, As, Br, Rb, Zr, Sb, I, Cs, Ba, La, Nd, Sm, Eu,Tb, Dy, Yb, Lu, Hf, Ta, W, Au, Pa and Np). Seven common elements were detected in both techniques: K, Sc, Ti, V, Mn, Fe and Co. Si has a higher concentration in NAA technique which is 331.8 ppm. Sc has a lower concentration in XRF technique which is 0.25 ppm. Nd has a lower concentration in NAA technique which is 3.09 - 10-5 ppm. Finally, it is found that the NAA is better to detect the elements than XRF.展开更多
This paper deals with the teaching method in reading engineering drawing. It introduces the basic theory and fundamental ideas as well as the approach of reading views by analyzing lines and planes. It gives out the s...This paper deals with the teaching method in reading engineering drawing. It introduces the basic theory and fundamental ideas as well as the approach of reading views by analyzing lines and planes. It gives out the steps for completing the third view based on the other two views. As it is easy and quick for students to read and understand views by this method, it is welcome by students in teaching practice.展开更多
A novel method was proposed, which extracted video object' s track and analyzed video object' s be- havior. Firstly, this method tracked the video object based on motion history image, and obtained the co- ordinate-...A novel method was proposed, which extracted video object' s track and analyzed video object' s be- havior. Firstly, this method tracked the video object based on motion history image, and obtained the co- ordinate-based track sequence and orientation-based track sequence of the video object. Then the pro- posed hidden markov model (HMM) based algorithm was used to analyze the behavior of video object with the track sequence as input. Experimental results on traffic object show that this method can achieve the statistics of a mass of traffic objects' behavior efficiently, can acquire the reasonable velocity behavior curve of traffic object, and can recognize traffic object' s various behaviors accurately. It provides a base for further research on video object behavior.展开更多
"Black Humor",as a literary genre."Xu Sanguan a Blood" is a novel created by a well-known writer Yu Hua in 1995.It expresses the human desire to survive when the bad luck.The story tells us that Xu..."Black Humor",as a literary genre."Xu Sanguan a Blood" is a novel created by a well-known writer Yu Hua in 1995.It expresses the human desire to survive when the bad luck.The story tells us that Xu Sanguan spent relying on selling blood they had to get a life and overcome adversity.And when he was old,Xu Sanguan knows that nobody should want his blood,his spirit has collapsed.Black humor from this man gives us more heavy consider and let's know what the truth of the life is.Xu Sanguan had the both of many hates and also many hopes about the family and the life in this story.And his black humor makes him crying with the smile and smiling with the tears.展开更多
Regeneration in the central nervous system (CNS) is limited, and CNS damage often leads to cognitive impairment or permanent functional motor and sensory loss. Impaired regenerative capacity is multifactorial and in...Regeneration in the central nervous system (CNS) is limited, and CNS damage often leads to cognitive impairment or permanent functional motor and sensory loss. Impaired regenerative capacity is multifactorial and includes inflammation, loss of the blood-brain barrier, and alteration in the extracellular matrix (ECM). One of the main problems is the formation of a glial scar and the production of inhibitory ECM, such as proteoglycans, that generates a physical and mechanical barrier, impeding axonal regrowth (Figure 1A).展开更多
The wealth of published material for English language teaching (ELT) available on the market makes selecting the right course book a challenging task. So we need to make an assessment before using a course book in the...The wealth of published material for English language teaching (ELT) available on the market makes selecting the right course book a challenging task. So we need to make an assessment before using a course book in the teaching. Course book analysis and evaluation is also useful in teaching development and helps teachers to gain good and useful insights into the nature of the material. The writer here will introduce the series of the material:New Horizon College English, and then tries to analyze and evaluate mainly on the material of viewing, listening and speaking by combining with the situation of the students in Zunyi Normal College.展开更多
基于web of science和知网数据源,利用Derwent Data Analyzer,VOSvievwer和Incites对1960—2022年盐湖相关文献进行计量分析,以深入了解国际和国内盐湖研究进展和发展趋势。分析得出近60多年盐湖研究发文量整体上呈先稳定后增加的趋势;...基于web of science和知网数据源,利用Derwent Data Analyzer,VOSvievwer和Incites对1960—2022年盐湖相关文献进行计量分析,以深入了解国际和国内盐湖研究进展和发展趋势。分析得出近60多年盐湖研究发文量整体上呈先稳定后增加的趋势;盐湖相关研究国际发文数量最高的期刊是International Journal of Systematic and Evolutionary Microbiology,国内发文量最高的期刊是《盐湖研究》。美国和中国是盐湖研究的核心力量,两者的总发文量、总引频次和高被引论文数均居前2位。盐湖研究领域发文量最高的机构是中国科学院,其隶属单位青海盐湖研究所发文量占比最高。国际文献作者前15位中8位来自中国。国际和国内研究热点演进分析得出今后盐湖资源的分离和提取将得到持续关注,高被引文章分析说明近年来盐湖研究关注最多的为盐湖资源的分离提取,尤其是锂资源。整体而言,有关盐湖研究还在不断拓展和延伸,未来我国应在文章质量、研究方向布局和影响力上继续提升,发挥国内盐湖研究的对外影响力。展开更多
文摘The systematism of weapon combat is the typical characteristic of a modern battlefield. The process of combat is complex and the demand description of weapon system of systems (SOS) is difficult. Granular analyzing is an important method for solving the complex problem in the world. Granular thinking is introduced into the demand description of weapon SoS. Granular computing and granular combination based on a relation of compatibility is proposed. Based on the level of degree and degree of detail, the granular resolution of weapon SoS is defined and an example is illustrated at the end.
基金supported by the National Natural Science Foundation of China(11674048)Sichuan Science and Technology Program(20JCQN0201).
文摘We fabricated wearable perspiration analyzing sites for actively monitoring physiological status during exercises without any batteries or other power supply.The device mainly consists of ZnO nanowire(NW)arrays and flexible polydimethylsiloxane substrate.Sweat on the skin can flow into the flow channels of the device through capillary action and flow along the channels to ZnO NWs.The sweat flowing on the NWs(with lactate oxidase modification)can output a DC electrical signal,and the outputting voltage is dependent on the lactate concentration in the sweat as the biosensing signal.ZnO NWs generate electric double layer(EDL)in sweat,which causes a potential difference between the upper and lower ends(hydrovoltaic effect).The product of the enzymatic reaction can adjust the EDL and influence the output.This device can be integrated with wireless transmitter and may have potential application in constructing sports big data.This work promotes the development of next generation of biosensors and expands the scope of self-powered physiological monitoring system.
基金Supported by the Fundamental Research Fund for the Central Universities under Grant No LZUJBKY-2015-121the National Natural Science Foundations of China under Grant Nos 11574122 and 51102124the National Science Foundation for Fostering Talents in Basic Research of the National Natural Science Foundation of China
文摘Metallic flaky sendust particles are prepared for use as fillers in electromagnetic attenuation composites. We report the interface reflection model to divide the broad bandwidth into electromagnetic loss and quarter-wavelength (λ/4) cancelation. Combining with the face reflection calculation, we identify the electromagnetic loss originated from skin effect, which is used to explain over half of the absorbed energy in high frequency band. Most impor- tantly, the unique electromagnetic loss cannot generate the reflection loss (RL) peak. Using the phase relation of face reflection, we show evidence that the λ/4 cancelation is vital to generate the RL peak. The calculated energy loss agrees well with the experimental data and lays the foundation for further research.
文摘The financial boundaries of negotiation for the acquirer and acquiree of a non-equity corporate Merger & Acquisition (hereafter M&A) is defined. A new analyzing model to determine financial boundary for thc M&A decision is developed. The negotiation range of transaction price and condition for the acquirer and acquiree by quantitative analyzing is put forward.
基金Project supported by the National High-Technology Research and Development Program of China(Grant No.8632003AA721070)
文摘Dynamic architecture of multi-agent systems (MAS) is important for critical systems. As the existing formal specifications of MAS cannot describe its dynamic architecture, a formal approach using n-calculus is presented, which is suited for the describing and analyzing of concurrent MAS with dynamic topology, n-calculus describes the belief-desireintention (BDI) model that represents agent's mental states and provides many useful facilities to analyze MAS model such as deadlock, behavior equivalence, and model checking. To illustrate the favorable representation capability of n-calculus, an example of dynamic multi-agent systems in e-commerce is provided. Finally, by using an existing n-calculus supporting tool, MAS model and some key behaviors properties are analyzed and verified.
文摘Phonon modes in spherical Si quantum dots (QDs) with up to 7.9 nm in diameter are calculated by using the projection operators of the group theory into valence force field model. The phonons of dot modes in each of five irreducible representations (symmetries) are classified by using a dual space analysis method. It is found that the bulk-like modes with localization radius much smaller than the dot's radius have clearly pronounced bulk specific-κdefinite bulk band (one in six modes). In Si dots of all sizes, each specific bulk-like dot mode has specific symmetry.TO dot modes and bulk-like X-derived TA and LA dot modes red-shift in frequency with decreasing dot size. There is almost not LO/TO mixing for bulk-like modes. As for the surface-like modes localized at the periphery of the dot,their eigenmodes have not a dominant bulk specific-κ point parentage or a dominant BZ parentage around some special point. They are a superposition of many bulk bands with κ from all over the bulk BZ. They have much significant mode mixing than the bulk-like phonons. The classification of dot modes based on the symmetry of group theory will bring advantageous to the discussion of Ramam spectrum, electron-phonon interaction and other phonon-assisted effects in QDs.
文摘A computer aided decision support system (merger and acquisition analyzing and evaluating-decision support system (MAAE-DSS)) for analyzing and evaluating corporate merger and acquisition (M&A) strategies, was proposed. Strategic management tools such as scale index-market growth rate matrix (S-M matrix), industrial attraction-corporate strength matrix (I-S matrix), market growth rate-market occupancy matrix (G-O matrix), and life cycle-competitive position matrix (L-C matrix), were applied in the MAAE-DSS with its own data base (DB), model base (MB), method base (MeB), and knowledge base (KB), in order to support the management bureau in the formulation of M&A strategies.
基金the grants fromHealth Department of HubeiProvince, No. 301140319
文摘BACKGROUND: ^31p magnetic resonance spectroscopy (^31p MRS) can be used to non-injuredly and dynamicly detect vadous metabolites including phosphorus in organis and reflect changes of phospholipid metabolism and energy metabolism in tissue and pH value in cells. OBJECTIVE: To observe changes of pH value, phospholipid metabolism and energy metabolism of various cerebral tumors and normal brain tissue with sip MRS. DESIGN: Semi-quantitative contrast observation PARTICIPANTS : A total of 44 patients with cerebral tumor diagnosed with surgery operation were selected from the Department of Magnetic Resonance, Central South Hospital, Wuhan University from September 2004 to June 2006. All the subjects had complete sip MRS data before steroid and operation. Among them, 16 patients had glioma of grade Ⅱ-Ⅲ, 12 spongioblastoma and 16 meningioma. The mean age was (45±6) years. Another 36 subjects without focus on cerebral MRI were regarded as normal group, including 19 males and 18 females, and the mean age was (41±4) years. Included subjects were consent. METHODS: Eclipse1.5T MRS (Philips Company) was used to collect wave spectrum; jMRUI(1.3) was used to analyze expenmental data and calculate pH value in voxel and ratios of phosphocreatine (PCr)/inorganic phosphate (Pi), PCr/phosphodiesterase (PDE) and phosphomonoesterase (PME)/β-adenosine triphosphate (β-ATP) of vadous metabolites. ^31p MRS results were compared with t test between tumor patients and normal subjects. MAIN OUTCOME MEASURES: Changes of phospholipid metabolism (PME./PDE), energy metabolism (PCr/ATP) and pH value of various cerebral tumors and normal brain tissues. RESULTS : A total of 44 cases with cerebral tumor and 36 normal subjects were involved in the final analysis. pH value and semi-quantitative measurements of normal brain tissues and various cerebral tumors: ① pH value at top occipital region and temple occipital region of normal brain tissue was 7.04 ±0.02; PCr/β-ATP was 1.51 ±0.03; PCr/Pi was 2.85±0.20; PDE/β-ATP was 2.70±0.40; PME/β-ATP was 1.01 ±0.03. Giioma of grade Ⅱ - Ⅲ : Tumor tissue was alkalized. The pH value was 7.09±0.01, which was higher than that in normal group (t=-1.823, P 〈 0.05); PCr/β-ATP, PME/β-ATP and PCr/ Pi were 1.50±0.04, 1.04±0.07 and 2.49±0.21, respectively, which was close to that in normal group (P 〉 0.05); PDE/β-ATP was 1.73±0.20, which was lower than that in normal group (t=-2.168, P 〈 0.05). ③ Spongioblastoma: Tumor tissue was alkalized. The pH value was 7.12±0.02, which was higher than that in normal group (t=-2.170, P 〈 0.05); PCr/β-ATP and PCr/Pi were 1.48±0.05 and 2.39±0.23, respectively, which was lower than that in normal group, but the difference was not significant (P 〉 0.05); PDE/β-ATP was 1.61±0.25, which was lower than that in normal group (t=-3.582, P 〈 0.01); PME/β-ATP was 1.64±0.05, which was higher than that in normal group (t=-3.930, P 〈 0.01). ④ Meningioma: Tumor tissue was alkalized. The pH value was 7.16±0.03, which was higher than that in normal group (t=-2.978, P 〈 0.01); PCr/β-ATP, PCr/Pi and PDE/β-ATP were 0.46±0.04, 1.08±0.16 and 0.82±0.10, respectively, which was lower than that in normal group (t=-3.132, 3.983, 3.985, P 〉 0.01); PME/β-ATP was 2.05±0.03, which was higher than that in normal group (t=-3.007, P〈 0.01). CONCLUSION: ^31p MRS can provide informations about pH value of cerebral tumor, phospholipid metabolism and energy metabolism. Changes of pH value, PCr, PME and PDE can reflect metabolic characteristics of various cerebral tumors.
基金Project (No. FEBQ24409102) supported by the Space Technology Innovation Fund, China
文摘Published research is minimal on vibration characteristics of hermetically sealed electromagnetic relay (EMR) ex- posed to mechanical environment. The vibration characteristics of armature system, link contact system with electromagnetic system will cause EMR malfunction. The nonlinear dynamics model of armature systems was studied by considering electro- magnetic attraction force and opposite mechanical force in this paper. Angular displacements of armature under different sinu- soidal vibration conditions are solved in order to obtain the failure mode result from armature system. Vibration tests showed the presented analyzing method is suitable for EMR. The conclusions are instructive for increasing vibration resistance of armature systems of EMR, and are significant for reliability design of switch apparatus.
基金Supported by the National Science Fund for Outstanding Young Scholars under Grant No 11422542the Key Research Program of Chinese Academy of Sciences under Grant No KJZD-EW-M03,KIPCAS+1 种基金the Shanghai Supercomputer Center of Chinathe High Performance Computing Center of Shanghai University
文摘How to determine accurately the association states of solutes in aqueous systems is of fundamental importance in a variety of chemical, physical, and biological processes, We apply four widely used criteria to analyze the dynamic association processes of solutes, e.g., amphiphilic molecules, and to find the inappropriate selections of representative sites on solutes in these criteria may bring about appreciable influence on the estimation of dynamic association behaviors such as unrealistic packing radii and even misleading packing structures. It would be better to select dynamically representative sites on solute molecules based on the characteristic of solute associations. Our detailed discussions give a guide on how to determine an appropriate criterion to accurately analyze the association behaviors of solute molecules in aqueous solutions.
文摘This study focused on the performance of where elements analysing techniques were used to detect the elements in granite stones. These techniques are NAA (neutron activation analysis) and XRF (X-ray fluorescence). They were applied to detect the elements in samples which had been chosen from different areas of Pulua Penang in Malaysia collected by geophysics group which helped to describe and identify the elements found in the granite stone that were used in the study procedures to control the analytical results. The integration of both methods has enabled the researcher to determine 40 elements in the samples. The numbers of elements detected by XRF analysis method are 12 elements (Ar, K, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn); while, the elements detected by NAA method have three folds of elements with XRF analysis method were 35 elements (Na, AI, Si, K, Ca, Sc,Ti, Mn, Fe, Co, Ga, Ce, As, Br, Rb, Zr, Sb, I, Cs, Ba, La, Nd, Sm, Eu,Tb, Dy, Yb, Lu, Hf, Ta, W, Au, Pa and Np). Seven common elements were detected in both techniques: K, Sc, Ti, V, Mn, Fe and Co. Si has a higher concentration in NAA technique which is 331.8 ppm. Sc has a lower concentration in XRF technique which is 0.25 ppm. Nd has a lower concentration in NAA technique which is 3.09 - 10-5 ppm. Finally, it is found that the NAA is better to detect the elements than XRF.
基金Supported by Chongqing University’s Book Construction Fund (No. 200515).
文摘This paper deals with the teaching method in reading engineering drawing. It introduces the basic theory and fundamental ideas as well as the approach of reading views by analyzing lines and planes. It gives out the steps for completing the third view based on the other two views. As it is easy and quick for students to read and understand views by this method, it is welcome by students in teaching practice.
基金supported by the High Technology Research and Development Programme of China(No.2004AA742209)
文摘A novel method was proposed, which extracted video object' s track and analyzed video object' s be- havior. Firstly, this method tracked the video object based on motion history image, and obtained the co- ordinate-based track sequence and orientation-based track sequence of the video object. Then the pro- posed hidden markov model (HMM) based algorithm was used to analyze the behavior of video object with the track sequence as input. Experimental results on traffic object show that this method can achieve the statistics of a mass of traffic objects' behavior efficiently, can acquire the reasonable velocity behavior curve of traffic object, and can recognize traffic object' s various behaviors accurately. It provides a base for further research on video object behavior.
文摘"Black Humor",as a literary genre."Xu Sanguan a Blood" is a novel created by a well-known writer Yu Hua in 1995.It expresses the human desire to survive when the bad luck.The story tells us that Xu Sanguan spent relying on selling blood they had to get a life and overcome adversity.And when he was old,Xu Sanguan knows that nobody should want his blood,his spirit has collapsed.Black humor from this man gives us more heavy consider and let's know what the truth of the life is.Xu Sanguan had the both of many hates and also many hopes about the family and the life in this story.And his black humor makes him crying with the smile and smiling with the tears.
文摘Regeneration in the central nervous system (CNS) is limited, and CNS damage often leads to cognitive impairment or permanent functional motor and sensory loss. Impaired regenerative capacity is multifactorial and includes inflammation, loss of the blood-brain barrier, and alteration in the extracellular matrix (ECM). One of the main problems is the formation of a glial scar and the production of inhibitory ECM, such as proteoglycans, that generates a physical and mechanical barrier, impeding axonal regrowth (Figure 1A).
文摘The wealth of published material for English language teaching (ELT) available on the market makes selecting the right course book a challenging task. So we need to make an assessment before using a course book in the teaching. Course book analysis and evaluation is also useful in teaching development and helps teachers to gain good and useful insights into the nature of the material. The writer here will introduce the series of the material:New Horizon College English, and then tries to analyze and evaluate mainly on the material of viewing, listening and speaking by combining with the situation of the students in Zunyi Normal College.
文摘基于web of science和知网数据源,利用Derwent Data Analyzer,VOSvievwer和Incites对1960—2022年盐湖相关文献进行计量分析,以深入了解国际和国内盐湖研究进展和发展趋势。分析得出近60多年盐湖研究发文量整体上呈先稳定后增加的趋势;盐湖相关研究国际发文数量最高的期刊是International Journal of Systematic and Evolutionary Microbiology,国内发文量最高的期刊是《盐湖研究》。美国和中国是盐湖研究的核心力量,两者的总发文量、总引频次和高被引论文数均居前2位。盐湖研究领域发文量最高的机构是中国科学院,其隶属单位青海盐湖研究所发文量占比最高。国际文献作者前15位中8位来自中国。国际和国内研究热点演进分析得出今后盐湖资源的分离和提取将得到持续关注,高被引文章分析说明近年来盐湖研究关注最多的为盐湖资源的分离提取,尤其是锂资源。整体而言,有关盐湖研究还在不断拓展和延伸,未来我国应在文章质量、研究方向布局和影响力上继续提升,发挥国内盐湖研究的对外影响力。