Most of the traditional band-stop filters are realized by all-passive components, and there are problems such as the difficulty of adjusting the bandwidth of the stop-band and the large area of the inductor. Using TSMC 180 nm CMOS technology, this paper proposes an adjustable-bandwidth band-stop filter based on an N-path notch filter. The circuit consists of two second-order N-path notch filters and a transconductance cell. The frequency of the two channels is shifted upward and downward with respect to the total output frequency to achieve a tunable stop-band bandwidth of the filter. At 1.8 V supply voltage, using Cadence Spectre RF simulation, the results show that the filter gain is greater than -2 dB,the notch frequency is adjustable from 0.3 GHz to 1.2 GHz, the stop-band bandwidth is adjustable from 20 MHz to 48 MHz, and stop-band rejection is 12 dB. When the frequency deviation is 150 MHz, IIP3 is 9.8 dBm, F_N is 3.5 to 6.5 dB. The proposed band-stop filter not only achieves a bandwidth-tunable function, is easy to integrate with a simple circuit structure, but also improves the overall circuit performance which provides a useful solution for multi-standard, multi-frequency radio applications.

As particle swarm optimization algorithm in the optimization of wireless sensor networks is easy to fall into local optimal solution and slow late convergence as well as other shortcomings, an improved particle swarm optimization algorithm based on dynamic acceleration factor (PSO-DAC) is proposed. It adopts decreasing inertia weight coefficients and introduces dynamic acceleration coefficients. The experimental results show that the algorithm has improved the coverage ratio by 34.6% than that of the basic particle swarm algorithm, which is 29.3% higher than that of the particle swarm algorithm based on decreasing inertia weight coefficient. It is proved that the PSO-DAC algorithm can effectively increase the convergence speed and improve the coverage rate of nodes, so as to improve the coverage effect of the whole network and prolong the network lifetime.

Based on the value cognition of consumers, it is a critical approach for telecom operators to classify consumers correctly in order to know them better. Telecom operators can divide the consumers into different categories and develop different service policies as well, so that they can advance the differentiated marketing to improve business benefits. Firstly, consumers of different telecom networks are classified in detail. In order to improve the classification accuracy, this research improves the determination of learning rate and the initial value's weight vectors based on the traditional self-organizing map neural network, proposing an improved self-organizing map neural network (ISOMNN). Then this ISOMNN is applied to the simulation experiment by using the consumer data provided by a telecom operator of a province. The simulation results reveal that ISOMNN can not only take the stability into account, but also solve the slow self-organizing problem well, boosting the accuracy of consumer-classification and reducing errors significantly. Finally, based on the results of classification, this paper provides the basic principles for the telecom operators, which will help them to implement differential marketing.

The classical Lotka-Volterra model study focuses only on simple interspecific competition or simple interspecific cooperation. Due to the complexity of the real environment and the diversity of the relationship between biological populations, the interrelationship between populations is often not a single one but a mixture of multiple relationships. In this paper, a class of two-species Lotka-Volterra competition-cooperation hybrid system is established. The competitive relationship and cooperative relationship occur among the two populations, which are alternately affected by environmental impact in different time intervals. By constructing appropriate Lyapunov functions and analysis, sufficient criterion is obtained for the global asymptotic stability of the system's positivity, bounded and positive equilibrium point, then data is given for simulation to verify the conclusion. Through the study, it is found that the competition-cooperation model has more dynamic behavior than the single competition model or cooperative model, and the biological population shows more survivability, which is more consistent with the real environment.

Based on a stochastic Beddington-DeAngelis predator-prey system with Beddington-DeAngelis functional response,taking the complex coupled mode of two noise sources into account, a more complex system is investigated in this paper. Using the construction of Lyapunov functions and stopping time technique,the existence of global unique positive solution is obtained. Consequently, it is shown that the solution of the system is stochastically ultimate bounded. Finally,some sufficient conditions of stochastically global asymptotic stability are established, numerical experiments are conducted based on Matlab and Milstein method to verify the main conclusions of the stochastically global asymptotic stability.

In this paper, a class of Riemann-Liouville fractional differential equation with multiple-points boundary conditions are studied: $\left\{\begin{array}{ll} D^{a}_{0+}u(t)+f(t,u(t),u'(t))=0, \\ u(0)=u'(0)=u''(0)=\cdot\cdot\cdot =u^{n-2}(0)=0,u'(1)=\sum^{m-2}_{i=1}\beta_{i}u'(\xi_{i}), \end{array}\right.$其中0≤t≤1,n-1<a≤n, n≥2, 0<β_i<1, 0<ξ_i<1, i=1,2,\cot\cot\cot,m-2。a_i>0,$\sum^{m-2}_{i=1}$β_iξ_i^a-2<1。The existence of solution for the boundary value problem is proved by using the Schauder fixed point theorem. At least three positive solutions of the above fractional differential equation are acquired by using the Leggett-Williams fixed point theorem. An example is given to illustrate the validity of the conclusion obtained in this paper.

In this paper, the Bernstein theorem for the self-expansion solution of the Lagrangian mean curvature flow in the pseudo-European space is studied. Without loss of the generality, for a class of second order ordinary differential equations such as u″=F(u-$\frac{1}{2}$tu'),u=u(t), and under certain conditions, their solutions are investigated. If u'(0)=0, and the function F is an analytic function, it is shown that the solutions of the equations are quadratic polynomials. At the same time, the classical Bernstein theorem for the solution of a class of equations is proved by using a more concise and intuitionistic method for the first time, and then the study for the self-similarity solution of the pseudo-European space Lagrangian mean curvature is developed.

In this paper,a threshold dividend strategy risk model with phase-type claims under stochastic environment is analyzed and a novel algorithm to obtain the Laplace-stieltjes transform (LST) of the ruin time is proposed. The initial surplus of the risk process is neglected,and the risk process is transformed into a Finite Markov Fluid Queue (FMFQ) with initial level zero. Using the FMFQ theory,the LST expressions of the ruin time are obtained through the relationship between the ruin time of the risk process and the busy period of the FMFQ,and the expression of ultimate ruin probability is also presented.

The heavy metal capturing agent UDTC was used as removal of cadmium ion in the wastewater. Effects of UDTC dosage, pH value, reaction time and whether to add flocculent on the removal of Cd²⁺ ions in wastewater were investigated; and the effect of UDTC was compared with that of EDTC and Na₂S. The results show that: for wastewater containing Cd²⁺ 10 mg/L, the UDTC dosage was 40 mg/L, pH 4~9, using PAC/PAM as flocculant, reaction time was 12 min. The removal rate of Cd²⁺ from wastewater can be achieved over 99.5%; Compared with two kinds of commonly used heavy metal capture agent, the UDTC has a stronger ability to capture heavy metal and has good application prospect.

For providing the theoretical foundation and experiment evidence to further study on the polyphenols from the cake of Camellia oleifera Abel. and their pharmacological activities, two polyphenols compounds (kaempferol-3-O-[2-O-β-D-galactopyranosyl-6-O-α-L-rhamnopyranosyl] -β-D-glucopyranosie (1) and kaempferol-3-O-[2-O-β-D-xylopyranosyl-6-O-α-L-rhamnopyranosyl]-β-D-glucopyranoside (2)) from the cake of C. oleifera Abel. were obtained through degrease, ethanol extraction and prep-MPLC. MTT method was used to evaluate the cytotoxicity on RAW264.7 cell, establish cell model of LPS-induced inflammation and detect the anti-inflammatory activities of flavone glycosides compound 1, 2 and the mixture 3. The results of anti-inflammatory activity assay showed that the flavone glycosides compound 1, 2 and the mixture 3 were less toxic to RAW264.7 and both of them could significantly suppress the production of NO, iNOS, TNF-α in cells, which indicated that both of them had good anti-inflammatory effects and good prospect in drug research and development.

To study the effects of total alkaloids on apoptosis and autophagy of hepatic stellate cells in vitro.Cell inhibition rates which using different concentrations (0.20、0.25、0.30 g·L^-1) of Dehydrocavidine group, Pakistan Martin group and Berberine group to the cultured HSC-T6 cells in vitro were detected.The ultrastructural changes of each group cells were observed by transmission electron microscopy. The results showed that, the cell inhibition rates of HSC-T6 cells induced by different drugs in three groups were dependent on concentrations;the HSC-T6 cells showed typical ultrastructural changes of apoptosis after 24h’s processing with different concentrations of the drugs,and there were different levels of the autophagy.Cavitin, Martin and berberine could induce apoptosis and autophagy of the HSC-T6 cells. There three components may be effective to anti liver fibrosis in total alkaloids of the Coptis chinensis Franch.

From July to September 2012, one group of Assamese macaque (Macaca assamensis) was observed using instantaneous scan sampling in the limestone forest of the Nonggang Nature Reserve, Guangxi, China, and collected their behavior data to explore the influence of the ecological factors on their time budgets. The results showed that resting accounted for the most of their activity budget (40.9%±21.6%), followed by foraging (29.9%±19.4%), moving (19.8%±5.0%), grooming(7.1%±5.8%), playing (1.4%±2.5%), and other activity (1.1%±1.3%), respectively. Further analysis revealed that the resting time of the Assamese macaque was positively correlated with the proportion of the total immature leaves and the young bamboo leaves in their diet, and was negatively correlated with the food diversity and the proportion of the fruits in the diet. Foraging time declined when the proportion of the total immature leaves and the young bamboo leaves in the diet increased, and was positively correlated with food diversity and the proportion of the fruits in the diet. Moreover, stepwise regression analysis results indicated that the proportion of immature leaves in the diet was the predominated factor affecting the resting time of the macaque, and the proportion of fruit in the diet could be the best indicator for their foraging time. In summary, diet is the key factor influencing the Assamese macaques in the limestone forest of Guangxi, and the time activity of the macaques could be linked to the abundance and distribution pattern of the predominated food species, Bonia saxatilis, a karst-endemic bamboo.

In order to study the effects of invasive species, Eichhornia crassipes, on the population maintenance and expansion of Ottelia acuminata var. jingxiensis, seeding germination O. acuminata var. jingxiensis was measured through aqueous extracts of different concentration from leaf, petiole, flower and root of E. crassipes acuminate. The results showed that all the aqueous extracts could accelerate the seed germination, and there were some differences in promoting effects. The germination rate increased with the concentration of aqueous extracts increased, while germination index increased gradually with the rise of the concentration of leaf and flower aqueous extracts, and the maximum appeared in 100 g/L, while the maximum appearing in 20 g/L in petiole and root aqueous extracts. Then it showed a downward trend with the increase of concentration, and the germination potential also presented the same trend as germination index. However, the aqueous extracts had a little different on the sensitive indexes of seed germination rate . Therefore, aqueous extracts of E. crassipes had no obvious stress on the seed germination in this experiment, on the contrary, there was a certain role in promoting.

Hydroponic culture was conducted to study the effect of different light conditions on the growth of Isoetes sinensis. The paper examined the changing rule of physiological and biochemical characteristics and photosynthetic fluorescence characteristics. The results showed that the chlorophyll content of the leaves of I. sinensis increased and then decreased but other physiological and biochemical indexes including soluble sugar content, malondialdehyde (MDA) content, proline (PRO) content, peroxidase (POD) activities and catalase (CAT) activities gradually decreased at the beginning then increased with the decreasing light intensity. Among the photosynthetic fluorescence characteristics, the PSⅡ effective quantum yield (Yield), PSⅡ maximal quantum yield (Fv/Fm), photochemical quenching (qP), higher potential maximum relative electron transfer rates (Pm), initial slope of rapid light curve (α) and half-starved value of light intensities (Ik) gradually increased and then decreased with the decreasing light intensity, while non-photochemical quenching (qN) decreased and then increased. The suitable light intensity for physiological and photosynthesis of I. sinensis is about 70% of full light. In general,moderate shading should improve the carbon assimilation capacity of I. sinensis, stimulate the accumulation of photoproduct and beneficial in I. sinensis growth.

8 species of ferns from Hunan Province are reported for the first time: Crepidomanes schmidianum (Zenker ex Taschner) K. Iwats., Hymenophyllum longissimum (Ching & P. S. Chiu) K. Iwats., Pteris hirsutissima Ching, P. guangdongensis Ching, Aleuritopteris chrysophylla (Hook.) Ching, Acystopteris tenuisecta (Blume) Tagawa, Cornopteris christenseniana (Koidz.) Tagawa and Osmunda mildei C. Chr.. All the voucher specimens are preserved in Shanghai Chenshan Herbarium (CSH).

By adopting the method of anthropometry, the 6 items of skinfold thickness(including facial,biceps, triceps,subscapular,suprailiac and calf skinfold thickness)of 402 cases of the Yi adults(197 males and 205 females) were investigatedin Daliangshan of Sichuan.The results were shown as follows:(1)Trunk subcutaneous fat development of male was superior to that of the limbs.The skinfolds of trunk and upper limb developed better in female.(2)Six items of skinfold thickness, of female were greater than that of male,the difference was statistically significant. (3) Correlation analysis and variance analysis showed, that the thickness of back skinfold and suprailiac skinfold was positively correlated with age in male,but with no statistically significant within age groups.The skinfold thickness of triceps and biceps of female was positively correlated with age, but with no statistically significant within age groups. (4)Compared of 8 ethnic groups in China, the skinfold thickness of male and female of Daliangshan is close to that of southwest minorities.Conclusion can be reached that: the characteristics of skin folds of Yi had the characteristics of southwest minorities. The skinfold thickness was comparatively thin, and body was slim.

The Tertiary red-bed, widely spread in the downstream of Qingjiang River, is composed of sandstone with mudstone, shale,and the bottom of conglomaerate. The thickness is more than 300 meters, some degree of karst development, one of which karst caves has the development value. To further grasp the red layer of groundwater quality change trend, 30 groups of samples were taken from the red beds area groundwater, using descriptive analysis, correlation analysis and other statistical methods, the hydrochemical characteristics of groundwater are summarized.The results showed that the groundwater type in the red zone was mainly based on HCO₃-Ca or HCO₃-Ca·Mg, and the groundwater chemical composition had obvious spatial variability. Two points Al exceeds the standard value of the groundwater V quality(500 μg/L), which should be taken seriously to prevent water pollution. The Sr content of 19 water points exceeds the limit of natural drinking mineral water(200 μg/L), which suggests the evaluation of strontium mineral water.

The cropland loss has an important impact on food security, social stability and economic development. The ecological environment in mining area is fragile, and grasping the spatial and temporal characteristics of cropland loss can provide a reference for guiding the agricultural development and restoring the ecological environment. Four phases (1986, 1994, 2006 and 2015) of TM and OLI images as main data sources are used to analyze, the spatial and temporal characteristics of cropland loss by using the change rate of individual land type area, importance index and landscape index. The following results are obtained. During the period of 1986-1994, the cultivated land was reduced by 2%, and the cultivated land to the construction land was widely distributed. During the period of 1994-2006, the cultivated land was reduced by 6.9%, and the cultivated land to industrial and mining land was the dominant type of spatial change.During the period of 2006-2015, the cultivated land was reduced by 13.7%. The spatial distribution of cultivated land to grassland was wider, but the cultivated land to industrial and mining land was the dominant type of spatial change. The landscape pattern of cultivated land has remarkable interannual variability, and the degree of landscape fragmentation is increasing, and landscape shapes become more and more complex. The policy of grain for green, the construction of urban and rural areas and the exploitation of coal are the main influencing factors of cropland loss. This research is significant for the protection and sustainable utilization of cultivated land resources in Xuangang mining area.

Based on the land use data of 2005, 2010 and 2015 in Tianjin Binhai New Area, this paper quantitatively analyzes the change of land use in the study area by using the dynamic degree model. The CA-Markov model is used to predict the future land use pattern of the study area, and the simulation data of 2015 and the actual interpretation data in 2015 are verified. According to the extended kappa index, the consistency between the two layers is high, indicating that the simulation accuracy is better. And then the land use pattern in 2025 was simulated and predicted, the results are as follows: compared with the period from 2005 to 2015, the land use types in the study area during the 2015-2025 period are mainly based on the waters, urban and rural mining and residential land and cultivated land. The area of urban and rural industrial and mining residents will continue to expand on the basis of the original, the area of water will continue to increase, the area of woodland, grassland and unused land will continue to decrease, the area of cultivated land will continue to decrease significantly, and land use change is larger. This indicates that the future land use pressure of the study area will be further increased, which indicates that relevant response should be done in advance. This study provides the relevant basis for the future land use planning of Tianjin Binhai New Area.

In order to reveal the spatial pattern of economic relations of city tourism and put forward the construction of tourism urban agglomeration in West River economic belt of Guangxi, the West River economic belt of Guangxi is taken as the research subject in this paper and the rectified tourism economic relation modelis used to examine and analyze the economic tourism linkages and the spatial structure of seven central cities in Guangxi in 2015. It is concluded that taking the tie intensity of tourism economy as a standard, the most intense tie with tourism economy in central cities along West River economic belt of Guangxi is characterized by the spatial interconnection, especially the Nanning and Liuzhou, which almost enable them to enjoy a status of “dual core of tourism” in the spatial structure. Spatial interconnection in the intensive region is mainly centered upon districts, such as Nanning, Liuzhou, Guigang and Laibin. Influenced by the radiation intensity in the higher-level tourism economy and the capacity of self-acceptancethe economic ties in tourism of the central cities with the core cities, and those adjacent to the central cities are more frequent, due to their own weak radiation of tourism economy in the surrounding central cities together with the decline of the accessibility, the intensity of economic ties in tourism between tertiary central cities and the central cities is on the fall by gradual. According to the above comprehensive analysis, it is pointed out that all cities should make use of their own advantages to form complementary advantages with the core ones, to forge three tourism urban agglomerations like “Nanning-Guigang-Liuzhou” and “Nanning-Baise-Chongzuo” led by Nanning and “Liuzhou-Laibin-Guigang” led by Liuzhou, and to form mutual compensation, mutual coordination of regional tourism development plate.