|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Magnetic resonance diffusion-weighted imaging in the diagnosis of diffuse liver diseases in rats显示文摘Background The diagnosis of diffuse hepatic lesions in early stage is a tough task at any time for clinical conventional imaging. Magnetic resonance diffusion-weighted imaging (MR DWI) can detect the changes of tissue structure at molecular level. This study was designed to determine the value of DWI in the diagnosis of diffuse liver lesions in early stage. Methods Diffuse liver lesions were induced by diethylnitrosamine in 42 rats of test group. Fourteen rats in control group were fed with pure water. Dynamic changes of MR DWI were observed every week in both groups during the early stage of diffuse liver lesions (1 to 12 weeks after drug administration in the test group). Apparent diffusion coefficient (ADC) values of liver parenchyma in different stages and pathologic changes were analyzed. Results The process of diffuse hepatic lesions in the test group was classified into three stages according to pathological changes, namely hepatitis, hepatic fibrosis and cirrhosis. No obvious morphological changes were shown by conventional imaging in both groups during this stage. But MR DWI demonstrated heterogeneous signal changes in early stage of hepatic cirrhosis in the test group. No significant change of ADC values was found in the control group between different weeks ( P >0.05). The ADC values of the test group declined from the fifth week, and after the tenth week the ADC values were significantly different between the test and control groups at gradient factor (b) value 300 sec/mm 2 ( P <0.05). At b value 600 and 1000 sec/mm 2, significant difference was seen between the two groups from the sixth week onward. The range of ADC value of the groups was (1.7-0.9)±(0.40-0.04) mm 2/sec (b=600) and (1.38-0.75)±(0.07-0.35) mm 2/sec (b=1000), respectively. Dominant pathological changes included swelled hepatocytes within 1 to 4 weeks after the administration of diethylnitrosamine in the test group, hyperplasia of fibrous tissues in 5-8 weeks and formation of cirrhotic nodules in 9-12 weeks. Conclusions MR functional DWI could detect diffuse liver lesions earlier than conventional morphological imaging. ADC value as a marker for early diagnosis of diffuse liver lesions could also be used to inspect changes of the | GUANSheng ZHOUKang-rong ZHAOWei-dong PENGWei-jun TANGFeng MAOJian | 2005 | Chinese Medical Journal2005，，8： | 28 |
| 2 | Physical and mechanical properties of sandstone containing a single fissure after exposure to high temperatures显示文摘In order to investigate the physical and mechanical properties of sandstone containing fissures after exposure to high temperatures,fissures with different angles α were prefabricated in the plate sandstone samples,and the processed samples were then heated at 5 different temperatures.Indoor uniaxial compression was conducted to analyze the change rules of physical properties of sandstone after exposure to high temperature,and the deformation,strength and failure characteristics of sandstone containing fissures.The results show that,with increasing temperature,the volume of sandstone increases gradually while the quality and density decrease gradually,and the color of sandstone remains basically unchanged while the brightness increases markedly when the temperature is higher than 585 ℃;the peak strength of sandstone containing fissures first decreases then increases when the temperature is between 25℃and 400℃.The peak strain of sandstone containing fissures increases gradually while the average modulus decreases gradually with increasing temperature,and the mechanical properties of sandstone show obvious deterioration after 400 ℃.The peak strain of sandstone containing fissures increases gradually while the average modulus decreases gradually with increasing temperature;with increasing angle αof the fissure,the evolution characteristics of the macro-mechanical parameters of sandstone are closely related to the their own mechanical properties.When the temperature is 800 ℃,the correlation between the peak strength and average modulus of sandstone and the angle α of the fissure is obviously weakened.The failure modes of sandstone containing fissures after high temperature exposure are of three different kinds including:tensile crack failure,tensile and shear cracks mixed failure,and shear crack failure.Tensile and shear crack mixed failure occur mainly at low temperatures and small angles;tensile crack failure occurs at high temperatures and large angles. | Zhu Tantan Jing Hongwen Su Haijian Yin Qian Du Mingrui Han Guansheng | 2016 | International Journal of Mining Science and Technology2016，26，2： | 15 |
| 3 | Anisotropic surface roughness and shear behaviors of rough-walled plaster joints under constant normal load and constant normal stiffness conditions显示文摘In this context,we experimentally studied the anisotropic mechanical behaviors of rough-walled plaster joints using a servo-controlled direct shear apparatus under both constant normal load(CNL)and constant normal stiffness(CNS)conditions.The shear-induced variations in the normal displacement,shear stress,normal stress and sheared-off asperity mass are analyzed and correlated with the inclination angle of the critical waviness of joint surfaces.The results show that CNS condition gives rise to a smaller normal displacement due to the larger normal stress during shearing,compared with CNL condition.Under CNL conditions,there is one peak shear stress during shearing,whereas there are no peak shear stress for some cases and two peaks for other cases under CNS conditions depending on the geometry of joint surfaces.The inclination angle of the critical waviness has been verified to be capable of describing the joint surface roughness and anisotropy.The joint surface is more significantly damaged under CNS conditions than that under CNL conditions.With increment of the inclination angle of the critical waviness,both the normal displaceme nt and shea red-off asperity mass increase,following power law functions;yet the coefficient of deternination under CNL conditions is larger than that under CNS conditions.This is because the CNS condition significantly decreases the inclination angle of the critical waviness during shearing due to the larger degree of asperity degradation. | Richeng Liu Sha Lou Xiaojing Li Guansheng Han Yujing Jiang | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，2： | 5 |
| 4 | Experimental investigation on dilatancy behavior of water-saturated sandstone显示文摘It is important to study the dilatancy property of water-saturated rock for understanding the engineering behavior of loaded rock mass. This study carried out the uniaxial and triaxial compressive experiments on the water-saturated red sandstone, analyzed the influences of confining pressure and pore pressure on dilatancy property of water-saturated rock, and discussed the reasonable basis of the stress of dilatancy onset as a strength design parameter of rock engineering, finally established the prediction model of the stress of dilatancy onset under the impacts of confining pressure and pore pressure. The results show that the strength parameters(the stress of dilatancy onset and peak strength) and deformation parameters(axial strain and circumferential strain) of water-saturated sandstone increase with the confining pressure, and the relations can be fitted with a positive linear function. The cohesion and internal friction angle obtained from the stress of dilatancy onset decrease by 11.57% and 7.33%, respectively, when compared with those obtained from the peak strength. The strength parameters and deformation parameters of water-saturated sandstone decrease basically with the increase of pore pressure, in which the relations between strength parameters or axial strain and pore pressure can be fitted with a negative linear function. However, the relation between the peak circumferential strain and the pore pressure should be characterized by a negative exponential function, and the circumferential strain at dilatancy onset isn't affected by the pore pressure. | Jiangyu Wu Meimei Feng Bangyong Yu Wenli Zhang Xiaoyan Ni Guansheng Han | 2018 | International Journal of Mining Science and Technology2018，28，2： | 4 |
| 5 | A study of the Income of Tibetan Peasants and Herdsmen显示文摘1. The present situation and structure of the income of peasants and herdsmen Before tackling the topic of Tibetan peasants and herdsmen's increasing income, one should have an overall understanding of their income level and have a clear view of its structure and sources. Only by grasping this basic data correctly and accurately, can we form an objective and just conclusion that can be accepted not only by the academic circles but also the decision-makers. | Lhorong Dradul Chen Guansheng(Translated) | 2006 | China Tibetology2006，，1： | 2 |
| 6 | The lymphoscintigraphic manifestation of 99mTc-dextran lymphatic imaging in primary intestinal lymphangiectasia显示文摘 | Zhe Wen Guansheng Tong Yong Liu Jacqui K. Meeks Daqing Ma Jigang Yang | 2014 | Nuclear Medicine Communications2014，，5： | 1 |
| 7 | Adaptive simulated annealing for the optimal design of electromagnetic devices显示文摘 | Wang Youhua Yan Weili Zhang Guansheng | 1996 | IEEE Transactions on Magnetics1996，32，3： | 1 |
| 8 | The application of kinetics based simulation method in thermal risk prediction of coal显示文摘 | Guansheng Qi Deming Wang Yun Chen Haihui Xin Xuyao Qi Xiaoxing Zhong | 2014 | Journal of Loss Prevention in the Process Industries2014，，： | 1 |
| 9 | Interpretation of WHO Guideline:Assessing and Managing Children at Primary Health-care Facilities to Prevent overweight and Obesity in the Context of the Double Burden of Malnutrition显示文摘Along with the transitions of social and economic development,dietary patterns and physical activity and life-styles,the prevalence of childhood overweight and obesity has increased at an astonishing rate in the past decades,and has become one of the most serious public health challenges.Meanwhile,the stunting rate has declined with slowly pace,while millions of young lives are still be threatened by wasting all over the word.The present situation of Double Burden of Malnutrition should be recognized clearly and addressed seriously,which refers to,the common presence of both obesity and underweight in the same populations,communities and even families.In order to provide guidance on the appropriate assessment and management of infants and children presenting to primary health-care facilities,to reduce the risk of overweight and obesity among children,the Guideline Assessing and Managing Children at Primary Healthcare Facilities to Prevent Overweight and Obesity in the Context of the Double Burden of Malnutrition was developed and released by WHO in 2017 using the procedures outlined in the WHO handbook for guideline development.The WHO Guideline(2017)is intended primarily for use in low-and medium-resource settings where both under-nutrition and obesity are prevalent.In this guideline,there are three prioritized speci c areas and questions for infants and children presenting to primary health-care facilities:anthropometric assessment,care of infants and children with acute or chronic malnutrition,and care of children who are overweight or obese.It is recommended that for infants and children aged<5 years presenting primary health-care facilities,weight and length/height should be measured and evaluate adequately,general nutrition and physical activity counselling should be provided for related caregivers and families,identi cation and appropriate management plan should be developed at primary health-care level.The discrepancies of the recommendation on the three prioritized areas in di erent guidelines are compared in this paper.All the related guidelines emphasize the important of anthropometric measurement and monitor of growth for primary care workers and suggest dietary and physical activity counselling for obese people.Almost all the guidelines provide recommendations on breastfeeding and continued feeding counselling from the aspect of improving the status of acute or chronic malnutrition.The setting condition should be carefully considered when taking the guidelines of di erent organizations and countries into application. | Na Zhang Guansheng Ma | 2018 | Global Health Journal2018，2，2： | 1 |
| 10 | Droplet- based microfluidic flow injection system with large-scale con- centration gradient by a single nanoliter-scale injection for en- zyme inhibition assay显示文摘 | CAI LongFei ZHU Ying DU GuanSheng | 2012 | Anal Chem2012，84，1： | 1 |
| 11 | Preventing and treating lymphatic minute metastasis with (32)P chromic phosphate during an operation显示文摘 | Daozhen C Lu L Guansheng T | 2007 | Cancer Biother Radiopharm2007，22，1： | 1 |
| 12 | A technology based on image processing for the bridge crack measure- ment显示文摘 | XU Bing YIN Guansheng LIU Xiaowei | 2012 | Applied Mechanics and Mechanical Engineer- ing2012，，138189： | 1 |
| 13 | Kinetics char- acteristics of coal low-temperature oxidation in oxygen-depleted air 显示文摘 | Qi Guansheng Wang Deming Zheng Keming et a/ | 2015 | Journal of Loss Prevention in the Process Industries2015，35，： | 1 |
| 14 | Gyalse Regime Contribution to the Maintenance of Communications Between China and the Western Regions显示文摘The Gyalse (rgyal-sras) regime of the Tubo tribes rose at the beginning of the ^IIth century. Its founder, Gyalse, was a Tubo chieftain of the He-Huang area, between the Yellow and the Huangshui Rivers in East Qinghai and West Gansu. A descendant of the Tubo Tsenpo royal family, and a leader of great talent and bold vision, | Zhu Qiyuan Chen Guansheng | 2003 | China Tibetology2003，，1： | 1 |
| 15 | Abdominal obesity and the prevalence of diabetes andintermediate hyperglycaemia in Chinese adults显示文摘 | HE Yuna ZHAI Fengying MA Guansheng | | Public Health Nutrition0，12，8： | 1 |
| 16 | Joule–Thomson expansion of higher dimensional nonlinearly AdS black hole with power Maxwell invariant source显示文摘In this paper,the Joule–Thomson expansion of the higher dimensional nonlinearly anti-de Sitter(Ad S)black hole with power Maxwell invariant source is investigated.The results show the Joule–Thomson coefficient has a zero point and a divergent point,which coincide with the inversion temperature Tiand the zero point of the Hawking temperature,respectively.The inversion temperature increases monotonously with inversion pressure.For the high-pressure region,the inversion temperature decreases with the dimensionality D and the nonlinearity parameter s,whereas it increases with the charge Q.However,Tifor the low-pressure region increase with D and s,while it decreases with Q.The ratioηBHbetween the minimum inversion temperature and the critical temperature does not depend on Q,it recovers the higher dimensional Reissner–N?rdstrom Ad S black hole case when s=1.However,for s>1,it becomes smaller and smaller as D increases and approaches a constant when D→∞.Finally,we found that an increase of mass M and s,or reducing the charge Q and D can enhance the isenthalpic curve,and the effect of s on the isenthalpic curve is much greater than other parameters. | Zhong-Wen Feng Xia Zhou Guansheng He Shi-Qi Zhou Shu-Zheng Yang | 2021 | Communications in Theoretical Physics2021，73，6： | 1 |
| 17 | Kinetics characteristics of coal low-temperature oxidation in oxygendepleted air显示文摘 | Qi Guansheng Wang Deming Zheng Keming | 2015 | Journal of Loss Prevention in the Process Industries2015，35，： | 1 |
| 18 | Distributed K-means based on soft constraints显示文摘 | Yu Yuecheng Wang Jiandong Zheng Guansheng | | 0，，04： | 1 |
| 19 | Influence Of Tibetan Buddhism On The Hinterland In The Ming Dynasty显示文摘The main sects of Tibetan Buddhism(popularly; Lamaism)were originally the Nyingma(rnying-ma), Kagyu(bkav-brgyud),Kadam and Sakya(sa-skya) traditions.Tsongkhapa founded the Gelug(dge-lugs) sect at the beginning of the ISth century Afterwards, the Kadam sect merged into the Gelug sect.There- fore the four main sects of Tibetan Buddhism became the Nyingma,Kagyu,Gelug and Sakya,which continue today Tibetan Buddhism's eastward spread was a long process.Tibetan Buddhism began to spread from the Qinghai-Tibet Plateau northward to Xixia(called Mi- | Chen Nan Chen Guansheng(Translated ) Li Peizhu(Translated ) | 2008 | China Tibetology2008，，2： | 1 |
| 20 | The Export of Silk to Tibetan Areas in the Ming Period and Its Impacts显示文摘Silk handicrafts are most representative of the Chi- nese hinterland and have played an important role in interethnic cultural exchanges throughout China.Ever since the Tang dynasty(618-907),a'Silk Road'had existed between the hinterland and the Snow Land and had promoted friendship and cultural exchanges be- tween Han and Tibetan peoples.During the Song(960- 1279)and the Yuan dynasties(1271-1368),silk was ex- | Wu Mingdi Chen Guansheng(Translated) | 2008 | China Tibetology2008，，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员