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   Science & Technology Review
2015, Vol.33, No. 22
28 November 2015


Scientific Community Promotion
Book Reviews
News Around
News Focus
Special Column of Science
Academic Discussion
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Science & Technology Review. 2015, 33 (22): 3-3.
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Science & Technology Review. 2015, 33 (22): 6-6.
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Science & Technology Review. 2015, 33 (22): 8-8.
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Science & Technology Review. 2015, 33 (22): 10-10.
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Science & Technology Review. 2015, 33 (22): 11-11.
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Science & Technology Review. 2015, 33 (22): 120-120.
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Science & Technology Review. 2015, 33 (22): 121-121.
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Science & Technology Review. 2015, 33 (22): 124-124.
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Science & Technology Review. 2015, 33 (22): 128-128.
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Science & Technology Review. 2015, 33 (22): 1-1.
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News Around

Science & Technology Review. 2015, 33 (22): 7-7.
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News Focus

Science & Technology Review. 2015, 33 (22): 9-9.
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Science & Technology Review. 2015, 33 (22): 12-12.
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Geometry and General Relativity-the centennial of General Relativity

Shing-Tung Yau
Science & Technology Review. 2015, 33 (22): 13-18. ;  doi: 10.3981/j.issn.1000-7857.2015.22.001
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Carbon and oxygen isotope composition of carbonatic rock from the Middle Permian-Lower Triassic in Chuanxi area

XIAO Sheng, XIAO Chuantao, LIANG Wenjun
Science & Technology Review. 2015, 33 (22): 19-26. ;  doi: 10.3981/j.issn.1000-7857.2015.22.002
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Abstract ( 1016 )
For the Middle Permian-Lower Triassic marine carbonate rocks in Chuanxi area, the author analyzed the carbon and oxygen isotope three cross-sectional data and calculated the Z value and the ancient temperature in combination with sedimentary facies and paleo organisms to systematically study the carbon and oxygen isotopic characteristics of carbonate rocks in the region and the paleo environment. The results show that the value of δ13C varies from -3.90‰ to 2.80‰ in the study area, mainly concentrated between -2.80‰ and 2.80‰, and -0.04‰ on average; The value of δ18O varies from - 9.70‰ to -1.80‰, mainly concentrated between -8‰ and -4‰, and -6.60‰ on average. Through calculation and analysis of the Z value and the paleo temperature it can be seen that Middle Permian-Lower Triassic in Chuanxi area was basically in the marine environment with seawater temperature between 8.8 and 68.4℃ and the main distribution range 16 to 33℃. The study area basically belonged to the warm or hot tropical climate and experienced three major cycles of sea level changes: Qixia period to the Maokou period, Wujiaping middle period to Changxin period, and Feixianguan period to Jialingjiang period.

Physical simulation of different gas flooding modes in extra/ultra-low permeability reservoirs

XIAO Pufu, YANG Zhengming, WANG Xuewu, JIANG Baicai, LIU Guozhong
Science & Technology Review. 2015, 33 (22): 27-31. ;  doi: 10.3981/j.issn.1000-7857.2015.22.003
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Abstract ( 984 )
The physical simulation of the core of Daqing peripheral extra/ultra-low permeability reservoirs is designed, combined with the nuclear magnetic resonance (NMR), in consideration of four kinds of gas injection modes, that is, water injection converting to gas injection, CO2 miscible flooding, CO2 immiscible gas injection and the cycle gas injection, to study the oil displacement efficiency and the residual oil distribution of different levels permeability cores, for the development of the pilot area of Daqing CO2 pilot test area. Results indicate that, under the same conditions, the effect of the conventional water injection is the worst, but after converting to the gas injection, a larger ascension may be achieved. For extra low permeability cores, the cycle gas injection displacement efficiency is the highest. For ultra-low permeability cores, the effect of the water transfer gas is higher than that of other three modes. The residual oil distribution shows that, for the water transfer gas, the CO2 miscible flooding and the immiscible CO2 flooding, with a main use of oil in the large-medium pore, the crude oil in clay micro pore is hard to drive, but during the time of the cycle gas injection process, under the action of capillary force and the elastic energy, the crude oil flows from the micro pore to the large-medium pore, thus increasing the utilization of crude oil in small pores.

Heat preservation suggestions and heat loss analysis of geothermal well

ZHU Ming, DUAN Youzhi, GAO Xiaorong, YUE Hui, PANG Wei, YAO Zhiliang
Science & Technology Review. 2015, 33 (22): 32-36. ;  doi: 10.3981/j.issn.1000-7857.2015.22.004
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Abstract ( 906 )
The heat preservation and its cost have become the bottleneck of the geothermal resource development. With this in view, a wellbore temperature calculation model is established based on the characteristics of the well bore configuration of the geothermal well. The model is validated through the test data of the geothermal well A,and it is used for sensitivity analysis of the heat loss factors of the geothermal wells. The results show that a geothermal well is changed from a part segment production to the full segment production through well washing and other effective measures, by which the well head temperature is increased from 61.2℃ to 65.7℃. The wellhead liquid temperature can be increased by increasing the fluid production rate, however, the increasing trend slows down as the rate increases. Also the wellhead liquid temperature is significantly affected by the well bore configuration that needs a systematic optimization. At last a 400 meter heat preservation tubing can increase the wellhead liquid temperature by 2.7℃. Based on the analysis results, the corresponding heat preservation suggestions are proposed, for the development of geothermal wells.

Analysis of the land use history and the causes in Yellow River Delta during the last 15 years

LI Chang, LI Gui'e, XIE Zhiwen, WANG Hongchen
Science & Technology Review. 2015, 33 (22): 37-44. ;  doi: 10.3981/j.issn.1000-7857.2015.22.005
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Abstract ( 839 )
The Yellow River Delta is one of three major river deltas in China and the fastest growing areas for land resources in the world. With the influence of the interaction between the natural succession and the artificial interference, the LUCC changes rapidly and becomes the focus of current researches in this area. The analysis of the land use in the oriented zone has been completed in aspects of the quantity and the structure by interpreting the remotely sensed images of 1995, 2004 and 2010. The LUCC is analyzed based on the transfer matrix, and the picture of the land use variation. Furthermore, from natural and social aspects, the contributing factors are explored and analyzed by combining the current basic data source. The results show that the curves of all kinds of land use are dynamic in the oriented zone; the area of the construction land, the water, the salt field and the ponds is expanding; while the area of the grassland and the woodland is dwindling; The portion of the unused land keeps still large; and the complexity of the land use types increases constantly. The effects of natural factors and social factors work together, and influence the change of land use types in the oriented zone mutually. The social factors play a leading role, but the influence of natural factors also cannot be ignored during the processing.

Characterization and analysis of preservative paper made by activated carbon loaded by potassium permanganate

WANG Haili, XIAO Shengling, YUE Jinquan, LIU Yinxin
Science & Technology Review. 2015, 33 (22): 45-49. ;  doi: 10.3981/j.issn.1000-7857.2015.22.006
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Abstract ( 707 )
Preservative is made by modified activated carbon which contains potassium permanganate, the paper is used as carrier, and the preservative paper is developed by the method of putting preservatives into pulp. Analytical methods such as the infrared spectrum (FTIR), the X ray diffraction (XRD), the thermogravimetric analysis (TGA) and the scanning electron microscope (SEM) are used to study the structures of the preservative and the preservative paper. The FTIR analysis shows that the activated carbon loaded with the saturated potassium permanganate contains more oxygen functional groups on the surface, the combination of the antistaling agent and the paper serves as the physical bond. The XRD analysis shows that the potassium permanganate could destroy the crystal structure of the activated carbon, the crystallization degree of the preservative paper is decreased after the antistaling agent is added. From the TGA curve, it is seen that the temperature of the thermal decomposition of the fresh paper is lower than that of the control group, which is due to the decrease of the crystallinity of the preservative paper. The result of the SEM test shows that the antistaling agent could make the preservative paper surface coarse.

Preparation and properties of TPU/PVB composite materials

LIU Yunxue, YAO Pengcheng, ZHAO Zhibin, FAN Zhaorong, GU Yaxin, XU Chang
Science & Technology Review. 2015, 33 (22): 50-54. ;  doi: 10.3981/j.issn.1000-7857.2015.22.007
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Abstract ( 800 )
Thermoplastic polyurethane elastomer/polyvinyl butyral (TPU/PVB) composite materials are prepared by melt-blending. The structure, the processing rheological properties, the thermal properties and the mechanical properties of the composite are studied via the FT-IR,the torque rheometer, the differential scanning calorimetry, the thermogravimetry and the tensile testing method. The results indicate that the TPU significantly improves the processing performance of the PVB. The balance torque of the composite is 7.2 N·m, when PVB:TPU is equal to 75:25 (weight), which is decreased by 42.4% comparing to the balance torque of the pure PVB. The processing performance of the TPU/PVB composites is improved by using dibutyl phthalate (DBP) as the plasticizer. The balance torque of the composite is decreased from 7.2 N·m to 4.5 N·m when the weight fraction of the DBP is 20% and PVB:TPU is equal to 75:25 (weight). The tensile strength of the composite is decreased by 13 MPa and and its elongation is increased by 138%, compared to that without adding DBP. The melting temperature is decreased by 10℃ and the decomposition temperature is increased by 18℃, comparing to the values of the pure PVB.

The calculation of the heat flux at the stagnation point in consideration of variable specific heat for hypersonic vehicle

LUO Guangqi, HU Shendao, LI You, WU Tao, ZENG Jianchen
Science & Technology Review. 2015, 33 (22): 55-59. ;  doi: 10.3981/j.issn.1000-7857.2015.22.008
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Abstract ( 655 )
In order to design a thermal protection system for hypersonic vehicles, it is important to predict the heat transfer rate precisely. For this purpose, an effective method for calculating the heat flux at the stagnation point for hypersonic vehicles is developed. The variable specific heat of air is considered in the calculation of changes of temperature behind the shock wave, while the effect of real gas is considered in the calculation of the heat flux at the stagnation point. The air's heat capacity and the ratio of the specific heat are calculated based on the Peng-Robinson equation of state, and their fitting formula can be obtained against temperature. The typical stagnation point heat flux for a blunt body is calculated. The results are compared with the experimental data and data from the fitting formula in literature. The results show that the method is convenient and accurate. Reliable data can be provided for the aero-thermal calculation in the initial design and for the reasonable choice of the thermal protection system for hypersonic vehicles.

Improving transport performance of paste with pumping agent and optimization of mixing proportion

AI Chunming, WU Aixiang, WANG Hongjiang, YANG Xixiang, ZHOU Falu
Science & Technology Review. 2015, 33 (22): 60-64. ;  doi: 10.3981/j.issn.1000-7857.2015.22.009
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Abstract ( 593 )
Pumping agents are added in the laboratory experiments to improve the poor fluidity of the paste. The influences of five different kinds of pumping agents on the flow properties are investigated by comparing the slumps and the slump flow. The result of test shows that the pumping agent C has the greatest effect with the best adding range of 2.0%-2.5%. The fitting result of the uniform design shows that the concentration and the aggregate ratio tail are negatively correlated with the liquidity and the sand-cement ratio is positive. Based on the fitting equation, the recommended mixing proportion of the paste is derived: The concentration of 77.5%- 78.5%, the aggregate ratio of 4.5-5.5, the amount of the pumping agent of 2.0% (quality of the cement), the sand-cement ratio of 8. The results of the confirmatory experiment show that the actual requirements are met.

Pressure characteristics of shale gas fractured horizontal well

LI Yanzun, LI Xiangfang, XU Min
Science & Technology Review. 2015, 33 (22): 65-68. ;  doi: 10.3981/j.issn.1000-7857.2015.22.010
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Abstract ( 1134 )
Most shale gas reservoirs are exploited with the multi-hydraulic fracture method. In this paper, a new shale gas fractured horizontal well flow model is established which considers the effects of stimulated area's nonuniform distribution and gas desorption. With the plots of pressure and derivative curves, the stimulated area's volume and distribution characteristics are analyzed. The results demonstrate that the pressure curves are sensitive to fracturing effect. The well bottom hole pressure is lower when more areas are stimulated. The plots show that the duration of early linear flow depends on the volume of stimulated areas and their distribution, and that the fracture degree of stimulated area also affects the duration of early linear flow.

Cyclic waterflooding numerical simulation of fractured horizontal well group in low permeability reservoirs

YANG Zhengming, QU Haiyang, HE Ying, WANG Xuewu
Science & Technology Review. 2015, 33 (22): 69-72. ;  doi: 10.3981/j.issn.1000-7857.2015.22.011
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Abstract ( 969 )
Low permeability reservoirs have poor physical properties and strong heterogeneity. The conventional continuous waterflooding method can not effectively be used to inject into the formation and an effective driving energy system is difficult to establish. In order to better supplement energy in the region and further enhance the development extent of the reserve, the reservoir simulation method is used with the rectangle five point method for injection of vertical wells as the elementary unit and the production of horizontal wells as a comparative analysis of production levels of different injection styles, different injection periods,and the corresponding injection-production ratio combined with the actual field model to forecast the development efficiency. The result shows that with the working system of symmetrical cyclic waterflooding, and with the water injection well being open for a month then shut for a month, the injection-production ratio is 1.4. The formation pressure alternates smoothly with slowly rising water cut with a good efficiency of supplying the formation energy. The optimized development and production plan might provide some guidance for the oilfields.

Analysis of factors influencing additional pressure drop of fiber-assisted temporary blocking of an artificial fracture

WANG Daobing, Zhou Fujian, GE Hongkui, LU Yuan, YAN Xingming
Science & Technology Review. 2015, 33 (22): 73-77. ;  doi: 10.3981/j.issn.1000-7857.2015.22.012
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Abstract ( 1042 )
An automatically degradable fiber at reservoir temperature could be used to temporarily block artificial or natural fractures effectively. After injecting diverting clean fiber into the fracture, net pressure in the blocked fracture will be remarkably increased. Then it forces the artificial fracture to re-orientate, i.e. fractures are initiated and propagate in another direction. This stimulation technology will improve the stimulated volume of hydrocarbon reservoirs. In the blocking process, the fiber cake zone will be formed in the fracture. It will produce an additional pressure drop when hydraulic fracturing fluid is injected through the blocked fracture. It is the basis for optimizing the critical parameters of design program of fiber-assisted diverting fracturing to understand the influential factors of additional pressure drop induced by the fiber cake. Because additional pressure drop is related with many factors, it is very difficult to optimize the critical parameters of fiber-assisted diverting fracturing. In this paper, on the basis of the physical model of the blocking, the mathematical model of additional pressure drop induced by fiber cake is deduced and calculated by adopting the classical theory of hydraulic fracturing. The change rule of its influential factors is numerically simulated. The results show that low injection rate, small fracture width and high viscosity will be beneficial to increase the additional pressure drop and improve the temporary blocking effect. According to the propagation criterion of tensile fracture, the relationship between the bottom hole pressure increment and the required length of additional fiber is obtained. Excellent linearity between them is achieved.

Wind preventing fire technology in the 102 full mechanized isolated island caving face of Tianchi coal mine

ZHOU Xihua, NIE Rongshan, SONG Dongping, BAI Gang, LIU Zhenling, ZHANG Shuling
Science & Technology Review. 2015, 33 (22): 78-82. ;  doi: 10.3981/j.issn.1000-7857.2015.22.013
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Abstract ( 392 )
In order to prevent coal spontaneous combustion in goaf of the 102 fully mechanized caving island coal face located in 15# coal seam of Tianchi coal mine, the change law of oxygenation heating-up zone in goaf under different air supply volumes was studied according to the division standard of spontaneous combustion "three zones" in goaf, using the computational fluid dynamics software COMSOL. The scopes of oxygenation heating-up zone was determined,the fitting curve between air supply volume of working face and the width of oxygenation heating-up zone was obtained. The results showed that air leakage in goaf is the main reason for spontaneous combustion in goaf of U+I 102 caving face. The width of oxygenation heating-up zone increased with the increase of air supply volume of the working face. The concentration of CO in the 103 return air closed wall of goaf reduced from more than 20×10-6 at the beginning to 5×10-6 after equalizing. The field practice on the 102 fully mechanized caving island coal face showed that it is feasible to prevent spontaneous combustion of residual coal in goaf of Tianchi coal mine with the wind preventing fire technology.

Effects of hypoxia stress and level of Mn2+ on anti-oxidative system of seedlings in two resistant kiwifruit species

MI Yinfa, HUO Yujuan, CUI Ruihong
Science & Technology Review. 2015, 33 (22): 83-88. ;  doi: 10.3981/j.issn.1000-7857.2015.22.014
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Abstract ( 494 )
Low oxygen concentration is a normal natural environmental stress during kiwifruit cultivating. Under root zone of hypoxia stress, pH and reduction potential would become much lower around the plants' roots. Under this condition, Mn4 + would be deoxygenized to Mn2+, which is the form of manganese absorbed by plants in the soil. If hypoxia soil keeps the low reducing and pH conditions for a long time, Mn2+ will be accumulated to a high concentration, and Mn2+ toxicity to plants may occur. So in this paper, changes of antioxidant enzyme activities of different resistant kiwifruit seedlings (Actinidia. deliciosa var. Qinmei & Actinidia. chinensis var.Qinmei rufopulpa) are evaluated under hypoxia stress with different levels of Mn2+ . Activities of superoxide dismutase (SOD), peroxidase (POD), ascorbate peroxide (APX), glutathione reductase (GR), catalase (CAT), the contents of H2O2, ascorbic (AsA) and malondialdehyde (MDA) are studied to understand how active oxygen damages the membrane lipid under hypoxia stress. Two species' seedlings were planted in hydroponics. Nutrient solutions including different levels of Mn2+ (10, 200, 400 and 600 μmol/L) were aerated with nitrogen in order to induce root zone of hypoxia stress. Eight days later, when symptoms were obvious, antioxidant enzyme activities, contents of H2O2 and malondialdehyde (MDA) were investigated. It is concluded that the right amount of Mn2+ could reduce damages of active oxygen from hypoxia stress, however, a high level of Mn2+ is only to aggravate the damage. The two different resistant kiwifruit species have similar physiological mechanisms, but the A. deliciosa var. seedling is superior to that of A. chinensis var. rufopulpa in terms of anti-active oxygen abilities.

The mechanism of c-fos gene regulation of 17-alpha hydroxylase (CYP17) expression and testosterone production in ovarian granulosa cells from polycystic ovary syndrome patients

SANG Min, LI Jing, ZHANG Yuehui, WU Xiaoke
Science & Technology Review. 2015, 33 (22): 89-92. ;  doi: 10.3981/j.issn.1000-7857.2015.22.015
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Abstract ( 557 )
The objective of this study is to confirm the role of c-fos in the regulation of 17-alpha hydroxylase (CYP17) and androgen production in granulosa cells from Polycystic ovary syndrome (PCOS) patients. The ovarian granulosa cells from the PCOS and non- PCOS patients during IVF/ICSI–ET are isolated and divided into two groups: The PCOS group and the control group,then they are cultured in vitro for 48 h. The following techniques are then used: The radioimmunoassay to determine the level of estradiol, progesterone,testosterone; The 2-NBDG as the fluorescence probe to detect the glucose uptake in granulosa cells; And Western Blot technology to analyze the cellular expressions of c-fos, and CYP17. The results show that compared with the control group,the testosterone secretion within ovarian granulosa cells from PCOS patients is increased (P<0.05), the progesterone level is significantly lower (P<0.05), the estradiol (P>0.05) does not change significantly, and the 2-NBDG uptake in granulosa cells is lower (P<0.05), indicating that the testosterone secretion within ovarian granulosa cells from PCOS patients is significantly increased, and the glucose metabolic disorders are present in granulosa cells from PCOS patients. The Western Blot shows that CYP17 (P<0.05) has a high expression in ovarian granulosa cells from PCOS patients compared with the control group patients, and the expression of c-fos is decreased (P<0.05), indicating that the c-fos may be one of the factors responsible for the CYP17 repression, and it may be one of the reasons for the increase in the testosterone production of granulose cells.

Observation of effects of munziq and mushil therapy on asthma patients with abnormal savda syndrome

AWUTI Maliyegu, MIJITI Peierdun, AIHEMAITI Xiamixinuer, ABUDULA Abulizi, UPUR Halmurat
Science & Technology Review. 2015, 33 (22): 93-96. ;  doi: 10.3981/j.issn.1000-7857.2015.22.016
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Abstract ( 355 )
This study aims to evaluate the effects of Munziq and Mushil therapy on asthma patients with abnormal savda syndrome. During March 2012 to October 2013, 75 asthma patients with abnormal savda syndrome from Rrespiratory Department of the First Affiliated Hospital of Xinjiang Medical University were randomly assigned to the treatment group (n=38) and control group (n=37). The control group received budesonide and formoterol fumarate powder for inhalation (symbicort turbuhaler), and the treatment group received traditional Uyghur medicine combined with those for the control group; The course of treatment was one month. The day and night clinical symptoms of asthma, ACT grade and asthma quality of life questionnaire (AQLQ) grade were observed and compared. In one month, asthma was well controlled in 91.9% of patients in the control group and 94.8% of patients in the treatment group, but the difference was not significant statistically (P>0.05). Compared to the baseline, day and night symptom controlled scores and ACT scores increased in both groups, but not statistically different in one month (P>0.05). The AQLQ grades of both groups were improved after one month treatment compared to the baseline, and the mean difference was significantly different between the two groups (P<0.05). Health related quality of life subscale such as exercise endurance, mentality status, reaction to stimulation and care to own health were significantly higher in the treatment group than in the control group. Traditional Uyghur medicine combined with western medicine showed similar effects in improving in ACT grades and AQLQ grades of asthma patients when compared to use of western medicine alone. However, use of traditional Uyghur medicine can improve health related quality of life of asthma patients when combined with western medicine, which was its advantage.

Breaking the stasis of current plant systematics

WANG Xin, LIU Zhongjian, LIU Wenzhe, ZHANG Xin, GUO Xuemin, HU Guangwan, ZHANG Shouzhou, WANG Yaling, LIAO Wenbo
Science & Technology Review. 2015, 33 (22): 97-105. ;  doi: 10.3981/j.issn.1000-7857.2015.22.017
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Abstract ( 694 )
The plant systematics has been dominated by the Euanthium Theory for over hundred years. Despite all progress made, several important problems defy solutions and block further progress of botany, and one sometimes even sees conflicts among different branches and schools in botany. From the history of botany in the past centuries, it is realized that the stasis in the current plant systematics is actually a result of a blind reverence to authority and the self-restriction within the dominating theories. Any progress in the plant systematics would not be possible without dropping these burdens. A new testable hypothesis on the making of flowers is advanced in this paper.
Academic Discussion

New medicine and bacteriocentric theory and a revolution in prevention and control of chronic diseases

ZHANG Chenggang
Science & Technology Review. 2015, 33 (22): 106-111. ;  doi: 10.3981/j.issn.1000-7857.2015.22.018
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Abstract ( 483 )
Since the start of the 21st Century, the situation in the fields of prevention and control of the chronic diseases such as obesity, diabetes, hypertension, cancer, is becoming more and more serious. The research and development of new drugs is limited even along with the successful completion of the human genome project, leading to the difficulties in the medical reform in China as well as in Europe and the United States, which in turn suggests that there may be some problems in the modern medical and health care system. Based on the research progress in the world, and a large number of volunteers in our study, we have advanced the microbe-origin theory of chronic disease, which means that the chronic disease in a human body is mainly due to the disorders of human commensal microflora, and the symptoms of chronic diseases including constipation, obesity, diabetes could be significantly improved by optimizing the gastrointestinal flora. On this basis, we have proposed the microbe-origin theory of the psychological activity, which means that the human mental activity is not only closely related with the human brain, but also closely related with the gastrointestinal flora. We have then proposed a new medical theory that the human health depends on the balance between the human body and the gastrointestinal flora, while the chronic disease is due to the imbalance between the human body and the gastrointestinal flora. In most cases, the disorder of human gastrointestinal flora is caused by insufficient supply of the biologial carbon source for the microbe in colorectum because of the over uptake of the biologial carbon source by the small intestine in the body. Furthermore, it is suggested that the human body is the place designed for the growth of the microbe, and the psychological activities of the human beings are closely related with the intestinal microbiota. Based on this view, we may not only achieve a new breakthrough in the field of prevention and control of chronic diseases and health management, but also more likely achieve a new understanding of the mental activities of human being and their material basis in particular, as well as that of the human society in general.

Which estimation is more accurate? A technical comments on Nature Paper by Liu et al on overestimation of China's emission

TENG Fei, ZHU Songli
Science & Technology Review. 2015, 33 (22): 112-116. ;  doi: 10.3981/j.issn.1000-7857.2015.22.019
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Abstract ( 558 )
Liu et al report an overestimation of carbon emission from fossil fuel combustion and cement production in China. We test the robustness of their findings from various aspects on methodology, data and uncertainty. We found their findings contains serious mistakes and misunderstanding on inventory methodology and energy data. Thus casting daout on their conclusion that previous studies overestimate China's carbon emission.
Special Column of Science

Science & Technology Review. 2015, 33 (22): 117-119.
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Scientific Community Promotion

Science & Technology Review. 2015, 33 (22): 122-122.
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Book Reviews

Science & Technology Review. 2015, 33 (22): 123-123.
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Science & Technology Review. 2015, 33 (22): 125-125.
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Science & Technology Review. 2015, 33 (22): 126-126.
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Science & Technology Review. 2015, 33 (22): 127-127.
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Science & Technology Review. 2015, 33 (22): 0-.
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